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ffmpeg / libavformat / matroskadec.c @ 4dc9e183

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/*
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 * Matroska file demuxer (no muxer yet)
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 * Copyright (c) 2003-2004 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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 * Specs available on the matroska project page:
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 * 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;
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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;
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typedef struct {
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    uint64_t algo;
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    EbmlBin  settings;
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} MatroskaTrackCompression;
95

    
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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;
110

    
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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;
126

    
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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;
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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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    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;
175

    
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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;
183

    
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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 seekhead;
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    /* num_streams is the number of streams that av_new_stream() was called
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     * for ( = that are available to the calling program). */
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    int num_streams;
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    /* cache for ID peeking */
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    uint32_t peek_id;
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    /* byte position of the segment inside the stream */
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    offset_t segment_start;
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203
    /* 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} },
230
    { 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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    { EBML_ID_VOID,                   EBML_NONE },
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    { 0 }
238
};
239

    
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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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};
244

    
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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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    { EBML_ID_VOID,                   EBML_NONE },
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    { 0 }
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};
256

    
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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_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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    { EBML_ID_VOID,                   EBML_NONE },
268
    { 0 }
269
};
270

    
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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} },
273
    { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ,EBML_FLOAT,0,offsetof(MatroskaTrackAudio,out_samplerate) },
274
    { MATROSKA_ID_AUDIOBITDEPTH,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,bitdepth) },
275
    { MATROSKA_ID_AUDIOCHANNELS,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,channels), {.u=1} },
276
    { EBML_ID_VOID,                   EBML_NONE },
277
    { 0 }
278
};
279

    
280
static EbmlSyntax matroska_track_encoding_compression[] = {
281
    { MATROSKA_ID_ENCODINGCOMPALGO,   EBML_UINT, 0, offsetof(MatroskaTrackCompression,algo), {.u=0} },
282
    { MATROSKA_ID_ENCODINGCOMPSETTINGS,EBML_BIN, 0, offsetof(MatroskaTrackCompression,settings) },
283
    { EBML_ID_VOID,                   EBML_NONE },
284
    { 0 }
285
};
286

    
287
static EbmlSyntax matroska_track_encoding[] = {
288
    { MATROSKA_ID_ENCODINGSCOPE,      EBML_UINT, 0, offsetof(MatroskaTrackEncoding,scope), {.u=1} },
289
    { MATROSKA_ID_ENCODINGTYPE,       EBML_UINT, 0, offsetof(MatroskaTrackEncoding,type), {.u=0} },
290
    { MATROSKA_ID_ENCODINGCOMPRESSION,EBML_NEST, 0, offsetof(MatroskaTrackEncoding,compression), {.n=matroska_track_encoding_compression} },
291
    { EBML_ID_VOID,                   EBML_NONE },
292
    { 0 }
293
};
294

    
295
static EbmlSyntax matroska_track_encodings[] = {
296
    { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack,encodings), {.n=matroska_track_encoding} },
297
    { EBML_ID_VOID,                   EBML_NONE },
298
    { 0 }
299
};
300

    
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static EbmlSyntax matroska_track[] = {
302
    { MATROSKA_ID_TRACKNUMBER,          EBML_UINT, 0, offsetof(MatroskaTrack,num) },
303
    { MATROSKA_ID_TRACKTYPE,            EBML_UINT, 0, offsetof(MatroskaTrack,type) },
304
    { MATROSKA_ID_CODECID,              EBML_STR,  0, offsetof(MatroskaTrack,codec_id) },
305
    { MATROSKA_ID_CODECPRIVATE,         EBML_BIN,  0, offsetof(MatroskaTrack,codec_priv) },
306
    { MATROSKA_ID_TRACKLANGUAGE,        EBML_UTF8, 0, offsetof(MatroskaTrack,language), {.s="eng"} },
307
    { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack,default_duration) },
308
    { MATROSKA_ID_TRACKTIMECODESCALE,   EBML_FLOAT,0, offsetof(MatroskaTrack,time_scale), {.f=1.0} },
309
    { MATROSKA_ID_TRACKFLAGDEFAULT,     EBML_UINT, 0, offsetof(MatroskaTrack,flag_default), {.u=1} },
310
    { MATROSKA_ID_TRACKVIDEO,           EBML_NEST, 0, offsetof(MatroskaTrack,video), {.n=matroska_track_video} },
311
    { MATROSKA_ID_TRACKAUDIO,           EBML_NEST, 0, offsetof(MatroskaTrack,audio), {.n=matroska_track_audio} },
312
    { MATROSKA_ID_TRACKCONTENTENCODINGS,EBML_NEST, 0, 0, {.n=matroska_track_encodings} },
313
    { MATROSKA_ID_TRACKUID,             EBML_NONE },
314
    { MATROSKA_ID_TRACKNAME,            EBML_NONE },
315
    { MATROSKA_ID_TRACKFLAGENABLED,     EBML_NONE },
316
    { MATROSKA_ID_TRACKFLAGFORCED,      EBML_NONE },
317
    { MATROSKA_ID_TRACKFLAGLACING,      EBML_NONE },
318
    { MATROSKA_ID_CODECNAME,            EBML_NONE },
319
    { MATROSKA_ID_CODECDECODEALL,       EBML_NONE },
320
    { MATROSKA_ID_CODECINFOURL,         EBML_NONE },
321
    { MATROSKA_ID_CODECDOWNLOADURL,     EBML_NONE },
322
    { MATROSKA_ID_TRACKMINCACHE,        EBML_NONE },
323
    { MATROSKA_ID_TRACKMAXCACHE,        EBML_NONE },
324
    { EBML_ID_VOID,                     EBML_NONE },
325
    { 0 }
326
};
327

    
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static EbmlSyntax matroska_tracks[] = {
329
    { MATROSKA_ID_TRACKENTRY,         EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext,tracks), {.n=matroska_track} },
330
    { EBML_ID_VOID,                   EBML_NONE },
331
    { 0 }
332
};
333

    
334
static EbmlSyntax matroska_attachment[] = {
335
    { MATROSKA_ID_FILENAME,           EBML_UTF8, 0, offsetof(MatroskaAttachement,filename) },
336
    { MATROSKA_ID_FILEMIMETYPE,       EBML_STR,  0, offsetof(MatroskaAttachement,mime) },
337
    { MATROSKA_ID_FILEDATA,           EBML_BIN,  0, offsetof(MatroskaAttachement,bin) },
338
    { MATROSKA_ID_FILEUID,            EBML_NONE },
339
    { EBML_ID_VOID,                   EBML_NONE },
340
    { 0 }
341
};
342

    
343
static EbmlSyntax matroska_attachments[] = {
344
    { MATROSKA_ID_ATTACHEDFILE,       EBML_NEST, sizeof(MatroskaAttachement), offsetof(MatroskaDemuxContext,attachments), {.n=matroska_attachment} },
345
    { EBML_ID_VOID,                   EBML_NONE },
346
    { 0 }
347
};
348

    
349
static EbmlSyntax matroska_chapter_display[] = {
350
    { MATROSKA_ID_CHAPSTRING,         EBML_UTF8, 0, offsetof(MatroskaChapter,title) },
351
    { EBML_ID_VOID,                   EBML_NONE },
352
    { 0 }
353
};
354

    
355
static EbmlSyntax matroska_chapter_entry[] = {
356
    { MATROSKA_ID_CHAPTERTIMESTART,   EBML_UINT, 0, offsetof(MatroskaChapter,start), {.u=AV_NOPTS_VALUE} },
357
    { MATROSKA_ID_CHAPTERTIMEEND,     EBML_UINT, 0, offsetof(MatroskaChapter,end), {.u=AV_NOPTS_VALUE} },
358
    { MATROSKA_ID_CHAPTERUID,         EBML_UINT, 0, offsetof(MatroskaChapter,uid) },
359
    { MATROSKA_ID_CHAPTERDISPLAY,     EBML_NEST, 0, 0, {.n=matroska_chapter_display} },
360
    { MATROSKA_ID_CHAPTERFLAGHIDDEN,  EBML_NONE },
361
    { EBML_ID_VOID,                   EBML_NONE },
362
    { 0 }
363
};
364

    
365
static EbmlSyntax matroska_chapter[] = {
366
    { MATROSKA_ID_CHAPTERATOM,        EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext,chapters), {.n=matroska_chapter_entry} },
367
    { MATROSKA_ID_EDITIONUID,         EBML_NONE },
368
    { MATROSKA_ID_EDITIONFLAGHIDDEN,  EBML_NONE },
369
    { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
370
    { EBML_ID_VOID,                   EBML_NONE },
371
    { 0 }
372
};
373

    
374
static EbmlSyntax matroska_chapters[] = {
375
    { MATROSKA_ID_EDITIONENTRY,       EBML_NEST, 0, 0, {.n=matroska_chapter} },
376
    { EBML_ID_VOID,                   EBML_NONE },
377
    { 0 }
378
};
379

    
380
static EbmlSyntax matroska_index_pos[] = {
381
    { MATROSKA_ID_CUETRACK,           EBML_UINT, 0, offsetof(MatroskaIndexPos,track) },
382
    { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos,pos)   },
383
    { EBML_ID_VOID,                   EBML_NONE },
384
    { 0 }
385
};
386

    
387
static EbmlSyntax matroska_index_entry[] = {
388
    { MATROSKA_ID_CUETIME,            EBML_UINT, 0, offsetof(MatroskaIndex,time) },
389
    { MATROSKA_ID_CUETRACKPOSITION,   EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex,pos), {.n=matroska_index_pos} },
390
    { EBML_ID_VOID,                   EBML_NONE },
391
    { 0 }
392
};
393

    
394
static EbmlSyntax matroska_index[] = {
395
    { MATROSKA_ID_POINTENTRY,         EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext,index), {.n=matroska_index_entry} },
396
    { EBML_ID_VOID,                   EBML_NONE },
397
    { 0 }
398
};
399

    
400
static EbmlSyntax matroska_tags[] = {
401
    { EBML_ID_VOID,                   EBML_NONE },
402
    { 0 }
403
};
404

    
405
static EbmlSyntax matroska_seekhead_entry[] = {
406
    { MATROSKA_ID_SEEKID,             EBML_UINT, 0, offsetof(MatroskaSeekhead,id) },
407
    { MATROSKA_ID_SEEKPOSITION,       EBML_UINT, 0, offsetof(MatroskaSeekhead,pos), {.u=-1} },
408
    { EBML_ID_VOID,                   EBML_NONE },
409
    { 0 }
410
};
411

    
412
static EbmlSyntax matroska_seekhead[] = {
413
    { MATROSKA_ID_SEEKENTRY,          EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext,seekhead), {.n=matroska_seekhead_entry} },
414
    { EBML_ID_VOID,                   EBML_NONE },
415
    { 0 }
416
};
417

    
418
static EbmlSyntax matroska_segment[] = {
419
    { MATROSKA_ID_INFO,           EBML_NEST, 0, 0, {.n=matroska_info       } },
420
    { MATROSKA_ID_TRACKS,         EBML_NEST, 0, 0, {.n=matroska_tracks     } },
421
    { MATROSKA_ID_ATTACHMENTS,    EBML_NEST, 0, 0, {.n=matroska_attachments} },
422
    { MATROSKA_ID_CHAPTERS,       EBML_NEST, 0, 0, {.n=matroska_chapters   } },
423
    { MATROSKA_ID_CUES,           EBML_NEST, 0, 0, {.n=matroska_index      } },
424
    { MATROSKA_ID_TAGS,           EBML_NEST, 0, 0, {.n=matroska_tags       } },
425
    { MATROSKA_ID_SEEKHEAD,       EBML_NEST, 0, 0, {.n=matroska_seekhead   } },
426
    { MATROSKA_ID_CLUSTER,        EBML_STOP, 0, offsetof(MatroskaDemuxContext,has_cluster_id) },
427
    { EBML_ID_VOID,               EBML_NONE },
428
    { 0 }
429
};
430

    
431
static EbmlSyntax matroska_segments[] = {
432
    { MATROSKA_ID_SEGMENT,        EBML_NEST, 0, 0, {.n=matroska_segment    } },
433
    { 0 }
434
};
435

    
436
static EbmlSyntax matroska_blockgroup[] = {
437
    { MATROSKA_ID_BLOCK,          EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
438
    { MATROSKA_ID_SIMPLEBLOCK,    EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
439
    { MATROSKA_ID_BLOCKDURATION,  EBML_UINT, 0, offsetof(MatroskaBlock,duration), {.u=AV_NOPTS_VALUE} },
440
    { MATROSKA_ID_BLOCKREFERENCE, EBML_UINT, 0, offsetof(MatroskaBlock,reference) },
441
    { EBML_ID_VOID,               EBML_NONE },
442
    { 0 }
443
};
444

    
445
static EbmlSyntax matroska_cluster[] = {
446
    { MATROSKA_ID_CLUSTERTIMECODE,EBML_UINT,0, offsetof(MatroskaCluster,timecode) },
447
    { MATROSKA_ID_BLOCKGROUP,     EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
448
    { MATROSKA_ID_SIMPLEBLOCK,    EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
449
    { EBML_ID_VOID,               EBML_NONE },
450
    { 0 }
451
};
452

    
453
static EbmlSyntax matroska_clusters[] = {
454
    { MATROSKA_ID_CLUSTER,        EBML_NEST, 0, 0, {.n=matroska_cluster} },
455
    { 0 }
456
};
457

    
458
/*
459
 * Return: the amount of levels in the hierarchy that the
460
 * current element lies higher than the previous one.
461
 * The opposite isn't done - that's auto-done using master
462
 * element reading.
463
 */
464
static int
465
ebml_read_element_level_up (MatroskaDemuxContext *matroska)
466
{
467
    ByteIOContext *pb = matroska->ctx->pb;
468
    offset_t pos = url_ftell(pb);
469
    int num = 0;
470

    
471
    while (matroska->num_levels > 0) {
472
        MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
473

    
474
        if (pos >= level->start + level->length) {
475
            matroska->num_levels--;
476
            num++;
477
        } else {
478
            break;
479
        }
480
    }
481

    
482
    return num;
483
}
484

    
485
/*
486
 * Read: an "EBML number", which is defined as a variable-length
487
 * array of bytes. The first byte indicates the length by giving a
488
 * number of 0-bits followed by a one. The position of the first
489
 * "one" bit inside the first byte indicates the length of this
490
 * number.
491
 * Returns: num. of bytes read. < 0 on error.
492
 */
493
static int
494
ebml_read_num (MatroskaDemuxContext *matroska,
495
               int                   max_size,
496
               uint64_t             *number)
497
{
498
    ByteIOContext *pb = matroska->ctx->pb;
499
    int len_mask = 0x80, read = 1, n = 1;
500
    int64_t total = 0;
501

    
502
    /* the first byte tells us the length in bytes - get_byte() can normally
503
     * return 0, but since that's not a valid first ebmlID byte, we can
504
     * use it safely here to catch EOS. */
505
    if (!(total = get_byte(pb))) {
506
        /* we might encounter EOS here */
507
        if (!url_feof(pb)) {
508
            offset_t pos = url_ftell(pb);
509
            av_log(matroska->ctx, AV_LOG_ERROR,
510
                   "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
511
                   pos, pos);
512
        }
513
        return AVERROR(EIO); /* EOS or actual I/O error */
514
    }
515

    
516
    /* get the length of the EBML number */
517
    while (read <= max_size && !(total & len_mask)) {
518
        read++;
519
        len_mask >>= 1;
520
    }
521
    if (read > max_size) {
522
        offset_t pos = url_ftell(pb) - 1;
523
        av_log(matroska->ctx, AV_LOG_ERROR,
524
               "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
525
               (uint8_t) total, pos, pos);
526
        return AVERROR_INVALIDDATA;
527
    }
528

    
529
    /* read out length */
530
    total &= ~len_mask;
531
    while (n++ < read)
532
        total = (total << 8) | get_byte(pb);
533

    
534
    *number = total;
535

    
536
    return read;
537
}
538

    
539
/*
540
 * Read: the element content data ID.
541
 * Return: the number of bytes read or < 0 on error.
542
 */
543
static int
544
ebml_read_element_id (MatroskaDemuxContext *matroska,
545
                      uint32_t             *id)
546
{
547
    int read;
548
    uint64_t total;
549

    
550
    /* if we re-call this, use our cached ID */
551
    if (matroska->peek_id != 0) {
552
        *id = matroska->peek_id;
553
        return 0;
554
    }
555

    
556
    /* read out the "EBML number", include tag in ID */
557
    if ((read = ebml_read_num(matroska, 4, &total)) < 0)
558
        return read;
559
    *id = matroska->peek_id  = total | (1 << (read * 7));
560

    
561
    return read;
562
}
563

    
564
/*
565
 * Read: element content length.
566
 * Return: the number of bytes read or < 0 on error.
567
 */
568
static int
569
ebml_read_element_length (MatroskaDemuxContext *matroska,
570
                          uint64_t             *length)
571
{
572
    /* clear cache since we're now beyond that data point */
573
    matroska->peek_id = 0;
574

    
575
    /* read out the "EBML number", include tag in ID */
576
    return ebml_read_num(matroska, 8, length);
577
}
578

    
579
/*
580
 * Seek to a given offset.
581
 * 0 is success, -1 is failure.
582
 */
583
static int
584
ebml_read_seek (MatroskaDemuxContext *matroska,
585
                offset_t              offset)
586
{
587
    ByteIOContext *pb = matroska->ctx->pb;
588

    
589
    /* clear ID cache, if any */
590
    matroska->peek_id = 0;
591

    
592
    return (url_fseek(pb, offset, SEEK_SET) == offset) ? 0 : -1;
593
}
594

    
595
/*
596
 * Skip the next element.
597
 * 0 is success, -1 is failure.
598
 */
599
static int
600
ebml_read_skip (MatroskaDemuxContext *matroska)
601
{
602
    ByteIOContext *pb = matroska->ctx->pb;
603
    uint32_t id;
604
    uint64_t length;
605
    int res;
606

    
607
    if ((res = ebml_read_element_id(matroska, &id)) < 0 ||
608
        (res = ebml_read_element_length(matroska, &length)) < 0)
609
        return res;
610

    
611
    url_fskip(pb, length);
612

    
613
    return 0;
614
}
615

    
616
/*
617
 * Read the next element as an unsigned int.
618
 * 0 is success, < 0 is failure.
619
 */
620
static int
621
ebml_read_uint (MatroskaDemuxContext *matroska,
622
                uint32_t             *id,
623
                uint64_t             *num)
624
{
625
    ByteIOContext *pb = matroska->ctx->pb;
626
    int n = 0, size, res;
627
    uint64_t rlength;
628

    
629
    if ((res = ebml_read_element_id(matroska, id)) < 0 ||
630
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
631
        return res;
632
    size = rlength;
633
    if (size < 1 || size > 8) {
634
        offset_t pos = url_ftell(pb);
635
        av_log(matroska->ctx, AV_LOG_ERROR,
636
               "Invalid uint element size %d at position %"PRId64" (0x%"PRIx64")\n",
637
                size, pos, pos);
638
        return AVERROR_INVALIDDATA;
639
    }
640

    
641
    /* big-endian ordening; build up number */
642
    *num = 0;
643
    while (n++ < size)
644
        *num = (*num << 8) | get_byte(pb);
645

    
646
    return 0;
647
}
648

    
649
/*
650
 * Read the next element as a float.
651
 * 0 is success, < 0 is failure.
652
 */
653
static int
654
ebml_read_float (MatroskaDemuxContext *matroska,
655
                 uint32_t             *id,
656
                 double               *num)
657
{
658
    ByteIOContext *pb = matroska->ctx->pb;
659
    int size, res;
660
    uint64_t rlength;
661

    
662
    if ((res = ebml_read_element_id(matroska, id)) < 0 ||
663
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
664
        return res;
665
    size = rlength;
666

    
667
    if (size == 4) {
668
        *num= av_int2flt(get_be32(pb));
669
    } else if(size==8){
670
        *num= av_int2dbl(get_be64(pb));
671
    } else{
672
        offset_t pos = url_ftell(pb);
673
        av_log(matroska->ctx, AV_LOG_ERROR,
674
               "Invalid float element size %d at position %"PRIu64" (0x%"PRIx64")\n",
675
               size, pos, pos);
676
        return AVERROR_INVALIDDATA;
677
    }
678

    
679
    return 0;
680
}
681

    
682
/*
683
 * Read the next element as an ASCII string.
684
 * 0 is success, < 0 is failure.
685
 */
686
static int
687
ebml_read_ascii (MatroskaDemuxContext *matroska,
688
                 uint32_t             *id,
689
                 char                **str)
690
{
691
    ByteIOContext *pb = matroska->ctx->pb;
692
    int size, res;
693
    uint64_t rlength;
694

    
695
    if ((res = ebml_read_element_id(matroska, id)) < 0 ||
696
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
697
        return res;
698
    size = rlength;
699

    
700
    /* ebml strings are usually not 0-terminated, so we allocate one
701
     * byte more, read the string and NULL-terminate it ourselves. */
702
    if (size < 0 || !(*str = av_malloc(size + 1))) {
703
        av_log(matroska->ctx, AV_LOG_ERROR, "Memory allocation failed\n");
704
        return AVERROR(ENOMEM);
705
    }
706
    if (get_buffer(pb, (uint8_t *) *str, size) != size) {
707
        offset_t pos = url_ftell(pb);
708
        av_log(matroska->ctx, AV_LOG_ERROR,
709
               "Read error at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
710
        av_free(*str);
711
        return AVERROR(EIO);
712
    }
713
    (*str)[size] = '\0';
714

    
715
    return 0;
716
}
717

    
718
/*
719
 * Read the next element, but only the header. The contents
720
 * are supposed to be sub-elements which can be read separately.
721
 * 0 is success, < 0 is failure.
722
 */
723
static int
724
ebml_read_master (MatroskaDemuxContext *matroska,
725
                  uint32_t             *id)
726
{
727
    ByteIOContext *pb = matroska->ctx->pb;
728
    uint64_t length;
729
    MatroskaLevel *level;
730
    int res;
731

    
732
    if ((res = ebml_read_element_id(matroska, id)) < 0 ||
733
        (res = ebml_read_element_length(matroska, &length)) < 0)
734
        return res;
735

    
736
    if (matroska->num_levels >= EBML_MAX_DEPTH) {
737
        av_log(matroska->ctx, AV_LOG_ERROR,
738
               "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
739
        return AVERROR(ENOSYS);
740
    }
741

    
742
    level = &matroska->levels[matroska->num_levels++];
743
    level->start = url_ftell(pb);
744
    level->length = length;
745

    
746
    return 0;
747
}
748

    
749
/*
750
 * Read the next element as binary data.
751
 * 0 is success, < 0 is failure.
752
 */
753
static int
754
ebml_read_binary (MatroskaDemuxContext *matroska,
755
                  uint32_t             *id,
756
                  uint8_t             **binary,
757
                  int                  *size)
758
{
759
    ByteIOContext *pb = matroska->ctx->pb;
760
    uint64_t rlength;
761
    int res;
762

    
763
    if ((res = ebml_read_element_id(matroska, id)) < 0 ||
764
        (res = ebml_read_element_length(matroska, &rlength)) < 0)
765
        return res;
766
    *size = rlength;
767

    
768
    if (!(*binary = av_malloc(*size))) {
769
        av_log(matroska->ctx, AV_LOG_ERROR,
770
               "Memory allocation error\n");
771
        return AVERROR(ENOMEM);
772
    }
773

    
774
    if (get_buffer(pb, *binary, *size) != *size) {
775
        offset_t pos = url_ftell(pb);
776
        av_log(matroska->ctx, AV_LOG_ERROR,
777
               "Read error at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
778
        return AVERROR(EIO);
779
    }
780

    
781
    return 0;
782
}
783

    
784
/*
785
 * Read signed/unsigned "EBML" numbers.
786
 * Return: number of bytes processed, < 0 on error.
787
 * XXX: use ebml_read_num().
788
 */
789
static int
790
matroska_ebmlnum_uint (uint8_t  *data,
791
                       uint32_t  size,
792
                       uint64_t *num)
793
{
794
    int len_mask = 0x80, read = 1, n = 1, num_ffs = 0;
795
    uint64_t total;
796

    
797
    if (size <= 0)
798
        return AVERROR_INVALIDDATA;
799

    
800
    total = data[0];
801
    while (read <= 8 && !(total & len_mask)) {
802
        read++;
803
        len_mask >>= 1;
804
    }
805
    if (read > 8)
806
        return AVERROR_INVALIDDATA;
807

    
808
    if ((total &= (len_mask - 1)) == len_mask - 1)
809
        num_ffs++;
810
    if (size < read)
811
        return AVERROR_INVALIDDATA;
812
    while (n < read) {
813
        if (data[n] == 0xff)
814
            num_ffs++;
815
        total = (total << 8) | data[n];
816
        n++;
817
    }
818

    
819
    if (read == num_ffs)
820
        *num = (uint64_t)-1;
821
    else
822
        *num = total;
823

    
824
    return read;
825
}
826

    
827
/*
828
 * Same as above, but signed.
829
 */
830
static int
831
matroska_ebmlnum_sint (uint8_t  *data,
832
                       uint32_t  size,
833
                       int64_t  *num)
834
{
835
    uint64_t unum;
836
    int res;
837

    
838
    /* read as unsigned number first */
839
    if ((res = matroska_ebmlnum_uint(data, size, &unum)) < 0)
840
        return res;
841

    
842
    /* make signed (weird way) */
843
    if (unum == (uint64_t)-1)
844
        *num = INT64_MAX;
845
    else
846
        *num = unum - ((1LL << ((7 * res) - 1)) - 1);
847

    
848
    return res;
849
}
850

    
851

    
852
static MatroskaTrack *
853
matroska_find_track_by_num (MatroskaDemuxContext *matroska,
854
                            int                   num)
855
{
856
    MatroskaTrack *tracks = matroska->tracks.elem;
857
    int i;
858

    
859
    for (i=0; i < matroska->tracks.nb_elem; i++)
860
        if (tracks[i].num == num)
861
            return &tracks[i];
862

    
863
    av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
864
    return NULL;
865
}
866

    
867

    
868
/*
869
 * Put one packet in an application-supplied AVPacket struct.
870
 * Returns 0 on success or -1 on failure.
871
 */
872
static int
873
matroska_deliver_packet (MatroskaDemuxContext *matroska,
874
                         AVPacket             *pkt)
875
{
876
    if (matroska->num_packets > 0) {
877
        memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
878
        av_free(matroska->packets[0]);
879
        if (matroska->num_packets > 1) {
880
            memmove(&matroska->packets[0], &matroska->packets[1],
881
                    (matroska->num_packets - 1) * sizeof(AVPacket *));
882
            matroska->packets =
883
                av_realloc(matroska->packets, (matroska->num_packets - 1) *
884
                           sizeof(AVPacket *));
885
        } else {
886
            av_freep(&matroska->packets);
887
        }
888
        matroska->num_packets--;
889
        return 0;
890
    }
891

    
892
    return -1;
893
}
894

    
895
/*
896
 * Put a packet into our internal queue. Will be delivered to the
897
 * user/application during the next get_packet() call.
898
 */
899
static void
900
matroska_queue_packet (MatroskaDemuxContext *matroska,
901
                       AVPacket             *pkt)
902
{
903
    matroska->packets =
904
        av_realloc(matroska->packets, (matroska->num_packets + 1) *
905
                   sizeof(AVPacket *));
906
    matroska->packets[matroska->num_packets] = pkt;
907
    matroska->num_packets++;
908
}
909

    
910
/*
911
 * Free all packets in our internal queue.
912
 */
913
static void
914
matroska_clear_queue (MatroskaDemuxContext *matroska)
915
{
916
    if (matroska->packets) {
917
        int n;
918
        for (n = 0; n < matroska->num_packets; n++) {
919
            av_free_packet(matroska->packets[n]);
920
            av_free(matroska->packets[n]);
921
        }
922
        av_free(matroska->packets);
923
        matroska->packets = NULL;
924
        matroska->num_packets = 0;
925
    }
926
}
927

    
928

    
929
/*
930
 * Autodetecting...
931
 */
932
static int
933
matroska_probe (AVProbeData *p)
934
{
935
    uint64_t total = 0;
936
    int len_mask = 0x80, size = 1, n = 1;
937
    uint8_t probe_data[] = { 'm', 'a', 't', 'r', 'o', 's', 'k', 'a' };
938

    
939
    /* ebml header? */
940
    if (AV_RB32(p->buf) != EBML_ID_HEADER)
941
        return 0;
942

    
943
    /* length of header */
944
    total = p->buf[4];
945
    while (size <= 8 && !(total & len_mask)) {
946
        size++;
947
        len_mask >>= 1;
948
    }
949
    if (size > 8)
950
      return 0;
951
    total &= (len_mask - 1);
952
    while (n < size)
953
        total = (total << 8) | p->buf[4 + n++];
954

    
955
    /* does the probe data contain the whole header? */
956
    if (p->buf_size < 4 + size + total)
957
      return 0;
958

    
959
    /* the header must contain the document type 'matroska'. For now,
960
     * we don't parse the whole header but simply check for the
961
     * availability of that array of characters inside the header.
962
     * Not fully fool-proof, but good enough. */
963
    for (n = 4 + size; n <= 4 + size + total - sizeof(probe_data); n++)
964
        if (!memcmp (&p->buf[n], probe_data, sizeof(probe_data)))
965
            return AVPROBE_SCORE_MAX;
966

    
967
    return 0;
968
}
969

    
970
static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
971
                      void *data, uint32_t expected_id, int once);
972

    
973
static int ebml_parse_elem(MatroskaDemuxContext *matroska,
974
                           EbmlSyntax *syntax, void *data)
975
{
976
    uint32_t id = syntax->id;
977
    EbmlBin *bin;
978
    int res;
979

    
980
    data = (char *)data + syntax->data_offset;
981
    if (syntax->list_elem_size) {
982
        EbmlList *list = data;
983
        list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
984
        data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
985
        memset(data, 0, syntax->list_elem_size);
986
        list->nb_elem++;
987
    }
988
    bin = data;
989

    
990
    switch (syntax->type) {
991
    case EBML_UINT:  return ebml_read_uint (matroska, &id, data);
992
    case EBML_FLOAT: return ebml_read_float(matroska, &id, data);
993
    case EBML_STR:
994
    case EBML_UTF8:  av_free(*(char **)data);
995
                     return ebml_read_ascii(matroska, &id, data);
996
    case EBML_BIN:   av_free(bin->data);
997
                     bin->pos = url_ftell(matroska->ctx->pb);
998
                     return ebml_read_binary(matroska, &id, &bin->data,
999
                                                            &bin->size);
1000
    case EBML_NEST:  if ((res=ebml_read_master(matroska, &id)) < 0)
1001
                         return res;
1002
                     if (id == MATROSKA_ID_SEGMENT)
1003
                         matroska->segment_start = url_ftell(matroska->ctx->pb);
1004
                     return ebml_parse(matroska, syntax->def.n, data, 0, 0);
1005
    case EBML_PASS:  return ebml_parse(matroska, syntax->def.n, data, 0, 1);
1006
    case EBML_STOP:  *(int *)data = 1;      return 1;
1007
    default:         return ebml_read_skip(matroska);
1008
    }
1009
}
1010

    
1011
static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
1012
                         uint32_t id, void *data)
1013
{
1014
    int i;
1015
    for (i=0; syntax[i].id; i++)
1016
        if (id == syntax[i].id)
1017
            break;
1018
    if (!syntax[i].id)
1019
        av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
1020
    return ebml_parse_elem(matroska, &syntax[i], data);
1021
}
1022

    
1023
static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
1024
                      void *data, uint32_t expected_id, int once)
1025
{
1026
    int i, res = 0, res2;
1027
    uint32_t id = 0;
1028

    
1029
    for (i=0; syntax[i].id; i++)
1030
        switch (syntax[i].type) {
1031
        case EBML_UINT:
1032
            *(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
1033
            break;
1034
        case EBML_FLOAT:
1035
            *(double   *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
1036
            break;
1037
        case EBML_STR:
1038
        case EBML_UTF8:
1039
            *(char    **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
1040
            break;
1041
        }
1042

    
1043
    if (expected_id) {
1044
        res = ebml_read_master(matroska, &id);
1045
        if (id != expected_id)
1046
            return AVERROR_INVALIDDATA;
1047
        if (id == MATROSKA_ID_SEGMENT)
1048
            matroska->segment_start = url_ftell(matroska->ctx->pb);
1049
    }
1050

    
1051
    while (!res) {
1052
        res2 = ebml_read_element_id(matroska, &id);
1053
        if (res2 < 0)
1054
            break;
1055
        if (res2 > 0)
1056
            matroska->level_up = ebml_read_element_level_up(matroska);
1057
        if (matroska->level_up) {
1058
            matroska->level_up--;
1059
            break;
1060
        }
1061

    
1062
        res = ebml_parse_id(matroska, syntax, id, data);
1063
        if (once)
1064
            break;
1065
    }
1066

    
1067
    return res;
1068
}
1069

    
1070
static void ebml_free(EbmlSyntax *syntax, void *data)
1071
{
1072
    int i, j;
1073
    for (i=0; syntax[i].id; i++) {
1074
        void *data_off = (char *)data + syntax[i].data_offset;
1075
        switch (syntax[i].type) {
1076
        case EBML_STR:
1077
        case EBML_UTF8:  av_freep(data_off);                      break;
1078
        case EBML_BIN:   av_freep(&((EbmlBin *)data_off)->data);  break;
1079
        case EBML_NEST:
1080
            if (syntax[i].list_elem_size) {
1081
                EbmlList *list = data_off;
1082
                char *ptr = list->elem;
1083
                for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
1084
                    ebml_free(syntax[i].def.n, ptr);
1085
                av_free(list->elem);
1086
            } else
1087
                ebml_free(syntax[i].def.n, data_off);
1088
        default:  break;
1089
        }
1090
    }
1091
}
1092

    
1093
static int
1094
matroska_decode_buffer(uint8_t** buf, int* buf_size, MatroskaTrack *track)
1095
{
1096
    MatroskaTrackEncoding *encodings = track->encodings.elem;
1097
    uint8_t* data = *buf;
1098
    int isize = *buf_size;
1099
    uint8_t* pkt_data = NULL;
1100
    int pkt_size = isize;
1101
    int result = 0;
1102
    int olen;
1103

    
1104
    switch (encodings[0].compression.algo) {
1105
    case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
1106
        return encodings[0].compression.settings.size;
1107
    case MATROSKA_TRACK_ENCODING_COMP_LZO:
1108
        do {
1109
            olen = pkt_size *= 3;
1110
            pkt_data = av_realloc(pkt_data,
1111
                                  pkt_size+LZO_OUTPUT_PADDING);
1112
            result = lzo1x_decode(pkt_data, &olen, data, &isize);
1113
        } while (result==LZO_OUTPUT_FULL && pkt_size<10000000);
1114
        if (result)
1115
            goto failed;
1116
        pkt_size -= olen;
1117
        break;
1118
#ifdef CONFIG_ZLIB
1119
    case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
1120
        z_stream zstream = {0};
1121
        if (inflateInit(&zstream) != Z_OK)
1122
            return -1;
1123
        zstream.next_in = data;
1124
        zstream.avail_in = isize;
1125
        do {
1126
            pkt_size *= 3;
1127
            pkt_data = av_realloc(pkt_data, pkt_size);
1128
            zstream.avail_out = pkt_size - zstream.total_out;
1129
            zstream.next_out = pkt_data + zstream.total_out;
1130
            result = inflate(&zstream, Z_NO_FLUSH);
1131
        } while (result==Z_OK && pkt_size<10000000);
1132
        pkt_size = zstream.total_out;
1133
        inflateEnd(&zstream);
1134
        if (result != Z_STREAM_END)
1135
            goto failed;
1136
        break;
1137
    }
1138
#endif
1139
#ifdef CONFIG_BZLIB
1140
    case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
1141
        bz_stream bzstream = {0};
1142
        if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
1143
            return -1;
1144
        bzstream.next_in = data;
1145
        bzstream.avail_in = isize;
1146
        do {
1147
            pkt_size *= 3;
1148
            pkt_data = av_realloc(pkt_data, pkt_size);
1149
            bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
1150
            bzstream.next_out = pkt_data + bzstream.total_out_lo32;
1151
            result = BZ2_bzDecompress(&bzstream);
1152
        } while (result==BZ_OK && pkt_size<10000000);
1153
        pkt_size = bzstream.total_out_lo32;
1154
        BZ2_bzDecompressEnd(&bzstream);
1155
        if (result != BZ_STREAM_END)
1156
            goto failed;
1157
        break;
1158
    }
1159
#endif
1160
    }
1161

    
1162
    *buf = pkt_data;
1163
    *buf_size = pkt_size;
1164
    return 0;
1165
 failed:
1166
    av_free(pkt_data);
1167
    return -1;
1168
}
1169

    
1170
static void
1171
matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1172
{
1173
    EbmlList *seekhead_list = &matroska->seekhead;
1174
    MatroskaSeekhead *seekhead = seekhead_list->elem;
1175
    uint32_t peek_id_cache = matroska->peek_id;
1176
    uint32_t level_up = matroska->level_up;
1177
    offset_t before_pos = url_ftell(matroska->ctx->pb);
1178
    MatroskaLevel level;
1179
    int i;
1180

    
1181
    for (i=0; i<seekhead_list->nb_elem; i++) {
1182
        if (seekhead[i].pos <= before_pos
1183
            || seekhead[i].id == MATROSKA_ID_SEEKHEAD
1184
            || seekhead[i].id == MATROSKA_ID_CLUSTER)
1185
            continue;
1186

    
1187
        /* seek */
1188
        if (ebml_read_seek(matroska,
1189
                           seekhead[i].pos+matroska->segment_start) < 0)
1190
            continue;
1191

    
1192
        /* we don't want to lose our seekhead level, so we add
1193
         * a dummy. This is a crude hack. */
1194
        if (matroska->num_levels == EBML_MAX_DEPTH) {
1195
            av_log(matroska->ctx, AV_LOG_INFO,
1196
                   "Max EBML element depth (%d) reached, "
1197
                   "cannot parse further.\n", EBML_MAX_DEPTH);
1198
            break;
1199
        }
1200

    
1201
        level.start = 0;
1202
        level.length = (uint64_t)-1;
1203
        matroska->levels[matroska->num_levels] = level;
1204
        matroska->num_levels++;
1205

    
1206
        ebml_parse_id(matroska, matroska_segment, seekhead[i].id, matroska);
1207

    
1208
        /* remove dummy level */
1209
        while (matroska->num_levels) {
1210
            uint64_t length = matroska->levels[--matroska->num_levels].length;
1211
            if (length == (uint64_t)-1)
1212
                break;
1213
        }
1214
    }
1215

    
1216
    /* seek back */
1217
    ebml_read_seek(matroska, before_pos);
1218
    matroska->peek_id = peek_id_cache;
1219
    matroska->level_up = level_up;
1220
}
1221

    
1222
static int
1223
matroska_aac_profile (char *codec_id)
1224
{
1225
    static const char *aac_profiles[] = { "MAIN", "LC", "SSR" };
1226
    int profile;
1227

    
1228
    for (profile=0; profile<ARRAY_SIZE(aac_profiles); profile++)
1229
        if (strstr(codec_id, aac_profiles[profile]))
1230
            break;
1231
    return profile + 1;
1232
}
1233

    
1234
static int
1235
matroska_aac_sri (int samplerate)
1236
{
1237
    int sri;
1238

    
1239
    for (sri=0; sri<ARRAY_SIZE(ff_mpeg4audio_sample_rates); sri++)
1240
        if (ff_mpeg4audio_sample_rates[sri] == samplerate)
1241
            break;
1242
    return sri;
1243
}
1244

    
1245
static int
1246
matroska_read_header (AVFormatContext    *s,
1247
                      AVFormatParameters *ap)
1248
{
1249
    MatroskaDemuxContext *matroska = s->priv_data;
1250
    EbmlList *attachements_list = &matroska->attachments;
1251
    MatroskaAttachement *attachements;
1252
    EbmlList *chapters_list = &matroska->chapters;
1253
    MatroskaChapter *chapters;
1254
    MatroskaTrack *tracks;
1255
    EbmlList *index_list;
1256
    MatroskaIndex *index;
1257
    Ebml ebml = { 0 };
1258
    AVStream *st;
1259
    int i, j;
1260

    
1261
    matroska->ctx = s;
1262

    
1263
    /* First read the EBML header. */
1264
    if (ebml_parse(matroska, ebml_syntax, &ebml, 0, 1)
1265
        || ebml.version > EBML_VERSION       || ebml.max_size > sizeof(uint64_t)
1266
        || ebml.id_length > sizeof(uint32_t) || strcmp(ebml.doctype, "matroska")
1267
        || ebml.doctype_version > 2) {
1268
        av_log(matroska->ctx, AV_LOG_ERROR,
1269
               "EBML header using unsupported features\n"
1270
               "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
1271
               ebml.version, ebml.doctype, ebml.doctype_version);
1272
        return AVERROR_NOFMT;
1273
    }
1274
    ebml_free(ebml_syntax, &ebml);
1275

    
1276
    /* The next thing is a segment. */
1277
    if (ebml_parse(matroska, matroska_segments, matroska, 0, 1) < 0)
1278
        return -1;
1279
    matroska_execute_seekhead(matroska);
1280

    
1281
    if (matroska->duration)
1282
        matroska->ctx->duration = matroska->duration * matroska->time_scale
1283
                                  * 1000 / AV_TIME_BASE;
1284
    if (matroska->title)
1285
        strncpy(matroska->ctx->title, matroska->title,
1286
                sizeof(matroska->ctx->title)-1);
1287

    
1288
    tracks = matroska->tracks.elem;
1289
    for (i=0; i < matroska->tracks.nb_elem; i++) {
1290
        MatroskaTrack *track = &tracks[i];
1291
        enum CodecID codec_id = CODEC_ID_NONE;
1292
        EbmlList *encodings_list = &tracks->encodings;
1293
        MatroskaTrackEncoding *encodings = encodings_list->elem;
1294
        uint8_t *extradata = NULL;
1295
        int extradata_size = 0;
1296
        int extradata_offset = 0;
1297

    
1298
        /* Apply some sanity checks. */
1299
        if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1300
            track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1301
            track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1302
            av_log(matroska->ctx, AV_LOG_INFO,
1303
                   "Unknown or unsupported track type %"PRIu64"\n",
1304
                   track->type);
1305
            continue;
1306
        }
1307
        if (track->codec_id == NULL)
1308
            continue;
1309

    
1310
        if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1311
            if (!track->default_duration)
1312
                track->default_duration = 1000000000/track->video.frame_rate;
1313
            if (!track->video.display_width)
1314
                track->video.display_width = track->video.pixel_width;
1315
            if (!track->video.display_height)
1316
                track->video.display_height = track->video.pixel_height;
1317
        } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1318
            if (!track->audio.out_samplerate)
1319
                track->audio.out_samplerate = track->audio.samplerate;
1320
        }
1321
        if (encodings_list->nb_elem > 1) {
1322
            av_log(matroska->ctx, AV_LOG_ERROR,
1323
                   "Multiple combined encodings no supported");
1324
        } else if (encodings_list->nb_elem == 1) {
1325
            if (encodings[0].type ||
1326
                (encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
1327
#ifdef CONFIG_ZLIB
1328
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1329
#endif
1330
#ifdef CONFIG_BZLIB
1331
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1332
#endif
1333
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
1334
                encodings[0].scope = 0;
1335
                av_log(matroska->ctx, AV_LOG_ERROR,
1336
                       "Unsupported encoding type");
1337
            } else if (track->codec_priv.size && encodings[0].scope&2) {
1338
                uint8_t *codec_priv = track->codec_priv.data;
1339
                int offset = matroska_decode_buffer(&track->codec_priv.data,
1340
                                                    &track->codec_priv.size,
1341
                                                    track);
1342
                if (offset < 0) {
1343
                    track->codec_priv.data = NULL;
1344
                    track->codec_priv.size = 0;
1345
                    av_log(matroska->ctx, AV_LOG_ERROR,
1346
                           "Failed to decode codec private data\n");
1347
                } else if (offset > 0) {
1348
                    track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
1349
                    memcpy(track->codec_priv.data,
1350
                           encodings[0].compression.settings.data, offset);
1351
                    memcpy(track->codec_priv.data+offset, codec_priv,
1352
                           track->codec_priv.size);
1353
                    track->codec_priv.size += offset;
1354
                }
1355
                if (codec_priv != track->codec_priv.data)
1356
                    av_free(codec_priv);
1357
            }
1358
        }
1359

    
1360
        for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
1361
            if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1362
                        strlen(ff_mkv_codec_tags[j].str))){
1363
                codec_id= ff_mkv_codec_tags[j].id;
1364
                break;
1365
            }
1366
        }
1367

    
1368
        st = track->stream = av_new_stream(s, matroska->num_streams++);
1369
        if (st == NULL)
1370
            return AVERROR(ENOMEM);
1371

    
1372
        if (!strcmp(track->codec_id, MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC)
1373
            && track->codec_priv.size >= 40
1374
            && track->codec_priv.data != NULL) {
1375
            track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
1376
            codec_id = codec_get_id(codec_bmp_tags, track->video.fourcc);
1377
        } else if (!strcmp(track->codec_id, MATROSKA_CODEC_ID_AUDIO_ACM)
1378
                   && track->codec_priv.size >= 18
1379
                   && track->codec_priv.data != NULL) {
1380
            uint16_t tag = AV_RL16(track->codec_priv.data);
1381
            codec_id = codec_get_id(codec_wav_tags, tag);
1382
        } else if (!strcmp(track->codec_id, "V_QUICKTIME")
1383
                   && (track->codec_priv.size >= 86)
1384
                   && (track->codec_priv.data != NULL)) {
1385
            track->video.fourcc = AV_RL32(track->codec_priv.data);
1386
            codec_id=codec_get_id(codec_movvideo_tags, track->video.fourcc);
1387
        } else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
1388
            int profile = matroska_aac_profile(track->codec_id);
1389
            int sri = matroska_aac_sri(track->audio.samplerate);
1390
            extradata = av_malloc(5);
1391
            if (extradata == NULL)
1392
                return AVERROR(ENOMEM);
1393
            extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
1394
            extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
1395
            if (strstr(track->codec_id, "SBR")) {
1396
                sri = matroska_aac_sri(track->audio.out_samplerate);
1397
                extradata[2] = 0x56;
1398
                extradata[3] = 0xE5;
1399
                extradata[4] = 0x80 | (sri<<3);
1400
                extradata_size = 5;
1401
            } else
1402
                extradata_size = 2;
1403
        } else if (codec_id == CODEC_ID_TTA) {
1404
            ByteIOContext b;
1405
            extradata_size = 30;
1406
            extradata = av_mallocz(extradata_size);
1407
            if (extradata == NULL)
1408
                return AVERROR(ENOMEM);
1409
            init_put_byte(&b, extradata, extradata_size, 1,
1410
                          NULL, NULL, NULL, NULL);
1411
            put_buffer(&b, "TTA1", 4);
1412
            put_le16(&b, 1);
1413
            put_le16(&b, track->audio.channels);
1414
            put_le16(&b, track->audio.bitdepth);
1415
            put_le32(&b, track->audio.out_samplerate);
1416
            put_le32(&b, matroska->ctx->duration * track->audio.out_samplerate);
1417
        } else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
1418
                   codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
1419
            extradata_offset = 26;
1420
            track->codec_priv.size -= extradata_offset;
1421
        } else if (codec_id == CODEC_ID_RA_144) {
1422
            track->audio.out_samplerate = 8000;
1423
            track->audio.channels = 1;
1424
        } else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
1425
                   codec_id == CODEC_ID_ATRAC3) {
1426
            ByteIOContext b;
1427

    
1428
            init_put_byte(&b, track->codec_priv.data,track->codec_priv.size,
1429
                          0, NULL, NULL, NULL, NULL);
1430
            url_fskip(&b, 24);
1431
            track->audio.coded_framesize = get_be32(&b);
1432
            url_fskip(&b, 12);
1433
            track->audio.sub_packet_h    = get_be16(&b);
1434
            track->audio.frame_size      = get_be16(&b);
1435
            track->audio.sub_packet_size = get_be16(&b);
1436
            track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
1437
            if (codec_id == CODEC_ID_RA_288) {
1438
                st->codec->block_align = track->audio.coded_framesize;
1439
                track->codec_priv.size = 0;
1440
            } else {
1441
                st->codec->block_align = track->audio.sub_packet_size;
1442
                extradata_offset = 78;
1443
                track->codec_priv.size -= extradata_offset;
1444
            }
1445
        }
1446

    
1447
        if (codec_id == CODEC_ID_NONE)
1448
            av_log(matroska->ctx, AV_LOG_INFO,
1449
                   "Unknown/unsupported CodecID %s.\n", track->codec_id);
1450

    
1451
        av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
1452

    
1453
        st->codec->codec_id = codec_id;
1454
        st->start_time = 0;
1455
        if (strcmp(track->language, "und"))
1456
            av_strlcpy(st->language, track->language, 4);
1457

    
1458
        if (track->flag_default)
1459
            st->disposition |= AV_DISPOSITION_DEFAULT;
1460

    
1461
        if (track->default_duration)
1462
            av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
1463
                      track->default_duration, 1000000000, 30000);
1464

    
1465
        if(extradata){
1466
            st->codec->extradata = extradata;
1467
            st->codec->extradata_size = extradata_size;
1468
        } else if(track->codec_priv.data && track->codec_priv.size > 0){
1469
            st->codec->extradata = av_malloc(track->codec_priv.size);
1470
            if(st->codec->extradata == NULL)
1471
                return AVERROR(ENOMEM);
1472
            st->codec->extradata_size = track->codec_priv.size;
1473
            memcpy(st->codec->extradata,
1474
                   track->codec_priv.data + extradata_offset,
1475
                   track->codec_priv.size);
1476
        }
1477

    
1478
        if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1479
            st->codec->codec_type = CODEC_TYPE_VIDEO;
1480
            st->codec->codec_tag  = track->video.fourcc;
1481
            st->codec->width  = track->video.pixel_width;
1482
            st->codec->height = track->video.pixel_height;
1483
            av_reduce(&st->codec->sample_aspect_ratio.num,
1484
                      &st->codec->sample_aspect_ratio.den,
1485
                      st->codec->height * track->video.display_width,
1486
                      st->codec-> width * track->video.display_height,
1487
                      255);
1488
            st->need_parsing = AVSTREAM_PARSE_HEADERS;
1489
        } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1490
            st->codec->codec_type = CODEC_TYPE_AUDIO;
1491
            st->codec->sample_rate = track->audio.out_samplerate;
1492
            st->codec->channels = track->audio.channels;
1493
        } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1494
            st->codec->codec_type = CODEC_TYPE_SUBTITLE;
1495
        }
1496
    }
1497

    
1498
    attachements = attachements_list->elem;
1499
    for (j=0; j<attachements_list->nb_elem; j++) {
1500
        if (!(attachements[j].filename && attachements[j].mime &&
1501
              attachements[j].bin.data && attachements[j].bin.size > 0)) {
1502
            av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
1503
        } else {
1504
            AVStream *st = av_new_stream(s, matroska->num_streams++);
1505
            if (st == NULL)
1506
                break;
1507
            st->filename          = av_strdup(attachements[j].filename);
1508
            st->codec->codec_id = CODEC_ID_NONE;
1509
            st->codec->codec_type = CODEC_TYPE_ATTACHMENT;
1510
            st->codec->extradata  = av_malloc(attachements[j].bin.size);
1511
            if(st->codec->extradata == NULL)
1512
                break;
1513
            st->codec->extradata_size = attachements[j].bin.size;
1514
            memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
1515

    
1516
            for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
1517
                if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
1518
                             strlen(ff_mkv_mime_tags[i].str))) {
1519
                    st->codec->codec_id = ff_mkv_mime_tags[i].id;
1520
                    break;
1521
                }
1522
            }
1523
        }
1524
    }
1525

    
1526
    chapters = chapters_list->elem;
1527
    for (i=0; i<chapters_list->nb_elem; i++)
1528
        if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid)
1529
            ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
1530
                           chapters[i].start, chapters[i].end,
1531
                           chapters[i].title);
1532

    
1533
    index_list = &matroska->index;
1534
    index = index_list->elem;
1535
    for (i=0; i<index_list->nb_elem; i++) {
1536
        EbmlList *pos_list = &index[i].pos;
1537
        MatroskaIndexPos *pos = pos_list->elem;
1538
        for (j=0; j<pos_list->nb_elem; j++) {
1539
            MatroskaTrack *track = matroska_find_track_by_num(matroska,
1540
                                                              pos[j].track);
1541
            if (track && track->stream)
1542
                av_add_index_entry(track->stream,
1543
                                   pos[j].pos + matroska->segment_start,
1544
                                   index[i].time*matroska->time_scale/AV_TIME_BASE,
1545
                                   0, 0, AVINDEX_KEYFRAME);
1546
        }
1547
    }
1548

    
1549
    return 0;
1550
}
1551

    
1552
static int
1553
matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data, int size,
1554
                     int64_t pos, uint64_t cluster_time, uint64_t duration,
1555
                     int is_keyframe)
1556
{
1557
    MatroskaTrack *track;
1558
    int res = 0;
1559
    AVStream *st;
1560
    AVPacket *pkt;
1561
    int16_t block_time;
1562
    uint32_t *lace_size = NULL;
1563
    int n, flags, laces = 0;
1564
    uint64_t num;
1565

    
1566
    if ((n = matroska_ebmlnum_uint(data, size, &num)) < 0) {
1567
        av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
1568
        return res;
1569
    }
1570
    data += n;
1571
    size -= n;
1572

    
1573
    track = matroska_find_track_by_num(matroska, num);
1574
    if (size <= 3 || !track || !track->stream) {
1575
        av_log(matroska->ctx, AV_LOG_INFO,
1576
               "Invalid stream %"PRIu64" or size %u\n", num, size);
1577
        return res;
1578
    }
1579
    st = track->stream;
1580
    if (st->discard >= AVDISCARD_ALL)
1581
        return res;
1582
    if (duration == AV_NOPTS_VALUE)
1583
        duration = track->default_duration / matroska->time_scale;
1584

    
1585
    block_time = AV_RB16(data);
1586
    data += 2;
1587
    flags = *data++;
1588
    size -= 3;
1589
    if (is_keyframe == -1)
1590
        is_keyframe = flags & 0x80 ? PKT_FLAG_KEY : 0;
1591

    
1592
    if (matroska->skip_to_keyframe) {
1593
        if (!is_keyframe || st != matroska->skip_to_stream)
1594
            return res;
1595
        matroska->skip_to_keyframe = 0;
1596
    }
1597

    
1598
    switch ((flags & 0x06) >> 1) {
1599
        case 0x0: /* no lacing */
1600
            laces = 1;
1601
            lace_size = av_mallocz(sizeof(int));
1602
            lace_size[0] = size;
1603
            break;
1604

    
1605
        case 0x1: /* xiph lacing */
1606
        case 0x2: /* fixed-size lacing */
1607
        case 0x3: /* EBML lacing */
1608
            assert(size>0); // size <=3 is checked before size-=3 above
1609
            laces = (*data) + 1;
1610
            data += 1;
1611
            size -= 1;
1612
            lace_size = av_mallocz(laces * sizeof(int));
1613

    
1614
            switch ((flags & 0x06) >> 1) {
1615
                case 0x1: /* xiph lacing */ {
1616
                    uint8_t temp;
1617
                    uint32_t total = 0;
1618
                    for (n = 0; res == 0 && n < laces - 1; n++) {
1619
                        while (1) {
1620
                            if (size == 0) {
1621
                                res = -1;
1622
                                break;
1623
                            }
1624
                            temp = *data;
1625
                            lace_size[n] += temp;
1626
                            data += 1;
1627
                            size -= 1;
1628
                            if (temp != 0xff)
1629
                                break;
1630
                        }
1631
                        total += lace_size[n];
1632
                    }
1633
                    lace_size[n] = size - total;
1634
                    break;
1635
                }
1636

    
1637
                case 0x2: /* fixed-size lacing */
1638
                    for (n = 0; n < laces; n++)
1639
                        lace_size[n] = size / laces;
1640
                    break;
1641

    
1642
                case 0x3: /* EBML lacing */ {
1643
                    uint32_t total;
1644
                    n = matroska_ebmlnum_uint(data, size, &num);
1645
                    if (n < 0) {
1646
                        av_log(matroska->ctx, AV_LOG_INFO,
1647
                               "EBML block data error\n");
1648
                        break;
1649
                    }
1650
                    data += n;
1651
                    size -= n;
1652
                    total = lace_size[0] = num;
1653
                    for (n = 1; res == 0 && n < laces - 1; n++) {
1654
                        int64_t snum;
1655
                        int r;
1656
                        r = matroska_ebmlnum_sint (data, size, &snum);
1657
                        if (r < 0) {
1658
                            av_log(matroska->ctx, AV_LOG_INFO,
1659
                                   "EBML block data error\n");
1660
                            break;
1661
                        }
1662
                        data += r;
1663
                        size -= r;
1664
                        lace_size[n] = lace_size[n - 1] + snum;
1665
                        total += lace_size[n];
1666
                    }
1667
                    lace_size[n] = size - total;
1668
                    break;
1669
                }
1670
            }
1671
            break;
1672
    }
1673

    
1674
    if (res == 0) {
1675
        uint64_t timecode = AV_NOPTS_VALUE;
1676

    
1677
        if (cluster_time != (uint64_t)-1
1678
            && (block_time >= 0 || cluster_time >= -block_time))
1679
            timecode = cluster_time + block_time;
1680

    
1681
        for (n = 0; n < laces; n++) {
1682
            if (st->codec->codec_id == CODEC_ID_RA_288 ||
1683
                st->codec->codec_id == CODEC_ID_COOK ||
1684
                st->codec->codec_id == CODEC_ID_ATRAC3) {
1685
                int a = st->codec->block_align;
1686
                int sps = track->audio.sub_packet_size;
1687
                int cfs = track->audio.coded_framesize;
1688
                int h = track->audio.sub_packet_h;
1689
                int y = track->audio.sub_packet_cnt;
1690
                int w = track->audio.frame_size;
1691
                int x;
1692

    
1693
                if (!track->audio.pkt_cnt) {
1694
                    if (st->codec->codec_id == CODEC_ID_RA_288)
1695
                        for (x=0; x<h/2; x++)
1696
                            memcpy(track->audio.buf+x*2*w+y*cfs,
1697
                                   data+x*cfs, cfs);
1698
                    else
1699
                        for (x=0; x<w/sps; x++)
1700
                            memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
1701

    
1702
                    if (++track->audio.sub_packet_cnt >= h) {
1703
                        track->audio.sub_packet_cnt = 0;
1704
                        track->audio.pkt_cnt = h*w / a;
1705
                    }
1706
                }
1707
                while (track->audio.pkt_cnt) {
1708
                    pkt = av_mallocz(sizeof(AVPacket));
1709
                    av_new_packet(pkt, a);
1710
                    memcpy(pkt->data, track->audio.buf
1711
                           + a * (h*w / a - track->audio.pkt_cnt--), a);
1712
                    pkt->pos = pos;
1713
                    pkt->stream_index = st->index;
1714
                    matroska_queue_packet(matroska, pkt);
1715
                }
1716
            } else {
1717
                MatroskaTrackEncoding *encodings = track->encodings.elem;
1718
                int offset = 0, pkt_size = lace_size[n];
1719
                uint8_t *pkt_data = data;
1720

    
1721
                if (encodings && encodings->scope & 1) {
1722
                    offset = matroska_decode_buffer(&pkt_data,&pkt_size, track);
1723
                    if (offset < 0)
1724
                        continue;
1725
                }
1726

    
1727
                pkt = av_mallocz(sizeof(AVPacket));
1728
                /* XXX: prevent data copy... */
1729
                if (av_new_packet(pkt, pkt_size+offset) < 0) {
1730
                    av_free(pkt);
1731
                    res = AVERROR(ENOMEM);
1732
                    n = laces-1;
1733
                    break;
1734
                }
1735
                if (offset)
1736
                    memcpy (pkt->data, encodings->compression.settings.data, offset);
1737
                memcpy (pkt->data+offset, pkt_data, pkt_size);
1738

    
1739
                if (pkt_data != data)
1740
                    av_free(pkt_data);
1741

    
1742
                if (n == 0)
1743
                    pkt->flags = is_keyframe;
1744
                pkt->stream_index = st->index;
1745

    
1746
                pkt->pts = timecode;
1747
                pkt->pos = pos;
1748
                pkt->duration = duration;
1749

    
1750
                matroska_queue_packet(matroska, pkt);
1751
            }
1752

    
1753
            if (timecode != AV_NOPTS_VALUE)
1754
                timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
1755
            data += lace_size[n];
1756
        }
1757
    }
1758

    
1759
    av_free(lace_size);
1760
    return res;
1761
}
1762

    
1763
static int
1764
matroska_parse_cluster (MatroskaDemuxContext *matroska)
1765
{
1766
    MatroskaCluster cluster = { 0 };
1767
    EbmlList *blocks_list;
1768
    MatroskaBlock *blocks;
1769
    int i, res = ebml_parse(matroska, matroska_clusters, &cluster, 0, 1);
1770
    blocks_list = &cluster.blocks;
1771
    blocks = blocks_list->elem;
1772
    for (i=0; !res && i<blocks_list->nb_elem; i++)
1773
        if (blocks[i].bin.size > 0)
1774
            res=matroska_parse_block(matroska,
1775
                                     blocks[i].bin.data, blocks[i].bin.size,
1776
                                     blocks[i].bin.pos,  cluster.timecode,
1777
                                     blocks[i].duration, !blocks[i].reference);
1778
    ebml_free(matroska_cluster, &cluster);
1779
    return res;
1780
}
1781

    
1782
static int
1783
matroska_read_packet (AVFormatContext *s,
1784
                      AVPacket        *pkt)
1785
{
1786
    MatroskaDemuxContext *matroska = s->priv_data;
1787

    
1788
    while (matroska_deliver_packet(matroska, pkt)) {
1789
        if (matroska->done)
1790
            return AVERROR(EIO);
1791
        if (matroska_parse_cluster(matroska) < 0)
1792
            matroska->done = 1;
1793
    }
1794

    
1795
    return 0;
1796
}
1797

    
1798
static int
1799
matroska_read_seek (AVFormatContext *s, int stream_index, int64_t timestamp,
1800
                    int flags)
1801
{
1802
    MatroskaDemuxContext *matroska = s->priv_data;
1803
    AVStream *st = s->streams[stream_index];
1804
    int index;
1805

    
1806
    index = av_index_search_timestamp(st, timestamp, flags);
1807
    if (index < 0)
1808
        return 0;
1809

    
1810
    matroska_clear_queue(matroska);
1811

    
1812
    url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
1813
    matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
1814
    matroska->skip_to_stream = st;
1815
    matroska->peek_id = 0;
1816
    av_update_cur_dts(s, st, st->index_entries[index].timestamp);
1817
    return 0;
1818
}
1819

    
1820
static int
1821
matroska_read_close (AVFormatContext *s)
1822
{
1823
    MatroskaDemuxContext *matroska = s->priv_data;
1824
    MatroskaTrack *tracks = matroska->tracks.elem;
1825
    int n;
1826

    
1827
    matroska_clear_queue(matroska);
1828

    
1829
    for (n=0; n < matroska->tracks.nb_elem; n++)
1830
        if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
1831
            av_free(tracks[n].audio.buf);
1832
    ebml_free(matroska_segment, matroska);
1833

    
1834
    return 0;
1835
}
1836

    
1837
AVInputFormat matroska_demuxer = {
1838
    "matroska",
1839
    NULL_IF_CONFIG_SMALL("Matroska file format"),
1840
    sizeof(MatroskaDemuxContext),
1841
    matroska_probe,
1842
    matroska_read_header,
1843
    matroska_read_packet,
1844
    matroska_read_close,
1845
    matroska_read_seek,
1846
};