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ffmpeg / libavformat / matroskadec.c @ 3e93c8ed

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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 ff_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;
73

    
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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

    
93
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;
103

    
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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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    int ms_compat;
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} MatroskaTrack;
148

    
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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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    AVStream *stream;
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} MatroskaAttachement;
157

    
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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;
166

    
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typedef struct {
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    uint64_t track;
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    uint64_t pos;
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} MatroskaIndexPos;
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typedef struct {
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    uint64_t time;
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    EbmlList pos;
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} MatroskaIndex;
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typedef struct {
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    char *name;
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    char *string;
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    char *lang;
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    uint64_t def;
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    EbmlList sub;
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} MatroskaTag;
184

    
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typedef struct {
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    char    *type;
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    uint64_t typevalue;
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    uint64_t trackuid;
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    uint64_t chapteruid;
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    uint64_t attachuid;
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} MatroskaTagTarget;
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typedef struct {
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    MatroskaTagTarget target;
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    EbmlList tag;
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} MatroskaTags;
197

    
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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;
207

    
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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;
228

    
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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;
233

    
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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;
241

    
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typedef struct {
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    uint64_t duration;
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    int64_t  reference;
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    uint64_t non_simple;
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    EbmlBin  bin;
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} MatroskaBlock;
248

    
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typedef struct {
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    uint64_t timecode;
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    EbmlList blocks;
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} MatroskaCluster;
253

    
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static EbmlSyntax ebml_header[] = {
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    { EBML_ID_EBMLREADVERSION,        EBML_UINT, 0, offsetof(Ebml,version), {.u=EBML_VERSION} },
256
    { EBML_ID_EBMLMAXSIZELENGTH,      EBML_UINT, 0, offsetof(Ebml,max_size), {.u=8} },
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    { EBML_ID_EBMLMAXIDLENGTH,        EBML_UINT, 0, offsetof(Ebml,id_length), {.u=4} },
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    { EBML_ID_DOCTYPE,                EBML_STR,  0, offsetof(Ebml,doctype), {.s="(none)"} },
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    { EBML_ID_DOCTYPEREADVERSION,     EBML_UINT, 0, offsetof(Ebml,doctype_version), {.u=1} },
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    { EBML_ID_EBMLVERSION,            EBML_NONE },
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    { EBML_ID_DOCTYPEVERSION,         EBML_NONE },
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    { 0 }
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};
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static EbmlSyntax ebml_syntax[] = {
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    { EBML_ID_HEADER,                 EBML_NEST, 0, 0, {.n=ebml_header} },
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    { 0 }
268
};
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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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};
280

    
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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) },
288
    { MATROSKA_ID_VIDEOPIXELCROPB,    EBML_NONE },
289
    { MATROSKA_ID_VIDEOPIXELCROPT,    EBML_NONE },
290
    { MATROSKA_ID_VIDEOPIXELCROPL,    EBML_NONE },
291
    { MATROSKA_ID_VIDEOPIXELCROPR,    EBML_NONE },
292
    { MATROSKA_ID_VIDEODISPLAYUNIT,   EBML_NONE },
293
    { MATROSKA_ID_VIDEOFLAGINTERLACED,EBML_NONE },
294
    { MATROSKA_ID_VIDEOSTEREOMODE,    EBML_NONE },
295
    { MATROSKA_ID_VIDEOASPECTRATIO,   EBML_NONE },
296
    { 0 }
297
};
298

    
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static EbmlSyntax matroska_track_audio[] = {
300
    { MATROSKA_ID_AUDIOSAMPLINGFREQ,  EBML_FLOAT,0, offsetof(MatroskaTrackAudio,samplerate), {.f=8000.0} },
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    { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ,EBML_FLOAT,0,offsetof(MatroskaTrackAudio,out_samplerate) },
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    { MATROSKA_ID_AUDIOBITDEPTH,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,bitdepth) },
303
    { MATROSKA_ID_AUDIOCHANNELS,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,channels), {.u=1} },
304
    { 0 }
305
};
306

    
307
static EbmlSyntax matroska_track_encoding_compression[] = {
308
    { MATROSKA_ID_ENCODINGCOMPALGO,   EBML_UINT, 0, offsetof(MatroskaTrackCompression,algo), {.u=0} },
309
    { MATROSKA_ID_ENCODINGCOMPSETTINGS,EBML_BIN, 0, offsetof(MatroskaTrackCompression,settings) },
310
    { 0 }
311
};
312

    
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static EbmlSyntax matroska_track_encoding[] = {
314
    { MATROSKA_ID_ENCODINGSCOPE,      EBML_UINT, 0, offsetof(MatroskaTrackEncoding,scope), {.u=1} },
315
    { MATROSKA_ID_ENCODINGTYPE,       EBML_UINT, 0, offsetof(MatroskaTrackEncoding,type), {.u=0} },
316
    { MATROSKA_ID_ENCODINGCOMPRESSION,EBML_NEST, 0, offsetof(MatroskaTrackEncoding,compression), {.n=matroska_track_encoding_compression} },
317
    { MATROSKA_ID_ENCODINGORDER,      EBML_NONE },
318
    { 0 }
319
};
320

    
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static EbmlSyntax matroska_track_encodings[] = {
322
    { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack,encodings), {.n=matroska_track_encoding} },
323
    { 0 }
324
};
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static EbmlSyntax matroska_track[] = {
327
    { MATROSKA_ID_TRACKNUMBER,          EBML_UINT, 0, offsetof(MatroskaTrack,num) },
328
    { MATROSKA_ID_TRACKNAME,            EBML_UTF8, 0, offsetof(MatroskaTrack,name) },
329
    { MATROSKA_ID_TRACKUID,             EBML_UINT, 0, offsetof(MatroskaTrack,uid) },
330
    { MATROSKA_ID_TRACKTYPE,            EBML_UINT, 0, offsetof(MatroskaTrack,type) },
331
    { MATROSKA_ID_CODECID,              EBML_STR,  0, offsetof(MatroskaTrack,codec_id) },
332
    { MATROSKA_ID_CODECPRIVATE,         EBML_BIN,  0, offsetof(MatroskaTrack,codec_priv) },
333
    { MATROSKA_ID_TRACKLANGUAGE,        EBML_UTF8, 0, offsetof(MatroskaTrack,language), {.s="eng"} },
334
    { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack,default_duration) },
335
    { MATROSKA_ID_TRACKTIMECODESCALE,   EBML_FLOAT,0, offsetof(MatroskaTrack,time_scale), {.f=1.0} },
336
    { MATROSKA_ID_TRACKFLAGDEFAULT,     EBML_UINT, 0, offsetof(MatroskaTrack,flag_default), {.u=1} },
337
    { MATROSKA_ID_TRACKVIDEO,           EBML_NEST, 0, offsetof(MatroskaTrack,video), {.n=matroska_track_video} },
338
    { MATROSKA_ID_TRACKAUDIO,           EBML_NEST, 0, offsetof(MatroskaTrack,audio), {.n=matroska_track_audio} },
339
    { MATROSKA_ID_TRACKCONTENTENCODINGS,EBML_NEST, 0, 0, {.n=matroska_track_encodings} },
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    { MATROSKA_ID_TRACKFLAGENABLED,     EBML_NONE },
341
    { MATROSKA_ID_TRACKFLAGFORCED,      EBML_NONE },
342
    { MATROSKA_ID_TRACKFLAGLACING,      EBML_NONE },
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    { MATROSKA_ID_CODECNAME,            EBML_NONE },
344
    { MATROSKA_ID_CODECDECODEALL,       EBML_NONE },
345
    { MATROSKA_ID_CODECINFOURL,         EBML_NONE },
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    { MATROSKA_ID_CODECDOWNLOADURL,     EBML_NONE },
347
    { MATROSKA_ID_TRACKMINCACHE,        EBML_NONE },
348
    { MATROSKA_ID_TRACKMAXCACHE,        EBML_NONE },
349
    { MATROSKA_ID_TRACKMAXBLKADDID,     EBML_NONE },
350
    { 0 }
351
};
352

    
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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} },
355
    { 0 }
356
};
357

    
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static EbmlSyntax matroska_attachment[] = {
359
    { MATROSKA_ID_FILEUID,            EBML_UINT, 0, offsetof(MatroskaAttachement,uid) },
360
    { MATROSKA_ID_FILENAME,           EBML_UTF8, 0, offsetof(MatroskaAttachement,filename) },
361
    { MATROSKA_ID_FILEMIMETYPE,       EBML_STR,  0, offsetof(MatroskaAttachement,mime) },
362
    { MATROSKA_ID_FILEDATA,           EBML_BIN,  0, offsetof(MatroskaAttachement,bin) },
363
    { MATROSKA_ID_FILEDESC,           EBML_NONE },
364
    { 0 }
365
};
366

    
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static EbmlSyntax matroska_attachments[] = {
368
    { MATROSKA_ID_ATTACHEDFILE,       EBML_NEST, sizeof(MatroskaAttachement), offsetof(MatroskaDemuxContext,attachments), {.n=matroska_attachment} },
369
    { 0 }
370
};
371

    
372
static EbmlSyntax matroska_chapter_display[] = {
373
    { MATROSKA_ID_CHAPSTRING,         EBML_UTF8, 0, offsetof(MatroskaChapter,title) },
374
    { MATROSKA_ID_CHAPLANG,           EBML_NONE },
375
    { 0 }
376
};
377

    
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static EbmlSyntax matroska_chapter_entry[] = {
379
    { MATROSKA_ID_CHAPTERTIMESTART,   EBML_UINT, 0, offsetof(MatroskaChapter,start), {.u=AV_NOPTS_VALUE} },
380
    { MATROSKA_ID_CHAPTERTIMEEND,     EBML_UINT, 0, offsetof(MatroskaChapter,end), {.u=AV_NOPTS_VALUE} },
381
    { MATROSKA_ID_CHAPTERUID,         EBML_UINT, 0, offsetof(MatroskaChapter,uid) },
382
    { MATROSKA_ID_CHAPTERDISPLAY,     EBML_NEST, 0, 0, {.n=matroska_chapter_display} },
383
    { MATROSKA_ID_CHAPTERFLAGHIDDEN,  EBML_NONE },
384
    { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
385
    { MATROSKA_ID_CHAPTERPHYSEQUIV,   EBML_NONE },
386
    { MATROSKA_ID_CHAPTERATOM,        EBML_NONE },
387
    { 0 }
388
};
389

    
390
static EbmlSyntax matroska_chapter[] = {
391
    { MATROSKA_ID_CHAPTERATOM,        EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext,chapters), {.n=matroska_chapter_entry} },
392
    { MATROSKA_ID_EDITIONUID,         EBML_NONE },
393
    { MATROSKA_ID_EDITIONFLAGHIDDEN,  EBML_NONE },
394
    { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
395
    { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
396
    { 0 }
397
};
398

    
399
static EbmlSyntax matroska_chapters[] = {
400
    { MATROSKA_ID_EDITIONENTRY,       EBML_NEST, 0, 0, {.n=matroska_chapter} },
401
    { 0 }
402
};
403

    
404
static EbmlSyntax matroska_index_pos[] = {
405
    { MATROSKA_ID_CUETRACK,           EBML_UINT, 0, offsetof(MatroskaIndexPos,track) },
406
    { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos,pos)   },
407
    { MATROSKA_ID_CUEBLOCKNUMBER,     EBML_NONE },
408
    { 0 }
409
};
410

    
411
static EbmlSyntax matroska_index_entry[] = {
412
    { MATROSKA_ID_CUETIME,            EBML_UINT, 0, offsetof(MatroskaIndex,time) },
413
    { MATROSKA_ID_CUETRACKPOSITION,   EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex,pos), {.n=matroska_index_pos} },
414
    { 0 }
415
};
416

    
417
static EbmlSyntax matroska_index[] = {
418
    { MATROSKA_ID_POINTENTRY,         EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext,index), {.n=matroska_index_entry} },
419
    { 0 }
420
};
421

    
422
static EbmlSyntax matroska_simpletag[] = {
423
    { MATROSKA_ID_TAGNAME,            EBML_UTF8, 0, offsetof(MatroskaTag,name) },
424
    { MATROSKA_ID_TAGSTRING,          EBML_UTF8, 0, offsetof(MatroskaTag,string) },
425
    { MATROSKA_ID_TAGLANG,            EBML_STR,  0, offsetof(MatroskaTag,lang), {.s="und"} },
426
    { MATROSKA_ID_TAGDEFAULT,         EBML_UINT, 0, offsetof(MatroskaTag,def) },
427
    { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag,sub), {.n=matroska_simpletag} },
428
    { 0 }
429
};
430

    
431
static EbmlSyntax matroska_tagtargets[] = {
432
    { MATROSKA_ID_TAGTARGETS_TYPE,      EBML_STR,  0, offsetof(MatroskaTagTarget,type) },
433
    { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget,typevalue), {.u=50} },
434
    { MATROSKA_ID_TAGTARGETS_TRACKUID,  EBML_UINT, 0, offsetof(MatroskaTagTarget,trackuid) },
435
    { MATROSKA_ID_TAGTARGETS_CHAPTERUID,EBML_UINT, 0, offsetof(MatroskaTagTarget,chapteruid) },
436
    { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget,attachuid) },
437
    { 0 }
438
};
439

    
440
static EbmlSyntax matroska_tag[] = {
441
    { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags,tag), {.n=matroska_simpletag} },
442
    { MATROSKA_ID_TAGTARGETS,         EBML_NEST, 0, offsetof(MatroskaTags,target), {.n=matroska_tagtargets} },
443
    { 0 }
444
};
445

    
446
static EbmlSyntax matroska_tags[] = {
447
    { MATROSKA_ID_TAG,                EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext,tags), {.n=matroska_tag} },
448
    { 0 }
449
};
450

    
451
static EbmlSyntax matroska_seekhead_entry[] = {
452
    { MATROSKA_ID_SEEKID,             EBML_UINT, 0, offsetof(MatroskaSeekhead,id) },
453
    { MATROSKA_ID_SEEKPOSITION,       EBML_UINT, 0, offsetof(MatroskaSeekhead,pos), {.u=-1} },
454
    { 0 }
455
};
456

    
457
static EbmlSyntax matroska_seekhead[] = {
458
    { MATROSKA_ID_SEEKENTRY,          EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext,seekhead), {.n=matroska_seekhead_entry} },
459
    { 0 }
460
};
461

    
462
static EbmlSyntax matroska_segment[] = {
463
    { MATROSKA_ID_INFO,           EBML_NEST, 0, 0, {.n=matroska_info       } },
464
    { MATROSKA_ID_TRACKS,         EBML_NEST, 0, 0, {.n=matroska_tracks     } },
465
    { MATROSKA_ID_ATTACHMENTS,    EBML_NEST, 0, 0, {.n=matroska_attachments} },
466
    { MATROSKA_ID_CHAPTERS,       EBML_NEST, 0, 0, {.n=matroska_chapters   } },
467
    { MATROSKA_ID_CUES,           EBML_NEST, 0, 0, {.n=matroska_index      } },
468
    { MATROSKA_ID_TAGS,           EBML_NEST, 0, 0, {.n=matroska_tags       } },
469
    { MATROSKA_ID_SEEKHEAD,       EBML_NEST, 0, 0, {.n=matroska_seekhead   } },
470
    { MATROSKA_ID_CLUSTER,        EBML_STOP, 0, offsetof(MatroskaDemuxContext,has_cluster_id) },
471
    { 0 }
472
};
473

    
474
static EbmlSyntax matroska_segments[] = {
475
    { MATROSKA_ID_SEGMENT,        EBML_NEST, 0, 0, {.n=matroska_segment    } },
476
    { 0 }
477
};
478

    
479
static EbmlSyntax matroska_blockgroup[] = {
480
    { MATROSKA_ID_BLOCK,          EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
481
    { MATROSKA_ID_SIMPLEBLOCK,    EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
482
    { MATROSKA_ID_BLOCKDURATION,  EBML_UINT, 0, offsetof(MatroskaBlock,duration), {.u=AV_NOPTS_VALUE} },
483
    { MATROSKA_ID_BLOCKREFERENCE, EBML_UINT, 0, offsetof(MatroskaBlock,reference) },
484
    { 1,                          EBML_UINT, 0, offsetof(MatroskaBlock,non_simple), {.u=1} },
485
    { 0 }
486
};
487

    
488
static EbmlSyntax matroska_cluster[] = {
489
    { MATROSKA_ID_CLUSTERTIMECODE,EBML_UINT,0, offsetof(MatroskaCluster,timecode) },
490
    { MATROSKA_ID_BLOCKGROUP,     EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
491
    { MATROSKA_ID_SIMPLEBLOCK,    EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
492
    { MATROSKA_ID_CLUSTERPOSITION,EBML_NONE },
493
    { MATROSKA_ID_CLUSTERPREVSIZE,EBML_NONE },
494
    { 0 }
495
};
496

    
497
static EbmlSyntax matroska_clusters[] = {
498
    { MATROSKA_ID_CLUSTER,        EBML_NEST, 0, 0, {.n=matroska_cluster} },
499
    { MATROSKA_ID_INFO,           EBML_NONE },
500
    { MATROSKA_ID_CUES,           EBML_NONE },
501
    { MATROSKA_ID_TAGS,           EBML_NONE },
502
    { MATROSKA_ID_SEEKHEAD,       EBML_NONE },
503
    { 0 }
504
};
505

    
506
/*
507
 * Return: Whether we reached the end of a level in the hierarchy or not.
508
 */
509
static int ebml_level_end(MatroskaDemuxContext *matroska)
510
{
511
    ByteIOContext *pb = matroska->ctx->pb;
512
    int64_t pos = url_ftell(pb);
513

    
514
    if (matroska->num_levels > 0) {
515
        MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
516
        if (pos - level->start >= level->length) {
517
            matroska->num_levels--;
518
            return 1;
519
        }
520
    }
521
    return 0;
522
}
523

    
524
/*
525
 * Read: an "EBML number", which is defined as a variable-length
526
 * array of bytes. The first byte indicates the length by giving a
527
 * number of 0-bits followed by a one. The position of the first
528
 * "one" bit inside the first byte indicates the length of this
529
 * number.
530
 * Returns: number of bytes read, < 0 on error
531
 */
532
static int ebml_read_num(MatroskaDemuxContext *matroska, ByteIOContext *pb,
533
                         int max_size, uint64_t *number)
534
{
535
    int len_mask = 0x80, read = 1, n = 1;
536
    int64_t total = 0;
537

    
538
    /* The first byte tells us the length in bytes - get_byte() can normally
539
     * return 0, but since that's not a valid first ebmlID byte, we can
540
     * use it safely here to catch EOS. */
541
    if (!(total = get_byte(pb))) {
542
        /* we might encounter EOS here */
543
        if (!url_feof(pb)) {
544
            int64_t pos = url_ftell(pb);
545
            av_log(matroska->ctx, AV_LOG_ERROR,
546
                   "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
547
                   pos, pos);
548
        }
549
        return AVERROR(EIO); /* EOS or actual I/O error */
550
    }
551

    
552
    /* get the length of the EBML number */
553
    while (read <= max_size && !(total & len_mask)) {
554
        read++;
555
        len_mask >>= 1;
556
    }
557
    if (read > max_size) {
558
        int64_t pos = url_ftell(pb) - 1;
559
        av_log(matroska->ctx, AV_LOG_ERROR,
560
               "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
561
               (uint8_t) total, pos, pos);
562
        return AVERROR_INVALIDDATA;
563
    }
564

    
565
    /* read out length */
566
    total &= ~len_mask;
567
    while (n++ < read)
568
        total = (total << 8) | get_byte(pb);
569

    
570
    *number = total;
571

    
572
    return read;
573
}
574

    
575
/*
576
 * Read the next element as an unsigned int.
577
 * 0 is success, < 0 is failure.
578
 */
579
static int ebml_read_uint(ByteIOContext *pb, int size, uint64_t *num)
580
{
581
    int n = 0;
582

    
583
    if (size < 1 || size > 8)
584
        return AVERROR_INVALIDDATA;
585

    
586
    /* big-endian ordering; build up number */
587
    *num = 0;
588
    while (n++ < size)
589
        *num = (*num << 8) | get_byte(pb);
590

    
591
    return 0;
592
}
593

    
594
/*
595
 * Read the next element as a float.
596
 * 0 is success, < 0 is failure.
597
 */
598
static int ebml_read_float(ByteIOContext *pb, int size, double *num)
599
{
600
    if (size == 4) {
601
        *num= av_int2flt(get_be32(pb));
602
    } else if(size==8){
603
        *num= av_int2dbl(get_be64(pb));
604
    } else
605
        return AVERROR_INVALIDDATA;
606

    
607
    return 0;
608
}
609

    
610
/*
611
 * Read the next element as an ASCII string.
612
 * 0 is success, < 0 is failure.
613
 */
614
static int ebml_read_ascii(ByteIOContext *pb, int size, char **str)
615
{
616
    av_free(*str);
617
    /* EBML strings are usually not 0-terminated, so we allocate one
618
     * byte more, read the string and NULL-terminate it ourselves. */
619
    if (!(*str = av_malloc(size + 1)))
620
        return AVERROR(ENOMEM);
621
    if (get_buffer(pb, (uint8_t *) *str, size) != size) {
622
        av_free(*str);
623
        return AVERROR(EIO);
624
    }
625
    (*str)[size] = '\0';
626

    
627
    return 0;
628
}
629

    
630
/*
631
 * Read the next element as binary data.
632
 * 0 is success, < 0 is failure.
633
 */
634
static int ebml_read_binary(ByteIOContext *pb, int length, EbmlBin *bin)
635
{
636
    av_free(bin->data);
637
    if (!(bin->data = av_malloc(length)))
638
        return AVERROR(ENOMEM);
639

    
640
    bin->size = length;
641
    bin->pos  = url_ftell(pb);
642
    if (get_buffer(pb, bin->data, length) != length)
643
        return AVERROR(EIO);
644

    
645
    return 0;
646
}
647

    
648
/*
649
 * Read the next element, but only the header. The contents
650
 * are supposed to be sub-elements which can be read separately.
651
 * 0 is success, < 0 is failure.
652
 */
653
static int ebml_read_master(MatroskaDemuxContext *matroska, int length)
654
{
655
    ByteIOContext *pb = matroska->ctx->pb;
656
    MatroskaLevel *level;
657

    
658
    if (matroska->num_levels >= EBML_MAX_DEPTH) {
659
        av_log(matroska->ctx, AV_LOG_ERROR,
660
               "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
661
        return AVERROR(ENOSYS);
662
    }
663

    
664
    level = &matroska->levels[matroska->num_levels++];
665
    level->start = url_ftell(pb);
666
    level->length = length;
667

    
668
    return 0;
669
}
670

    
671
/*
672
 * Read signed/unsigned "EBML" numbers.
673
 * Return: number of bytes processed, < 0 on error
674
 */
675
static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
676
                                 uint8_t *data, uint32_t size, uint64_t *num)
677
{
678
    ByteIOContext pb;
679
    init_put_byte(&pb, data, size, 0, NULL, NULL, NULL, NULL);
680
    return ebml_read_num(matroska, &pb, 8, num);
681
}
682

    
683
/*
684
 * Same as above, but signed.
685
 */
686
static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
687
                                 uint8_t *data, uint32_t size, int64_t *num)
688
{
689
    uint64_t unum;
690
    int res;
691

    
692
    /* read as unsigned number first */
693
    if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
694
        return res;
695

    
696
    /* make signed (weird way) */
697
    *num = unum - ((1LL << (7*res - 1)) - 1);
698

    
699
    return res;
700
}
701

    
702
static int ebml_parse_elem(MatroskaDemuxContext *matroska,
703
                           EbmlSyntax *syntax, void *data);
704

    
705
static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
706
                         uint32_t id, void *data)
707
{
708
    int i;
709
    for (i=0; syntax[i].id; i++)
710
        if (id == syntax[i].id)
711
            break;
712
    if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32)
713
        av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
714
    return ebml_parse_elem(matroska, &syntax[i], data);
715
}
716

    
717
static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
718
                      void *data)
719
{
720
    uint64_t id;
721
    int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
722
    id |= 1 << 7*res;
723
    return res < 0 ? res : ebml_parse_id(matroska, syntax, id, data);
724
}
725

    
726
static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
727
                           void *data)
728
{
729
    int i, res = 0;
730

    
731
    for (i=0; syntax[i].id; i++)
732
        switch (syntax[i].type) {
733
        case EBML_UINT:
734
            *(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
735
            break;
736
        case EBML_FLOAT:
737
            *(double   *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
738
            break;
739
        case EBML_STR:
740
        case EBML_UTF8:
741
            *(char    **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
742
            break;
743
        }
744

    
745
    while (!res && !ebml_level_end(matroska))
746
        res = ebml_parse(matroska, syntax, data);
747

    
748
    return res;
749
}
750

    
751
static int ebml_parse_elem(MatroskaDemuxContext *matroska,
752
                           EbmlSyntax *syntax, void *data)
753
{
754
    ByteIOContext *pb = matroska->ctx->pb;
755
    uint32_t id = syntax->id;
756
    uint64_t length;
757
    int res;
758

    
759
    data = (char *)data + syntax->data_offset;
760
    if (syntax->list_elem_size) {
761
        EbmlList *list = data;
762
        list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
763
        data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
764
        memset(data, 0, syntax->list_elem_size);
765
        list->nb_elem++;
766
    }
767

    
768
    if (syntax->type != EBML_PASS && syntax->type != EBML_STOP)
769
        if ((res = ebml_read_num(matroska, pb, 8, &length)) < 0)
770
            return res;
771

    
772
    switch (syntax->type) {
773
    case EBML_UINT:  res = ebml_read_uint  (pb, length, data);  break;
774
    case EBML_FLOAT: res = ebml_read_float (pb, length, data);  break;
775
    case EBML_STR:
776
    case EBML_UTF8:  res = ebml_read_ascii (pb, length, data);  break;
777
    case EBML_BIN:   res = ebml_read_binary(pb, length, data);  break;
778
    case EBML_NEST:  if ((res=ebml_read_master(matroska, length)) < 0)
779
                         return res;
780
                     if (id == MATROSKA_ID_SEGMENT)
781
                         matroska->segment_start = url_ftell(matroska->ctx->pb);
782
                     return ebml_parse_nest(matroska, syntax->def.n, data);
783
    case EBML_PASS:  return ebml_parse_id(matroska, syntax->def.n, id, data);
784
    case EBML_STOP:  *(int *)data = 1;      return 1;
785
    default:         return url_fseek(pb,length,SEEK_CUR)<0 ? AVERROR(EIO) : 0;
786
    }
787
    if (res == AVERROR_INVALIDDATA)
788
        av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
789
    else if (res == AVERROR(EIO))
790
        av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
791
    return res;
792
}
793

    
794
static void ebml_free(EbmlSyntax *syntax, void *data)
795
{
796
    int i, j;
797
    for (i=0; syntax[i].id; i++) {
798
        void *data_off = (char *)data + syntax[i].data_offset;
799
        switch (syntax[i].type) {
800
        case EBML_STR:
801
        case EBML_UTF8:  av_freep(data_off);                      break;
802
        case EBML_BIN:   av_freep(&((EbmlBin *)data_off)->data);  break;
803
        case EBML_NEST:
804
            if (syntax[i].list_elem_size) {
805
                EbmlList *list = data_off;
806
                char *ptr = list->elem;
807
                for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
808
                    ebml_free(syntax[i].def.n, ptr);
809
                av_free(list->elem);
810
            } else
811
                ebml_free(syntax[i].def.n, data_off);
812
        default:  break;
813
        }
814
    }
815
}
816

    
817

    
818
/*
819
 * Autodetecting...
820
 */
821
static int matroska_probe(AVProbeData *p)
822
{
823
    uint64_t total = 0;
824
    int len_mask = 0x80, size = 1, n = 1;
825
    static const char probe_data[] = "matroska";
826

    
827
    /* EBML header? */
828
    if (AV_RB32(p->buf) != EBML_ID_HEADER)
829
        return 0;
830

    
831
    /* length of header */
832
    total = p->buf[4];
833
    while (size <= 8 && !(total & len_mask)) {
834
        size++;
835
        len_mask >>= 1;
836
    }
837
    if (size > 8)
838
      return 0;
839
    total &= (len_mask - 1);
840
    while (n < size)
841
        total = (total << 8) | p->buf[4 + n++];
842

    
843
    /* Does the probe data contain the whole header? */
844
    if (p->buf_size < 4 + size + total)
845
      return 0;
846

    
847
    /* The header must contain the document type 'matroska'. For now,
848
     * we don't parse the whole header but simply check for the
849
     * availability of that array of characters inside the header.
850
     * Not fully fool-proof, but good enough. */
851
    for (n = 4+size; n <= 4+size+total-(sizeof(probe_data)-1); n++)
852
        if (!memcmp(p->buf+n, probe_data, sizeof(probe_data)-1))
853
            return AVPROBE_SCORE_MAX;
854

    
855
    return 0;
856
}
857

    
858
static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
859
                                                 int num)
860
{
861
    MatroskaTrack *tracks = matroska->tracks.elem;
862
    int i;
863

    
864
    for (i=0; i < matroska->tracks.nb_elem; i++)
865
        if (tracks[i].num == num)
866
            return &tracks[i];
867

    
868
    av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
869
    return NULL;
870
}
871

    
872
static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
873
                                  MatroskaTrack *track)
874
{
875
    MatroskaTrackEncoding *encodings = track->encodings.elem;
876
    uint8_t* data = *buf;
877
    int isize = *buf_size;
878
    uint8_t* pkt_data = NULL;
879
    int pkt_size = isize;
880
    int result = 0;
881
    int olen;
882

    
883
    switch (encodings[0].compression.algo) {
884
    case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
885
        return encodings[0].compression.settings.size;
886
    case MATROSKA_TRACK_ENCODING_COMP_LZO:
887
        do {
888
            olen = pkt_size *= 3;
889
            pkt_data = av_realloc(pkt_data, pkt_size+AV_LZO_OUTPUT_PADDING);
890
            result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
891
        } while (result==AV_LZO_OUTPUT_FULL && pkt_size<10000000);
892
        if (result)
893
            goto failed;
894
        pkt_size -= olen;
895
        break;
896
#if CONFIG_ZLIB
897
    case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
898
        z_stream zstream = {0};
899
        if (inflateInit(&zstream) != Z_OK)
900
            return -1;
901
        zstream.next_in = data;
902
        zstream.avail_in = isize;
903
        do {
904
            pkt_size *= 3;
905
            pkt_data = av_realloc(pkt_data, pkt_size);
906
            zstream.avail_out = pkt_size - zstream.total_out;
907
            zstream.next_out = pkt_data + zstream.total_out;
908
            result = inflate(&zstream, Z_NO_FLUSH);
909
        } while (result==Z_OK && pkt_size<10000000);
910
        pkt_size = zstream.total_out;
911
        inflateEnd(&zstream);
912
        if (result != Z_STREAM_END)
913
            goto failed;
914
        break;
915
    }
916
#endif
917
#if CONFIG_BZLIB
918
    case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
919
        bz_stream bzstream = {0};
920
        if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
921
            return -1;
922
        bzstream.next_in = data;
923
        bzstream.avail_in = isize;
924
        do {
925
            pkt_size *= 3;
926
            pkt_data = av_realloc(pkt_data, pkt_size);
927
            bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
928
            bzstream.next_out = pkt_data + bzstream.total_out_lo32;
929
            result = BZ2_bzDecompress(&bzstream);
930
        } while (result==BZ_OK && pkt_size<10000000);
931
        pkt_size = bzstream.total_out_lo32;
932
        BZ2_bzDecompressEnd(&bzstream);
933
        if (result != BZ_STREAM_END)
934
            goto failed;
935
        break;
936
    }
937
#endif
938
    default:
939
        return -1;
940
    }
941

    
942
    *buf = pkt_data;
943
    *buf_size = pkt_size;
944
    return 0;
945
 failed:
946
    av_free(pkt_data);
947
    return -1;
948
}
949

    
950
static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
951
                                    AVPacket *pkt, uint64_t display_duration)
952
{
953
    char *line, *layer, *ptr = pkt->data, *end = ptr+pkt->size;
954
    for (; *ptr!=',' && ptr<end-1; ptr++);
955
    if (*ptr == ',')
956
        layer = ++ptr;
957
    for (; *ptr!=',' && ptr<end-1; ptr++);
958
    if (*ptr == ',') {
959
        int64_t end_pts = pkt->pts + display_duration;
960
        int sc = matroska->time_scale * pkt->pts / 10000000;
961
        int ec = matroska->time_scale * end_pts  / 10000000;
962
        int sh, sm, ss, eh, em, es, len;
963
        sh = sc/360000;  sc -= 360000*sh;
964
        sm = sc/  6000;  sc -=   6000*sm;
965
        ss = sc/   100;  sc -=    100*ss;
966
        eh = ec/360000;  ec -= 360000*eh;
967
        em = ec/  6000;  ec -=   6000*em;
968
        es = ec/   100;  ec -=    100*es;
969
        *ptr++ = '\0';
970
        len = 50 + end-ptr + FF_INPUT_BUFFER_PADDING_SIZE;
971
        if (!(line = av_malloc(len)))
972
            return;
973
        snprintf(line,len,"Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
974
                 layer, sh, sm, ss, sc, eh, em, es, ec, ptr);
975
        av_free(pkt->data);
976
        pkt->data = line;
977
        pkt->size = strlen(line);
978
    }
979
}
980

    
981
static void matroska_merge_packets(AVPacket *out, AVPacket *in)
982
{
983
    out->data = av_realloc(out->data, out->size+in->size);
984
    memcpy(out->data+out->size, in->data, in->size);
985
    out->size += in->size;
986
    av_destruct_packet(in);
987
    av_free(in);
988
}
989

    
990
static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
991
                                 AVMetadata **metadata, char *prefix)
992
{
993
    MatroskaTag *tags = list->elem;
994
    char key[1024];
995
    int i;
996

    
997
    for (i=0; i < list->nb_elem; i++) {
998
        const char *lang = strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
999
        if (prefix)  snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1000
        else         av_strlcpy(key, tags[i].name, sizeof(key));
1001
        if (tags[i].def || !lang) {
1002
        av_metadata_set(metadata, key, tags[i].string);
1003
        if (tags[i].sub.nb_elem)
1004
            matroska_convert_tag(s, &tags[i].sub, metadata, key);
1005
        }
1006
        if (lang) {
1007
            av_strlcat(key, "-", sizeof(key));
1008
            av_strlcat(key, lang, sizeof(key));
1009
            av_metadata_set(metadata, key, tags[i].string);
1010
            if (tags[i].sub.nb_elem)
1011
                matroska_convert_tag(s, &tags[i].sub, metadata, key);
1012
        }
1013
    }
1014
}
1015

    
1016
static void matroska_convert_tags(AVFormatContext *s)
1017
{
1018
    MatroskaDemuxContext *matroska = s->priv_data;
1019
    MatroskaTags *tags = matroska->tags.elem;
1020
    int i, j;
1021

    
1022
    for (i=0; i < matroska->tags.nb_elem; i++) {
1023
        if (tags[i].target.attachuid) {
1024
            MatroskaAttachement *attachment = matroska->attachments.elem;
1025
            for (j=0; j<matroska->attachments.nb_elem; j++)
1026
                if (attachment[j].uid == tags[i].target.attachuid)
1027
                    matroska_convert_tag(s, &tags[i].tag,
1028
                                         &attachment[j].stream->metadata, NULL);
1029
        } else if (tags[i].target.chapteruid) {
1030
            MatroskaChapter *chapter = matroska->chapters.elem;
1031
            for (j=0; j<matroska->chapters.nb_elem; j++)
1032
                if (chapter[j].uid == tags[i].target.chapteruid)
1033
                    matroska_convert_tag(s, &tags[i].tag,
1034
                                         &chapter[j].chapter->metadata, NULL);
1035
        } else if (tags[i].target.trackuid) {
1036
            MatroskaTrack *track = matroska->tracks.elem;
1037
            for (j=0; j<matroska->tracks.nb_elem; j++)
1038
                if (track[j].uid == tags[i].target.trackuid)
1039
                    matroska_convert_tag(s, &tags[i].tag,
1040
                                         &track[j].stream->metadata, NULL);
1041
        } else {
1042
            matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1043
                                 tags[i].target.type);
1044
        }
1045
    }
1046
}
1047

    
1048
static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1049
{
1050
    EbmlList *seekhead_list = &matroska->seekhead;
1051
    MatroskaSeekhead *seekhead = seekhead_list->elem;
1052
    uint32_t level_up = matroska->level_up;
1053
    int64_t before_pos = url_ftell(matroska->ctx->pb);
1054
    MatroskaLevel level;
1055
    int i;
1056

    
1057
    for (i=0; i<seekhead_list->nb_elem; i++) {
1058
        int64_t offset = seekhead[i].pos + matroska->segment_start;
1059

    
1060
        if (seekhead[i].pos <= before_pos
1061
            || seekhead[i].id == MATROSKA_ID_SEEKHEAD
1062
            || seekhead[i].id == MATROSKA_ID_CLUSTER)
1063
            continue;
1064

    
1065
        /* seek */
1066
        if (url_fseek(matroska->ctx->pb, offset, SEEK_SET) != offset)
1067
            continue;
1068

    
1069
        /* We don't want to lose our seekhead level, so we add
1070
         * a dummy. This is a crude hack. */
1071
        if (matroska->num_levels == EBML_MAX_DEPTH) {
1072
            av_log(matroska->ctx, AV_LOG_INFO,
1073
                   "Max EBML element depth (%d) reached, "
1074
                   "cannot parse further.\n", EBML_MAX_DEPTH);
1075
            break;
1076
        }
1077

    
1078
        level.start = 0;
1079
        level.length = (uint64_t)-1;
1080
        matroska->levels[matroska->num_levels] = level;
1081
        matroska->num_levels++;
1082

    
1083
        ebml_parse(matroska, matroska_segment, matroska);
1084

    
1085
        /* remove dummy level */
1086
        while (matroska->num_levels) {
1087
            uint64_t length = matroska->levels[--matroska->num_levels].length;
1088
            if (length == (uint64_t)-1)
1089
                break;
1090
        }
1091
    }
1092

    
1093
    /* seek back */
1094
    url_fseek(matroska->ctx->pb, before_pos, SEEK_SET);
1095
    matroska->level_up = level_up;
1096
}
1097

    
1098
static int matroska_aac_profile(char *codec_id)
1099
{
1100
    static const char * const aac_profiles[] = { "MAIN", "LC", "SSR" };
1101
    int profile;
1102

    
1103
    for (profile=0; profile<FF_ARRAY_ELEMS(aac_profiles); profile++)
1104
        if (strstr(codec_id, aac_profiles[profile]))
1105
            break;
1106
    return profile + 1;
1107
}
1108

    
1109
static int matroska_aac_sri(int samplerate)
1110
{
1111
    int sri;
1112

    
1113
    for (sri=0; sri<FF_ARRAY_ELEMS(ff_mpeg4audio_sample_rates); sri++)
1114
        if (ff_mpeg4audio_sample_rates[sri] == samplerate)
1115
            break;
1116
    return sri;
1117
}
1118

    
1119
static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
1120
{
1121
    MatroskaDemuxContext *matroska = s->priv_data;
1122
    EbmlList *attachements_list = &matroska->attachments;
1123
    MatroskaAttachement *attachements;
1124
    EbmlList *chapters_list = &matroska->chapters;
1125
    MatroskaChapter *chapters;
1126
    MatroskaTrack *tracks;
1127
    EbmlList *index_list;
1128
    MatroskaIndex *index;
1129
    int index_scale = 1;
1130
    uint64_t max_start = 0;
1131
    Ebml ebml = { 0 };
1132
    AVStream *st;
1133
    int i, j;
1134

    
1135
    matroska->ctx = s;
1136

    
1137
    /* First read the EBML header. */
1138
    if (ebml_parse(matroska, ebml_syntax, &ebml)
1139
        || ebml.version > EBML_VERSION       || ebml.max_size > sizeof(uint64_t)
1140
        || ebml.id_length > sizeof(uint32_t) || strcmp(ebml.doctype, "matroska")
1141
        || ebml.doctype_version > 2) {
1142
        av_log(matroska->ctx, AV_LOG_ERROR,
1143
               "EBML header using unsupported features\n"
1144
               "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
1145
               ebml.version, ebml.doctype, ebml.doctype_version);
1146
        return AVERROR_NOFMT;
1147
    }
1148
    ebml_free(ebml_syntax, &ebml);
1149

    
1150
    /* The next thing is a segment. */
1151
    if (ebml_parse(matroska, matroska_segments, matroska) < 0)
1152
        return -1;
1153
    matroska_execute_seekhead(matroska);
1154

    
1155
    if (matroska->duration)
1156
        matroska->ctx->duration = matroska->duration * matroska->time_scale
1157
                                  * 1000 / AV_TIME_BASE;
1158
    av_metadata_set(&s->metadata, "title", matroska->title);
1159

    
1160
    tracks = matroska->tracks.elem;
1161
    for (i=0; i < matroska->tracks.nb_elem; i++) {
1162
        MatroskaTrack *track = &tracks[i];
1163
        enum CodecID codec_id = CODEC_ID_NONE;
1164
        EbmlList *encodings_list = &tracks->encodings;
1165
        MatroskaTrackEncoding *encodings = encodings_list->elem;
1166
        uint8_t *extradata = NULL;
1167
        int extradata_size = 0;
1168
        int extradata_offset = 0;
1169
        ByteIOContext b;
1170

    
1171
        /* Apply some sanity checks. */
1172
        if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1173
            track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1174
            track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1175
            av_log(matroska->ctx, AV_LOG_INFO,
1176
                   "Unknown or unsupported track type %"PRIu64"\n",
1177
                   track->type);
1178
            continue;
1179
        }
1180
        if (track->codec_id == NULL)
1181
            continue;
1182

    
1183
        if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1184
            if (!track->default_duration)
1185
                track->default_duration = 1000000000/track->video.frame_rate;
1186
            if (!track->video.display_width)
1187
                track->video.display_width = track->video.pixel_width;
1188
            if (!track->video.display_height)
1189
                track->video.display_height = track->video.pixel_height;
1190
        } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1191
            if (!track->audio.out_samplerate)
1192
                track->audio.out_samplerate = track->audio.samplerate;
1193
        }
1194
        if (encodings_list->nb_elem > 1) {
1195
            av_log(matroska->ctx, AV_LOG_ERROR,
1196
                   "Multiple combined encodings no supported");
1197
        } else if (encodings_list->nb_elem == 1) {
1198
            if (encodings[0].type ||
1199
                (encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
1200
#if CONFIG_ZLIB
1201
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1202
#endif
1203
#if CONFIG_BZLIB
1204
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1205
#endif
1206
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
1207
                encodings[0].scope = 0;
1208
                av_log(matroska->ctx, AV_LOG_ERROR,
1209
                       "Unsupported encoding type");
1210
            } else if (track->codec_priv.size && encodings[0].scope&2) {
1211
                uint8_t *codec_priv = track->codec_priv.data;
1212
                int offset = matroska_decode_buffer(&track->codec_priv.data,
1213
                                                    &track->codec_priv.size,
1214
                                                    track);
1215
                if (offset < 0) {
1216
                    track->codec_priv.data = NULL;
1217
                    track->codec_priv.size = 0;
1218
                    av_log(matroska->ctx, AV_LOG_ERROR,
1219
                           "Failed to decode codec private data\n");
1220
                } else if (offset > 0) {
1221
                    track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
1222
                    memcpy(track->codec_priv.data,
1223
                           encodings[0].compression.settings.data, offset);
1224
                    memcpy(track->codec_priv.data+offset, codec_priv,
1225
                           track->codec_priv.size);
1226
                    track->codec_priv.size += offset;
1227
                }
1228
                if (codec_priv != track->codec_priv.data)
1229
                    av_free(codec_priv);
1230
            }
1231
        }
1232

    
1233
        for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
1234
            if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1235
                        strlen(ff_mkv_codec_tags[j].str))){
1236
                codec_id= ff_mkv_codec_tags[j].id;
1237
                break;
1238
            }
1239
        }
1240

    
1241
        st = track->stream = av_new_stream(s, 0);
1242
        if (st == NULL)
1243
            return AVERROR(ENOMEM);
1244

    
1245
        if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")
1246
            && track->codec_priv.size >= 40
1247
            && track->codec_priv.data != NULL) {
1248
            track->ms_compat = 1;
1249
            track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
1250
            codec_id = ff_codec_get_id(ff_codec_bmp_tags, track->video.fourcc);
1251
            extradata_offset = 40;
1252
        } else if (!strcmp(track->codec_id, "A_MS/ACM")
1253
                   && track->codec_priv.size >= 14
1254
                   && track->codec_priv.data != NULL) {
1255
            init_put_byte(&b, track->codec_priv.data, track->codec_priv.size,
1256
                          URL_RDONLY, NULL, NULL, NULL, NULL);
1257
            ff_get_wav_header(&b, st->codec, track->codec_priv.size);
1258
            codec_id = st->codec->codec_id;
1259
            extradata_offset = FFMIN(track->codec_priv.size, 18);
1260
        } else if (!strcmp(track->codec_id, "V_QUICKTIME")
1261
                   && (track->codec_priv.size >= 86)
1262
                   && (track->codec_priv.data != NULL)) {
1263
            track->video.fourcc = AV_RL32(track->codec_priv.data);
1264
            codec_id=ff_codec_get_id(codec_movvideo_tags, track->video.fourcc);
1265
        } else if (codec_id == CODEC_ID_PCM_S16BE) {
1266
            switch (track->audio.bitdepth) {
1267
            case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1268
            case 24:  codec_id = CODEC_ID_PCM_S24BE;  break;
1269
            case 32:  codec_id = CODEC_ID_PCM_S32BE;  break;
1270
            }
1271
        } else if (codec_id == CODEC_ID_PCM_S16LE) {
1272
            switch (track->audio.bitdepth) {
1273
            case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1274
            case 24:  codec_id = CODEC_ID_PCM_S24LE;  break;
1275
            case 32:  codec_id = CODEC_ID_PCM_S32LE;  break;
1276
            }
1277
        } else if (codec_id==CODEC_ID_PCM_F32LE && track->audio.bitdepth==64) {
1278
            codec_id = CODEC_ID_PCM_F64LE;
1279
        } else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
1280
            int profile = matroska_aac_profile(track->codec_id);
1281
            int sri = matroska_aac_sri(track->audio.samplerate);
1282
            extradata = av_malloc(5);
1283
            if (extradata == NULL)
1284
                return AVERROR(ENOMEM);
1285
            extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
1286
            extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
1287
            if (strstr(track->codec_id, "SBR")) {
1288
                sri = matroska_aac_sri(track->audio.out_samplerate);
1289
                extradata[2] = 0x56;
1290
                extradata[3] = 0xE5;
1291
                extradata[4] = 0x80 | (sri<<3);
1292
                extradata_size = 5;
1293
            } else
1294
                extradata_size = 2;
1295
        } else if (codec_id == CODEC_ID_TTA) {
1296
            extradata_size = 30;
1297
            extradata = av_mallocz(extradata_size);
1298
            if (extradata == NULL)
1299
                return AVERROR(ENOMEM);
1300
            init_put_byte(&b, extradata, extradata_size, 1,
1301
                          NULL, NULL, NULL, NULL);
1302
            put_buffer(&b, "TTA1", 4);
1303
            put_le16(&b, 1);
1304
            put_le16(&b, track->audio.channels);
1305
            put_le16(&b, track->audio.bitdepth);
1306
            put_le32(&b, track->audio.out_samplerate);
1307
            put_le32(&b, matroska->ctx->duration * track->audio.out_samplerate);
1308
        } else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
1309
                   codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
1310
            extradata_offset = 26;
1311
        } else if (codec_id == CODEC_ID_RA_144) {
1312
            track->audio.out_samplerate = 8000;
1313
            track->audio.channels = 1;
1314
        } else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
1315
                   codec_id == CODEC_ID_ATRAC3) {
1316
            init_put_byte(&b, track->codec_priv.data,track->codec_priv.size,
1317
                          0, NULL, NULL, NULL, NULL);
1318
            url_fskip(&b, 24);
1319
            track->audio.coded_framesize = get_be32(&b);
1320
            url_fskip(&b, 12);
1321
            track->audio.sub_packet_h    = get_be16(&b);
1322
            track->audio.frame_size      = get_be16(&b);
1323
            track->audio.sub_packet_size = get_be16(&b);
1324
            track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
1325
            if (codec_id == CODEC_ID_RA_288) {
1326
                st->codec->block_align = track->audio.coded_framesize;
1327
                track->codec_priv.size = 0;
1328
            } else {
1329
                st->codec->block_align = track->audio.sub_packet_size;
1330
                extradata_offset = 78;
1331
            }
1332
        }
1333
        track->codec_priv.size -= extradata_offset;
1334

    
1335
        if (codec_id == CODEC_ID_NONE)
1336
            av_log(matroska->ctx, AV_LOG_INFO,
1337
                   "Unknown/unsupported CodecID %s.\n", track->codec_id);
1338

    
1339
        if (track->time_scale < 0.01)
1340
            track->time_scale = 1.0;
1341
        av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
1342

    
1343
        st->codec->codec_id = codec_id;
1344
        st->start_time = 0;
1345
        if (strcmp(track->language, "und"))
1346
            av_metadata_set(&st->metadata, "language", track->language);
1347
        av_metadata_set(&st->metadata, "title", track->name);
1348

    
1349
        if (track->flag_default)
1350
            st->disposition |= AV_DISPOSITION_DEFAULT;
1351

    
1352
        if (track->default_duration)
1353
            av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
1354
                      track->default_duration, 1000000000, 30000);
1355

    
1356
        if (!st->codec->extradata) {
1357
            if(extradata){
1358
                st->codec->extradata = extradata;
1359
                st->codec->extradata_size = extradata_size;
1360
            } else if(track->codec_priv.data && track->codec_priv.size > 0){
1361
                st->codec->extradata = av_mallocz(track->codec_priv.size +
1362
                                                  FF_INPUT_BUFFER_PADDING_SIZE);
1363
                if(st->codec->extradata == NULL)
1364
                    return AVERROR(ENOMEM);
1365
                st->codec->extradata_size = track->codec_priv.size;
1366
                memcpy(st->codec->extradata,
1367
                       track->codec_priv.data + extradata_offset,
1368
                       track->codec_priv.size);
1369
            }
1370
        }
1371

    
1372
        if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1373
            st->codec->codec_type = CODEC_TYPE_VIDEO;
1374
            st->codec->codec_tag  = track->video.fourcc;
1375
            st->codec->width  = track->video.pixel_width;
1376
            st->codec->height = track->video.pixel_height;
1377
            av_reduce(&st->sample_aspect_ratio.num,
1378
                      &st->sample_aspect_ratio.den,
1379
                      st->codec->height * track->video.display_width,
1380
                      st->codec-> width * track->video.display_height,
1381
                      255);
1382
            if (st->codec->codec_id != CODEC_ID_H264)
1383
            st->need_parsing = AVSTREAM_PARSE_HEADERS;
1384
        } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1385
            st->codec->codec_type = CODEC_TYPE_AUDIO;
1386
            st->codec->sample_rate = track->audio.out_samplerate;
1387
            st->codec->channels = track->audio.channels;
1388
        } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1389
            st->codec->codec_type = CODEC_TYPE_SUBTITLE;
1390
        }
1391
    }
1392

    
1393
    attachements = attachements_list->elem;
1394
    for (j=0; j<attachements_list->nb_elem; j++) {
1395
        if (!(attachements[j].filename && attachements[j].mime &&
1396
              attachements[j].bin.data && attachements[j].bin.size > 0)) {
1397
            av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
1398
        } else {
1399
            AVStream *st = av_new_stream(s, 0);
1400
            if (st == NULL)
1401
                break;
1402
            av_metadata_set(&st->metadata, "filename",attachements[j].filename);
1403
            st->codec->codec_id = CODEC_ID_NONE;
1404
            st->codec->codec_type = CODEC_TYPE_ATTACHMENT;
1405
            st->codec->extradata  = av_malloc(attachements[j].bin.size);
1406
            if(st->codec->extradata == NULL)
1407
                break;
1408
            st->codec->extradata_size = attachements[j].bin.size;
1409
            memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
1410

    
1411
            for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
1412
                if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
1413
                             strlen(ff_mkv_mime_tags[i].str))) {
1414
                    st->codec->codec_id = ff_mkv_mime_tags[i].id;
1415
                    break;
1416
                }
1417
            }
1418
            attachements[j].stream = st;
1419
        }
1420
    }
1421

    
1422
    chapters = chapters_list->elem;
1423
    for (i=0; i<chapters_list->nb_elem; i++)
1424
        if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid
1425
            && (max_start==0 || chapters[i].start > max_start)) {
1426
            chapters[i].chapter =
1427
            ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
1428
                           chapters[i].start, chapters[i].end,
1429
                           chapters[i].title);
1430
            av_metadata_set(&chapters[i].chapter->metadata,
1431
                            "title", chapters[i].title);
1432
            max_start = chapters[i].start;
1433
        }
1434

    
1435
    index_list = &matroska->index;
1436
    index = index_list->elem;
1437
    if (index_list->nb_elem
1438
        && index[0].time > 100000000000000/matroska->time_scale) {
1439
        av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
1440
        index_scale = matroska->time_scale;
1441
    }
1442
    for (i=0; i<index_list->nb_elem; i++) {
1443
        EbmlList *pos_list = &index[i].pos;
1444
        MatroskaIndexPos *pos = pos_list->elem;
1445
        for (j=0; j<pos_list->nb_elem; j++) {
1446
            MatroskaTrack *track = matroska_find_track_by_num(matroska,
1447
                                                              pos[j].track);
1448
            if (track && track->stream)
1449
                av_add_index_entry(track->stream,
1450
                                   pos[j].pos + matroska->segment_start,
1451
                                   index[i].time/index_scale, 0, 0,
1452
                                   AVINDEX_KEYFRAME);
1453
        }
1454
    }
1455

    
1456
    matroska_convert_tags(s);
1457

    
1458
    return 0;
1459
}
1460

    
1461
/*
1462
 * Put one packet in an application-supplied AVPacket struct.
1463
 * Returns 0 on success or -1 on failure.
1464
 */
1465
static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
1466
                                   AVPacket *pkt)
1467
{
1468
    if (matroska->num_packets > 0) {
1469
        memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
1470
        av_free(matroska->packets[0]);
1471
        if (matroska->num_packets > 1) {
1472
            memmove(&matroska->packets[0], &matroska->packets[1],
1473
                    (matroska->num_packets - 1) * sizeof(AVPacket *));
1474
            matroska->packets =
1475
                av_realloc(matroska->packets, (matroska->num_packets - 1) *
1476
                           sizeof(AVPacket *));
1477
        } else {
1478
            av_freep(&matroska->packets);
1479
        }
1480
        matroska->num_packets--;
1481
        return 0;
1482
    }
1483

    
1484
    return -1;
1485
}
1486

    
1487
/*
1488
 * Free all packets in our internal queue.
1489
 */
1490
static void matroska_clear_queue(MatroskaDemuxContext *matroska)
1491
{
1492
    if (matroska->packets) {
1493
        int n;
1494
        for (n = 0; n < matroska->num_packets; n++) {
1495
            av_free_packet(matroska->packets[n]);
1496
            av_free(matroska->packets[n]);
1497
        }
1498
        av_freep(&matroska->packets);
1499
        matroska->num_packets = 0;
1500
    }
1501
}
1502

    
1503
static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
1504
                                int size, int64_t pos, uint64_t cluster_time,
1505
                                uint64_t duration, int is_keyframe,
1506
                                int64_t cluster_pos)
1507
{
1508
    uint64_t timecode = AV_NOPTS_VALUE;
1509
    MatroskaTrack *track;
1510
    int res = 0;
1511
    AVStream *st;
1512
    AVPacket *pkt;
1513
    int16_t block_time;
1514
    uint32_t *lace_size = NULL;
1515
    int n, flags, laces = 0;
1516
    uint64_t num;
1517

    
1518
    if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
1519
        av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
1520
        return res;
1521
    }
1522
    data += n;
1523
    size -= n;
1524

    
1525
    track = matroska_find_track_by_num(matroska, num);
1526
    if (size <= 3 || !track || !track->stream) {
1527
        av_log(matroska->ctx, AV_LOG_INFO,
1528
               "Invalid stream %"PRIu64" or size %u\n", num, size);
1529
        return res;
1530
    }
1531
    st = track->stream;
1532
    if (st->discard >= AVDISCARD_ALL)
1533
        return res;
1534
    if (duration == AV_NOPTS_VALUE)
1535
        duration = track->default_duration / matroska->time_scale;
1536

    
1537
    block_time = AV_RB16(data);
1538
    data += 2;
1539
    flags = *data++;
1540
    size -= 3;
1541
    if (is_keyframe == -1)
1542
        is_keyframe = flags & 0x80 ? PKT_FLAG_KEY : 0;
1543

    
1544
    if (cluster_time != (uint64_t)-1
1545
        && (block_time >= 0 || cluster_time >= -block_time)) {
1546
        timecode = cluster_time + block_time;
1547
        if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE
1548
            && timecode < track->end_timecode)
1549
            is_keyframe = 0;  /* overlapping subtitles are not key frame */
1550
        if (is_keyframe)
1551
            av_add_index_entry(st, cluster_pos, timecode, 0,0,AVINDEX_KEYFRAME);
1552
        track->end_timecode = FFMAX(track->end_timecode, timecode+duration);
1553
    }
1554

    
1555
    if (matroska->skip_to_keyframe && track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1556
        if (!is_keyframe || timecode < matroska->skip_to_timecode)
1557
            return res;
1558
        matroska->skip_to_keyframe = 0;
1559
    }
1560

    
1561
    switch ((flags & 0x06) >> 1) {
1562
        case 0x0: /* no lacing */
1563
            laces = 1;
1564
            lace_size = av_mallocz(sizeof(int));
1565
            lace_size[0] = size;
1566
            break;
1567

    
1568
        case 0x1: /* Xiph lacing */
1569
        case 0x2: /* fixed-size lacing */
1570
        case 0x3: /* EBML lacing */
1571
            assert(size>0); // size <=3 is checked before size-=3 above
1572
            laces = (*data) + 1;
1573
            data += 1;
1574
            size -= 1;
1575
            lace_size = av_mallocz(laces * sizeof(int));
1576

    
1577
            switch ((flags & 0x06) >> 1) {
1578
                case 0x1: /* Xiph lacing */ {
1579
                    uint8_t temp;
1580
                    uint32_t total = 0;
1581
                    for (n = 0; res == 0 && n < laces - 1; n++) {
1582
                        while (1) {
1583
                            if (size == 0) {
1584
                                res = -1;
1585
                                break;
1586
                            }
1587
                            temp = *data;
1588
                            lace_size[n] += temp;
1589
                            data += 1;
1590
                            size -= 1;
1591
                            if (temp != 0xff)
1592
                                break;
1593
                        }
1594
                        total += lace_size[n];
1595
                    }
1596
                    lace_size[n] = size - total;
1597
                    break;
1598
                }
1599

    
1600
                case 0x2: /* fixed-size lacing */
1601
                    for (n = 0; n < laces; n++)
1602
                        lace_size[n] = size / laces;
1603
                    break;
1604

    
1605
                case 0x3: /* EBML lacing */ {
1606
                    uint32_t total;
1607
                    n = matroska_ebmlnum_uint(matroska, data, size, &num);
1608
                    if (n < 0) {
1609
                        av_log(matroska->ctx, AV_LOG_INFO,
1610
                               "EBML block data error\n");
1611
                        break;
1612
                    }
1613
                    data += n;
1614
                    size -= n;
1615
                    total = lace_size[0] = num;
1616
                    for (n = 1; res == 0 && n < laces - 1; n++) {
1617
                        int64_t snum;
1618
                        int r;
1619
                        r = matroska_ebmlnum_sint(matroska, data, size, &snum);
1620
                        if (r < 0) {
1621
                            av_log(matroska->ctx, AV_LOG_INFO,
1622
                                   "EBML block data error\n");
1623
                            break;
1624
                        }
1625
                        data += r;
1626
                        size -= r;
1627
                        lace_size[n] = lace_size[n - 1] + snum;
1628
                        total += lace_size[n];
1629
                    }
1630
                    lace_size[n] = size - total;
1631
                    break;
1632
                }
1633
            }
1634
            break;
1635
    }
1636

    
1637
    if (res == 0) {
1638
        for (n = 0; n < laces; n++) {
1639
            if ((st->codec->codec_id == CODEC_ID_RA_288 ||
1640
                 st->codec->codec_id == CODEC_ID_COOK ||
1641
                 st->codec->codec_id == CODEC_ID_ATRAC3) &&
1642
                 st->codec->block_align && track->audio.sub_packet_size) {
1643
                int a = st->codec->block_align;
1644
                int sps = track->audio.sub_packet_size;
1645
                int cfs = track->audio.coded_framesize;
1646
                int h = track->audio.sub_packet_h;
1647
                int y = track->audio.sub_packet_cnt;
1648
                int w = track->audio.frame_size;
1649
                int x;
1650

    
1651
                if (!track->audio.pkt_cnt) {
1652
                    if (st->codec->codec_id == CODEC_ID_RA_288)
1653
                        for (x=0; x<h/2; x++)
1654
                            memcpy(track->audio.buf+x*2*w+y*cfs,
1655
                                   data+x*cfs, cfs);
1656
                    else
1657
                        for (x=0; x<w/sps; x++)
1658
                            memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
1659

    
1660
                    if (++track->audio.sub_packet_cnt >= h) {
1661
                        track->audio.sub_packet_cnt = 0;
1662
                        track->audio.pkt_cnt = h*w / a;
1663
                    }
1664
                }
1665
                while (track->audio.pkt_cnt) {
1666
                    pkt = av_mallocz(sizeof(AVPacket));
1667
                    av_new_packet(pkt, a);
1668
                    memcpy(pkt->data, track->audio.buf
1669
                           + a * (h*w / a - track->audio.pkt_cnt--), a);
1670
                    pkt->pos = pos;
1671
                    pkt->stream_index = st->index;
1672
                    dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1673
                }
1674
            } else {
1675
                MatroskaTrackEncoding *encodings = track->encodings.elem;
1676
                int offset = 0, pkt_size = lace_size[n];
1677
                uint8_t *pkt_data = data;
1678

    
1679
                if (encodings && encodings->scope & 1) {
1680
                    offset = matroska_decode_buffer(&pkt_data,&pkt_size, track);
1681
                    if (offset < 0)
1682
                        continue;
1683
                }
1684

    
1685
                pkt = av_mallocz(sizeof(AVPacket));
1686
                /* XXX: prevent data copy... */
1687
                if (av_new_packet(pkt, pkt_size+offset) < 0) {
1688
                    av_free(pkt);
1689
                    res = AVERROR(ENOMEM);
1690
                    break;
1691
                }
1692
                if (offset)
1693
                    memcpy (pkt->data, encodings->compression.settings.data, offset);
1694
                memcpy (pkt->data+offset, pkt_data, pkt_size);
1695

    
1696
                if (pkt_data != data)
1697
                    av_free(pkt_data);
1698

    
1699
                if (n == 0)
1700
                    pkt->flags = is_keyframe;
1701
                pkt->stream_index = st->index;
1702

    
1703
                if (track->ms_compat)
1704
                    pkt->dts = timecode;
1705
                else
1706
                pkt->pts = timecode;
1707
                pkt->pos = pos;
1708
                if (st->codec->codec_id == CODEC_ID_TEXT)
1709
                    pkt->convergence_duration = duration;
1710
                else if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE)
1711
                    pkt->duration = duration;
1712

    
1713
                if (st->codec->codec_id == CODEC_ID_SSA)
1714
                    matroska_fix_ass_packet(matroska, pkt, duration);
1715

    
1716
                if (matroska->prev_pkt &&
1717
                    timecode != AV_NOPTS_VALUE &&
1718
                    matroska->prev_pkt->pts == timecode &&
1719
                    matroska->prev_pkt->stream_index == st->index)
1720
                    matroska_merge_packets(matroska->prev_pkt, pkt);
1721
                else {
1722
                    dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1723
                    matroska->prev_pkt = pkt;
1724
                }
1725
            }
1726

    
1727
            if (timecode != AV_NOPTS_VALUE)
1728
                timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
1729
            data += lace_size[n];
1730
        }
1731
    }
1732

    
1733
    av_free(lace_size);
1734
    return res;
1735
}
1736

    
1737
static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
1738
{
1739
    MatroskaCluster cluster = { 0 };
1740
    EbmlList *blocks_list;
1741
    MatroskaBlock *blocks;
1742
    int i, res;
1743
    int64_t pos = url_ftell(matroska->ctx->pb);
1744
    matroska->prev_pkt = NULL;
1745
    if (matroska->has_cluster_id){
1746
        /* For the first cluster we parse, its ID was already read as
1747
           part of matroska_read_header(), so don't read it again */
1748
        res = ebml_parse_id(matroska, matroska_clusters,
1749
                            MATROSKA_ID_CLUSTER, &cluster);
1750
        pos -= 4;  /* sizeof the ID which was already read */
1751
        matroska->has_cluster_id = 0;
1752
    } else
1753
        res = ebml_parse(matroska, matroska_clusters, &cluster);
1754
    blocks_list = &cluster.blocks;
1755
    blocks = blocks_list->elem;
1756
    for (i=0; i<blocks_list->nb_elem; i++)
1757
        if (blocks[i].bin.size > 0) {
1758
            int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
1759
            res=matroska_parse_block(matroska,
1760
                                     blocks[i].bin.data, blocks[i].bin.size,
1761
                                     blocks[i].bin.pos,  cluster.timecode,
1762
                                     blocks[i].duration, is_keyframe,
1763
                                     pos);
1764
        }
1765
    ebml_free(matroska_cluster, &cluster);
1766
    if (res < 0)  matroska->done = 1;
1767
    return res;
1768
}
1769

    
1770
static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
1771
{
1772
    MatroskaDemuxContext *matroska = s->priv_data;
1773

    
1774
    while (matroska_deliver_packet(matroska, pkt)) {
1775
        if (matroska->done)
1776
            return AVERROR_EOF;
1777
        matroska_parse_cluster(matroska);
1778
    }
1779

    
1780
    return 0;
1781
}
1782

    
1783
static int matroska_read_seek(AVFormatContext *s, int stream_index,
1784
                              int64_t timestamp, int flags)
1785
{
1786
    MatroskaDemuxContext *matroska = s->priv_data;
1787
    MatroskaTrack *tracks = matroska->tracks.elem;
1788
    AVStream *st = s->streams[stream_index];
1789
    int i, index, index_sub, index_min;
1790

    
1791
    if (!st->nb_index_entries)
1792
        return 0;
1793
    timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
1794

    
1795
    if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1796
        url_fseek(s->pb, st->index_entries[st->nb_index_entries-1].pos, SEEK_SET);
1797
        while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1798
            matroska_clear_queue(matroska);
1799
            if (matroska_parse_cluster(matroska) < 0)
1800
                break;
1801
        }
1802
    }
1803

    
1804
    matroska_clear_queue(matroska);
1805
    if (index < 0)
1806
        return 0;
1807

    
1808
    index_min = index;
1809
    for (i=0; i < matroska->tracks.nb_elem; i++) {
1810
        tracks[i].end_timecode = 0;
1811
        if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE
1812
            && !tracks[i].stream->discard != AVDISCARD_ALL) {
1813
            index_sub = av_index_search_timestamp(tracks[i].stream, st->index_entries[index].timestamp, AVSEEK_FLAG_BACKWARD);
1814
            if (index_sub >= 0
1815
                && st->index_entries[index_sub].pos < st->index_entries[index_min].pos
1816
                && st->index_entries[index].timestamp - st->index_entries[index_sub].timestamp < 30000000000/matroska->time_scale)
1817
                index_min = index_sub;
1818
        }
1819
    }
1820

    
1821
    url_fseek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
1822
    matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
1823
    matroska->skip_to_timecode = st->index_entries[index].timestamp;
1824
    matroska->done = 0;
1825
    av_update_cur_dts(s, st, st->index_entries[index].timestamp);
1826
    return 0;
1827
}
1828

    
1829
static int matroska_read_close(AVFormatContext *s)
1830
{
1831
    MatroskaDemuxContext *matroska = s->priv_data;
1832
    MatroskaTrack *tracks = matroska->tracks.elem;
1833
    int n;
1834

    
1835
    matroska_clear_queue(matroska);
1836

    
1837
    for (n=0; n < matroska->tracks.nb_elem; n++)
1838
        if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
1839
            av_free(tracks[n].audio.buf);
1840
    ebml_free(matroska_segment, matroska);
1841

    
1842
    return 0;
1843
}
1844

    
1845
AVInputFormat matroska_demuxer = {
1846
    "matroska",
1847
    NULL_IF_CONFIG_SMALL("Matroska file format"),
1848
    sizeof(MatroskaDemuxContext),
1849
    matroska_probe,
1850
    matroska_read_header,
1851
    matroska_read_packet,
1852
    matroska_read_close,
1853
    matroska_read_seek,
1854
    .metadata_conv = ff_mkv_metadata_conv,
1855
};