mxfdec.c 99.6 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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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * 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.
 *
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 * Libav is distributed in the hope that it will be useful,
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 * 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
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 * License along with Libav; if not, write to the Free Software
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 * 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/mathematics.h"
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#include "libavcodec/bytestream.h"
#include "avformat.h"
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#include "internal.h"
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#include "mxf.h"
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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 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
    int64_t essence_length;
    int32_t kag_size;
    int64_t header_byte_count;
    int64_t index_byte_count;
    int pack_length;
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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;
    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 MXFTrack {
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    UID uid;
    enum MXFMetadataSetType type;
    MXFSequence *sequence; /* mandatory, and only one */
    UID sequence_ref;
    int track_id;
    uint8_t track_number[4];
    AVRational edit_rate;
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    int intra_only;
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    uint64_t sample_count;
    int64_t original_duration; /* st->duration in SampleRate/EditRate units */
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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;
    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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#define MXF_TFF 1
#define MXF_BFF 2
    int field_dominance;
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    int channels;
    int bits_per_sample;
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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;
    UID *tracks_refs;
    int tracks_count;
    MXFDescriptor *descriptor; /* only one */
    UID descriptor_ref;
} MXFPackage;

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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 */
    AVIndexEntry *fake_index;   /* used for calling ff_index_search_timestamp() */
} MXFIndexTable;

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typedef struct MXFContext {
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    MXFPartition *partitions;
    unsigned partitions_count;
    MXFOP op;
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    UID *packages_refs;
    int packages_count;
    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 last_partition;
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    uint64_t footer_partition;
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    KLVPacket current_klv_data;
    int current_klv_index;
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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 current_edit_unit;
    int nb_index_tables;
    MXFIndexTable *index_tables;
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    int edit_units_per_packet;      ///< how many edit units to read at a time (PCM, OPAtom)
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} MXFContext;

enum MXFWrappingScheme {
    Frame,
    Clip,
};

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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;

/* 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_system_item_key[]                 = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x03,0x01,0x04 };
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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 };

#define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y)))

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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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    }
    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 && !pb->eof_reached; 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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{
    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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    klv->length = klv_decode_ber_length(pb);
    return klv->length == -1 ? -1 : 0;
}

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

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

/* 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->codec->channels * 4; ) {
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        for (i = 0; i < st->codec->channels; i++) {
            uint32_t sample = bytestream_get_le32(&buf_ptr);
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            if (st->codec->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);
        }
        buf_ptr += 32 - st->codec->channels*4; // always 8 channels stored SMPTE 331M
    }
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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;

    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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    avio_skip(pb, klv_decode_ber_length(pb));
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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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    index = mxf_get_stream_index(s, klv);
    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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    }
    if (item_num > UINT_MAX / item_len)
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        return AVERROR_INVALIDDATA;
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    mxf->local_tags_count = item_num;
    mxf->local_tags = av_malloc(item_num*item_len);
    if (!mxf->local_tags)
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        return AVERROR(ENOMEM);
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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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    MXFPartition *partition;
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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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    int err;
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    if ((err = av_reallocp_array(&mxf->partitions, mxf->partitions_count + 1,
                                 sizeof(*mxf->partitions))) < 0) {
        mxf->partitions_count = 0;
        return err;
    }
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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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    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);
    avio_skip(pb, 8);
    partition->body_sid = avio_rb32(pb);
    avio_read(pb, op, sizeof(UID));
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    nb_essence_containers = avio_rb32(pb);
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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'thave FooterPartition set in every partition */
    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 */
    if (partition->previous_partition &&
        mxf->run_in + partition->previous_partition >= klv_offset) {
        av_log(mxf->fc, AV_LOG_ERROR,
               "PreviousPartition points to this partition or forward\n");
        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)
                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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    int err;

    if ((err = av_reallocp_array(&mxf->metadata_sets, mxf->metadata_sets_count + 1,
                                 sizeof(*mxf->metadata_sets))) < 0) {
        mxf->metadata_sets_count = 0;
        return err;
    }
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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_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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        mxf->packages_count = avio_rb32(pb);
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        if (mxf->packages_count >= UINT_MAX / sizeof(UID))
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            return AVERROR_INVALIDDATA;
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        mxf->packages_refs = av_malloc(mxf->packages_count * sizeof(UID));
        if (!mxf->packages_refs)
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            return AVERROR(ENOMEM);
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        avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */
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        avio_read(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID));
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        break;
    }
    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_skip(pb, 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_material_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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        package->tracks_count = avio_rb32(pb);
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        if (package->tracks_count >= UINT_MAX / sizeof(UID))
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            return AVERROR_INVALIDDATA;
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        package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
        if (!package->tracks_refs)
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            return AVERROR(ENOMEM);
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        avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */
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        avio_read(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
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        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 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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        sequence->structural_components_count = avio_rb32(pb);
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        if (sequence->structural_components_count >= UINT_MAX / sizeof(UID))
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            return AVERROR_INVALIDDATA;
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        sequence->structural_components_refs = av_malloc(sequence->structural_components_count * sizeof(UID));
        if (!sequence->structural_components_refs)
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            return AVERROR(ENOMEM);
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        avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */
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        avio_read(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID));
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        break;
    }
    return 0;
}

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static int mxf_read_source_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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        package->tracks_count = avio_rb32(pb);
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        if (package->tracks_count >= UINT_MAX / sizeof(UID))
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            return AVERROR_INVALIDDATA;
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        package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
        if (!package->tracks_refs)
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            return AVERROR(ENOMEM);
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        avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */
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        avio_read(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
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        break;
    case 0x4401:
        /* UMID, only get last 16 bytes */
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        avio_skip(pb, 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;
    }
    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);
    if (!segment->nb_index_entries)
        return 0;
    else if (segment->nb_index_entries < 0 ||
             segment->nb_index_entries >
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             (INT_MAX / sizeof(*segment->stream_offset_entries)))
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        return AVERROR(ENOMEM);

    length = avio_rb32(pb);

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    segment->temporal_offset_entries = av_mallocz(segment->nb_index_entries *
                                 sizeof(*segment->temporal_offset_entries));
    segment->flag_entries            = av_mallocz(segment->nb_index_entries *
                                 sizeof(*segment->flag_entries));
    segment->stream_offset_entries   = av_mallocz(segment->nb_index_entries *
                                 sizeof(*segment->stream_offset_entries));

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    if (!segment->flag_entries || !segment->stream_offset_entries ||
        !segment->temporal_offset_entries) {
        av_freep(&segment->flag_entries);
        av_freep(&segment->stream_offset_entries);
        av_freep(&segment->temporal_offset_entries);
        return AVERROR(ENOMEM);
    }
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    for (i = 0; i < segment->nb_index_entries; i++) {
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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)
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{
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    int code, value, ofs = 0;
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    char layout[16] = {0};
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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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        }
    } 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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    descriptor->pix_fmt = AV_PIX_FMT_NONE;
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    switch(tag) {
    case 0x3F01:
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        descriptor->sub_descriptors_count = avio_rb32(pb);
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        if (descriptor->sub_descriptors_count >= UINT_MAX / sizeof(UID))
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            return AVERROR_INVALIDDATA;
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        descriptor->sub_descriptors_refs = av_malloc(descriptor->sub_descriptors_count * sizeof(UID));
        if (!descriptor->sub_descriptors_refs)
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            return AVERROR(ENOMEM);
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        avio_skip(pb, 4); /* useless size of objects, always 16 according to specs */
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        avio_read(pb, (uint8_t *)descriptor->sub_descriptors_refs, descriptor->sub_descriptors_count * sizeof(UID));
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        break;
    case 0x3004:
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        avio_read(pb, descriptor->essence_container_ul, 16);
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        break;
    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 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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            av_free(descriptor->extradata);
            descriptor->extradata_size = 0;
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            descriptor->extradata = av_malloc(size + AV_INPUT_BUFFER_PADDING_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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        }
        break;
    }
    return 0;
}

/*
 * 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,0x34,0x04,0x01,0x01,0x02,0x0d,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, AV_CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */
    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0d,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    AV_CODEC_ID_DVVIDEO }, /* DV 625 25mbps */
    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0d,0x01,0x03,0x01,0x02,0x05,0x00,0x00 }, 14,   AV_CODEC_ID_RAWVIDEO }, /* 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 */
    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 }, 14,   AV_CODEC_ID_JPEG2000 }, /* JPEG2000 Codestream */
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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_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 }, /* BWF Frame wrapped */
    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x02,0x0d,0x01,0x03,0x01,0x02,0x04,0x40,0x01 }, 14,       AV_CODEC_ID_MP2 }, /* MPEG-ES Frame wrapped, 0x40 ??? stream id */
    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0d,0x01,0x03,0x01,0x02,0x01,0x01,0x01 }, 14, AV_CODEC_ID_PCM_S16LE }, /* D-10 Mapping 50Mbps PAL Extended Template */
    { { 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 }, /* MPEG2 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[] = {
    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x09,0x0d,0x01,0x03,0x01,0x02,0x0e,0x00,0x00 }, 16, 0 },
    { { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x09,0x0d,0x01,0x03,0x01,0x02,0x0e,0x00,0x00 }, 16, AV_CODEC_ID_NONE },
};

static const char* mxf_data_essence_descriptor[] = {
    "vbi_vanc_smpte_436M",
};

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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++;

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    if (!nb_segments)
        return AVERROR_INVALIDDATA;

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    *sorted_segments  = av_mallocz(nb_segments * sizeof(**sorted_segments));
    unsorted_segments = av_mallocz(nb_segments * sizeof(*unsorted_segments));
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    if (!*sorted_segments || !unsorted_segments) {
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        av_freep(sorted_segments);
        av_free(unsorted_segments);
        return AVERROR(ENOMEM);
    }

    for (i = j = 0; i < mxf->metadata_sets_count; i++)
        if (mxf->metadata_sets[i]->type == IndexTableSegment)
            unsorted_segments[j++] = (MXFIndexTableSegment*)mxf->metadata_sets[i];

    *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;
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        uint64_t best_index_duration = 0;
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        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.
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             * If we come across an entry with the same IndexStartPosition but larger IndexDuration, then we'll prefer it over the one we currently have.
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             */
            if ((i == 0     || s->body_sid > last_body_sid || s->index_sid > last_index_sid || s->index_start_position > last_index_start) &&
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                (best == -1 || s->body_sid < best_body_sid || s->index_sid < best_index_sid || s->index_start_position < best_index_start ||
                (s->index_start_position == best_index_start && s->index_duration > best_index_duration))) {
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                best             = j;
                best_body_sid    = s->body_sid;
                best_index_sid   = s->index_sid;
                best_index_start = s->index_start_position;
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                best_index_duration = s->index_duration;
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            }
        }

        /* 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;
}

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/**
 * Computes the absolute file offset of the given essence container offset
 */
static int mxf_absolute_bodysid_offset(MXFContext *mxf, int body_sid, int64_t offset, int64_t *offset_out)
{
    int x;
    int64_t offset_in = offset;     /* for logging */

    for (x = 0; x < mxf->partitions_count; x++) {
        MXFPartition *p = &mxf->partitions[x];

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

        if (offset < p->essence_length || !p->essence_length) {
            *offset_out = p->essence_offset + offset;
            return 0;
        }

        offset -= p->essence_length;
    }

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    av_log(mxf->fc, AV_LOG_ERROR,
           "failed to find absolute offset of %"PRIX64" in BodySID %i - partial file?\n",
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           offset_in, body_sid);

    return AVERROR_INVALIDDATA;
}

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/**
 * 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)
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{
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    int x;
    int64_t ret = 0;
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    for (x = 0; x < mxf->partitions_count; x++) {
        MXFPartition *p = &mxf->partitions[x];

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

        if (!p->essence_length)
            return 0;

        ret = p->essence_offset + p->essence_length;
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    }
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    return ret;
}
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/* EditUnit -> absolute offset */
static int mxf_edit_unit_absolute_offset(MXFContext *mxf, MXFIndexTable *index_table, int64_t edit_unit, int64_t *edit_unit_out, int64_t *offset_out, int nag)
{
    int i;
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    int64_t offset_temp = 0;
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    for (i = 0; i < index_table->nb_segments; i++) {
        MXFIndexTableSegment *s = index_table->segments[i];
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1115
        edit_unit = FFMAX(edit_unit, s->index_start_position);  /* clamp if trying to seek before start */
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        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;
            else if (s->nb_index_entries) {
                if (s->nb_index_entries == 2 * s->index_duration + 1)
                    index *= 2;     /* Avid index */

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                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;
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                }

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                offset_temp = s->stream_offset_entries[index];
            } else {
                av_log(mxf->fc, AV_LOG_ERROR, "IndexSID %i segment at %"PRId64" missing EditUnitByteCount and IndexEntryArray\n",
                       index_table->index_sid, s->index_start_position);
                return AVERROR_INVALIDDATA;
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            }
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            if (edit_unit_out)
                *edit_unit_out = edit_unit;
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            return mxf_absolute_bodysid_offset(mxf, index_table->body_sid, offset_temp, offset_out);
        } else {
            /* EditUnitByteCount == 0 for VBR indexes, which is fine since they use explicit StreamOffsets */
            offset_temp += s->edit_unit_byte_count * s->index_duration;
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        }
    }

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    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;
}

static int mxf_compute_ptses_fake_index(MXFContext *mxf, MXFIndexTable *index_table)
{
    int i, j, x;
    int8_t max_temporal_offset = -128;

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

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        if (!s->nb_index_entries) {
            index_table->nb_ptses = 0;
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            return 0;                               /* no TemporalOffsets */
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        }
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        index_table->nb_ptses += s->index_duration;
    }

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

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    if (index_table->nb_ptses > INT_MAX / sizeof(AVIndexEntry))
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        return AVERROR(ENOMEM);

    index_table->ptses      = av_mallocz(index_table->nb_ptses *
                                         sizeof(int64_t));
    index_table->fake_index = av_mallocz(index_table->nb_ptses *
                                         sizeof(AVIndexEntry));
    if (!index_table->ptses || !index_table->fake_index) {
        av_freep(&index_table->ptses);
        return AVERROR(ENOMEM);
    }

    /* we may have a few bad TemporalOffsets
     * make sure the corresponding PTSes don't have the bogus value 0 */
    for (x = 0; x < index_table->nb_ptses; x++)
        index_table->ptses[x] = AV_NOPTS_VALUE;

    /**
     * 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.
     */
    for (i = x = 0; i < index_table->nb_segments; i++) {
        MXFIndexTableSegment *s = index_table->segments[i];
        int index_delta = 1;
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        int n = s->nb_index_entries;
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        if (s->nb_index_entries == 2 * s->index_duration + 1) {
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            index_delta = 2;    /* Avid index */
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            /* ignore the last entry - it's the size of the essence container */
            n--;
        }
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        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;

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

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            index_table->fake_index[x].timestamp = x;
            index_table->fake_index[x].flags = !(s->flag_entries[j] & 0x30) ? AVINDEX_KEYFRAME : 0;

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

            index_table->ptses[index] = x;
            max_temporal_offset = FFMAX(max_temporal_offset, offset);
        }
    }

    index_table->first_dts = -max_temporal_offset;
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    return 0;
}

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/**
 * Sorts and collects index table segments into index tables.
 * Also computes PTSes if possible.
 */
static int mxf_compute_index_tables(MXFContext *mxf)
{
    int i, j, k, ret, nb_sorted_segments;
    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
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    mxf->index_tables = av_mallocz_array(mxf->nb_index_tables,
                                         sizeof(*mxf->index_tables));
    if (!mxf->index_tables) {
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        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];

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

        if (!t->segments) {
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            av_log(mxf->fc, AV_LOG_ERROR, "failed to allocate IndexTableSegment"
                   " pointer array\n");
            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;

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

        /* fix zero IndexDurations */
        for (k = 0; k < t->nb_segments; k++) {
            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);

            if (mxf->fc->nb_streams <= 0) {
                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)
             */
            t->segments[k]->index_duration = mxf->fc->streams[0]->duration;
            break;
        }
    }

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

1358 1359 1360
static int mxf_is_intra_only(MXFDescriptor *d)
{
    return mxf_get_codec_ul(mxf_intra_only_essence_container_uls,
1361
                            &d->essence_container_ul)->id != AV_CODEC_ID_NONE ||
1362
           mxf_get_codec_ul(mxf_intra_only_picture_essence_coding_uls,
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                            &d->essence_codec_ul)->id     != AV_CODEC_ID_NONE;
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}

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static int mxf_parse_structural_metadata(MXFContext *mxf)
{
    MXFPackage *material_package = NULL;
    MXFPackage *temp_package = NULL;
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    int i, j, k, ret;
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    av_log(mxf->fc, AV_LOG_TRACE, "metadata sets count %d\n", mxf->metadata_sets_count);
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    /* 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");
1380
        return AVERROR_INVALIDDATA;
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    }

    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;
        UID *essence_container_ul = NULL;
        const MXFCodecUL *codec_ul = NULL;
        const MXFCodecUL *container_ul = NULL;
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        const MXFCodecUL *pix_fmt_ul = NULL;
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        AVStream *st;

        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;
        }

        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");
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            continue;
1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422
        }

        /* TODO: handle multiple source clips */
        for (j = 0; j < material_track->sequence->structural_components_count; j++) {
            /* TODO: handle timecode component */
            component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);
            if (!component)
                continue;

            for (k = 0; k < mxf->packages_count; k++) {
                temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);
                if (!temp_package)
                    continue;
                if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {
                    source_package = temp_package;
                    break;
                }
            }
            if (!source_package) {
1423
                av_log(mxf->fc, AV_LOG_TRACE, "material track %d: no corresponding source package found\n", material_track->track_id);
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                break;
            }
            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");
1429 1430
                    ret = AVERROR_INVALIDDATA;
                    goto fail_and_free;
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                }
                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;
            }
        }
1442
        if (!source_track || !component)
1443 1444
            continue;

1445 1446
        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");
1447 1448
            ret = AVERROR_INVALIDDATA;
            goto fail_and_free;
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        }

        /* 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;
        }

1458
        st = avformat_new_stream(mxf->fc, NULL);
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        if (!st) {
            av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");
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            ret = AVERROR(ENOMEM);
            goto fail_and_free;
1463
        }
1464
        st->id = source_track->track_id;
1465
        st->priv_data = source_track;
1466
        source_track->original_duration = st->duration = component->duration;
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        if (st->duration == -1)
            st->duration = AV_NOPTS_VALUE;
        st->start_time = component->start_position;
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        if (material_track->edit_rate.num <= 0 ||
            material_track->edit_rate.den <= 0) {
            av_log(mxf->fc, AV_LOG_WARNING,
                   "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);
            material_track->edit_rate = (AVRational){25, 1};
        }
1479
        avpriv_set_pts_info(st, 64, material_track->edit_rate.den, material_track->edit_rate.num);
1480

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

1485
        PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);
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        codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);
        st->codec->codec_type = codec_ul->id;
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        source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);
        if (source_package->descriptor) {
            if (source_package->descriptor->type == MultipleDescriptor) {
                for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {
                    MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], 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 == source_track->track_id) {
                        descriptor = sub_descriptor;
                        break;
                    }
                }
            } else if (source_package->descriptor->type == Descriptor)
                descriptor = source_package->descriptor;
        }
        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;
        /* 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;
                }
            }
        }
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        /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */
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        codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);
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        st->codec->codec_id = codec_ul->id;
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        if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
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            source_track->intra_only = mxf_is_intra_only(descriptor);
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            container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, essence_container_ul);
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            if (st->codec->codec_id == AV_CODEC_ID_NONE)
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                st->codec->codec_id = container_ul->id;
            st->codec->width = descriptor->width;
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            /* Field height, not frame height */
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            st->codec->height = descriptor->height;
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            switch (descriptor->frame_layout) {
                case SegmentedFrame:
                    /* This one is a weird layout I don't fully understand. */
                    av_log(mxf->fc, AV_LOG_INFO,
                           "SegmentedFrame layout isn't currently supported\n");
                    break;
                case FullFrame:
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                    st->codec->field_order = AV_FIELD_PROGRESSIVE;
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                    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 SeparateFields:
                case MixedFields:
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                    switch (descriptor->field_dominance) {
                    case MXF_TFF:
                        st->codec->field_order = AV_FIELD_TT;
                        break;
                    case MXF_BFF:
                        st->codec->field_order = AV_FIELD_BB;
                        break;
                    default:
                        avpriv_request_sample(mxf->fc,
                                              "Field dominance %d support",
                                              descriptor->field_dominance);
                        break;
                    }
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                    /* Turn field height into frame height. */
                    st->codec->height *= 2;
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                    break;
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                default:
                    av_log(mxf->fc, AV_LOG_INFO,
                           "Unknown frame layout type: %d\n",
                           descriptor->frame_layout);
            }
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            if (st->codec->codec_id == AV_CODEC_ID_RAWVIDEO) {
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                st->codec->pix_fmt = descriptor->pix_fmt;
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                if (st->codec->pix_fmt == AV_PIX_FMT_NONE) {
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                    pix_fmt_ul = mxf_get_codec_ul(ff_mxf_pixel_format_uls,
                                                  &descriptor->essence_codec_ul);
                    st->codec->pix_fmt = pix_fmt_ul->id;
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                    if (st->codec->pix_fmt == AV_PIX_FMT_NONE) {
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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->codec->pix_fmt = AV_PIX_FMT_UYVY422;
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                        }
                    }
                }
            }
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            st->need_parsing = AVSTREAM_PARSE_HEADERS;
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            if (material_track->sequence->origin) {
                char material_origin[3];
                snprintf(material_origin, sizeof(material_origin), "%d", material_track->sequence->origin);
                av_dict_set(&st->metadata, "material_track_origin", material_origin, 0);
            }
            if (source_track->sequence->origin) {
                char source_origin[3];
                snprintf(source_origin, sizeof(source_origin), "%d", source_track->sequence->origin);
                av_dict_set(&st->metadata, "source_track_origin", source_origin, 0);
            }
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        } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
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            container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, essence_container_ul);
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            if (st->codec->codec_id == AV_CODEC_ID_NONE)
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                st->codec->codec_id = container_ul->id;
            st->codec->channels = descriptor->channels;
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            st->codec->bits_per_coded_sample = descriptor->bits_per_sample;
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            if (descriptor->sample_rate.den > 0) {
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                st->codec->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);
            } else {
                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);
                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)
                st->duration = av_rescale_q(st->duration,
                                            av_inv_q(material_track->edit_rate),
                                            st->time_base);

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            /* TODO: implement AV_CODEC_ID_RAWAUDIO */
            if (st->codec->codec_id == AV_CODEC_ID_PCM_S16LE) {
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                if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)
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                    st->codec->codec_id = AV_CODEC_ID_PCM_S24LE;
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                else if (descriptor->bits_per_sample == 32)
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                    st->codec->codec_id = AV_CODEC_ID_PCM_S32LE;
            } else if (st->codec->codec_id == AV_CODEC_ID_PCM_S16BE) {
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                if (descriptor->bits_per_sample > 16 && descriptor->bits_per_sample <= 24)
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                    st->codec->codec_id = AV_CODEC_ID_PCM_S24BE;
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                else if (descriptor->bits_per_sample == 32)
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                    st->codec->codec_id = AV_CODEC_ID_PCM_S32BE;
            } else if (st->codec->codec_id == AV_CODEC_ID_MP2) {
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                st->need_parsing = AVSTREAM_PARSE_FULL;
            }
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        } else if (st->codec->codec_type == AVMEDIA_TYPE_DATA) {
            int codec_id = mxf_get_codec_ul(mxf_data_essence_container_uls,
                                            essence_container_ul)->id;
            if (codec_id >= 0 &&
                codec_id < FF_ARRAY_ELEMS(mxf_data_essence_descriptor)) {
                av_dict_set(&st->metadata, "data_type",
                            mxf_data_essence_descriptor[codec_id], 0);
            }
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        }
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        if (descriptor->extradata) {
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            st->codec->extradata = av_mallocz(descriptor->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
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            if (st->codec->extradata) {
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                memcpy(st->codec->extradata, descriptor->extradata, descriptor->extradata_size);
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                st->codec->extradata_size = descriptor->extradata_size;
            }
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        } else if (st->codec->codec_id == AV_CODEC_ID_H264) {
            ret = ff_generate_avci_extradata(st);
            if (ret < 0)
                return ret;
        }
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        if (st->codec->codec_type != AVMEDIA_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {
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            /* TODO: decode timestamps */
            st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
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        }
    }
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    ret = 0;
fail_and_free:
    return ret;
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}

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

    if (size < 0)
        return AVERROR(EINVAL);

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

    if ((ret = avio_get_str16be(pb, size, *str, buf_size)) < 0) {
        av_freep(str);
        return ret;
    }

    return ret;
}

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;
}

static int mxf_timestamp_to_str(uint64_t timestamp, char **str)
{
    struct tm time = { 0 };
    time.tm_year = (timestamp >> 48) - 1900;
    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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    /* msvcrt versions of strftime calls the invalid parameter handler
     * (aborting the process if one isn't set) if the parameters are out
     * of range. */
    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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    *str = av_mallocz(32);
    if (!*str)
        return AVERROR(ENOMEM);
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    if (!strftime(*str, 32, "%Y-%m-%d %H:%M:%S", &time))
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        (*str)[0] = '\0';
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    return 0;
}

#define SET_STR_METADATA(pb, name, str) do { \
    if ((ret = mxf_read_utf16_string(pb, size, &str)) < 0) \
        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); \
    if ((ret = mxf_timestamp_to_str(var, &str)) < 0) \
        return ret; \
    av_dict_set(&s->metadata, name, str, AV_DICT_DONT_STRDUP_VAL); \
} 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 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,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x2f,0x00 }, mxf_read_preface_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 },
    { { 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 },
    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },
    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },
    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },
    { { 0x06,0x0e,0x2b,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },
    { { 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,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* MPEG 2 Video */
    { { 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,0x01,0x01,0x01,0x01,0x01,0x5c,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 */
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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 */
    { { 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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    { { 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_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadFunc *read_child, int ctx_size, enum MXFMetadataSetType type)
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{
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    AVIOContext *pb = mxf->fc->pb;
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    MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;
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    uint64_t klv_end = avio_tell(pb) + klv->length;
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    if (!ctx)
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        return AVERROR(ENOMEM);
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    while (avio_tell(pb) + 4 < klv_end && !pb->eof_reached) {
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        int ret;
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        int tag = avio_rb16(pb);
        int size = avio_rb16(pb); /* KLV specified by 0x53 */
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        uint64_t next = avio_tell(pb) + size;
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        UID uid = {0};

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        av_log(mxf->fc, AV_LOG_TRACE, "local tag %#04x size %d\n", tag, size);
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        if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */
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            av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);
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            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);
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                    av_log(mxf->fc, AV_LOG_TRACE, "local tag %#04x\n", local_tag);
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                    PRINT_KEY(mxf->fc, "uid", uid);
                }
            }
        }
        if (ctx_size && tag == 0x3C0A)
1869
            avio_read(pb, ctx->uid, 16);
1870
        else if ((ret = read_child(ctx, pb, tag, size, uid, -1)) < 0)
1871
            return ret;
1872

1873 1874 1875
        /* Accept the 64k local set limit being exceeded (Avid). Don't accept
         * it extending past the end of the KLV though (zzuf5.mxf). */
        if (avio_tell(pb) > klv_end) {
1876 1877 1878
            if (ctx_size)
                av_free(ctx);

1879 1880 1881 1882 1883 1884
            av_log(mxf->fc, AV_LOG_ERROR,
                   "local tag %#04x extends past end of local set @ %#"PRIx64"\n",
                   tag, klv->offset);
            return AVERROR_INVALIDDATA;
        } else if (avio_tell(pb) <= next)   /* only seek forward, else this can loop for a long time */
            avio_seek(pb, next, SEEK_SET);
1885 1886 1887 1888 1889
    }
    if (ctx_size) ctx->type = type;
    return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;
}

1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905
/**
 * Seeks to the previous partition, if possible
 * @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;

    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 */
    avio_seek(pb, mxf->run_in + mxf->current_partition->previous_partition, SEEK_SET);
    mxf->current_partition = NULL;

1906
    av_log(mxf->fc, AV_LOG_TRACE, "seeking to previous partition\n");
1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922

    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);
    } else {
1923 1924 1925 1926
        uint64_t offset = mxf->footer_partition ? mxf->footer_partition
                                                : mxf->last_partition;

        if (!offset) {
1927
            av_log(mxf->fc, AV_LOG_TRACE, "no last partition\n");
1928 1929 1930
            return 0;
        }

1931
        av_log(mxf->fc, AV_LOG_TRACE, "seeking to last partition\n");
1932 1933 1934 1935 1936

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

        if (!pb->seekable) {
1937
            av_log(mxf->fc, AV_LOG_INFO, "file is not seekable - not parsing last partition\n");
1938 1939 1940
            return -1;
        }

1941 1942 1943 1944 1945 1946
        /* seek to last partition and parse backward */
        if ((ret = avio_seek(pb, mxf->run_in + offset, SEEK_SET)) < 0) {
            av_log(mxf->fc, AV_LOG_ERROR,
                   "failed to seek to last partition @ 0x%" PRIx64
                   " (%"PRId64") - partial file?\n",
                   mxf->run_in + offset, ret);
1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965
            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;
}

1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992
/**
 * Figure out the proper offset and length of the essence container
 * in each partition
 */
static void mxf_compute_essence_containers(MXFContext *mxf)
{
    int x;

    /* everything is already correct */
    if (mxf->op == OPAtom)
        return;

    for (x = 0; x < mxf->partitions_count; x++) {
        MXFPartition *p = &mxf->partitions[x];

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

        if (x >= mxf->partitions_count - 1)
            break;          /* last partition - can't compute length (and we don't need to) */

        /* essence container spans to the next partition */
        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;
1993 1994
            av_log(mxf->fc, AV_LOG_ERROR,
                   "partition %i: bad ThisPartition = %"PRIX64"\n",
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039
                   x+1, mxf->partitions[x+1].this_partition);
        }
    }
}

static int64_t round_to_kag(int64_t position, int kag_size)
{
    /* TODO: account for run-in? the spec isn't clear whether KAG should account for it */
    /* NOTE: kag_size may be any integer between 1 - 2^10 */
    int64_t ret = (position / kag_size) * kag_size;
    return ret == position ? ret : ret + kag_size;
}

static inline void compute_partition_essence_offset(AVFormatContext *s,
                                                    MXFContext *mxf,
                                                    KLVPacket *klv)
{
    MXFPartition *cur_part = mxf->current_partition;
    /* for OP1a we compute essence_offset
     * for OPAtom we point essence_offset after the KL
     *     (usually op1a_essence_offset + 20 or 25)
     * TODO: for OP1a we could eliminate this entire if statement, always
     *       stopping parsing at op1a_essence_offset
     *       for OPAtom we still need the actual essence_offset though
     *       (the KL's length can vary)
     */
    int64_t op1a_essence_offset =
        round_to_kag(cur_part->this_partition + cur_part->pack_length,
                     cur_part->kag_size) +
        round_to_kag(cur_part->header_byte_count, cur_part->kag_size) +
        round_to_kag(cur_part->index_byte_count, cur_part->kag_size);

    if (mxf->op == OPAtom) {
        /* point essence_offset to the actual data
         * OPAtom has all the essence in one big KLV
         */
        cur_part->essence_offset = avio_tell(s->pb);
        cur_part->essence_length = klv->length;
    } else {
        /* NOTE: op1a_essence_offset may be less than to klv.offset
         * (C0023S01.mxf)  */
        cur_part->essence_offset = op1a_essence_offset;
    }
}

2040
static int is_pcm(enum AVCodecID codec_id)
2041 2042
{
    /* we only care about "normal" PCM codecs until we get samples */
2043
    return codec_id >= AV_CODEC_ID_PCM_S16LE && codec_id < AV_CODEC_ID_PCM_S24DAUD;
2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075
}

/**
 * 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().
 */
static void mxf_handle_small_eubc(AVFormatContext *s)
{
    MXFContext *mxf = s->priv_data;

    /* assuming non-OPAtom == frame wrapped
     * no sane writer would wrap 2 byte PCM packets with 20 byte headers.. */
    if (mxf->op != OPAtom)
        return;

    /* expect PCM with exactly one index table segment and a small (< 32) EUBC */
    if (s->nb_streams != 1                                     ||
        s->streams[0]->codec->codec_type != AVMEDIA_TYPE_AUDIO ||
        !is_pcm(s->streams[0]->codec->codec_id)                ||
        mxf->nb_index_tables != 1                              ||
        mxf->index_tables[0].nb_segments != 1                  ||
        mxf->index_tables[0].segments[0]->edit_unit_byte_count >= 32)
        return;

    /* arbitrarily default to 48 kHz PAL audio frame size */
    /* 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. */
    mxf->edit_units_per_packet = 1920;
}

2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103
static void mxf_read_random_index_pack(AVFormatContext *s)
{
    MXFContext *mxf = s->priv_data;
    uint32_t length;
    int64_t file_size;
    KLVPacket klv;

    if (!s->pb->seekable)
        return;

    file_size = avio_size(s->pb);
    avio_seek(s->pb, file_size - 4, SEEK_SET);
    length = avio_rb32(s->pb);
    if (length <= 32 || length >= FFMIN(file_size, INT_MAX))
        goto end;
    avio_seek(s->pb, file_size - length, SEEK_SET);
    if (klv_read_packet(&klv, s->pb) < 0 ||
        !IS_KLV_KEY(klv.key, mxf_random_index_pack_key) ||
        klv.length != length - 20)
        goto end;

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

end:
    avio_seek(s->pb, mxf->run_in, SEEK_SET);
}

2104
static int mxf_read_header(AVFormatContext *s)
2105 2106 2107
{
    MXFContext *mxf = s->priv_data;
    KLVPacket klv;
2108
    int64_t essence_offset = 0;
2109
    int ret;
2110

2111
    mxf->last_forward_tell = INT64_MAX;
2112
    mxf->edit_units_per_packet = 1;
2113

2114 2115
    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");
2116
        return AVERROR_INVALIDDATA;
2117
    }
2118
    avio_seek(s->pb, -14, SEEK_CUR);
2119
    mxf->fc = s;
2120 2121
    mxf->run_in = avio_tell(s->pb);

2122 2123
    mxf_read_random_index_pack(s);

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2124
    while (!s->pb->eof_reached) {
2125

2126 2127
        const MXFMetadataReadTableEntry *metadata;

2128 2129 2130 2131 2132 2133 2134 2135
        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;
        }

2136
        PRINT_KEY(s, "read header", klv.key);
2137
        av_log(s, AV_LOG_TRACE, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);
2138
        if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||
2139
            IS_KLV_KEY(klv.key, mxf_essence_element_key) ||
2140
            IS_KLV_KEY(klv.key, mxf_avid_essence_element_key) ||
2141
            IS_KLV_KEY(klv.key, mxf_system_item_key)) {
2142 2143 2144 2145 2146 2147 2148

            if (!mxf->current_partition) {
                av_log(mxf->fc, AV_LOG_ERROR,
                       "found essence prior to first PartitionPack\n");
                return AVERROR_INVALIDDATA;
            }

2149 2150 2151 2152
            if (!mxf->current_partition->essence_offset) {
                compute_partition_essence_offset(s, mxf, &klv);
            }

2153 2154
            if (!essence_offset)
                essence_offset = klv.offset;
2155 2156 2157 2158

            /* seek to footer, previous partition or stop */
            if (mxf_parse_handle_essence(mxf) <= 0)
                break;
2159
            continue;
2160 2161 2162 2163 2164
        } else if (!memcmp(klv.key, mxf_header_partition_pack_key, 13) &&
                   klv.key[13] >= 2 && klv.key[13] <= 4 && mxf->current_partition) {
            /* next partition pack - keep going, seek to previous partition or stop */
            if(mxf_parse_handle_partition_or_eof(mxf) <= 0)
                break;
2165 2166 2167
            else if (mxf->parsing_backward)
                continue;
            /* we're still parsing forward. proceed to parsing this partition pack */
2168
        }
2169 2170 2171

        for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {
            if (IS_KLV_KEY(klv.key, metadata->key)) {
2172 2173 2174
                int res;
                if (klv.key[5] == 0x53) {
                    res = mxf_read_local_tags(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type);
2175 2176
                } else {
                    uint64_t next = avio_tell(s->pb) + klv.length;
2177
                    res = metadata->read(mxf, s->pb, 0, klv.length, klv.key, klv.offset);
2178 2179 2180 2181 2182 2183 2184 2185

                    /* 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;
                    }

2186 2187
                    avio_seek(s->pb, next, SEEK_SET);
                }
2188
                if (res < 0) {
2189
                    av_log(s, AV_LOG_ERROR, "error reading header metadata\n");
2190
                    return res;
2191 2192
                }
                break;
2193 2194 2195
            } else {
                av_log(s, AV_LOG_VERBOSE, "Dark key " PRIxUID "\n",
                       UID_ARG(klv.key));
2196 2197 2198
            }
        }
        if (!metadata->read)
2199
            avio_skip(s->pb, klv.length);
2200
    }
2201
    /* FIXME avoid seek */
2202
    if (!essence_offset)  {
2203 2204 2205
        av_log(s, AV_LOG_ERROR, "no essence\n");
        return AVERROR_INVALIDDATA;
    }
2206
    avio_seek(s->pb, essence_offset, SEEK_SET);
2207 2208 2209

    mxf_compute_essence_containers(mxf);

2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226
    /* 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)
        return ret;

    if ((ret = mxf_compute_index_tables(mxf)) < 0)
        return ret;

    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);
    } else if (mxf->nb_index_tables == 0 && mxf->op == OPAtom) {
        av_log(mxf->fc, AV_LOG_ERROR, "cannot demux OPAtom without an index\n");
        return AVERROR_INVALIDDATA;
    }

2227 2228
    mxf_handle_small_eubc(s);

2229
    return 0;
2230 2231
}

2232
/**
2233 2234
 * Sets mxf->current_edit_unit based on what offset we're currently at.
 * @return next_ofs if OK, <0 on error
2235
 */
2236
static int64_t mxf_set_current_edit_unit(MXFContext *mxf, int64_t current_offset)
2237
{
2238
    int64_t last_ofs = -1, next_ofs = -1;
2239 2240
    MXFIndexTable *t = &mxf->index_tables[0];

2241 2242 2243
    /* this is called from the OP1a demuxing logic, which means there
     * may be no index tables */
    if (mxf->nb_index_tables <= 0)
2244
        return -1;
2245

2246 2247
    /* find mxf->current_edit_unit so that the next edit unit starts ahead
     * of current_offset */
2248
    while (mxf->current_edit_unit >= 0) {
2249 2250 2251
        if (mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + 1,
                                          NULL, &next_ofs, 0) < 0)
            return -1;
2252

2253 2254 2255 2256 2257
        if (next_ofs <= last_ofs) {
            /* large next_ofs didn't change or current_edit_unit wrapped
             * around this fixes the infinite loop on zzuf3.mxf */
            av_log(mxf->fc, AV_LOG_ERROR,
                   "next_ofs didn't change. not deriving packet timestamps\n");
2258
            return -1;
2259 2260
        }

2261
        if (next_ofs > current_offset)
2262 2263
            break;

2264
        last_ofs = next_ofs;
2265 2266 2267
        mxf->current_edit_unit++;
    }

2268 2269 2270 2271
    /* not checking mxf->current_edit_unit >= t->nb_ptses here since CBR files
     * may lack IndexEntryArrays */
    if (mxf->current_edit_unit < 0)
        return -1;
2272

2273
    return next_ofs;
2274 2275
}

2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321
static int mxf_compute_sample_count(MXFContext *mxf, int stream_index,
                                    uint64_t *sample_count)
{
    int i, total = 0, size = 0;
    AVStream *st = mxf->fc->streams[stream_index];
    MXFTrack *track = st->priv_data;
    AVRational time_base = av_inv_q(track->edit_rate);
    AVRational sample_rate = av_inv_q(st->time_base);
    const MXFSamplesPerFrame *spf = NULL;

    if ((sample_rate.num / sample_rate.den) == 48000)
        spf = ff_mxf_get_samples_per_frame(mxf->fc, time_base);
    if (!spf) {
        int remainder = (sample_rate.num * time_base.num) %
                        (time_base.den * sample_rate.den);
        *sample_count = av_q2d(av_mul_q((AVRational){mxf->current_edit_unit, 1},
                                        av_mul_q(sample_rate, time_base)));
        if (remainder)
            av_log(mxf->fc, AV_LOG_WARNING,
                   "seeking detected on stream #%d with time base (%d/%d) and "
                   "sample rate (%d/%d), audio pts won't be accurate.\n",
                   stream_index, time_base.num, time_base.den,
                   sample_rate.num, sample_rate.den);
        return 0;
    }

    while (spf->samples_per_frame[size]) {
        total += spf->samples_per_frame[size];
        size++;
    }

    if (!size)
        return 0;

    *sample_count = (mxf->current_edit_unit / size) * (uint64_t)total;
    for (i = 0; i < mxf->current_edit_unit % size; i++) {
        *sample_count += spf->samples_per_frame[i];
    }

    return 0;
}

static int mxf_set_audio_pts(MXFContext *mxf, AVCodecContext *codec,
                             AVPacket *pkt)
{
    MXFTrack *track = mxf->fc->streams[pkt->stream_index]->priv_data;
Luca Barbato's avatar
Luca Barbato committed
2322 2323 2324 2325
    int64_t bits_per_sample = codec->bits_per_coded_sample;

    if (!bits_per_sample)
        bits_per_sample = av_get_bits_per_sample(codec->codec_id);
2326 2327 2328 2329 2330 2331 2332 2333 2334 2335

    pkt->pts = track->sample_count;

    if (codec->channels <= 0 || codec->channels * bits_per_sample < 8)
        return AVERROR_INVALIDDATA;

    track->sample_count += pkt->size / (codec->channels * bits_per_sample / 8);
    return 0;
}

2336 2337 2338
static int mxf_read_packet_old(AVFormatContext *s, AVPacket *pkt)
{
    KLVPacket klv;
2339
    MXFContext *mxf = s->priv_data;
2340
    int ret;
2341 2342

    while (!s->pb->eof_reached) {
2343 2344
        if ((ret = klv_read_packet(&klv, s->pb)) < 0)
            return ret;
2345
        PRINT_KEY(s, "read packet", klv.key);
2346
        av_log(s, AV_LOG_TRACE, "size %"PRIu64" offset %#"PRIx64"\n", klv.length, klv.offset);
2347
        if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {
2348 2349
            ret = mxf_decrypt_triplet(s, pkt, &klv);
            if (ret < 0) {
2350
                av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");
2351
                return ret;
2352 2353 2354 2355 2356 2357
            }
            return 0;
        }
        if (IS_KLV_KEY(klv.key, mxf_essence_element_key) ||
            IS_KLV_KEY(klv.key, mxf_avid_essence_element_key)) {
            int index = mxf_get_stream_index(s, &klv);
2358
            int64_t next_ofs, next_klv;
2359 2360
            AVStream *st;
            MXFTrack *track;
2361
            AVCodecContext *codec;
2362

2363
            if (index < 0) {
2364 2365 2366
                av_log(s, AV_LOG_ERROR,
                       "error getting stream index %"PRIu32"\n",
                       AV_RB32(klv.key + 12));
2367 2368
                goto skip;
            }
2369 2370 2371 2372

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

2373 2374
            if (s->streams[index]->discard == AVDISCARD_ALL)
                goto skip;
2375 2376 2377 2378 2379 2380 2381 2382

            next_klv = avio_tell(s->pb) + klv.length;
            next_ofs = mxf_set_current_edit_unit(mxf, klv.offset);

            if (next_ofs >= 0 && next_klv > next_ofs) {
                /* if this check is hit then it's possible OPAtom was treated
                 * as OP1a truncate the packet since it's probably very large
                 * (>2 GiB is common) */
2383 2384 2385 2386
                avpriv_request_sample(s,
                                      "OPAtom misinterpreted as OP1a?"
                                      "KLV for edit unit %i extending into "
                                      "next edit unit",
2387 2388 2389 2390
                                      mxf->current_edit_unit);
                klv.length = next_ofs - avio_tell(s->pb);
            }

2391 2392
            /* check for 8 channels AES3 element */
            if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {
2393 2394 2395
                ret = mxf_get_d10_aes3_packet(s->pb, s->streams[index],
                                              pkt, klv.length);
                if (ret < 0) {
2396
                    av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");
2397
                    return ret;
2398 2399
                }
            } else {
2400
                ret = av_get_packet(s->pb, pkt, klv.length);
2401 2402 2403 2404 2405 2406
                if (ret < 0)
                    return ret;
            }
            pkt->stream_index = index;
            pkt->pos = klv.offset;

2407 2408 2409
            codec = s->streams[index]->codec;

            if (codec->codec_type == AVMEDIA_TYPE_VIDEO && next_ofs >= 0) {
2410 2411 2412 2413 2414 2415 2416 2417
                /* mxf->current_edit_unit good - see if we have an
                 * index table to derive timestamps from */
                MXFIndexTable *t = &mxf->index_tables[0];

                if (mxf->nb_index_tables >= 1 &&
                    mxf->current_edit_unit < t->nb_ptses) {
                    pkt->dts = mxf->current_edit_unit + t->first_dts;
                    pkt->pts = t->ptses[mxf->current_edit_unit];
2418 2419 2420 2421 2422
                } else if (track->intra_only) {
                    /* intra-only -> PTS = EditUnit.
                     * let utils.c figure out DTS since it can be
                     * < PTS if low_delay = 0 (Sony IMX30) */
                    pkt->pts = mxf->current_edit_unit;
2423
                }
2424
            } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
2425
                ret = mxf_set_audio_pts(mxf, codec, pkt);
2426 2427
                if (ret < 0)
                    return ret;
2428 2429 2430 2431
            }

            /* seek for truncated packets */
            avio_seek(s->pb, next_klv, SEEK_SET);
2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447

            return 0;
        } else
        skip:
            avio_skip(s->pb, klv.length);
    }
    return AVERROR_EOF;
}

static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    MXFContext *mxf = s->priv_data;
    int ret, size;
    int64_t ret64, pos, next_pos;
    AVStream *st;
    MXFIndexTable *t;
2448
    int edit_units;
2449 2450 2451 2452 2453

    if (mxf->op != OPAtom)
        return mxf_read_packet_old(s, pkt);

    /* OPAtom - clip wrapped demuxing */
2454
    /* NOTE: mxf_read_header() makes sure nb_index_tables > 0 for OPAtom */
2455 2456 2457 2458 2459 2460
    st = s->streams[0];
    t = &mxf->index_tables[0];

    if (mxf->current_edit_unit >= st->duration)
        return AVERROR_EOF;

2461 2462
    edit_units = FFMIN(mxf->edit_units_per_packet, st->duration - mxf->current_edit_unit);

2463 2464 2465 2466 2467
    if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit, NULL, &pos, 1)) < 0)
        return ret;

    /* compute size by finding the next edit unit or the end of the essence container
     * not pretty, but it works */
2468
    if ((ret = mxf_edit_unit_absolute_offset(mxf, t, mxf->current_edit_unit + edit_units, NULL, &next_pos, 0)) < 0 &&
2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484
        (next_pos = mxf_essence_container_end(mxf, t->body_sid)) <= 0) {
        av_log(s, AV_LOG_ERROR, "unable to compute the size of the last packet\n");
        return AVERROR_INVALIDDATA;
    }

    if ((size = next_pos - pos) <= 0) {
        av_log(s, AV_LOG_ERROR, "bad size: %i\n", size);
        return AVERROR_INVALIDDATA;
    }

    if ((ret64 = avio_seek(s->pb, pos, SEEK_SET)) < 0)
        return ret64;

        if ((ret = av_get_packet(s->pb, pkt, size)) != size)
            return ret < 0 ? ret : AVERROR_EOF;

2485 2486
    pkt->stream_index = 0;

2487 2488 2489 2490
    if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && t->ptses &&
        mxf->current_edit_unit >= 0 && mxf->current_edit_unit < t->nb_ptses) {
        pkt->dts = mxf->current_edit_unit + t->first_dts;
        pkt->pts = t->ptses[mxf->current_edit_unit];
2491 2492 2493 2494
    } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
        int ret = mxf_set_audio_pts(mxf, st->codec, pkt);
        if (ret < 0)
            return ret;
2495 2496
    }

2497
    mxf->current_edit_unit += edit_units;
2498 2499 2500 2501 2502

    return 0;
}


2503 2504 2505
static int mxf_read_close(AVFormatContext *s)
{
    MXFContext *mxf = s->priv_data;
2506
    MXFIndexTableSegment *seg;
2507
    int i;
2508 2509

    av_freep(&mxf->packages_refs);
2510 2511 2512 2513

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

2514 2515
    for (i = 0; i < mxf->metadata_sets_count; i++) {
        switch (mxf->metadata_sets[i]->type) {
2516 2517 2518
        case Descriptor:
            av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->extradata);
            break;
2519 2520 2521 2522 2523 2524 2525 2526 2527 2528
        case MultipleDescriptor:
            av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);
            break;
        case Sequence:
            av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);
            break;
        case SourcePackage:
        case MaterialPackage:
            av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);
            break;
2529 2530
        case IndexTableSegment:
            seg = (MXFIndexTableSegment *)mxf->metadata_sets[i];
2531
            av_freep(&seg->temporal_offset_entries);
2532 2533 2534
            av_freep(&seg->flag_entries);
            av_freep(&seg->stream_offset_entries);
            break;
2535 2536 2537 2538 2539
        default:
            break;
        }
        av_freep(&mxf->metadata_sets[i]);
    }
2540
    av_freep(&mxf->partitions);
2541 2542 2543
    av_freep(&mxf->metadata_sets);
    av_freep(&mxf->aesc);
    av_freep(&mxf->local_tags);
2544 2545 2546

    for (i = 0; i < mxf->nb_index_tables; i++) {
        av_freep(&mxf->index_tables[i].segments);
2547
        av_freep(&mxf->index_tables[i].ptses);
2548 2549 2550 2551
        av_freep(&mxf->index_tables[i].fake_index);
    }
    av_freep(&mxf->index_tables);

2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576
    return 0;
}

static int mxf_probe(AVProbeData *p) {
    uint8_t *bufp = p->buf;
    uint8_t *end = p->buf + p->buf_size;

    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);
    for (; bufp < end; bufp++) {
        if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))
            return AVPROBE_SCORE_MAX;
    }
    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;
2577 2578
    MXFContext* mxf = s->priv_data;
    int64_t seekpos;
2579
    int i, ret;
2580
    MXFIndexTable *t;
2581 2582 2583 2584 2585 2586
    MXFTrack *source_track = st->priv_data;

    /* if audio then truncate sample_time to EditRate */
    if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
        sample_time = av_rescale_q(sample_time, st->time_base,
                                   av_inv_q(source_track->edit_rate));
2587

2588
    if (mxf->nb_index_tables <= 0) {
2589
    if (!s->bit_rate)
2590
        return AVERROR_INVALIDDATA;
2591 2592 2593
    if (sample_time < 0)
        sample_time = 0;
    seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);
2594

2595 2596 2597 2598
    seekpos = avio_seek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);
    if (seekpos < 0)
        return seekpos;

2599
    ff_update_cur_dts(s, st, sample_time);
2600
    mxf->current_edit_unit = sample_time;
2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614
    } else {
        t = &mxf->index_tables[0];

        /* 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);

        if (t->fake_index) {
            /* 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;
        } else {
            /* no IndexEntryArray (one or more CBR segments)
             * make sure we don't seek past the end */
2615
            sample_time = FFMIN(sample_time, source_track->original_duration - 1);
2616 2617 2618 2619 2620 2621 2622 2623 2624
        }

        if ((ret = mxf_edit_unit_absolute_offset(mxf, t, sample_time, &sample_time, &seekpos, 1)) << 0)
            return ret;

        ff_update_cur_dts(s, st, sample_time);
        mxf->current_edit_unit = sample_time;
        avio_seek(s->pb, seekpos, SEEK_SET);
    }
2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638

    // 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;
        uint64_t current_sample_count = 0;
        if (cur_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
            ret = mxf_compute_sample_count(mxf, i, &current_sample_count);
            if (ret < 0)
                return ret;

            cur_track->sample_count = current_sample_count;
        }
    }
2639 2640 2641
    return 0;
}

2642
AVInputFormat ff_mxf_demuxer = {
2643
    .name           = "mxf",
2644
    .long_name      = NULL_IF_CONFIG_SMALL("MXF (Material eXchange Format)"),
2645 2646 2647 2648 2649 2650
    .priv_data_size = sizeof(MXFContext),
    .read_probe     = mxf_probe,
    .read_header    = mxf_read_header,
    .read_packet    = mxf_read_packet,
    .read_close     = mxf_read_close,
    .read_seek      = mxf_read_seek,
2651
};