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ffmpeg / libavformat / matroskadec.c @ dfbbbdc0

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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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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file matroskadec.c
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 * Matroska file demuxer
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 * by Ronald Bultje <rbultje@ronald.bitfreak.net>
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 * with a little help from Moritz Bunkus <moritz@bunkus.org>
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 * totally reworked by Aurelien Jacobs <aurel@gnuage.org>
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 * Specs available on the Matroska project page: http://www.matroska.org/.
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 */
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#include "avformat.h"
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/* For codec_get_id(). */
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#include "riff.h"
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#include "isom.h"
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#include "matroska.h"
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#include "libavcodec/mpeg4audio.h"
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#include "libavutil/intfloat_readwrite.h"
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#include "libavutil/avstring.h"
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#include "libavutil/lzo.h"
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#ifdef CONFIG_ZLIB
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#include <zlib.h>
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#endif
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#ifdef CONFIG_BZLIB
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#include <bzlib.h>
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#endif
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typedef enum {
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    EBML_NONE,
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    EBML_UINT,
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    EBML_FLOAT,
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    EBML_STR,
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    EBML_UTF8,
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    EBML_BIN,
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    EBML_NEST,
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    EBML_PASS,
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    EBML_STOP,
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} EbmlType;
58

    
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typedef const struct EbmlSyntax {
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    uint32_t id;
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    EbmlType type;
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    int list_elem_size;
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    int data_offset;
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    union {
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        uint64_t    u;
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        double      f;
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        const char *s;
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        const struct EbmlSyntax *n;
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    } def;
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} EbmlSyntax;
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typedef struct {
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    int nb_elem;
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    void *elem;
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} EbmlList;
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typedef struct {
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    int      size;
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    uint8_t *data;
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    int64_t  pos;
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} EbmlBin;
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typedef struct {
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    uint64_t version;
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    uint64_t max_size;
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    uint64_t id_length;
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    char    *doctype;
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    uint64_t doctype_version;
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} Ebml;
90

    
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typedef struct {
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    uint64_t algo;
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    EbmlBin  settings;
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} MatroskaTrackCompression;
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typedef struct {
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    uint64_t scope;
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    uint64_t type;
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    MatroskaTrackCompression compression;
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} MatroskaTrackEncoding;
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typedef struct {
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    double   frame_rate;
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    uint64_t display_width;
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    uint64_t display_height;
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    uint64_t pixel_width;
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    uint64_t pixel_height;
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    uint64_t fourcc;
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} MatroskaTrackVideo;
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typedef struct {
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    double   samplerate;
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    double   out_samplerate;
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    uint64_t bitdepth;
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    uint64_t channels;
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    /* real audio header (extracted from extradata) */
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    int      coded_framesize;
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    int      sub_packet_h;
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    int      frame_size;
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    int      sub_packet_size;
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    int      sub_packet_cnt;
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    int      pkt_cnt;
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    uint8_t *buf;
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} MatroskaTrackAudio;
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typedef struct {
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    uint64_t num;
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    uint64_t type;
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    char    *codec_id;
131
    EbmlBin  codec_priv;
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    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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    MatroskaTrackVideo video;
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    MatroskaTrackAudio audio;
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    EbmlList encodings;
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    AVStream *stream;
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} MatroskaTrack;
142

    
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typedef struct {
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    char *filename;
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    char *mime;
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    EbmlBin bin;
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} MatroskaAttachement;
148

    
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typedef struct {
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    uint64_t start;
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    uint64_t end;
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    uint64_t uid;
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    char    *title;
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} MatroskaChapter;
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typedef struct {
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    uint64_t track;
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    uint64_t pos;
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} MatroskaIndexPos;
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typedef struct {
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    uint64_t time;
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    EbmlList pos;
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} MatroskaIndex;
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typedef struct {
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    char *name;
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    char *string;
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    EbmlList sub;
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} MatroskaTag;
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typedef struct {
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    uint64_t id;
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    uint64_t pos;
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} MatroskaSeekhead;
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typedef struct {
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    uint64_t start;
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    uint64_t length;
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} MatroskaLevel;
181

    
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typedef struct {
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    AVFormatContext *ctx;
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    /* EBML stuff */
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    int num_levels;
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    MatroskaLevel levels[EBML_MAX_DEPTH];
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    int level_up;
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    uint64_t time_scale;
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    double   duration;
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    char    *title;
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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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    offset_t segment_start;
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    /* the packet queue */
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    AVPacket **packets;
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    int num_packets;
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    int done;
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    int has_cluster_id;
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    /* What to skip before effectively reading a packet. */
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    int skip_to_keyframe;
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    AVStream *skip_to_stream;
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} MatroskaDemuxContext;
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typedef struct {
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    uint64_t duration;
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    int64_t  reference;
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    EbmlBin  bin;
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} MatroskaBlock;
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typedef struct {
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    uint64_t timecode;
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    EbmlList blocks;
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} MatroskaCluster;
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#define ARRAY_SIZE(x)  (sizeof(x)/sizeof(*x))
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static EbmlSyntax ebml_header[] = {
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    { EBML_ID_EBMLREADVERSION,        EBML_UINT, 0, offsetof(Ebml,version), {.u=EBML_VERSION} },
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    { EBML_ID_EBMLMAXSIZELENGTH,      EBML_UINT, 0, offsetof(Ebml,max_size), {.u=8} },
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    { EBML_ID_EBMLMAXIDLENGTH,        EBML_UINT, 0, offsetof(Ebml,id_length), {.u=4} },
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    { EBML_ID_DOCTYPE,                EBML_STR,  0, offsetof(Ebml,doctype), {.s="(none)"} },
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    { EBML_ID_DOCTYPEREADVERSION,     EBML_UINT, 0, offsetof(Ebml,doctype_version), {.u=1} },
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    { EBML_ID_EBMLVERSION,            EBML_NONE },
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    { EBML_ID_DOCTYPEVERSION,         EBML_NONE },
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    { 0 }
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};
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static 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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};
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static EbmlSyntax matroska_info[] = {
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    { MATROSKA_ID_TIMECODESCALE,      EBML_UINT,  0, offsetof(MatroskaDemuxContext,time_scale), {.u=1000000} },
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    { MATROSKA_ID_DURATION,           EBML_FLOAT, 0, offsetof(MatroskaDemuxContext,duration) },
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    { MATROSKA_ID_TITLE,              EBML_UTF8,  0, offsetof(MatroskaDemuxContext,title) },
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    { MATROSKA_ID_WRITINGAPP,         EBML_NONE },
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    { MATROSKA_ID_MUXINGAPP,          EBML_NONE },
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    { MATROSKA_ID_DATEUTC,            EBML_NONE },
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    { MATROSKA_ID_SEGMENTUID,         EBML_NONE },
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    { 0 }
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};
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static 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) },
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    { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_height) },
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    { MATROSKA_ID_VIDEOPIXELWIDTH,    EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_width) },
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    { MATROSKA_ID_VIDEOPIXELHEIGHT,   EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_height) },
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    { MATROSKA_ID_VIDEOCOLORSPACE,    EBML_UINT, 0, offsetof(MatroskaTrackVideo,fourcc) },
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    { MATROSKA_ID_VIDEOPIXELCROPB,    EBML_NONE },
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    { MATROSKA_ID_VIDEOPIXELCROPT,    EBML_NONE },
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    { MATROSKA_ID_VIDEOPIXELCROPL,    EBML_NONE },
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    { MATROSKA_ID_VIDEOPIXELCROPR,    EBML_NONE },
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    { MATROSKA_ID_VIDEODISPLAYUNIT,   EBML_NONE },
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    { MATROSKA_ID_VIDEOFLAGINTERLACED,EBML_NONE },
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    { MATROSKA_ID_VIDEOSTEREOMODE,    EBML_NONE },
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    { MATROSKA_ID_VIDEOASPECTRATIO,   EBML_NONE },
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    { 0 }
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};
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static EbmlSyntax matroska_track_audio[] = {
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    { MATROSKA_ID_AUDIOSAMPLINGFREQ,  EBML_FLOAT,0, offsetof(MatroskaTrackAudio,samplerate), {.f=8000.0} },
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    { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ,EBML_FLOAT,0,offsetof(MatroskaTrackAudio,out_samplerate) },
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    { MATROSKA_ID_AUDIOBITDEPTH,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,bitdepth) },
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    { MATROSKA_ID_AUDIOCHANNELS,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,channels), {.u=1} },
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    { 0 }
279
};
280

    
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static EbmlSyntax matroska_track_encoding_compression[] = {
282
    { MATROSKA_ID_ENCODINGCOMPALGO,   EBML_UINT, 0, offsetof(MatroskaTrackCompression,algo), {.u=0} },
283
    { MATROSKA_ID_ENCODINGCOMPSETTINGS,EBML_BIN, 0, offsetof(MatroskaTrackCompression,settings) },
284
    { 0 }
285
};
286

    
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static EbmlSyntax matroska_track_encoding[] = {
288
    { MATROSKA_ID_ENCODINGSCOPE,      EBML_UINT, 0, offsetof(MatroskaTrackEncoding,scope), {.u=1} },
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    { MATROSKA_ID_ENCODINGTYPE,       EBML_UINT, 0, offsetof(MatroskaTrackEncoding,type), {.u=0} },
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    { MATROSKA_ID_ENCODINGCOMPRESSION,EBML_NEST, 0, offsetof(MatroskaTrackEncoding,compression), {.n=matroska_track_encoding_compression} },
291
    { MATROSKA_ID_ENCODINGORDER,      EBML_NONE },
292
    { 0 }
293
};
294

    
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static EbmlSyntax matroska_track_encodings[] = {
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    { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack,encodings), {.n=matroska_track_encoding} },
297
    { 0 }
298
};
299

    
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static EbmlSyntax matroska_track[] = {
301
    { MATROSKA_ID_TRACKNUMBER,          EBML_UINT, 0, offsetof(MatroskaTrack,num) },
302
    { MATROSKA_ID_TRACKTYPE,            EBML_UINT, 0, offsetof(MatroskaTrack,type) },
303
    { MATROSKA_ID_CODECID,              EBML_STR,  0, offsetof(MatroskaTrack,codec_id) },
304
    { MATROSKA_ID_CODECPRIVATE,         EBML_BIN,  0, offsetof(MatroskaTrack,codec_priv) },
305
    { MATROSKA_ID_TRACKLANGUAGE,        EBML_UTF8, 0, offsetof(MatroskaTrack,language), {.s="eng"} },
306
    { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack,default_duration) },
307
    { MATROSKA_ID_TRACKTIMECODESCALE,   EBML_FLOAT,0, offsetof(MatroskaTrack,time_scale), {.f=1.0} },
308
    { MATROSKA_ID_TRACKFLAGDEFAULT,     EBML_UINT, 0, offsetof(MatroskaTrack,flag_default), {.u=1} },
309
    { MATROSKA_ID_TRACKVIDEO,           EBML_NEST, 0, offsetof(MatroskaTrack,video), {.n=matroska_track_video} },
310
    { MATROSKA_ID_TRACKAUDIO,           EBML_NEST, 0, offsetof(MatroskaTrack,audio), {.n=matroska_track_audio} },
311
    { MATROSKA_ID_TRACKCONTENTENCODINGS,EBML_NEST, 0, 0, {.n=matroska_track_encodings} },
312
    { MATROSKA_ID_TRACKUID,             EBML_NONE },
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    { MATROSKA_ID_TRACKNAME,            EBML_NONE },
314
    { MATROSKA_ID_TRACKFLAGENABLED,     EBML_NONE },
315
    { MATROSKA_ID_TRACKFLAGFORCED,      EBML_NONE },
316
    { MATROSKA_ID_TRACKFLAGLACING,      EBML_NONE },
317
    { MATROSKA_ID_CODECNAME,            EBML_NONE },
318
    { MATROSKA_ID_CODECDECODEALL,       EBML_NONE },
319
    { MATROSKA_ID_CODECINFOURL,         EBML_NONE },
320
    { MATROSKA_ID_CODECDOWNLOADURL,     EBML_NONE },
321
    { MATROSKA_ID_TRACKMINCACHE,        EBML_NONE },
322
    { MATROSKA_ID_TRACKMAXCACHE,        EBML_NONE },
323
    { MATROSKA_ID_TRACKMAXBLKADDID,     EBML_NONE },
324
    { 0 }
325
};
326

    
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static EbmlSyntax matroska_tracks[] = {
328
    { MATROSKA_ID_TRACKENTRY,         EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext,tracks), {.n=matroska_track} },
329
    { 0 }
330
};
331

    
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static EbmlSyntax matroska_attachment[] = {
333
    { MATROSKA_ID_FILENAME,           EBML_UTF8, 0, offsetof(MatroskaAttachement,filename) },
334
    { MATROSKA_ID_FILEMIMETYPE,       EBML_STR,  0, offsetof(MatroskaAttachement,mime) },
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    { MATROSKA_ID_FILEDATA,           EBML_BIN,  0, offsetof(MatroskaAttachement,bin) },
336
    { MATROSKA_ID_FILEDESC,           EBML_NONE },
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    { MATROSKA_ID_FILEUID,            EBML_NONE },
338
    { 0 }
339
};
340

    
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static EbmlSyntax matroska_attachments[] = {
342
    { MATROSKA_ID_ATTACHEDFILE,       EBML_NEST, sizeof(MatroskaAttachement), offsetof(MatroskaDemuxContext,attachments), {.n=matroska_attachment} },
343
    { 0 }
344
};
345

    
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static EbmlSyntax matroska_chapter_display[] = {
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    { MATROSKA_ID_CHAPSTRING,         EBML_UTF8, 0, offsetof(MatroskaChapter,title) },
348
    { MATROSKA_ID_CHAPLANG,           EBML_NONE },
349
    { 0 }
350
};
351

    
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static EbmlSyntax matroska_chapter_entry[] = {
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    { MATROSKA_ID_CHAPTERTIMESTART,   EBML_UINT, 0, offsetof(MatroskaChapter,start), {.u=AV_NOPTS_VALUE} },
354
    { MATROSKA_ID_CHAPTERTIMEEND,     EBML_UINT, 0, offsetof(MatroskaChapter,end), {.u=AV_NOPTS_VALUE} },
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    { MATROSKA_ID_CHAPTERUID,         EBML_UINT, 0, offsetof(MatroskaChapter,uid) },
356
    { MATROSKA_ID_CHAPTERDISPLAY,     EBML_NEST, 0, 0, {.n=matroska_chapter_display} },
357
    { MATROSKA_ID_CHAPTERFLAGHIDDEN,  EBML_NONE },
358
    { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
359
    { MATROSKA_ID_CHAPTERPHYSEQUIV,   EBML_NONE },
360
    { MATROSKA_ID_CHAPTERATOM,        EBML_NONE },
361
    { 0 }
362
};
363

    
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static EbmlSyntax matroska_chapter[] = {
365
    { MATROSKA_ID_CHAPTERATOM,        EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext,chapters), {.n=matroska_chapter_entry} },
366
    { MATROSKA_ID_EDITIONUID,         EBML_NONE },
367
    { MATROSKA_ID_EDITIONFLAGHIDDEN,  EBML_NONE },
368
    { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
369
    { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
370
    { 0 }
371
};
372

    
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static EbmlSyntax matroska_chapters[] = {
374
    { MATROSKA_ID_EDITIONENTRY,       EBML_NEST, 0, 0, {.n=matroska_chapter} },
375
    { 0 }
376
};
377

    
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static EbmlSyntax matroska_index_pos[] = {
379
    { MATROSKA_ID_CUETRACK,           EBML_UINT, 0, offsetof(MatroskaIndexPos,track) },
380
    { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos,pos)   },
381
    { MATROSKA_ID_CUEBLOCKNUMBER,     EBML_NONE },
382
    { 0 }
383
};
384

    
385
static EbmlSyntax matroska_index_entry[] = {
386
    { MATROSKA_ID_CUETIME,            EBML_UINT, 0, offsetof(MatroskaIndex,time) },
387
    { MATROSKA_ID_CUETRACKPOSITION,   EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex,pos), {.n=matroska_index_pos} },
388
    { 0 }
389
};
390

    
391
static EbmlSyntax matroska_index[] = {
392
    { MATROSKA_ID_POINTENTRY,         EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext,index), {.n=matroska_index_entry} },
393
    { 0 }
394
};
395

    
396
static EbmlSyntax matroska_simpletag[] = {
397
    { MATROSKA_ID_TAGNAME,            EBML_UTF8, 0, offsetof(MatroskaTag,name) },
398
    { MATROSKA_ID_TAGSTRING,          EBML_UTF8, 0, offsetof(MatroskaTag,string) },
399
    { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag,sub), {.n=matroska_simpletag} },
400
    { MATROSKA_ID_TAGLANG,            EBML_NONE },
401
    { MATROSKA_ID_TAGDEFAULT,         EBML_NONE },
402
    { 0 }
403
};
404

    
405
static EbmlSyntax matroska_tag[] = {
406
    { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), 0, {.n=matroska_simpletag} },
407
    { MATROSKA_ID_TAGTARGETS,         EBML_NONE },
408
    { 0 }
409
};
410

    
411
static EbmlSyntax matroska_tags[] = {
412
    { MATROSKA_ID_TAG,                EBML_NEST, 0, offsetof(MatroskaDemuxContext,tags), {.n=matroska_tag} },
413
    { 0 }
414
};
415

    
416
static EbmlSyntax matroska_seekhead_entry[] = {
417
    { MATROSKA_ID_SEEKID,             EBML_UINT, 0, offsetof(MatroskaSeekhead,id) },
418
    { MATROSKA_ID_SEEKPOSITION,       EBML_UINT, 0, offsetof(MatroskaSeekhead,pos), {.u=-1} },
419
    { 0 }
420
};
421

    
422
static EbmlSyntax matroska_seekhead[] = {
423
    { MATROSKA_ID_SEEKENTRY,          EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext,seekhead), {.n=matroska_seekhead_entry} },
424
    { 0 }
425
};
426

    
427
static EbmlSyntax matroska_segment[] = {
428
    { MATROSKA_ID_INFO,           EBML_NEST, 0, 0, {.n=matroska_info       } },
429
    { MATROSKA_ID_TRACKS,         EBML_NEST, 0, 0, {.n=matroska_tracks     } },
430
    { MATROSKA_ID_ATTACHMENTS,    EBML_NEST, 0, 0, {.n=matroska_attachments} },
431
    { MATROSKA_ID_CHAPTERS,       EBML_NEST, 0, 0, {.n=matroska_chapters   } },
432
    { MATROSKA_ID_CUES,           EBML_NEST, 0, 0, {.n=matroska_index      } },
433
    { MATROSKA_ID_TAGS,           EBML_NEST, 0, 0, {.n=matroska_tags       } },
434
    { MATROSKA_ID_SEEKHEAD,       EBML_NEST, 0, 0, {.n=matroska_seekhead   } },
435
    { MATROSKA_ID_CLUSTER,        EBML_STOP, 0, offsetof(MatroskaDemuxContext,has_cluster_id) },
436
    { 0 }
437
};
438

    
439
static EbmlSyntax matroska_segments[] = {
440
    { MATROSKA_ID_SEGMENT,        EBML_NEST, 0, 0, {.n=matroska_segment    } },
441
    { 0 }
442
};
443

    
444
static EbmlSyntax matroska_blockgroup[] = {
445
    { MATROSKA_ID_BLOCK,          EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
446
    { MATROSKA_ID_SIMPLEBLOCK,    EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
447
    { MATROSKA_ID_BLOCKDURATION,  EBML_UINT, 0, offsetof(MatroskaBlock,duration), {.u=AV_NOPTS_VALUE} },
448
    { MATROSKA_ID_BLOCKREFERENCE, EBML_UINT, 0, offsetof(MatroskaBlock,reference) },
449
    { 0 }
450
};
451

    
452
static EbmlSyntax matroska_cluster[] = {
453
    { MATROSKA_ID_CLUSTERTIMECODE,EBML_UINT,0, offsetof(MatroskaCluster,timecode) },
454
    { MATROSKA_ID_BLOCKGROUP,     EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
455
    { MATROSKA_ID_SIMPLEBLOCK,    EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
456
    { MATROSKA_ID_CLUSTERPOSITION,EBML_NONE },
457
    { MATROSKA_ID_CLUSTERPREVSIZE,EBML_NONE },
458
    { 0 }
459
};
460

    
461
static EbmlSyntax matroska_clusters[] = {
462
    { MATROSKA_ID_CLUSTER,        EBML_NEST, 0, 0, {.n=matroska_cluster} },
463
    { MATROSKA_ID_INFO,           EBML_NONE },
464
    { MATROSKA_ID_CUES,           EBML_NONE },
465
    { MATROSKA_ID_TAGS,           EBML_NONE },
466
    { MATROSKA_ID_SEEKHEAD,       EBML_NONE },
467
    { 0 }
468
};
469

    
470
#define SIZE_OFF(x) sizeof(((AVFormatContext*)0)->x),offsetof(AVFormatContext,x)
471
const struct {
472
    const char name[16];
473
    int   size;
474
    int   offset;
475
} metadata[] = {
476
    { "TITLE",           SIZE_OFF(title)      },
477
    { "ARTIST",          SIZE_OFF(author)     },
478
    { "WRITTEN_BY",      SIZE_OFF(author)     },
479
    { "LEAD_PERFORMER",  SIZE_OFF(author)     },
480
    { "COPYRIGHT",       SIZE_OFF(copyright)  },
481
    { "COMMENT",         SIZE_OFF(comment)    },
482
    { "ALBUM",           SIZE_OFF(album)      },
483
    { "DATE_WRITTEN",    SIZE_OFF(year)       },
484
    { "DATE_RELEASED",   SIZE_OFF(year)       },
485
    { "PART_NUMBER",     SIZE_OFF(track)      },
486
    { "GENRE",           SIZE_OFF(genre)      },
487
};
488

    
489
/*
490
 * Return: Whether we reached the end of a level in the hierarchy or not.
491
 */
492
static int ebml_level_end(MatroskaDemuxContext *matroska)
493
{
494
    ByteIOContext *pb = matroska->ctx->pb;
495
    offset_t pos = url_ftell(pb);
496

    
497
    if (matroska->num_levels > 0) {
498
        MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
499
        if (pos - level->start >= level->length) {
500
            matroska->num_levels--;
501
            return 1;
502
        }
503
    }
504
    return 0;
505
}
506

    
507
/*
508
 * Read: an "EBML number", which is defined as a variable-length
509
 * array of bytes. The first byte indicates the length by giving a
510
 * number of 0-bits followed by a one. The position of the first
511
 * "one" bit inside the first byte indicates the length of this
512
 * number.
513
 * Returns: number of bytes read, < 0 on error
514
 */
515
static int ebml_read_num(MatroskaDemuxContext *matroska, ByteIOContext *pb,
516
                         int max_size, uint64_t *number)
517
{
518
    int len_mask = 0x80, read = 1, n = 1;
519
    int64_t total = 0;
520

    
521
    /* The first byte tells us the length in bytes - get_byte() can normally
522
     * return 0, but since that's not a valid first ebmlID byte, we can
523
     * use it safely here to catch EOS. */
524
    if (!(total = get_byte(pb))) {
525
        /* we might encounter EOS here */
526
        if (!url_feof(pb)) {
527
            offset_t pos = url_ftell(pb);
528
            av_log(matroska->ctx, AV_LOG_ERROR,
529
                   "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
530
                   pos, pos);
531
        }
532
        return AVERROR(EIO); /* EOS or actual I/O error */
533
    }
534

    
535
    /* get the length of the EBML number */
536
    while (read <= max_size && !(total & len_mask)) {
537
        read++;
538
        len_mask >>= 1;
539
    }
540
    if (read > max_size) {
541
        offset_t pos = url_ftell(pb) - 1;
542
        av_log(matroska->ctx, AV_LOG_ERROR,
543
               "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
544
               (uint8_t) total, pos, pos);
545
        return AVERROR_INVALIDDATA;
546
    }
547

    
548
    /* read out length */
549
    total &= ~len_mask;
550
    while (n++ < read)
551
        total = (total << 8) | get_byte(pb);
552

    
553
    *number = total;
554

    
555
    return read;
556
}
557

    
558
/*
559
 * Read the next element as an unsigned int.
560
 * 0 is success, < 0 is failure.
561
 */
562
static int ebml_read_uint(ByteIOContext *pb, int size, uint64_t *num)
563
{
564
    int n = 0;
565

    
566
    if (size < 1 || size > 8)
567
        return AVERROR_INVALIDDATA;
568

    
569
    /* big-endian ordering; build up number */
570
    *num = 0;
571
    while (n++ < size)
572
        *num = (*num << 8) | get_byte(pb);
573

    
574
    return 0;
575
}
576

    
577
/*
578
 * Read the next element as a float.
579
 * 0 is success, < 0 is failure.
580
 */
581
static int ebml_read_float(ByteIOContext *pb, int size, double *num)
582
{
583
    if (size == 4) {
584
        *num= av_int2flt(get_be32(pb));
585
    } else if(size==8){
586
        *num= av_int2dbl(get_be64(pb));
587
    } else
588
        return AVERROR_INVALIDDATA;
589

    
590
    return 0;
591
}
592

    
593
/*
594
 * Read the next element as an ASCII string.
595
 * 0 is success, < 0 is failure.
596
 */
597
static int ebml_read_ascii(ByteIOContext *pb, int size, char **str)
598
{
599
    av_free(*str);
600
    /* EBML strings are usually not 0-terminated, so we allocate one
601
     * byte more, read the string and NULL-terminate it ourselves. */
602
    if (!(*str = av_malloc(size + 1)))
603
        return AVERROR(ENOMEM);
604
    if (get_buffer(pb, (uint8_t *) *str, size) != size) {
605
        av_free(*str);
606
        return AVERROR(EIO);
607
    }
608
    (*str)[size] = '\0';
609

    
610
    return 0;
611
}
612

    
613
/*
614
 * Read the next element as binary data.
615
 * 0 is success, < 0 is failure.
616
 */
617
static int ebml_read_binary(ByteIOContext *pb, int length, EbmlBin *bin)
618
{
619
    av_free(bin->data);
620
    if (!(bin->data = av_malloc(length)))
621
        return AVERROR(ENOMEM);
622

    
623
    bin->size = length;
624
    bin->pos  = url_ftell(pb);
625
    if (get_buffer(pb, bin->data, length) != length)
626
        return AVERROR(EIO);
627

    
628
    return 0;
629
}
630

    
631
/*
632
 * Read the next element, but only the header. The contents
633
 * are supposed to be sub-elements which can be read separately.
634
 * 0 is success, < 0 is failure.
635
 */
636
static int ebml_read_master(MatroskaDemuxContext *matroska, int length)
637
{
638
    ByteIOContext *pb = matroska->ctx->pb;
639
    MatroskaLevel *level;
640

    
641
    if (matroska->num_levels >= EBML_MAX_DEPTH) {
642
        av_log(matroska->ctx, AV_LOG_ERROR,
643
               "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
644
        return AVERROR(ENOSYS);
645
    }
646

    
647
    level = &matroska->levels[matroska->num_levels++];
648
    level->start = url_ftell(pb);
649
    level->length = length;
650

    
651
    return 0;
652
}
653

    
654
/*
655
 * Read signed/unsigned "EBML" numbers.
656
 * Return: number of bytes processed, < 0 on error
657
 */
658
static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
659
                                 uint8_t *data, uint32_t size, uint64_t *num)
660
{
661
    ByteIOContext pb;
662
    init_put_byte(&pb, data, size, 0, NULL, NULL, NULL, NULL);
663
    return ebml_read_num(matroska, &pb, 8, num);
664
}
665

    
666
/*
667
 * Same as above, but signed.
668
 */
669
static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
670
                                 uint8_t *data, uint32_t size, int64_t *num)
671
{
672
    uint64_t unum;
673
    int res;
674

    
675
    /* read as unsigned number first */
676
    if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
677
        return res;
678

    
679
    /* make signed (weird way) */
680
    *num = unum - ((1LL << (7*res - 1)) - 1);
681

    
682
    return res;
683
}
684

    
685
static int ebml_parse_elem(MatroskaDemuxContext *matroska,
686
                           EbmlSyntax *syntax, void *data);
687

    
688
static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
689
                         uint32_t id, void *data)
690
{
691
    int i;
692
    for (i=0; syntax[i].id; i++)
693
        if (id == syntax[i].id)
694
            break;
695
    if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32)
696
        av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
697
    return ebml_parse_elem(matroska, &syntax[i], data);
698
}
699

    
700
static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
701
                      void *data)
702
{
703
    uint64_t id;
704
    int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
705
    id |= 1 << 7*res;
706
    return res < 0 ? res : ebml_parse_id(matroska, syntax, id, data);
707
}
708

    
709
static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
710
                           void *data)
711
{
712
    int i, res = 0;
713

    
714
    for (i=0; syntax[i].id; i++)
715
        switch (syntax[i].type) {
716
        case EBML_UINT:
717
            *(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
718
            break;
719
        case EBML_FLOAT:
720
            *(double   *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
721
            break;
722
        case EBML_STR:
723
        case EBML_UTF8:
724
            *(char    **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
725
            break;
726
        }
727

    
728
    while (!res && !ebml_level_end(matroska))
729
        res = ebml_parse(matroska, syntax, data);
730

    
731
    return res;
732
}
733

    
734
static int ebml_parse_elem(MatroskaDemuxContext *matroska,
735
                           EbmlSyntax *syntax, void *data)
736
{
737
    ByteIOContext *pb = matroska->ctx->pb;
738
    uint32_t id = syntax->id;
739
    uint64_t length;
740
    int res;
741

    
742
    data = (char *)data + syntax->data_offset;
743
    if (syntax->list_elem_size) {
744
        EbmlList *list = data;
745
        list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
746
        data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
747
        memset(data, 0, syntax->list_elem_size);
748
        list->nb_elem++;
749
    }
750

    
751
    if (syntax->type != EBML_PASS && syntax->type != EBML_STOP)
752
        if ((res = ebml_read_num(matroska, pb, 8, &length)) < 0)
753
            return res;
754

    
755
    switch (syntax->type) {
756
    case EBML_UINT:  res = ebml_read_uint  (pb, length, data);  break;
757
    case EBML_FLOAT: res = ebml_read_float (pb, length, data);  break;
758
    case EBML_STR:
759
    case EBML_UTF8:  res = ebml_read_ascii (pb, length, data);  break;
760
    case EBML_BIN:   res = ebml_read_binary(pb, length, data);  break;
761
    case EBML_NEST:  if ((res=ebml_read_master(matroska, length)) < 0)
762
                         return res;
763
                     if (id == MATROSKA_ID_SEGMENT)
764
                         matroska->segment_start = url_ftell(matroska->ctx->pb);
765
                     return ebml_parse_nest(matroska, syntax->def.n, data);
766
    case EBML_PASS:  return ebml_parse_id(matroska, syntax->def.n, id, data);
767
    case EBML_STOP:  *(int *)data = 1;      return 1;
768
    default:         return url_fseek(pb,length,SEEK_CUR)<0 ? AVERROR(EIO) : 0;
769
    }
770
    if (res == AVERROR_INVALIDDATA)
771
        av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
772
    else if (res == AVERROR(EIO))
773
        av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
774
    return res;
775
}
776

    
777
static void ebml_free(EbmlSyntax *syntax, void *data)
778
{
779
    int i, j;
780
    for (i=0; syntax[i].id; i++) {
781
        void *data_off = (char *)data + syntax[i].data_offset;
782
        switch (syntax[i].type) {
783
        case EBML_STR:
784
        case EBML_UTF8:  av_freep(data_off);                      break;
785
        case EBML_BIN:   av_freep(&((EbmlBin *)data_off)->data);  break;
786
        case EBML_NEST:
787
            if (syntax[i].list_elem_size) {
788
                EbmlList *list = data_off;
789
                char *ptr = list->elem;
790
                for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
791
                    ebml_free(syntax[i].def.n, ptr);
792
                av_free(list->elem);
793
            } else
794
                ebml_free(syntax[i].def.n, data_off);
795
        default:  break;
796
        }
797
    }
798
}
799

    
800

    
801
/*
802
 * Autodetecting...
803
 */
804
static int matroska_probe(AVProbeData *p)
805
{
806
    uint64_t total = 0;
807
    int len_mask = 0x80, size = 1, n = 1;
808
    static const char probe_data[] = "matroska";
809

    
810
    /* EBML header? */
811
    if (AV_RB32(p->buf) != EBML_ID_HEADER)
812
        return 0;
813

    
814
    /* length of header */
815
    total = p->buf[4];
816
    while (size <= 8 && !(total & len_mask)) {
817
        size++;
818
        len_mask >>= 1;
819
    }
820
    if (size > 8)
821
      return 0;
822
    total &= (len_mask - 1);
823
    while (n < size)
824
        total = (total << 8) | p->buf[4 + n++];
825

    
826
    /* Does the probe data contain the whole header? */
827
    if (p->buf_size < 4 + size + total)
828
      return 0;
829

    
830
    /* The header must contain the document type 'matroska'. For now,
831
     * we don't parse the whole header but simply check for the
832
     * availability of that array of characters inside the header.
833
     * Not fully fool-proof, but good enough. */
834
    for (n = 4+size; n <= 4+size+total-(sizeof(probe_data)-1); n++)
835
        if (!memcmp(p->buf+n, probe_data, sizeof(probe_data)-1))
836
            return AVPROBE_SCORE_MAX;
837

    
838
    return 0;
839
}
840

    
841
static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
842
                                                 int num)
843
{
844
    MatroskaTrack *tracks = matroska->tracks.elem;
845
    int i;
846

    
847
    for (i=0; i < matroska->tracks.nb_elem; i++)
848
        if (tracks[i].num == num)
849
            return &tracks[i];
850

    
851
    av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
852
    return NULL;
853
}
854

    
855
static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
856
                                  MatroskaTrack *track)
857
{
858
    MatroskaTrackEncoding *encodings = track->encodings.elem;
859
    uint8_t* data = *buf;
860
    int isize = *buf_size;
861
    uint8_t* pkt_data = NULL;
862
    int pkt_size = isize;
863
    int result = 0;
864
    int olen;
865

    
866
    switch (encodings[0].compression.algo) {
867
    case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
868
        return encodings[0].compression.settings.size;
869
    case MATROSKA_TRACK_ENCODING_COMP_LZO:
870
        do {
871
            olen = pkt_size *= 3;
872
            pkt_data = av_realloc(pkt_data,
873
                                  pkt_size+LZO_OUTPUT_PADDING);
874
            result = lzo1x_decode(pkt_data, &olen, data, &isize);
875
        } while (result==LZO_OUTPUT_FULL && pkt_size<10000000);
876
        if (result)
877
            goto failed;
878
        pkt_size -= olen;
879
        break;
880
#ifdef CONFIG_ZLIB
881
    case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
882
        z_stream zstream = {0};
883
        if (inflateInit(&zstream) != Z_OK)
884
            return -1;
885
        zstream.next_in = data;
886
        zstream.avail_in = isize;
887
        do {
888
            pkt_size *= 3;
889
            pkt_data = av_realloc(pkt_data, pkt_size);
890
            zstream.avail_out = pkt_size - zstream.total_out;
891
            zstream.next_out = pkt_data + zstream.total_out;
892
            result = inflate(&zstream, Z_NO_FLUSH);
893
        } while (result==Z_OK && pkt_size<10000000);
894
        pkt_size = zstream.total_out;
895
        inflateEnd(&zstream);
896
        if (result != Z_STREAM_END)
897
            goto failed;
898
        break;
899
    }
900
#endif
901
#ifdef CONFIG_BZLIB
902
    case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
903
        bz_stream bzstream = {0};
904
        if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
905
            return -1;
906
        bzstream.next_in = data;
907
        bzstream.avail_in = isize;
908
        do {
909
            pkt_size *= 3;
910
            pkt_data = av_realloc(pkt_data, pkt_size);
911
            bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
912
            bzstream.next_out = pkt_data + bzstream.total_out_lo32;
913
            result = BZ2_bzDecompress(&bzstream);
914
        } while (result==BZ_OK && pkt_size<10000000);
915
        pkt_size = bzstream.total_out_lo32;
916
        BZ2_bzDecompressEnd(&bzstream);
917
        if (result != BZ_STREAM_END)
918
            goto failed;
919
        break;
920
    }
921
#endif
922
    default:
923
        return -1;
924
    }
925

    
926
    *buf = pkt_data;
927
    *buf_size = pkt_size;
928
    return 0;
929
 failed:
930
    av_free(pkt_data);
931
    return -1;
932
}
933

    
934
static void matroska_convert_tags(AVFormatContext *s, EbmlList *list)
935
{
936
    MatroskaTag *tags = list->elem;
937
    int i, j;
938

    
939
    for (i=0; i < list->nb_elem; i++) {
940
        for (j=0; j < ARRAY_SIZE(metadata); j++){
941
            if (!strcmp(tags[i].name, metadata[j].name)) {
942
                int *ptr = (int *)((char *)s + metadata[j].offset);
943
                if (*ptr)  continue;
944
                if (metadata[j].size > sizeof(int))
945
                    av_strlcpy((char *)ptr, tags[i].string, metadata[j].size);
946
                else
947
                    *ptr = atoi(tags[i].string);
948
            }
949
        }
950
        if (tags[i].sub.nb_elem)
951
            matroska_convert_tags(s, &tags[i].sub);
952
    }
953
}
954

    
955
static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
956
{
957
    EbmlList *seekhead_list = &matroska->seekhead;
958
    MatroskaSeekhead *seekhead = seekhead_list->elem;
959
    uint32_t level_up = matroska->level_up;
960
    offset_t before_pos = url_ftell(matroska->ctx->pb);
961
    MatroskaLevel level;
962
    int i;
963

    
964
    for (i=0; i<seekhead_list->nb_elem; i++) {
965
        offset_t offset = seekhead[i].pos + matroska->segment_start;
966

    
967
        if (seekhead[i].pos <= before_pos
968
            || seekhead[i].id == MATROSKA_ID_SEEKHEAD
969
            || seekhead[i].id == MATROSKA_ID_CLUSTER)
970
            continue;
971

    
972
        /* seek */
973
        if (url_fseek(matroska->ctx->pb, offset, SEEK_SET) != offset)
974
            continue;
975

    
976
        /* We don't want to lose our seekhead level, so we add
977
         * a dummy. This is a crude hack. */
978
        if (matroska->num_levels == EBML_MAX_DEPTH) {
979
            av_log(matroska->ctx, AV_LOG_INFO,
980
                   "Max EBML element depth (%d) reached, "
981
                   "cannot parse further.\n", EBML_MAX_DEPTH);
982
            break;
983
        }
984

    
985
        level.start = 0;
986
        level.length = (uint64_t)-1;
987
        matroska->levels[matroska->num_levels] = level;
988
        matroska->num_levels++;
989

    
990
        ebml_parse(matroska, matroska_segment, matroska);
991

    
992
        /* remove dummy level */
993
        while (matroska->num_levels) {
994
            uint64_t length = matroska->levels[--matroska->num_levels].length;
995
            if (length == (uint64_t)-1)
996
                break;
997
        }
998
    }
999

    
1000
    /* seek back */
1001
    url_fseek(matroska->ctx->pb, before_pos, SEEK_SET);
1002
    matroska->level_up = level_up;
1003
}
1004

    
1005
static int matroska_aac_profile(char *codec_id)
1006
{
1007
    static const char * const aac_profiles[] = { "MAIN", "LC", "SSR" };
1008
    int profile;
1009

    
1010
    for (profile=0; profile<ARRAY_SIZE(aac_profiles); profile++)
1011
        if (strstr(codec_id, aac_profiles[profile]))
1012
            break;
1013
    return profile + 1;
1014
}
1015

    
1016
static int matroska_aac_sri(int samplerate)
1017
{
1018
    int sri;
1019

    
1020
    for (sri=0; sri<ARRAY_SIZE(ff_mpeg4audio_sample_rates); sri++)
1021
        if (ff_mpeg4audio_sample_rates[sri] == samplerate)
1022
            break;
1023
    return sri;
1024
}
1025

    
1026
static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
1027
{
1028
    MatroskaDemuxContext *matroska = s->priv_data;
1029
    EbmlList *attachements_list = &matroska->attachments;
1030
    MatroskaAttachement *attachements;
1031
    EbmlList *chapters_list = &matroska->chapters;
1032
    MatroskaChapter *chapters;
1033
    MatroskaTrack *tracks;
1034
    EbmlList *index_list;
1035
    MatroskaIndex *index;
1036
    Ebml ebml = { 0 };
1037
    AVStream *st;
1038
    int i, j;
1039

    
1040
    matroska->ctx = s;
1041

    
1042
    /* First read the EBML header. */
1043
    if (ebml_parse(matroska, ebml_syntax, &ebml)
1044
        || ebml.version > EBML_VERSION       || ebml.max_size > sizeof(uint64_t)
1045
        || ebml.id_length > sizeof(uint32_t) || strcmp(ebml.doctype, "matroska")
1046
        || ebml.doctype_version > 2) {
1047
        av_log(matroska->ctx, AV_LOG_ERROR,
1048
               "EBML header using unsupported features\n"
1049
               "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
1050
               ebml.version, ebml.doctype, ebml.doctype_version);
1051
        return AVERROR_NOFMT;
1052
    }
1053
    ebml_free(ebml_syntax, &ebml);
1054

    
1055
    /* The next thing is a segment. */
1056
    if (ebml_parse(matroska, matroska_segments, matroska) < 0)
1057
        return -1;
1058
    matroska_execute_seekhead(matroska);
1059

    
1060
    if (matroska->duration)
1061
        matroska->ctx->duration = matroska->duration * matroska->time_scale
1062
                                  * 1000 / AV_TIME_BASE;
1063
    if (matroska->title)
1064
        strncpy(matroska->ctx->title, matroska->title,
1065
                sizeof(matroska->ctx->title)-1);
1066
    matroska_convert_tags(s, &matroska->tags);
1067

    
1068
    tracks = matroska->tracks.elem;
1069
    for (i=0; i < matroska->tracks.nb_elem; i++) {
1070
        MatroskaTrack *track = &tracks[i];
1071
        enum CodecID codec_id = CODEC_ID_NONE;
1072
        EbmlList *encodings_list = &tracks->encodings;
1073
        MatroskaTrackEncoding *encodings = encodings_list->elem;
1074
        uint8_t *extradata = NULL;
1075
        int extradata_size = 0;
1076
        int extradata_offset = 0;
1077

    
1078
        /* Apply some sanity checks. */
1079
        if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1080
            track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1081
            track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1082
            av_log(matroska->ctx, AV_LOG_INFO,
1083
                   "Unknown or unsupported track type %"PRIu64"\n",
1084
                   track->type);
1085
            continue;
1086
        }
1087
        if (track->codec_id == NULL)
1088
            continue;
1089

    
1090
        if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1091
            if (!track->default_duration)
1092
                track->default_duration = 1000000000/track->video.frame_rate;
1093
            if (!track->video.display_width)
1094
                track->video.display_width = track->video.pixel_width;
1095
            if (!track->video.display_height)
1096
                track->video.display_height = track->video.pixel_height;
1097
        } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1098
            if (!track->audio.out_samplerate)
1099
                track->audio.out_samplerate = track->audio.samplerate;
1100
        }
1101
        if (encodings_list->nb_elem > 1) {
1102
            av_log(matroska->ctx, AV_LOG_ERROR,
1103
                   "Multiple combined encodings no supported");
1104
        } else if (encodings_list->nb_elem == 1) {
1105
            if (encodings[0].type ||
1106
                (encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
1107
#ifdef CONFIG_ZLIB
1108
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1109
#endif
1110
#ifdef CONFIG_BZLIB
1111
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1112
#endif
1113
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
1114
                encodings[0].scope = 0;
1115
                av_log(matroska->ctx, AV_LOG_ERROR,
1116
                       "Unsupported encoding type");
1117
            } else if (track->codec_priv.size && encodings[0].scope&2) {
1118
                uint8_t *codec_priv = track->codec_priv.data;
1119
                int offset = matroska_decode_buffer(&track->codec_priv.data,
1120
                                                    &track->codec_priv.size,
1121
                                                    track);
1122
                if (offset < 0) {
1123
                    track->codec_priv.data = NULL;
1124
                    track->codec_priv.size = 0;
1125
                    av_log(matroska->ctx, AV_LOG_ERROR,
1126
                           "Failed to decode codec private data\n");
1127
                } else if (offset > 0) {
1128
                    track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
1129
                    memcpy(track->codec_priv.data,
1130
                           encodings[0].compression.settings.data, offset);
1131
                    memcpy(track->codec_priv.data+offset, codec_priv,
1132
                           track->codec_priv.size);
1133
                    track->codec_priv.size += offset;
1134
                }
1135
                if (codec_priv != track->codec_priv.data)
1136
                    av_free(codec_priv);
1137
            }
1138
        }
1139

    
1140
        for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
1141
            if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1142
                        strlen(ff_mkv_codec_tags[j].str))){
1143
                codec_id= ff_mkv_codec_tags[j].id;
1144
                break;
1145
            }
1146
        }
1147

    
1148
        st = track->stream = av_new_stream(s, 0);
1149
        if (st == NULL)
1150
            return AVERROR(ENOMEM);
1151

    
1152
        if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")
1153
            && track->codec_priv.size >= 40
1154
            && track->codec_priv.data != NULL) {
1155
            track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
1156
            codec_id = codec_get_id(codec_bmp_tags, track->video.fourcc);
1157
        } else if (!strcmp(track->codec_id, "A_MS/ACM")
1158
                   && track->codec_priv.size >= 18
1159
                   && track->codec_priv.data != NULL) {
1160
            uint16_t tag = AV_RL16(track->codec_priv.data);
1161
            codec_id = codec_get_id(codec_wav_tags, tag);
1162
        } else if (!strcmp(track->codec_id, "V_QUICKTIME")
1163
                   && (track->codec_priv.size >= 86)
1164
                   && (track->codec_priv.data != NULL)) {
1165
            track->video.fourcc = AV_RL32(track->codec_priv.data);
1166
            codec_id=codec_get_id(codec_movvideo_tags, track->video.fourcc);
1167
        } else if (codec_id == CODEC_ID_PCM_S16BE) {
1168
            switch (track->audio.bitdepth) {
1169
            case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1170
            case 24:  codec_id = CODEC_ID_PCM_S24BE;  break;
1171
            case 32:  codec_id = CODEC_ID_PCM_S32BE;  break;
1172
            }
1173
        } else if (codec_id == CODEC_ID_PCM_S16LE) {
1174
            switch (track->audio.bitdepth) {
1175
            case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1176
            case 24:  codec_id = CODEC_ID_PCM_S24LE;  break;
1177
            case 32:  codec_id = CODEC_ID_PCM_S32LE;  break;
1178
            }
1179
        } else if (codec_id==CODEC_ID_PCM_F32LE && track->audio.bitdepth==64) {
1180
            codec_id = CODEC_ID_PCM_F64LE;
1181
        } else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
1182
            int profile = matroska_aac_profile(track->codec_id);
1183
            int sri = matroska_aac_sri(track->audio.samplerate);
1184
            extradata = av_malloc(5);
1185
            if (extradata == NULL)
1186
                return AVERROR(ENOMEM);
1187
            extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
1188
            extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
1189
            if (strstr(track->codec_id, "SBR")) {
1190
                sri = matroska_aac_sri(track->audio.out_samplerate);
1191
                extradata[2] = 0x56;
1192
                extradata[3] = 0xE5;
1193
                extradata[4] = 0x80 | (sri<<3);
1194
                extradata_size = 5;
1195
            } else
1196
                extradata_size = 2;
1197
        } else if (codec_id == CODEC_ID_TTA) {
1198
            ByteIOContext b;
1199
            extradata_size = 30;
1200
            extradata = av_mallocz(extradata_size);
1201
            if (extradata == NULL)
1202
                return AVERROR(ENOMEM);
1203
            init_put_byte(&b, extradata, extradata_size, 1,
1204
                          NULL, NULL, NULL, NULL);
1205
            put_buffer(&b, "TTA1", 4);
1206
            put_le16(&b, 1);
1207
            put_le16(&b, track->audio.channels);
1208
            put_le16(&b, track->audio.bitdepth);
1209
            put_le32(&b, track->audio.out_samplerate);
1210
            put_le32(&b, matroska->ctx->duration * track->audio.out_samplerate);
1211
        } else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
1212
                   codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
1213
            extradata_offset = 26;
1214
            track->codec_priv.size -= extradata_offset;
1215
        } else if (codec_id == CODEC_ID_RA_144) {
1216
            track->audio.out_samplerate = 8000;
1217
            track->audio.channels = 1;
1218
        } else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
1219
                   codec_id == CODEC_ID_ATRAC3) {
1220
            ByteIOContext b;
1221

    
1222
            init_put_byte(&b, track->codec_priv.data,track->codec_priv.size,
1223
                          0, NULL, NULL, NULL, NULL);
1224
            url_fskip(&b, 24);
1225
            track->audio.coded_framesize = get_be32(&b);
1226
            url_fskip(&b, 12);
1227
            track->audio.sub_packet_h    = get_be16(&b);
1228
            track->audio.frame_size      = get_be16(&b);
1229
            track->audio.sub_packet_size = get_be16(&b);
1230
            track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
1231
            if (codec_id == CODEC_ID_RA_288) {
1232
                st->codec->block_align = track->audio.coded_framesize;
1233
                track->codec_priv.size = 0;
1234
            } else {
1235
                st->codec->block_align = track->audio.sub_packet_size;
1236
                extradata_offset = 78;
1237
                track->codec_priv.size -= extradata_offset;
1238
            }
1239
        }
1240

    
1241
        if (codec_id == CODEC_ID_NONE)
1242
            av_log(matroska->ctx, AV_LOG_INFO,
1243
                   "Unknown/unsupported CodecID %s.\n", track->codec_id);
1244

    
1245
        av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
1246

    
1247
        st->codec->codec_id = codec_id;
1248
        st->start_time = 0;
1249
        if (strcmp(track->language, "und"))
1250
            av_strlcpy(st->language, track->language, 4);
1251

    
1252
        if (track->flag_default)
1253
            st->disposition |= AV_DISPOSITION_DEFAULT;
1254

    
1255
        if (track->default_duration)
1256
            av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
1257
                      track->default_duration, 1000000000, 30000);
1258

    
1259
        if(extradata){
1260
            st->codec->extradata = extradata;
1261
            st->codec->extradata_size = extradata_size;
1262
        } else if(track->codec_priv.data && track->codec_priv.size > 0){
1263
            st->codec->extradata = av_malloc(track->codec_priv.size);
1264
            if(st->codec->extradata == NULL)
1265
                return AVERROR(ENOMEM);
1266
            st->codec->extradata_size = track->codec_priv.size;
1267
            memcpy(st->codec->extradata,
1268
                   track->codec_priv.data + extradata_offset,
1269
                   track->codec_priv.size);
1270
        }
1271

    
1272
        if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1273
            st->codec->codec_type = CODEC_TYPE_VIDEO;
1274
            st->codec->codec_tag  = track->video.fourcc;
1275
            st->codec->width  = track->video.pixel_width;
1276
            st->codec->height = track->video.pixel_height;
1277
            av_reduce(&st->sample_aspect_ratio.num,
1278
                      &st->sample_aspect_ratio.den,
1279
                      st->codec->height * track->video.display_width,
1280
                      st->codec-> width * track->video.display_height,
1281
                      255);
1282
            st->need_parsing = AVSTREAM_PARSE_HEADERS;
1283
        } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1284
            st->codec->codec_type = CODEC_TYPE_AUDIO;
1285
            st->codec->sample_rate = track->audio.out_samplerate;
1286
            st->codec->channels = track->audio.channels;
1287
        } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1288
            st->codec->codec_type = CODEC_TYPE_SUBTITLE;
1289
        }
1290
    }
1291

    
1292
    attachements = attachements_list->elem;
1293
    for (j=0; j<attachements_list->nb_elem; j++) {
1294
        if (!(attachements[j].filename && attachements[j].mime &&
1295
              attachements[j].bin.data && attachements[j].bin.size > 0)) {
1296
            av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
1297
        } else {
1298
            AVStream *st = av_new_stream(s, 0);
1299
            if (st == NULL)
1300
                break;
1301
            st->filename          = av_strdup(attachements[j].filename);
1302
            st->codec->codec_id = CODEC_ID_NONE;
1303
            st->codec->codec_type = CODEC_TYPE_ATTACHMENT;
1304
            st->codec->extradata  = av_malloc(attachements[j].bin.size);
1305
            if(st->codec->extradata == NULL)
1306
                break;
1307
            st->codec->extradata_size = attachements[j].bin.size;
1308
            memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
1309

    
1310
            for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
1311
                if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
1312
                             strlen(ff_mkv_mime_tags[i].str))) {
1313
                    st->codec->codec_id = ff_mkv_mime_tags[i].id;
1314
                    break;
1315
                }
1316
            }
1317
        }
1318
    }
1319

    
1320
    chapters = chapters_list->elem;
1321
    for (i=0; i<chapters_list->nb_elem; i++)
1322
        if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid)
1323
            ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
1324
                           chapters[i].start, chapters[i].end,
1325
                           chapters[i].title);
1326

    
1327
    index_list = &matroska->index;
1328
    index = index_list->elem;
1329
    for (i=0; i<index_list->nb_elem; i++) {
1330
        EbmlList *pos_list = &index[i].pos;
1331
        MatroskaIndexPos *pos = pos_list->elem;
1332
        for (j=0; j<pos_list->nb_elem; j++) {
1333
            MatroskaTrack *track = matroska_find_track_by_num(matroska,
1334
                                                              pos[j].track);
1335
            if (track && track->stream)
1336
                av_add_index_entry(track->stream,
1337
                                   pos[j].pos + matroska->segment_start,
1338
                                   index[i].time*matroska->time_scale/AV_TIME_BASE,
1339
                                   0, 0, AVINDEX_KEYFRAME);
1340
        }
1341
    }
1342

    
1343
    return 0;
1344
}
1345

    
1346
/*
1347
 * Put one packet in an application-supplied AVPacket struct.
1348
 * Returns 0 on success or -1 on failure.
1349
 */
1350
static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
1351
                                   AVPacket *pkt)
1352
{
1353
    if (matroska->num_packets > 0) {
1354
        memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
1355
        av_free(matroska->packets[0]);
1356
        if (matroska->num_packets > 1) {
1357
            memmove(&matroska->packets[0], &matroska->packets[1],
1358
                    (matroska->num_packets - 1) * sizeof(AVPacket *));
1359
            matroska->packets =
1360
                av_realloc(matroska->packets, (matroska->num_packets - 1) *
1361
                           sizeof(AVPacket *));
1362
        } else {
1363
            av_freep(&matroska->packets);
1364
        }
1365
        matroska->num_packets--;
1366
        return 0;
1367
    }
1368

    
1369
    return -1;
1370
}
1371

    
1372
/*
1373
 * Free all packets in our internal queue.
1374
 */
1375
static void matroska_clear_queue(MatroskaDemuxContext *matroska)
1376
{
1377
    if (matroska->packets) {
1378
        int n;
1379
        for (n = 0; n < matroska->num_packets; n++) {
1380
            av_free_packet(matroska->packets[n]);
1381
            av_free(matroska->packets[n]);
1382
        }
1383
        av_freep(&matroska->packets);
1384
        matroska->num_packets = 0;
1385
    }
1386
}
1387

    
1388
static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
1389
                                int size, int64_t pos, uint64_t cluster_time,
1390
                                uint64_t duration, int is_keyframe)
1391
{
1392
    MatroskaTrack *track;
1393
    int res = 0;
1394
    AVStream *st;
1395
    AVPacket *pkt;
1396
    int16_t block_time;
1397
    uint32_t *lace_size = NULL;
1398
    int n, flags, laces = 0;
1399
    uint64_t num;
1400

    
1401
    if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
1402
        av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
1403
        return res;
1404
    }
1405
    data += n;
1406
    size -= n;
1407

    
1408
    track = matroska_find_track_by_num(matroska, num);
1409
    if (size <= 3 || !track || !track->stream) {
1410
        av_log(matroska->ctx, AV_LOG_INFO,
1411
               "Invalid stream %"PRIu64" or size %u\n", num, size);
1412
        return res;
1413
    }
1414
    st = track->stream;
1415
    if (st->discard >= AVDISCARD_ALL)
1416
        return res;
1417
    if (duration == AV_NOPTS_VALUE)
1418
        duration = track->default_duration / matroska->time_scale;
1419

    
1420
    block_time = AV_RB16(data);
1421
    data += 2;
1422
    flags = *data++;
1423
    size -= 3;
1424
    if (is_keyframe == -1)
1425
        is_keyframe = flags & 0x80 ? PKT_FLAG_KEY : 0;
1426

    
1427
    if (matroska->skip_to_keyframe) {
1428
        if (!is_keyframe || st != matroska->skip_to_stream)
1429
            return res;
1430
        matroska->skip_to_keyframe = 0;
1431
    }
1432

    
1433
    switch ((flags & 0x06) >> 1) {
1434
        case 0x0: /* no lacing */
1435
            laces = 1;
1436
            lace_size = av_mallocz(sizeof(int));
1437
            lace_size[0] = size;
1438
            break;
1439

    
1440
        case 0x1: /* Xiph lacing */
1441
        case 0x2: /* fixed-size lacing */
1442
        case 0x3: /* EBML lacing */
1443
            assert(size>0); // size <=3 is checked before size-=3 above
1444
            laces = (*data) + 1;
1445
            data += 1;
1446
            size -= 1;
1447
            lace_size = av_mallocz(laces * sizeof(int));
1448

    
1449
            switch ((flags & 0x06) >> 1) {
1450
                case 0x1: /* Xiph lacing */ {
1451
                    uint8_t temp;
1452
                    uint32_t total = 0;
1453
                    for (n = 0; res == 0 && n < laces - 1; n++) {
1454
                        while (1) {
1455
                            if (size == 0) {
1456
                                res = -1;
1457
                                break;
1458
                            }
1459
                            temp = *data;
1460
                            lace_size[n] += temp;
1461
                            data += 1;
1462
                            size -= 1;
1463
                            if (temp != 0xff)
1464
                                break;
1465
                        }
1466
                        total += lace_size[n];
1467
                    }
1468
                    lace_size[n] = size - total;
1469
                    break;
1470
                }
1471

    
1472
                case 0x2: /* fixed-size lacing */
1473
                    for (n = 0; n < laces; n++)
1474
                        lace_size[n] = size / laces;
1475
                    break;
1476

    
1477
                case 0x3: /* EBML lacing */ {
1478
                    uint32_t total;
1479
                    n = matroska_ebmlnum_uint(matroska, data, size, &num);
1480
                    if (n < 0) {
1481
                        av_log(matroska->ctx, AV_LOG_INFO,
1482
                               "EBML block data error\n");
1483
                        break;
1484
                    }
1485
                    data += n;
1486
                    size -= n;
1487
                    total = lace_size[0] = num;
1488
                    for (n = 1; res == 0 && n < laces - 1; n++) {
1489
                        int64_t snum;
1490
                        int r;
1491
                        r = matroska_ebmlnum_sint(matroska, data, size, &snum);
1492
                        if (r < 0) {
1493
                            av_log(matroska->ctx, AV_LOG_INFO,
1494
                                   "EBML block data error\n");
1495
                            break;
1496
                        }
1497
                        data += r;
1498
                        size -= r;
1499
                        lace_size[n] = lace_size[n - 1] + snum;
1500
                        total += lace_size[n];
1501
                    }
1502
                    lace_size[n] = size - total;
1503
                    break;
1504
                }
1505
            }
1506
            break;
1507
    }
1508

    
1509
    if (res == 0) {
1510
        uint64_t timecode = AV_NOPTS_VALUE;
1511

    
1512
        if (cluster_time != (uint64_t)-1
1513
            && (block_time >= 0 || cluster_time >= -block_time))
1514
            timecode = cluster_time + block_time;
1515

    
1516
        for (n = 0; n < laces; n++) {
1517
            if (st->codec->codec_id == CODEC_ID_RA_288 ||
1518
                st->codec->codec_id == CODEC_ID_COOK ||
1519
                st->codec->codec_id == CODEC_ID_ATRAC3) {
1520
                int a = st->codec->block_align;
1521
                int sps = track->audio.sub_packet_size;
1522
                int cfs = track->audio.coded_framesize;
1523
                int h = track->audio.sub_packet_h;
1524
                int y = track->audio.sub_packet_cnt;
1525
                int w = track->audio.frame_size;
1526
                int x;
1527

    
1528
                if (!track->audio.pkt_cnt) {
1529
                    if (st->codec->codec_id == CODEC_ID_RA_288)
1530
                        for (x=0; x<h/2; x++)
1531
                            memcpy(track->audio.buf+x*2*w+y*cfs,
1532
                                   data+x*cfs, cfs);
1533
                    else
1534
                        for (x=0; x<w/sps; x++)
1535
                            memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
1536

    
1537
                    if (++track->audio.sub_packet_cnt >= h) {
1538
                        track->audio.sub_packet_cnt = 0;
1539
                        track->audio.pkt_cnt = h*w / a;
1540
                    }
1541
                }
1542
                while (track->audio.pkt_cnt) {
1543
                    pkt = av_mallocz(sizeof(AVPacket));
1544
                    av_new_packet(pkt, a);
1545
                    memcpy(pkt->data, track->audio.buf
1546
                           + a * (h*w / a - track->audio.pkt_cnt--), a);
1547
                    pkt->pos = pos;
1548
                    pkt->stream_index = st->index;
1549
                    dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1550
                }
1551
            } else {
1552
                MatroskaTrackEncoding *encodings = track->encodings.elem;
1553
                int offset = 0, pkt_size = lace_size[n];
1554
                uint8_t *pkt_data = data;
1555

    
1556
                if (encodings && encodings->scope & 1) {
1557
                    offset = matroska_decode_buffer(&pkt_data,&pkt_size, track);
1558
                    if (offset < 0)
1559
                        continue;
1560
                }
1561

    
1562
                pkt = av_mallocz(sizeof(AVPacket));
1563
                /* XXX: prevent data copy... */
1564
                if (av_new_packet(pkt, pkt_size+offset) < 0) {
1565
                    av_free(pkt);
1566
                    res = AVERROR(ENOMEM);
1567
                    n = laces-1;
1568
                    break;
1569
                }
1570
                if (offset)
1571
                    memcpy (pkt->data, encodings->compression.settings.data, offset);
1572
                memcpy (pkt->data+offset, pkt_data, pkt_size);
1573

    
1574
                if (pkt_data != data)
1575
                    av_free(pkt_data);
1576

    
1577
                if (n == 0)
1578
                    pkt->flags = is_keyframe;
1579
                pkt->stream_index = st->index;
1580

    
1581
                pkt->pts = timecode;
1582
                pkt->pos = pos;
1583
                pkt->duration = duration;
1584

    
1585
                dynarray_add(&matroska->packets, &matroska->num_packets, pkt);
1586
            }
1587

    
1588
            if (timecode != AV_NOPTS_VALUE)
1589
                timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
1590
            data += lace_size[n];
1591
        }
1592
    }
1593

    
1594
    av_free(lace_size);
1595
    return res;
1596
}
1597

    
1598
static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
1599
{
1600
    MatroskaCluster cluster = { 0 };
1601
    EbmlList *blocks_list;
1602
    MatroskaBlock *blocks;
1603
    int i, res;
1604
    if (matroska->has_cluster_id){
1605
        /* For the first cluster we parse, its ID was already read as
1606
           part of matroska_read_header(), so don't read it again */
1607
        res = ebml_parse_id(matroska, matroska_clusters,
1608
                            MATROSKA_ID_CLUSTER, &cluster);
1609
        matroska->has_cluster_id = 0;
1610
    } else
1611
        res = ebml_parse(matroska, matroska_clusters, &cluster);
1612
    blocks_list = &cluster.blocks;
1613
    blocks = blocks_list->elem;
1614
    for (i=0; i<blocks_list->nb_elem; i++)
1615
        if (blocks[i].bin.size > 0)
1616
            res=matroska_parse_block(matroska,
1617
                                     blocks[i].bin.data, blocks[i].bin.size,
1618
                                     blocks[i].bin.pos,  cluster.timecode,
1619
                                     blocks[i].duration, !blocks[i].reference);
1620
    ebml_free(matroska_cluster, &cluster);
1621
    if (res < 0)  matroska->done = 1;
1622
    return res;
1623
}
1624

    
1625
static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
1626
{
1627
    MatroskaDemuxContext *matroska = s->priv_data;
1628

    
1629
    while (matroska_deliver_packet(matroska, pkt)) {
1630
        if (matroska->done)
1631
            return AVERROR(EIO);
1632
        matroska_parse_cluster(matroska);
1633
    }
1634

    
1635
    return 0;
1636
}
1637

    
1638
static int matroska_read_seek(AVFormatContext *s, int stream_index,
1639
                              int64_t timestamp, int flags)
1640
{
1641
    MatroskaDemuxContext *matroska = s->priv_data;
1642
    AVStream *st = s->streams[stream_index];
1643
    int index;
1644

    
1645
    if (timestamp < 0)
1646
        timestamp = 0;
1647

    
1648
    index = av_index_search_timestamp(st, timestamp, flags);
1649
    if (index < 0)
1650
        return 0;
1651

    
1652
    matroska_clear_queue(matroska);
1653

    
1654
    url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
1655
    matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
1656
    matroska->skip_to_stream = st;
1657
    av_update_cur_dts(s, st, st->index_entries[index].timestamp);
1658
    return 0;
1659
}
1660

    
1661
static int matroska_read_close(AVFormatContext *s)
1662
{
1663
    MatroskaDemuxContext *matroska = s->priv_data;
1664
    MatroskaTrack *tracks = matroska->tracks.elem;
1665
    int n;
1666

    
1667
    matroska_clear_queue(matroska);
1668

    
1669
    for (n=0; n < matroska->tracks.nb_elem; n++)
1670
        if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
1671
            av_free(tracks[n].audio.buf);
1672
    ebml_free(matroska_segment, matroska);
1673

    
1674
    return 0;
1675
}
1676

    
1677
AVInputFormat matroska_demuxer = {
1678
    "matroska",
1679
    NULL_IF_CONFIG_SMALL("Matroska file format"),
1680
    sizeof(MatroskaDemuxContext),
1681
    matroska_probe,
1682
    matroska_read_header,
1683
    matroska_read_packet,
1684
    matroska_read_close,
1685
    matroska_read_seek,
1686
};