mxfdec.c 144 KB
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/*
 * MXF demuxer.
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 * Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>
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 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/*
 * References
 * SMPTE 336M KLV Data Encoding Protocol Using Key-Length-Value
 * SMPTE 377M MXF File Format Specifications
 * SMPTE 378M Operational Pattern 1a
 * SMPTE 379M MXF Generic Container
 * SMPTE 381M Mapping MPEG Streams into the MXF Generic Container
 * SMPTE 382M Mapping AES3 and Broadcast Wave Audio into the MXF Generic Container
 * SMPTE 383M Mapping DV-DIF Data to the MXF Generic Container
 *
 * Principle
 * Search for Track numbers which will identify essence element KLV packets.
 * Search for SourcePackage which define tracks which contains Track numbers.
 * Material Package contains tracks with reference to SourcePackage tracks.
 * Search for Descriptors (Picture, Sound) which contains codec info and parameters.
 * Assign Descriptors to correct Tracks.
 *
 * Metadata reading functions read Local Tags, get InstanceUID(0x3C0A) then add MetaDataSet to MXFContext.
 * Metadata parsing resolves Strong References to objects.
 *
 * Simple demuxer, only OP1A supported and some files might not work at all.
 * Only tracks with associated descriptors will be decoded. "Highly Desirable" SMPTE 377M D.1
 */

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#include <inttypes.h>
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#include "libavutil/aes.h"
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#include "libavutil/avassert.h"
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#include "libavutil/mathematics.h"
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#include "libavcodec/bytestream.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/timecode.h"
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#include "libavutil/opt.h"
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#include "avformat.h"
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#include "internal.h"
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#include "mxf.h"
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#define MXF_MAX_CHUNK_SIZE (32 << 20)

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typedef enum {
    Header,
    BodyPartition,
    Footer
} MXFPartitionType;

typedef enum {
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    OP1a = 1,
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    OP1b,
    OP1c,
    OP2a,
    OP2b,
    OP2c,
    OP3a,
    OP3b,
    OP3c,
    OPAtom,
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    OPSONYOpt,  /* FATE sample, violates the spec in places */
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} MXFOP;

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typedef enum {
    UnknownWrapped = 0,
    FrameWrapped,
    ClipWrapped,
} MXFWrappingScheme;

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typedef struct MXFPartition {
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    int closed;
    int complete;
    MXFPartitionType type;
    uint64_t previous_partition;
    int index_sid;
    int body_sid;
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    int64_t this_partition;
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    int64_t essence_offset;         ///< absolute offset of essence
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    int64_t essence_length;
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    int32_t kag_size;
    int64_t header_byte_count;
    int64_t index_byte_count;
    int pack_length;
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    int64_t pack_ofs;               ///< absolute offset of pack in file, including run-in
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    int64_t body_offset;
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    KLVPacket first_essence_klv;
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} MXFPartition;

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typedef struct MXFCryptoContext {
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    UID uid;
    enum MXFMetadataSetType type;
    UID source_container_ul;
} MXFCryptoContext;

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typedef struct MXFStructuralComponent {
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    UID uid;
    enum MXFMetadataSetType type;
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    UID source_package_ul;
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    UID source_package_uid;
    UID data_definition_ul;
    int64_t duration;
    int64_t start_position;
    int source_track_id;
} MXFStructuralComponent;

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typedef struct MXFSequence {
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    UID uid;
    enum MXFMetadataSetType type;
    UID data_definition_ul;
    UID *structural_components_refs;
    int structural_components_count;
    int64_t duration;
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    uint8_t origin;
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} MXFSequence;

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typedef struct MXFTimecodeComponent {
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    UID uid;
    enum MXFMetadataSetType type;
    int drop_frame;
    int start_frame;
    struct AVRational rate;
    AVTimecode tc;
} MXFTimecodeComponent;

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typedef struct {
    UID uid;
    enum MXFMetadataSetType type;
    UID input_segment_ref;
} MXFPulldownComponent;

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typedef struct {
    UID uid;
    enum MXFMetadataSetType type;
    UID *structural_components_refs;
    int structural_components_count;
    int64_t duration;
} MXFEssenceGroup;

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typedef struct {
    UID uid;
    enum MXFMetadataSetType type;
    char *name;
    char *value;
} MXFTaggedValue;

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typedef struct {
    UID uid;
    enum MXFMetadataSetType type;
    MXFSequence *sequence; /* mandatory, and only one */
    UID sequence_ref;
    int track_id;
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    char *name;
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    uint8_t track_number[4];
    AVRational edit_rate;
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    int intra_only;
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    uint64_t sample_count;
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    int64_t original_duration; /* st->duration in SampleRate/EditRate units */
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    int index_sid;
    int body_sid;
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    MXFWrappingScheme wrapping;
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    int edit_units_per_packet; /* how many edit units to read at a time (PCM, ClipWrapped) */
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} MXFTrack;

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typedef struct MXFDescriptor {
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    UID uid;
    enum MXFMetadataSetType type;
    UID essence_container_ul;
    UID essence_codec_ul;
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    UID codec_ul;
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    AVRational sample_rate;
    AVRational aspect_ratio;
    int width;
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    int height; /* Field height, not frame height */
    int frame_layout; /* See MXFFrameLayout enum */
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    int video_line_map[2];
#define MXF_FIELD_DOMINANCE_DEFAULT 0
#define MXF_FIELD_DOMINANCE_FF 1 /* coded first, displayed first */
#define MXF_FIELD_DOMINANCE_FL 2 /* coded first, displayed last */
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    int field_dominance;
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    int channels;
    int bits_per_sample;
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    int64_t duration; /* ContainerDuration optional property */
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    unsigned int component_depth;
    unsigned int horiz_subsampling;
    unsigned int vert_subsampling;
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    UID *sub_descriptors_refs;
    int sub_descriptors_count;
    int linked_track_id;
    uint8_t *extradata;
    int extradata_size;
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    enum AVPixelFormat pix_fmt;
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} MXFDescriptor;

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typedef struct MXFIndexTableSegment {
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    UID uid;
    enum MXFMetadataSetType type;
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    int edit_unit_byte_count;
    int index_sid;
    int body_sid;
    AVRational index_edit_rate;
    uint64_t index_start_position;
    uint64_t index_duration;
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    int8_t *temporal_offset_entries;
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    int *flag_entries;
    uint64_t *stream_offset_entries;
    int nb_index_entries;
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} MXFIndexTableSegment;

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typedef struct MXFPackage {
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    UID uid;
    enum MXFMetadataSetType type;
    UID package_uid;
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    UID package_ul;
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    UID *tracks_refs;
    int tracks_count;
    MXFDescriptor *descriptor; /* only one */
    UID descriptor_ref;
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    char *name;
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    UID *comment_refs;
    int comment_count;
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} MXFPackage;

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typedef struct MXFEssenceContainerData {
    UID uid;
    enum MXFMetadataSetType type;
    UID package_uid;
    UID package_ul;
    int index_sid;
    int body_sid;
} MXFEssenceContainerData;

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typedef struct MXFMetadataSet {
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    UID uid;
    enum MXFMetadataSetType type;
} MXFMetadataSet;

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/* decoded index table */
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typedef struct MXFIndexTable {
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    int index_sid;
    int body_sid;
    int nb_ptses;               /* number of PTSes or total duration of index */
    int64_t first_dts;          /* DTS = EditUnit + first_dts */
    int64_t *ptses;             /* maps EditUnit -> PTS */
    int nb_segments;
    MXFIndexTableSegment **segments;    /* sorted by IndexStartPosition */
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    AVIndexEntry *fake_index;   /* used for calling ff_index_search_timestamp() */
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    int8_t *offsets;            /* temporal offsets for display order to stored order conversion */
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} MXFIndexTable;

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typedef struct MXFContext {
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    const AVClass *class;     /**< Class for private options. */
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    MXFPartition *partitions;
    unsigned partitions_count;
    MXFOP op;
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    UID *packages_refs;
    int packages_count;
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    UID *essence_container_data_refs;
    int essence_container_data_count;
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    MXFMetadataSet **metadata_sets;
    int metadata_sets_count;
    AVFormatContext *fc;
    struct AVAES *aesc;
    uint8_t *local_tags;
    int local_tags_count;
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    uint64_t footer_partition;
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    KLVPacket current_klv_data;
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    int run_in;
    MXFPartition *current_partition;
    int parsing_backward;
    int64_t last_forward_tell;
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    int last_forward_partition;
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    int nb_index_tables;
    MXFIndexTable *index_tables;
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    int eia608_extract;
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} MXFContext;

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/* NOTE: klv_offset is not set (-1) for local keys */
typedef int MXFMetadataReadFunc(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset);
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typedef struct MXFMetadataReadTableEntry {
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    const UID key;
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    MXFMetadataReadFunc *read;
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    int ctx_size;
    enum MXFMetadataSetType type;
} MXFMetadataReadTableEntry;

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static int mxf_read_close(AVFormatContext *s);

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/* partial keys to match */
static const uint8_t mxf_header_partition_pack_key[]       = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02 };
static const uint8_t mxf_essence_element_key[]             = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01 };
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static const uint8_t mxf_avid_essence_element_key[]        = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0e,0x04,0x03,0x01 };
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static const uint8_t mxf_canopus_essence_element_key[]     = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x0a,0x0e,0x0f,0x03,0x01 };
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static const uint8_t mxf_system_item_key_cp[]              = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x03,0x01,0x04 };
static const uint8_t mxf_system_item_key_gc[]              = { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x03,0x01,0x14 };
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static const uint8_t mxf_klv_key[]                         = { 0x06,0x0e,0x2b,0x34 };
/* complete keys to match */
static const uint8_t mxf_crypto_source_container_ul[]      = { 0x06,0x0e,0x2b,0x34,0x01,0x01,0x01,0x09,0x06,0x01,0x01,0x02,0x02,0x00,0x00,0x00 };
static const uint8_t mxf_encrypted_triplet_key[]           = { 0x06,0x0e,0x2b,0x34,0x02,0x04,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x7e,0x01,0x00 };
static const uint8_t mxf_encrypted_essence_container[]     = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x0b,0x01,0x00 };
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static const uint8_t mxf_random_index_pack_key[]           = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x11,0x01,0x00 };
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static const uint8_t mxf_sony_mpeg4_extradata[]            = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0e,0x06,0x06,0x02,0x02,0x01,0x00,0x00 };
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static const uint8_t mxf_avid_project_name[]               = { 0xa5,0xfb,0x7b,0x25,0xf6,0x15,0x94,0xb9,0x62,0xfc,0x37,0x17,0x49,0x2d,0x42,0xbf };
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static const uint8_t mxf_jp2k_rsiz[]                       = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x01,0x00 };
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static const uint8_t mxf_indirect_value_utf16le[]          = { 0x4c,0x00,0x02,0x10,0x01,0x00,0x00,0x00,0x00,0x06,0x0e,0x2b,0x34,0x01,0x04,0x01,0x01 };
static const uint8_t mxf_indirect_value_utf16be[]          = { 0x42,0x01,0x10,0x02,0x00,0x00,0x00,0x00,0x00,0x06,0x0e,0x2b,0x34,0x01,0x04,0x01,0x01 };
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#define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y)))

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static void mxf_free_metadataset(MXFMetadataSet **ctx, int freectx)
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{
    MXFIndexTableSegment *seg;
    switch ((*ctx)->type) {
    case Descriptor:
        av_freep(&((MXFDescriptor *)*ctx)->extradata);
        break;
    case MultipleDescriptor:
        av_freep(&((MXFDescriptor *)*ctx)->sub_descriptors_refs);
        break;
    case Sequence:
        av_freep(&((MXFSequence *)*ctx)->structural_components_refs);
        break;
    case EssenceGroup:
        av_freep(&((MXFEssenceGroup *)*ctx)->structural_components_refs);
        break;
    case SourcePackage:
    case MaterialPackage:
        av_freep(&((MXFPackage *)*ctx)->tracks_refs);
        av_freep(&((MXFPackage *)*ctx)->name);
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        av_freep(&((MXFPackage *)*ctx)->comment_refs);
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        break;
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    case TaggedValue:
        av_freep(&((MXFTaggedValue *)*ctx)->name);
        av_freep(&((MXFTaggedValue *)*ctx)->value);
        break;
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    case Track:
        av_freep(&((MXFTrack *)*ctx)->name);
        break;
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    case IndexTableSegment:
        seg = (MXFIndexTableSegment *)*ctx;
        av_freep(&seg->temporal_offset_entries);
        av_freep(&seg->flag_entries);
        av_freep(&seg->stream_offset_entries);
    default:
        break;
    }
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    if (freectx)
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    av_freep(ctx);
}

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static int64_t klv_decode_ber_length(AVIOContext *pb)
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{
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    uint64_t size = avio_r8(pb);
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    if (size & 0x80) { /* long form */
        int bytes_num = size & 0x7f;
        /* SMPTE 379M 5.3.4 guarantee that bytes_num must not exceed 8 bytes */
        if (bytes_num > 8)
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            return AVERROR_INVALIDDATA;
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        size = 0;
        while (bytes_num--)
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            size = size << 8 | avio_r8(pb);
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    }
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    if (size > INT64_MAX)
        return AVERROR_INVALIDDATA;
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    return size;
}

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static int mxf_read_sync(AVIOContext *pb, const uint8_t *key, unsigned size)
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{
    int i, b;
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    for (i = 0; i < size && !avio_feof(pb); i++) {
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        b = avio_r8(pb);
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        if (b == key[0])
            i = 0;
        else if (b != key[i])
            i = -1;
    }
    return i == size;
}

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static int klv_read_packet(KLVPacket *klv, AVIOContext *pb)
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{
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    int64_t length, pos;
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    if (!mxf_read_sync(pb, mxf_klv_key, 4))
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        return AVERROR_INVALIDDATA;
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    klv->offset = avio_tell(pb) - 4;
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    memcpy(klv->key, mxf_klv_key, 4);
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    avio_read(pb, klv->key + 4, 12);
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    length = klv_decode_ber_length(pb);
    if (length < 0)
        return length;
    klv->length = length;
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    pos = avio_tell(pb);
    if (pos > INT64_MAX - length)
        return AVERROR_INVALIDDATA;
    klv->next_klv = pos + length;
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    return 0;
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}

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static int mxf_get_stream_index(AVFormatContext *s, KLVPacket *klv, int body_sid)
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{
    int i;

    for (i = 0; i < s->nb_streams; i++) {
        MXFTrack *track = s->streams[i]->priv_data;
        /* SMPTE 379M 7.3 */
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        if (track && (!body_sid || !track->body_sid || track->body_sid == body_sid) && !memcmp(klv->key + sizeof(mxf_essence_element_key), track->track_number, sizeof(track->track_number)))
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            return i;
    }
    /* return 0 if only one stream, for OP Atom files with 0 as track number */
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    return s->nb_streams == 1 && s->streams[0]->priv_data ? 0 : -1;
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}

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static int find_body_sid_by_absolute_offset(MXFContext *mxf, int64_t offset)
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{
    // we look for partition where the offset is placed
    int a, b, m;
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    int64_t pack_ofs;
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    a = -1;
    b = mxf->partitions_count;

    while (b - a > 1) {
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        m = (a + b) >> 1;
        pack_ofs = mxf->partitions[m].pack_ofs;
        if (pack_ofs <= offset)
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            a = m;
        else
            b = m;
    }

    if (a == -1)
        return 0;
    return mxf->partitions[a].body_sid;
}

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static int mxf_get_eia608_packet(AVFormatContext *s, AVStream *st, AVPacket *pkt, int64_t length)
{
    int count = avio_rb16(s->pb);
    int cdp_identifier, cdp_length, cdp_footer_id, ccdata_id, cc_count;
    int line_num, sample_coding, sample_count;
    int did, sdid, data_length;
    int i, ret;

    if (count != 1)
        av_log(s, AV_LOG_WARNING, "unsupported multiple ANC packets (%d) per KLV packet\n", count);

    for (i = 0; i < count; i++) {
        if (length < 6) {
            av_log(s, AV_LOG_ERROR, "error reading s436m packet %"PRId64"\n", length);
            return AVERROR_INVALIDDATA;
        }
        line_num = avio_rb16(s->pb);
        avio_r8(s->pb); // wrapping type
        sample_coding = avio_r8(s->pb);
        sample_count = avio_rb16(s->pb);
        length -= 6 + 8 + sample_count;
        if (line_num != 9 && line_num != 11)
            continue;
        if (sample_coding == 7 || sample_coding == 8 || sample_coding == 9) {
            av_log(s, AV_LOG_WARNING, "unsupported s436m 10 bit sample coding\n");
            continue;
        }
        if (length < 0)
            return AVERROR_INVALIDDATA;

        avio_rb32(s->pb); // array count
        avio_rb32(s->pb); // array elem size
        did = avio_r8(s->pb);
        sdid = avio_r8(s->pb);
        data_length = avio_r8(s->pb);
        if (did != 0x61 || sdid != 1) {
            av_log(s, AV_LOG_WARNING, "unsupported did or sdid: %x %x\n", did, sdid);
            continue;
        }
        cdp_identifier = avio_rb16(s->pb); // cdp id
        if (cdp_identifier != 0x9669) {
            av_log(s, AV_LOG_ERROR, "wrong cdp identifier %x\n", cdp_identifier);
            return AVERROR_INVALIDDATA;
        }
        cdp_length = avio_r8(s->pb);
        avio_r8(s->pb); // cdp_frame_rate
        avio_r8(s->pb); // cdp_flags
        avio_rb16(s->pb); // cdp_hdr_sequence_cntr
        ccdata_id = avio_r8(s->pb); // ccdata_id
        if (ccdata_id != 0x72) {
            av_log(s, AV_LOG_ERROR, "wrong cdp data section %x\n", ccdata_id);
            return AVERROR_INVALIDDATA;
        }
        cc_count = avio_r8(s->pb) & 0x1f;
        ret = av_get_packet(s->pb, pkt, cc_count * 3);
        if (ret < 0)
            return ret;
        if (cdp_length - 9 - 4 <  cc_count * 3) {
            av_log(s, AV_LOG_ERROR, "wrong cdp size %d cc count %d\n", cdp_length, cc_count);
            return AVERROR_INVALIDDATA;
        }
        avio_skip(s->pb, data_length - 9 - 4 - cc_count * 3);
        cdp_footer_id = avio_r8(s->pb);
        if (cdp_footer_id != 0x74) {
            av_log(s, AV_LOG_ERROR, "wrong cdp footer section %x\n", cdp_footer_id);
            return AVERROR_INVALIDDATA;
        }
        avio_rb16(s->pb); // cdp_ftr_sequence_cntr
        avio_r8(s->pb); // packet_checksum
        break;
    }

    return 0;
}

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/* XXX: use AVBitStreamFilter */
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static int mxf_get_d10_aes3_packet(AVIOContext *pb, AVStream *st, AVPacket *pkt, int64_t length)
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{
    const uint8_t *buf_ptr, *end_ptr;
    uint8_t *data_ptr;
    int i;

    if (length > 61444) /* worst case PAL 1920 samples 8 channels */
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        return AVERROR_INVALIDDATA;
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    length = av_get_packet(pb, pkt, length);
    if (length < 0)
        return length;
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    data_ptr = pkt->data;
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    end_ptr = pkt->data + length;
    buf_ptr = pkt->data + 4; /* skip SMPTE 331M header */
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    for (; end_ptr - buf_ptr >= st->codecpar->channels * 4; ) {
        for (i = 0; i < st->codecpar->channels; i++) {
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            uint32_t sample = bytestream_get_le32(&buf_ptr);
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            if (st->codecpar->bits_per_coded_sample == 24)
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                bytestream_put_le24(&data_ptr, (sample >> 4) & 0xffffff);
            else
                bytestream_put_le16(&data_ptr, (sample >> 12) & 0xffff);
        }
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        buf_ptr += 32 - st->codecpar->channels*4; // always 8 channels stored SMPTE 331M
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    }
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    av_shrink_packet(pkt, data_ptr - pkt->data);
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    return 0;
}

static int mxf_decrypt_triplet(AVFormatContext *s, AVPacket *pkt, KLVPacket *klv)
{
    static const uint8_t checkv[16] = {0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b};
    MXFContext *mxf = s->priv_data;
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    AVIOContext *pb = s->pb;
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    int64_t end = avio_tell(pb) + klv->length;
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    int64_t size;
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    uint64_t orig_size;
    uint64_t plaintext_size;
    uint8_t ivec[16];
    uint8_t tmpbuf[16];
    int index;
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    int body_sid;
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    if (!mxf->aesc && s->key && s->keylen == 16) {
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        mxf->aesc = av_aes_alloc();
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        if (!mxf->aesc)
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            return AVERROR(ENOMEM);
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        av_aes_init(mxf->aesc, s->key, 128, 1);
    }
    // crypto context
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    size = klv_decode_ber_length(pb);
    if (size < 0)
        return size;
    avio_skip(pb, size);
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    // plaintext offset
    klv_decode_ber_length(pb);
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    plaintext_size = avio_rb64(pb);
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    // source klv key
    klv_decode_ber_length(pb);
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    avio_read(pb, klv->key, 16);
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    if (!IS_KLV_KEY(klv, mxf_essence_element_key))
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        return AVERROR_INVALIDDATA;
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    body_sid = find_body_sid_by_absolute_offset(mxf, klv->offset);
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    index = mxf_get_stream_index(s, klv, body_sid);
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    if (index < 0)
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        return AVERROR_INVALIDDATA;
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    // source size
    klv_decode_ber_length(pb);
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    orig_size = avio_rb64(pb);
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    if (orig_size < plaintext_size)
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        return AVERROR_INVALIDDATA;
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    // enc. code
    size = klv_decode_ber_length(pb);
    if (size < 32 || size - 32 < orig_size)
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        return AVERROR_INVALIDDATA;
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    avio_read(pb, ivec, 16);
    avio_read(pb, tmpbuf, 16);
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    if (mxf->aesc)
        av_aes_crypt(mxf->aesc, tmpbuf, tmpbuf, 1, ivec, 1);
    if (memcmp(tmpbuf, checkv, 16))
        av_log(s, AV_LOG_ERROR, "probably incorrect decryption key\n");
    size -= 32;
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    size = av_get_packet(pb, pkt, size);
    if (size < 0)
        return size;
    else if (size < plaintext_size)
        return AVERROR_INVALIDDATA;
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    size -= plaintext_size;
    if (mxf->aesc)
        av_aes_crypt(mxf->aesc, &pkt->data[plaintext_size],
                     &pkt->data[plaintext_size], size >> 4, ivec, 1);
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    av_shrink_packet(pkt, orig_size);
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    pkt->stream_index = index;
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    avio_skip(pb, end - avio_tell(pb));
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    return 0;
}

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static int mxf_read_primer_pack(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
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{
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    MXFContext *mxf = arg;
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    int item_num = avio_rb32(pb);
    int item_len = avio_rb32(pb);
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    if (item_len != 18) {
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        avpriv_request_sample(pb, "Primer pack item length %d", item_len);
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        return AVERROR_PATCHWELCOME;
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    }
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    if (item_num > 65536 || item_num < 0) {
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        av_log(mxf->fc, AV_LOG_ERROR, "item_num %d is too large\n", item_num);
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        return AVERROR_INVALIDDATA;
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    }
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    if (mxf->local_tags)
        av_log(mxf->fc, AV_LOG_VERBOSE, "Multiple primer packs\n");
    av_free(mxf->local_tags);
    mxf->local_tags_count = 0;
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    mxf->local_tags = av_calloc(item_num, item_len);
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    if (!mxf->local_tags)
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        return AVERROR(ENOMEM);
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    mxf->local_tags_count = item_num;
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    avio_read(pb, mxf->local_tags, item_num*item_len);
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    return 0;
}

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static int mxf_read_partition_pack(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
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{
    MXFContext *mxf = arg;
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    AVFormatContext *s = mxf->fc;
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    MXFPartition *partition, *tmp_part;
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    UID op;
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    uint64_t footer_partition;
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    uint32_t nb_essence_containers;
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    if (mxf->partitions_count >= INT_MAX / 2)
        return AVERROR_INVALIDDATA;

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    tmp_part = av_realloc_array(mxf->partitions, mxf->partitions_count + 1, sizeof(*mxf->partitions));
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    if (!tmp_part)
        return AVERROR(ENOMEM);
    mxf->partitions = tmp_part;
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    if (mxf->parsing_backward) {
        /* insert the new partition pack in the middle
         * this makes the entries in mxf->partitions sorted by offset */
        memmove(&mxf->partitions[mxf->last_forward_partition+1],
                &mxf->partitions[mxf->last_forward_partition],
                (mxf->partitions_count - mxf->last_forward_partition)*sizeof(*mxf->partitions));
        partition = mxf->current_partition = &mxf->partitions[mxf->last_forward_partition];
    } else {
        mxf->last_forward_partition++;
        partition = mxf->current_partition = &mxf->partitions[mxf->partitions_count];
    }

    memset(partition, 0, sizeof(*partition));
    mxf->partitions_count++;
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    partition->pack_length = avio_tell(pb) - klv_offset + size;
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    partition->pack_ofs    = klv_offset;
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    switch(uid[13]) {
    case 2:
        partition->type = Header;
        break;
    case 3:
        partition->type = BodyPartition;
        break;
    case 4:
        partition->type = Footer;
        break;
    default:
        av_log(mxf->fc, AV_LOG_ERROR, "unknown partition type %i\n", uid[13]);
        return AVERROR_INVALIDDATA;
    }

    /* consider both footers to be closed (there is only Footer and CompleteFooter) */
    partition->closed = partition->type == Footer || !(uid[14] & 1);
    partition->complete = uid[14] > 2;
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    avio_skip(pb, 4);
    partition->kag_size = avio_rb32(pb);
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    partition->this_partition = avio_rb64(pb);
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    partition->previous_partition = avio_rb64(pb);
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    footer_partition = avio_rb64(pb);
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    partition->header_byte_count = avio_rb64(pb);
    partition->index_byte_count = avio_rb64(pb);
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    partition->index_sid = avio_rb32(pb);
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    partition->body_offset = avio_rb64(pb);
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    partition->body_sid = avio_rb32(pb);
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    if (avio_read(pb, op, sizeof(UID)) != sizeof(UID)) {
        av_log(mxf->fc, AV_LOG_ERROR, "Failed reading UID\n");
        return AVERROR_INVALIDDATA;
    }
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    nb_essence_containers = avio_rb32(pb);
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    if (partition->type == Header) {
        char str[36];
        snprintf(str, sizeof(str), "%08x.%08x.%08x.%08x", AV_RB32(&op[0]), AV_RB32(&op[4]), AV_RB32(&op[8]), AV_RB32(&op[12]));
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        av_dict_set(&s->metadata, "operational_pattern_ul", str, 0);
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    }

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    if (partition->this_partition &&
        partition->previous_partition == partition->this_partition) {
        av_log(mxf->fc, AV_LOG_ERROR,
               "PreviousPartition equal to ThisPartition %"PRIx64"\n",
               partition->previous_partition);
        /* override with the actual previous partition offset */
        if (!mxf->parsing_backward && mxf->last_forward_partition > 1) {
            MXFPartition *prev =
                mxf->partitions + mxf->last_forward_partition - 2;
            partition->previous_partition = prev->this_partition;
        }
        /* if no previous body partition are found point to the header
         * partition */
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        if (partition->previous_partition == partition->this_partition)
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            partition->previous_partition = 0;
        av_log(mxf->fc, AV_LOG_ERROR,
               "Overriding PreviousPartition with %"PRIx64"\n",
               partition->previous_partition);
    }

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    /* some files don't have FooterPartition set in every partition */
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    if (footer_partition) {
        if (mxf->footer_partition && mxf->footer_partition != footer_partition) {
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            av_log(mxf->fc, AV_LOG_ERROR,
                   "inconsistent FooterPartition value: %"PRIu64" != %"PRIu64"\n",
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                   mxf->footer_partition, footer_partition);
        } else {
            mxf->footer_partition = footer_partition;
        }
    }

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    av_log(mxf->fc, AV_LOG_TRACE,
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            "PartitionPack: ThisPartition = 0x%"PRIX64
            ", PreviousPartition = 0x%"PRIX64", "
            "FooterPartition = 0x%"PRIX64", IndexSID = %i, BodySID = %i\n",
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            partition->this_partition,
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            partition->previous_partition, footer_partition,
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            partition->index_sid, partition->body_sid);

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    /* sanity check PreviousPartition if set */
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    //NOTE: this isn't actually enough, see mxf_seek_to_previous_partition()
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    if (partition->previous_partition &&
        mxf->run_in + partition->previous_partition >= klv_offset) {
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        av_log(mxf->fc, AV_LOG_ERROR,
               "PreviousPartition points to this partition or forward\n");
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        return AVERROR_INVALIDDATA;
    }

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    if      (op[12] == 1 && op[13] == 1) mxf->op = OP1a;
    else if (op[12] == 1 && op[13] == 2) mxf->op = OP1b;
    else if (op[12] == 1 && op[13] == 3) mxf->op = OP1c;
    else if (op[12] == 2 && op[13] == 1) mxf->op = OP2a;
    else if (op[12] == 2 && op[13] == 2) mxf->op = OP2b;
    else if (op[12] == 2 && op[13] == 3) mxf->op = OP2c;
    else if (op[12] == 3 && op[13] == 1) mxf->op = OP3a;
    else if (op[12] == 3 && op[13] == 2) mxf->op = OP3b;
    else if (op[12] == 3 && op[13] == 3) mxf->op = OP3c;
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    else if (op[12] == 64&& op[13] == 1) mxf->op = OPSONYOpt;
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    else if (op[12] == 0x10) {
        /* SMPTE 390m: "There shall be exactly one essence container"
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         * The following block deals with files that violate this, namely:
         * 2011_DCPTEST_24FPS.V.mxf - two ECs, OP1a
         * abcdefghiv016f56415e.mxf - zero ECs, OPAtom, output by Avid AirSpeed */
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        if (nb_essence_containers != 1) {
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            MXFOP op = nb_essence_containers ? OP1a : OPAtom;

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            /* only nag once */
            if (!mxf->op)
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                av_log(mxf->fc, AV_LOG_WARNING,
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                       "\"OPAtom\" with %"PRIu32" ECs - assuming %s\n",
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                       nb_essence_containers,
                       op == OP1a ? "OP1a" : "OPAtom");
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            mxf->op = op;
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        } else
            mxf->op = OPAtom;
    } else {
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        av_log(mxf->fc, AV_LOG_ERROR, "unknown operational pattern: %02xh %02xh - guessing OP1a\n", op[12], op[13]);
        mxf->op = OP1a;
    }

    if (partition->kag_size <= 0 || partition->kag_size > (1 << 20)) {
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        av_log(mxf->fc, AV_LOG_WARNING, "invalid KAGSize %"PRId32" - guessing ",
               partition->kag_size);
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        if (mxf->op == OPSONYOpt)
            partition->kag_size = 512;
        else
            partition->kag_size = 1;

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        av_log(mxf->fc, AV_LOG_WARNING, "%"PRId32"\n", partition->kag_size);
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    }
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    return 0;
}

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static int mxf_add_metadata_set(MXFContext *mxf, void *metadata_set)
{
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    MXFMetadataSet **tmp;
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    tmp = av_realloc_array(mxf->metadata_sets, mxf->metadata_sets_count + 1, sizeof(*mxf->metadata_sets));
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    if (!tmp)
        return AVERROR(ENOMEM);
    mxf->metadata_sets = tmp;
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    mxf->metadata_sets[mxf->metadata_sets_count] = metadata_set;
    mxf->metadata_sets_count++;
    return 0;
}

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static int mxf_read_cryptographic_context(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
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{
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    MXFCryptoContext *cryptocontext = arg;
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    if (size != 16)
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        return AVERROR_INVALIDDATA;
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    if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))
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        avio_read(pb, cryptocontext->source_container_ul, 16);
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    return 0;
}

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static int mxf_read_strong_ref_array(AVIOContext *pb, UID **refs, int *count)
{
    *count = avio_rb32(pb);
    *refs = av_calloc(*count, sizeof(UID));
    if (!*refs) {
        *count = 0;
        return AVERROR(ENOMEM);
    }
    avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */
    avio_read(pb, (uint8_t *)*refs, *count * sizeof(UID));
    return 0;
}

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static inline int mxf_read_utf16_string(AVIOContext *pb, int size, char** str, int be)
{
    int ret;
    size_t buf_size;

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    if (size < 0 || size > INT_MAX/2)
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        return AVERROR(EINVAL);

    buf_size = size + size / 2 + 1;
    *str = av_malloc(buf_size);
    if (!*str)
        return AVERROR(ENOMEM);

    if (be)
        ret = avio_get_str16be(pb, size, *str, buf_size);
    else
        ret = avio_get_str16le(pb, size, *str, buf_size);

    if (ret < 0) {
        av_freep(str);
        return ret;
    }

    return ret;
}

#define READ_STR16(type, big_endian)                                               \
static int mxf_read_utf16 ## type ##_string(AVIOContext *pb, int size, char** str) \
{                                                                                  \
return mxf_read_utf16_string(pb, size, str, big_endian);                           \
}
READ_STR16(be, 1)
READ_STR16(le, 0)
#undef READ_STR16

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static int mxf_read_content_storage(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
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{
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    MXFContext *mxf = arg;
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    switch (tag) {
    case 0x1901:
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        if (mxf->packages_refs)
            av_log(mxf->fc, AV_LOG_VERBOSE, "Multiple packages_refs\n");
        av_free(mxf->packages_refs);
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        return mxf_read_strong_ref_array(pb, &mxf->packages_refs, &mxf->packages_count);
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    case 0x1902:
        av_free(mxf->essence_container_data_refs);
        return mxf_read_strong_ref_array(pb, &mxf->essence_container_data_refs, &mxf->essence_container_data_count);
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    }
    return 0;
}

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static int mxf_read_source_clip(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
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{
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    MXFStructuralComponent *source_clip = arg;
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    switch(tag) {
    case 0x0202:
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        source_clip->duration = avio_rb64(pb);
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        break;
    case 0x1201:
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        source_clip->start_position = avio_rb64(pb);
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        break;
    case 0x1101:
        /* UMID, only get last 16 bytes */
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        avio_read(pb, source_clip->source_package_ul, 16);
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        avio_read(pb, source_clip->source_package_uid, 16);
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        break;
    case 0x1102:
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        source_clip->source_track_id = avio_rb32(pb);
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        break;
    }
    return 0;
}

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static int mxf_read_timecode_component(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
{
    MXFTimecodeComponent *mxf_timecode = arg;
    switch(tag) {
    case 0x1501:
        mxf_timecode->start_frame = avio_rb64(pb);
        break;
    case 0x1502:
        mxf_timecode->rate = (AVRational){avio_rb16(pb), 1};
        break;
    case 0x1503:
        mxf_timecode->drop_frame = avio_r8(pb);
        break;
    }
    return 0;
}

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static int mxf_read_pulldown_component(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
{
    MXFPulldownComponent *mxf_pulldown = arg;
    switch(tag) {
    case 0x0d01:
        avio_read(pb, mxf_pulldown->input_segment_ref, 16);
        break;
    }
    return 0;
}

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static int mxf_read_track(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
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{
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    MXFTrack *track = arg;
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    switch(tag) {
    case 0x4801:
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        track->track_id = avio_rb32(pb);
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        break;
    case 0x4804:
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        avio_read(pb, track->track_number, 4);
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        break;
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    case 0x4802:
        mxf_read_utf16be_string(pb, size, &track->name);
        break;
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    case 0x4b01:
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        track->edit_rate.num = avio_rb32(pb);
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        track->edit_rate.den = avio_rb32(pb);
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        break;
    case 0x4803:
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        avio_read(pb, track->sequence_ref, 16);
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        break;
    }
    return 0;
}

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static int mxf_read_sequence(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
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{
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    MXFSequence *sequence = arg;
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    switch(tag) {
    case 0x0202:
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        sequence->duration = avio_rb64(pb);
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        break;
    case 0x0201:
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        avio_read(pb, sequence->data_definition_ul, 16);
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        break;
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        case 0x4b02:
        sequence->origin = avio_r8(pb);
        break;
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    case 0x1001:
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        return mxf_read_strong_ref_array(pb, &sequence->structural_components_refs,
                                             &sequence->structural_components_count);
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    }
    return 0;
}

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static int mxf_read_essence_group(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
{
    MXFEssenceGroup *essence_group = arg;
    switch (tag) {
    case 0x0202:
        essence_group->duration = avio_rb64(pb);
        break;
    case 0x0501:
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        return mxf_read_strong_ref_array(pb, &essence_group->structural_components_refs,
                                             &essence_group->structural_components_count);
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    }
    return 0;
}

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static int mxf_read_package(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
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{
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    MXFPackage *package = arg;
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    switch(tag) {
    case 0x4403:
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        return mxf_read_strong_ref_array(pb, &package->tracks_refs,
                                             &package->tracks_count);
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    case 0x4401:
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        /* UMID */
        avio_read(pb, package->package_ul, 16);
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        avio_read(pb, package->package_uid, 16);
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        break;
    case 0x4701:
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        avio_read(pb, package->descriptor_ref, 16);
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        break;
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    case 0x4402:
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        return mxf_read_utf16be_string(pb, size, &package->name);
    case 0x4406:
        return mxf_read_strong_ref_array(pb, &package->comment_refs,
                                             &package->comment_count);
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    }
    return 0;
}

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static int mxf_read_essence_container_data(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
{
    MXFEssenceContainerData *essence_data = arg;
    switch(tag) {
        case 0x2701:
            /* linked package umid UMID */
            avio_read(pb, essence_data->package_ul, 16);
            avio_read(pb, essence_data->package_uid, 16);
            break;
        case 0x3f06:
            essence_data->index_sid = avio_rb32(pb);
            break;
        case 0x3f07:
            essence_data->body_sid = avio_rb32(pb);
            break;
    }
    return 0;
}

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static int mxf_read_index_entry_array(AVIOContext *pb, MXFIndexTableSegment *segment)
{
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    int i, length;
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    segment->nb_index_entries = avio_rb32(pb);
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    length = avio_rb32(pb);
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    if(segment->nb_index_entries && length < 11)
        return AVERROR_INVALIDDATA;
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    if (!(segment->temporal_offset_entries=av_calloc(segment->nb_index_entries, sizeof(*segment->temporal_offset_entries))) ||
        !(segment->flag_entries          = av_calloc(segment->nb_index_entries, sizeof(*segment->flag_entries))) ||
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        !(segment->stream_offset_entries = av_calloc(segment->nb_index_entries, sizeof(*segment->stream_offset_entries)))) {
        av_freep(&segment->temporal_offset_entries);
        av_freep(&segment->flag_entries);
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        return AVERROR(ENOMEM);
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    }
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    for (i = 0; i < segment->nb_index_entries; i++) {
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        if(avio_feof(pb))
            return AVERROR_INVALIDDATA;
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        segment->temporal_offset_entries[i] = avio_r8(pb);
        avio_r8(pb);                                        /* KeyFrameOffset */
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        segment->flag_entries[i] = avio_r8(pb);
        segment->stream_offset_entries[i] = avio_rb64(pb);
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        avio_skip(pb, length - 11);
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    }
    return 0;
}

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static int mxf_read_index_table_segment(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
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{
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    MXFIndexTableSegment *segment = arg;
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    switch(tag) {
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    case 0x3F05:
        segment->edit_unit_byte_count = avio_rb32(pb);
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        av_log(NULL, AV_LOG_TRACE, "EditUnitByteCount %d\n", segment->edit_unit_byte_count);
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        break;
    case 0x3F06:
        segment->index_sid = avio_rb32(pb);
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        av_log(NULL, AV_LOG_TRACE, "IndexSID %d\n", segment->index_sid);
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        break;
    case 0x3F07:
        segment->body_sid = avio_rb32(pb);
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        av_log(NULL, AV_LOG_TRACE, "BodySID %d\n", segment->body_sid);
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        break;
    case 0x3F0A:
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        av_log(NULL, AV_LOG_TRACE, "IndexEntryArray found\n");
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        return mxf_read_index_entry_array(pb, segment);
    case 0x3F0B:
        segment->index_edit_rate.num = avio_rb32(pb);
        segment->index_edit_rate.den = avio_rb32(pb);
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        av_log(NULL, AV_LOG_TRACE, "IndexEditRate %d/%d\n", segment->index_edit_rate.num,
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                segment->index_edit_rate.den);
        break;
    case 0x3F0C:
        segment->index_start_position = avio_rb64(pb);
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        av_log(NULL, AV_LOG_TRACE, "IndexStartPosition %"PRId64"\n", segment->index_start_position);
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        break;
    case 0x3F0D:
        segment->index_duration = avio_rb64(pb);
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        av_log(NULL, AV_LOG_TRACE, "IndexDuration %"PRId64"\n", segment->index_duration);
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        break;
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    }
    return 0;
}

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static void mxf_read_pixel_layout(AVIOContext *pb, MXFDescriptor *descriptor)
1130
{
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    int code, value, ofs = 0;
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    char layout[16] = {0}; /* not for printing, may end up not terminated on purpose */
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    do {
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        code = avio_r8(pb);
        value = avio_r8(pb);
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        av_log(NULL, AV_LOG_TRACE, "pixel layout: code %#x\n", code);
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        if (ofs <= 14) {
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            layout[ofs++] = code;
            layout[ofs++] = value;
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        } else
            break;  /* don't read byte by byte on sneaky files filled with lots of non-zeroes */
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    } while (code != 0); /* SMPTE 377M E.2.46 */
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    ff_mxf_decode_pixel_layout(layout, &descriptor->pix_fmt);
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}

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static int mxf_read_generic_descriptor(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
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{
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    MXFDescriptor *descriptor = arg;
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    int entry_count, entry_size;

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    switch(tag) {
    case 0x3F01:
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        return mxf_read_strong_ref_array(pb, &descriptor->sub_descriptors_refs,
                                             &descriptor->sub_descriptors_count);
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    case 0x3002: /* ContainerDuration */
        descriptor->duration = avio_rb64(pb);
        break;
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    case 0x3004:
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        avio_read(pb, descriptor->essence_container_ul, 16);
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        break;
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    case 0x3005:
        avio_read(pb, descriptor->codec_ul, 16);
        break;
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    case 0x3006:
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        descriptor->linked_track_id = avio_rb32(pb);
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        break;
    case 0x3201: /* PictureEssenceCoding */
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        avio_read(pb, descriptor->essence_codec_ul, 16);
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        break;
    case 0x3203:
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        descriptor->width = avio_rb32(pb);
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        break;
    case 0x3202:
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        descriptor->height = avio_rb32(pb);
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        break;
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    case 0x320C:
        descriptor->frame_layout = avio_r8(pb);
        break;
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    case 0x320D:
        entry_count = avio_rb32(pb);
        entry_size = avio_rb32(pb);
        if (entry_size == 4) {
            if (entry_count > 0)
                descriptor->video_line_map[0] = avio_rb32(pb);
            else
                descriptor->video_line_map[0] = 0;
            if (entry_count > 1)
                descriptor->video_line_map[1] = avio_rb32(pb);
            else
                descriptor->video_line_map[1] = 0;
        } else
            av_log(NULL, AV_LOG_WARNING, "VideoLineMap element size %d currently not supported\n", entry_size);
        break;
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    case 0x320E:
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        descriptor->aspect_ratio.num = avio_rb32(pb);
        descriptor->aspect_ratio.den = avio_rb32(pb);
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        break;
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    case 0x3212:
        descriptor->field_dominance = avio_r8(pb);
        break;
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    case 0x3301:
        descriptor->component_depth = avio_rb32(pb);
        break;
    case 0x3302:
        descriptor->horiz_subsampling = avio_rb32(pb);
        break;
    case 0x3308:
        descriptor->vert_subsampling = avio_rb32(pb);
        break;
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    case 0x3D03:
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        descriptor->sample_rate.num = avio_rb32(pb);
        descriptor->sample_rate.den = avio_rb32(pb);
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        break;
    case 0x3D06: /* SoundEssenceCompression */
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        avio_read(pb, descriptor->essence_codec_ul, 16);
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        break;
    case 0x3D07:
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        descriptor->channels = avio_rb32(pb);
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        break;
    case 0x3D01:
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        descriptor->bits_per_sample = avio_rb32(pb);
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        break;
    case 0x3401:
        mxf_read_pixel_layout(pb, descriptor);
        break;
    default:
        /* Private uid used by SONY C0023S01.mxf */
        if (IS_KLV_KEY(uid, mxf_sony_mpeg4_extradata)) {
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            if (descriptor->extradata)
                av_log(NULL, AV_LOG_WARNING, "Duplicate sony_mpeg4_extradata\n");
            av_free(descriptor->extradata);
            descriptor->extradata_size = 0;
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            descriptor->extradata = av_malloc(size);
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            if (!descriptor->extradata)
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                return AVERROR(ENOMEM);
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            descriptor->extradata_size = size;
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            avio_read(pb, descriptor->extradata, size);
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        }
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        if (IS_KLV_KEY(uid, mxf_jp2k_rsiz)) {
            uint32_t rsiz = avio_rb16(pb);
            if (rsiz == FF_PROFILE_JPEG2000_DCINEMA_2K ||
                rsiz == FF_PROFILE_JPEG2000_DCINEMA_4K)
                descriptor->pix_fmt = AV_PIX_FMT_XYZ12;
        }
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        break;
    }
    return 0;
}

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static int mxf_read_indirect_value(void *arg, AVIOContext *pb, int size)
{
    MXFTaggedValue *tagged_value = arg;
    uint8_t key[17];

    if (size <= 17)
        return 0;

    avio_read(pb, key, 17);
    /* TODO: handle other types of of indirect values */
    if (memcmp(key, mxf_indirect_value_utf16le, 17) == 0) {
        return mxf_read_utf16le_string(pb, size - 17, &tagged_value->value);
    } else if (memcmp(key, mxf_indirect_value_utf16be, 17) == 0) {
        return mxf_read_utf16be_string(pb, size - 17, &tagged_value->value);
    }
    return 0;
}

static int mxf_read_tagged_value(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
{
    MXFTaggedValue *tagged_value = arg;
    switch (tag){
    case 0x5001:
        return mxf_read_utf16be_string(pb, size, &tagged_value->name);
    case 0x5003:
        return mxf_read_indirect_value(tagged_value, pb, size);
    }
    return 0;
}

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/*
 * Match an uid independently of the version byte and up to len common bytes
 * Returns: boolean
 */
static int mxf_match_uid(const UID key, const UID uid, int len)
{
    int i;
    for (i = 0; i < len; i++) {
        if (i != 7 && key[i] != uid[i])
            return 0;
    }
    return 1;
}

static const MXFCodecUL *mxf_get_codec_ul(const MXFCodecUL *uls, UID *uid)
{
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    while (uls->uid[0]) {
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        if(mxf_match_uid(uls->uid, *uid, uls->matching_len))
            break;
        uls++;
    }
    return uls;
}

static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref, enum MXFMetadataSetType type)
{
    int i;

    if (!strong_ref)
        return NULL;
    for (i = 0; i < mxf->metadata_sets_count; i++) {
        if (!memcmp(*strong_ref, mxf->metadata_sets[i]->uid, 16) &&
            (type == AnyType || mxf->metadata_sets[i]->type == type)) {
            return mxf->metadata_sets[i];
        }
    }
    return NULL;
}

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static const MXFCodecUL mxf_picture_essence_container_uls[] = {
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    // video essence container uls
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    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x0c,0x01,0x00 }, 14,   AV_CODEC_ID_JPEG2000, NULL, 14 },
    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x02,0x0d,0x01,0x03,0x01,0x02,0x10,0x60,0x01 }, 14,       AV_CODEC_ID_H264, NULL, 15 }, /* H.264 */
    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x02,0x0d,0x01,0x03,0x01,0x02,0x11,0x01,0x00 }, 14,      AV_CODEC_ID_DNXHD, NULL, 14 }, /* VC-3 */
    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x02,0x0d,0x01,0x03,0x01,0x02,0x12,0x01,0x00 }, 14,        AV_CODEC_ID_VC1, NULL, 14 }, /* VC-1 */
    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x02,0x0d,0x01,0x03,0x01,0x02,0x14,0x01,0x00 }, 14,       AV_CODEC_ID_TIFF, NULL, 14 }, /* TIFF */
    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x02,0x0d,0x01,0x03,0x01,0x02,0x15,0x01,0x00 }, 14,      AV_CODEC_ID_DIRAC, NULL, 14 }, /* VC-2 */
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    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x02,0x0d,0x01,0x03,0x01,0x02,0x1b,0x01,0x00 }, 14,       AV_CODEC_ID_CFHD, NULL, 14 }, /* VC-5 */
    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x02,0x0d,0x01,0x03,0x01,0x02,0x1c,0x01,0x00 }, 14,     AV_CODEC_ID_PRORES, NULL, 14 }, /* ProRes */
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    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x02,0x0d,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, AV_CODEC_ID_MPEG2VIDEO, NULL, 15 }, /* MPEG-ES */
    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0d,0x01,0x03,0x01,0x02,0x01,0x04,0x01 }, 14, AV_CODEC_ID_MPEG2VIDEO, NULL, 15, D10D11Wrap }, /* SMPTE D-10 mapping */
    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0d,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    AV_CODEC_ID_DVVIDEO, NULL, 15 }, /* DV 625 25mbps */
    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0d,0x01,0x03,0x01,0x02,0x05,0x00,0x00 }, 14,   AV_CODEC_ID_RAWVIDEO, NULL, 15, RawVWrap }, /* uncompressed picture */
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    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x0a,0x0e,0x0f,0x03,0x01,0x02,0x20,0x01,0x01 }, 15,     AV_CODEC_ID_HQ_HQA },
    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x0a,0x0e,0x0f,0x03,0x01,0x02,0x20,0x02,0x01 }, 15,        AV_CODEC_ID_HQX },
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    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x0a,0x0e,0x15,0x00,0x04,0x02,0x10,0x00,0x01 }, 16,       AV_CODEC_ID_HEVC, NULL, 15 }, /* Canon XF-HEVC */
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    { { 0x06,0x0e,0x2b,0x34,0x01,0x01,0x01,0xff,0x4b,0x46,0x41,0x41,0x00,0x0d,0x4d,0x4f }, 14,   AV_CODEC_ID_RAWVIDEO }, /* Legacy ?? Uncompressed Picture */
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    { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      AV_CODEC_ID_NONE },
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};
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/* EC ULs for intra-only formats */
static const MXFCodecUL mxf_intra_only_essence_container_uls[] = {
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    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0d,0x01,0x03,0x01,0x02,0x01,0x00,0x00 }, 14, AV_CODEC_ID_MPEG2VIDEO }, /* MXF-GC SMPTE D-10 mappings */
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    { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       AV_CODEC_ID_NONE },
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};

/* intra-only PictureEssenceCoding ULs, where no corresponding EC UL exists */
static const MXFCodecUL mxf_intra_only_picture_essence_coding_uls[] = {
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    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x01,0x32,0x00,0x00 }, 14,       AV_CODEC_ID_H264 }, /* H.264/MPEG-4 AVC Intra Profiles */
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    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 }, 14,   AV_CODEC_ID_JPEG2000 }, /* JPEG 2000 code stream */
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    { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       AV_CODEC_ID_NONE },
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};

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/* actual coded width for AVC-Intra to allow selecting correct SPS/PPS */
static const MXFCodecUL mxf_intra_only_picture_coded_width[] = {
    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x01,0x32,0x21,0x01 }, 16, 1440 },
    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x01,0x32,0x21,0x02 }, 16, 1440 },
    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x01,0x32,0x21,0x03 }, 16, 1440 },
    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x0A,0x04,0x01,0x02,0x02,0x01,0x32,0x21,0x04 }, 16, 1440 },
    { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,    0 },
};

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static const MXFCodecUL mxf_sound_essence_container_uls[] = {
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    // sound essence container uls
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    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0d,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, AV_CODEC_ID_PCM_S16LE, NULL, 14, RawAWrap }, /* BWF */
    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x02,0x0d,0x01,0x03,0x01,0x02,0x04,0x40,0x01 }, 14,       AV_CODEC_ID_MP2, NULL, 15 }, /* MPEG-ES */
    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0d,0x01,0x03,0x01,0x02,0x01,0x01,0x01 }, 14, AV_CODEC_ID_PCM_S16LE, NULL, 13 }, /* D-10 Mapping 50Mbps PAL Extended Template */
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    { { 0x06,0x0e,0x2b,0x34,0x01,0x01,0x01,0xff,0x4b,0x46,0x41,0x41,0x00,0x0d,0x4d,0x4F }, 14, AV_CODEC_ID_PCM_S16LE }, /* 0001GL00.MXF.A1.mxf_opatom.mxf */
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    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x03,0x04,0x02,0x02,0x02,0x03,0x03,0x01,0x00 }, 14,       AV_CODEC_ID_AAC }, /* MPEG-2 AAC ADTS (legacy) */
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    { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      AV_CODEC_ID_NONE },
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};

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static const MXFCodecUL mxf_data_essence_container_uls[] = {
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    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x09,0x0d,0x01,0x03,0x01,0x02,0x0d,0x00,0x00 }, 16, AV_CODEC_ID_NONE,      "vbi_smpte_436M", 11 },
    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x09,0x0d,0x01,0x03,0x01,0x02,0x0e,0x00,0x00 }, 16, AV_CODEC_ID_NONE, "vbi_vanc_smpte_436M", 11 },
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    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x09,0x0d,0x01,0x03,0x01,0x02,0x13,0x01,0x01 }, 16, AV_CODEC_ID_TTML },
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    { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0, AV_CODEC_ID_NONE },
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};

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static MXFWrappingScheme mxf_get_wrapping_kind(UID *essence_container_ul)
{
    int val;
    const MXFCodecUL *codec_ul;

    codec_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, essence_container_ul);
    if (!codec_ul->uid[0])
        codec_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, essence_container_ul);
    if (!codec_ul->uid[0])
        codec_ul = mxf_get_codec_ul(mxf_data_essence_container_uls, essence_container_ul);
    if (!codec_ul->uid[0] || !codec_ul->wrapping_indicator_pos)
        return UnknownWrapped;

    val = (*essence_container_ul)[codec_ul->wrapping_indicator_pos];
    switch (codec_ul->wrapping_indicator_type) {
        case RawVWrap:
            val = val % 4;
            break;
        case RawAWrap:
            if (val == 0x03 || val == 0x04)
                val -= 0x02;
            break;
        case D10D11Wrap:
            if (val == 0x02)
                val = 0x01;
            break;
    }
    if (val == 0x01)
        return FrameWrapped;
    if (val == 0x02)
        return ClipWrapped;
    return UnknownWrapped;
}

1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426
static int mxf_get_sorted_table_segments(MXFContext *mxf, int *nb_sorted_segments, MXFIndexTableSegment ***sorted_segments)
{
    int i, j, nb_segments = 0;
    MXFIndexTableSegment **unsorted_segments;
    int last_body_sid = -1, last_index_sid = -1, last_index_start = -1;

    /* count number of segments, allocate arrays and copy unsorted segments */
    for (i = 0; i < mxf->metadata_sets_count; i++)
        if (mxf->metadata_sets[i]->type == IndexTableSegment)
            nb_segments++;

1427 1428 1429
    if (!nb_segments)
        return AVERROR_INVALIDDATA;

1430 1431
    if (!(unsorted_segments = av_calloc(nb_segments, sizeof(*unsorted_segments))) ||
        !(*sorted_segments  = av_calloc(nb_segments, sizeof(**sorted_segments)))) {
1432
        av_freep(sorted_segments);
1433 1434 1435 1436
        av_free(unsorted_segments);
        return AVERROR(ENOMEM);
    }

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    for (i = nb_segments = 0; i < mxf->metadata_sets_count; i++) {
        if (mxf->metadata_sets[i]->type == IndexTableSegment) {
            MXFIndexTableSegment *s = (MXFIndexTableSegment*)mxf->metadata_sets[i];
            if (s->edit_unit_byte_count || s->nb_index_entries)
                unsorted_segments[nb_segments++] = s;
            else
                av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i segment at %"PRId64" missing EditUnitByteCount and IndexEntryArray\n",
                       s->index_sid, s->index_start_position);
        }
    }

    if (!nb_segments) {
        av_freep(sorted_segments);
        av_free(unsorted_segments);
        return AVERROR_INVALIDDATA;
    }
1453 1454 1455 1456 1457 1458

    *nb_sorted_segments = 0;

    /* sort segments by {BodySID, IndexSID, IndexStartPosition}, remove duplicates while we're at it */
    for (i = 0; i < nb_segments; i++) {
        int best = -1, best_body_sid = -1, best_index_sid = -1, best_index_start = -1;
1459
        uint64_t best_index_duration = 0;
1460 1461 1462 1463 1464 1465

        for (j = 0; j < nb_segments; j++) {
            MXFIndexTableSegment *s = unsorted_segments[j];

            /* Require larger BosySID, IndexSID or IndexStartPosition then the previous entry. This removes duplicates.
             * We want the smallest values for the keys than what we currently have, unless this is the first such entry this time around.
1466
             * If we come across an entry with the same IndexStartPosition but larger IndexDuration, then we'll prefer it over the one we currently have.
1467
             */
1468 1469 1470 1471 1472 1473 1474 1475 1476
            if ((i == 0 ||
                 s->body_sid >  last_body_sid ||
                 s->body_sid == last_body_sid && s->index_sid >  last_index_sid ||
                 s->body_sid == last_body_sid && s->index_sid == last_index_sid && s->index_start_position > last_index_start) &&
                (best == -1 ||
                 s->body_sid <  best_body_sid ||
                 s->body_sid == best_body_sid && s->index_sid <  best_index_sid ||
                 s->body_sid == best_body_sid && s->index_sid == best_index_sid && s->index_start_position <  best_index_start ||
                 s->body_sid == best_body_sid && s->index_sid == best_index_sid && s->index_start_position == best_index_start && s->index_duration > best_index_duration)) {
1477 1478 1479 1480
                best             = j;
                best_body_sid    = s->body_sid;
                best_index_sid   = s->index_sid;
                best_index_start = s->index_start_position;
1481
                best_index_duration = s->index_duration;
1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499
            }
        }

        /* no suitable entry found -> we're done */
        if (best == -1)
            break;

        (*sorted_segments)[(*nb_sorted_segments)++] = unsorted_segments[best];
        last_body_sid    = best_body_sid;
        last_index_sid   = best_index_sid;
        last_index_start = best_index_start;
    }

    av_free(unsorted_segments);

    return 0;
}

1500 1501 1502
/**
 * Computes the absolute file offset of the given essence container offset
 */
1503
static int mxf_absolute_bodysid_offset(MXFContext *mxf, int body_sid, int64_t offset, int64_t *offset_out, MXFPartition **partition_out)
1504
{
1505
    MXFPartition *last_p = NULL;
1506
    int a, b, m, m0;
1507 1508 1509

    if (offset < 0)
        return AVERROR(EINVAL);
1510

1511 1512
    a = -1;
    b = mxf->partitions_count;
1513

1514 1515
    while (b - a > 1) {
        m0 = m = (a + b) >> 1;
1516

1517 1518
        while (m < b && mxf->partitions[m].body_sid != body_sid)
            m++;
1519

1520 1521 1522 1523
        if (m < b && mxf->partitions[m].body_offset <= offset)
            a = m;
        else
            b = m0;
1524
    }
1525

1526 1527 1528
    if (a >= 0)
        last_p = &mxf->partitions[a];

1529 1530
    if (last_p && (!last_p->essence_length || last_p->essence_length > (offset - last_p->body_offset))) {
        *offset_out = last_p->essence_offset + (offset - last_p->body_offset);
1531 1532
        if (partition_out)
            *partition_out = last_p;
1533
        return 0;
1534 1535
    }

1536 1537
    av_log(mxf->fc, AV_LOG_ERROR,
           "failed to find absolute offset of %"PRIX64" in BodySID %i - partial file?\n",
1538
           offset, body_sid);
1539 1540 1541 1542

    return AVERROR_INVALIDDATA;
}

1543 1544 1545 1546 1547
/**
 * Returns the end position of the essence container with given BodySID, or zero if unknown
 */
static int64_t mxf_essence_container_end(MXFContext *mxf, int body_sid)
{
1548
    for (int x = mxf->partitions_count - 1; x >= 0; x--) {
1549 1550 1551 1552 1553 1554 1555 1556
        MXFPartition *p = &mxf->partitions[x];

        if (p->body_sid != body_sid)
            continue;

        if (!p->essence_length)
            return 0;

1557
        return p->essence_offset + p->essence_length;
1558 1559
    }

1560
    return 0;
1561 1562
}

1563
/* EditUnit -> absolute offset */
1564
static int mxf_edit_unit_absolute_offset(MXFContext *mxf, MXFIndexTable *index_table, int64_t edit_unit, AVRational edit_rate, int64_t *edit_unit_out, int64_t *offset_out, MXFPartition **partition_out, int nag)
1565 1566
{
    int i;
1567
    int64_t offset_temp = 0;
1568

1569 1570
    edit_unit = av_rescale_q(edit_unit, index_table->segments[0]->index_edit_rate, edit_rate);

1571 1572 1573 1574 1575 1576 1577 1578 1579 1580
    for (i = 0; i < index_table->nb_segments; i++) {
        MXFIndexTableSegment *s = index_table->segments[i];

        edit_unit = FFMAX(edit_unit, s->index_start_position);  /* clamp if trying to seek before start */

        if (edit_unit < s->index_start_position + s->index_duration) {
            int64_t index = edit_unit - s->index_start_position;

            if (s->edit_unit_byte_count)
                offset_temp += s->edit_unit_byte_count * index;
1581
            else {
1582 1583 1584
                if (s->nb_index_entries == 2 * s->index_duration + 1)
                    index *= 2;     /* Avid index */

1585
                if (index < 0 || index >= s->nb_index_entries) {
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                    av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" IndexEntryArray too small\n",
                           index_table->index_sid, s->index_start_position);
                    return AVERROR_INVALIDDATA;
                }

                offset_temp = s->stream_offset_entries[index];
            }

            if (edit_unit_out)
1595
                *edit_unit_out = av_rescale_q(edit_unit, edit_rate, s->index_edit_rate);
1596

1597
            return mxf_absolute_bodysid_offset(mxf, index_table->body_sid, offset_temp, offset_out, partition_out);
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        } else {
            /* EditUnitByteCount == 0 for VBR indexes, which is fine since they use explicit StreamOffsets */
            offset_temp += s->edit_unit_byte_count * s->index_duration;
        }
    }

    if (nag)
        av_log(mxf->fc, AV_LOG_ERROR, "failed to map EditUnit %"PRId64" in IndexSID %i to an offset\n", edit_unit, index_table->index_sid);

    return AVERROR_INVALIDDATA;
}

1610
static int mxf_compute_ptses_fake_index(MXFContext *mxf, MXFIndexTable *index_table)
1611
{
1612
    int i, j, x;
1613
    int8_t max_temporal_offset = -128;
1614
    uint8_t *flags;
1615 1616

    /* first compute how many entries we have */
1617 1618
    for (i = 0; i < index_table->nb_segments; i++) {
        MXFIndexTableSegment *s = index_table->segments[i];
1619

1620 1621
        if (!s->nb_index_entries) {
            index_table->nb_ptses = 0;
1622
            return 0;                               /* no TemporalOffsets */
1623
        }
1624

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        if (s->index_duration > INT_MAX - index_table->nb_ptses) {
            index_table->nb_ptses = 0;
            av_log(mxf->fc, AV_LOG_ERROR, "ignoring IndexSID %d, duration is too large\n", s->index_sid);
            return 0;
        }

1631
        index_table->nb_ptses += s->index_duration;
1632 1633 1634
    }

    /* paranoid check */
1635
    if (index_table->nb_ptses <= 0)
1636 1637
        return 0;

1638
    if (!(index_table->ptses      = av_calloc(index_table->nb_ptses, sizeof(int64_t))) ||
1639 1640 1641
        !(index_table->fake_index = av_calloc(index_table->nb_ptses, sizeof(AVIndexEntry))) ||
        !(index_table->offsets    = av_calloc(index_table->nb_ptses, sizeof(int8_t))) ||
        !(flags                   = av_calloc(index_table->nb_ptses, sizeof(uint8_t)))) {
1642
        av_freep(&index_table->ptses);
1643 1644
        av_freep(&index_table->fake_index);
        av_freep(&index_table->offsets);
1645
        return AVERROR(ENOMEM);
1646
    }
1647 1648 1649

    /* we may have a few bad TemporalOffsets
     * make sure the corresponding PTSes don't have the bogus value 0 */
1650 1651
    for (x = 0; x < index_table->nb_ptses; x++)
        index_table->ptses[x] = AV_NOPTS_VALUE;
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    /**
     * We have this:
     *
     * x  TemporalOffset
     * 0:  0
     * 1:  1
     * 2:  1
     * 3: -2
     * 4:  1
     * 5:  1
     * 6: -2
     *
     * We want to transform it into this:
     *
     * x  DTS PTS
     * 0: -1   0
     * 1:  0   3
     * 2:  1   1
     * 3:  2   2
     * 4:  3   6
     * 5:  4   4
     * 6:  5   5
     *
     * We do this by bucket sorting x by x+TemporalOffset[x] into mxf->ptses,
     * then settings mxf->first_dts = -max(TemporalOffset[x]).
     * The latter makes DTS <= PTS.
     */
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    for (i = x = 0; i < index_table->nb_segments; i++) {
        MXFIndexTableSegment *s = index_table->segments[i];
1682
        int index_delta = 1;
1683
        int n = s->nb_index_entries;
1684

1685
        if (s->nb_index_entries == 2 * s->index_duration + 1) {
1686
            index_delta = 2;    /* Avid index */
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            /* ignore the last entry - it's the size of the essence container */
            n--;
        }

        for (j = 0; j < n; j += index_delta, x++) {
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            int offset = s->temporal_offset_entries[j] / index_delta;
            int index  = x + offset;

1695
            if (x >= index_table->nb_ptses) {
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                av_log(mxf->fc, AV_LOG_ERROR,
                       "x >= nb_ptses - IndexEntryCount %i < IndexDuration %"PRId64"?\n",
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                       s->nb_index_entries, s->index_duration);
                break;
            }

1702
            flags[x] = !(s->flag_entries[j] & 0x30) ? AVINDEX_KEYFRAME : 0;
1703 1704

            if (index < 0 || index >= index_table->nb_ptses) {
1705 1706 1707 1708 1709 1710
                av_log(mxf->fc, AV_LOG_ERROR,
                       "index entry %i + TemporalOffset %i = %i, which is out of bounds\n",
                       x, offset, index);
                continue;
            }

1711
            index_table->offsets[x] = offset;
1712
            index_table->ptses[index] = x;
1713 1714 1715 1716
            max_temporal_offset = FFMAX(max_temporal_offset, offset);
        }
    }

1717 1718 1719 1720 1721 1722 1723 1724
    /* calculate the fake index table in display order */
    for (x = 0; x < index_table->nb_ptses; x++) {
        index_table->fake_index[x].timestamp = x;
        if (index_table->ptses[x] != AV_NOPTS_VALUE)
            index_table->fake_index[index_table->ptses[x]].flags = flags[x];
    }
    av_freep(&flags);

1725
    index_table->first_dts = -max_temporal_offset;
1726 1727 1728 1729

    return 0;
}

1730 1731 1732 1733 1734 1735
/**
 * Sorts and collects index table segments into index tables.
 * Also computes PTSes if possible.
 */
static int mxf_compute_index_tables(MXFContext *mxf)
{
1736
    int i, j, k, ret, nb_sorted_segments;
1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755
    MXFIndexTableSegment **sorted_segments = NULL;

    if ((ret = mxf_get_sorted_table_segments(mxf, &nb_sorted_segments, &sorted_segments)) ||
        nb_sorted_segments <= 0) {
        av_log(mxf->fc, AV_LOG_WARNING, "broken or empty index\n");
        return 0;
    }

    /* sanity check and count unique BodySIDs/IndexSIDs */
    for (i = 0; i < nb_sorted_segments; i++) {
        if (i == 0 || sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid)
            mxf->nb_index_tables++;
        else if (sorted_segments[i-1]->body_sid != sorted_segments[i]->body_sid) {
            av_log(mxf->fc, AV_LOG_ERROR, "found inconsistent BodySID\n");
            ret = AVERROR_INVALIDDATA;
            goto finish_decoding_index;
        }
    }

Luca Barbato's avatar
Luca Barbato committed
1756 1757 1758
    mxf->index_tables = av_mallocz_array(mxf->nb_index_tables,
                                         sizeof(*mxf->index_tables));
    if (!mxf->index_tables) {
1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775
        av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate index tables\n");
        ret = AVERROR(ENOMEM);
        goto finish_decoding_index;
    }

    /* distribute sorted segments to index tables */
    for (i = j = 0; i < nb_sorted_segments; i++) {
        if (i != 0 && sorted_segments[i-1]->index_sid != sorted_segments[i]->index_sid) {
            /* next IndexSID */
            j++;
        }

        mxf->index_tables[j].nb_segments++;
    }

    for (i = j = 0; j < mxf->nb_index_tables; i += mxf->index_tables[j++].nb_segments) {
        MXFIndexTable *t = &mxf->index_tables[j];
1776
        MXFTrack *mxf_track = NULL;
1777

Luca Barbato's avatar
Luca Barbato committed
1778 1779 1780 1781
        t->segments = av_mallocz_array(t->nb_segments,
                                       sizeof(*t->segments));

        if (!t->segments) {
1782 1783
            av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate IndexTableSegment"
                   " pointer array\n");
1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794
            ret = AVERROR(ENOMEM);
            goto finish_decoding_index;
        }

        if (sorted_segments[i]->index_start_position)
            av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i starts at EditUnit %"PRId64" - seeking may not work as expected\n",
                   sorted_segments[i]->index_sid, sorted_segments[i]->index_start_position);

        memcpy(t->segments, &sorted_segments[i], t->nb_segments * sizeof(MXFIndexTableSegment*));
        t->index_sid = sorted_segments[i]->index_sid;
        t->body_sid = sorted_segments[i]->body_sid;
1795 1796 1797

        if ((ret = mxf_compute_ptses_fake_index(mxf, t)) < 0)
            goto finish_decoding_index;
1798

1799 1800 1801 1802 1803 1804 1805 1806
        for (k = 0; k < mxf->fc->nb_streams; k++) {
            MXFTrack *track = mxf->fc->streams[k]->priv_data;
            if (track && track->index_sid == t->index_sid) {
                mxf_track = track;
                break;
            }
        }

1807 1808
        /* fix zero IndexDurations */
        for (k = 0; k < t->nb_segments; k++) {
1809 1810 1811 1812 1813 1814 1815
            if (!t->segments[k]->index_edit_rate.num || !t->segments[k]->index_edit_rate.den) {
                av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i segment %i has invalid IndexEditRate\n",
                       t->index_sid, k);
                if (mxf_track)
                    t->segments[k]->index_edit_rate = mxf_track->edit_rate;
            }

1816 1817 1818 1819 1820 1821 1822
            if (t->segments[k]->index_duration)
                continue;

            if (t->nb_segments > 1)
                av_log(mxf->fc, AV_LOG_WARNING, "IndexSID %i segment %i has zero IndexDuration and there's more than one segment\n",
                       t->index_sid, k);

1823
            if (!mxf_track) {
1824 1825 1826 1827 1828 1829 1830
                av_log(mxf->fc, AV_LOG_WARNING, "no streams?\n");
                break;
            }

            /* assume the first stream's duration is reasonable
             * leave index_duration = 0 on further segments in case we have any (unlikely)
             */
1831
            t->segments[k]->index_duration = mxf_track->original_duration;
1832 1833
            break;
        }
1834 1835 1836 1837 1838 1839 1840 1841
    }

    ret = 0;
finish_decoding_index:
    av_free(sorted_segments);
    return ret;
}

1842 1843 1844
static int mxf_is_intra_only(MXFDescriptor *descriptor)
{
    return mxf_get_codec_ul(mxf_intra_only_essence_container_uls,
1845
                            &descriptor->essence_container_ul)->id != AV_CODEC_ID_NONE ||
1846
           mxf_get_codec_ul(mxf_intra_only_picture_essence_coding_uls,
1847
                            &descriptor->essence_codec_ul)->id     != AV_CODEC_ID_NONE;
1848 1849
}

1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867
static int mxf_uid_to_str(UID uid, char **str)
{
    int i;
    char *p;
    p = *str = av_mallocz(sizeof(UID) * 2 + 4 + 1);
    if (!p)
        return AVERROR(ENOMEM);
    for (i = 0; i < sizeof(UID); i++) {
        snprintf(p, 2 + 1, "%.2x", uid[i]);
        p += 2;
        if (i == 3 || i == 5 || i == 7 || i == 9) {
            snprintf(p, 1 + 1, "-");
            p++;
        }
    }
    return 0;
}

1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889
static int mxf_umid_to_str(UID ul, UID uid, char **str)
{
    int i;
    char *p;
    p = *str = av_mallocz(sizeof(UID) * 4 + 2 + 1);
    if (!p)
        return AVERROR(ENOMEM);
    snprintf(p, 2 + 1, "0x");
    p += 2;
    for (i = 0; i < sizeof(UID); i++) {
        snprintf(p, 2 + 1, "%.2X", ul[i]);
        p += 2;

    }
    for (i = 0; i < sizeof(UID); i++) {
        snprintf(p, 2 + 1, "%.2X", uid[i]);
        p += 2;
    }
    return 0;
}

static int mxf_add_umid_metadata(AVDictionary **pm, const char *key, MXFPackage* package)
1890 1891 1892
{
    char *str;
    int ret;
1893 1894 1895
    if (!package)
        return 0;
    if ((ret = mxf_umid_to_str(package->package_ul, package->package_uid, &str)) < 0)
1896 1897 1898 1899 1900
        return ret;
    av_dict_set(pm, key, str, AV_DICT_DONT_STRDUP_VAL);
    return 0;
}

1901 1902 1903 1904 1905 1906 1907 1908
static int mxf_add_timecode_metadata(AVDictionary **pm, const char *key, AVTimecode *tc)
{
    char buf[AV_TIMECODE_STR_SIZE];
    av_dict_set(pm, key, av_timecode_make_string(tc, buf, 0), 0);

    return 0;
}

1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929
static MXFTimecodeComponent* mxf_resolve_timecode_component(MXFContext *mxf, UID *strong_ref)
{
    MXFStructuralComponent *component = NULL;
    MXFPulldownComponent *pulldown = NULL;

    component = mxf_resolve_strong_ref(mxf, strong_ref, AnyType);
    if (!component)
        return NULL;

    switch (component->type) {
    case TimecodeComponent:
        return (MXFTimecodeComponent*)component;
    case PulldownComponent: /* timcode component may be located on a pulldown component */
        pulldown = (MXFPulldownComponent*)component;
        return mxf_resolve_strong_ref(mxf, &pulldown->input_segment_ref, TimecodeComponent);
    default:
        break;
    }
    return NULL;
}

1930
static MXFPackage* mxf_resolve_source_package(MXFContext *mxf, UID package_ul, UID package_uid)
1931 1932 1933 1934 1935 1936 1937 1938 1939
{
    MXFPackage *package = NULL;
    int i;

    for (i = 0; i < mxf->packages_count; i++) {
        package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], SourcePackage);
        if (!package)
            continue;

1940
        if (!memcmp(package->package_ul, package_ul, 16) && !memcmp(package->package_uid, package_uid, 16))
1941 1942 1943 1944 1945
            return package;
    }
    return NULL;
}

1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971
static MXFDescriptor* mxf_resolve_multidescriptor(MXFContext *mxf, MXFDescriptor *descriptor, int track_id)
{
    MXFDescriptor *sub_descriptor = NULL;
    int i;

    if (!descriptor)
        return NULL;

    if (descriptor->type == MultipleDescriptor) {
        for (i = 0; i < descriptor->sub_descriptors_count; i++) {
            sub_descriptor = mxf_resolve_strong_ref(mxf, &descriptor->sub_descriptors_refs[i], Descriptor);

            if (!sub_descriptor) {
                av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");
                continue;
            }
            if (sub_descriptor->linked_track_id == track_id) {
                return sub_descriptor;
            }
        }
    } else if (descriptor->type == Descriptor)
        return descriptor;

    return NULL;
}

1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988
static MXFStructuralComponent* mxf_resolve_essence_group_choice(MXFContext *mxf, MXFEssenceGroup *essence_group)
{
    MXFStructuralComponent *component = NULL;
    MXFPackage *package = NULL;
    MXFDescriptor *descriptor = NULL;
    int i;

    if (!essence_group || !essence_group->structural_components_count)
        return NULL;

    /* essence groups contains multiple representations of the same media,
       this return the first components with a valid Descriptor typically index 0 */
    for (i =0; i < essence_group->structural_components_count; i++){
        component = mxf_resolve_strong_ref(mxf, &essence_group->structural_components_refs[i], SourceClip);
        if (!component)
            continue;

1989
        if (!(package = mxf_resolve_source_package(mxf, component->source_package_ul, component->source_package_uid)))
1990 1991 1992
            continue;

        descriptor = mxf_resolve_strong_ref(mxf, &package->descriptor_ref, Descriptor);
1993
        if (descriptor)
1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016
            return component;
    }
    return NULL;
}

static MXFStructuralComponent* mxf_resolve_sourceclip(MXFContext *mxf, UID *strong_ref)
{
    MXFStructuralComponent *component = NULL;

    component = mxf_resolve_strong_ref(mxf, strong_ref, AnyType);
    if (!component)
        return NULL;
    switch (component->type) {
        case SourceClip:
            return component;
        case EssenceGroup:
            return mxf_resolve_essence_group_choice(mxf, (MXFEssenceGroup*) component);
        default:
            break;
    }
    return NULL;
}

2017 2018 2019
static int mxf_parse_package_comments(MXFContext *mxf, AVDictionary **pm, MXFPackage *package)
{
    MXFTaggedValue *tag;
2020
    int i;
2021 2022 2023 2024 2025 2026 2027
    char *key = NULL;

    for (i = 0; i < package->comment_count; i++) {
        tag = mxf_resolve_strong_ref(mxf, &package->comment_refs[i], TaggedValue);
        if (!tag || !tag->name || !tag->value)
            continue;

2028
        key = av_asprintf("comment_%s", tag->name);
2029 2030 2031 2032 2033 2034 2035 2036
        if (!key)
            return AVERROR(ENOMEM);

        av_dict_set(pm, key, tag->value, AV_DICT_DONT_STRDUP_KEY);
    }
    return 0;
}

2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048
static int mxf_parse_physical_source_package(MXFContext *mxf, MXFTrack *source_track, AVStream *st)
{
    MXFPackage *physical_package = NULL;
    MXFTrack *physical_track = NULL;
    MXFStructuralComponent *sourceclip = NULL;
    MXFTimecodeComponent *mxf_tc = NULL;
    int i, j, k;
    AVTimecode tc;
    int flags;
    int64_t start_position;

    for (i = 0; i < source_track->sequence->structural_components_count; i++) {
2049 2050
        sourceclip = mxf_resolve_strong_ref(mxf, &source_track->sequence->structural_components_refs[i], SourceClip);
        if (!sourceclip)
2051 2052
            continue;

2053
        if (!(physical_package = mxf_resolve_source_package(mxf, sourceclip->source_package_ul, sourceclip->source_package_uid)))
2054 2055
            break;

2056
        mxf_add_umid_metadata(&st->metadata, "reel_umid", physical_package);
2057

2058
        /* the name of physical source package is name of the reel or tape */
2059
        if (physical_package->name && physical_package->name[0])
2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075
            av_dict_set(&st->metadata, "reel_name", physical_package->name, 0);

        /* the source timecode is calculated by adding the start_position of the sourceclip from the file source package track
         * to the start_frame of the timecode component located on one of the tracks of the physical source package.
         */
        for (j = 0; j < physical_package->tracks_count; j++) {
            if (!(physical_track = mxf_resolve_strong_ref(mxf, &physical_package->tracks_refs[j], Track))) {
                av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");
                continue;
            }

            if (!(physical_track->sequence = mxf_resolve_strong_ref(mxf, &physical_track->sequence_ref, Sequence))) {
                av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");
                continue;
            }

2076 2077 2078 2079 2080 2081 2082 2083 2084
            if (physical_track->edit_rate.num <= 0 ||
                physical_track->edit_rate.den <= 0) {
                av_log(mxf->fc, AV_LOG_WARNING,
                       "Invalid edit rate (%d/%d) found on structural"
                       " component #%d, defaulting to 25/1\n",
                       physical_track->edit_rate.num,
                       physical_track->edit_rate.den, i);
                physical_track->edit_rate = (AVRational){25, 1};
            }
2085

2086
            for (k = 0; k < physical_track->sequence->structural_components_count; k++) {
2087 2088
                if (!(mxf_tc = mxf_resolve_timecode_component(mxf, &physical_track->sequence->structural_components_refs[k])))
                    continue;
2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106

                flags = mxf_tc->drop_frame == 1 ? AV_TIMECODE_FLAG_DROPFRAME : 0;
                /* scale sourceclip start_position to match physical track edit rate */
                start_position = av_rescale_q(sourceclip->start_position,
                                              physical_track->edit_rate,
                                              source_track->edit_rate);

                if (av_timecode_init(&tc, mxf_tc->rate, flags, start_position + mxf_tc->start_frame, mxf->fc) == 0) {
                    mxf_add_timecode_metadata(&st->metadata, "timecode", &tc);
                    return 0;
                }
            }
        }
    }

    return 0;
}

2107 2108 2109 2110 2111 2112
static int mxf_add_metadata_stream(MXFContext *mxf, MXFTrack *track)
{
    MXFStructuralComponent *component = NULL;
    const MXFCodecUL *codec_ul = NULL;
    MXFPackage tmp_package;
    AVStream *st;
2113
    int j;
2114

2115
    for (j = 0; j < track->sequence->structural_components_count; j++) {
2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144
        component = mxf_resolve_sourceclip(mxf, &track->sequence->structural_components_refs[j]);
        if (!component)
            continue;
        break;
    }
    if (!component)
        return 0;

    st = avformat_new_stream(mxf->fc, NULL);
    if (!st) {
        av_log(mxf->fc, AV_LOG_ERROR, "could not allocate metadata stream\n");
        return AVERROR(ENOMEM);
    }

    st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
    st->codecpar->codec_id = AV_CODEC_ID_NONE;
    st->id = track->track_id;

    memcpy(&tmp_package.package_ul, component->source_package_ul, 16);
    memcpy(&tmp_package.package_uid, component->source_package_uid, 16);
    mxf_add_umid_metadata(&st->metadata, "file_package_umid", &tmp_package);
    if (track->name && track->name[0])
        av_dict_set(&st->metadata, "track_name", track->name, 0);

    codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &track->sequence->data_definition_ul);
    av_dict_set(&st->metadata, "data_type", av_get_media_type_string(codec_ul->id), 0);
    return 0;
}

2145 2146 2147
static int mxf_parse_structural_metadata(MXFContext *mxf)
{
    MXFPackage *material_package = NULL;
2148
    int i, j, k, ret;
2149

2150
    av_log(mxf->fc, AV_LOG_TRACE, "metadata sets count %d\n", mxf->metadata_sets_count);
2151 2152 2153 2154 2155 2156 2157
    /* TODO: handle multiple material packages (OP3x) */
    for (i = 0; i < mxf->packages_count; i++) {
        material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);
        if (material_package) break;
    }
    if (!material_package) {
        av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");
2158
        return AVERROR_INVALIDDATA;
2159 2160
    }

2161
    mxf_add_umid_metadata(&mxf->fc->metadata, "material_package_umid", material_package);
2162 2163
    if (material_package->name && material_package->name[0])
        av_dict_set(&mxf->fc->metadata, "material_package_name", material_package->name, 0);
2164
    mxf_parse_package_comments(mxf, &mxf->fc->metadata, material_package);
2165

2166 2167 2168 2169 2170 2171 2172
    for (i = 0; i < material_package->tracks_count; i++) {
        MXFPackage *source_package = NULL;
        MXFTrack *material_track = NULL;
        MXFTrack *source_track = NULL;
        MXFTrack *temp_track = NULL;
        MXFDescriptor *descriptor = NULL;
        MXFStructuralComponent *component = NULL;
2173
        MXFTimecodeComponent *mxf_tc = NULL;
2174 2175 2176
        UID *essence_container_ul = NULL;
        const MXFCodecUL *codec_ul = NULL;
        const MXFCodecUL *container_ul = NULL;
2177
        const MXFCodecUL *pix_fmt_ul = NULL;
2178
        AVStream *st;
2179 2180
        AVTimecode tc;
        int flags;
2181 2182 2183 2184 2185 2186

        if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {
            av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");
            continue;
        }

2187 2188 2189
        if ((component = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, TimecodeComponent))) {
            mxf_tc = (MXFTimecodeComponent*)component;
            flags = mxf_tc->drop_frame == 1 ? AV_TIMECODE_FLAG_DROPFRAME : 0;
2190
            if (av_timecode_init(&tc, mxf_tc->rate, flags, mxf_tc->start_frame, mxf->fc) == 0) {
2191 2192 2193 2194
                mxf_add_timecode_metadata(&mxf->fc->metadata, "timecode", &tc);
            }
        }

2195 2196
        if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {
            av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");
2197
            continue;
2198 2199
        }

2200 2201 2202 2203 2204 2205 2206
        for (j = 0; j < material_track->sequence->structural_components_count; j++) {
            component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], TimecodeComponent);
            if (!component)
                continue;

            mxf_tc = (MXFTimecodeComponent*)component;
            flags = mxf_tc->drop_frame == 1 ? AV_TIMECODE_FLAG_DROPFRAME : 0;
2207
            if (av_timecode_init(&tc, mxf_tc->rate, flags, mxf_tc->start_frame, mxf->fc) == 0) {
2208 2209 2210 2211 2212
                mxf_add_timecode_metadata(&mxf->fc->metadata, "timecode", &tc);
                break;
            }
        }

2213 2214 2215 2216 2217
        /* TODO: handle multiple source clips, only finds first valid source clip */
        if(material_track->sequence->structural_components_count > 1)
            av_log(mxf->fc, AV_LOG_WARNING, "material track %d: has %d components\n",
                       material_track->track_id, material_track->sequence->structural_components_count);

2218
        for (j = 0; j < material_track->sequence->structural_components_count; j++) {
2219
            component = mxf_resolve_sourceclip(mxf, &material_track->sequence->structural_components_refs[j]);
2220 2221 2222
            if (!component)
                continue;

2223
            source_package = mxf_resolve_source_package(mxf, component->source_package_ul, component->source_package_uid);
2224
            if (!source_package) {
2225
                av_log(mxf->fc, AV_LOG_TRACE, "material track %d: no corresponding source package found\n", material_track->track_id);
2226
                continue;
2227 2228 2229 2230
            }
            for (k = 0; k < source_package->tracks_count; k++) {
                if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {
                    av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");
2231
                    ret = AVERROR_INVALIDDATA;
2232
                    goto fail_and_free;
2233 2234 2235 2236 2237 2238 2239 2240 2241 2242
                }
                if (temp_track->track_id == component->source_track_id) {
                    source_track = temp_track;
                    break;
                }
            }
            if (!source_track) {
                av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);
                break;
            }
2243 2244 2245 2246 2247

            for (k = 0; k < mxf->essence_container_data_count; k++) {
                MXFEssenceContainerData *essence_data;

                if (!(essence_data = mxf_resolve_strong_ref(mxf, &mxf->essence_container_data_refs[k], EssenceContainerData))) {
2248
                    av_log(mxf->fc, AV_LOG_TRACE, "could not resolve essence container data strong ref\n");
2249 2250 2251 2252 2253 2254 2255 2256 2257
                    continue;
                }
                if (!memcmp(component->source_package_ul, essence_data->package_ul, sizeof(UID)) && !memcmp(component->source_package_uid, essence_data->package_uid, sizeof(UID))) {
                    source_track->body_sid = essence_data->body_sid;
                    source_track->index_sid = essence_data->index_sid;
                    break;
                }
            }

2258 2259
            if(source_track && component)
                break;
2260
        }
2261 2262 2263
        if (!source_track || !component || !source_package) {
            if((ret = mxf_add_metadata_stream(mxf, material_track)))
                goto fail_and_free;
2264
            continue;
2265
        }
2266

2267 2268
        if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {
            av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");
2269
            ret = AVERROR_INVALIDDATA;
2270
            goto fail_and_free;
2271 2272 2273 2274 2275 2276 2277 2278 2279
        }

        /* 0001GL00.MXF.A1.mxf_opatom.mxf has the same SourcePackageID as 0001GL.MXF.V1.mxf_opatom.mxf
         * This would result in both files appearing to have two streams. Work around this by sanity checking DataDefinition */
        if (memcmp(material_track->sequence->data_definition_ul, source_track->sequence->data_definition_ul, 16)) {
            av_log(mxf->fc, AV_LOG_ERROR, "material track %d: DataDefinition mismatch\n", material_track->track_id);
            continue;
        }

2280
        st = avformat_new_stream(mxf->fc, NULL);
2281 2282
        if (!st) {
            av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");
2283 2284
            ret = AVERROR(ENOMEM);
            goto fail_and_free;
2285
        }
2286
        st->id = material_track->track_id;
2287
        st->priv_data = source_track;
2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298

        source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);
        descriptor = mxf_resolve_multidescriptor(mxf, source_package->descriptor, source_track->track_id);

        /* A SourceClip from a EssenceGroup may only be a single frame of essence data. The clips duration is then how many
         * frames its suppose to repeat for. Descriptor->duration, if present, contains the real duration of the essence data */
        if (descriptor && descriptor->duration != AV_NOPTS_VALUE)
            source_track->original_duration = st->duration = FFMIN(descriptor->duration, component->duration);
        else
            source_track->original_duration = st->duration = component->duration;

2299 2300 2301
        if (st->duration == -1)
            st->duration = AV_NOPTS_VALUE;
        st->start_time = component->start_position;
2302 2303
        if (material_track->edit_rate.num <= 0 ||
            material_track->edit_rate.den <= 0) {
2304
            av_log(mxf->fc, AV_LOG_WARNING,
2305 2306 2307 2308
                   "Invalid edit rate (%d/%d) found on stream #%d, "
                   "defaulting to 25/1\n",
                   material_track->edit_rate.num,
                   material_track->edit_rate.den, st->index);
2309 2310
            material_track->edit_rate = (AVRational){25, 1};
        }
2311
        avpriv_set_pts_info(st, 64, material_track->edit_rate.den, material_track->edit_rate.num);
2312

2313 2314
        /* ensure SourceTrack EditRate == MaterialTrack EditRate since only
         * the former is accessible via st->priv_data */
2315 2316
        source_track->edit_rate = material_track->edit_rate;

2317
        PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);
2318
        codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);
2319
        st->codecpar->codec_type = codec_ul->id;
2320 2321 2322 2323 2324 2325 2326 2327

        if (!descriptor) {
            av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);
            continue;
        }
        PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);
        PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);
        essence_container_ul = &descriptor->essence_container_ul;
2328 2329 2330
        source_track->wrapping = (mxf->op == OPAtom) ? ClipWrapped : mxf_get_wrapping_kind(essence_container_ul);
        if (source_track->wrapping == UnknownWrapped)
            av_log(mxf->fc, AV_LOG_INFO, "wrapping of stream %d is unknown\n", st->index);
2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342
        /* HACK: replacing the original key with mxf_encrypted_essence_container
         * is not allowed according to s429-6, try to find correct information anyway */
        if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {
            av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");
            for (k = 0; k < mxf->metadata_sets_count; k++) {
                MXFMetadataSet *metadata = mxf->metadata_sets[k];
                if (metadata->type == CryptoContext) {
                    essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;
                    break;
                }
            }
        }
2343

2344
        /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */
2345
        codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);
2346 2347
        st->codecpar->codec_id = (enum AVCodecID)codec_ul->id;
        if (st->codecpar->codec_id == AV_CODEC_ID_NONE) {
2348
            codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->codec_ul);
2349
            st->codecpar->codec_id = (enum AVCodecID)codec_ul->id;
2350 2351
        }

2352
        av_log(mxf->fc, AV_LOG_VERBOSE, "%s: Universal Label: ",
2353
               avcodec_get_name(st->codecpar->codec_id));
2354
        for (k = 0; k < 16; k++) {
2355 2356
            av_log(mxf->fc, AV_LOG_VERBOSE, "%.2x",
                   descriptor->essence_codec_ul[k]);
2357 2358 2359
            if (!(k+1 & 19) || k == 5)
                av_log(mxf->fc, AV_LOG_VERBOSE, ".");
        }
2360
        av_log(mxf->fc, AV_LOG_VERBOSE, "\n");
2361

2362
        mxf_add_umid_metadata(&st->metadata, "file_package_umid", source_package);
2363 2364
        if (source_package->name && source_package->name[0])
            av_dict_set(&st->metadata, "file_package_name", source_package->name, 0);
2365 2366
        if (material_track->name && material_track->name[0])
            av_dict_set(&st->metadata, "track_name", material_track->name, 0);
2367

2368 2369
        mxf_parse_physical_source_package(mxf, source_track, st);

2370
        if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
2371
            source_track->intra_only = mxf_is_intra_only(descriptor);
2372
            container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, essence_container_ul);
2373 2374 2375
            if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
                st->codecpar->codec_id = container_ul->id;
            st->codecpar->width = descriptor->width;
2376
            st->codecpar->height = descriptor->height; /* Field height, not frame height */
2377 2378
            switch (descriptor->frame_layout) {
                case FullFrame:
2379
                    st->codecpar->field_order = AV_FIELD_PROGRESSIVE;
2380 2381 2382 2383 2384 2385 2386 2387
                    break;
                case OneField:
                    /* Every other line is stored and needs to be duplicated. */
                    av_log(mxf->fc, AV_LOG_INFO, "OneField frame layout isn't currently supported\n");
                    break; /* The correct thing to do here is fall through, but by breaking we might be
                              able to decode some streams at half the vertical resolution, rather than not al all.
                              It's also for compatibility with the old behavior. */
                case MixedFields:
2388
                    break;
2389
                case SegmentedFrame:
2390
                    st->codecpar->field_order = AV_FIELD_PROGRESSIVE;
2391
                case SeparateFields:
2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430
                    av_log(mxf->fc, AV_LOG_DEBUG, "video_line_map: (%d, %d), field_dominance: %d\n",
                           descriptor->video_line_map[0], descriptor->video_line_map[1],
                           descriptor->field_dominance);
                    if ((descriptor->video_line_map[0] > 0) && (descriptor->video_line_map[1] > 0)) {
                        /* Detect coded field order from VideoLineMap:
                         *  (even, even) => bottom field coded first
                         *  (even, odd)  => top field coded first
                         *  (odd, even)  => top field coded first
                         *  (odd, odd)   => bottom field coded first
                         */
                        if ((descriptor->video_line_map[0] + descriptor->video_line_map[1]) % 2) {
                            switch (descriptor->field_dominance) {
                                case MXF_FIELD_DOMINANCE_DEFAULT:
                                case MXF_FIELD_DOMINANCE_FF:
                                    st->codecpar->field_order = AV_FIELD_TT;
                                    break;
                                case MXF_FIELD_DOMINANCE_FL:
                                    st->codecpar->field_order = AV_FIELD_TB;
                                    break;
                                default:
                                    avpriv_request_sample(mxf->fc,
                                                          "Field dominance %d support",
                                                          descriptor->field_dominance);
                            }
                        } else {
                            switch (descriptor->field_dominance) {
                                case MXF_FIELD_DOMINANCE_DEFAULT:
                                case MXF_FIELD_DOMINANCE_FF:
                                    st->codecpar->field_order = AV_FIELD_BB;
                                    break;
                                case MXF_FIELD_DOMINANCE_FL:
                                    st->codecpar->field_order = AV_FIELD_BT;
                                    break;
                                default:
                                    avpriv_request_sample(mxf->fc,
                                                          "Field dominance %d support",
                                                          descriptor->field_dominance);
                            }
                        }
2431
                    }
2432
                    /* Turn field height into frame height. */
2433
                    st->codecpar->height *= 2;
2434
                    break;
2435 2436 2437
                default:
                    av_log(mxf->fc, AV_LOG_INFO, "Unknown frame layout type: %d\n", descriptor->frame_layout);
            }
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            if (st->codecpar->codec_id == AV_CODEC_ID_PRORES) {
                switch (descriptor->essence_codec_ul[14]) {
                case 1: st->codecpar->codec_tag = MKTAG('a','p','c','o'); break;
                case 2: st->codecpar->codec_tag = MKTAG('a','p','c','s'); break;
                case 3: st->codecpar->codec_tag = MKTAG('a','p','c','n'); break;
                case 4: st->codecpar->codec_tag = MKTAG('a','p','c','h'); break;
                case 5: st->codecpar->codec_tag = MKTAG('a','p','4','h'); break;
                case 6: st->codecpar->codec_tag = MKTAG('a','p','4','x'); break;
                }
            }

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            if (st->codecpar->codec_id == AV_CODEC_ID_RAWVIDEO) {
                st->codecpar->format = descriptor->pix_fmt;
                if (st->codecpar->format == AV_PIX_FMT_NONE) {
2453 2454
                    pix_fmt_ul = mxf_get_codec_ul(ff_mxf_pixel_format_uls,
                                                  &descriptor->essence_codec_ul);
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                    st->codecpar->format = (enum AVPixelFormat)pix_fmt_ul->id;
                    if (st->codecpar->format== AV_PIX_FMT_NONE) {
                        st->codecpar->codec_tag = mxf_get_codec_ul(ff_mxf_codec_tag_uls,
                                                                   &descriptor->essence_codec_ul)->id;
                        if (!st->codecpar->codec_tag) {
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                            /* support files created before RP224v10 by defaulting to UYVY422
                               if subsampling is 4:2:2 and component depth is 8-bit */
                            if (descriptor->horiz_subsampling == 2 &&
                                descriptor->vert_subsampling == 1 &&
                                descriptor->component_depth == 8) {
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                                st->codecpar->format = AV_PIX_FMT_UYVY422;
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                            }
2467
                        }
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                    }
                }
            }
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            st->need_parsing = AVSTREAM_PARSE_HEADERS;
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            if (material_track->sequence->origin) {
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                av_dict_set_int(&st->metadata, "material_track_origin", material_track->sequence->origin, 0);
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            }
            if (source_track->sequence->origin) {
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                av_dict_set_int(&st->metadata, "source_track_origin", source_track->sequence->origin, 0);
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            }
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            if (descriptor->aspect_ratio.num && descriptor->aspect_ratio.den)
                st->display_aspect_ratio = descriptor->aspect_ratio;
2480
        } else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
2481
            container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, essence_container_ul);
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            /* Only overwrite existing codec ID if it is unset or A-law, which is the default according to SMPTE RP 224. */
2483 2484
            if (st->codecpar->codec_id == AV_CODEC_ID_NONE || (st->codecpar->codec_id == AV_CODEC_ID_PCM_ALAW && (enum AVCodecID)container_ul->id != AV_CODEC_ID_NONE))
                st->codecpar->codec_id = (enum AVCodecID)container_ul->id;
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            st->codecpar->channels = descriptor->channels;
2486

2487
            if (descriptor->sample_rate.den > 0) {
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                st->codecpar->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;
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                avpriv_set_pts_info(st, 64, descriptor->sample_rate.den, descriptor->sample_rate.num);
2490
            } else {
2491
                av_log(mxf->fc, AV_LOG_WARNING, "invalid sample rate (%d/%d) "
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                       "found for stream #%d, time base forced to 1/48000\n",
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                       descriptor->sample_rate.num, descriptor->sample_rate.den,
                       st->index);
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                avpriv_set_pts_info(st, 64, 1, 48000);
            }
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            /* if duration is set, rescale it from EditRate to SampleRate */
            if (st->duration != AV_NOPTS_VALUE)
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                st->duration = av_rescale_q(st->duration,
                                            av_inv_q(material_track->edit_rate),
                                            st->time_base);
2503

2504
            /* TODO: implement AV_CODEC_ID_RAWAUDIO */
2505
            if (st->codecpar->codec_id == AV_CODEC_ID_PCM_S16LE) {
2506
                if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)
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                    st->codecpar->codec_id = AV_CODEC_ID_PCM_S24LE;
2508
                else if (descriptor->bits_per_sample == 32)
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                    st->codecpar->codec_id = AV_CODEC_ID_PCM_S32LE;
            } else if (st->codecpar->codec_id == AV_CODEC_ID_PCM_S16BE) {
2511
                if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)
2512
                    st->codecpar->codec_id = AV_CODEC_ID_PCM_S24BE;
2513
                else if (descriptor->bits_per_sample == 32)
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                    st->codecpar->codec_id = AV_CODEC_ID_PCM_S32BE;
            } else if (st->codecpar->codec_id == AV_CODEC_ID_MP2) {
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                st->need_parsing = AVSTREAM_PARSE_FULL;
            }
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            st->codecpar->bits_per_coded_sample = av_get_bits_per_sample(st->codecpar->codec_id);
2519
        } else if (st->codecpar->codec_type == AVMEDIA_TYPE_DATA) {
2520
            enum AVMediaType type;
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            container_ul = mxf_get_codec_ul(mxf_data_essence_container_uls, essence_container_ul);
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            if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
                st->codecpar->codec_id = container_ul->id;
            type = avcodec_get_type(st->codecpar->codec_id);
            if (type == AVMEDIA_TYPE_SUBTITLE)
                st->codecpar->codec_type = type;
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            if (container_ul->desc)
                av_dict_set(&st->metadata, "data_type", container_ul->desc, 0);
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            if (mxf->eia608_extract &&
                !strcmp(container_ul->desc, "vbi_vanc_smpte_436M")) {
                st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
                st->codecpar->codec_id = AV_CODEC_ID_EIA_608;
            }
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        }
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        if (descriptor->extradata) {
2536
            if (!ff_alloc_extradata(st->codecpar, descriptor->extradata_size)) {
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                memcpy(st->codecpar->extradata, descriptor->extradata, descriptor->extradata_size);
2538
            }
2539
        } else if (st->codecpar->codec_id == AV_CODEC_ID_H264) {
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            int coded_width = mxf_get_codec_ul(mxf_intra_only_picture_coded_width,
                                               &descriptor->essence_codec_ul)->id;
            if (coded_width)
2543
                st->codecpar->width = coded_width;
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            ret = ff_generate_avci_extradata(st);
            if (ret < 0)
                return ret;
2547
        }
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        if (st->codecpar->codec_type != AVMEDIA_TYPE_DATA && source_track->wrapping != FrameWrapped) {
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            /* TODO: decode timestamps */
            st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
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        }
    }
2553

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    for (int i = 0; i < mxf->fc->nb_streams; i++) {
        MXFTrack *track1 = mxf->fc->streams[i]->priv_data;
        if (track1 && track1->body_sid) {
            for (int j = i + 1; j < mxf->fc->nb_streams; j++) {
                MXFTrack *track2 = mxf->fc->streams[j]->priv_data;
                if (track2 && track1->body_sid == track2->body_sid && track1->wrapping != track2->wrapping) {
                    if (track1->wrapping == UnknownWrapped)
                        track1->wrapping = track2->wrapping;
                    else if (track2->wrapping == UnknownWrapped)
                        track2->wrapping = track1->wrapping;
                    else
                        av_log(mxf->fc, AV_LOG_ERROR, "stream %d and stream %d have the same BodySID (%d) "
                                                      "with different wrapping\n", i, j, track1->body_sid);
                }
            }
        }
    }

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    ret = 0;
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fail_and_free:
    return ret;
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}

2577
static int64_t mxf_timestamp_to_int64(uint64_t timestamp)
2578
{
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    struct tm time = { 0 };
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    int msecs;
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    time.tm_year = (timestamp >> 48) - 1900;
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    time.tm_mon  = (timestamp >> 40 & 0xFF) - 1;
    time.tm_mday = (timestamp >> 32 & 0xFF);
    time.tm_hour = (timestamp >> 24 & 0xFF);
    time.tm_min  = (timestamp >> 16 & 0xFF);
    time.tm_sec  = (timestamp >> 8  & 0xFF);
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    msecs        = (timestamp & 0xFF) * 4;
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    /* Clip values for legacy reasons. Maybe we should return error instead? */
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    time.tm_mon  = av_clip(time.tm_mon,  0, 11);
    time.tm_mday = av_clip(time.tm_mday, 1, 31);
    time.tm_hour = av_clip(time.tm_hour, 0, 23);
    time.tm_min  = av_clip(time.tm_min,  0, 59);
    time.tm_sec  = av_clip(time.tm_sec,  0, 59);
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    msecs        = av_clip(msecs, 0, 999);
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    return (int64_t)av_timegm(&time) * 1000000 + msecs * 1000;
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}

#define SET_STR_METADATA(pb, name, str) do { \
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    if ((ret = mxf_read_utf16be_string(pb, size, &str)) < 0) \
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        return ret; \
    av_dict_set(&s->metadata, name, str, AV_DICT_DONT_STRDUP_VAL); \
} while (0)

#define SET_UID_METADATA(pb, name, var, str) do { \
    avio_read(pb, var, 16); \
    if ((ret = mxf_uid_to_str(var, &str)) < 0) \
        return ret; \
    av_dict_set(&s->metadata, name, str, AV_DICT_DONT_STRDUP_VAL); \
} while (0)

#define SET_TS_METADATA(pb, name, var, str) do { \
    var = avio_rb64(pb); \
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    if (var && (ret = avpriv_dict_set_timestamp(&s->metadata, name, mxf_timestamp_to_int64(var))) < 0) \
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        return ret; \
} while (0)

static int mxf_read_identification_metadata(void *arg, AVIOContext *pb, int tag, int size, UID _uid, int64_t klv_offset)
{
    MXFContext *mxf = arg;
    AVFormatContext *s = mxf->fc;
    int ret;
    UID uid = { 0 };
    char *str = NULL;
    uint64_t ts;
    switch (tag) {
    case 0x3C01:
        SET_STR_METADATA(pb, "company_name", str);
        break;
    case 0x3C02:
        SET_STR_METADATA(pb, "product_name", str);
        break;
    case 0x3C04:
        SET_STR_METADATA(pb, "product_version", str);
        break;
    case 0x3C05:
        SET_UID_METADATA(pb, "product_uid", uid, str);
        break;
    case 0x3C06:
        SET_TS_METADATA(pb, "modification_date", ts, str);
        break;
    case 0x3C08:
        SET_STR_METADATA(pb, "application_platform", str);
        break;
    case 0x3C09:
        SET_UID_METADATA(pb, "generation_uid", uid, str);
        break;
    case 0x3C0A:
        SET_UID_METADATA(pb, "uid", uid, str);
        break;
    }
    return 0;
}

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static int mxf_read_preface_metadata(void *arg, AVIOContext *pb, int tag, int size, UID uid, int64_t klv_offset)
{
    MXFContext *mxf = arg;
    AVFormatContext *s = mxf->fc;
    int ret;
    char *str = NULL;

    if (tag >= 0x8000 && (IS_KLV_KEY(uid, mxf_avid_project_name))) {
        SET_STR_METADATA(pb, "project_name", str);
    }
    return 0;
}

2669
static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {
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    { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },
    { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x01,0x00 }, mxf_read_partition_pack },
    { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x02,0x00 }, mxf_read_partition_pack },
    { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x03,0x00 }, mxf_read_partition_pack },
    { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02,0x04,0x00 }, mxf_read_partition_pack },
    { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x01,0x00 }, mxf_read_partition_pack },
    { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x02,0x00 }, mxf_read_partition_pack },
    { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x03,0x00 }, mxf_read_partition_pack },
    { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x03,0x04,0x00 }, mxf_read_partition_pack },
    { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x02,0x00 }, mxf_read_partition_pack },
    { { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x04,0x04,0x00 }, mxf_read_partition_pack },
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    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x2f,0x00 }, mxf_read_preface_metadata },
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    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x30,0x00 }, mxf_read_identification_metadata },
    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },
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    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_package, sizeof(MXFPackage), SourcePackage },
    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_package, sizeof(MXFPackage), MaterialPackage },
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    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0f,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },
2687
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0D,0x01,0x01,0x01,0x01,0x01,0x05,0x00 }, mxf_read_essence_group, sizeof(MXFEssenceGroup), EssenceGroup},
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    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },
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    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3f,0x00 }, mxf_read_tagged_value, sizeof(MXFTaggedValue), TaggedValue },
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    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },
    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Generic Sound */
    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */
    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */
    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */
    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */
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    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* MPEG2VideoDescriptor */
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    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x5b,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* VBI - SMPTE 436M */
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    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x5c,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* VANC/VBI - SMPTE 436M */
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    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x5e,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* MPEG2AudioDescriptor */
2700
    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x64,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* DC Timed Text Descriptor */
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    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */
    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */
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    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x14,0x00 }, mxf_read_timecode_component, sizeof(MXFTimecodeComponent), TimecodeComponent },
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    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0c,0x00 }, mxf_read_pulldown_component, sizeof(MXFPulldownComponent), PulldownComponent },
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    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },
    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },
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    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x23,0x00 }, mxf_read_essence_container_data, sizeof(MXFEssenceContainerData), EssenceContainerData },
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    { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },
};

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static int mxf_metadataset_init(MXFMetadataSet *ctx, enum MXFMetadataSetType type)
{
    switch (type){
    case MultipleDescriptor:
    case Descriptor:
        ((MXFDescriptor*)ctx)->pix_fmt = AV_PIX_FMT_NONE;
        ((MXFDescriptor*)ctx)->duration = AV_NOPTS_VALUE;
        break;
    default:
        break;
    }
    return 0;
}

2725
static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadFunc *read_child, int ctx_size, enum MXFMetadataSetType type)
2726
{
2727
    AVIOContext *pb = mxf->fc->pb;
2728
    MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;
2729
    uint64_t klv_end = avio_tell(pb) + klv->length;
2730 2731

    if (!ctx)
2732
        return AVERROR(ENOMEM);
2733
    mxf_metadataset_init(ctx, type);
2734
    while (avio_tell(pb) + 4 < klv_end && !avio_feof(pb)) {
2735
        int ret;
2736 2737
        int tag = avio_rb16(pb);
        int size = avio_rb16(pb); /* KLV specified by 0x53 */
2738
        uint64_t next = avio_tell(pb) + size;
2739 2740
        UID uid = {0};

2741
        av_log(mxf->fc, AV_LOG_TRACE, "local tag %#04x size %d\n", tag, size);
2742
        if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */
2743
            av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);
2744 2745 2746 2747 2748 2749 2750 2751
            continue;
        }
        if (tag > 0x7FFF) { /* dynamic tag */
            int i;
            for (i = 0; i < mxf->local_tags_count; i++) {
                int local_tag = AV_RB16(mxf->local_tags+i*18);
                if (local_tag == tag) {
                    memcpy(uid, mxf->local_tags+i*18+2, 16);
2752
                    av_log(mxf->fc, AV_LOG_TRACE, "local tag %#04x\n", local_tag);
2753 2754 2755 2756
                    PRINT_KEY(mxf->fc, "uid", uid);
                }
            }
        }
2757
        if (ctx_size && tag == 0x3C0A) {
2758
            avio_read(pb, ctx->uid, 16);
2759
        } else if ((ret = read_child(ctx, pb, tag, size, uid, -1)) < 0) {
2760 2761
            if (ctx_size)
                mxf_free_metadataset(&ctx, 1);
2762
            return ret;
2763
        }
2764

2765 2766
        /* Accept the 64k local set limit being exceeded (Avid). Don't accept
         * it extending past the end of the KLV though (zzuf5.mxf). */
2767
        if (avio_tell(pb) > klv_end) {
2768 2769
            if (ctx_size) {
                ctx->type = type;
2770
                mxf_free_metadataset(&ctx, 1);
2771
            }
2772

2773 2774
            av_log(mxf->fc, AV_LOG_ERROR,
                   "local tag %#04x extends past end of local set @ %#"PRIx64"\n",
2775 2776 2777
                   tag, klv->offset);
            return AVERROR_INVALIDDATA;
        } else if (avio_tell(pb) <= next)   /* only seek forward, else this can loop for a long time */
2778
            avio_seek(pb, next, SEEK_SET);
2779 2780 2781 2782 2783
    }
    if (ctx_size) ctx->type = type;
    return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;
}

2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828
/**
 * Matches any partition pack key, in other words:
 * - HeaderPartition
 * - BodyPartition
 * - FooterPartition
 * @return non-zero if the key is a partition pack key, zero otherwise
 */
static int mxf_is_partition_pack_key(UID key)
{
    //NOTE: this is a little lax since it doesn't constraint key[14]
    return !memcmp(key, mxf_header_partition_pack_key, 13) &&
            key[13] >= 2 && key[13] <= 4;
}

/**
 * Parses a metadata KLV
 * @return <0 on error, 0 otherwise
 */
static int mxf_parse_klv(MXFContext *mxf, KLVPacket klv, MXFMetadataReadFunc *read,
                                     int ctx_size, enum MXFMetadataSetType type)
{
    AVFormatContext *s = mxf->fc;
    int res;
    if (klv.key[5] == 0x53) {
        res = mxf_read_local_tags(mxf, &klv, read, ctx_size, type);
    } else {
        uint64_t next = avio_tell(s->pb) + klv.length;
        res = read(mxf, s->pb, 0, klv.length, klv.key, klv.offset);

        /* only seek forward, else this can loop for a long time */
        if (avio_tell(s->pb) > next) {
            av_log(s, AV_LOG_ERROR, "read past end of KLV @ %#"PRIx64"\n",
                   klv.offset);
            return AVERROR_INVALIDDATA;
        }

        avio_seek(s->pb, next, SEEK_SET);
    }
    if (res < 0) {
        av_log(s, AV_LOG_ERROR, "error reading header metadata\n");
        return res;
    }
    return 0;
}

2829
/**
2830
 * Seeks to the previous partition and parses it, if possible
2831 2832 2833 2834 2835
 * @return <= 0 if we should stop parsing, > 0 if we should keep going
 */
static int mxf_seek_to_previous_partition(MXFContext *mxf)
{
    AVIOContext *pb = mxf->fc->pb;
2836 2837 2838
    KLVPacket klv;
    int64_t current_partition_ofs;
    int ret;
2839 2840 2841 2842 2843 2844

    if (!mxf->current_partition ||
        mxf->run_in + mxf->current_partition->previous_partition <= mxf->last_forward_tell)
        return 0;   /* we've parsed all partitions */

    /* seek to previous partition */
2845
    current_partition_ofs = mxf->current_partition->pack_ofs;   //includes run-in
2846 2847 2848
    avio_seek(pb, mxf->run_in + mxf->current_partition->previous_partition, SEEK_SET);
    mxf->current_partition = NULL;

2849
    av_log(mxf->fc, AV_LOG_TRACE, "seeking to previous partition\n");
2850

2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876
    /* Make sure this is actually a PartitionPack, and if so parse it.
     * See deadlock2.mxf
     */
    if ((ret = klv_read_packet(&klv, pb)) < 0) {
        av_log(mxf->fc, AV_LOG_ERROR, "failed to read PartitionPack KLV\n");
        return ret;
    }

    if (!mxf_is_partition_pack_key(klv.key)) {
        av_log(mxf->fc, AV_LOG_ERROR, "PreviousPartition @ %" PRIx64 " isn't a PartitionPack\n", klv.offset);
        return AVERROR_INVALIDDATA;
    }

    /* We can't just check ofs >= current_partition_ofs because PreviousPartition
     * can point to just before the current partition, causing klv_read_packet()
     * to sync back up to it. See deadlock3.mxf
     */
    if (klv.offset >= current_partition_ofs) {
        av_log(mxf->fc, AV_LOG_ERROR, "PreviousPartition for PartitionPack @ %"
               PRIx64 " indirectly points to itself\n", current_partition_ofs);
        return AVERROR_INVALIDDATA;
    }

    if ((ret = mxf_parse_klv(mxf, klv, mxf_read_partition_pack, 0, 0)) < 0)
        return ret;

2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890
    return 1;
}

/**
 * Called when essence is encountered
 * @return <= 0 if we should stop parsing, > 0 if we should keep going
 */
static int mxf_parse_handle_essence(MXFContext *mxf)
{
    AVIOContext *pb = mxf->fc->pb;
    int64_t ret;

    if (mxf->parsing_backward) {
        return mxf_seek_to_previous_partition(mxf);
2891
    } else {
2892
        if (!mxf->footer_partition) {
2893
            av_log(mxf->fc, AV_LOG_TRACE, "no FooterPartition\n");
2894 2895
            return 0;
        }
2896

2897
        av_log(mxf->fc, AV_LOG_TRACE, "seeking to FooterPartition\n");
2898 2899 2900 2901

        /* remember where we were so we don't end up seeking further back than this */
        mxf->last_forward_tell = avio_tell(pb);

2902
        if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
2903
            av_log(mxf->fc, AV_LOG_INFO, "file is not seekable - not parsing FooterPartition\n");
2904 2905 2906
            return -1;
        }

2907 2908
        /* seek to FooterPartition and parse backward */
        if ((ret = avio_seek(pb, mxf->run_in + mxf->footer_partition, SEEK_SET)) < 0) {
2909
            av_log(mxf->fc, AV_LOG_ERROR,
2910
                   "failed to seek to FooterPartition @ 0x%" PRIx64
2911
                   " (%"PRId64") - partial file?\n",
2912
                   mxf->run_in + mxf->footer_partition, ret);
2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931
            return ret;
        }

        mxf->current_partition = NULL;
        mxf->parsing_backward = 1;
    }

    return 1;
}

/**
 * Called when the next partition or EOF is encountered
 * @return <= 0 if we should stop parsing, > 0 if we should keep going
 */
static int mxf_parse_handle_partition_or_eof(MXFContext *mxf)
{
    return mxf->parsing_backward ? mxf_seek_to_previous_partition(mxf) : 1;
}

2932 2933 2934 2935 2936 2937 2938 2939 2940 2941
static MXFWrappingScheme mxf_get_wrapping_by_body_sid(AVFormatContext *s, int body_sid)
{
    for (int i = 0; i < s->nb_streams; i++) {
        MXFTrack *track = s->streams[i]->priv_data;
        if (track && track->body_sid == body_sid && track->wrapping != UnknownWrapped)
            return track->wrapping;
    }
    return UnknownWrapped;
}

2942 2943 2944
/**
 * Figures out the proper offset and length of the essence container in each partition
 */
2945
static void mxf_compute_essence_containers(AVFormatContext *s)
2946
{
2947
    MXFContext *mxf = s->priv_data;
2948 2949 2950 2951
    int x;

    for (x = 0; x < mxf->partitions_count; x++) {
        MXFPartition *p = &mxf->partitions[x];
2952
        MXFWrappingScheme wrapping;
2953 2954 2955 2956

        if (!p->body_sid)
            continue;       /* BodySID == 0 -> no essence */

2957 2958
        /* for clip wrapped essences we point essence_offset after the KL (usually klv.offset + 20 or 25)
         * otherwise we point essence_offset at the key of the first essence KLV.
2959
         */
2960

2961
        wrapping = (mxf->op == OPAtom) ? ClipWrapped : mxf_get_wrapping_by_body_sid(s, p->body_sid);
2962

2963 2964 2965 2966
        if (wrapping == ClipWrapped) {
            p->essence_offset = p->first_essence_klv.next_klv - p->first_essence_klv.length;
            p->essence_length = p->first_essence_klv.length;
        } else {
2967
            p->essence_offset = p->first_essence_klv.offset;
2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979

            /* essence container spans to the next partition */
            if (x < mxf->partitions_count - 1)
                p->essence_length = mxf->partitions[x+1].this_partition - p->essence_offset;

            if (p->essence_length < 0) {
                /* next ThisPartition < essence_offset */
                p->essence_length = 0;
                av_log(mxf->fc, AV_LOG_ERROR,
                       "partition %i: bad ThisPartition = %"PRIX64"\n",
                       x+1, mxf->partitions[x+1].this_partition);
            }
2980 2981 2982 2983
        }
    }
}

2984
static int is_pcm(enum AVCodecID codec_id)
2985 2986
{
    /* we only care about "normal" PCM codecs until we get samples */
2987
    return codec_id >= AV_CODEC_ID_PCM_S16LE && codec_id < AV_CODEC_ID_PCM_S24DAUD;
2988 2989
}

2990 2991 2992 2993 2994 2995 2996 2997 2998
static MXFIndexTable *mxf_find_index_table(MXFContext *mxf, int index_sid)
{
    int i;
    for (i = 0; i < mxf->nb_index_tables; i++)
        if (mxf->index_tables[i].index_sid == index_sid)
            return &mxf->index_tables[i];
    return NULL;
}

2999
/**
3000 3001 3002
 * Deal with the case where for some audio atoms EditUnitByteCount is
 * very small (2, 4..). In those cases we should read more than one
 * sample per call to mxf_read_packet().
3003
 */
3004
static void mxf_compute_edit_units_per_packet(MXFContext *mxf, AVStream *st)
3005
{
3006 3007
    MXFTrack *track = st->priv_data;
    MXFIndexTable *t;
3008

3009
    if (!track)
3010
        return;
3011 3012 3013 3014 3015
    track->edit_units_per_packet = 1;
    if (track->wrapping != ClipWrapped)
        return;

    t = mxf_find_index_table(mxf, track->index_sid);
3016 3017

    /* expect PCM with exactly one index table segment and a small (< 32) EUBC */
3018 3019
    if (st->codecpar->codec_type != AVMEDIA_TYPE_AUDIO         ||
        !is_pcm(st->codecpar->codec_id)                        ||
3020 3021 3022
        !t                                                     ||
        t->nb_segments != 1                                    ||
        t->segments[0]->edit_unit_byte_count >= 32)
3023 3024 3025
        return;

    /* arbitrarily default to 48 kHz PAL audio frame size */
3026 3027 3028
    /* TODO: We could compute this from the ratio between the audio
     *       and video edit rates for 48 kHz NTSC we could use the
     *       1802-1802-1802-1802-1801 pattern. */
3029
    track->edit_units_per_packet = FFMAX(1, track->edit_rate.num / track->edit_rate.den / 25);
3030 3031
}

3032
/**
3033
 * Deal with the case where ClipWrapped essences does not have any IndexTableSegments.
3034
 */
3035
static int mxf_handle_missing_index_segment(MXFContext *mxf, AVStream *st)
3036
{
3037
    MXFTrack *track = st->priv_data;
3038 3039 3040
    MXFIndexTableSegment *segment = NULL;
    MXFPartition *p = NULL;
    int essence_partition_count = 0;
3041
    int edit_unit_byte_count = 0;
3042 3043
    int i, ret;

3044
    if (!track || track->wrapping != ClipWrapped)
3045 3046
        return 0;

3047
    /* check if track already has an IndexTableSegment */
3048
    for (i = 0; i < mxf->metadata_sets_count; i++) {
3049 3050 3051 3052 3053
        if (mxf->metadata_sets[i]->type == IndexTableSegment) {
            MXFIndexTableSegment *s = (MXFIndexTableSegment*)mxf->metadata_sets[i];
            if (s->body_sid == track->body_sid)
                return 0;
        }
3054 3055 3056 3057 3058
    }

    /* find the essence partition */
    for (i = 0; i < mxf->partitions_count; i++) {
        /* BodySID == 0 -> no essence */
3059
        if (mxf->partitions[i].body_sid != track->body_sid)
3060 3061 3062 3063 3064 3065 3066 3067 3068 3069
            continue;

        p = &mxf->partitions[i];
        essence_partition_count++;
    }

    /* only handle files with a single essence partition */
    if (essence_partition_count != 1)
        return 0;

3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080
    if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && is_pcm(st->codecpar->codec_id)) {
        edit_unit_byte_count = (av_get_bits_per_sample(st->codecpar->codec_id) * st->codecpar->channels) >> 3;
    } else if (st->duration > 0 && p->first_essence_klv.length > 0 && p->first_essence_klv.length % st->duration == 0) {
        edit_unit_byte_count = p->first_essence_klv.length / st->duration;
    }

    if (edit_unit_byte_count <= 0)
        return 0;

    av_log(mxf->fc, AV_LOG_WARNING, "guessing index for stream %d using edit unit byte count %d\n", st->index, edit_unit_byte_count);

3081 3082 3083 3084
    if (!(segment = av_mallocz(sizeof(*segment))))
        return AVERROR(ENOMEM);

    if ((ret = mxf_add_metadata_set(mxf, segment))) {
3085
        mxf_free_metadataset((MXFMetadataSet**)&segment, 1);
3086 3087 3088
        return ret;
    }

3089 3090 3091 3092 3093
    /* Make sure we have nonzero unique index_sid, body_sid will be ok, because
     * using the same SID for index is forbidden in MXF. */
    if (!track->index_sid)
        track->index_sid = track->body_sid;

3094 3095
    segment->type = IndexTableSegment;
    /* stream will be treated as small EditUnitByteCount */
3096
    segment->edit_unit_byte_count = edit_unit_byte_count;
3097
    segment->index_start_position = 0;
3098
    segment->index_duration = st->duration;
3099
    segment->index_edit_rate = av_inv_q(st->time_base);
3100
    segment->index_sid = track->index_sid;
3101 3102 3103 3104
    segment->body_sid = p->body_sid;
    return 0;
}

3105 3106 3107 3108
static void mxf_read_random_index_pack(AVFormatContext *s)
{
    MXFContext *mxf = s->priv_data;
    uint32_t length;
3109
    int64_t file_size, max_rip_length, min_rip_length;
3110 3111
    KLVPacket klv;

3112
    if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL))
3113 3114 3115
        return;

    file_size = avio_size(s->pb);
3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131

    /* S377m says to check the RIP length for "silly" values, without defining "silly".
     * The limit below assumes a file with nothing but partition packs and a RIP.
     * Before changing this, consider that a muxer may place each sample in its own partition.
     *
     * 105 is the size of the smallest possible PartitionPack
     * 12 is the size of each RIP entry
     * 28 is the size of the RIP header and footer, assuming an 8-byte BER
     */
    max_rip_length = ((file_size - mxf->run_in) / 105) * 12 + 28;
    max_rip_length = FFMIN(max_rip_length, INT_MAX); //2 GiB and up is also silly

    /* We're only interested in RIPs with at least two entries.. */
    min_rip_length = 16+1+24+4;

    /* See S377m section 11 */
3132 3133
    avio_seek(s->pb, file_size - 4, SEEK_SET);
    length = avio_rb32(s->pb);
3134 3135

    if (length < min_rip_length || length > max_rip_length)
3136 3137 3138
        goto end;
    avio_seek(s->pb, file_size - length, SEEK_SET);
    if (klv_read_packet(&klv, s->pb) < 0 ||
3139
        !IS_KLV_KEY(klv.key, mxf_random_index_pack_key))
3140
        goto end;
3141 3142 3143 3144
    if (klv.next_klv != file_size || klv.length <= 4 || (klv.length - 4) % 12) {
        av_log(s, AV_LOG_WARNING, "Invalid RIP KLV length\n");
        goto end;
    }
3145 3146

    avio_skip(s->pb, klv.length - 12);
3147
    mxf->footer_partition = avio_rb64(s->pb);
3148

3149 3150 3151 3152 3153 3154
    /* sanity check */
    if (mxf->run_in + mxf->footer_partition >= file_size) {
        av_log(s, AV_LOG_WARNING, "bad FooterPartition in RIP - ignoring\n");
        mxf->footer_partition = 0;
    }

3155 3156 3157 3158
end:
    avio_seek(s->pb, mxf->run_in, SEEK_SET);
}

3159
static int mxf_read_header(AVFormatContext *s)
3160 3161 3162
{
    MXFContext *mxf = s->priv_data;
    KLVPacket klv;
3163
    int64_t essence_offset = 0;
3164
    int ret;
3165

3166 3167
    mxf->last_forward_tell = INT64_MAX;

3168 3169
    if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {
        av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");
3170
        //goto fail should not be needed as no metadata sets will have been parsed yet
3171
        return AVERROR_INVALIDDATA;
3172
    }
3173
    avio_seek(s->pb, -14, SEEK_CUR);
3174
    mxf->fc = s;
3175 3176
    mxf->run_in = avio_tell(s->pb);

3177 3178
    mxf_read_random_index_pack(s);

3179
    while (!avio_feof(s->pb)) {
3180
        const MXFMetadataReadTableEntry *metadata;
3181

3182 3183 3184 3185 3186 3187 3188 3189
        if (klv_read_packet(&klv, s->pb) < 0) {
            /* EOF - seek to previous partition or stop */
            if(mxf_parse_handle_partition_or_eof(mxf) <= 0)
                break;
            else
                continue;
        }

3190
        PRINT_KEY(s, "read header", klv.key);
3191
        av_log(s, AV_LOG_TRACE, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);
3192
        if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||
3193
            IS_KLV_KEY(klv.key, mxf_essence_element_key) ||
3194
            IS_KLV_KEY(klv.key, mxf_canopus_essence_element_key) ||
3195
            IS_KLV_KEY(klv.key, mxf_avid_essence_element_key) ||
3196 3197
            IS_KLV_KEY(klv.key, mxf_system_item_key_cp) ||
            IS_KLV_KEY(klv.key, mxf_system_item_key_gc)) {
3198 3199 3200

            if (!mxf->current_partition) {
                av_log(mxf->fc, AV_LOG_ERROR, "found essence prior to first PartitionPack\n");
3201 3202
                ret = AVERROR_INVALIDDATA;
                goto fail;
3203 3204
            }

3205 3206
            if (!mxf->current_partition->first_essence_klv.offset)
                mxf->current_partition->first_essence_klv = klv;
3207

3208 3209
            if (!essence_offset)
                essence_offset = klv.offset;
3210 3211 3212 3213

            /* seek to footer, previous partition or stop */
            if (mxf_parse_handle_essence(mxf) <= 0)
                break;
3214
            continue;
3215
        } else if (mxf_is_partition_pack_key(klv.key) && mxf->current_partition) {
3216 3217 3218
            /* next partition pack - keep going, seek to previous partition or stop */
            if(mxf_parse_handle_partition_or_eof(mxf) <= 0)
                break;
3219 3220 3221
            else if (mxf->parsing_backward)
                continue;
            /* we're still parsing forward. proceed to parsing this partition pack */
3222
        }
3223 3224 3225

        for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {
            if (IS_KLV_KEY(klv.key, metadata->key)) {
3226
                if ((ret = mxf_parse_klv(mxf, klv, metadata->read, metadata->ctx_size, metadata->type)) < 0)
3227
                    goto fail;
3228 3229 3230
                break;
            }
        }
3231 3232 3233
        if (!metadata->read) {
            av_log(s, AV_LOG_VERBOSE, "Dark key " PRIxUID "\n",
                            UID_ARG(klv.key));
3234
            avio_skip(s->pb, klv.length);
3235
        }
3236
    }
3237
    /* FIXME avoid seek */
3238
    if (!essence_offset)  {
3239
        av_log(s, AV_LOG_ERROR, "no essence\n");
3240 3241
        ret = AVERROR_INVALIDDATA;
        goto fail;
3242
    }
3243
    avio_seek(s->pb, essence_offset, SEEK_SET);
3244

3245 3246 3247
    /* we need to do this before computing the index tables
     * to be able to fill in zero IndexDurations with st->duration */
    if ((ret = mxf_parse_structural_metadata(mxf)) < 0)
3248
        goto fail;
3249

3250 3251 3252
    for (int i = 0; i < s->nb_streams; i++)
        mxf_handle_missing_index_segment(mxf, s->streams[i]);

3253
    if ((ret = mxf_compute_index_tables(mxf)) < 0)
3254
        goto fail;
3255 3256 3257 3258 3259

    if (mxf->nb_index_tables > 1) {
        /* TODO: look up which IndexSID to use via EssenceContainerData */
        av_log(mxf->fc, AV_LOG_INFO, "got %i index tables - only the first one (IndexSID %i) will be used\n",
               mxf->nb_index_tables, mxf->index_tables[0].index_sid);
3260
    } else if (mxf->nb_index_tables == 0 && mxf->op == OPAtom && (s->error_recognition & AV_EF_EXPLODE)) {
3261
        av_log(mxf->fc, AV_LOG_ERROR, "cannot demux OPAtom without an index\n");
3262 3263
        ret = AVERROR_INVALIDDATA;
        goto fail;
3264 3265
    }

3266 3267
    mxf_compute_essence_containers(s);

3268 3269
    for (int i = 0; i < s->nb_streams; i++)
        mxf_compute_edit_units_per_packet(mxf, s->streams[i]);
3270

3271
    return 0;
3272 3273 3274 3275
fail:
    mxf_read_close(s);

    return ret;
3276 3277
}

3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291
/* Get the edit unit of the next packet from current_offset in a track. The returned edit unit can be original_duration as well! */
static int mxf_get_next_track_edit_unit(MXFContext *mxf, MXFTrack *track, int64_t current_offset, int64_t *edit_unit_out)
{
    int64_t a, b, m, offset;
    MXFIndexTable *t = mxf_find_index_table(mxf, track->index_sid);

    if (!t || track->original_duration <= 0)
        return -1;

    a = -1;
    b = track->original_duration;

    while (b - a > 1) {
        m = (a + b) >> 1;
3292
        if (mxf_edit_unit_absolute_offset(mxf, t, m, track->edit_rate, NULL, &offset, NULL, 0) < 0)
3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304
            return -1;
        if (offset < current_offset)
            a = m;
        else
            b = m;
    }

    *edit_unit_out = b;

    return 0;
}

3305 3306
static int64_t mxf_compute_sample_count(MXFContext *mxf, AVStream *st,
                                        int64_t edit_unit)
3307 3308 3309 3310
{
    MXFTrack *track = st->priv_data;
    AVRational time_base = av_inv_q(track->edit_rate);
    AVRational sample_rate = av_inv_q(st->time_base);
3311 3312 3313 3314

    // For non-audio sample_count equals current edit unit
    if (st->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
        return edit_unit;
3315

3316 3317 3318
    if ((sample_rate.num / sample_rate.den) == 48000) {
        return av_rescale_q(edit_unit, sample_rate, track->edit_rate);
    } else {
3319 3320
        int remainder = (sample_rate.num * time_base.num) %
                        (time_base.den * sample_rate.den);
3321 3322
        if (remainder)
            av_log(mxf->fc, AV_LOG_WARNING,
3323 3324
                   "seeking detected on stream #%d with time base (%d/%d) and "
                   "sample rate (%d/%d), audio pts won't be accurate.\n",
3325
                   st->index, time_base.num, time_base.den,
3326
                   sample_rate.num, sample_rate.den);
3327
        return av_rescale_q(edit_unit, sample_rate, track->edit_rate);
3328 3329 3330
    }
}

3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346
/**
 * Make sure track->sample_count is correct based on what offset we're currently at.
 * Also determine the next edit unit (or packet) offset.
 * @return next_ofs if OK, <0 on error
 */
static int64_t mxf_set_current_edit_unit(MXFContext *mxf, AVStream *st, int64_t current_offset, int resync)
{
    int64_t next_ofs = -1;
    MXFTrack *track = st->priv_data;
    int64_t edit_unit = av_rescale_q(track->sample_count, st->time_base, av_inv_q(track->edit_rate));
    int64_t new_edit_unit;
    MXFIndexTable *t = mxf_find_index_table(mxf, track->index_sid);

    if (!t || track->wrapping == UnknownWrapped)
        return -1;

3347
    if (mxf_edit_unit_absolute_offset(mxf, t, edit_unit + track->edit_units_per_packet, track->edit_rate, NULL, &next_ofs, NULL, 0) < 0 &&
3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373
        (next_ofs = mxf_essence_container_end(mxf, t->body_sid)) <= 0) {
        av_log(mxf->fc, AV_LOG_ERROR, "unable to compute the size of the last packet\n");
        return -1;
    }

    /* check if the next edit unit offset (next_ofs) starts ahead of current_offset */
    if (next_ofs > current_offset)
        return next_ofs;

    if (!resync) {
        av_log(mxf->fc, AV_LOG_ERROR, "cannot find current edit unit for stream %d, invalid index?\n", st->index);
        return -1;
    }

    if (mxf_get_next_track_edit_unit(mxf, track, current_offset + 1, &new_edit_unit) < 0 || new_edit_unit <= 0) {
        av_log(mxf->fc, AV_LOG_ERROR, "failed to find next track edit unit in stream %d\n", st->index);
        return -1;
    }

    new_edit_unit--;
    track->sample_count = mxf_compute_sample_count(mxf, st, new_edit_unit);
    av_log(mxf->fc, AV_LOG_WARNING, "edit unit sync lost on stream %d, jumping from %"PRId64" to %"PRId64"\n", st->index, edit_unit, new_edit_unit);

    return mxf_set_current_edit_unit(mxf, st, current_offset, 0);
}

3374
static int mxf_set_audio_pts(MXFContext *mxf, AVCodecParameters *par,
3375
                             AVPacket *pkt)
3376
{
3377 3378
    AVStream *st = mxf->fc->streams[pkt->stream_index];
    MXFTrack *track = st->priv_data;
3379
    int64_t bits_per_sample = par->bits_per_coded_sample;
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Luca Barbato committed
3380 3381

    if (!bits_per_sample)
3382
        bits_per_sample = av_get_bits_per_sample(par->codec_id);
3383

3384
    pkt->pts = track->sample_count;
3385

3386
    if (   par->channels <= 0
3387
        || bits_per_sample <= 0
3388
        || par->channels * (int64_t)bits_per_sample < 8)
3389 3390 3391 3392
        track->sample_count = mxf_compute_sample_count(mxf, st, av_rescale_q(track->sample_count, st->time_base, av_inv_q(track->edit_rate)) + 1);
    else
        track->sample_count += pkt->size / (par->channels * (int64_t)bits_per_sample / 8);

3393 3394 3395
    return 0;
}

3396
static int mxf_set_pts(MXFContext *mxf, AVStream *st, AVPacket *pkt)
3397 3398 3399 3400
{
    AVCodecParameters *par = st->codecpar;
    MXFTrack *track = st->priv_data;

3401 3402 3403
    if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
        /* see if we have an index table to derive timestamps from */
        MXFIndexTable *t = mxf_find_index_table(mxf, track->index_sid);
3404

3405 3406 3407
        if (t && track->sample_count < t->nb_ptses) {
            pkt->dts = track->sample_count + t->first_dts;
            pkt->pts = t->ptses[track->sample_count];
3408
        } else if (track->intra_only) {
3409 3410
            /* intra-only -> PTS = EditUnit.
             * let utils.c figure out DTS since it can be < PTS if low_delay = 0 (Sony IMX30) */
3411
            pkt->pts = track->sample_count;
3412
        }
3413
        track->sample_count++;
3414 3415 3416 3417
    } else if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
        int ret = mxf_set_audio_pts(mxf, par, pkt);
        if (ret < 0)
            return ret;
3418
    } else if (track) {
3419 3420
        pkt->dts = pkt->pts = track->sample_count;
        pkt->duration = 1;
3421
        track->sample_count++;
3422 3423 3424 3425
    }
    return 0;
}

3426
static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)
3427 3428
{
    KLVPacket klv;
3429
    MXFContext *mxf = s->priv_data;
3430
    int ret;
3431

3432 3433 3434 3435 3436
    while (1) {
        int64_t max_data_size;
        int64_t pos = avio_tell(s->pb);

        if (pos < mxf->current_klv_data.next_klv - mxf->current_klv_data.length || pos >= mxf->current_klv_data.next_klv) {
3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451
            mxf->current_klv_data = (KLVPacket){{0}};
            ret = klv_read_packet(&klv, s->pb);
            if (ret < 0)
                break;
            max_data_size = klv.length;
            pos = klv.next_klv - klv.length;
            PRINT_KEY(s, "read packet", klv.key);
            av_log(s, AV_LOG_TRACE, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);
            if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {
                ret = mxf_decrypt_triplet(s, pkt, &klv);
                if (ret < 0) {
                    av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");
                    return ret;
                }
                return 0;
3452
            }
3453 3454 3455 3456
        } else {
            klv = mxf->current_klv_data;
            max_data_size = klv.next_klv - pos;
        }
3457
        if (IS_KLV_KEY(klv.key, mxf_essence_element_key) ||
3458
            IS_KLV_KEY(klv.key, mxf_canopus_essence_element_key) ||
3459
            IS_KLV_KEY(klv.key, mxf_avid_essence_element_key)) {
3460
            int body_sid = find_body_sid_by_absolute_offset(mxf, klv.offset);
3461
            int index = mxf_get_stream_index(s, &klv, body_sid);
3462
            int64_t next_ofs;
3463
            AVStream *st;
3464
            MXFTrack *track;
3465

3466
            if (index < 0) {
3467 3468 3469
                av_log(s, AV_LOG_ERROR,
                       "error getting stream index %"PRIu32"\n",
                       AV_RB32(klv.key + 12));
3470 3471
                goto skip;
            }
3472 3473

            st = s->streams[index];
3474
            track = st->priv_data;
3475

3476 3477
            if (s->streams[index]->discard == AVDISCARD_ALL)
                goto skip;
3478

3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493
            next_ofs = mxf_set_current_edit_unit(mxf, st, pos, 1);

            if (track->wrapping != FrameWrapped) {
                int64_t size;

                if (next_ofs <= 0) {
                    // If we have no way to packetize the data, then return it in chunks...
                    if (klv.next_klv - klv.length == pos && max_data_size > MXF_MAX_CHUNK_SIZE) {
                        st->need_parsing = AVSTREAM_PARSE_FULL;
                        avpriv_request_sample(s, "Huge KLV without proper index in non-frame wrapped essence");
                    }
                    size = FFMIN(max_data_size, MXF_MAX_CHUNK_SIZE);
                } else {
                    if ((size = next_ofs - pos) <= 0) {
                        av_log(s, AV_LOG_ERROR, "bad size: %"PRId64"\n", size);
3494 3495
                        mxf->current_klv_data = (KLVPacket){{0}};
                        return AVERROR_INVALIDDATA;
3496 3497 3498 3499 3500 3501 3502 3503 3504 3505
                    }
                    // We must not overread, because the next edit unit might be in another KLV
                    if (size > max_data_size)
                        size = max_data_size;
                }

                mxf->current_klv_data = klv;
                klv.offset = pos;
                klv.length = size;
                klv.next_klv = klv.offset + klv.length;
3506 3507
            }

3508 3509
            /* check for 8 channels AES3 element */
            if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {
3510 3511 3512
                ret = mxf_get_d10_aes3_packet(s->pb, s->streams[index],
                                              pkt, klv.length);
                if (ret < 0) {
3513
                    av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");
3514
                    mxf->current_klv_data = (KLVPacket){{0}};
3515
                    return ret;
3516
                }
3517 3518 3519 3520 3521 3522 3523
            } else if (mxf->eia608_extract &&
                       s->streams[index]->codecpar->codec_id == AV_CODEC_ID_EIA_608) {
                ret = mxf_get_eia608_packet(s, s->streams[index], pkt, klv.length);
                if (ret < 0) {
                    mxf->current_klv_data = (KLVPacket){{0}};
                    return ret;
                }
3524
            } else {
3525
                ret = av_get_packet(s->pb, pkt, klv.length);
3526 3527
                if (ret < 0) {
                    mxf->current_klv_data = (KLVPacket){{0}};
3528
                    return ret;
3529
                }
3530 3531 3532
            }
            pkt->stream_index = index;
            pkt->pos = klv.offset;
3533

3534 3535 3536
            ret = mxf_set_pts(mxf, st, pkt);
            if (ret < 0) {
                mxf->current_klv_data = (KLVPacket){{0}};
3537
                return ret;
3538
            }
3539 3540

            /* seek for truncated packets */
3541
            avio_seek(s->pb, klv.next_klv, SEEK_SET);
3542

3543
            return 0;
3544
        } else {
3545
        skip:
3546 3547 3548
            avio_skip(s->pb, max_data_size);
            mxf->current_klv_data = (KLVPacket){{0}};
        }
3549
    }
3550
    return avio_feof(s->pb) ? AVERROR_EOF : ret;
3551 3552
}

3553 3554 3555
static int mxf_read_close(AVFormatContext *s)
{
    MXFContext *mxf = s->priv_data;
3556
    int i;
3557 3558

    av_freep(&mxf->packages_refs);
3559
    av_freep(&mxf->essence_container_data_refs);
3560 3561 3562 3563

    for (i = 0; i < s->nb_streams; i++)
        s->streams[i]->priv_data = NULL;

3564
    for (i = 0; i < mxf->metadata_sets_count; i++) {
3565
        mxf_free_metadataset(mxf->metadata_sets + i, 1);
3566
    }
3567
    mxf->metadata_sets_count = 0;
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Tomas Härdin committed
3568
    av_freep(&mxf->partitions);
3569 3570 3571
    av_freep(&mxf->metadata_sets);
    av_freep(&mxf->aesc);
    av_freep(&mxf->local_tags);
3572

3573 3574 3575 3576 3577
    if (mxf->index_tables) {
        for (i = 0; i < mxf->nb_index_tables; i++) {
            av_freep(&mxf->index_tables[i].segments);
            av_freep(&mxf->index_tables[i].ptses);
            av_freep(&mxf->index_tables[i].fake_index);
3578
            av_freep(&mxf->index_tables[i].offsets);
3579
        }
3580
    }
3581 3582
    av_freep(&mxf->index_tables);

3583 3584 3585
    return 0;
}

3586
static int mxf_probe(const AVProbeData *p) {
3587 3588
    const uint8_t *bufp = p->buf;
    const uint8_t *end = p->buf + p->buf_size;
3589 3590 3591 3592 3593 3594

    if (p->buf_size < sizeof(mxf_header_partition_pack_key))
        return 0;

    /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */
    end -= sizeof(mxf_header_partition_pack_key);
3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605

    for (; bufp < end;) {
        if (!((bufp[13] - 1) & 0xF2)){
            if (AV_RN32(bufp   ) == AV_RN32(mxf_header_partition_pack_key   ) &&
                AV_RN32(bufp+ 4) == AV_RN32(mxf_header_partition_pack_key+ 4) &&
                AV_RN32(bufp+ 8) == AV_RN32(mxf_header_partition_pack_key+ 8) &&
                AV_RN16(bufp+12) == AV_RN16(mxf_header_partition_pack_key+12))
                return AVPROBE_SCORE_MAX;
            bufp ++;
        } else
            bufp += 10;
3606
    }
3607

3608 3609 3610 3611 3612 3613 3614 3615 3616
    return 0;
}

/* rudimentary byte seek */
/* XXX: use MXF Index */
static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
{
    AVStream *st = s->streams[stream_index];
    int64_t seconds;
3617 3618
    MXFContext* mxf = s->priv_data;
    int64_t seekpos;
3619
    int i, ret;
3620
    MXFIndexTable *t;
3621 3622
    MXFTrack *source_track = st->priv_data;

3623
    if (!source_track)
3624 3625
        return 0;

3626
    /* if audio then truncate sample_time to EditRate */
3627
    if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO)
3628 3629
        sample_time = av_rescale_q(sample_time, st->time_base,
                                   av_inv_q(source_track->edit_rate));
3630

3631
    if (mxf->nb_index_tables <= 0) {
3632 3633 3634 3635 3636
        if (!s->bit_rate)
            return AVERROR_INVALIDDATA;
        if (sample_time < 0)
            sample_time = 0;
        seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);
3637

3638 3639 3640
        seekpos = avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);
        if (seekpos < 0)
            return seekpos;
3641

3642
        ff_update_cur_dts(s, st, sample_time);
3643
        mxf->current_klv_data = (KLVPacket){{0}};
3644
    } else {
3645 3646
        MXFPartition *partition;

3647
        t = &mxf->index_tables[0];
3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661
        if (t->index_sid != source_track->index_sid) {
            /* If the first index table does not belong to the stream, then find a stream which does belong to the index table */
            for (i = 0; i < s->nb_streams; i++) {
                MXFTrack *new_source_track = s->streams[i]->priv_data;
                if (new_source_track && new_source_track->index_sid == t->index_sid) {
                    sample_time = av_rescale_q(sample_time, new_source_track->edit_rate, source_track->edit_rate);
                    source_track = new_source_track;
                    st = s->streams[i];
                    break;
                }
            }
            if (i == s->nb_streams)
                return AVERROR_INVALIDDATA;
        }
3662

3663 3664 3665
        /* clamp above zero, else ff_index_search_timestamp() returns negative
         * this also means we allow seeking before the start */
        sample_time = FFMAX(sample_time, 0);
3666

3667
        if (t->fake_index) {
3668 3669 3670 3671 3672 3673 3674 3675 3676 3677
            /* The first frames may not be keyframes in presentation order, so
             * we have to advance the target to be able to find the first
             * keyframe backwards... */
            if (!(flags & AVSEEK_FLAG_ANY) &&
                (flags & AVSEEK_FLAG_BACKWARD) &&
                t->ptses[0] != AV_NOPTS_VALUE &&
                sample_time < t->ptses[0] &&
                (t->fake_index[t->ptses[0]].flags & AVINDEX_KEYFRAME))
                sample_time = t->ptses[0];

3678 3679 3680
            /* behave as if we have a proper index */
            if ((sample_time = ff_index_search_timestamp(t->fake_index, t->nb_ptses, sample_time, flags)) < 0)
                return sample_time;
3681 3682
            /* get the stored order index from the display order index */
            sample_time += t->offsets[sample_time];
3683 3684 3685
        } else {
            /* no IndexEntryArray (one or more CBR segments)
             * make sure we don't seek past the end */
3686
            sample_time = FFMIN(sample_time, source_track->original_duration - 1);
3687 3688
        }

3689 3690 3691
        if (source_track->wrapping == UnknownWrapped)
            av_log(mxf->fc, AV_LOG_WARNING, "attempted seek in an UnknownWrapped essence\n");

3692
        if ((ret = mxf_edit_unit_absolute_offset(mxf, t, sample_time, source_track->edit_rate, &sample_time, &seekpos, &partition, 1)) < 0)
3693 3694
            return ret;

3695
        ff_update_cur_dts(s, st, sample_time);
3696 3697 3698 3699 3700 3701 3702 3703 3704 3705
        if (source_track->wrapping == ClipWrapped) {
            KLVPacket klv = partition->first_essence_klv;
            if (seekpos < klv.next_klv - klv.length || seekpos >= klv.next_klv) {
                av_log(mxf->fc, AV_LOG_ERROR, "attempted seek out of clip wrapped KLV\n");
                return AVERROR_INVALIDDATA;
            }
            mxf->current_klv_data = klv;
        } else {
            mxf->current_klv_data = (KLVPacket){{0}};
        }
3706 3707
        avio_seek(s->pb, seekpos, SEEK_SET);
    }
3708 3709 3710 3711 3712

    // Update all tracks sample count
    for (i = 0; i < s->nb_streams; i++) {
        AVStream *cur_st = s->streams[i];
        MXFTrack *cur_track = cur_st->priv_data;
3713 3714 3715 3716 3717
        if (cur_track) {
            int64_t track_edit_unit = sample_time;
            if (st != cur_st)
                mxf_get_next_track_edit_unit(mxf, cur_track, seekpos, &track_edit_unit);
            cur_track->sample_count = mxf_compute_sample_count(mxf, cur_st, track_edit_unit);
3718 3719
        }
    }
3720 3721 3722
    return 0;
}

3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737
static const AVOption options[] = {
    { "eia608_extract", "extract eia 608 captions from s436m track",
      offsetof(MXFContext, eia608_extract), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1,
      AV_OPT_FLAG_DECODING_PARAM },
    { NULL },
};

static const AVClass demuxer_class = {
    .class_name = "mxf",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
    .category   = AV_CLASS_CATEGORY_DEMUXER,
};

3738
AVInputFormat ff_mxf_demuxer = {
3739
    .name           = "mxf",
3740
    .long_name      = NULL_IF_CONFIG_SMALL("MXF (Material eXchange Format)"),
3741
    .flags          = AVFMT_SEEK_TO_PTS,
3742 3743 3744
    .priv_data_size = sizeof(MXFContext),
    .read_probe     = mxf_probe,
    .read_header    = mxf_read_header,
3745
    .read_packet    = mxf_read_packet,
3746 3747
    .read_close     = mxf_read_close,
    .read_seek      = mxf_read_seek,
3748
    .priv_class     = &demuxer_class,
3749
};