matroskadec.c 139 KB
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/*
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 * Matroska file demuxer
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 * Copyright (c) 2003-2008 The FFmpeg Project
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 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
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 * @file
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 * Matroska file demuxer
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 * @author Ronald Bultje <rbultje@ronald.bitfreak.net>
 * @author with a little help from Moritz Bunkus <moritz@bunkus.org>
 * @author totally reworked by Aurelien Jacobs <aurel@gnuage.org>
 * @see specs available on the Matroska project page: http://www.matroska.org/
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 */

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#include "config.h"

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#include <inttypes.h>
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#include <stdio.h>
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#include "libavutil/avstring.h"
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#include "libavutil/base64.h"
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#include "libavutil/dict.h"
#include "libavutil/intfloat.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/lzo.h"
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#include "libavutil/mastering_display_metadata.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/opt.h"
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#include "libavutil/time_internal.h"
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#include "libavcodec/bytestream.h"
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#include "libavcodec/flac.h"
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#include "libavcodec/mpeg4audio.h"

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#include "avformat.h"
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#include "avio_internal.h"
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#include "internal.h"
#include "isom.h"
#include "matroska.h"
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#include "oggdec.h"
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/* For ff_codec_get_id(). */
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#include "riff.h"
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#include "rmsipr.h"
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#if CONFIG_BZLIB
#include <bzlib.h>
#endif
#if CONFIG_ZLIB
#include <zlib.h>
#endif

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#include "qtpalette.h"

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typedef enum {
    EBML_NONE,
    EBML_UINT,
    EBML_FLOAT,
    EBML_STR,
    EBML_UTF8,
    EBML_BIN,
    EBML_NEST,
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    EBML_LEVEL1,
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    EBML_PASS,
    EBML_STOP,
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    EBML_SINT,
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    EBML_TYPE_COUNT
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} EbmlType;

typedef const struct EbmlSyntax {
    uint32_t id;
    EbmlType type;
    int list_elem_size;
    int data_offset;
    union {
        uint64_t    u;
        double      f;
        const char *s;
        const struct EbmlSyntax *n;
    } def;
} EbmlSyntax;

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typedef struct EbmlList {
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    int nb_elem;
    void *elem;
} EbmlList;

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typedef struct EbmlBin {
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    int      size;
    uint8_t *data;
    int64_t  pos;
} EbmlBin;

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typedef struct Ebml {
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    uint64_t version;
    uint64_t max_size;
    uint64_t id_length;
    char    *doctype;
    uint64_t doctype_version;
} Ebml;

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typedef struct MatroskaTrackCompression {
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    uint64_t algo;
    EbmlBin  settings;
} MatroskaTrackCompression;
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typedef struct MatroskaTrackEncryption {
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    uint64_t algo;
    EbmlBin  key_id;
} MatroskaTrackEncryption;

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typedef struct MatroskaTrackEncoding {
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    uint64_t scope;
    uint64_t type;
    MatroskaTrackCompression compression;
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    MatroskaTrackEncryption encryption;
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} MatroskaTrackEncoding;
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typedef struct MatroskaMasteringMeta {
    double r_x;
    double r_y;
    double g_x;
    double g_y;
    double b_x;
    double b_y;
    double white_x;
    double white_y;
    double max_luminance;
    double min_luminance;
} MatroskaMasteringMeta;

typedef struct MatroskaTrackVideoColor {
    uint64_t matrix_coefficients;
    uint64_t bits_per_channel;
    uint64_t chroma_sub_horz;
    uint64_t chroma_sub_vert;
    uint64_t cb_sub_horz;
    uint64_t cb_sub_vert;
    uint64_t chroma_siting_horz;
    uint64_t chroma_siting_vert;
    uint64_t range;
    uint64_t transfer_characteristics;
    uint64_t primaries;
    uint64_t max_cll;
    uint64_t max_fall;
    MatroskaMasteringMeta mastering_meta;
} MatroskaTrackVideoColor;

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typedef struct MatroskaTrackVideo {
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    double   frame_rate;
    uint64_t display_width;
    uint64_t display_height;
    uint64_t pixel_width;
    uint64_t pixel_height;
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    EbmlBin color_space;
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    uint64_t interlaced;
    uint64_t field_order;
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    uint64_t stereo_mode;
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    uint64_t alpha_mode;
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    MatroskaTrackVideoColor color;
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} MatroskaTrackVideo;
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typedef struct MatroskaTrackAudio {
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    double   samplerate;
    double   out_samplerate;
    uint64_t bitdepth;
    uint64_t channels;

    /* real audio header (extracted from extradata) */
    int      coded_framesize;
    int      sub_packet_h;
    int      frame_size;
    int      sub_packet_size;
    int      sub_packet_cnt;
    int      pkt_cnt;
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    uint64_t buf_timecode;
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    uint8_t *buf;
} MatroskaTrackAudio;
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typedef struct MatroskaTrackPlane {
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    uint64_t uid;
    uint64_t type;
} MatroskaTrackPlane;

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typedef struct MatroskaTrackOperation {
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    EbmlList combine_planes;
} MatroskaTrackOperation;

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typedef struct MatroskaTrack {
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    uint64_t num;
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    uint64_t uid;
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    uint64_t type;
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    char    *name;
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    char    *codec_id;
    EbmlBin  codec_priv;
    char    *language;
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    double time_scale;
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    uint64_t default_duration;
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    uint64_t flag_default;
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    uint64_t flag_forced;
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    uint64_t seek_preroll;
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    MatroskaTrackVideo video;
    MatroskaTrackAudio audio;
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    MatroskaTrackOperation operation;
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    EbmlList encodings;
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    uint64_t codec_delay;
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    uint64_t codec_delay_in_track_tb;
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    AVStream *stream;
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    int64_t end_timecode;
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    int ms_compat;
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    uint64_t max_block_additional_id;
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    uint32_t palette[AVPALETTE_COUNT];
    int has_palette;
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} MatroskaTrack;

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typedef struct MatroskaAttachment {
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    uint64_t uid;
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    char *filename;
    char *mime;
    EbmlBin bin;
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    AVStream *stream;
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} MatroskaAttachment;
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typedef struct MatroskaChapter {
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    uint64_t start;
    uint64_t end;
    uint64_t uid;
    char    *title;
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    AVChapter *chapter;
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} MatroskaChapter;

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typedef struct MatroskaIndexPos {
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    uint64_t track;
    uint64_t pos;
} MatroskaIndexPos;

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typedef struct MatroskaIndex {
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    uint64_t time;
    EbmlList pos;
} MatroskaIndex;

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typedef struct MatroskaTag {
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    char *name;
    char *string;
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    char *lang;
    uint64_t def;
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    EbmlList sub;
} MatroskaTag;

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typedef struct MatroskaTagTarget {
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    char    *type;
    uint64_t typevalue;
    uint64_t trackuid;
    uint64_t chapteruid;
    uint64_t attachuid;
} MatroskaTagTarget;

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typedef struct MatroskaTags {
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    MatroskaTagTarget target;
    EbmlList tag;
} MatroskaTags;

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typedef struct MatroskaSeekhead {
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    uint64_t id;
    uint64_t pos;
} MatroskaSeekhead;

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typedef struct MatroskaLevel {
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    uint64_t start;
    uint64_t length;
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} MatroskaLevel;

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typedef struct MatroskaCluster {
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    uint64_t timecode;
    EbmlList blocks;
} MatroskaCluster;

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typedef struct MatroskaLevel1Element {
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    uint64_t id;
    uint64_t pos;
    int parsed;
} MatroskaLevel1Element;

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typedef struct MatroskaDemuxContext {
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    const AVClass *class;
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    AVFormatContext *ctx;

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    /* EBML stuff */
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    int num_levels;
    MatroskaLevel levels[EBML_MAX_DEPTH];
    int level_up;
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    uint32_t current_id;
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    uint64_t time_scale;
    double   duration;
    char    *title;
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    char    *muxingapp;
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    EbmlBin date_utc;
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    EbmlList tracks;
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    EbmlList attachments;
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    EbmlList chapters;
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    EbmlList index;
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    EbmlList tags;
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    EbmlList seekhead;
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    /* byte position of the segment inside the stream */
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    int64_t segment_start;
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    /* the packet queue */
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    AVPacket **packets;
    int num_packets;
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    AVPacket *prev_pkt;
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    int done;
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    /* What to skip before effectively reading a packet. */
    int skip_to_keyframe;
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    uint64_t skip_to_timecode;
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    /* File has a CUES element, but we defer parsing until it is needed. */
    int cues_parsing_deferred;
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    /* Level1 elements and whether they were read yet */
    MatroskaLevel1Element level1_elems[64];
    int num_level1_elems;

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    int current_cluster_num_blocks;
    int64_t current_cluster_pos;
    MatroskaCluster current_cluster;

    /* File has SSA subtitles which prevent incremental cluster parsing. */
    int contains_ssa;
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    /* WebM DASH Manifest live flag/ */
    int is_live;
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} MatroskaDemuxContext;

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typedef struct MatroskaBlock {
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    uint64_t duration;
    int64_t  reference;
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    uint64_t non_simple;
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    EbmlBin  bin;
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    uint64_t additional_id;
    EbmlBin  additional;
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    int64_t discard_padding;
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} MatroskaBlock;

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static const EbmlSyntax ebml_header[] = {
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    { EBML_ID_EBMLREADVERSION,    EBML_UINT, 0, offsetof(Ebml, version),         { .u = EBML_VERSION } },
    { EBML_ID_EBMLMAXSIZELENGTH,  EBML_UINT, 0, offsetof(Ebml, max_size),        { .u = 8 } },
    { EBML_ID_EBMLMAXIDLENGTH,    EBML_UINT, 0, offsetof(Ebml, id_length),       { .u = 4 } },
    { EBML_ID_DOCTYPE,            EBML_STR,  0, offsetof(Ebml, doctype),         { .s = "(none)" } },
    { EBML_ID_DOCTYPEREADVERSION, EBML_UINT, 0, offsetof(Ebml, doctype_version), { .u = 1 } },
    { EBML_ID_EBMLVERSION,        EBML_NONE },
    { EBML_ID_DOCTYPEVERSION,     EBML_NONE },
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    { 0 }
};

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static const EbmlSyntax ebml_syntax[] = {
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    { EBML_ID_HEADER, EBML_NEST, 0, 0, { .n = ebml_header } },
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    { 0 }
};

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static const EbmlSyntax matroska_info[] = {
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    { MATROSKA_ID_TIMECODESCALE, EBML_UINT,  0, offsetof(MatroskaDemuxContext, time_scale), { .u = 1000000 } },
    { MATROSKA_ID_DURATION,      EBML_FLOAT, 0, offsetof(MatroskaDemuxContext, duration) },
    { MATROSKA_ID_TITLE,         EBML_UTF8,  0, offsetof(MatroskaDemuxContext, title) },
    { MATROSKA_ID_WRITINGAPP,    EBML_NONE },
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    { MATROSKA_ID_MUXINGAPP,     EBML_UTF8, 0, offsetof(MatroskaDemuxContext, muxingapp) },
    { MATROSKA_ID_DATEUTC,       EBML_BIN,  0, offsetof(MatroskaDemuxContext, date_utc) },
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    { MATROSKA_ID_SEGMENTUID,    EBML_NONE },
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    { 0 }
};

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static const EbmlSyntax matroska_mastering_meta[] = {
    { MATROSKA_ID_VIDEOCOLOR_RX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, r_x), { .f=-1 } },
    { MATROSKA_ID_VIDEOCOLOR_RY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, r_y), { .f=-1 } },
    { MATROSKA_ID_VIDEOCOLOR_GX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, g_x), { .f=-1 } },
    { MATROSKA_ID_VIDEOCOLOR_GY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, g_y), { .f=-1 } },
    { MATROSKA_ID_VIDEOCOLOR_BX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, b_x), { .f=-1 } },
    { MATROSKA_ID_VIDEOCOLOR_BY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, b_y), { .f=-1 } },
    { MATROSKA_ID_VIDEOCOLOR_WHITEX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, white_x), { .f=-1 } },
    { MATROSKA_ID_VIDEOCOLOR_WHITEY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, white_y), { .f=-1 } },
    { MATROSKA_ID_VIDEOCOLOR_LUMINANCEMIN, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, min_luminance), { .f=-1 } },
    { MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, max_luminance), { .f=-1 } },
    { 0 }
};

static const EbmlSyntax matroska_track_video_color[] = {
    { MATROSKA_ID_VIDEOCOLORMATRIXCOEFF,      EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, matrix_coefficients), { .u=2 } },
    { MATROSKA_ID_VIDEOCOLORBITSPERCHANNEL,   EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, bits_per_channel), { .u=8 } },
    { MATROSKA_ID_VIDEOCOLORCHROMASUBHORZ,    EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, chroma_sub_horz), { .u=0 } },
    { MATROSKA_ID_VIDEOCOLORCHROMASUBVERT,    EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, chroma_sub_vert), { .u=0 } },
    { MATROSKA_ID_VIDEOCOLORCBSUBHORZ,        EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, cb_sub_horz), { .u=0 } },
    { MATROSKA_ID_VIDEOCOLORCBSUBVERT,        EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, cb_sub_vert), { .u=0 } },
    { MATROSKA_ID_VIDEOCOLORCHROMASITINGHORZ, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, chroma_siting_horz), { .u=0 } },
    { MATROSKA_ID_VIDEOCOLORCHROMASITINGVERT, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, chroma_siting_vert), { .u=0 } },
    { MATROSKA_ID_VIDEOCOLORRANGE,            EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, range), { .u=0 } },
    { MATROSKA_ID_VIDEOCOLORTRANSFERCHARACTERISTICS, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, transfer_characteristics), { .u=2 } },
    { MATROSKA_ID_VIDEOCOLORPRIMARIES,        EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, primaries), { .u=2 } },
    { MATROSKA_ID_VIDEOCOLORMAXCLL,           EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, max_cll), { .u=0 } },
    { MATROSKA_ID_VIDEOCOLORMAXFALL,          EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, max_fall), { .u=0 } },
    { MATROSKA_ID_VIDEOCOLORMASTERINGMETA,    EBML_NEST, 0, offsetof(MatroskaTrackVideoColor, mastering_meta), { .n = matroska_mastering_meta } },
    { 0 }
};

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static const EbmlSyntax matroska_track_video[] = {
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    { MATROSKA_ID_VIDEOFRAMERATE,      EBML_FLOAT, 0, offsetof(MatroskaTrackVideo, frame_rate) },
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    { MATROSKA_ID_VIDEODISPLAYWIDTH,   EBML_UINT,  0, offsetof(MatroskaTrackVideo, display_width), { .u=-1 } },
    { MATROSKA_ID_VIDEODISPLAYHEIGHT,  EBML_UINT,  0, offsetof(MatroskaTrackVideo, display_height), { .u=-1 } },
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    { MATROSKA_ID_VIDEOPIXELWIDTH,     EBML_UINT,  0, offsetof(MatroskaTrackVideo, pixel_width) },
    { MATROSKA_ID_VIDEOPIXELHEIGHT,    EBML_UINT,  0, offsetof(MatroskaTrackVideo, pixel_height) },
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    { MATROSKA_ID_VIDEOCOLORSPACE,     EBML_BIN,   0, offsetof(MatroskaTrackVideo, color_space) },
    { MATROSKA_ID_VIDEOALPHAMODE,      EBML_UINT,  0, offsetof(MatroskaTrackVideo, alpha_mode) },
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    { MATROSKA_ID_VIDEOCOLOR,          EBML_NEST,  0, offsetof(MatroskaTrackVideo, color), { .n = matroska_track_video_color } },
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    { MATROSKA_ID_VIDEOPIXELCROPB,     EBML_NONE },
    { MATROSKA_ID_VIDEOPIXELCROPT,     EBML_NONE },
    { MATROSKA_ID_VIDEOPIXELCROPL,     EBML_NONE },
    { MATROSKA_ID_VIDEOPIXELCROPR,     EBML_NONE },
    { MATROSKA_ID_VIDEODISPLAYUNIT,    EBML_NONE },
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    { MATROSKA_ID_VIDEOFLAGINTERLACED, EBML_UINT,  0, offsetof(MatroskaTrackVideo, interlaced),  { .u = MATROSKA_VIDEO_INTERLACE_FLAG_UNDETERMINED } },
    { MATROSKA_ID_VIDEOFIELDORDER,     EBML_UINT,  0, offsetof(MatroskaTrackVideo, field_order), { .u = MATROSKA_VIDEO_FIELDORDER_UNDETERMINED } },
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    { MATROSKA_ID_VIDEOSTEREOMODE,     EBML_UINT,  0, offsetof(MatroskaTrackVideo, stereo_mode), { .u = MATROSKA_VIDEO_STEREOMODE_TYPE_NB } },
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    { MATROSKA_ID_VIDEOASPECTRATIO,    EBML_NONE },
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    { 0 }
};

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static const EbmlSyntax matroska_track_audio[] = {
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    { MATROSKA_ID_AUDIOSAMPLINGFREQ,    EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, samplerate), { .f = 8000.0 } },
    { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, out_samplerate) },
    { MATROSKA_ID_AUDIOBITDEPTH,        EBML_UINT,  0, offsetof(MatroskaTrackAudio, bitdepth) },
    { MATROSKA_ID_AUDIOCHANNELS,        EBML_UINT,  0, offsetof(MatroskaTrackAudio, channels),   { .u = 1 } },
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    { 0 }
};

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static const EbmlSyntax matroska_track_encoding_compression[] = {
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    { MATROSKA_ID_ENCODINGCOMPALGO,     EBML_UINT, 0, offsetof(MatroskaTrackCompression, algo), { .u = 0 } },
    { MATROSKA_ID_ENCODINGCOMPSETTINGS, EBML_BIN,  0, offsetof(MatroskaTrackCompression, settings) },
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    { 0 }
};

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static const EbmlSyntax matroska_track_encoding_encryption[] = {
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    { MATROSKA_ID_ENCODINGENCALGO,        EBML_UINT, 0, offsetof(MatroskaTrackEncryption,algo), {.u = 0} },
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    { MATROSKA_ID_ENCODINGENCKEYID,       EBML_BIN, 0, offsetof(MatroskaTrackEncryption,key_id) },
    { MATROSKA_ID_ENCODINGENCAESSETTINGS, EBML_NONE },
    { MATROSKA_ID_ENCODINGSIGALGO,        EBML_NONE },
    { MATROSKA_ID_ENCODINGSIGHASHALGO,    EBML_NONE },
    { MATROSKA_ID_ENCODINGSIGKEYID,       EBML_NONE },
    { MATROSKA_ID_ENCODINGSIGNATURE,      EBML_NONE },
    { 0 }
};
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static const EbmlSyntax matroska_track_encoding[] = {
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    { MATROSKA_ID_ENCODINGSCOPE,       EBML_UINT, 0, offsetof(MatroskaTrackEncoding, scope),       { .u = 1 } },
    { MATROSKA_ID_ENCODINGTYPE,        EBML_UINT, 0, offsetof(MatroskaTrackEncoding, type),        { .u = 0 } },
    { MATROSKA_ID_ENCODINGCOMPRESSION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, compression), { .n = matroska_track_encoding_compression } },
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    { MATROSKA_ID_ENCODINGENCRYPTION,  EBML_NEST, 0, offsetof(MatroskaTrackEncoding, encryption),  { .n = matroska_track_encoding_encryption } },
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    { MATROSKA_ID_ENCODINGORDER,       EBML_NONE },
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    { 0 }
};

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static const EbmlSyntax matroska_track_encodings[] = {
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    { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack, encodings), { .n = matroska_track_encoding } },
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    { 0 }
};

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static const EbmlSyntax matroska_track_plane[] = {
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    { MATROSKA_ID_TRACKPLANEUID,  EBML_UINT, 0, offsetof(MatroskaTrackPlane,uid) },
    { MATROSKA_ID_TRACKPLANETYPE, EBML_UINT, 0, offsetof(MatroskaTrackPlane,type) },
    { 0 }
};

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static const EbmlSyntax matroska_track_combine_planes[] = {
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    { MATROSKA_ID_TRACKPLANE, EBML_NEST, sizeof(MatroskaTrackPlane), offsetof(MatroskaTrackOperation,combine_planes), {.n = matroska_track_plane} },
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    { 0 }
};

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static const EbmlSyntax matroska_track_operation[] = {
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    { MATROSKA_ID_TRACKCOMBINEPLANES, EBML_NEST, 0, 0, {.n = matroska_track_combine_planes} },
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    { 0 }
};

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static const EbmlSyntax matroska_track[] = {
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    { MATROSKA_ID_TRACKNUMBER,           EBML_UINT,  0, offsetof(MatroskaTrack, num) },
    { MATROSKA_ID_TRACKNAME,             EBML_UTF8,  0, offsetof(MatroskaTrack, name) },
    { MATROSKA_ID_TRACKUID,              EBML_UINT,  0, offsetof(MatroskaTrack, uid) },
    { MATROSKA_ID_TRACKTYPE,             EBML_UINT,  0, offsetof(MatroskaTrack, type) },
    { MATROSKA_ID_CODECID,               EBML_STR,   0, offsetof(MatroskaTrack, codec_id) },
    { MATROSKA_ID_CODECPRIVATE,          EBML_BIN,   0, offsetof(MatroskaTrack, codec_priv) },
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    { MATROSKA_ID_CODECDELAY,            EBML_UINT,  0, offsetof(MatroskaTrack, codec_delay) },
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    { MATROSKA_ID_TRACKLANGUAGE,         EBML_UTF8,  0, offsetof(MatroskaTrack, language),     { .s = "eng" } },
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    { MATROSKA_ID_TRACKDEFAULTDURATION,  EBML_UINT,  0, offsetof(MatroskaTrack, default_duration) },
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    { MATROSKA_ID_TRACKTIMECODESCALE,    EBML_FLOAT, 0, offsetof(MatroskaTrack, time_scale),   { .f = 1.0 } },
    { MATROSKA_ID_TRACKFLAGDEFAULT,      EBML_UINT,  0, offsetof(MatroskaTrack, flag_default), { .u = 1 } },
    { MATROSKA_ID_TRACKFLAGFORCED,       EBML_UINT,  0, offsetof(MatroskaTrack, flag_forced),  { .u = 0 } },
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    { MATROSKA_ID_TRACKVIDEO,            EBML_NEST,  0, offsetof(MatroskaTrack, video),        { .n = matroska_track_video } },
    { MATROSKA_ID_TRACKAUDIO,            EBML_NEST,  0, offsetof(MatroskaTrack, audio),        { .n = matroska_track_audio } },
516
    { MATROSKA_ID_TRACKOPERATION,        EBML_NEST,  0, offsetof(MatroskaTrack, operation),    { .n = matroska_track_operation } },
517
    { MATROSKA_ID_TRACKCONTENTENCODINGS, EBML_NEST,  0, 0,                                     { .n = matroska_track_encodings } },
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    { MATROSKA_ID_TRACKMAXBLKADDID,      EBML_UINT,  0, offsetof(MatroskaTrack, max_block_additional_id) },
    { MATROSKA_ID_SEEKPREROLL,           EBML_UINT,  0, offsetof(MatroskaTrack, seek_preroll) },
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    { MATROSKA_ID_TRACKFLAGENABLED,      EBML_NONE },
    { MATROSKA_ID_TRACKFLAGLACING,       EBML_NONE },
    { MATROSKA_ID_CODECNAME,             EBML_NONE },
    { MATROSKA_ID_CODECDECODEALL,        EBML_NONE },
    { MATROSKA_ID_CODECINFOURL,          EBML_NONE },
    { MATROSKA_ID_CODECDOWNLOADURL,      EBML_NONE },
    { MATROSKA_ID_TRACKMINCACHE,         EBML_NONE },
    { MATROSKA_ID_TRACKMAXCACHE,         EBML_NONE },
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    { 0 }
};

531
static const EbmlSyntax matroska_tracks[] = {
532
    { MATROSKA_ID_TRACKENTRY, EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext, tracks), { .n = matroska_track } },
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    { 0 }
};

536
static const EbmlSyntax matroska_attachment[] = {
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    { MATROSKA_ID_FILEUID,      EBML_UINT, 0, offsetof(MatroskaAttachment, uid) },
    { MATROSKA_ID_FILENAME,     EBML_UTF8, 0, offsetof(MatroskaAttachment, filename) },
    { MATROSKA_ID_FILEMIMETYPE, EBML_STR,  0, offsetof(MatroskaAttachment, mime) },
    { MATROSKA_ID_FILEDATA,     EBML_BIN,  0, offsetof(MatroskaAttachment, bin) },
541
    { MATROSKA_ID_FILEDESC,     EBML_NONE },
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    { 0 }
};

545
static const EbmlSyntax matroska_attachments[] = {
546
    { MATROSKA_ID_ATTACHEDFILE, EBML_NEST, sizeof(MatroskaAttachment), offsetof(MatroskaDemuxContext, attachments), { .n = matroska_attachment } },
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    { 0 }
};

550
static const EbmlSyntax matroska_chapter_display[] = {
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    { MATROSKA_ID_CHAPSTRING,  EBML_UTF8, 0, offsetof(MatroskaChapter, title) },
    { MATROSKA_ID_CHAPLANG,    EBML_NONE },
    { MATROSKA_ID_CHAPCOUNTRY, EBML_NONE },
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    { 0 }
};

557
static const EbmlSyntax matroska_chapter_entry[] = {
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    { MATROSKA_ID_CHAPTERTIMESTART,   EBML_UINT, 0, offsetof(MatroskaChapter, start), { .u = AV_NOPTS_VALUE } },
    { MATROSKA_ID_CHAPTERTIMEEND,     EBML_UINT, 0, offsetof(MatroskaChapter, end),   { .u = AV_NOPTS_VALUE } },
    { MATROSKA_ID_CHAPTERUID,         EBML_UINT, 0, offsetof(MatroskaChapter, uid) },
    { MATROSKA_ID_CHAPTERDISPLAY,     EBML_NEST, 0,                        0,         { .n = matroska_chapter_display } },
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    { MATROSKA_ID_CHAPTERFLAGHIDDEN,  EBML_NONE },
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    { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
    { MATROSKA_ID_CHAPTERPHYSEQUIV,   EBML_NONE },
    { MATROSKA_ID_CHAPTERATOM,        EBML_NONE },
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    { 0 }
};

569
static const EbmlSyntax matroska_chapter[] = {
570
    { MATROSKA_ID_CHAPTERATOM,        EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext, chapters), { .n = matroska_chapter_entry } },
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    { MATROSKA_ID_EDITIONUID,         EBML_NONE },
    { MATROSKA_ID_EDITIONFLAGHIDDEN,  EBML_NONE },
    { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
574
    { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
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    { 0 }
};

578
static const EbmlSyntax matroska_chapters[] = {
579
    { MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, { .n = matroska_chapter } },
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    { 0 }
};

583
static const EbmlSyntax matroska_index_pos[] = {
584 585
    { MATROSKA_ID_CUETRACK,           EBML_UINT, 0, offsetof(MatroskaIndexPos, track) },
    { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos, pos) },
586
    { MATROSKA_ID_CUERELATIVEPOSITION,EBML_NONE },
587
    { MATROSKA_ID_CUEDURATION,        EBML_NONE },
588
    { MATROSKA_ID_CUEBLOCKNUMBER,     EBML_NONE },
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    { 0 }
};

592
static const EbmlSyntax matroska_index_entry[] = {
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    { MATROSKA_ID_CUETIME,          EBML_UINT, 0,                        offsetof(MatroskaIndex, time) },
    { MATROSKA_ID_CUETRACKPOSITION, EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex, pos), { .n = matroska_index_pos } },
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    { 0 }
};

598
static const EbmlSyntax matroska_index[] = {
599
    { MATROSKA_ID_POINTENTRY, EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext, index), { .n = matroska_index_entry } },
600 601 602
    { 0 }
};

603
static const EbmlSyntax matroska_simpletag[] = {
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    { MATROSKA_ID_TAGNAME,        EBML_UTF8, 0,                   offsetof(MatroskaTag, name) },
    { MATROSKA_ID_TAGSTRING,      EBML_UTF8, 0,                   offsetof(MatroskaTag, string) },
    { MATROSKA_ID_TAGLANG,        EBML_STR,  0,                   offsetof(MatroskaTag, lang), { .s = "und" } },
    { MATROSKA_ID_TAGDEFAULT,     EBML_UINT, 0,                   offsetof(MatroskaTag, def) },
    { MATROSKA_ID_TAGDEFAULT_BUG, EBML_UINT, 0,                   offsetof(MatroskaTag, def) },
    { MATROSKA_ID_SIMPLETAG,      EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag, sub),  { .n = matroska_simpletag } },
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    { 0 }
};

613
static const EbmlSyntax matroska_tagtargets[] = {
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    { MATROSKA_ID_TAGTARGETS_TYPE,       EBML_STR,  0, offsetof(MatroskaTagTarget, type) },
    { MATROSKA_ID_TAGTARGETS_TYPEVALUE,  EBML_UINT, 0, offsetof(MatroskaTagTarget, typevalue), { .u = 50 } },
    { MATROSKA_ID_TAGTARGETS_TRACKUID,   EBML_UINT, 0, offsetof(MatroskaTagTarget, trackuid) },
    { MATROSKA_ID_TAGTARGETS_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, chapteruid) },
    { MATROSKA_ID_TAGTARGETS_ATTACHUID,  EBML_UINT, 0, offsetof(MatroskaTagTarget, attachuid) },
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    { 0 }
};

622
static const EbmlSyntax matroska_tag[] = {
623 624
    { MATROSKA_ID_SIMPLETAG,  EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags, tag),    { .n = matroska_simpletag } },
    { MATROSKA_ID_TAGTARGETS, EBML_NEST, 0,                   offsetof(MatroskaTags, target), { .n = matroska_tagtargets } },
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    { 0 }
};

628
static const EbmlSyntax matroska_tags[] = {
629
    { MATROSKA_ID_TAG, EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext, tags), { .n = matroska_tag } },
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    { 0 }
};

633
static const EbmlSyntax matroska_seekhead_entry[] = {
634 635
    { MATROSKA_ID_SEEKID,       EBML_UINT, 0, offsetof(MatroskaSeekhead, id) },
    { MATROSKA_ID_SEEKPOSITION, EBML_UINT, 0, offsetof(MatroskaSeekhead, pos), { .u = -1 } },
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    { 0 }
};

639
static const EbmlSyntax matroska_seekhead[] = {
640
    { MATROSKA_ID_SEEKENTRY, EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext, seekhead), { .n = matroska_seekhead_entry } },
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    { 0 }
};

644
static const EbmlSyntax matroska_segment[] = {
wm4's avatar
wm4 committed
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    { MATROSKA_ID_INFO,        EBML_LEVEL1, 0, 0, { .n = matroska_info } },
    { MATROSKA_ID_TRACKS,      EBML_LEVEL1, 0, 0, { .n = matroska_tracks } },
    { MATROSKA_ID_ATTACHMENTS, EBML_LEVEL1, 0, 0, { .n = matroska_attachments } },
    { MATROSKA_ID_CHAPTERS,    EBML_LEVEL1, 0, 0, { .n = matroska_chapters } },
    { MATROSKA_ID_CUES,        EBML_LEVEL1, 0, 0, { .n = matroska_index } },
    { MATROSKA_ID_TAGS,        EBML_LEVEL1, 0, 0, { .n = matroska_tags } },
    { MATROSKA_ID_SEEKHEAD,    EBML_LEVEL1, 0, 0, { .n = matroska_seekhead } },
652
    { MATROSKA_ID_CLUSTER,     EBML_STOP },
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    { 0 }
};

656
static const EbmlSyntax matroska_segments[] = {
657
    { MATROSKA_ID_SEGMENT, EBML_NEST, 0, 0, { .n = matroska_segment } },
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    { 0 }
};

661
static const EbmlSyntax matroska_blockmore[] = {
662 663 664 665 666
    { MATROSKA_ID_BLOCKADDID,      EBML_UINT, 0, offsetof(MatroskaBlock,additional_id) },
    { MATROSKA_ID_BLOCKADDITIONAL, EBML_BIN,  0, offsetof(MatroskaBlock,additional) },
    { 0 }
};

667
static const EbmlSyntax matroska_blockadditions[] = {
668
    { MATROSKA_ID_BLOCKMORE, EBML_NEST, 0, 0, {.n = matroska_blockmore} },
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    { 0 }
};

672
static const EbmlSyntax matroska_blockgroup[] = {
673
    { MATROSKA_ID_BLOCK,          EBML_BIN,  0, offsetof(MatroskaBlock, bin) },
674
    { MATROSKA_ID_BLOCKADDITIONS, EBML_NEST, 0, 0, { .n = matroska_blockadditions} },
675
    { MATROSKA_ID_SIMPLEBLOCK,    EBML_BIN,  0, offsetof(MatroskaBlock, bin) },
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    { MATROSKA_ID_BLOCKDURATION,  EBML_UINT, 0, offsetof(MatroskaBlock, duration) },
    { MATROSKA_ID_DISCARDPADDING, EBML_SINT, 0, offsetof(MatroskaBlock, discard_padding) },
    { MATROSKA_ID_BLOCKREFERENCE, EBML_SINT, 0, offsetof(MatroskaBlock, reference) },
679
    { MATROSKA_ID_CODECSTATE,     EBML_NONE },
680
    {                          1, EBML_UINT, 0, offsetof(MatroskaBlock, non_simple), { .u = 1 } },
681 682 683
    { 0 }
};

684
static const EbmlSyntax matroska_cluster[] = {
685 686 687 688 689
    { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0,                     offsetof(MatroskaCluster, timecode) },
    { MATROSKA_ID_BLOCKGROUP,      EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
    { MATROSKA_ID_SIMPLEBLOCK,     EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
    { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
    { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
690 691 692
    { 0 }
};

693
static const EbmlSyntax matroska_clusters[] = {
694 695 696 697 698
    { MATROSKA_ID_CLUSTER,  EBML_NEST, 0, 0, { .n = matroska_cluster } },
    { MATROSKA_ID_INFO,     EBML_NONE },
    { MATROSKA_ID_CUES,     EBML_NONE },
    { MATROSKA_ID_TAGS,     EBML_NONE },
    { MATROSKA_ID_SEEKHEAD, EBML_NONE },
699 700 701
    { 0 }
};

702
static const EbmlSyntax matroska_cluster_incremental_parsing[] = {
703 704 705 706 707 708 709 710 711 712
    { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0,                     offsetof(MatroskaCluster, timecode) },
    { MATROSKA_ID_BLOCKGROUP,      EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
    { MATROSKA_ID_SIMPLEBLOCK,     EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
    { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
    { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
    { MATROSKA_ID_INFO,            EBML_NONE },
    { MATROSKA_ID_CUES,            EBML_NONE },
    { MATROSKA_ID_TAGS,            EBML_NONE },
    { MATROSKA_ID_SEEKHEAD,        EBML_NONE },
    { MATROSKA_ID_CLUSTER,         EBML_STOP },
713 714 715
    { 0 }
};

716
static const EbmlSyntax matroska_cluster_incremental[] = {
717 718 719 720 721
    { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
    { MATROSKA_ID_BLOCKGROUP,      EBML_STOP },
    { MATROSKA_ID_SIMPLEBLOCK,     EBML_STOP },
    { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
    { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
722 723 724
    { 0 }
};

725
static const EbmlSyntax matroska_clusters_incremental[] = {
726 727 728 729 730
    { MATROSKA_ID_CLUSTER,  EBML_NEST, 0, 0, { .n = matroska_cluster_incremental } },
    { MATROSKA_ID_INFO,     EBML_NONE },
    { MATROSKA_ID_CUES,     EBML_NONE },
    { MATROSKA_ID_TAGS,     EBML_NONE },
    { MATROSKA_ID_SEEKHEAD, EBML_NONE },
731 732 733
    { 0 }
};

734
static const char *const matroska_doctypes[] = { "matroska", "webm" };
735

736 737
static int matroska_read_close(AVFormatContext *s);

738 739 740 741 742 743 744
static int matroska_resync(MatroskaDemuxContext *matroska, int64_t last_pos)
{
    AVIOContext *pb = matroska->ctx->pb;
    uint32_t id;
    matroska->current_id = 0;
    matroska->num_levels = 0;

745 746
    /* seek to next position to resync from */
    if (avio_seek(pb, last_pos + 1, SEEK_SET) < 0)
747 748 749 750 751
        goto eof;

    id = avio_rb32(pb);

    // try to find a toplevel element
752
    while (!avio_feof(pb)) {
753 754
        if (id == MATROSKA_ID_INFO     || id == MATROSKA_ID_TRACKS      ||
            id == MATROSKA_ID_CUES     || id == MATROSKA_ID_TAGS        ||
755
            id == MATROSKA_ID_SEEKHEAD || id == MATROSKA_ID_ATTACHMENTS ||
756
            id == MATROSKA_ID_CLUSTER  || id == MATROSKA_ID_CHAPTERS) {
757 758
            matroska->current_id = id;
            return 0;
759 760 761
        }
        id = (id << 8) | avio_r8(pb);
    }
762

763 764 765 766 767
eof:
    matroska->done = 1;
    return AVERROR_EOF;
}

768
/*
769
 * Return: Whether we reached the end of a level in the hierarchy or not.
770
 */
771
static int ebml_level_end(MatroskaDemuxContext *matroska)
772
{
773
    AVIOContext *pb = matroska->ctx->pb;
774
    int64_t pos = avio_tell(pb);
775

776
    if (matroska->num_levels > 0) {
777
        MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
778
        if (pos - level->start >= level->length || matroska->current_id) {
779
            matroska->num_levels--;
780
            return 1;
781 782
        }
    }
783
    return (matroska->is_live && matroska->ctx->pb->eof_reached) ? 1 : 0;
784 785 786 787 788 789 790 791
}

/*
 * Read: an "EBML number", which is defined as a variable-length
 * array of bytes. The first byte indicates the length by giving a
 * number of 0-bits followed by a one. The position of the first
 * "one" bit inside the first byte indicates the length of this
 * number.
792
 * Returns: number of bytes read, < 0 on error
793
 */
794
static int ebml_read_num(MatroskaDemuxContext *matroska, AVIOContext *pb,
795
                         int max_size, uint64_t *number)
796
{
797 798
    int read = 1, n = 1;
    uint64_t total = 0;
799

800
    /* The first byte tells us the length in bytes - avio_r8() can normally
801 802
     * return 0, but since that's not a valid first ebmlID byte, we can
     * use it safely here to catch EOS. */
803
    if (!(total = avio_r8(pb))) {
804
        /* we might encounter EOS here */
805
        if (!avio_feof(pb)) {
806
            int64_t pos = avio_tell(pb);
807 808 809
            av_log(matroska->ctx, AV_LOG_ERROR,
                   "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
                   pos, pos);
810
            return pb->error ? pb->error : AVERROR(EIO);
811
        }
812
        return AVERROR_EOF;
813 814 815
    }

    /* get the length of the EBML number */
816
    read = 8 - ff_log2_tab[total];
817
    if (read > max_size) {
818
        int64_t pos = avio_tell(pb) - 1;
819 820 821 822 823 824 825
        av_log(matroska->ctx, AV_LOG_ERROR,
               "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
               (uint8_t) total, pos, pos);
        return AVERROR_INVALIDDATA;
    }

    /* read out length */
826
    total ^= 1 << ff_log2_tab[total];
827
    while (n++ < read)
828
        total = (total << 8) | avio_r8(pb);
829 830 831 832 833 834

    *number = total;

    return read;
}

835 836 837 838 839
/**
 * Read a EBML length value.
 * This needs special handling for the "unknown length" case which has multiple
 * encodings.
 */
840
static int ebml_read_length(MatroskaDemuxContext *matroska, AVIOContext *pb,
841 842 843 844 845 846 847 848
                            uint64_t *number)
{
    int res = ebml_read_num(matroska, pb, 8, number);
    if (res > 0 && *number + 1 == 1ULL << (7 * res))
        *number = 0xffffffffffffffULL;
    return res;
}

849 850 851 852
/*
 * Read the next element as an unsigned int.
 * 0 is success, < 0 is failure.
 */
853
static int ebml_read_uint(AVIOContext *pb, int size, uint64_t *num)
854
{
855
    int n = 0;
856

857
    if (size > 8)
858 859
        return AVERROR_INVALIDDATA;

860
    /* big-endian ordering; build up number */
861 862
    *num = 0;
    while (n++ < size)
863
        *num = (*num << 8) | avio_r8(pb);
864 865 866 867

    return 0;
}

868 869 870 871 872 873 874 875 876 877 878 879 880 881
/*
 * Read the next element as a signed int.
 * 0 is success, < 0 is failure.
 */
static int ebml_read_sint(AVIOContext *pb, int size, int64_t *num)
{
    int n = 1;

    if (size > 8)
        return AVERROR_INVALIDDATA;

    if (size == 0) {
        *num = 0;
    } else {
882
        *num = sign_extend(avio_r8(pb), 8);
883 884 885

        /* big-endian ordering; build up number */
        while (n++ < size)
886
            *num = ((uint64_t)*num << 8) | avio_r8(pb);
887 888 889 890 891
    }

    return 0;
}

892 893 894 895
/*
 * Read the next element as a float.
 * 0 is success, < 0 is failure.
 */
896
static int ebml_read_float(AVIOContext *pb, int size, double *num)
897
{
898
    if (size == 0)
899
        *num = 0;
900
    else if (size == 4)
901
        *num = av_int2float(avio_rb32(pb));
902
    else if (size == 8)
903
        *num = av_int2double(avio_rb64(pb));
904
    else
905 906 907 908 909 910 911 912 913
        return AVERROR_INVALIDDATA;

    return 0;
}

/*
 * Read the next element as an ASCII string.
 * 0 is success, < 0 is failure.
 */
914
static int ebml_read_ascii(AVIOContext *pb, int size, char **str)
915
{
916 917
    char *res;

918
    /* EBML strings are usually not 0-terminated, so we allocate one
919
     * byte more, read the string and NULL-terminate it ourselves. */
920
    if (!(res = av_malloc(size + 1)))
921
        return AVERROR(ENOMEM);
922 923
    if (avio_read(pb, (uint8_t *) res, size) != size) {
        av_free(res);
924
        return AVERROR(EIO);
925
    }
926 927 928
    (res)[size] = '\0';
    av_free(*str);
    *str = res;
929 930 931 932

    return 0;
}

933 934 935 936
/*
 * Read the next element as binary data.
 * 0 is success, < 0 is failure.
 */
937
static int ebml_read_binary(AVIOContext *pb, int length, EbmlBin *bin)
938
{
939 940
    av_fast_padded_malloc(&bin->data, &bin->size, length);
    if (!bin->data)
941 942 943
        return AVERROR(ENOMEM);

    bin->size = length;
944
    bin->pos  = avio_tell(pb);
945
    if (avio_read(pb, bin->data, length) != length) {
946
        av_freep(&bin->data);
947
        bin->size = 0;
948
        return AVERROR(EIO);
949
    }
950 951 952 953

    return 0;
}

954 955 956 957 958
/*
 * Read the next element, but only the header. The contents
 * are supposed to be sub-elements which can be read separately.
 * 0 is success, < 0 is failure.
 */
959
static int ebml_read_master(MatroskaDemuxContext *matroska, uint64_t length)
960
{
961
    AVIOContext *pb = matroska->ctx->pb;
962 963 964 965 966
    MatroskaLevel *level;

    if (matroska->num_levels >= EBML_MAX_DEPTH) {
        av_log(matroska->ctx, AV_LOG_ERROR,
               "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
967
        return AVERROR(ENOSYS);
968 969
    }

970 971
    level         = &matroska->levels[matroska->num_levels++];
    level->start  = avio_tell(pb);
972 973 974 975 976 977 978
    level->length = length;

    return 0;
}

/*
 * Read signed/unsigned "EBML" numbers.
979
 * Return: number of bytes processed, < 0 on error
980
 */
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static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
                                 uint8_t *data, uint32_t size, uint64_t *num)
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{
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    AVIOContext pb;
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    ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL);
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    return ebml_read_num(matroska, &pb, FFMIN(size, 8), num);
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}

/*
 * Same as above, but signed.
 */
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static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
                                 uint8_t *data, uint32_t size, int64_t *num)
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{
    uint64_t unum;
    int res;

    /* read as unsigned number first */
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    if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
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        return res;

    /* make signed (weird way) */
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    *num = unum - ((1LL << (7 * res - 1)) - 1);
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    return res;
}

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static int ebml_parse_elem(MatroskaDemuxContext *matroska,
                           EbmlSyntax *syntax, void *data);
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static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
                         uint32_t id, void *data)
1013 1014
{
    int i;
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    for (i = 0; syntax[i].id; i++)
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        if (id == syntax[i].id)
            break;
1018
    if (!syntax[i].id && id == MATROSKA_ID_CLUSTER &&
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        matroska->num_levels > 0                   &&
        matroska->levels[matroska->num_levels - 1].length == 0xffffffffffffff)
1021
        return 0;  // we reached the end of an unknown size cluster
1022
    if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32) {
1023
        av_log(matroska->ctx, AV_LOG_DEBUG, "Unknown entry 0x%"PRIX32"\n", id);
1024
    }
1025
    return ebml_parse_elem(matroska, &syntax[i], data);
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}

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static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
                      void *data)
1030
{
1031
    if (!matroska->current_id) {
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        uint64_t id;
        int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
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        if (res < 0) {
            // in live mode, finish parsing if EOF is reached.
            return (matroska->is_live && matroska->ctx->pb->eof_reached &&
                    res == AVERROR_EOF) ? 1 : res;
        }
1039
        matroska->current_id = id | 1 << 7 * res;
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    }
    return ebml_parse_id(matroska, syntax, matroska->current_id, data);
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}

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static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
                           void *data)
1046
{
1047
    int i, res = 0;
1048

1049
    for (i = 0; syntax[i].id; i++)
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        switch (syntax[i].type) {
        case EBML_UINT:
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            *(uint64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.u;
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            break;
        case EBML_FLOAT:
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            *(double *) ((char *) data + syntax[i].data_offset) = syntax[i].def.f;
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            break;
        case EBML_STR:
        case EBML_UTF8:
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            // the default may be NULL
            if (syntax[i].def.s) {
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                uint8_t **dst = (uint8_t **) ((uint8_t *) data + syntax[i].data_offset);
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                *dst = av_strdup(syntax[i].def.s);
                if (!*dst)
                    return AVERROR(ENOMEM);
            }
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            break;
1067
        }
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    while (!res && !ebml_level_end(matroska))
        res = ebml_parse(matroska, syntax, data);
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1072
    return res;
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}

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static int is_ebml_id_valid(uint32_t id)
{
    // Due to endian nonsense in Matroska, the highest byte with any bits set
    // will contain the leading length bit. This bit in turn identifies the
    // total byte length of the element by its position within the byte.
    unsigned int bits = av_log2(id);
    return id && (bits + 7) / 8 ==  (8 - bits % 8);
}

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/*
 * Allocate and return the entry for the level1 element with the given ID. If
 * an entry already exists, return the existing entry.
 */
static MatroskaLevel1Element *matroska_find_level1_elem(MatroskaDemuxContext *matroska,
                                                        uint32_t id)
{
    int i;
    MatroskaLevel1Element *elem;

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    if (!is_ebml_id_valid(id))
        return NULL;

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    // Some files link to all clusters; useless.
    if (id == MATROSKA_ID_CLUSTER)
        return NULL;

    // There can be multiple seekheads.
    if (id != MATROSKA_ID_SEEKHEAD) {
        for (i = 0; i < matroska->num_level1_elems; i++) {
            if (matroska->level1_elems[i].id == id)
                return &matroska->level1_elems[i];
        }
    }

    // Only a completely broken file would have more elements.
    // It also provides a low-effort way to escape from circular seekheads
    // (every iteration will add a level1 entry).
    if (matroska->num_level1_elems >= FF_ARRAY_ELEMS(matroska->level1_elems)) {
        av_log(matroska->ctx, AV_LOG_ERROR, "Too many level1 elements or circular seekheads.\n");
        return NULL;
    }

    elem = &matroska->level1_elems[matroska->num_level1_elems++];
    *elem = (MatroskaLevel1Element){.id = id};

    return elem;
}

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static int ebml_parse_elem(MatroskaDemuxContext *matroska,
                           EbmlSyntax *syntax, void *data)
{
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    static const uint64_t max_lengths[EBML_TYPE_COUNT] = {
        [EBML_UINT]  = 8,
        [EBML_FLOAT] = 8,
        // max. 16 MB for strings
        [EBML_STR]   = 0x1000000,
        [EBML_UTF8]  = 0x1000000,
        // max. 256 MB for binary data
        [EBML_BIN]   = 0x10000000,
        // no limits for anything else
    };
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    AVIOContext *pb = matroska->ctx->pb;
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    uint32_t id = syntax->id;
1138
    uint64_t length;
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    int res;
1140
    void *newelem;
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    MatroskaLevel1Element *level1_elem;
1142

1143
    data = (char *) data + syntax->data_offset;
1144 1145
    if (syntax->list_elem_size) {
        EbmlList *list = data;
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        newelem = av_realloc_array(list->elem, list->nb_elem + 1, syntax->list_elem_size);
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        if (!newelem)
            return AVERROR(ENOMEM);
        list->elem = newelem;
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        data = (char *) list->elem + list->nb_elem * syntax->list_elem_size;
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        memset(data, 0, syntax->list_elem_size);
        list->nb_elem++;
    }

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    if (syntax->type != EBML_PASS && syntax->type != EBML_STOP) {
        matroska->current_id = 0;
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        if ((res = ebml_read_length(matroska, pb, &length)) < 0)
1158
            return res;
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        if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) {
            av_log(matroska->ctx, AV_LOG_ERROR,
                   "Invalid length 0x%"PRIx64" > 0x%"PRIx64" for syntax element %i\n",
                   length, max_lengths[syntax->type], syntax->type);
            return AVERROR_INVALIDDATA;
        }
1165
    }
1166

1167
    switch (syntax->type) {
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    case EBML_UINT:
        res = ebml_read_uint(pb, length, data);
        break;
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    case EBML_SINT:
        res = ebml_read_sint(pb, length, data);
        break;
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    case EBML_FLOAT:
        res = ebml_read_float(pb, length, data);
        break;
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    case EBML_STR:
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    case EBML_UTF8:
        res = ebml_read_ascii(pb, length, data);
        break;
    case EBML_BIN:
        res = ebml_read_binary(pb, length, data);
        break;
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    case EBML_LEVEL1:
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    case EBML_NEST:
        if ((res = ebml_read_master(matroska, length)) < 0)
            return res;
        if (id == MATROSKA_ID_SEGMENT)
            matroska->segment_start = avio_tell(matroska->ctx->pb);
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        if (id == MATROSKA_ID_CUES)
            matroska->cues_parsing_deferred = 0;
        if (syntax->type == EBML_LEVEL1 &&
            (level1_elem = matroska_find_level1_elem(matroska, syntax->id))) {
            if (level1_elem->parsed)
                av_log(matroska->ctx, AV_LOG_ERROR, "Duplicate element\n");
            level1_elem->parsed = 1;
        }
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        return ebml_parse_nest(matroska, syntax->def.n, data);
    case EBML_PASS:
        return ebml_parse_id(matroska, syntax->def.n, id, data);
    case EBML_STOP:
        return 1;
1203
    default:
1204
        if (ffio_limit(pb, length) != length)
1205
            return AVERROR(EIO);
1206
        return avio_skip(pb, length) < 0 ? AVERROR(EIO) : 0;
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    }
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    if (res == AVERROR_INVALIDDATA)
        av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
    else if (res == AVERROR(EIO))
        av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
    return res;
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}

static void ebml_free(EbmlSyntax *syntax, void *data)
{
    int i, j;
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    for (i = 0; syntax[i].id; i++) {
        void *data_off = (char *) data + syntax[i].data_offset;
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        switch (syntax[i].type) {
        case EBML_STR:
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        case EBML_UTF8:
            av_freep(data_off);
            break;
        case EBML_BIN:
            av_freep(&((EbmlBin *) data_off)->data);
            break;
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        case EBML_LEVEL1:
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        case EBML_NEST:
            if (syntax[i].list_elem_size) {
                EbmlList *list = data_off;
                char *ptr = list->elem;
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                for (j = 0; j < list->nb_elem;
                     j++, ptr += syntax[i].list_elem_size)
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                    ebml_free(syntax[i].def.n, ptr);
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                av_freep(&list->elem);
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            } else
                ebml_free(syntax[i].def.n, data_off);
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        default:
            break;
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        }
    }
}

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/*
 * Autodetecting...
 */
static int matroska_probe(AVProbeData *p)
{
    uint64_t total = 0;
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    int len_mask = 0x80, size = 1, n = 1, i;
1252

1253
    /* EBML header? */
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    if (AV_RB32(p->buf) != EBML_ID_HEADER)
        return 0;

    /* length of header */
    total = p->buf[4];
    while (size <= 8 && !(total & len_mask)) {
        size++;
        len_mask >>= 1;
    }
    if (size > 8)
1264
        return 0;
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    total &= (len_mask - 1);
    while (n < size)
        total = (total << 8) | p->buf[4 + n++];

1269
    /* Does the probe data contain the whole header? */
1270
    if (p->buf_size < 4 + size + total)
1271
        return 0;
1272

1273
    /* The header should contain a known document type. For now,
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     * we don't parse the whole header but simply check for the
     * availability of that array of characters inside the header.
     * Not fully fool-proof, but good enough. */
1277
    for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
1278
        size_t probelen = strlen(matroska_doctypes[i]);
1279 1280
        if (total < probelen)
            continue;
1281 1282
        for (n = 4 + size; n <= 4 + size + total - probelen; n++)
            if (!memcmp(p->buf + n, matroska_doctypes[i], probelen))
1283 1284
                return AVPROBE_SCORE_MAX;
    }
1285

1286
    // probably valid EBML header but no recognized doctype
1287
    return AVPROBE_SCORE_EXTENSION;
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}

static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
                                                 int num)
{
    MatroskaTrack *tracks = matroska->tracks.elem;
    int i;

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    for (i = 0; i < matroska->tracks.nb_elem; i++)
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        if (tracks[i].num == num)
            return &tracks[i];

    av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
    return NULL;
}

1304
static int matroska_decode_buffer(uint8_t **buf, int *buf_size,
1305
                                  MatroskaTrack *track)
1306
{
1307
    MatroskaTrackEncoding *encodings = track->encodings.elem;
1308
    uint8_t *data = *buf;
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    int isize = *buf_size;
1310
    uint8_t *pkt_data = NULL;
1311
    uint8_t av_unused *newpktdata;
1312 1313 1314 1315
    int pkt_size = isize;
    int result = 0;
    int olen;

1316
    if (pkt_size >= 10000000U)
1317
        return AVERROR_INVALIDDATA;
1318

1319
    switch (encodings[0].compression.algo) {
1320 1321
    case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
    {
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        int header_size = encodings[0].compression.settings.size;
        uint8_t *header = encodings[0].compression.settings.data;

1325
        if (header_size && !header) {
1326
            av_log(NULL, AV_LOG_ERROR, "Compression size but no data in headerstrip\n");
1327 1328
            return -1;
        }
1329

1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341
        if (!header_size)
            return 0;

        pkt_size = isize + header_size;
        pkt_data = av_malloc(pkt_size);
        if (!pkt_data)
            return AVERROR(ENOMEM);

        memcpy(pkt_data, header, header_size);
        memcpy(pkt_data + header_size, data, isize);
        break;
    }
1342
#if CONFIG_LZO
1343 1344
    case MATROSKA_TRACK_ENCODING_COMP_LZO:
        do {
1345
            olen       = pkt_size *= 3;
1346 1347
            newpktdata = av_realloc(pkt_data, pkt_size + AV_LZO_OUTPUT_PADDING);
            if (!newpktdata) {
1348
                result = AVERROR(ENOMEM);
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                goto failed;
            }
            pkt_data = newpktdata;
1352 1353
            result   = av_lzo1x_decode(pkt_data, &olen, data, &isize);
        } while (result == AV_LZO_OUTPUT_FULL && pkt_size < 10000000);
1354 1355
        if (result) {
            result = AVERROR_INVALIDDATA;
1356
            goto failed;
1357
        }
1358 1359
        pkt_size -= olen;
        break;
1360
#endif
1361
#if CONFIG_ZLIB
1362 1363 1364
    case MATROSKA_TRACK_ENCODING_COMP_ZLIB:
    {
        z_stream zstream = { 0 };
1365 1366
        if (inflateInit(&zstream) != Z_OK)
            return -1;
1367
        zstream.next_in  = data;
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        zstream.avail_in = isize;
        do {
1370
            pkt_size  *= 3;
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            newpktdata = av_realloc(pkt_data, pkt_size);
            if (!newpktdata) {
                inflateEnd(&zstream);
1374
                result = AVERROR(ENOMEM);
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                goto failed;
            }
1377
            pkt_data          = newpktdata;
1378
            zstream.avail_out = pkt_size - zstream.total_out;
1379
            zstream.next_out  = pkt_data + zstream.total_out;
1380
            result = inflate(&zstream, Z_NO_FLUSH);
1381
        } while (result == Z_OK && pkt_size < 10000000);
1382 1383
        pkt_size = zstream.total_out;
        inflateEnd(&zstream);
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        if (result != Z_STREAM_END) {
            if (result == Z_MEM_ERROR)
                result = AVERROR(ENOMEM);
            else
                result = AVERROR_INVALIDDATA;
1389
            goto failed;
1390
        }
1391 1392 1393
        break;
    }
#endif
1394
#if CONFIG_BZLIB
1395 1396 1397
    case MATROSKA_TRACK_ENCODING_COMP_BZLIB:
    {
        bz_stream bzstream = { 0 };
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        if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
            return -1;
1400
        bzstream.next_in  = data;
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        bzstream.avail_in = isize;
        do {
1403
            pkt_size  *= 3;
1404 1405 1406
            newpktdata = av_realloc(pkt_data, pkt_size);
            if (!newpktdata) {
                BZ2_bzDecompressEnd(&bzstream);
1407
                result = AVERROR(ENOMEM);
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                goto failed;
            }
1410
            pkt_data           = newpktdata;
1411
            bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
1412
            bzstream.next_out  = pkt_data + bzstream.total_out_lo32;
1413
            result = BZ2_bzDecompress(&bzstream);
1414
        } while (result == BZ_OK && pkt_size < 10000000);
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        pkt_size = bzstream.total_out_lo32;
        BZ2_bzDecompressEnd(&bzstream);
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        if (result != BZ_STREAM_END) {
            if (result == BZ_MEM_ERROR)
                result = AVERROR(ENOMEM);
            else
                result = AVERROR_INVALIDDATA;
1422
            goto failed;
1423
        }
1424 1425 1426
        break;
    }
#endif
1427
    default:
1428
        return AVERROR_INVALIDDATA;
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    }

1431
    *buf      = pkt_data;
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    *buf_size = pkt_size;
    return 0;
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failed:
1436
    av_free(pkt_data);
1437
    return result;
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}

1440
static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
1441
                                 AVDictionary **metadata, char *prefix)
1442 1443
{
    MatroskaTag *tags = list->elem;
1444 1445
    char key[1024];
    int i;
1446

1447 1448 1449
    for (i = 0; i < list->nb_elem; i++) {
        const char *lang = tags[i].lang &&
                           strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1450 1451 1452 1453 1454

        if (!tags[i].name) {
            av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");
            continue;
        }
1455 1456 1457 1458
        if (prefix)
            snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
        else
            av_strlcpy(key, tags[i].name, sizeof(key));
1459
        if (tags[i].def || !lang) {
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            av_dict_set(metadata, key, tags[i].string, 0);
            if (tags[i].sub.nb_elem)
                matroska_convert_tag(s, &tags[i].sub, metadata, key);
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        }
        if (lang) {
            av_strlcat(key, "-", sizeof(key));
            av_strlcat(key, lang, sizeof(key));
1467
            av_dict_set(metadata, key, tags[i].string, 0);
1468 1469 1470
            if (tags[i].sub.nb_elem)
                matroska_convert_tag(s, &tags[i].sub, metadata, key);
        }
1471
    }
1472
    ff_metadata_conv(metadata, NULL, ff_mkv_metadata_conv);
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}

static void matroska_convert_tags(AVFormatContext *s)
{
    MatroskaDemuxContext *matroska = s->priv_data;
    MatroskaTags *tags = matroska->tags.elem;
    int i, j;

1481
    for (i = 0; i < matroska->tags.nb_elem; i++) {
1482
        if (tags[i].target.attachuid) {
1483
            MatroskaAttachment *attachment = matroska->attachments.elem;
1484 1485
            int found = 0;
            for (j = 0; j < matroska->attachments.nb_elem; j++) {
1486
                if (attachment[j].uid == tags[i].target.attachuid &&
1487
                    attachment[j].stream) {
1488 1489
                    matroska_convert_tag(s, &tags[i].tag,
                                         &attachment[j].stream->metadata, NULL);
1490 1491 1492 1493 1494 1495 1496 1497 1498
                    found = 1;
                }
            }
            if (!found) {
                av_log(NULL, AV_LOG_WARNING,
                       "The tags at index %d refer to a "
                       "non-existent attachment %"PRId64".\n",
                       i, tags[i].target.attachuid);
            }
1499 1500
        } else if (tags[i].target.chapteruid) {
            MatroskaChapter *chapter = matroska->chapters.elem;
1501 1502
            int found = 0;
            for (j = 0; j < matroska->chapters.nb_elem; j++) {
1503
                if (chapter[j].uid == tags[i].target.chapteruid &&
1504
                    chapter[j].chapter) {
1505 1506
                    matroska_convert_tag(s, &tags[i].tag,
                                         &chapter[j].chapter->metadata, NULL);
1507 1508 1509 1510 1511 1512 1513 1514 1515
                    found = 1;
                }
            }
            if (!found) {
                av_log(NULL, AV_LOG_WARNING,
                       "The tags at index %d refer to a non-existent chapter "
                       "%"PRId64".\n",
                       i, tags[i].target.chapteruid);
            }
1516 1517
        } else if (tags[i].target.trackuid) {
            MatroskaTrack *track = matroska->tracks.elem;
1518 1519 1520 1521
            int found = 0;
            for (j = 0; j < matroska->tracks.nb_elem; j++) {
                if (track[j].uid == tags[i].target.trackuid &&
                    track[j].stream) {
1522 1523
                    matroska_convert_tag(s, &tags[i].tag,
                                         &track[j].stream->metadata, NULL);
1524 1525 1526 1527 1528 1529 1530 1531 1532
                    found = 1;
               }
            }
            if (!found) {
                av_log(NULL, AV_LOG_WARNING,
                       "The tags at index %d refer to a non-existent track "
                       "%"PRId64".\n",
                       i, tags[i].target.trackuid);
            }
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        } else {
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            matroska_convert_tag(s, &tags[i].tag, &s->metadata,
                                 tags[i].target.type);
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        }
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    }
}

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static int matroska_parse_seekhead_entry(MatroskaDemuxContext *matroska,
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                                         uint64_t pos)
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{
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    uint32_t level_up       = matroska->level_up;
    uint32_t saved_id       = matroska->current_id;
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    int64_t before_pos = avio_tell(matroska->ctx->pb);
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    MatroskaLevel level;
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    int64_t offset;
    int ret = 0;
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    /* seek */
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    offset = pos + matroska->segment_start;
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    if (avio_seek(matroska->ctx->pb, offset, SEEK_SET) == offset) {
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        /* We don't want to lose our seekhead level, so we add
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         * a dummy. This is a crude hack. */
        if (matroska->num_levels == EBML_MAX_DEPTH) {
            av_log(matroska->ctx, AV_LOG_INFO,
                   "Max EBML element depth (%d) reached, "
                   "cannot parse further.\n", EBML_MAX_DEPTH);
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            ret = AVERROR_INVALIDDATA;
        } else {
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            level.start  = 0;
            level.length = (uint64_t) -1;
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            matroska->levels[matroska->num_levels] = level;
            matroska->num_levels++;
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            matroska->current_id                   = 0;
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            ret = ebml_parse(matroska, matroska_segment, matroska);
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            /* remove dummy level */
            while (matroska->num_levels) {
                uint64_t length = matroska->levels[--matroska->num_levels].length;
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                if (length == (uint64_t) -1)
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                    break;
            }
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        }
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    }
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    /* seek back */
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    avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
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    matroska->level_up   = level_up;
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    matroska->current_id = saved_id;
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    return ret;
}

static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
{
    EbmlList *seekhead_list = &matroska->seekhead;
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    int i;
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    // we should not do any seeking in the streaming case
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    if (!matroska->ctx->pb->seekable)
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        return;

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    for (i = 0; i < seekhead_list->nb_elem; i++) {
        MatroskaSeekhead *seekheads = seekhead_list->elem;
        uint32_t id  = seekheads[i].id;
        uint64_t pos = seekheads[i].pos;
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        MatroskaLevel1Element *elem = matroska_find_level1_elem(matroska, id);
        if (!elem || elem->parsed)
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            continue;
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        elem->pos = pos;

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        // defer cues parsing until we actually need cue data.
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        if (id == MATROSKA_ID_CUES)
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            continue;

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        if (matroska_parse_seekhead_entry(matroska, pos) < 0) {
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            // mark index as broken
            matroska->cues_parsing_deferred = -1;
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            break;
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        }
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        elem->parsed = 1;
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    }
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}
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static void matroska_add_index_entries(MatroskaDemuxContext *matroska)
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{
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    EbmlList *index_list;
    MatroskaIndex *index;
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    uint64_t index_scale = 1;
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    int i, j;
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    if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
        return;

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    index_list = &matroska->index;
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    index      = index_list->elem;
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    if (index_list->nb_elem < 2)
        return;
    if (index[1].time > 1E14 / matroska->time_scale) {
        av_log(matroska->ctx, AV_LOG_WARNING, "Dropping apparently-broken index.\n");
        return;
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    }
    for (i = 0; i < index_list->nb_elem; i++) {
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        EbmlList *pos_list    = &index[i].pos;
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        MatroskaIndexPos *pos = pos_list->elem;
        for (j = 0; j < pos_list->nb_elem; j++) {
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            MatroskaTrack *track = matroska_find_track_by_num(matroska,
                                                              pos[j].track);
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            if (track && track->stream)
                av_add_index_entry(track->stream,
                                   pos[j].pos + matroska->segment_start,
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                                   index[i].time / index_scale, 0, 0,
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                                   AVINDEX_KEYFRAME);
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        }
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    }
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}

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static void matroska_parse_cues(MatroskaDemuxContext *matroska) {
    int i;

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    if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
        return;

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    for (i = 0; i < matroska->num_level1_elems; i++) {
        MatroskaLevel1Element *elem = &matroska->level1_elems[i];
        if (elem->id == MATROSKA_ID_CUES && !elem->parsed) {
            if (matroska_parse_seekhead_entry(matroska, elem->pos) < 0)
                matroska->cues_parsing_deferred = -1;
            elem->parsed = 1;
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            break;
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        }
    }
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    matroska_add_index_entries(matroska);
}

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static int matroska_aac_profile(char *codec_id)
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{
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    static const char *const aac_profiles[] = { "MAIN", "LC", "SSR" };
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    int profile;

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    for (profile = 0; profile < FF_ARRAY_ELEMS(aac_profiles); profile++)
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        if (strstr(codec_id, aac_profiles[profile]))
            break;
    return profile + 1;
}

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static int matroska_aac_sri(int samplerate)
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{
    int sri;

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    for (sri = 0; sri < FF_ARRAY_ELEMS(avpriv_mpeg4audio_sample_rates); sri++)
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        if (avpriv_mpeg4audio_sample_rates[sri] == samplerate)
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            break;
    return sri;
}

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static void matroska_metadata_creation_time(AVDictionary **metadata, int64_t date_utc)
{
    /* Convert to seconds and adjust by number of seconds between 2001-01-01 and Epoch */
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    avpriv_dict_set_timestamp(metadata, "creation_time", date_utc / 1000 + 978307200000000LL);
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}

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static int matroska_parse_flac(AVFormatContext *s,
                               MatroskaTrack *track,
                               int *offset)
{
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    AVStream *st = track->stream;
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    uint8_t *p = track->codec_priv.data;
    int size   = track->codec_priv.size;

    if (size < 8 + FLAC_STREAMINFO_SIZE || p[4] & 0x7f) {
        av_log(s, AV_LOG_WARNING, "Invalid FLAC private data\n");
        track->codec_priv.size = 0;
        return 0;
    }
    *offset = 8;
    track->codec_priv.size = 8 + FLAC_STREAMINFO_SIZE;

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    p    += track->codec_priv.size;
    size -= track->codec_priv.size;

    /* parse the remaining metadata blocks if present */
    while (size >= 4) {
        int block_last, block_type, block_size;

        flac_parse_block_header(p, &block_last, &block_type, &block_size);

        p    += 4;
        size -= 4;
        if (block_size > size)
            return 0;

        /* check for the channel mask */
        if (block_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
            AVDictionary *dict = NULL;
            AVDictionaryEntry *chmask;

            ff_vorbis_comment(s, &dict, p, block_size, 0);
            chmask = av_dict_get(dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
            if (chmask) {
                uint64_t mask = strtol(chmask->value, NULL, 0);
                if (!mask || mask & ~0x3ffffULL) {
                    av_log(s, AV_LOG_WARNING,
                           "Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n");
                } else
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                    st->codecpar->channel_layout = mask;
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            }
            av_dict_free(&dict);
        }

        p    += block_size;
        size -= block_size;
    }

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    return 0;
}

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static int mkv_field_order(int64_t field_order)
{
    switch (field_order) {
    case MATROSKA_VIDEO_FIELDORDER_PROGRESSIVE:
        return AV_FIELD_PROGRESSIVE;
    case MATROSKA_VIDEO_FIELDORDER_UNDETERMINED:
        return AV_FIELD_UNKNOWN;
    case MATROSKA_VIDEO_FIELDORDER_TT:
        return AV_FIELD_TT;
    case MATROSKA_VIDEO_FIELDORDER_BB:
        return AV_FIELD_BB;
    case MATROSKA_VIDEO_FIELDORDER_BT:
        return AV_FIELD_BT;
    case MATROSKA_VIDEO_FIELDORDER_TB:
        return AV_FIELD_TB;
    default:
        return AV_FIELD_UNKNOWN;
    }
}

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static void mkv_stereo_mode_display_mul(int stereo_mode,
                                        int *h_width, int *h_height)
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{
    switch (stereo_mode) {
        case MATROSKA_VIDEO_STEREOMODE_TYPE_MONO:
        case MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_RL:
        case MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_LR:
        case MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_RL:
        case MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_LR:
            break;
        case MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT:
        case MATROSKA_VIDEO_STEREOMODE_TYPE_LEFT_RIGHT:
        case MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_RL:
        case MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_LR:
            *h_width = 2;
            break;
        case MATROSKA_VIDEO_STEREOMODE_TYPE_BOTTOM_TOP:
        case MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM:
        case MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_RL:
        case MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_LR:
            *h_height = 2;
            break;
    }
}

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static int mkv_parse_video_color(AVStream *st, const MatroskaTrack *track) {
    const MatroskaMasteringMeta* mastering_meta =
        &track->video.color.mastering_meta;
    // Mastering primaries are CIE 1931 coords, and must be > 0.
    const int has_mastering_primaries =
        mastering_meta->r_x > 0 && mastering_meta->r_y > 0 &&
        mastering_meta->g_x > 0 && mastering_meta->g_y > 0 &&
        mastering_meta->b_x > 0 && mastering_meta->b_y > 0 &&
        mastering_meta->white_x > 0 && mastering_meta->white_y > 0;
    const int has_mastering_luminance = mastering_meta->max_luminance > 0;

    if (track->video.color.matrix_coefficients != AVCOL_SPC_RESERVED)
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        st->codecpar->color_space = track->video.color.matrix_coefficients;
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    if (track->video.color.primaries != AVCOL_PRI_RESERVED)
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        st->codecpar->color_primaries = track->video.color.primaries;
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    if (track->video.color.transfer_characteristics != AVCOL_TRC_RESERVED)
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        st->codecpar->color_trc = track->video.color.transfer_characteristics;
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    if (track->video.color.range != AVCOL_RANGE_UNSPECIFIED &&
        track->video.color.range <= AVCOL_RANGE_JPEG)
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        st->codecpar->color_range = track->video.color.range;
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    if (has_mastering_primaries || has_mastering_luminance) {
        // Use similar rationals as other standards.
        const int chroma_den = 50000;
        const int luma_den = 10000;
        AVMasteringDisplayMetadata *metadata =
            (AVMasteringDisplayMetadata*) av_stream_new_side_data(
                st, AV_PKT_DATA_MASTERING_DISPLAY_METADATA,
                sizeof(AVMasteringDisplayMetadata));
        if (!metadata) {
            return AVERROR(ENOMEM);
        }
        memset(metadata, 0, sizeof(AVMasteringDisplayMetadata));
        if (has_mastering_primaries) {
            metadata->display_primaries[0][0] = av_make_q(
                round(mastering_meta->r_x * chroma_den), chroma_den);
            metadata->display_primaries[0][1] = av_make_q(
                round(mastering_meta->r_y * chroma_den), chroma_den);
            metadata->display_primaries[1][0] = av_make_q(
                round(mastering_meta->g_x * chroma_den), chroma_den);
            metadata->display_primaries[1][1] = av_make_q(
                round(mastering_meta->g_y * chroma_den), chroma_den);
            metadata->display_primaries[2][0] = av_make_q(
                round(mastering_meta->b_x * chroma_den), chroma_den);
            metadata->display_primaries[2][1] = av_make_q(
                round(mastering_meta->b_y * chroma_den), chroma_den);
            metadata->white_point[0] = av_make_q(
                round(mastering_meta->white_x * chroma_den), chroma_den);
            metadata->white_point[1] = av_make_q(
                round(mastering_meta->white_y * chroma_den), chroma_den);
            metadata->has_primaries = 1;
        }
        if (has_mastering_luminance) {
            metadata->max_luminance = av_make_q(
                round(mastering_meta->max_luminance * luma_den), luma_den);
            metadata->min_luminance = av_make_q(
                round(mastering_meta->min_luminance * luma_den), luma_den);
            metadata->has_luminance = 1;
        }
    }
    return 0;
}

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static int get_qt_codec(MatroskaTrack *track, uint32_t *fourcc, enum AVCodecID *codec_id)
{
    const AVCodecTag *codec_tags;

    codec_tags = track->type == MATROSKA_TRACK_TYPE_VIDEO ?
            ff_codec_movvideo_tags : ff_codec_movaudio_tags;

    /* Normalize noncompliant private data that starts with the fourcc
     * by expanding/shifting the data by 4 bytes and storing the data
     * size at the start. */
    if (ff_codec_get_id(codec_tags, AV_RL32(track->codec_priv.data))) {
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        uint8_t *p = av_realloc(track->codec_priv.data,
                                track->codec_priv.size + 4);
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        if (!p)
            return AVERROR(ENOMEM);
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        memmove(p + 4, p, track->codec_priv.size);
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        track->codec_priv.data = p;
        track->codec_priv.size += 4;
        AV_WB32(track->codec_priv.data, track->codec_priv.size);
    }

    *fourcc = AV_RL32(track->codec_priv.data + 4);
    *codec_id = ff_codec_get_id(codec_tags, *fourcc);

    return 0;
}

1888
static int matroska_parse_tracks(AVFormatContext *s)
1889 1890
{
    MatroskaDemuxContext *matroska = s->priv_data;
1891
    MatroskaTrack *tracks = matroska->tracks.elem;
1892
    AVStream *st;
1893
    int i, j, ret;
1894
    int k;
1895

1896
    for (i = 0; i < matroska->tracks.nb_elem; i++) {
1897
        MatroskaTrack *track = &tracks[i];
1898
        enum AVCodecID codec_id = AV_CODEC_ID_NONE;
1899
        EbmlList *encodings_list = &track->encodings;
1900
        MatroskaTrackEncoding *encodings = encodings_list->elem;
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        uint8_t *extradata = NULL;
        int extradata_size = 0;
        int extradata_offset = 0;
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        uint32_t fourcc = 0;
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        AVIOContext b;
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        char* key_id_base64 = NULL;
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        int bit_depth = -1;
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        /* Apply some sanity checks. */
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        if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
            track->type != MATROSKA_TRACK_TYPE_AUDIO &&
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            track->type != MATROSKA_TRACK_TYPE_SUBTITLE &&
            track->type != MATROSKA_TRACK_TYPE_METADATA) {
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            av_log(matroska->ctx, AV_LOG_INFO,
                   "Unknown or unsupported track type %"PRIu64"\n",
                   track->type);
            continue;
        }
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        if (!track->codec_id)
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            continue;

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        if (track->audio.samplerate < 0 || track->audio.samplerate > INT_MAX ||
            isnan(track->audio.samplerate)) {
            av_log(matroska->ctx, AV_LOG_WARNING,
                   "Invalid sample rate %f, defaulting to 8000 instead.\n",
                   track->audio.samplerate);
            track->audio.samplerate = 8000;
        }

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        if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1931
            if (!track->default_duration && track->video.frame_rate > 0)
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                track->default_duration = 1000000000 / track->video.frame_rate;
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            if (track->video.display_width == -1)
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                track->video.display_width = track->video.pixel_width;
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            if (track->video.display_height == -1)
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                track->video.display_height = track->video.pixel_height;
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            if (track->video.color_space.size == 4)
                fourcc = AV_RL32(track->video.color_space.data);
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        } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
            if (!track->audio.out_samplerate)
                track->audio.out_samplerate = track->audio.samplerate;
        }
        if (encodings_list->nb_elem > 1) {
            av_log(matroska->ctx, AV_LOG_ERROR,
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                   "Multiple combined encodings not supported");
1946
        } else if (encodings_list->nb_elem == 1) {
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            if (encodings[0].type) {
                if (encodings[0].encryption.key_id.size > 0) {
                    /* Save the encryption key id to be stored later as a
                       metadata tag. */
                    const int b64_size = AV_BASE64_SIZE(encodings[0].encryption.key_id.size);
                    key_id_base64 = av_malloc(b64_size);
                    if (key_id_base64 == NULL)
                        return AVERROR(ENOMEM);

                    av_base64_encode(key_id_base64, b64_size,
                                     encodings[0].encryption.key_id.data,
                                     encodings[0].encryption.key_id.size);
                } else {
                    encodings[0].scope = 0;
                    av_log(matroska->ctx, AV_LOG_ERROR,
                           "Unsupported encoding type");
                }
            } else if (
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#if CONFIG_ZLIB
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                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB  &&
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#endif
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#if CONFIG_BZLIB
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                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
#endif
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#if CONFIG_LZO
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                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO   &&
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#endif
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                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP) {
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                encodings[0].scope = 0;
                av_log(matroska->ctx, AV_LOG_ERROR,
                       "Unsupported encoding type");
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            } else if (track->codec_priv.size && encodings[0].scope & 2) {
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                uint8_t *codec_priv = track->codec_priv.data;
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                int ret = matroska_decode_buffer(&track->codec_priv.data,
                                                 &track->codec_priv.size,
                                                 track);
                if (ret < 0) {
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                    track->codec_priv.data = NULL;
                    track->codec_priv.size = 0;
                    av_log(matroska->ctx, AV_LOG_ERROR,
                           "Failed to decode codec private data\n");
                }
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                if (codec_priv != track->codec_priv.data)
                    av_free(codec_priv);
            }
        }

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        for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
            if (!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
                         strlen(ff_mkv_codec_tags[j].str))) {
                codec_id = ff_mkv_codec_tags[j].id;
1999
                break;
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            }
2001
        }
2002

2003
        st = track->stream = avformat_new_stream(s, NULL);
2004
        if (!st) {
2005
            av_free(key_id_base64);
2006
            return AVERROR(ENOMEM);
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        }

        if (key_id_base64) {
            /* export encryption key id as base64 metadata tag */
            av_dict_set(&st->metadata, "enc_key_id", key_id_base64, 0);
            av_freep(&key_id_base64);
        }
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2015
        if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC") &&
2016
             track->codec_priv.size >= 40               &&
2017
            track->codec_priv.data) {
2018
            track->ms_compat    = 1;
2019 2020
            bit_depth           = AV_RL16(track->codec_priv.data + 14);
            fourcc              = AV_RL32(track->codec_priv.data + 16);
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            codec_id            = ff_codec_get_id(ff_codec_bmp_tags,
2022
                                                  fourcc);
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            if (!codec_id)
                codec_id        = ff_codec_get_id(ff_codec_movvideo_tags,
                                                  fourcc);
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            extradata_offset    = 40;
        } else if (!strcmp(track->codec_id, "A_MS/ACM") &&
                   track->codec_priv.size >= 14         &&
2029
                   track->codec_priv.data) {
2030
            int ret;
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            ffio_init_context(&b, track->codec_priv.data,
                              track->codec_priv.size,
2033
                              0, NULL, NULL, NULL, NULL);
2034
            ret = ff_get_wav_header(s, &b, st->codecpar, track->codec_priv.size, 0);
2035 2036
            if (ret < 0)
                return ret;
2037
            codec_id         = st->codecpar->codec_id;
2038
            fourcc           = st->codecpar->codec_tag;
2039
            extradata_offset = FFMIN(track->codec_priv.size, 18);
2040
        } else if (!strcmp(track->codec_id, "A_QUICKTIME")
2041 2042
                   /* Normally 36, but allow noncompliant private data */
                   && (track->codec_priv.size >= 32)
2043
                   && (track->codec_priv.data)) {
2044
            uint16_t sample_size;
2045 2046 2047
            int ret = get_qt_codec(track, &fourcc, &codec_id);
            if (ret < 0)
                return ret;
2048
            sample_size = AV_RB16(track->codec_priv.data + 26);
2049
            if (fourcc == 0) {
2050
                if (sample_size == 8) {
2051 2052
                    fourcc = MKTAG('r','a','w',' ');
                    codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
2053
                } else if (sample_size == 16) {
2054 2055 2056 2057
                    fourcc = MKTAG('t','w','o','s');
                    codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
                }
            }
2058 2059 2060 2061
            if ((fourcc == MKTAG('t','w','o','s') ||
                    fourcc == MKTAG('s','o','w','t')) &&
                    sample_size == 8)
                codec_id = AV_CODEC_ID_PCM_S8;
2062
        } else if (!strcmp(track->codec_id, "V_QUICKTIME") &&
2063
                   (track->codec_priv.size >= 21)          &&
2064
                   (track->codec_priv.data)) {
2065 2066 2067
            int ret = get_qt_codec(track, &fourcc, &codec_id);
            if (ret < 0)
                return ret;
2068 2069 2070 2071
            if (codec_id == AV_CODEC_ID_NONE && AV_RL32(track->codec_priv.data+4) == AV_RL32("SMI ")) {
                fourcc = MKTAG('S','V','Q','3');
                codec_id = ff_codec_get_id(ff_codec_movvideo_tags, fourcc);
            }
2072 2073
            if (codec_id == AV_CODEC_ID_NONE) {
                char buf[32];
2074
                av_get_codec_tag_string(buf, sizeof(buf), fourcc);
2075 2076 2077
                av_log(matroska->ctx, AV_LOG_ERROR,
                       "mov FourCC not found %s.\n", buf);
            }
2078 2079 2080 2081 2082
            if (track->codec_priv.size >= 86) {
                bit_depth = AV_RB16(track->codec_priv.data + 82);
                ffio_init_context(&b, track->codec_priv.data,
                                  track->codec_priv.size,
                                  0, NULL, NULL, NULL, NULL);
2083
                if (ff_get_qtpalette(codec_id, &b, track->palette)) {
2084
                    bit_depth &= 0x1F;
2085
                    track->has_palette = 1;
2086 2087
                }
            }
2088
        } else if (codec_id == AV_CODEC_ID_PCM_S16BE) {
2089
            switch (track->audio.bitdepth) {
2090 2091 2092 2093 2094 2095 2096 2097 2098
            case  8:
                codec_id = AV_CODEC_ID_PCM_U8;
                break;
            case 24:
                codec_id = AV_CODEC_ID_PCM_S24BE;
                break;
            case 32:
                codec_id = AV_CODEC_ID_PCM_S32BE;
                break;
2099
            }
2100
        } else if (codec_id == AV_CODEC_ID_PCM_S16LE) {
2101
            switch (track->audio.bitdepth) {
2102 2103 2104 2105 2106 2107 2108 2109 2110
            case  8:
                codec_id = AV_CODEC_ID_PCM_U8;
                break;
            case 24:
                codec_id = AV_CODEC_ID_PCM_S24LE;
                break;
            case 32:
                codec_id = AV_CODEC_ID_PCM_S32LE;
                break;
2111
            }
2112 2113
        } else if (codec_id == AV_CODEC_ID_PCM_F32LE &&
                   track->audio.bitdepth == 64) {
2114 2115
            codec_id = AV_CODEC_ID_PCM_F64LE;
        } else if (codec_id == AV_CODEC_ID_AAC && !track->codec_priv.size) {
2116
            int profile = matroska_aac_profile(track->codec_id);
2117
            int sri     = matroska_aac_sri(track->audio.samplerate);
2118
            extradata   = av_mallocz(5 + AV_INPUT_BUFFER_PADDING_SIZE);
2119
            if (!extradata)
2120
                return AVERROR(ENOMEM);
2121 2122
            extradata[0] = (profile << 3) | ((sri & 0x0E) >> 1);
            extradata[1] = ((sri & 0x01) << 7) | (track->audio.channels << 3);
2123
            if (strstr(track->codec_id, "SBR")) {
2124 2125 2126 2127
                sri            = matroska_aac_sri(track->audio.out_samplerate);
                extradata[2]   = 0x56;
                extradata[3]   = 0xE5;
                extradata[4]   = 0x80 | (sri << 3);
2128
                extradata_size = 5;
2129
            } else
2130
                extradata_size = 2;
2131
        } else if (codec_id == AV_CODEC_ID_ALAC && track->codec_priv.size && track->codec_priv.size < INT_MAX - 12 - AV_INPUT_BUFFER_PADDING_SIZE) {
2132
            /* Only ALAC's magic cookie is stored in Matroska's track headers.
2133 2134
             * Create the "atom size", "tag", and "tag version" fields the
             * decoder expects manually. */
2135
            extradata_size = 12 + track->codec_priv.size;
2136
            extradata      = av_mallocz(extradata_size +
2137
                                        AV_INPUT_BUFFER_PADDING_SIZE);
2138
            if (!extradata)
2139 2140 2141 2142 2143
                return AVERROR(ENOMEM);
            AV_WB32(extradata, extradata_size);
            memcpy(&extradata[4], "alac", 4);
            AV_WB32(&extradata[8], 0);
            memcpy(&extradata[12], track->codec_priv.data,
2144
                   track->codec_priv.size);
2145
        } else if (codec_id == AV_CODEC_ID_TTA) {
2146
            extradata_size = 30;
2147
            extradata      = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
2148
            if (!extradata)
2149
                return AVERROR(ENOMEM);
2150
            ffio_init_context(&b, extradata, extradata_size, 1,
2151
                              NULL, NULL, NULL, NULL);
2152 2153
            avio_write(&b, "TTA1", 4);
            avio_wl16(&b, 1);
2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165
            if (track->audio.channels > UINT16_MAX ||
                track->audio.bitdepth > UINT16_MAX) {
                av_log(matroska->ctx, AV_LOG_WARNING,
                       "Too large audio channel number %"PRIu64
                       " or bitdepth %"PRIu64". Skipping track.\n",
                       track->audio.channels, track->audio.bitdepth);
                av_freep(&extradata);
                if (matroska->ctx->error_recognition & AV_EF_EXPLODE)
                    return AVERROR_INVALIDDATA;
                else
                    continue;
            }
2166 2167
            avio_wl16(&b, track->audio.channels);
            avio_wl16(&b, track->audio.bitdepth);
2168 2169
            if (track->audio.out_samplerate < 0 || track->audio.out_samplerate > INT_MAX)
                return AVERROR_INVALIDDATA;
2170
            avio_wl32(&b, track->audio.out_samplerate);
2171 2172 2173
            avio_wl32(&b, av_rescale((matroska->duration * matroska->time_scale),
                                     track->audio.out_samplerate,
                                     AV_TIME_BASE * 1000));
2174 2175 2176 2177
        } else if (codec_id == AV_CODEC_ID_RV10 ||
                   codec_id == AV_CODEC_ID_RV20 ||
                   codec_id == AV_CODEC_ID_RV30 ||
                   codec_id == AV_CODEC_ID_RV40) {
2178
            extradata_offset = 26;
2179
        } else if (codec_id == AV_CODEC_ID_RA_144) {
2180
            track->audio.out_samplerate = 8000;
2181
            track->audio.channels       = 1;
2182 2183 2184 2185 2186
        } else if ((codec_id == AV_CODEC_ID_RA_288 ||
                    codec_id == AV_CODEC_ID_COOK   ||
                    codec_id == AV_CODEC_ID_ATRAC3 ||
                    codec_id == AV_CODEC_ID_SIPR)
                      && track->codec_priv.data) {
2187
            int flavor;
2188

2189 2190 2191
            ffio_init_context(&b, track->codec_priv.data,
                              track->codec_priv.size,
                              0, NULL, NULL, NULL, NULL);
2192
            avio_skip(&b, 22);
2193 2194
            flavor                       = avio_rb16(&b);
            track->audio.coded_framesize = avio_rb32(&b);
2195
            avio_skip(&b, 12);
2196 2197 2198
            track->audio.sub_packet_h    = avio_rb16(&b);
            track->audio.frame_size      = avio_rb16(&b);
            track->audio.sub_packet_size = avio_rb16(&b);
2199
            if (flavor                        < 0 ||
2200 2201 2202
                track->audio.coded_framesize <= 0 ||
                track->audio.sub_packet_h    <= 0 ||
                track->audio.frame_size      <= 0 ||
2203 2204
                track->audio.sub_packet_size <= 0)
                return AVERROR_INVALIDDATA;
2205 2206
            track->audio.buf = av_malloc_array(track->audio.sub_packet_h,
                                               track->audio.frame_size);
2207 2208
            if (!track->audio.buf)
                return AVERROR(ENOMEM);
2209
            if (codec_id == AV_CODEC_ID_RA_288) {
2210
                st->codecpar->block_align = track->audio.coded_framesize;
2211 2212
                track->codec_priv.size = 0;
            } else {
2213
                if (codec_id == AV_CODEC_ID_SIPR && flavor < 4) {
2214
                    static const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
2215
                    track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
2216
                    st->codecpar->bit_rate          = sipr_bit_rate[flavor];
2217
                }
2218
                st->codecpar->block_align = track->audio.sub_packet_size;
2219
                extradata_offset       = 78;
2220
            }
2221 2222 2223 2224
        } else if (codec_id == AV_CODEC_ID_FLAC && track->codec_priv.size) {
            ret = matroska_parse_flac(s, track, &extradata_offset);
            if (ret < 0)
                return ret;
2225 2226
        } else if (codec_id == AV_CODEC_ID_PRORES && track->codec_priv.size == 4) {
            fourcc = AV_RL32(track->codec_priv.data);
2227
        }
2228
        track->codec_priv.size -= extradata_offset;
2229

2230
        if (codec_id == AV_CODEC_ID_NONE)
2231
            av_log(matroska->ctx, AV_LOG_INFO,
2232
                   "Unknown/unsupported AVCodecID %s.\n", track->codec_id);
2233

2234 2235
        if (track->time_scale < 0.01)
            track->time_scale = 1.0;
2236 2237
        avpriv_set_pts_info(st, 64, matroska->time_scale * track->time_scale,
                            1000 * 1000 * 1000);    /* 64 bit pts in ns */
2238

2239
        /* convert the delay from ns to the track timebase */
2240
        track->codec_delay_in_track_tb = av_rescale_q(track->codec_delay,
2241 2242 2243
                                          (AVRational){ 1, 1000000000 },
                                          st->time_base);

2244
        st->codecpar->codec_id = codec_id;
2245

2246
        if (strcmp(track->language, "und"))
2247 2248
            av_dict_set(&st->metadata, "language", track->language, 0);
        av_dict_set(&st->metadata, "title", track->name, 0);
2249

2250 2251
        if (track->flag_default)
            st->disposition |= AV_DISPOSITION_DEFAULT;
2252 2253
        if (track->flag_forced)
            st->disposition |= AV_DISPOSITION_FORCED;
2254

2255
        if (!st->codecpar->extradata) {
2256
            if (extradata) {
2257 2258
                st->codecpar->extradata      = extradata;
                st->codecpar->extradata_size = extradata_size;
2259
            } else if (track->codec_priv.data && track->codec_priv.size > 0) {
2260
                if (ff_alloc_extradata(st->codecpar, track->codec_priv.size))
2261
                    return AVERROR(ENOMEM);
2262
                memcpy(st->codecpar->extradata,
2263 2264 2265
                       track->codec_priv.data + extradata_offset,
                       track->codec_priv.size);
            }
2266
        }
2267 2268

        if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2269
            MatroskaTrackPlane *planes = track->operation.combine_planes.elem;
2270
            int display_width_mul  = 1;
2271
            int display_height_mul = 1;
2272

2273
            st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
2274
            st->codecpar->codec_tag  = fourcc;
2275
            if (bit_depth >= 0)
2276
                st->codecpar->bits_per_coded_sample = bit_depth;
2277 2278
            st->codecpar->width      = track->video.pixel_width;
            st->codecpar->height     = track->video.pixel_height;
2279

2280 2281 2282
            if (track->video.interlaced == MATROSKA_VIDEO_INTERLACE_FLAG_INTERLACED)
                st->codecpar->field_order = mkv_field_order(track->video.field_order);

2283 2284 2285
            if (track->video.stereo_mode && track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
                mkv_stereo_mode_display_mul(track->video.stereo_mode, &display_width_mul, &display_height_mul);

2286 2287
            av_reduce(&st->sample_aspect_ratio.num,
                      &st->sample_aspect_ratio.den,
2288 2289
                      st->codecpar->height * track->video.display_width  * display_width_mul,
                      st->codecpar->width  * track->video.display_height * display_height_mul,
2290
                      255);
2291
            if (st->codecpar->codec_id != AV_CODEC_ID_HEVC)
2292
                st->need_parsing = AVSTREAM_PARSE_HEADERS;
2293

2294
            if (track->default_duration) {
2295
                av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
2296
                          1000000000, track->default_duration, 30000);
2297
#if FF_API_R_FRAME_RATE
2298 2299
                if (   st->avg_frame_rate.num < st->avg_frame_rate.den * 1000LL
                    && st->avg_frame_rate.num > st->avg_frame_rate.den * 5LL)
2300
                    st->r_frame_rate = st->avg_frame_rate;
2301
#endif
2302
            }
2303

2304
            /* export stereo mode flag as metadata tag */
2305
            if (track->video.stereo_mode && track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
2306
                av_dict_set(&st->metadata, "stereo_mode", ff_matroska_video_stereo_mode[track->video.stereo_mode], 0);
2307

2308 2309 2310 2311
            /* export alpha mode flag as metadata tag  */
            if (track->video.alpha_mode)
                av_dict_set(&st->metadata, "alpha_mode", "1", 0);

2312 2313 2314
            /* if we have virtual track, mark the real tracks */
            for (j=0; j < track->operation.combine_planes.nb_elem; j++) {
                char buf[32];
2315
                if (planes[j].type >= MATROSKA_VIDEO_STEREO_PLANE_COUNT)
2316 2317
                    continue;
                snprintf(buf, sizeof(buf), "%s_%d",
2318
                         ff_matroska_video_stereo_plane[planes[j].type], i);
2319
                for (k=0; k < matroska->tracks.nb_elem; k++)
2320 2321
                    if (planes[j].uid == tracks[k].uid && tracks[k].stream) {
                        av_dict_set(&tracks[k].stream->metadata,
2322
                                    "stereo_mode", buf, 0);
2323 2324 2325
                        break;
                    }
            }
2326 2327 2328 2329 2330 2331 2332
            // add stream level stereo3d side data if it is a supported format
            if (track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
                track->video.stereo_mode != 10 && track->video.stereo_mode != 12) {
                int ret = ff_mkv_stereo3d_conv(st, track->video.stereo_mode);
                if (ret < 0)
                    return ret;
            }
2333 2334 2335 2336 2337 2338

            if (s->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
                int ret = mkv_parse_video_color(st, track);
                if (ret < 0)
                    return ret;
            }
2339
        } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2340
            st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
2341
            st->codecpar->codec_tag   = fourcc;
2342 2343
            st->codecpar->sample_rate = track->audio.out_samplerate;
            st->codecpar->channels    = track->audio.channels;
2344 2345
            if (!st->codecpar->bits_per_coded_sample)
                st->codecpar->bits_per_coded_sample = track->audio.bitdepth;
2346
            if (st->codecpar->codec_id == AV_CODEC_ID_MP3)
2347
                st->need_parsing = AVSTREAM_PARSE_FULL;
2348
            else if (st->codecpar->codec_id != AV_CODEC_ID_AAC)
2349
                st->need_parsing = AVSTREAM_PARSE_HEADERS;
2350
            if (track->codec_delay > 0) {
2351
                st->codecpar->initial_padding = av_rescale_q(track->codec_delay,
2352
                                                             (AVRational){1, 1000000000},
2353 2354
                                                             (AVRational){1, st->codecpar->codec_id == AV_CODEC_ID_OPUS ?
                                                                             48000 : st->codecpar->sample_rate});
2355 2356
            }
            if (track->seek_preroll > 0) {
2357 2358 2359
                st->codecpar->seek_preroll = av_rescale_q(track->seek_preroll,
                                                          (AVRational){1, 1000000000},
                                                          (AVRational){1, st->codecpar->sample_rate});
2360
            }
2361
        } else if (codec_id == AV_CODEC_ID_WEBVTT) {
2362
            st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
2363 2364 2365 2366 2367 2368 2369 2370

            if (!strcmp(track->codec_id, "D_WEBVTT/CAPTIONS")) {
                st->disposition |= AV_DISPOSITION_CAPTIONS;
            } else if (!strcmp(track->codec_id, "D_WEBVTT/DESCRIPTIONS")) {
                st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
            } else if (!strcmp(track->codec_id, "D_WEBVTT/METADATA")) {
                st->disposition |= AV_DISPOSITION_METADATA;
            }
2371
        } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
2372
            st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
2373
            if (st->codecpar->codec_id == AV_CODEC_ID_ASS)
2374
                matroska->contains_ssa = 1;
2375
        }
2376 2377
    }

2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393
    return 0;
}

static int matroska_read_header(AVFormatContext *s)
{
    MatroskaDemuxContext *matroska = s->priv_data;
    EbmlList *attachments_list = &matroska->attachments;
    EbmlList *chapters_list    = &matroska->chapters;
    MatroskaAttachment *attachments;
    MatroskaChapter *chapters;
    uint64_t max_start = 0;
    int64_t pos;
    Ebml ebml = { 0 };
    int i, j, res;

    matroska->ctx = s;
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2394
    matroska->cues_parsing_deferred = 1;
2395 2396

    /* First read the EBML header. */
2397 2398 2399 2400 2401 2402
    if (ebml_parse(matroska, ebml_syntax, &ebml) || !ebml.doctype) {
        av_log(matroska->ctx, AV_LOG_ERROR, "EBML header parsing failed\n");
        ebml_free(ebml_syntax, &ebml);
        return AVERROR_INVALIDDATA;
    }
    if (ebml.version         > EBML_VERSION      ||
2403 2404
        ebml.max_size        > sizeof(uint64_t)  ||
        ebml.id_length       > sizeof(uint32_t)  ||
2405
        ebml.doctype_version > 3) {
2406 2407 2408 2409 2410 2411
        av_log(matroska->ctx, AV_LOG_ERROR,
               "EBML header using unsupported features\n"
               "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
               ebml.version, ebml.doctype, ebml.doctype_version);
        ebml_free(ebml_syntax, &ebml);
        return AVERROR_PATCHWELCOME;
2412 2413 2414 2415 2416
    } else if (ebml.doctype_version == 3) {
        av_log(matroska->ctx, AV_LOG_WARNING,
               "EBML header using unsupported features\n"
               "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
               ebml.version, ebml.doctype, ebml.doctype_version);
2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436
    }
    for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
        if (!strcmp(ebml.doctype, matroska_doctypes[i]))
            break;
    if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
        av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
        if (matroska->ctx->error_recognition & AV_EF_EXPLODE) {
            ebml_free(ebml_syntax, &ebml);
            return AVERROR_INVALIDDATA;
        }
    }
    ebml_free(ebml_syntax, &ebml);

    /* The next thing is a segment. */
    pos = avio_tell(matroska->ctx->pb);
    res = ebml_parse(matroska, matroska_segments, matroska);
    // try resyncing until we find a EBML_STOP type element.
    while (res != 1) {
        res = matroska_resync(matroska, pos);
        if (res < 0)
2437
            goto fail;
2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448
        pos = avio_tell(matroska->ctx->pb);
        res = ebml_parse(matroska, matroska_segment, matroska);
    }
    matroska_execute_seekhead(matroska);

    if (!matroska->time_scale)
        matroska->time_scale = 1000000;
    if (matroska->duration)
        matroska->ctx->duration = matroska->duration * matroska->time_scale *
                                  1000 / AV_TIME_BASE;
    av_dict_set(&s->metadata, "title", matroska->title, 0);
2449 2450 2451 2452
    av_dict_set(&s->metadata, "encoder", matroska->muxingapp, 0);

    if (matroska->date_utc.size == 8)
        matroska_metadata_creation_time(&s->metadata, AV_RB64(matroska->date_utc.data));
2453 2454 2455

    res = matroska_parse_tracks(s);
    if (res < 0)
2456
        goto fail;
2457

2458 2459 2460 2461
    attachments = attachments_list->elem;
    for (j = 0; j < attachments_list->nb_elem; j++) {
        if (!(attachments[j].filename && attachments[j].mime &&
              attachments[j].bin.data && attachments[j].bin.size > 0)) {
2462 2463
            av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
        } else {
2464
            AVStream *st = avformat_new_stream(s, NULL);
2465
            if (!st)
2466
                break;
2467 2468
            av_dict_set(&st->metadata, "filename", attachments[j].filename, 0);
            av_dict_set(&st->metadata, "mimetype", attachments[j].mime, 0);
2469
            st->codecpar->codec_id   = AV_CODEC_ID_NONE;
2470

2471 2472 2473
            for (i = 0; ff_mkv_image_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
                if (!strncmp(ff_mkv_image_mime_tags[i].str, attachments[j].mime,
                             strlen(ff_mkv_image_mime_tags[i].str))) {
2474
                    st->codecpar->codec_id = ff_mkv_image_mime_tags[i].id;
2475 2476 2477 2478
                    break;
                }
            }

2479
            attachments[j].stream = st;
2480

2481 2482 2483
            if (st->codecpar->codec_id != AV_CODEC_ID_NONE) {
                st->disposition         |= AV_DISPOSITION_ATTACHED_PIC;
                st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
2484 2485 2486 2487 2488 2489 2490 2491

                av_init_packet(&st->attached_pic);
                if ((res = av_new_packet(&st->attached_pic, attachments[j].bin.size)) < 0)
                    return res;
                memcpy(st->attached_pic.data, attachments[j].bin.data, attachments[j].bin.size);
                st->attached_pic.stream_index = st->index;
                st->attached_pic.flags       |= AV_PKT_FLAG_KEY;
            } else {
2492
                st->codecpar->codec_type = AVMEDIA_TYPE_ATTACHMENT;
2493
                if (ff_alloc_extradata(st->codecpar, attachments[j].bin.size))
2494
                    break;
2495
                memcpy(st->codecpar->extradata, attachments[j].bin.data,
2496
                       attachments[j].bin.size);
2497 2498 2499 2500

                for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
                    if (!strncmp(ff_mkv_mime_tags[i].str, attachments[j].mime,
                                strlen(ff_mkv_mime_tags[i].str))) {
2501
                        st->codecpar->codec_id = ff_mkv_mime_tags[i].id;
2502 2503
                        break;
                    }
2504 2505 2506 2507 2508 2509
                }
            }
        }
    }

    chapters = chapters_list->elem;
2510 2511 2512
    for (i = 0; i < chapters_list->nb_elem; i++)
        if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid &&
            (max_start == 0 || chapters[i].start > max_start)) {
2513
            chapters[i].chapter =
2514 2515 2516 2517
                avpriv_new_chapter(s, chapters[i].uid,
                                   (AVRational) { 1, 1000000000 },
                                   chapters[i].start, chapters[i].end,
                                   chapters[i].title);
2518 2519 2520 2521
            if (chapters[i].chapter) {
                av_dict_set(&chapters[i].chapter->metadata,
                            "title", chapters[i].title, 0);
            }
2522 2523
            max_start = chapters[i].start;
        }
2524

2525 2526
    matroska_add_index_entries(matroska);

2527 2528
    matroska_convert_tags(s);

2529
    return 0;
2530 2531 2532
fail:
    matroska_read_close(s);
    return res;
2533 2534
}

2535 2536 2537 2538 2539 2540 2541 2542
/*
 * Put one packet in an application-supplied AVPacket struct.
 * Returns 0 on success or -1 on failure.
 */
static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
                                   AVPacket *pkt)
{
    if (matroska->num_packets > 0) {
2543 2544
        MatroskaTrack *tracks = matroska->tracks.elem;
        MatroskaTrack *track;
2545
        memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
2546
        av_freep(&matroska->packets[0]);
2547 2548
        track = &tracks[pkt->stream_index];
        if (track->has_palette) {
2549 2550 2551 2552
            uint8_t *pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
            if (!pal) {
                av_log(matroska->ctx, AV_LOG_ERROR, "Cannot append palette to packet\n");
            } else {
2553
                memcpy(pal, track->palette, AVPALETTE_SIZE);
2554
            }
2555
            track->has_palette = 0;
2556
        }
2557
        if (matroska->num_packets > 1) {
2558
            void *newpackets;
2559 2560
            memmove(&matroska->packets[0], &matroska->packets[1],
                    (matroska->num_packets - 1) * sizeof(AVPacket *));
2561
            newpackets = av_realloc(matroska->packets,
2562 2563
                                    (matroska->num_packets - 1) *
                                    sizeof(AVPacket *));
2564 2565
            if (newpackets)
                matroska->packets = newpackets;
2566 2567
        } else {
            av_freep(&matroska->packets);
2568
            matroska->prev_pkt = NULL;
2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581
        }
        matroska->num_packets--;
        return 0;
    }

    return -1;
}

/*
 * Free all packets in our internal queue.
 */
static void matroska_clear_queue(MatroskaDemuxContext *matroska)
{
2582
    matroska->prev_pkt = NULL;
2583 2584 2585
    if (matroska->packets) {
        int n;
        for (n = 0; n < matroska->num_packets; n++) {
2586
            av_packet_unref(matroska->packets[n]);
2587
            av_freep(&matroska->packets[n]);
2588
        }
2589
        av_freep(&matroska->packets);
2590 2591 2592 2593
        matroska->num_packets = 0;
    }
}

2594
static int matroska_parse_laces(MatroskaDemuxContext *matroska, uint8_t **buf,
2595
                                int *buf_size, int type,
2596 2597
                                uint32_t **lace_buf, int *laces)
{
2598
    int res = 0, n, size = *buf_size;
2599 2600 2601 2602
    uint8_t *data = *buf;
    uint32_t *lace_size;

    if (!type) {
2603
        *laces    = 1;
2604 2605 2606 2607 2608 2609 2610 2611
        *lace_buf = av_mallocz(sizeof(int));
        if (!*lace_buf)
            return AVERROR(ENOMEM);

        *lace_buf[0] = size;
        return 0;
    }

2612
    av_assert0(size > 0);
2613 2614 2615
    *laces    = *data + 1;
    data     += 1;
    size     -= 1;
2616 2617 2618 2619 2620
    lace_size = av_mallocz(*laces * sizeof(int));
    if (!lace_size)
        return AVERROR(ENOMEM);

    switch (type) {
2621 2622
    case 0x1: /* Xiph lacing */
    {
2623 2624 2625 2626
        uint8_t temp;
        uint32_t total = 0;
        for (n = 0; res == 0 && n < *laces - 1; n++) {
            while (1) {
2627
                if (size <= total) {
2628
                    res = AVERROR_INVALIDDATA;
2629 2630
                    break;
                }
2631
                temp          = *data;
2632
                total        += temp;
2633
                lace_size[n] += temp;
2634 2635
                data         += 1;
                size         -= 1;
2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649
                if (temp != 0xff)
                    break;
            }
        }
        if (size <= total) {
            res = AVERROR_INVALIDDATA;
            break;
        }

        lace_size[n] = size - total;
        break;
    }

    case 0x2: /* fixed-size lacing */
2650
        if (size % (*laces)) {
2651 2652 2653 2654 2655 2656 2657
            res = AVERROR_INVALIDDATA;
            break;
        }
        for (n = 0; n < *laces; n++)
            lace_size[n] = size / *laces;
        break;

2658 2659
    case 0x3: /* EBML lacing */
    {
2660
        uint64_t num;
2661
        uint64_t total;
2662
        n = matroska_ebmlnum_uint(matroska, data, size, &num);
2663
        if (n < 0 || num > INT_MAX) {
2664 2665
            av_log(matroska->ctx, AV_LOG_INFO,
                   "EBML block data error\n");
2666
            res = n<0 ? n : AVERROR_INVALIDDATA;
2667 2668 2669 2670 2671 2672 2673 2674 2675
            break;
        }
        data += n;
        size -= n;
        total = lace_size[0] = num;
        for (n = 1; res == 0 && n < *laces - 1; n++) {
            int64_t snum;
            int r;
            r = matroska_ebmlnum_sint(matroska, data, size, &snum);
2676
            if (r < 0 || lace_size[n - 1] + snum > (uint64_t)INT_MAX) {
2677 2678
                av_log(matroska->ctx, AV_LOG_INFO,
                       "EBML block data error\n");
2679
                res = r<0 ? r : AVERROR_INVALIDDATA;
2680 2681
                break;
            }
2682 2683
            data        += r;
            size        -= r;
2684
            lace_size[n] = lace_size[n - 1] + snum;
2685
            total       += lace_size[n];
2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697
        }
        if (size <= total) {
            res = AVERROR_INVALIDDATA;
            break;
        }
        lace_size[*laces - 1] = size - total;
        break;
    }
    }

    *buf      = data;
    *lace_buf = lace_size;
2698
    *buf_size = size;
2699 2700 2701 2702

    return res;
}

2703
static int matroska_parse_rm_audio(MatroskaDemuxContext *matroska,
2704 2705
                                   MatroskaTrack *track, AVStream *st,
                                   uint8_t *data, int size, uint64_t timecode,
2706 2707
                                   int64_t pos)
{
2708
    int a = st->codecpar->block_align;
2709 2710
    int sps = track->audio.sub_packet_size;
    int cfs = track->audio.coded_framesize;
2711 2712 2713
    int h   = track->audio.sub_packet_h;
    int y   = track->audio.sub_packet_cnt;
    int w   = track->audio.frame_size;
2714 2715 2716 2717 2718
    int x;

    if (!track->audio.pkt_cnt) {
        if (track->audio.sub_packet_cnt == 0)
            track->audio.buf_timecode = timecode;
2719
        if (st->codecpar->codec_id == AV_CODEC_ID_RA_288) {
2720 2721 2722 2723 2724
            if (size < cfs * h / 2) {
                av_log(matroska->ctx, AV_LOG_ERROR,
                       "Corrupt int4 RM-style audio packet size\n");
                return AVERROR_INVALIDDATA;
            }
2725 2726 2727
            for (x = 0; x < h / 2; x++)
                memcpy(track->audio.buf + x * 2 * w + y * cfs,
                       data + x * cfs, cfs);
2728
        } else if (st->codecpar->codec_id == AV_CODEC_ID_SIPR) {
2729 2730 2731 2732 2733
            if (size < w) {
                av_log(matroska->ctx, AV_LOG_ERROR,
                       "Corrupt sipr RM-style audio packet size\n");
                return AVERROR_INVALIDDATA;
            }
2734
            memcpy(track->audio.buf + y * w, data, w);
2735
        } else {
2736
            if (size < sps * w / sps || h<=0 || w%sps) {
2737 2738 2739 2740
                av_log(matroska->ctx, AV_LOG_ERROR,
                       "Corrupt generic RM-style audio packet size\n");
                return AVERROR_INVALIDDATA;
            }
2741 2742 2743 2744
            for (x = 0; x < w / sps; x++)
                memcpy(track->audio.buf +
                       sps * (h * x + ((h + 1) / 2) * (y & 1) + (y >> 1)),
                       data + x * sps, sps);
2745 2746 2747
        }

        if (++track->audio.sub_packet_cnt >= h) {
2748
            if (st->codecpar->codec_id == AV_CODEC_ID_SIPR)
2749 2750
                ff_rm_reorder_sipr_data(track->audio.buf, h, w);
            track->audio.sub_packet_cnt = 0;
2751
            track->audio.pkt_cnt        = h * w / a;
2752 2753 2754 2755
        }
    }

    while (track->audio.pkt_cnt) {
2756
        int ret;
2757
        AVPacket *pkt = av_mallocz(sizeof(AVPacket));
2758
        if (!pkt)
2759
            return AVERROR(ENOMEM);
2760 2761 2762 2763 2764

        ret = av_new_packet(pkt, a);
        if (ret < 0) {
            av_free(pkt);
            return ret;
2765
        }
2766 2767 2768 2769
        memcpy(pkt->data,
               track->audio.buf + a * (h * w / a - track->audio.pkt_cnt--),
               a);
        pkt->pts                  = track->audio.buf_timecode;
2770
        track->audio.buf_timecode = AV_NOPTS_VALUE;
2771 2772 2773
        pkt->pos                  = pos;
        pkt->stream_index         = st->index;
        dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
2774 2775 2776 2777
    }

    return 0;
}
2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789

/* reconstruct full wavpack blocks from mangled matroska ones */
static int matroska_parse_wavpack(MatroskaTrack *track, uint8_t *src,
                                  uint8_t **pdst, int *size)
{
    uint8_t *dst = NULL;
    int dstlen   = 0;
    int srclen   = *size;
    uint32_t samples;
    uint16_t ver;
    int ret, offset = 0;

2790
    if (srclen < 12 || track->stream->codecpar->extradata_size < 2)
2791 2792
        return AVERROR_INVALIDDATA;

2793
    ver = AV_RL16(track->stream->codecpar->extradata);
2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815

    samples = AV_RL32(src);
    src    += 4;
    srclen -= 4;

    while (srclen >= 8) {
        int multiblock;
        uint32_t blocksize;
        uint8_t *tmp;

        uint32_t flags = AV_RL32(src);
        uint32_t crc   = AV_RL32(src + 4);
        src    += 8;
        srclen -= 8;

        multiblock = (flags & 0x1800) != 0x1800;
        if (multiblock) {
            if (srclen < 4) {
                ret = AVERROR_INVALIDDATA;
                goto fail;
            }
            blocksize = AV_RL32(src);
2816 2817
            src      += 4;
            srclen   -= 4;
2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833
        } else
            blocksize = srclen;

        if (blocksize > srclen) {
            ret = AVERROR_INVALIDDATA;
            goto fail;
        }

        tmp = av_realloc(dst, dstlen + blocksize + 32);
        if (!tmp) {
            ret = AVERROR(ENOMEM);
            goto fail;
        }
        dst     = tmp;
        dstlen += blocksize + 32;

2834 2835 2836 2837 2838 2839 2840 2841 2842 2843
        AV_WL32(dst + offset, MKTAG('w', 'v', 'p', 'k'));   // tag
        AV_WL32(dst + offset +  4, blocksize + 24);         // blocksize - 8
        AV_WL16(dst + offset +  8, ver);                    // version
        AV_WL16(dst + offset + 10, 0);                      // track/index_no
        AV_WL32(dst + offset + 12, 0);                      // total samples
        AV_WL32(dst + offset + 16, 0);                      // block index
        AV_WL32(dst + offset + 20, samples);                // number of samples
        AV_WL32(dst + offset + 24, flags);                  // flags
        AV_WL32(dst + offset + 28, crc);                    // crc
        memcpy(dst + offset + 32, src, blocksize);          // block data
2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859

        src    += blocksize;
        srclen -= blocksize;
        offset += blocksize + 32;
    }

    *pdst = dst;
    *size = dstlen;

    return 0;

fail:
    av_freep(&dst);
    return ret;
}

2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925
static int matroska_parse_webvtt(MatroskaDemuxContext *matroska,
                                 MatroskaTrack *track,
                                 AVStream *st,
                                 uint8_t *data, int data_len,
                                 uint64_t timecode,
                                 uint64_t duration,
                                 int64_t pos)
{
    AVPacket *pkt;
    uint8_t *id, *settings, *text, *buf;
    int id_len, settings_len, text_len;
    uint8_t *p, *q;
    int err;

    if (data_len <= 0)
        return AVERROR_INVALIDDATA;

    p = data;
    q = data + data_len;

    id = p;
    id_len = -1;
    while (p < q) {
        if (*p == '\r' || *p == '\n') {
            id_len = p - id;
            if (*p == '\r')
                p++;
            break;
        }
        p++;
    }

    if (p >= q || *p != '\n')
        return AVERROR_INVALIDDATA;
    p++;

    settings = p;
    settings_len = -1;
    while (p < q) {
        if (*p == '\r' || *p == '\n') {
            settings_len = p - settings;
            if (*p == '\r')
                p++;
            break;
        }
        p++;
    }

    if (p >= q || *p != '\n')
        return AVERROR_INVALIDDATA;
    p++;

    text = p;
    text_len = q - p;
    while (text_len > 0) {
        const int len = text_len - 1;
        const uint8_t c = p[len];
        if (c != '\r' && c != '\n')
            break;
        text_len = len;
    }

    if (text_len <= 0)
        return AVERROR_INVALIDDATA;

    pkt = av_mallocz(sizeof(*pkt));
2926 2927
    if (!pkt)
        return AVERROR(ENOMEM);
2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939
    err = av_new_packet(pkt, text_len);
    if (err < 0) {
        av_free(pkt);
        return AVERROR(err);
    }

    memcpy(pkt->data, text, text_len);

    if (id_len > 0) {
        buf = av_packet_new_side_data(pkt,
                                      AV_PKT_DATA_WEBVTT_IDENTIFIER,
                                      id_len);
2940
        if (!buf) {
2941 2942 2943 2944 2945 2946 2947 2948 2949 2950
            av_free(pkt);
            return AVERROR(ENOMEM);
        }
        memcpy(buf, id, id_len);
    }

    if (settings_len > 0) {
        buf = av_packet_new_side_data(pkt,
                                      AV_PKT_DATA_WEBVTT_SETTINGS,
                                      settings_len);
2951
        if (!buf) {
2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975
            av_free(pkt);
            return AVERROR(ENOMEM);
        }
        memcpy(buf, settings, settings_len);
    }

    // Do we need this for subtitles?
    // pkt->flags = AV_PKT_FLAG_KEY;

    pkt->stream_index = st->index;
    pkt->pts = timecode;

    // Do we need this for subtitles?
    // pkt->dts = timecode;

    pkt->duration = duration;
    pkt->pos = pos;

    dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
    matroska->prev_pkt = pkt;

    return 0;
}

2976
static int matroska_parse_frame(MatroskaDemuxContext *matroska,
2977
                                MatroskaTrack *track, AVStream *st,
2978
                                uint8_t *data, int pkt_size,
2979
                                uint64_t timecode, uint64_t lace_duration,
2980
                                int64_t pos, int is_keyframe,
2981
                                uint8_t *additional, uint64_t additional_id, int additional_size,
2982
                                int64_t discard_padding)
2983 2984 2985 2986 2987 2988
{
    MatroskaTrackEncoding *encodings = track->encodings.elem;
    uint8_t *pkt_data = data;
    int offset = 0, res;
    AVPacket *pkt;

2989
    if (encodings && !encodings->type && encodings->scope & 1) {
2990 2991 2992 2993 2994
        res = matroska_decode_buffer(&pkt_data, &pkt_size, track);
        if (res < 0)
            return res;
    }

2995
    if (st->codecpar->codec_id == AV_CODEC_ID_WAVPACK) {
2996 2997 2998
        uint8_t *wv_data;
        res = matroska_parse_wavpack(track, pkt_data, &wv_data, &pkt_size);
        if (res < 0) {
2999 3000
            av_log(matroska->ctx, AV_LOG_ERROR,
                   "Error parsing a wavpack block.\n");
3001 3002 3003 3004 3005 3006 3007
            goto fail;
        }
        if (pkt_data != data)
            av_freep(&pkt_data);
        pkt_data = wv_data;
    }

3008
    if (st->codecpar->codec_id == AV_CODEC_ID_PRORES &&
3009
        AV_RB32(&data[4]) != MKBETAG('i', 'c', 'p', 'f'))
3010 3011 3012
        offset = 8;

    pkt = av_mallocz(sizeof(AVPacket));
3013
    if (!pkt) {
3014 3015
        if (pkt_data != data)
            av_freep(&pkt_data);
3016
        return AVERROR(ENOMEM);
3017
    }
3018 3019 3020
    /* XXX: prevent data copy... */
    if (av_new_packet(pkt, pkt_size + offset) < 0) {
        av_free(pkt);
3021 3022
        res = AVERROR(ENOMEM);
        goto fail;
3023 3024
    }

3025
    if (st->codecpar->codec_id == AV_CODEC_ID_PRORES && offset == 8) {
3026 3027 3028 3029 3030 3031 3032 3033
        uint8_t *buf = pkt->data;
        bytestream_put_be32(&buf, pkt_size);
        bytestream_put_be32(&buf, MKBETAG('i', 'c', 'p', 'f'));
    }

    memcpy(pkt->data + offset, pkt_data, pkt_size);

    if (pkt_data != data)
3034
        av_freep(&pkt_data);
3035

3036
    pkt->flags        = is_keyframe;
3037 3038
    pkt->stream_index = st->index;

3039 3040 3041
    if (additional_size > 0) {
        uint8_t *side_data = av_packet_new_side_data(pkt,
                                                     AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
3042
                                                     additional_size + 8);
3043
        if (!side_data) {
3044
            av_packet_unref(pkt);
3045
            av_free(pkt);
3046 3047
            return AVERROR(ENOMEM);
        }
3048
        AV_WB64(side_data, additional_id);
3049 3050 3051
        memcpy(side_data + 8, additional, additional_size);
    }

3052 3053 3054 3055
    if (discard_padding) {
        uint8_t *side_data = av_packet_new_side_data(pkt,
                                                     AV_PKT_DATA_SKIP_SAMPLES,
                                                     10);
3056
        if (!side_data) {
3057
            av_packet_unref(pkt);
3058 3059 3060 3061 3062 3063
            av_free(pkt);
            return AVERROR(ENOMEM);
        }
        AV_WL32(side_data, 0);
        AV_WL32(side_data + 4, av_rescale_q(discard_padding,
                                            (AVRational){1, 1000000000},
3064
                                            (AVRational){1, st->codecpar->sample_rate}));
3065 3066
    }

3067 3068 3069 3070 3071
    if (track->ms_compat)
        pkt->dts = timecode;
    else
        pkt->pts = timecode;
    pkt->pos = pos;
3072 3073
    pkt->duration = lace_duration;

3074 3075
#if FF_API_CONVERGENCE_DURATION
FF_DISABLE_DEPRECATION_WARNINGS
3076
    if (st->codecpar->codec_id == AV_CODEC_ID_SUBRIP) {
3077 3078
        pkt->convergence_duration = lace_duration;
    }
3079 3080
FF_ENABLE_DEPRECATION_WARNINGS
#endif
3081

3082 3083
    dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
    matroska->prev_pkt = pkt;
3084 3085

    return 0;
3086

3087 3088 3089 3090
fail:
    if (pkt_data != data)
        av_freep(&pkt_data);
    return res;
3091 3092
}

3093 3094
static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
                                int size, int64_t pos, uint64_t cluster_time,
3095
                                uint64_t block_duration, int is_keyframe,
3096
                                uint8_t *additional, uint64_t additional_id, int additional_size,
3097
                                int64_t cluster_pos, int64_t discard_padding)
3098
{
3099
    uint64_t timecode = AV_NOPTS_VALUE;
3100
    MatroskaTrack *track;
3101
    int res = 0;
3102 3103 3104 3105 3106
    AVStream *st;
    int16_t block_time;
    uint32_t *lace_size = NULL;
    int n, flags, laces = 0;
    uint64_t num;
3107
    int trust_default_duration = 1;
3108

3109
    if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
3110
        av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
3111
        return n;
3112 3113 3114 3115 3116
    }
    data += n;
    size -= n;

    track = matroska_find_track_by_num(matroska, num);
3117
    if (!track || !track->stream) {
3118
        av_log(matroska->ctx, AV_LOG_INFO,
3119
               "Invalid stream %"PRIu64" or size %u\n", num, size);
3120
        return AVERROR_INVALIDDATA;
3121 3122
    } else if (size <= 3)
        return 0;
3123
    st = track->stream;
3124
    if (st->discard >= AVDISCARD_ALL)
3125
        return res;
3126
    av_assert1(block_duration != AV_NOPTS_VALUE);
3127

3128
    block_time = sign_extend(AV_RB16(data), 16);
3129 3130 3131
    data      += 2;
    flags      = *data++;
    size      -= 3;
3132
    if (is_keyframe == -1)
3133
        is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
3134

3135 3136
    if (cluster_time != (uint64_t) -1 &&
        (block_time >= 0 || cluster_time >= -block_time)) {
3137
        timecode = cluster_time + block_time - track->codec_delay_in_track_tb;
3138 3139
        if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE &&
            timecode < track->end_timecode)
3140
            is_keyframe = 0;  /* overlapping subtitles are not key frame */
3141
        if (is_keyframe)
3142 3143
            av_add_index_entry(st, cluster_pos, timecode, 0, 0,
                               AVINDEX_KEYFRAME);
3144 3145
    }

3146 3147
    if (matroska->skip_to_keyframe &&
        track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
3148 3149 3150
        // Compare signed timecodes. Timecode may be negative due to codec delay
        // offset. We don't support timestamps greater than int64_t anyway - see
        // AVPacket's pts.
3151
        if ((int64_t)timecode < (int64_t)matroska->skip_to_timecode)
3152
            return res;
3153 3154 3155
        if (is_keyframe)
            matroska->skip_to_keyframe = 0;
        else if (!st->skip_to_keyframe) {
3156 3157 3158
            av_log(matroska->ctx, AV_LOG_ERROR, "File is broken, keyframes not correctly marked!\n");
            matroska->skip_to_keyframe = 0;
        }
3159 3160
    }

3161
    res = matroska_parse_laces(matroska, &data, &size, (flags & 0x06) >> 1,
3162
                               &lace_size, &laces);
3163

3164 3165
    if (res)
        goto end;
3166

3167 3168
    if (track->audio.samplerate == 8000) {
        // If this is needed for more codecs, then add them here
3169 3170
        if (st->codecpar->codec_id == AV_CODEC_ID_AC3) {
            if (track->audio.samplerate != st->codecpar->sample_rate || !st->codecpar->frame_size)
3171 3172 3173 3174 3175
                trust_default_duration = 0;
        }
    }

    if (!block_duration && trust_default_duration)
3176
        block_duration = track->default_duration * laces / matroska->time_scale;
3177

3178
    if (cluster_time != (uint64_t)-1 && (block_time >= 0 || cluster_time >= -block_time))
3179 3180
        track->end_timecode =
            FFMAX(track->end_timecode, timecode + block_duration);
3181

3182
    for (n = 0; n < laces; n++) {
3183
        int64_t lace_duration = block_duration*(n+1) / laces - block_duration*n / laces;
3184

3185 3186 3187 3188
        if (lace_size[n] > size) {
            av_log(matroska->ctx, AV_LOG_ERROR, "Invalid packet size\n");
            break;
        }
3189

3190 3191 3192 3193 3194
        if ((st->codecpar->codec_id == AV_CODEC_ID_RA_288 ||
             st->codecpar->codec_id == AV_CODEC_ID_COOK   ||
             st->codecpar->codec_id == AV_CODEC_ID_SIPR   ||
             st->codecpar->codec_id == AV_CODEC_ID_ATRAC3) &&
            st->codecpar->block_align && track->audio.sub_packet_size) {
3195 3196
            res = matroska_parse_rm_audio(matroska, track, st, data,
                                          lace_size[n],
3197
                                          timecode, pos);
3198 3199
            if (res)
                goto end;
3200

3201
        } else if (st->codecpar->codec_id == AV_CODEC_ID_WEBVTT) {
3202 3203 3204 3205 3206 3207
            res = matroska_parse_webvtt(matroska, track, st,
                                        data, lace_size[n],
                                        timecode, lace_duration,
                                        pos);
            if (res)
                goto end;
3208 3209
        } else {
            res = matroska_parse_frame(matroska, track, st, data, lace_size[n],
3210 3211 3212 3213
                                       timecode, lace_duration, pos,
                                       !n ? is_keyframe : 0,
                                       additional, additional_id, additional_size,
                                       discard_padding);
3214 3215
            if (res)
                goto end;
3216
        }
3217 3218

        if (timecode != AV_NOPTS_VALUE)
3219
            timecode = lace_duration ? timecode + lace_duration : AV_NOPTS_VALUE;
3220 3221
        data += lace_size[n];
        size -= lace_size[n];
3222 3223
    }

3224
end:
3225
    av_free(lace_size);
3226
    return res;
3227 3228
}

3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243
static int matroska_parse_cluster_incremental(MatroskaDemuxContext *matroska)
{
    EbmlList *blocks_list;
    MatroskaBlock *blocks;
    int i, res;
    res = ebml_parse(matroska,
                     matroska_cluster_incremental_parsing,
                     &matroska->current_cluster);
    if (res == 1) {
        /* New Cluster */
        if (matroska->current_cluster_pos)
            ebml_level_end(matroska);
        ebml_free(matroska_cluster, &matroska->current_cluster);
        memset(&matroska->current_cluster, 0, sizeof(MatroskaCluster));
        matroska->current_cluster_num_blocks = 0;
3244 3245
        matroska->current_cluster_pos        = avio_tell(matroska->ctx->pb);
        matroska->prev_pkt                   = NULL;
3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260
        /* sizeof the ID which was already read */
        if (matroska->current_id)
            matroska->current_cluster_pos -= 4;
        res = ebml_parse(matroska,
                         matroska_clusters_incremental,
                         &matroska->current_cluster);
        /* Try parsing the block again. */
        if (res == 1)
            res = ebml_parse(matroska,
                             matroska_cluster_incremental_parsing,
                             &matroska->current_cluster);
    }

    if (!res &&
        matroska->current_cluster_num_blocks <
3261
        matroska->current_cluster.blocks.nb_elem) {
3262
        blocks_list = &matroska->current_cluster.blocks;
3263
        blocks      = blocks_list->elem;
3264 3265

        matroska->current_cluster_num_blocks = blocks_list->nb_elem;
3266
        i                                    = blocks_list->nb_elem - 1;
3267 3268
        if (blocks[i].bin.size > 0 && blocks[i].bin.data) {
            int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
3269 3270
            uint8_t* additional = blocks[i].additional.size > 0 ?
                                    blocks[i].additional.data : NULL;
3271
            if (!blocks[i].non_simple)
3272
                blocks[i].duration = 0;
3273 3274
            res = matroska_parse_block(matroska, blocks[i].bin.data,
                                       blocks[i].bin.size, blocks[i].bin.pos,
3275 3276
                                       matroska->current_cluster.timecode,
                                       blocks[i].duration, is_keyframe,
3277 3278
                                       additional, blocks[i].additional_id,
                                       blocks[i].additional.size,
3279 3280
                                       matroska->current_cluster_pos,
                                       blocks[i].discard_padding);
3281 3282 3283 3284 3285 3286
        }
    }

    return res;
}

3287
static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
3288
{
3289 3290 3291
    MatroskaCluster cluster = { 0 };
    EbmlList *blocks_list;
    MatroskaBlock *blocks;
3292
    int i, res;
3293
    int64_t pos;
3294

3295 3296 3297
    if (!matroska->contains_ssa)
        return matroska_parse_cluster_incremental(matroska);
    pos = avio_tell(matroska->ctx->pb);
3298
    matroska->prev_pkt = NULL;
3299
    if (matroska->current_id)
3300
        pos -= 4;  /* sizeof the ID which was already read */
3301
    res         = ebml_parse(matroska, matroska_clusters, &cluster);
3302
    blocks_list = &cluster.blocks;
3303
    blocks      = blocks_list->elem;
3304
    for (i = 0; i < blocks_list->nb_elem; i++)
3305
        if (blocks[i].bin.size > 0 && blocks[i].bin.data) {
3306
            int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
3307 3308 3309
            res = matroska_parse_block(matroska, blocks[i].bin.data,
                                       blocks[i].bin.size, blocks[i].bin.pos,
                                       cluster.timecode, blocks[i].duration,
3310 3311
                                       is_keyframe, NULL, 0, 0, pos,
                                       blocks[i].discard_padding);
3312
        }
3313
    ebml_free(matroska_cluster, &cluster);
3314 3315 3316
    return res;
}

3317
static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
3318 3319 3320
{
    MatroskaDemuxContext *matroska = s->priv_data;

3321
    while (matroska_deliver_packet(matroska, pkt)) {
3322
        int64_t pos = avio_tell(matroska->ctx->pb);
3323
        if (matroska->done)
3324
            return AVERROR_EOF;
3325 3326
        if (matroska_parse_cluster(matroska) < 0)
            matroska_resync(matroska, pos);
3327 3328
    }

3329
    return 0;
3330 3331
}

3332 3333
static int matroska_read_seek(AVFormatContext *s, int stream_index,
                              int64_t timestamp, int flags)
3334 3335
{
    MatroskaDemuxContext *matroska = s->priv_data;
3336
    MatroskaTrack *tracks = NULL;
3337
    AVStream *st = s->streams[stream_index];
3338
    int i, index, index_sub, index_min;
3339

3340
    /* Parse the CUES now since we need the index data to seek. */
3341
    if (matroska->cues_parsing_deferred > 0) {
3342
        matroska->cues_parsing_deferred = 0;
3343
        matroska_parse_cues(matroska);
3344 3345
    }

3346
    if (!st->nb_index_entries)
3347
        goto err;
3348
    timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
3349

3350
    if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
3351 3352
        avio_seek(s->pb, st->index_entries[st->nb_index_entries - 1].pos,
                  SEEK_SET);
3353
        matroska->current_id = 0;
3354
        while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
3355 3356 3357 3358
            matroska_clear_queue(matroska);
            if (matroska_parse_cluster(matroska) < 0)
                break;
        }
3359
    }
3360

3361
    matroska_clear_queue(matroska);
3362 3363
    if (index < 0 || (matroska->cues_parsing_deferred < 0 && index == st->nb_index_entries - 1))
        goto err;
3364

3365
    index_min = index;
3366
    tracks = matroska->tracks.elem;
3367 3368
    for (i = 0; i < matroska->tracks.nb_elem; i++) {
        tracks[i].audio.pkt_cnt        = 0;
3369
        tracks[i].audio.sub_packet_cnt = 0;
3370 3371 3372
        tracks[i].audio.buf_timecode   = AV_NOPTS_VALUE;
        tracks[i].end_timecode         = 0;
        if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE &&
3373
            tracks[i].stream &&
3374
            tracks[i].stream->discard != AVDISCARD_ALL) {
3375 3376 3377
            index_sub = av_index_search_timestamp(
                tracks[i].stream, st->index_entries[index].timestamp,
                AVSEEK_FLAG_BACKWARD);
3378
            while (index_sub >= 0 &&
3379
                  index_min > 0 &&
3380 3381
                  tracks[i].stream->index_entries[index_sub].pos < st->index_entries[index_min].pos &&
                  st->index_entries[index].timestamp - tracks[i].stream->index_entries[index_sub].timestamp < 30000000000 / matroska->time_scale)
3382
                index_min--;
3383 3384 3385
        }
    }

3386
    avio_seek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
3387
    matroska->current_id       = 0;
3388 3389 3390 3391 3392 3393 3394 3395
    if (flags & AVSEEK_FLAG_ANY) {
        st->skip_to_keyframe = 0;
        matroska->skip_to_timecode = timestamp;
    } else {
        st->skip_to_keyframe = 1;
        matroska->skip_to_timecode = st->index_entries[index].timestamp;
    }
    matroska->skip_to_keyframe = 1;
3396
    matroska->done             = 0;
3397
    matroska->num_levels       = 0;
3398
    ff_update_cur_dts(s, st, st->index_entries[index].timestamp);
3399
    return 0;
3400 3401 3402 3403 3404
err:
    // slightly hackish but allows proper fallback to
    // the generic seeking code.
    matroska_clear_queue(matroska);
    matroska->current_id = 0;
3405
    st->skip_to_keyframe =
3406 3407 3408 3409
    matroska->skip_to_keyframe = 0;
    matroska->done = 0;
    matroska->num_levels = 0;
    return -1;
3410 3411
}

3412
static int matroska_read_close(AVFormatContext *s)
3413 3414
{
    MatroskaDemuxContext *matroska = s->priv_data;
3415
    MatroskaTrack *tracks = matroska->tracks.elem;
3416
    int n;
3417

3418
    matroska_clear_queue(matroska);
3419

3420
    for (n = 0; n < matroska->tracks.nb_elem; n++)
3421
        if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
3422
            av_freep(&tracks[n].audio.buf);
3423
    ebml_free(matroska_cluster, &matroska->current_cluster);
3424
    ebml_free(matroska_segment, matroska);
3425 3426 3427 3428

    return 0;
}

3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593
typedef struct {
    int64_t start_time_ns;
    int64_t end_time_ns;
    int64_t start_offset;
    int64_t end_offset;
} CueDesc;

/* This function searches all the Cues and returns the CueDesc corresponding the
 * the timestamp ts. Returned CueDesc will be such that start_time_ns <= ts <
 * end_time_ns. All 4 fields will be set to -1 if ts >= file's duration.
 */
static CueDesc get_cue_desc(AVFormatContext *s, int64_t ts, int64_t cues_start) {
    MatroskaDemuxContext *matroska = s->priv_data;
    CueDesc cue_desc;
    int i;
    int nb_index_entries = s->streams[0]->nb_index_entries;
    AVIndexEntry *index_entries = s->streams[0]->index_entries;
    if (ts >= matroska->duration * matroska->time_scale) return (CueDesc) {-1, -1, -1, -1};
    for (i = 1; i < nb_index_entries; i++) {
        if (index_entries[i - 1].timestamp * matroska->time_scale <= ts &&
            index_entries[i].timestamp * matroska->time_scale > ts) {
            break;
        }
    }
    --i;
    cue_desc.start_time_ns = index_entries[i].timestamp * matroska->time_scale;
    cue_desc.start_offset = index_entries[i].pos - matroska->segment_start;
    if (i != nb_index_entries - 1) {
        cue_desc.end_time_ns = index_entries[i + 1].timestamp * matroska->time_scale;
        cue_desc.end_offset = index_entries[i + 1].pos - matroska->segment_start;
    } else {
        cue_desc.end_time_ns = matroska->duration * matroska->time_scale;
        // FIXME: this needs special handling for files where Cues appear
        // before Clusters. the current logic assumes Cues appear after
        // Clusters.
        cue_desc.end_offset = cues_start - matroska->segment_start;
    }
    return cue_desc;
}

static int webm_clusters_start_with_keyframe(AVFormatContext *s)
{
    MatroskaDemuxContext *matroska = s->priv_data;
    int64_t cluster_pos, before_pos;
    int index, rv = 1;
    if (s->streams[0]->nb_index_entries <= 0) return 0;
    // seek to the first cluster using cues.
    index = av_index_search_timestamp(s->streams[0], 0, 0);
    if (index < 0)  return 0;
    cluster_pos = s->streams[0]->index_entries[index].pos;
    before_pos = avio_tell(s->pb);
    while (1) {
        int64_t cluster_id = 0, cluster_length = 0;
        AVPacket *pkt;
        avio_seek(s->pb, cluster_pos, SEEK_SET);
        // read cluster id and length
        ebml_read_num(matroska, matroska->ctx->pb, 4, &cluster_id);
        ebml_read_length(matroska, matroska->ctx->pb, &cluster_length);
        if (cluster_id != 0xF43B675) { // done with all clusters
            break;
        }
        avio_seek(s->pb, cluster_pos, SEEK_SET);
        matroska->current_id = 0;
        matroska_clear_queue(matroska);
        if (matroska_parse_cluster(matroska) < 0 ||
            matroska->num_packets <= 0) {
            break;
        }
        pkt = matroska->packets[0];
        cluster_pos += cluster_length + 12; // 12 is the offset of the cluster id and length.
        if (!(pkt->flags & AV_PKT_FLAG_KEY)) {
            rv = 0;
            break;
        }
    }
    avio_seek(s->pb, before_pos, SEEK_SET);
    return rv;
}

static int buffer_size_after_time_downloaded(int64_t time_ns, double search_sec, int64_t bps,
                                             double min_buffer, double* buffer,
                                             double* sec_to_download, AVFormatContext *s,
                                             int64_t cues_start)
{
    double nano_seconds_per_second = 1000000000.0;
    double time_sec = time_ns / nano_seconds_per_second;
    int rv = 0;
    int64_t time_to_search_ns = (int64_t)(search_sec * nano_seconds_per_second);
    int64_t end_time_ns = time_ns + time_to_search_ns;
    double sec_downloaded = 0.0;
    CueDesc desc_curr = get_cue_desc(s, time_ns, cues_start);
    if (desc_curr.start_time_ns == -1)
      return -1;
    *sec_to_download = 0.0;

    // Check for non cue start time.
    if (time_ns > desc_curr.start_time_ns) {
      int64_t cue_nano = desc_curr.end_time_ns - time_ns;
      double percent = (double)(cue_nano) / (desc_curr.end_time_ns - desc_curr.start_time_ns);
      double cueBytes = (desc_curr.end_offset - desc_curr.start_offset) * percent;
      double timeToDownload = (cueBytes * 8.0) / bps;

      sec_downloaded += (cue_nano / nano_seconds_per_second) - timeToDownload;
      *sec_to_download += timeToDownload;

      // Check if the search ends within the first cue.
      if (desc_curr.end_time_ns >= end_time_ns) {
          double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
          double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
          sec_downloaded = percent_to_sub * sec_downloaded;
          *sec_to_download = percent_to_sub * *sec_to_download;
      }

      if ((sec_downloaded + *buffer) <= min_buffer) {
          return 1;
      }

      // Get the next Cue.
      desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
    }

    while (desc_curr.start_time_ns != -1) {
        int64_t desc_bytes = desc_curr.end_offset - desc_curr.start_offset;
        int64_t desc_ns = desc_curr.end_time_ns - desc_curr.start_time_ns;
        double desc_sec = desc_ns / nano_seconds_per_second;
        double bits = (desc_bytes * 8.0);
        double time_to_download = bits / bps;

        sec_downloaded += desc_sec - time_to_download;
        *sec_to_download += time_to_download;

        if (desc_curr.end_time_ns >= end_time_ns) {
            double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
            double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
            sec_downloaded = percent_to_sub * sec_downloaded;
            *sec_to_download = percent_to_sub * *sec_to_download;

            if ((sec_downloaded + *buffer) <= min_buffer)
                rv = 1;
            break;
        }

        if ((sec_downloaded + *buffer) <= min_buffer) {
            rv = 1;
            break;
        }

        desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
    }
    *buffer = *buffer + sec_downloaded;
    return rv;
}

/* This function computes the bandwidth of the WebM file with the help of
 * buffer_size_after_time_downloaded() function. Both of these functions are
 * adapted from WebM Tools project and are adapted to work with FFmpeg's
 * Matroska parsing mechanism.
 *
 * Returns the bandwidth of the file on success; -1 on error.
 * */
static int64_t webm_dash_manifest_compute_bandwidth(AVFormatContext *s, int64_t cues_start)
{
    MatroskaDemuxContext *matroska = s->priv_data;
    AVStream *st = s->streams[0];
    double bandwidth = 0.0;
3594 3595 3596
    int i;

    for (i = 0; i < st->nb_index_entries; i++) {
3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619
        int64_t prebuffer_ns = 1000000000;
        int64_t time_ns = st->index_entries[i].timestamp * matroska->time_scale;
        double nano_seconds_per_second = 1000000000.0;
        int64_t prebuffered_ns = time_ns + prebuffer_ns;
        double prebuffer_bytes = 0.0;
        int64_t temp_prebuffer_ns = prebuffer_ns;
        int64_t pre_bytes, pre_ns;
        double pre_sec, prebuffer, bits_per_second;
        CueDesc desc_beg = get_cue_desc(s, time_ns, cues_start);

        // Start with the first Cue.
        CueDesc desc_end = desc_beg;

        // Figure out how much data we have downloaded for the prebuffer. This will
        // be used later to adjust the bits per sample to try.
        while (desc_end.start_time_ns != -1 && desc_end.end_time_ns < prebuffered_ns) {
            // Prebuffered the entire Cue.
            prebuffer_bytes += desc_end.end_offset - desc_end.start_offset;
            temp_prebuffer_ns -= desc_end.end_time_ns - desc_end.start_time_ns;
            desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
        }
        if (desc_end.start_time_ns == -1) {
            // The prebuffer is larger than the duration.
3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665
            if (matroska->duration * matroska->time_scale >= prebuffered_ns)
              return -1;
            bits_per_second = 0.0;
        } else {
            // The prebuffer ends in the last Cue. Estimate how much data was
            // prebuffered.
            pre_bytes = desc_end.end_offset - desc_end.start_offset;
            pre_ns = desc_end.end_time_ns - desc_end.start_time_ns;
            pre_sec = pre_ns / nano_seconds_per_second;
            prebuffer_bytes +=
                pre_bytes * ((temp_prebuffer_ns / nano_seconds_per_second) / pre_sec);

            prebuffer = prebuffer_ns / nano_seconds_per_second;

            // Set this to 0.0 in case our prebuffer buffers the entire video.
            bits_per_second = 0.0;
            do {
                int64_t desc_bytes = desc_end.end_offset - desc_beg.start_offset;
                int64_t desc_ns = desc_end.end_time_ns - desc_beg.start_time_ns;
                double desc_sec = desc_ns / nano_seconds_per_second;
                double calc_bits_per_second = (desc_bytes * 8) / desc_sec;

                // Drop the bps by the percentage of bytes buffered.
                double percent = (desc_bytes - prebuffer_bytes) / desc_bytes;
                double mod_bits_per_second = calc_bits_per_second * percent;

                if (prebuffer < desc_sec) {
                    double search_sec =
                        (double)(matroska->duration * matroska->time_scale) / nano_seconds_per_second;

                    // Add 1 so the bits per second should be a little bit greater than file
                    // datarate.
                    int64_t bps = (int64_t)(mod_bits_per_second) + 1;
                    const double min_buffer = 0.0;
                    double buffer = prebuffer;
                    double sec_to_download = 0.0;

                    int rv = buffer_size_after_time_downloaded(prebuffered_ns, search_sec, bps,
                                                               min_buffer, &buffer, &sec_to_download,
                                                               s, cues_start);
                    if (rv < 0) {
                        return -1;
                    } else if (rv == 0) {
                        bits_per_second = (double)(bps);
                        break;
                    }
3666 3667
                }

3668 3669 3670
                desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
            } while (desc_end.start_time_ns != -1);
        }
3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681
        if (bandwidth < bits_per_second) bandwidth = bits_per_second;
    }
    return (int64_t)bandwidth;
}

static int webm_dash_manifest_cues(AVFormatContext *s)
{
    MatroskaDemuxContext *matroska = s->priv_data;
    EbmlList *seekhead_list = &matroska->seekhead;
    MatroskaSeekhead *seekhead = seekhead_list->elem;
    char *buf;
3682
    int64_t cues_start = -1, cues_end = -1, before_pos, bandwidth;
3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694
    int i;

    // determine cues start and end positions
    for (i = 0; i < seekhead_list->nb_elem; i++)
        if (seekhead[i].id == MATROSKA_ID_CUES)
            break;

    if (i >= seekhead_list->nb_elem) return -1;

    before_pos = avio_tell(matroska->ctx->pb);
    cues_start = seekhead[i].pos + matroska->segment_start;
    if (avio_seek(matroska->ctx->pb, cues_start, SEEK_SET) == cues_start) {
3695 3696 3697 3698 3699 3700 3701
        // cues_end is computed as cues_start + cues_length + length of the
        // Cues element ID + EBML length of the Cues element. cues_end is
        // inclusive and the above sum is reduced by 1.
        uint64_t cues_length = 0, cues_id = 0, bytes_read = 0;
        bytes_read += ebml_read_num(matroska, matroska->ctx->pb, 4, &cues_id);
        bytes_read += ebml_read_length(matroska, matroska->ctx->pb, &cues_length);
        cues_end = cues_start + cues_length + bytes_read - 1;
3702 3703
    }
    avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
3704
    if (cues_start == -1 || cues_end == -1) return -1;
3705 3706 3707 3708 3709

    // parse the cues
    matroska_parse_cues(matroska);

    // cues start
3710
    av_dict_set_int(&s->streams[0]->metadata, CUES_START, cues_start, 0);
3711 3712

    // cues end
3713
    av_dict_set_int(&s->streams[0]->metadata, CUES_END, cues_end, 0);
3714 3715 3716 3717

    // bandwidth
    bandwidth = webm_dash_manifest_compute_bandwidth(s, cues_start);
    if (bandwidth < 0) return -1;
3718
    av_dict_set_int(&s->streams[0]->metadata, BANDWIDTH, bandwidth, 0);
3719 3720

    // check if all clusters start with key frames
3721
    av_dict_set_int(&s->streams[0]->metadata, CLUSTER_KEYFRAME, webm_clusters_start_with_keyframe(s), 0);
3722 3723 3724

    // store cue point timestamps as a comma separated list for checking subsegment alignment in
    // the muxer. assumes that each timestamp cannot be more than 20 characters long.
3725
    buf = av_malloc_array(s->streams[0]->nb_index_entries, 20 * sizeof(char));
3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750
    if (!buf) return -1;
    strcpy(buf, "");
    for (i = 0; i < s->streams[0]->nb_index_entries; i++) {
        snprintf(buf, (i + 1) * 20 * sizeof(char),
                 "%s%" PRId64, buf, s->streams[0]->index_entries[i].timestamp);
        if (i != s->streams[0]->nb_index_entries - 1)
            strncat(buf, ",", sizeof(char));
    }
    av_dict_set(&s->streams[0]->metadata, CUE_TIMESTAMPS, buf, 0);
    av_free(buf);

    return 0;
}

static int webm_dash_manifest_read_header(AVFormatContext *s)
{
    char *buf;
    int ret = matroska_read_header(s);
    MatroskaTrack *tracks;
    MatroskaDemuxContext *matroska = s->priv_data;
    if (ret) {
        av_log(s, AV_LOG_ERROR, "Failed to read file headers\n");
        return -1;
    }

3751 3752 3753 3754 3755 3756 3757 3758 3759 3760
    if (!matroska->is_live) {
        buf = av_asprintf("%g", matroska->duration);
        if (!buf) return AVERROR(ENOMEM);
        av_dict_set(&s->streams[0]->metadata, DURATION, buf, 0);
        av_free(buf);

        // initialization range
        // 5 is the offset of Cluster ID.
        av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, avio_tell(s->pb) - 5, 0);
    }
3761 3762 3763

    // basename of the file
    buf = strrchr(s->filename, '/');
3764
    av_dict_set(&s->streams[0]->metadata, FILENAME, buf ? ++buf : s->filename, 0);
3765 3766 3767

    // track number
    tracks = matroska->tracks.elem;
3768
    av_dict_set_int(&s->streams[0]->metadata, TRACK_NUMBER, tracks[0].num, 0);
3769 3770

    // parse the cues and populate Cue related fields
3771
    return matroska->is_live ? 0 : webm_dash_manifest_cues(s);
3772 3773 3774 3775 3776 3777 3778
}

static int webm_dash_manifest_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    return AVERROR_EOF;
}

3779 3780
#define OFFSET(x) offsetof(MatroskaDemuxContext, x)
static const AVOption options[] = {
3781
    { "live", "flag indicating that the input is a live file that only has the headers.", OFFSET(is_live), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
3782 3783 3784 3785 3786 3787 3788 3789 3790 3791
    { NULL },
};

static const AVClass webm_dash_class = {
    .class_name = "WebM DASH Manifest demuxer",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
};

3792
AVInputFormat ff_matroska_demuxer = {
3793
    .name           = "matroska,webm",
3794
    .long_name      = NULL_IF_CONFIG_SMALL("Matroska / WebM"),
3795
    .extensions     = "mkv,mk3d,mka,mks",
3796 3797 3798 3799 3800 3801
    .priv_data_size = sizeof(MatroskaDemuxContext),
    .read_probe     = matroska_probe,
    .read_header    = matroska_read_header,
    .read_packet    = matroska_read_packet,
    .read_close     = matroska_read_close,
    .read_seek      = matroska_read_seek,
3802
    .mime_type      = "audio/webm,audio/x-matroska,video/webm,video/x-matroska"
3803
};
3804 3805 3806 3807 3808 3809 3810 3811

AVInputFormat ff_webm_dash_manifest_demuxer = {
    .name           = "webm_dash_manifest",
    .long_name      = NULL_IF_CONFIG_SMALL("WebM DASH Manifest"),
    .priv_data_size = sizeof(MatroskaDemuxContext),
    .read_header    = webm_dash_manifest_read_header,
    .read_packet    = webm_dash_manifest_read_packet,
    .read_close     = matroska_read_close,
3812
    .priv_class     = &webm_dash_class,
3813
};