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ffmpeg / libavformat / matroskadec.c @ 325ace3e

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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 libavformat/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 <stdio.h>
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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/intreadwrite.h"
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#include "libavutil/avstring.h"
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#include "libavutil/lzo.h"
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#if CONFIG_ZLIB
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#include <zlib.h>
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#endif
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#if 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;
60

    
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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;
78

    
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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;
84

    
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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;
92

    
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typedef struct {
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    uint64_t algo;
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    EbmlBin  settings;
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} MatroskaTrackCompression;
97

    
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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;
112

    
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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;
128

    
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typedef struct {
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    uint64_t num;
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    uint64_t uid;
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    uint64_t type;
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    char    *name;
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    char    *codec_id;
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    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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    int64_t end_timecode;
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} MatroskaTrack;
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typedef struct {
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    uint64_t uid;
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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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    AVChapter *chapter;
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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;
168

    
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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;
179

    
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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;
189

    
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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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    int64_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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    AVPacket *prev_pkt;
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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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    uint64_t skip_to_timecode;
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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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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 }
244
};
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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 }
278
};
279

    
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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} },
282
    { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ,EBML_FLOAT,0,offsetof(MatroskaTrackAudio,out_samplerate) },
283
    { MATROSKA_ID_AUDIOBITDEPTH,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,bitdepth) },
284
    { MATROSKA_ID_AUDIOCHANNELS,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,channels), {.u=1} },
285
    { 0 }
286
};
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static EbmlSyntax matroska_track_encoding_compression[] = {
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    { MATROSKA_ID_ENCODINGCOMPALGO,   EBML_UINT, 0, offsetof(MatroskaTrackCompression,algo), {.u=0} },
290
    { MATROSKA_ID_ENCODINGCOMPSETTINGS,EBML_BIN, 0, offsetof(MatroskaTrackCompression,settings) },
291
    { 0 }
292
};
293

    
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static EbmlSyntax matroska_track_encoding[] = {
295
    { MATROSKA_ID_ENCODINGSCOPE,      EBML_UINT, 0, offsetof(MatroskaTrackEncoding,scope), {.u=1} },
296
    { MATROSKA_ID_ENCODINGTYPE,       EBML_UINT, 0, offsetof(MatroskaTrackEncoding,type), {.u=0} },
297
    { MATROSKA_ID_ENCODINGCOMPRESSION,EBML_NEST, 0, offsetof(MatroskaTrackEncoding,compression), {.n=matroska_track_encoding_compression} },
298
    { MATROSKA_ID_ENCODINGORDER,      EBML_NONE },
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    { 0 }
300
};
301

    
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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} },
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    { 0 }
305
};
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static EbmlSyntax matroska_track[] = {
308
    { MATROSKA_ID_TRACKNUMBER,          EBML_UINT, 0, offsetof(MatroskaTrack,num) },
309
    { MATROSKA_ID_TRACKNAME,            EBML_UTF8, 0, offsetof(MatroskaTrack,name) },
310
    { MATROSKA_ID_TRACKUID,             EBML_UINT, 0, offsetof(MatroskaTrack,uid) },
311
    { MATROSKA_ID_TRACKTYPE,            EBML_UINT, 0, offsetof(MatroskaTrack,type) },
312
    { MATROSKA_ID_CODECID,              EBML_STR,  0, offsetof(MatroskaTrack,codec_id) },
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    { MATROSKA_ID_CODECPRIVATE,         EBML_BIN,  0, offsetof(MatroskaTrack,codec_priv) },
314
    { MATROSKA_ID_TRACKLANGUAGE,        EBML_UTF8, 0, offsetof(MatroskaTrack,language), {.s="eng"} },
315
    { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack,default_duration) },
316
    { MATROSKA_ID_TRACKTIMECODESCALE,   EBML_FLOAT,0, offsetof(MatroskaTrack,time_scale), {.f=1.0} },
317
    { MATROSKA_ID_TRACKFLAGDEFAULT,     EBML_UINT, 0, offsetof(MatroskaTrack,flag_default), {.u=1} },
318
    { MATROSKA_ID_TRACKVIDEO,           EBML_NEST, 0, offsetof(MatroskaTrack,video), {.n=matroska_track_video} },
319
    { MATROSKA_ID_TRACKAUDIO,           EBML_NEST, 0, offsetof(MatroskaTrack,audio), {.n=matroska_track_audio} },
320
    { MATROSKA_ID_TRACKCONTENTENCODINGS,EBML_NEST, 0, 0, {.n=matroska_track_encodings} },
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    { MATROSKA_ID_TRACKFLAGENABLED,     EBML_NONE },
322
    { MATROSKA_ID_TRACKFLAGFORCED,      EBML_NONE },
323
    { MATROSKA_ID_TRACKFLAGLACING,      EBML_NONE },
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    { MATROSKA_ID_CODECNAME,            EBML_NONE },
325
    { MATROSKA_ID_CODECDECODEALL,       EBML_NONE },
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    { MATROSKA_ID_CODECINFOURL,         EBML_NONE },
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    { MATROSKA_ID_CODECDOWNLOADURL,     EBML_NONE },
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    { MATROSKA_ID_TRACKMINCACHE,        EBML_NONE },
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    { MATROSKA_ID_TRACKMAXCACHE,        EBML_NONE },
330
    { MATROSKA_ID_TRACKMAXBLKADDID,     EBML_NONE },
331
    { 0 }
332
};
333

    
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static EbmlSyntax matroska_tracks[] = {
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    { MATROSKA_ID_TRACKENTRY,         EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext,tracks), {.n=matroska_track} },
336
    { 0 }
337
};
338

    
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static EbmlSyntax matroska_attachment[] = {
340
    { MATROSKA_ID_FILEUID,            EBML_UINT, 0, offsetof(MatroskaAttachement,uid) },
341
    { MATROSKA_ID_FILENAME,           EBML_UTF8, 0, offsetof(MatroskaAttachement,filename) },
342
    { MATROSKA_ID_FILEMIMETYPE,       EBML_STR,  0, offsetof(MatroskaAttachement,mime) },
343
    { MATROSKA_ID_FILEDATA,           EBML_BIN,  0, offsetof(MatroskaAttachement,bin) },
344
    { MATROSKA_ID_FILEDESC,           EBML_NONE },
345
    { 0 }
346
};
347

    
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static EbmlSyntax matroska_attachments[] = {
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    { MATROSKA_ID_ATTACHEDFILE,       EBML_NEST, sizeof(MatroskaAttachement), offsetof(MatroskaDemuxContext,attachments), {.n=matroska_attachment} },
350
    { 0 }
351
};
352

    
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static EbmlSyntax matroska_chapter_display[] = {
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    { MATROSKA_ID_CHAPSTRING,         EBML_UTF8, 0, offsetof(MatroskaChapter,title) },
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    { MATROSKA_ID_CHAPLANG,           EBML_NONE },
356
    { 0 }
357
};
358

    
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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} },
361
    { MATROSKA_ID_CHAPTERTIMEEND,     EBML_UINT, 0, offsetof(MatroskaChapter,end), {.u=AV_NOPTS_VALUE} },
362
    { MATROSKA_ID_CHAPTERUID,         EBML_UINT, 0, offsetof(MatroskaChapter,uid) },
363
    { MATROSKA_ID_CHAPTERDISPLAY,     EBML_NEST, 0, 0, {.n=matroska_chapter_display} },
364
    { MATROSKA_ID_CHAPTERFLAGHIDDEN,  EBML_NONE },
365
    { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
366
    { MATROSKA_ID_CHAPTERPHYSEQUIV,   EBML_NONE },
367
    { MATROSKA_ID_CHAPTERATOM,        EBML_NONE },
368
    { 0 }
369
};
370

    
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static EbmlSyntax matroska_chapter[] = {
372
    { MATROSKA_ID_CHAPTERATOM,        EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext,chapters), {.n=matroska_chapter_entry} },
373
    { MATROSKA_ID_EDITIONUID,         EBML_NONE },
374
    { MATROSKA_ID_EDITIONFLAGHIDDEN,  EBML_NONE },
375
    { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
376
    { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
377
    { 0 }
378
};
379

    
380
static EbmlSyntax matroska_chapters[] = {
381
    { MATROSKA_ID_EDITIONENTRY,       EBML_NEST, 0, 0, {.n=matroska_chapter} },
382
    { 0 }
383
};
384

    
385
static EbmlSyntax matroska_index_pos[] = {
386
    { MATROSKA_ID_CUETRACK,           EBML_UINT, 0, offsetof(MatroskaIndexPos,track) },
387
    { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos,pos)   },
388
    { MATROSKA_ID_CUEBLOCKNUMBER,     EBML_NONE },
389
    { 0 }
390
};
391

    
392
static EbmlSyntax matroska_index_entry[] = {
393
    { MATROSKA_ID_CUETIME,            EBML_UINT, 0, offsetof(MatroskaIndex,time) },
394
    { MATROSKA_ID_CUETRACKPOSITION,   EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex,pos), {.n=matroska_index_pos} },
395
    { 0 }
396
};
397

    
398
static EbmlSyntax matroska_index[] = {
399
    { MATROSKA_ID_POINTENTRY,         EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext,index), {.n=matroska_index_entry} },
400
    { 0 }
401
};
402

    
403
static EbmlSyntax matroska_simpletag[] = {
404
    { MATROSKA_ID_TAGNAME,            EBML_UTF8, 0, offsetof(MatroskaTag,name) },
405
    { MATROSKA_ID_TAGSTRING,          EBML_UTF8, 0, offsetof(MatroskaTag,string) },
406
    { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag,sub), {.n=matroska_simpletag} },
407
    { MATROSKA_ID_TAGLANG,            EBML_NONE },
408
    { MATROSKA_ID_TAGDEFAULT,         EBML_NONE },
409
    { 0 }
410
};
411

    
412
static EbmlSyntax matroska_tag[] = {
413
    { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), 0, {.n=matroska_simpletag} },
414
    { MATROSKA_ID_TAGTARGETS,         EBML_NONE },
415
    { 0 }
416
};
417

    
418
static EbmlSyntax matroska_tags[] = {
419
    { MATROSKA_ID_TAG,                EBML_NEST, 0, offsetof(MatroskaDemuxContext,tags), {.n=matroska_tag} },
420
    { 0 }
421
};
422

    
423
static EbmlSyntax matroska_seekhead_entry[] = {
424
    { MATROSKA_ID_SEEKID,             EBML_UINT, 0, offsetof(MatroskaSeekhead,id) },
425
    { MATROSKA_ID_SEEKPOSITION,       EBML_UINT, 0, offsetof(MatroskaSeekhead,pos), {.u=-1} },
426
    { 0 }
427
};
428

    
429
static EbmlSyntax matroska_seekhead[] = {
430
    { MATROSKA_ID_SEEKENTRY,          EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext,seekhead), {.n=matroska_seekhead_entry} },
431
    { 0 }
432
};
433

    
434
static EbmlSyntax matroska_segment[] = {
435
    { MATROSKA_ID_INFO,           EBML_NEST, 0, 0, {.n=matroska_info       } },
436
    { MATROSKA_ID_TRACKS,         EBML_NEST, 0, 0, {.n=matroska_tracks     } },
437
    { MATROSKA_ID_ATTACHMENTS,    EBML_NEST, 0, 0, {.n=matroska_attachments} },
438
    { MATROSKA_ID_CHAPTERS,       EBML_NEST, 0, 0, {.n=matroska_chapters   } },
439
    { MATROSKA_ID_CUES,           EBML_NEST, 0, 0, {.n=matroska_index      } },
440
    { MATROSKA_ID_TAGS,           EBML_NEST, 0, 0, {.n=matroska_tags       } },
441
    { MATROSKA_ID_SEEKHEAD,       EBML_NEST, 0, 0, {.n=matroska_seekhead   } },
442
    { MATROSKA_ID_CLUSTER,        EBML_STOP, 0, offsetof(MatroskaDemuxContext,has_cluster_id) },
443
    { 0 }
444
};
445

    
446
static EbmlSyntax matroska_segments[] = {
447
    { MATROSKA_ID_SEGMENT,        EBML_NEST, 0, 0, {.n=matroska_segment    } },
448
    { 0 }
449
};
450

    
451
static EbmlSyntax matroska_blockgroup[] = {
452
    { MATROSKA_ID_BLOCK,          EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
453
    { MATROSKA_ID_SIMPLEBLOCK,    EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
454
    { MATROSKA_ID_BLOCKDURATION,  EBML_UINT, 0, offsetof(MatroskaBlock,duration), {.u=AV_NOPTS_VALUE} },
455
    { MATROSKA_ID_BLOCKREFERENCE, EBML_UINT, 0, offsetof(MatroskaBlock,reference) },
456
    { 0 }
457
};
458

    
459
static EbmlSyntax matroska_cluster[] = {
460
    { MATROSKA_ID_CLUSTERTIMECODE,EBML_UINT,0, offsetof(MatroskaCluster,timecode) },
461
    { MATROSKA_ID_BLOCKGROUP,     EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
462
    { MATROSKA_ID_SIMPLEBLOCK,    EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
463
    { MATROSKA_ID_CLUSTERPOSITION,EBML_NONE },
464
    { MATROSKA_ID_CLUSTERPREVSIZE,EBML_NONE },
465
    { 0 }
466
};
467

    
468
static EbmlSyntax matroska_clusters[] = {
469
    { MATROSKA_ID_CLUSTER,        EBML_NEST, 0, 0, {.n=matroska_cluster} },
470
    { MATROSKA_ID_INFO,           EBML_NONE },
471
    { MATROSKA_ID_CUES,           EBML_NONE },
472
    { MATROSKA_ID_TAGS,           EBML_NONE },
473
    { MATROSKA_ID_SEEKHEAD,       EBML_NONE },
474
    { 0 }
475
};
476

    
477
#define SIZE_OFF(x) sizeof(((AVFormatContext*)0)->x),offsetof(AVFormatContext,x)
478
const struct {
479
    const char name[16];
480
    int   size;
481
    int   offset;
482
} metadata[] = {
483
    { "TITLE",           SIZE_OFF(title)      },
484
    { "ARTIST",          SIZE_OFF(author)     },
485
    { "WRITTEN_BY",      SIZE_OFF(author)     },
486
    { "LEAD_PERFORMER",  SIZE_OFF(author)     },
487
    { "COPYRIGHT",       SIZE_OFF(copyright)  },
488
    { "COMMENT",         SIZE_OFF(comment)    },
489
    { "ALBUM",           SIZE_OFF(album)      },
490
    { "DATE_WRITTEN",    SIZE_OFF(year)       },
491
    { "DATE_RELEASED",   SIZE_OFF(year)       },
492
    { "PART_NUMBER",     SIZE_OFF(track)      },
493
    { "GENRE",           SIZE_OFF(genre)      },
494
};
495

    
496
/*
497
 * Return: Whether we reached the end of a level in the hierarchy or not.
498
 */
499
static int ebml_level_end(MatroskaDemuxContext *matroska)
500
{
501
    ByteIOContext *pb = matroska->ctx->pb;
502
    int64_t pos = url_ftell(pb);
503

    
504
    if (matroska->num_levels > 0) {
505
        MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
506
        if (pos - level->start >= level->length) {
507
            matroska->num_levels--;
508
            return 1;
509
        }
510
    }
511
    return 0;
512
}
513

    
514
/*
515
 * Read: an "EBML number", which is defined as a variable-length
516
 * array of bytes. The first byte indicates the length by giving a
517
 * number of 0-bits followed by a one. The position of the first
518
 * "one" bit inside the first byte indicates the length of this
519
 * number.
520
 * Returns: number of bytes read, < 0 on error
521
 */
522
static int ebml_read_num(MatroskaDemuxContext *matroska, ByteIOContext *pb,
523
                         int max_size, uint64_t *number)
524
{
525
    int len_mask = 0x80, read = 1, n = 1;
526
    int64_t total = 0;
527

    
528
    /* The first byte tells us the length in bytes - get_byte() can normally
529
     * return 0, but since that's not a valid first ebmlID byte, we can
530
     * use it safely here to catch EOS. */
531
    if (!(total = get_byte(pb))) {
532
        /* we might encounter EOS here */
533
        if (!url_feof(pb)) {
534
            int64_t pos = url_ftell(pb);
535
            av_log(matroska->ctx, AV_LOG_ERROR,
536
                   "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
537
                   pos, pos);
538
        }
539
        return AVERROR(EIO); /* EOS or actual I/O error */
540
    }
541

    
542
    /* get the length of the EBML number */
543
    while (read <= max_size && !(total & len_mask)) {
544
        read++;
545
        len_mask >>= 1;
546
    }
547
    if (read > max_size) {
548
        int64_t pos = url_ftell(pb) - 1;
549
        av_log(matroska->ctx, AV_LOG_ERROR,
550
               "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
551
               (uint8_t) total, pos, pos);
552
        return AVERROR_INVALIDDATA;
553
    }
554

    
555
    /* read out length */
556
    total &= ~len_mask;
557
    while (n++ < read)
558
        total = (total << 8) | get_byte(pb);
559

    
560
    *number = total;
561

    
562
    return read;
563
}
564

    
565
/*
566
 * Read the next element as an unsigned int.
567
 * 0 is success, < 0 is failure.
568
 */
569
static int ebml_read_uint(ByteIOContext *pb, int size, uint64_t *num)
570
{
571
    int n = 0;
572

    
573
    if (size < 1 || size > 8)
574
        return AVERROR_INVALIDDATA;
575

    
576
    /* big-endian ordering; build up number */
577
    *num = 0;
578
    while (n++ < size)
579
        *num = (*num << 8) | get_byte(pb);
580

    
581
    return 0;
582
}
583

    
584
/*
585
 * Read the next element as a float.
586
 * 0 is success, < 0 is failure.
587
 */
588
static int ebml_read_float(ByteIOContext *pb, int size, double *num)
589
{
590
    if (size == 4) {
591
        *num= av_int2flt(get_be32(pb));
592
    } else if(size==8){
593
        *num= av_int2dbl(get_be64(pb));
594
    } else
595
        return AVERROR_INVALIDDATA;
596

    
597
    return 0;
598
}
599

    
600
/*
601
 * Read the next element as an ASCII string.
602
 * 0 is success, < 0 is failure.
603
 */
604
static int ebml_read_ascii(ByteIOContext *pb, int size, char **str)
605
{
606
    av_free(*str);
607
    /* EBML strings are usually not 0-terminated, so we allocate one
608
     * byte more, read the string and NULL-terminate it ourselves. */
609
    if (!(*str = av_malloc(size + 1)))
610
        return AVERROR(ENOMEM);
611
    if (get_buffer(pb, (uint8_t *) *str, size) != size) {
612
        av_free(*str);
613
        return AVERROR(EIO);
614
    }
615
    (*str)[size] = '\0';
616

    
617
    return 0;
618
}
619

    
620
/*
621
 * Read the next element as binary data.
622
 * 0 is success, < 0 is failure.
623
 */
624
static int ebml_read_binary(ByteIOContext *pb, int length, EbmlBin *bin)
625
{
626
    av_free(bin->data);
627
    if (!(bin->data = av_malloc(length)))
628
        return AVERROR(ENOMEM);
629

    
630
    bin->size = length;
631
    bin->pos  = url_ftell(pb);
632
    if (get_buffer(pb, bin->data, length) != length)
633
        return AVERROR(EIO);
634

    
635
    return 0;
636
}
637

    
638
/*
639
 * Read the next element, but only the header. The contents
640
 * are supposed to be sub-elements which can be read separately.
641
 * 0 is success, < 0 is failure.
642
 */
643
static int ebml_read_master(MatroskaDemuxContext *matroska, int length)
644
{
645
    ByteIOContext *pb = matroska->ctx->pb;
646
    MatroskaLevel *level;
647

    
648
    if (matroska->num_levels >= EBML_MAX_DEPTH) {
649
        av_log(matroska->ctx, AV_LOG_ERROR,
650
               "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
651
        return AVERROR(ENOSYS);
652
    }
653

    
654
    level = &matroska->levels[matroska->num_levels++];
655
    level->start = url_ftell(pb);
656
    level->length = length;
657

    
658
    return 0;
659
}
660

    
661
/*
662
 * Read signed/unsigned "EBML" numbers.
663
 * Return: number of bytes processed, < 0 on error
664
 */
665
static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
666
                                 uint8_t *data, uint32_t size, uint64_t *num)
667
{
668
    ByteIOContext pb;
669
    init_put_byte(&pb, data, size, 0, NULL, NULL, NULL, NULL);
670
    return ebml_read_num(matroska, &pb, 8, num);
671
}
672

    
673
/*
674
 * Same as above, but signed.
675
 */
676
static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
677
                                 uint8_t *data, uint32_t size, int64_t *num)
678
{
679
    uint64_t unum;
680
    int res;
681

    
682
    /* read as unsigned number first */
683
    if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
684
        return res;
685

    
686
    /* make signed (weird way) */
687
    *num = unum - ((1LL << (7*res - 1)) - 1);
688

    
689
    return res;
690
}
691

    
692
static int ebml_parse_elem(MatroskaDemuxContext *matroska,
693
                           EbmlSyntax *syntax, void *data);
694

    
695
static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
696
                         uint32_t id, void *data)
697
{
698
    int i;
699
    for (i=0; syntax[i].id; i++)
700
        if (id == syntax[i].id)
701
            break;
702
    if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32)
703
        av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
704
    return ebml_parse_elem(matroska, &syntax[i], data);
705
}
706

    
707
static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
708
                      void *data)
709
{
710
    uint64_t id;
711
    int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
712
    id |= 1 << 7*res;
713
    return res < 0 ? res : ebml_parse_id(matroska, syntax, id, data);
714
}
715

    
716
static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
717
                           void *data)
718
{
719
    int i, res = 0;
720

    
721
    for (i=0; syntax[i].id; i++)
722
        switch (syntax[i].type) {
723
        case EBML_UINT:
724
            *(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
725
            break;
726
        case EBML_FLOAT:
727
            *(double   *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
728
            break;
729
        case EBML_STR:
730
        case EBML_UTF8:
731
            *(char    **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
732
            break;
733
        }
734

    
735
    while (!res && !ebml_level_end(matroska))
736
        res = ebml_parse(matroska, syntax, data);
737

    
738
    return res;
739
}
740

    
741
static int ebml_parse_elem(MatroskaDemuxContext *matroska,
742
                           EbmlSyntax *syntax, void *data)
743
{
744
    ByteIOContext *pb = matroska->ctx->pb;
745
    uint32_t id = syntax->id;
746
    uint64_t length;
747
    int res;
748

    
749
    data = (char *)data + syntax->data_offset;
750
    if (syntax->list_elem_size) {
751
        EbmlList *list = data;
752
        list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
753
        data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
754
        memset(data, 0, syntax->list_elem_size);
755
        list->nb_elem++;
756
    }
757

    
758
    if (syntax->type != EBML_PASS && syntax->type != EBML_STOP)
759
        if ((res = ebml_read_num(matroska, pb, 8, &length)) < 0)
760
            return res;
761

    
762
    switch (syntax->type) {
763
    case EBML_UINT:  res = ebml_read_uint  (pb, length, data);  break;
764
    case EBML_FLOAT: res = ebml_read_float (pb, length, data);  break;
765
    case EBML_STR:
766
    case EBML_UTF8:  res = ebml_read_ascii (pb, length, data);  break;
767
    case EBML_BIN:   res = ebml_read_binary(pb, length, data);  break;
768
    case EBML_NEST:  if ((res=ebml_read_master(matroska, length)) < 0)
769
                         return res;
770
                     if (id == MATROSKA_ID_SEGMENT)
771
                         matroska->segment_start = url_ftell(matroska->ctx->pb);
772
                     return ebml_parse_nest(matroska, syntax->def.n, data);
773
    case EBML_PASS:  return ebml_parse_id(matroska, syntax->def.n, id, data);
774
    case EBML_STOP:  *(int *)data = 1;      return 1;
775
    default:         return url_fseek(pb,length,SEEK_CUR)<0 ? AVERROR(EIO) : 0;
776
    }
777
    if (res == AVERROR_INVALIDDATA)
778
        av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
779
    else if (res == AVERROR(EIO))
780
        av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
781
    return res;
782
}
783

    
784
static void ebml_free(EbmlSyntax *syntax, void *data)
785
{
786
    int i, j;
787
    for (i=0; syntax[i].id; i++) {
788
        void *data_off = (char *)data + syntax[i].data_offset;
789
        switch (syntax[i].type) {
790
        case EBML_STR:
791
        case EBML_UTF8:  av_freep(data_off);                      break;
792
        case EBML_BIN:   av_freep(&((EbmlBin *)data_off)->data);  break;
793
        case EBML_NEST:
794
            if (syntax[i].list_elem_size) {
795
                EbmlList *list = data_off;
796
                char *ptr = list->elem;
797
                for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
798
                    ebml_free(syntax[i].def.n, ptr);
799
                av_free(list->elem);
800
            } else
801
                ebml_free(syntax[i].def.n, data_off);
802
        default:  break;
803
        }
804
    }
805
}
806

    
807

    
808
/*
809
 * Autodetecting...
810
 */
811
static int matroska_probe(AVProbeData *p)
812
{
813
    uint64_t total = 0;
814
    int len_mask = 0x80, size = 1, n = 1;
815
    static const char probe_data[] = "matroska";
816

    
817
    /* EBML header? */
818
    if (AV_RB32(p->buf) != EBML_ID_HEADER)
819
        return 0;
820

    
821
    /* length of header */
822
    total = p->buf[4];
823
    while (size <= 8 && !(total & len_mask)) {
824
        size++;
825
        len_mask >>= 1;
826
    }
827
    if (size > 8)
828
      return 0;
829
    total &= (len_mask - 1);
830
    while (n < size)
831
        total = (total << 8) | p->buf[4 + n++];
832

    
833
    /* Does the probe data contain the whole header? */
834
    if (p->buf_size < 4 + size + total)
835
      return 0;
836

    
837
    /* The header must contain the document type 'matroska'. For now,
838
     * we don't parse the whole header but simply check for the
839
     * availability of that array of characters inside the header.
840
     * Not fully fool-proof, but good enough. */
841
    for (n = 4+size; n <= 4+size+total-(sizeof(probe_data)-1); n++)
842
        if (!memcmp(p->buf+n, probe_data, sizeof(probe_data)-1))
843
            return AVPROBE_SCORE_MAX;
844

    
845
    return 0;
846
}
847

    
848
static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
849
                                                 int num)
850
{
851
    MatroskaTrack *tracks = matroska->tracks.elem;
852
    int i;
853

    
854
    for (i=0; i < matroska->tracks.nb_elem; i++)
855
        if (tracks[i].num == num)
856
            return &tracks[i];
857

    
858
    av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
859
    return NULL;
860
}
861

    
862
static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
863
                                  MatroskaTrack *track)
864
{
865
    MatroskaTrackEncoding *encodings = track->encodings.elem;
866
    uint8_t* data = *buf;
867
    int isize = *buf_size;
868
    uint8_t* pkt_data = NULL;
869
    int pkt_size = isize;
870
    int result = 0;
871
    int olen;
872

    
873
    switch (encodings[0].compression.algo) {
874
    case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
875
        return encodings[0].compression.settings.size;
876
    case MATROSKA_TRACK_ENCODING_COMP_LZO:
877
        do {
878
            olen = pkt_size *= 3;
879
            pkt_data = av_realloc(pkt_data, pkt_size+AV_LZO_OUTPUT_PADDING);
880
            result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
881
        } while (result==AV_LZO_OUTPUT_FULL && pkt_size<10000000);
882
        if (result)
883
            goto failed;
884
        pkt_size -= olen;
885
        break;
886
#if CONFIG_ZLIB
887
    case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
888
        z_stream zstream = {0};
889
        if (inflateInit(&zstream) != Z_OK)
890
            return -1;
891
        zstream.next_in = data;
892
        zstream.avail_in = isize;
893
        do {
894
            pkt_size *= 3;
895
            pkt_data = av_realloc(pkt_data, pkt_size);
896
            zstream.avail_out = pkt_size - zstream.total_out;
897
            zstream.next_out = pkt_data + zstream.total_out;
898
            result = inflate(&zstream, Z_NO_FLUSH);
899
        } while (result==Z_OK && pkt_size<10000000);
900
        pkt_size = zstream.total_out;
901
        inflateEnd(&zstream);
902
        if (result != Z_STREAM_END)
903
            goto failed;
904
        break;
905
    }
906
#endif
907
#if CONFIG_BZLIB
908
    case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
909
        bz_stream bzstream = {0};
910
        if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
911
            return -1;
912
        bzstream.next_in = data;
913
        bzstream.avail_in = isize;
914
        do {
915
            pkt_size *= 3;
916
            pkt_data = av_realloc(pkt_data, pkt_size);
917
            bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
918
            bzstream.next_out = pkt_data + bzstream.total_out_lo32;
919
            result = BZ2_bzDecompress(&bzstream);
920
        } while (result==BZ_OK && pkt_size<10000000);
921
        pkt_size = bzstream.total_out_lo32;
922
        BZ2_bzDecompressEnd(&bzstream);
923
        if (result != BZ_STREAM_END)
924
            goto failed;
925
        break;
926
    }
927
#endif
928
    default:
929
        return -1;
930
    }
931

    
932
    *buf = pkt_data;
933
    *buf_size = pkt_size;
934
    return 0;
935
 failed:
936
    av_free(pkt_data);
937
    return -1;
938
}
939

    
940
static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
941
                                    AVPacket *pkt, uint64_t display_duration)
942
{
943
    char *line, *layer, *ptr = pkt->data, *end = ptr+pkt->size;
944
    for (; *ptr!=',' && ptr<end-1; ptr++);
945
    if (*ptr == ',')
946
        layer = ++ptr;
947
    for (; *ptr!=',' && ptr<end-1; ptr++);
948
    if (*ptr == ',') {
949
        int64_t end_pts = pkt->pts + display_duration;
950
        int sc = matroska->time_scale * pkt->pts / 10000000;
951
        int ec = matroska->time_scale * end_pts  / 10000000;
952
        int sh, sm, ss, eh, em, es, len;
953
        sh = sc/360000;  sc -= 360000*sh;
954
        sm = sc/  6000;  sc -=   6000*sm;
955
        ss = sc/   100;  sc -=    100*ss;
956
        eh = ec/360000;  ec -= 360000*eh;
957
        em = ec/  6000;  ec -=   6000*em;
958
        es = ec/   100;  ec -=    100*es;
959
        *ptr++ = '\0';
960
        len = 50 + end-ptr + FF_INPUT_BUFFER_PADDING_SIZE;
961
        if (!(line = av_malloc(len)))
962
            return;
963
        snprintf(line,len,"Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
964
                 layer, sh, sm, ss, sc, eh, em, es, ec, ptr);
965
        av_free(pkt->data);
966
        pkt->data = line;
967
        pkt->size = strlen(line);
968
    }
969
}
970

    
971
static void matroska_merge_packets(AVPacket *out, AVPacket *in)
972
{
973
    out->data = av_realloc(out->data, out->size+in->size);
974
    memcpy(out->data+out->size, in->data, in->size);
975
    out->size += in->size;
976
    av_destruct_packet(in);
977
    av_free(in);
978
}
979

    
980
static void matroska_convert_tags(AVFormatContext *s, EbmlList *list)
981
{
982
    MatroskaTag *tags = list->elem;
983
    int i, j;
984

    
985
    for (i=0; i < list->nb_elem; i++) {
986
        for (j=0; j < FF_ARRAY_ELEMS(metadata); j++){
987
            if (!strcmp(tags[i].name, metadata[j].name)) {
988
                int *ptr = (int *)((char *)s + metadata[j].offset);
989
                if (*ptr)  continue;
990
                if (metadata[j].size > sizeof(int))
991
                    av_strlcpy((char *)ptr, tags[i].string, metadata[j].size);
992
                else
993
                    *ptr = atoi(tags[i].string);
994
            }
995
        }
996
        if (tags[i].sub.nb_elem)
997
            matroska_convert_tags(s, &tags[i].sub);
998
    }
999
}
1000

    
1001
static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1002
{
1003
    EbmlList *seekhead_list = &matroska->seekhead;
1004
    MatroskaSeekhead *seekhead = seekhead_list->elem;
1005
    uint32_t level_up = matroska->level_up;
1006
    int64_t before_pos = url_ftell(matroska->ctx->pb);
1007
    MatroskaLevel level;
1008
    int i;
1009

    
1010
    for (i=0; i<seekhead_list->nb_elem; i++) {
1011
        int64_t offset = seekhead[i].pos + matroska->segment_start;
1012

    
1013
        if (seekhead[i].pos <= before_pos
1014
            || seekhead[i].id == MATROSKA_ID_SEEKHEAD
1015
            || seekhead[i].id == MATROSKA_ID_CLUSTER)
1016
            continue;
1017

    
1018
        /* seek */
1019
        if (url_fseek(matroska->ctx->pb, offset, SEEK_SET) != offset)
1020
            continue;
1021

    
1022
        /* We don't want to lose our seekhead level, so we add
1023
         * a dummy. This is a crude hack. */
1024
        if (matroska->num_levels == EBML_MAX_DEPTH) {
1025
            av_log(matroska->ctx, AV_LOG_INFO,
1026
                   "Max EBML element depth (%d) reached, "
1027
                   "cannot parse further.\n", EBML_MAX_DEPTH);
1028
            break;
1029
        }
1030

    
1031
        level.start = 0;
1032
        level.length = (uint64_t)-1;
1033
        matroska->levels[matroska->num_levels] = level;
1034
        matroska->num_levels++;
1035

    
1036
        ebml_parse(matroska, matroska_segment, matroska);
1037

    
1038
        /* remove dummy level */
1039
        while (matroska->num_levels) {
1040
            uint64_t length = matroska->levels[--matroska->num_levels].length;
1041
            if (length == (uint64_t)-1)
1042
                break;
1043
        }
1044
    }
1045

    
1046
    /* seek back */
1047
    url_fseek(matroska->ctx->pb, before_pos, SEEK_SET);
1048
    matroska->level_up = level_up;
1049
}
1050

    
1051
static int matroska_aac_profile(char *codec_id)
1052
{
1053
    static const char * const aac_profiles[] = { "MAIN", "LC", "SSR" };
1054
    int profile;
1055

    
1056
    for (profile=0; profile<FF_ARRAY_ELEMS(aac_profiles); profile++)
1057
        if (strstr(codec_id, aac_profiles[profile]))
1058
            break;
1059
    return profile + 1;
1060
}
1061

    
1062
static int matroska_aac_sri(int samplerate)
1063
{
1064
    int sri;
1065

    
1066
    for (sri=0; sri<FF_ARRAY_ELEMS(ff_mpeg4audio_sample_rates); sri++)
1067
        if (ff_mpeg4audio_sample_rates[sri] == samplerate)
1068
            break;
1069
    return sri;
1070
}
1071

    
1072
static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
1073
{
1074
    MatroskaDemuxContext *matroska = s->priv_data;
1075
    EbmlList *attachements_list = &matroska->attachments;
1076
    MatroskaAttachement *attachements;
1077
    EbmlList *chapters_list = &matroska->chapters;
1078
    MatroskaChapter *chapters;
1079
    MatroskaTrack *tracks;
1080
    EbmlList *index_list;
1081
    MatroskaIndex *index;
1082
    int index_scale = 1;
1083
    uint64_t max_start = 0;
1084
    Ebml ebml = { 0 };
1085
    AVStream *st;
1086
    int i, j;
1087

    
1088
    matroska->ctx = s;
1089

    
1090
    /* First read the EBML header. */
1091
    if (ebml_parse(matroska, ebml_syntax, &ebml)
1092
        || ebml.version > EBML_VERSION       || ebml.max_size > sizeof(uint64_t)
1093
        || ebml.id_length > sizeof(uint32_t) || strcmp(ebml.doctype, "matroska")
1094
        || ebml.doctype_version > 2) {
1095
        av_log(matroska->ctx, AV_LOG_ERROR,
1096
               "EBML header using unsupported features\n"
1097
               "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
1098
               ebml.version, ebml.doctype, ebml.doctype_version);
1099
        return AVERROR_NOFMT;
1100
    }
1101
    ebml_free(ebml_syntax, &ebml);
1102

    
1103
    /* The next thing is a segment. */
1104
    if (ebml_parse(matroska, matroska_segments, matroska) < 0)
1105
        return -1;
1106
    matroska_execute_seekhead(matroska);
1107

    
1108
    if (matroska->duration)
1109
        matroska->ctx->duration = matroska->duration * matroska->time_scale
1110
                                  * 1000 / AV_TIME_BASE;
1111
    av_metadata_set(&s->metadata, "title", matroska->title);
1112
    matroska_convert_tags(s, &matroska->tags);
1113

    
1114
    tracks = matroska->tracks.elem;
1115
    for (i=0; i < matroska->tracks.nb_elem; i++) {
1116
        MatroskaTrack *track = &tracks[i];
1117
        enum CodecID codec_id = CODEC_ID_NONE;
1118
        EbmlList *encodings_list = &tracks->encodings;
1119
        MatroskaTrackEncoding *encodings = encodings_list->elem;
1120
        uint8_t *extradata = NULL;
1121
        int extradata_size = 0;
1122
        int extradata_offset = 0;
1123
        ByteIOContext b;
1124

    
1125
        /* Apply some sanity checks. */
1126
        if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1127
            track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1128
            track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1129
            av_log(matroska->ctx, AV_LOG_INFO,
1130
                   "Unknown or unsupported track type %"PRIu64"\n",
1131
                   track->type);
1132
            continue;
1133
        }
1134
        if (track->codec_id == NULL)
1135
            continue;
1136

    
1137
        if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1138
            if (!track->default_duration)
1139
                track->default_duration = 1000000000/track->video.frame_rate;
1140
            if (!track->video.display_width)
1141
                track->video.display_width = track->video.pixel_width;
1142
            if (!track->video.display_height)
1143
                track->video.display_height = track->video.pixel_height;
1144
        } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1145
            if (!track->audio.out_samplerate)
1146
                track->audio.out_samplerate = track->audio.samplerate;
1147
        }
1148
        if (encodings_list->nb_elem > 1) {
1149
            av_log(matroska->ctx, AV_LOG_ERROR,
1150
                   "Multiple combined encodings no supported");
1151
        } else if (encodings_list->nb_elem == 1) {
1152
            if (encodings[0].type ||
1153
                (encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
1154
#if CONFIG_ZLIB
1155
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1156
#endif
1157
#if CONFIG_BZLIB
1158
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1159
#endif
1160
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
1161
                encodings[0].scope = 0;
1162
                av_log(matroska->ctx, AV_LOG_ERROR,
1163
                       "Unsupported encoding type");
1164
            } else if (track->codec_priv.size && encodings[0].scope&2) {
1165
                uint8_t *codec_priv = track->codec_priv.data;
1166
                int offset = matroska_decode_buffer(&track->codec_priv.data,
1167
                                                    &track->codec_priv.size,
1168
                                                    track);
1169
                if (offset < 0) {
1170
                    track->codec_priv.data = NULL;
1171
                    track->codec_priv.size = 0;
1172
                    av_log(matroska->ctx, AV_LOG_ERROR,
1173
                           "Failed to decode codec private data\n");
1174
                } else if (offset > 0) {
1175
                    track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
1176
                    memcpy(track->codec_priv.data,
1177
                           encodings[0].compression.settings.data, offset);
1178
                    memcpy(track->codec_priv.data+offset, codec_priv,
1179
                           track->codec_priv.size);
1180
                    track->codec_priv.size += offset;
1181
                }
1182
                if (codec_priv != track->codec_priv.data)
1183
                    av_free(codec_priv);
1184
            }
1185
        }
1186

    
1187
        for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
1188
            if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1189
                        strlen(ff_mkv_codec_tags[j].str))){
1190
                codec_id= ff_mkv_codec_tags[j].id;
1191
                break;
1192
            }
1193
        }
1194

    
1195
        st = track->stream = av_new_stream(s, 0);
1196
        if (st == NULL)
1197
            return AVERROR(ENOMEM);
1198

    
1199
        if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")
1200
            && track->codec_priv.size >= 40
1201
            && track->codec_priv.data != NULL) {
1202
            track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
1203
            codec_id = codec_get_id(codec_bmp_tags, track->video.fourcc);
1204
        } else if (!strcmp(track->codec_id, "A_MS/ACM")
1205
                   && track->codec_priv.size >= 18
1206
                   && track->codec_priv.data != NULL) {
1207
            init_put_byte(&b, track->codec_priv.data, track->codec_priv.size,
1208
                          URL_RDONLY, NULL, NULL, NULL, NULL);
1209
            get_wav_header(&b, st->codec, track->codec_priv.size);
1210
            codec_id = st->codec->codec_id;
1211
            extradata_offset = 18;
1212
            track->codec_priv.size -= extradata_offset;
1213
        } else if (!strcmp(track->codec_id, "V_QUICKTIME")
1214
                   && (track->codec_priv.size >= 86)
1215
                   && (track->codec_priv.data != NULL)) {
1216
            track->video.fourcc = AV_RL32(track->codec_priv.data);
1217
            codec_id=codec_get_id(codec_movvideo_tags, track->video.fourcc);
1218
        } else if (codec_id == CODEC_ID_PCM_S16BE) {
1219
            switch (track->audio.bitdepth) {
1220
            case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1221
            case 24:  codec_id = CODEC_ID_PCM_S24BE;  break;
1222
            case 32:  codec_id = CODEC_ID_PCM_S32BE;  break;
1223
            }
1224
        } else if (codec_id == CODEC_ID_PCM_S16LE) {
1225
            switch (track->audio.bitdepth) {
1226
            case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1227
            case 24:  codec_id = CODEC_ID_PCM_S24LE;  break;
1228
            case 32:  codec_id = CODEC_ID_PCM_S32LE;  break;
1229
            }
1230
        } else if (codec_id==CODEC_ID_PCM_F32LE && track->audio.bitdepth==64) {
1231
            codec_id = CODEC_ID_PCM_F64LE;
1232
        } else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
1233
            int profile = matroska_aac_profile(track->codec_id);
1234
            int sri = matroska_aac_sri(track->audio.samplerate);
1235
            extradata = av_malloc(5);
1236
            if (extradata == NULL)
1237
                return AVERROR(ENOMEM);
1238
            extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
1239
            extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
1240
            if (strstr(track->codec_id, "SBR")) {
1241
                sri = matroska_aac_sri(track->audio.out_samplerate);
1242
                extradata[2] = 0x56;
1243
                extradata[3] = 0xE5;
1244
                extradata[4] = 0x80 | (sri<<3);
1245
                extradata_size = 5;
1246
            } else
1247
                extradata_size = 2;
1248
        } else if (codec_id == CODEC_ID_TTA) {
1249
            extradata_size = 30;
1250
            extradata = av_mallocz(extradata_size);
1251
            if (extradata == NULL)
1252
                return AVERROR(ENOMEM);
1253
            init_put_byte(&b, extradata, extradata_size, 1,
1254
                          NULL, NULL, NULL, NULL);
1255
            put_buffer(&b, "TTA1", 4);
1256
            put_le16(&b, 1);
1257
            put_le16(&b, track->audio.channels);
1258
            put_le16(&b, track->audio.bitdepth);
1259
            put_le32(&b, track->audio.out_samplerate);
1260
            put_le32(&b, matroska->ctx->duration * track->audio.out_samplerate);
1261
        } else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
1262
                   codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
1263
            extradata_offset = 26;
1264
            track->codec_priv.size -= extradata_offset;
1265
        } else if (codec_id == CODEC_ID_RA_144) {
1266
            track->audio.out_samplerate = 8000;
1267
            track->audio.channels = 1;
1268
        } else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
1269
                   codec_id == CODEC_ID_ATRAC3) {
1270
            init_put_byte(&b, track->codec_priv.data,track->codec_priv.size,
1271
                          0, NULL, NULL, NULL, NULL);
1272
            url_fskip(&b, 24);
1273
            track->audio.coded_framesize = get_be32(&b);
1274
            url_fskip(&b, 12);
1275
            track->audio.sub_packet_h    = get_be16(&b);
1276
            track->audio.frame_size      = get_be16(&b);
1277
            track->audio.sub_packet_size = get_be16(&b);
1278
            track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
1279
            if (codec_id == CODEC_ID_RA_288) {
1280
                st->codec->block_align = track->audio.coded_framesize;
1281
                track->codec_priv.size = 0;
1282
            } else {
1283
                st->codec->block_align = track->audio.sub_packet_size;
1284
                extradata_offset = 78;
1285
                track->codec_priv.size -= extradata_offset;
1286
            }
1287
        }
1288

    
1289
        if (codec_id == CODEC_ID_NONE)
1290
            av_log(matroska->ctx, AV_LOG_INFO,
1291
                   "Unknown/unsupported CodecID %s.\n", track->codec_id);
1292

    
1293
        if (track->time_scale < 0.01)
1294
            track->time_scale = 1.0;
1295
        av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
1296

    
1297
        st->codec->codec_id = codec_id;
1298
        st->start_time = 0;
1299
        if (strcmp(track->language, "und"))
1300
            av_metadata_set(&st->metadata, "language", track->language);
1301
        av_metadata_set(&st->metadata, "description", track->name);
1302

    
1303
        if (track->flag_default)
1304
            st->disposition |= AV_DISPOSITION_DEFAULT;
1305

    
1306
        if (track->default_duration)
1307
            av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
1308
                      track->default_duration, 1000000000, 30000);
1309

    
1310
        if(extradata){
1311
            st->codec->extradata = extradata;
1312
            st->codec->extradata_size = extradata_size;
1313
        } else if(track->codec_priv.data && track->codec_priv.size > 0){
1314
            st->codec->extradata = av_mallocz(track->codec_priv.size +
1315
                                              FF_INPUT_BUFFER_PADDING_SIZE);
1316
            if(st->codec->extradata == NULL)
1317
                return AVERROR(ENOMEM);
1318
            st->codec->extradata_size = track->codec_priv.size;
1319
            memcpy(st->codec->extradata,
1320
                   track->codec_priv.data + extradata_offset,
1321
                   track->codec_priv.size);
1322
        }
1323

    
1324
        if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1325
            st->codec->codec_type = CODEC_TYPE_VIDEO;
1326
            st->codec->codec_tag  = track->video.fourcc;
1327
            st->codec->width  = track->video.pixel_width;
1328
            st->codec->height = track->video.pixel_height;
1329
            av_reduce(&st->sample_aspect_ratio.num,
1330
                      &st->sample_aspect_ratio.den,
1331
                      st->codec->height * track->video.display_width,
1332
                      st->codec-> width * track->video.display_height,
1333
                      255);
1334
            st->need_parsing = AVSTREAM_PARSE_HEADERS;
1335
        } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1336
            st->codec->codec_type = CODEC_TYPE_AUDIO;
1337
            st->codec->sample_rate = track->audio.out_samplerate;
1338
            st->codec->channels = track->audio.channels;
1339
        } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1340
            st->codec->codec_type = CODEC_TYPE_SUBTITLE;
1341
        }
1342
    }
1343

    
1344
    attachements = attachements_list->elem;
1345
    for (j=0; j<attachements_list->nb_elem; j++) {
1346
        if (!(attachements[j].filename && attachements[j].mime &&
1347
              attachements[j].bin.data && attachements[j].bin.size > 0)) {
1348
            av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
1349
        } else {
1350
            AVStream *st = av_new_stream(s, 0);
1351
            if (st == NULL)
1352
                break;
1353
            av_metadata_set(&st->metadata, "filename",attachements[j].filename);
1354
            st->codec->codec_id = CODEC_ID_NONE;
1355
            st->codec->codec_type = CODEC_TYPE_ATTACHMENT;
1356
            st->codec->extradata  = av_malloc(attachements[j].bin.size);
1357
            if(st->codec->extradata == NULL)
1358
                break;
1359
            st->codec->extradata_size = attachements[j].bin.size;
1360
            memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
1361

    
1362
            for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
1363
                if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
1364
                             strlen(ff_mkv_mime_tags[i].str))) {
1365
                    st->codec->codec_id = ff_mkv_mime_tags[i].id;
1366
                    break;
1367
                }
1368
            }
1369
        }
1370
    }
1371

    
1372
    chapters = chapters_list->elem;
1373
    for (i=0; i<chapters_list->nb_elem; i++)
1374
        if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid
1375
            && (max_start==0 || chapters[i].start > max_start)) {
1376
            chapters[i].chapter =
1377
            ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
1378
                           chapters[i].start, chapters[i].end,
1379
                           chapters[i].title);
1380
            av_metadata_set(&chapters[i].chapter->metadata,
1381
                            "title", chapters[i].title);
1382
            max_start = chapters[i].start;
1383
        }
1384

    
1385
    index_list = &matroska->index;
1386
    index = index_list->elem;
1387
    if (index_list->nb_elem
1388
        && index[0].time > 100000000000000/matroska->time_scale) {
1389
        av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
1390
        index_scale = matroska->time_scale;
1391
    }
1392
    for (i=0; i<index_list->nb_elem; i++) {
1393
        EbmlList *pos_list = &index[i].pos;
1394
        MatroskaIndexPos *pos = pos_list->elem;
1395
        for (j=0; j<pos_list->nb_elem; j++) {
1396
            MatroskaTrack *track = matroska_find_track_by_num(matroska,
1397
                                                              pos[j].track);
1398
            if (track && track->stream)
1399
                av_add_index_entry(track->stream,
1400
                                   pos[j].pos + matroska->segment_start,
1401
                                   index[i].time/index_scale, 0, 0,
1402
                                   AVINDEX_KEYFRAME);
1403
        }
1404
    }
1405

    
1406
    return 0;
1407
}
1408

    
1409
/*
1410
 * Put one packet in an application-supplied AVPacket struct.
1411
 * Returns 0 on success or -1 on failure.
1412
 */
1413
static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
1414
                                   AVPacket *pkt)
1415
{
1416
    if (matroska->num_packets > 0) {
1417
        memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
1418
        av_free(matroska->packets[0]);
1419
        if (matroska->num_packets > 1) {
1420
            memmove(&matroska->packets[0], &matroska->packets[1],
1421
                    (matroska->num_packets - 1) * sizeof(AVPacket *));
1422
            matroska->packets =
1423
                av_realloc(matroska->packets, (matroska->num_packets - 1) *
1424
                           sizeof(AVPacket *));
1425
        } else {
1426
            av_freep(&matroska->packets);
1427
        }
1428
        matroska->num_packets--;
1429
        return 0;
1430
    }
1431

    
1432
    return -1;
1433
}
1434

    
1435
/*
1436
 * Free all packets in our internal queue.
1437
 */
1438
static void matroska_clear_queue(MatroskaDemuxContext *matroska)
1439
{
1440
    if (matroska->packets) {
1441
        int n;
1442
        for (n = 0; n < matroska->num_packets; n++) {
1443
            av_free_packet(matroska->packets[n]);
1444
            av_free(matroska->packets[n]);
1445
        }
1446
        av_freep(&matroska->packets);
1447
        matroska->num_packets = 0;
1448
    }
1449
}
1450

    
1451
static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
1452
                                int size, int64_t pos, uint64_t cluster_time,
1453
                                uint64_t duration, int is_keyframe,
1454
                                int64_t cluster_pos)
1455
{
1456
    uint64_t timecode = AV_NOPTS_VALUE;
1457
    MatroskaTrack *track;
1458
    int res = 0;
1459
    AVStream *st;
1460
    AVPacket *pkt;
1461
    int16_t block_time;
1462
    uint32_t *lace_size = NULL;
1463
    int n, flags, laces = 0;
1464
    uint64_t num;
1465

    
1466
    if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
1467
        av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
1468
        return res;
1469
    }
1470
    data += n;
1471
    size -= n;
1472

    
1473
    track = matroska_find_track_by_num(matroska, num);
1474
    if (size <= 3 || !track || !track->stream) {
1475
        av_log(matroska->ctx, AV_LOG_INFO,
1476
               "Invalid stream %"PRIu64" or size %u\n", num, size);
1477
        return res;
1478
    }
1479
    st = track->stream;
1480
    if (st->discard >= AVDISCARD_ALL)
1481
        return res;
1482
    if (duration == AV_NOPTS_VALUE)
1483
        duration = track->default_duration / matroska->time_scale;
1484

    
1485
    block_time = AV_RB16(data);
1486
    data += 2;
1487
    flags = *data++;
1488
    size -= 3;
1489
    if (is_keyframe == -1)
1490
        is_keyframe = flags & 0x80 ? PKT_FLAG_KEY : 0;
1491

    
1492
    if (cluster_time != (uint64_t)-1
1493
        && (block_time >= 0 || cluster_time >= -block_time)) {
1494
        timecode = cluster_time + block_time;
1495
        if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE
1496
            && timecode < track->end_timecode)
1497
            is_keyframe = 0;  /* overlapping subtitles are not key frame */
1498
        if (is_keyframe)
1499
            av_add_index_entry(st, cluster_pos, timecode, 0,0,AVINDEX_KEYFRAME);
1500
        track->end_timecode = FFMAX(track->end_timecode, timecode+duration);
1501
    }
1502

    
1503
    if (matroska->skip_to_keyframe && track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1504
        if (!is_keyframe || timecode < matroska->skip_to_timecode)
1505
            return res;
1506
        matroska->skip_to_keyframe = 0;
1507
    }
1508

    
1509
    switch ((flags & 0x06) >> 1) {
1510
        case 0x0: /* no lacing */
1511
            laces = 1;
1512
            lace_size = av_mallocz(sizeof(int));
1513
            lace_size[0] = size;
1514
            break;
1515

    
1516
        case 0x1: /* Xiph lacing */
1517
        case 0x2: /* fixed-size lacing */
1518
        case 0x3: /* EBML lacing */
1519
            assert(size>0); // size <=3 is checked before size-=3 above
1520
            laces = (*data) + 1;
1521
            data += 1;
1522
            size -= 1;
1523
            lace_size = av_mallocz(laces * sizeof(int));
1524

    
1525
            switch ((flags & 0x06) >> 1) {
1526
                case 0x1: /* Xiph lacing */ {
1527
                    uint8_t temp;
1528
                    uint32_t total = 0;
1529
                    for (n = 0; res == 0 && n < laces - 1; n++) {
1530
                        while (1) {
1531
                            if (size == 0) {
1532
                                res = -1;
1533
                                break;
1534
                            }
1535
                            temp = *data;
1536
                            lace_size[n] += temp;
1537
                            data += 1;
1538
                            size -= 1;
1539
                            if (temp != 0xff)
1540
                                break;
1541
                        }
1542
                        total += lace_size[n];
1543
                    }
1544
                    lace_size[n] = size - total;
1545
                    break;
1546
                }
1547

    
1548
                case 0x2: /* fixed-size lacing */
1549
                    for (n = 0; n < laces; n++)
1550
                        lace_size[n] = size / laces;
1551
                    break;
1552

    
1553
                case 0x3: /* EBML lacing */ {
1554
                    uint32_t total;
1555
                    n = matroska_ebmlnum_uint(matroska, data, size, &num);
1556
                    if (n < 0) {
1557
                        av_log(matroska->ctx, AV_LOG_INFO,
1558
                               "EBML block data error\n");
1559
                        break;
1560
                    }
1561
                    data += n;
1562
                    size -= n;
1563
                    total = lace_size[0] = num;
1564
                    for (n = 1; res == 0 && n < laces - 1; n++) {
1565
                        int64_t snum;
1566
                        int r;
1567
                        r = matroska_ebmlnum_sint(matroska, data, size, &snum);
1568
                        if (r < 0) {
1569
                            av_log(matroska->ctx, AV_LOG_INFO,
1570
                                   "EBML block data error\n");
1571
                            break;
1572
                        }
1573
                        data += r;
1574
                        size -= r;
1575
                        lace_size[n] = lace_size[n - 1] + snum;
1576
                        total += lace_size[n];
1577
                    }
1578
                    lace_size[n] = size - total;
1579
                    break;
1580
                }
1581
            }
1582
            break;
1583
    }
1584

    
1585
    if (res == 0) {
1586
        for (n = 0; n < laces; n++) {
1587
            if (st->codec->codec_id == CODEC_ID_RA_288 ||
1588
                st->codec->codec_id == CODEC_ID_COOK ||
1589
                st->codec->codec_id == CODEC_ID_ATRAC3) {
1590
                int a = st->codec->block_align;
1591
                int sps = track->audio.sub_packet_size;
1592
                int cfs = track->audio.coded_framesize;
1593
                int h = track->audio.sub_packet_h;
1594
                int y = track->audio.sub_packet_cnt;
1595
                int w = track->audio.frame_size;
1596
                int x;
1597

    
1598
                if (!track->audio.pkt_cnt) {
1599
                    if (st->codec->codec_id == CODEC_ID_RA_288)
1600
                        for (x=0; x<h/2; x++)
1601
                            memcpy(track->audio.buf+x*2*w+y*cfs,
1602
                                   data+x*cfs, cfs);
1603
                    else
1604
                        for (x=0; x<w/sps; x++)
1605
                            memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
1606

    
1607
                    if (++track->audio.sub_packet_cnt >= h) {
1608
                        track->audio.sub_packet_cnt = 0;
1609
                        track->audio.pkt_cnt = h*w / a;
1610
                    }
1611
                }
1612
                while (track->audio.pkt_cnt) {
1613
                    pkt = av_mallocz(sizeof(AVPacket));
1614
                    av_new_packet(pkt, a);
1615
                    memcpy(pkt->data, track->audio.buf
1616
                           + a * (h*w / a - track->audio.pkt_cnt--), a);
1617
                    pkt->pos = pos;
1618
                    pkt->stream_index = st->index;
1619
                    dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1620
                }
1621
            } else {
1622
                MatroskaTrackEncoding *encodings = track->encodings.elem;
1623
                int offset = 0, pkt_size = lace_size[n];
1624
                uint8_t *pkt_data = data;
1625

    
1626
                if (encodings && encodings->scope & 1) {
1627
                    offset = matroska_decode_buffer(&pkt_data,&pkt_size, track);
1628
                    if (offset < 0)
1629
                        continue;
1630
                }
1631

    
1632
                pkt = av_mallocz(sizeof(AVPacket));
1633
                /* XXX: prevent data copy... */
1634
                if (av_new_packet(pkt, pkt_size+offset) < 0) {
1635
                    av_free(pkt);
1636
                    res = AVERROR(ENOMEM);
1637
                    n = laces-1;
1638
                    break;
1639
                }
1640
                if (offset)
1641
                    memcpy (pkt->data, encodings->compression.settings.data, offset);
1642
                memcpy (pkt->data+offset, pkt_data, pkt_size);
1643

    
1644
                if (pkt_data != data)
1645
                    av_free(pkt_data);
1646

    
1647
                if (n == 0)
1648
                    pkt->flags = is_keyframe;
1649
                pkt->stream_index = st->index;
1650

    
1651
                pkt->pts = timecode;
1652
                pkt->pos = pos;
1653
                if (st->codec->codec_id == CODEC_ID_TEXT)
1654
                    pkt->convergence_duration = duration;
1655
                else if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE)
1656
                    pkt->duration = duration;
1657

    
1658
                if (st->codec->codec_id == CODEC_ID_SSA)
1659
                    matroska_fix_ass_packet(matroska, pkt, duration);
1660

    
1661
                if (matroska->prev_pkt &&
1662
                    timecode != AV_NOPTS_VALUE &&
1663
                    matroska->prev_pkt->pts == timecode &&
1664
                    matroska->prev_pkt->stream_index == st->index)
1665
                    matroska_merge_packets(matroska->prev_pkt, pkt);
1666
                else {
1667
                    dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1668
                    matroska->prev_pkt = pkt;
1669
                }
1670
            }
1671

    
1672
            if (timecode != AV_NOPTS_VALUE)
1673
                timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
1674
            data += lace_size[n];
1675
        }
1676
    }
1677

    
1678
    av_free(lace_size);
1679
    return res;
1680
}
1681

    
1682
static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
1683
{
1684
    MatroskaCluster cluster = { 0 };
1685
    EbmlList *blocks_list;
1686
    MatroskaBlock *blocks;
1687
    int i, res;
1688
    int64_t pos = url_ftell(matroska->ctx->pb);
1689
    matroska->prev_pkt = NULL;
1690
    if (matroska->has_cluster_id){
1691
        /* For the first cluster we parse, its ID was already read as
1692
           part of matroska_read_header(), so don't read it again */
1693
        res = ebml_parse_id(matroska, matroska_clusters,
1694
                            MATROSKA_ID_CLUSTER, &cluster);
1695
        pos -= 4;  /* sizeof the ID which was already read */
1696
        matroska->has_cluster_id = 0;
1697
    } else
1698
        res = ebml_parse(matroska, matroska_clusters, &cluster);
1699
    blocks_list = &cluster.blocks;
1700
    blocks = blocks_list->elem;
1701
    for (i=0; i<blocks_list->nb_elem; i++)
1702
        if (blocks[i].bin.size > 0)
1703
            res=matroska_parse_block(matroska,
1704
                                     blocks[i].bin.data, blocks[i].bin.size,
1705
                                     blocks[i].bin.pos,  cluster.timecode,
1706
                                     blocks[i].duration, !blocks[i].reference,
1707
                                     pos);
1708
    ebml_free(matroska_cluster, &cluster);
1709
    if (res < 0)  matroska->done = 1;
1710
    return res;
1711
}
1712

    
1713
static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
1714
{
1715
    MatroskaDemuxContext *matroska = s->priv_data;
1716

    
1717
    while (matroska_deliver_packet(matroska, pkt)) {
1718
        if (matroska->done)
1719
            return AVERROR(EIO);
1720
        matroska_parse_cluster(matroska);
1721
    }
1722

    
1723
    return 0;
1724
}
1725

    
1726
static int matroska_read_seek(AVFormatContext *s, int stream_index,
1727
                              int64_t timestamp, int flags)
1728
{
1729
    MatroskaDemuxContext *matroska = s->priv_data;
1730
    MatroskaTrack *tracks = matroska->tracks.elem;
1731
    AVStream *st = s->streams[stream_index];
1732
    int i, index, index_sub, index_min;
1733

    
1734
    if (!st->nb_index_entries)
1735
        return 0;
1736
    timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
1737

    
1738
    if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1739
        url_fseek(s->pb, st->index_entries[st->nb_index_entries-1].pos, SEEK_SET);
1740
        while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1741
            matroska_clear_queue(matroska);
1742
            if (matroska_parse_cluster(matroska) < 0)
1743
                break;
1744
        }
1745
    }
1746

    
1747
    matroska_clear_queue(matroska);
1748
    if (index < 0)
1749
        return 0;
1750

    
1751
    index_min = index;
1752
    for (i=0; i < matroska->tracks.nb_elem; i++) {
1753
        tracks[i].end_timecode = 0;
1754
        if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE
1755
            && !tracks[i].stream->discard != AVDISCARD_ALL) {
1756
            index_sub = av_index_search_timestamp(tracks[i].stream, st->index_entries[index].timestamp, AVSEEK_FLAG_BACKWARD);
1757
            if (index_sub >= 0
1758
                && st->index_entries[index_sub].pos < st->index_entries[index_min].pos
1759
                && st->index_entries[index].timestamp - st->index_entries[index_sub].timestamp < 30000000000/matroska->time_scale)
1760
                index_min = index_sub;
1761
        }
1762
    }
1763

    
1764
    url_fseek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
1765
    matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
1766
    matroska->skip_to_timecode = st->index_entries[index].timestamp;
1767
    matroska->done = 0;
1768
    av_update_cur_dts(s, st, st->index_entries[index].timestamp);
1769
    return 0;
1770
}
1771

    
1772
static int matroska_read_close(AVFormatContext *s)
1773
{
1774
    MatroskaDemuxContext *matroska = s->priv_data;
1775
    MatroskaTrack *tracks = matroska->tracks.elem;
1776
    int n;
1777

    
1778
    matroska_clear_queue(matroska);
1779

    
1780
    for (n=0; n < matroska->tracks.nb_elem; n++)
1781
        if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
1782
            av_free(tracks[n].audio.buf);
1783
    ebml_free(matroska_segment, matroska);
1784

    
1785
    return 0;
1786
}
1787

    
1788
AVInputFormat matroska_demuxer = {
1789
    "matroska",
1790
    NULL_IF_CONFIG_SMALL("Matroska file format"),
1791
    sizeof(MatroskaDemuxContext),
1792
    matroska_probe,
1793
    matroska_read_header,
1794
    matroska_read_packet,
1795
    matroska_read_close,
1796
    matroska_read_seek,
1797
};