git.sesse.net Git - ffmpeg/blob - libavformat/matroskadec.c

   1 /*
   2  * Matroska file demuxer
   3  * Copyright (c) 2003-2008 The Libav Project
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file
  24  * Matroska file demuxer
  25  * by Ronald Bultje <rbultje@ronald.bitfreak.net>
  26  * with a little help from Moritz Bunkus <moritz@bunkus.org>
  27  * totally reworked by Aurelien Jacobs <aurel@gnuage.org>
  28  * Specs available on the Matroska project page: http://www.matroska.org/.
  29  */
  30
  31 #include <stdio.h>
  32 #include "avformat.h"
  33 #include "internal.h"
  34 #include "avio_internal.h"
  35 /* For ff_codec_get_id(). */
  36 #include "riff.h"
  37 #include "isom.h"
  38 #include "rm.h"
  39 #include "matroska.h"
  40 #include "libavcodec/mpeg4audio.h"
  41 #include "libavutil/intfloat_readwrite.h"
  42 #include "libavutil/intreadwrite.h"
  43 #include "libavutil/avstring.h"
  44 #include "libavutil/lzo.h"
  45 #include "libavutil/dict.h"
  46 #if CONFIG_ZLIB
  47 #include <zlib.h>
  48 #endif
  49 #if CONFIG_BZLIB
  50 #include <bzlib.h>
  51 #endif
  52
  53 typedef enum {
  54     EBML_NONE,
  55     EBML_UINT,
  56     EBML_FLOAT,
  57     EBML_STR,
  58     EBML_UTF8,
  59     EBML_BIN,
  60     EBML_NEST,
  61     EBML_PASS,
  62     EBML_STOP,
  63     EBML_TYPE_COUNT
  64 } EbmlType;
  65
  66 typedef const struct EbmlSyntax {
  67     uint32_t id;
  68     EbmlType type;
  69     int list_elem_size;
  70     int data_offset;
  71     union {
  72         uint64_t    u;
  73         double      f;
  74         const char *s;
  75         const struct EbmlSyntax *n;
  76     } def;
  77 } EbmlSyntax;
  78
  79 typedef struct {
  80     int nb_elem;
  81     void *elem;
  82 } EbmlList;
  83
  84 typedef struct {
  85     int      size;
  86     uint8_t *data;
  87     int64_t  pos;
  88 } EbmlBin;
  89
  90 typedef struct {
  91     uint64_t version;
  92     uint64_t max_size;
  93     uint64_t id_length;
  94     char    *doctype;
  95     uint64_t doctype_version;
  96 } Ebml;
  97
  98 typedef struct {
  99     uint64_t algo;
 100     EbmlBin  settings;
 101 } MatroskaTrackCompression;
 102
 103 typedef struct {
 104     uint64_t scope;
 105     uint64_t type;
 106     MatroskaTrackCompression compression;
 107 } MatroskaTrackEncoding;
 108
 109 typedef struct {
 110     double   frame_rate;
 111     uint64_t display_width;
 112     uint64_t display_height;
 113     uint64_t pixel_width;
 114     uint64_t pixel_height;
 115     uint64_t fourcc;
 116 } MatroskaTrackVideo;
 117
 118 typedef struct {
 119     double   samplerate;
 120     double   out_samplerate;
 121     uint64_t bitdepth;
 122     uint64_t channels;
 123
 124     /* real audio header (extracted from extradata) */
 125     int      coded_framesize;
 126     int      sub_packet_h;
 127     int      frame_size;
 128     int      sub_packet_size;
 129     int      sub_packet_cnt;
 130     int      pkt_cnt;
 131     uint64_t buf_timecode;
 132     uint8_t *buf;
 133 } MatroskaTrackAudio;
 134
 135 typedef struct {
 136     uint64_t num;
 137     uint64_t uid;
 138     uint64_t type;
 139     char    *name;
 140     char    *codec_id;
 141     EbmlBin  codec_priv;
 142     char    *language;
 143     double time_scale;
 144     uint64_t default_duration;
 145     uint64_t flag_default;
 146     uint64_t flag_forced;
 147     MatroskaTrackVideo video;
 148     MatroskaTrackAudio audio;
 149     EbmlList encodings;
 150
 151     AVStream *stream;
 152     int64_t end_timecode;
 153     int ms_compat;
 154 } MatroskaTrack;
 155
 156 typedef struct {
 157     uint64_t uid;
 158     char *filename;
 159     char *mime;
 160     EbmlBin bin;
 161
 162     AVStream *stream;
 163 } MatroskaAttachement;
 164
 165 typedef struct {
 166     uint64_t start;
 167     uint64_t end;
 168     uint64_t uid;
 169     char    *title;
 170
 171     AVChapter *chapter;
 172 } MatroskaChapter;
 173
 174 typedef struct {
 175     uint64_t track;
 176     uint64_t pos;
 177 } MatroskaIndexPos;
 178
 179 typedef struct {
 180     uint64_t time;
 181     EbmlList pos;
 182 } MatroskaIndex;
 183
 184 typedef struct {
 185     char *name;
 186     char *string;
 187     char *lang;
 188     uint64_t def;
 189     EbmlList sub;
 190 } MatroskaTag;
 191
 192 typedef struct {
 193     char    *type;
 194     uint64_t typevalue;
 195     uint64_t trackuid;
 196     uint64_t chapteruid;
 197     uint64_t attachuid;
 198 } MatroskaTagTarget;
 199
 200 typedef struct {
 201     MatroskaTagTarget target;
 202     EbmlList tag;
 203 } MatroskaTags;
 204
 205 typedef struct {
 206     uint64_t id;
 207     uint64_t pos;
 208 } MatroskaSeekhead;
 209
 210 typedef struct {
 211     uint64_t start;
 212     uint64_t length;
 213 } MatroskaLevel;
 214
 215 typedef struct {
 216     AVFormatContext *ctx;
 217
 218     /* EBML stuff */
 219     int num_levels;
 220     MatroskaLevel levels[EBML_MAX_DEPTH];
 221     int level_up;
 222     uint32_t current_id;
 223
 224     uint64_t time_scale;
 225     double   duration;
 226     char    *title;
 227     EbmlList tracks;
 228     EbmlList attachments;
 229     EbmlList chapters;
 230     EbmlList index;
 231     EbmlList tags;
 232     EbmlList seekhead;
 233
 234     /* byte position of the segment inside the stream */
 235     int64_t segment_start;
 236
 237     /* the packet queue */
 238     AVPacket **packets;
 239     int num_packets;
 240     AVPacket *prev_pkt;
 241
 242     int done;
 243
 244     /* What to skip before effectively reading a packet. */
 245     int skip_to_keyframe;
 246     uint64_t skip_to_timecode;
 247
 248     /* File has a CUES element, but we defer parsing until it is needed. */
 249     int cues_parsing_deferred;
 250 } MatroskaDemuxContext;
 251
 252 typedef struct {
 253     uint64_t duration;
 254     int64_t  reference;
 255     uint64_t non_simple;
 256     EbmlBin  bin;
 257 } MatroskaBlock;
 258
 259 typedef struct {
 260     uint64_t timecode;
 261     EbmlList blocks;
 262 } MatroskaCluster;
 263
 264 static EbmlSyntax ebml_header[] = {
 265     { EBML_ID_EBMLREADVERSION,        EBML_UINT, 0, offsetof(Ebml,version), {.u=EBML_VERSION} },
 266     { EBML_ID_EBMLMAXSIZELENGTH,      EBML_UINT, 0, offsetof(Ebml,max_size), {.u=8} },
 267     { EBML_ID_EBMLMAXIDLENGTH,        EBML_UINT, 0, offsetof(Ebml,id_length), {.u=4} },
 268     { EBML_ID_DOCTYPE,                EBML_STR,  0, offsetof(Ebml,doctype), {.s="(none)"} },
 269     { EBML_ID_DOCTYPEREADVERSION,     EBML_UINT, 0, offsetof(Ebml,doctype_version), {.u=1} },
 270     { EBML_ID_EBMLVERSION,            EBML_NONE },
 271     { EBML_ID_DOCTYPEVERSION,         EBML_NONE },
 272     { 0 }
 273 };
 274
 275 static EbmlSyntax ebml_syntax[] = {
 276     { EBML_ID_HEADER,                 EBML_NEST, 0, 0, {.n=ebml_header} },
 277     { 0 }
 278 };
 279
 280 static EbmlSyntax matroska_info[] = {
 281     { MATROSKA_ID_TIMECODESCALE,      EBML_UINT,  0, offsetof(MatroskaDemuxContext,time_scale), {.u=1000000} },
 282     { MATROSKA_ID_DURATION,           EBML_FLOAT, 0, offsetof(MatroskaDemuxContext,duration) },
 283     { MATROSKA_ID_TITLE,              EBML_UTF8,  0, offsetof(MatroskaDemuxContext,title) },
 284     { MATROSKA_ID_WRITINGAPP,         EBML_NONE },
 285     { MATROSKA_ID_MUXINGAPP,          EBML_NONE },
 286     { MATROSKA_ID_DATEUTC,            EBML_NONE },
 287     { MATROSKA_ID_SEGMENTUID,         EBML_NONE },
 288     { 0 }
 289 };
 290
 291 static EbmlSyntax matroska_track_video[] = {
 292     { MATROSKA_ID_VIDEOFRAMERATE,     EBML_FLOAT,0, offsetof(MatroskaTrackVideo,frame_rate) },
 293     { MATROSKA_ID_VIDEODISPLAYWIDTH,  EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_width) },
 294     { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_height) },
 295     { MATROSKA_ID_VIDEOPIXELWIDTH,    EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_width) },
 296     { MATROSKA_ID_VIDEOPIXELHEIGHT,   EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_height) },
 297     { MATROSKA_ID_VIDEOCOLORSPACE,    EBML_UINT, 0, offsetof(MatroskaTrackVideo,fourcc) },
 298     { MATROSKA_ID_VIDEOPIXELCROPB,    EBML_NONE },
 299     { MATROSKA_ID_VIDEOPIXELCROPT,    EBML_NONE },
 300     { MATROSKA_ID_VIDEOPIXELCROPL,    EBML_NONE },
 301     { MATROSKA_ID_VIDEOPIXELCROPR,    EBML_NONE },
 302     { MATROSKA_ID_VIDEODISPLAYUNIT,   EBML_NONE },
 303     { MATROSKA_ID_VIDEOFLAGINTERLACED,EBML_NONE },
 304     { MATROSKA_ID_VIDEOSTEREOMODE,    EBML_NONE },
 305     { MATROSKA_ID_VIDEOASPECTRATIO,   EBML_NONE },
 306     { 0 }
 307 };
 308
 309 static EbmlSyntax matroska_track_audio[] = {
 310     { MATROSKA_ID_AUDIOSAMPLINGFREQ,  EBML_FLOAT,0, offsetof(MatroskaTrackAudio,samplerate), {.f=8000.0} },
 311     { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ,EBML_FLOAT,0,offsetof(MatroskaTrackAudio,out_samplerate) },
 312     { MATROSKA_ID_AUDIOBITDEPTH,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,bitdepth) },
 313     { MATROSKA_ID_AUDIOCHANNELS,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,channels), {.u=1} },
 314     { 0 }
 315 };
 316
 317 static EbmlSyntax matroska_track_encoding_compression[] = {
 318     { MATROSKA_ID_ENCODINGCOMPALGO,   EBML_UINT, 0, offsetof(MatroskaTrackCompression,algo), {.u=0} },
 319     { MATROSKA_ID_ENCODINGCOMPSETTINGS,EBML_BIN, 0, offsetof(MatroskaTrackCompression,settings) },
 320     { 0 }
 321 };
 322
 323 static EbmlSyntax matroska_track_encoding[] = {
 324     { MATROSKA_ID_ENCODINGSCOPE,      EBML_UINT, 0, offsetof(MatroskaTrackEncoding,scope), {.u=1} },
 325     { MATROSKA_ID_ENCODINGTYPE,       EBML_UINT, 0, offsetof(MatroskaTrackEncoding,type), {.u=0} },
 326     { MATROSKA_ID_ENCODINGCOMPRESSION,EBML_NEST, 0, offsetof(MatroskaTrackEncoding,compression), {.n=matroska_track_encoding_compression} },
 327     { MATROSKA_ID_ENCODINGORDER,      EBML_NONE },
 328     { 0 }
 329 };
 330
 331 static EbmlSyntax matroska_track_encodings[] = {
 332     { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack,encodings), {.n=matroska_track_encoding} },
 333     { 0 }
 334 };
 335
 336 static EbmlSyntax matroska_track[] = {
 337     { MATROSKA_ID_TRACKNUMBER,          EBML_UINT, 0, offsetof(MatroskaTrack,num) },
 338     { MATROSKA_ID_TRACKNAME,            EBML_UTF8, 0, offsetof(MatroskaTrack,name) },
 339     { MATROSKA_ID_TRACKUID,             EBML_UINT, 0, offsetof(MatroskaTrack,uid) },
 340     { MATROSKA_ID_TRACKTYPE,            EBML_UINT, 0, offsetof(MatroskaTrack,type) },
 341     { MATROSKA_ID_CODECID,              EBML_STR,  0, offsetof(MatroskaTrack,codec_id) },
 342     { MATROSKA_ID_CODECPRIVATE,         EBML_BIN,  0, offsetof(MatroskaTrack,codec_priv) },
 343     { MATROSKA_ID_TRACKLANGUAGE,        EBML_UTF8, 0, offsetof(MatroskaTrack,language), {.s="eng"} },
 344     { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack,default_duration) },
 345     { MATROSKA_ID_TRACKTIMECODESCALE,   EBML_FLOAT,0, offsetof(MatroskaTrack,time_scale), {.f=1.0} },
 346     { MATROSKA_ID_TRACKFLAGDEFAULT,     EBML_UINT, 0, offsetof(MatroskaTrack,flag_default), {.u=1} },
 347     { MATROSKA_ID_TRACKFLAGFORCED,      EBML_UINT, 0, offsetof(MatroskaTrack,flag_forced), {.u=0} },
 348     { MATROSKA_ID_TRACKVIDEO,           EBML_NEST, 0, offsetof(MatroskaTrack,video), {.n=matroska_track_video} },
 349     { MATROSKA_ID_TRACKAUDIO,           EBML_NEST, 0, offsetof(MatroskaTrack,audio), {.n=matroska_track_audio} },
 350     { MATROSKA_ID_TRACKCONTENTENCODINGS,EBML_NEST, 0, 0, {.n=matroska_track_encodings} },
 351     { MATROSKA_ID_TRACKFLAGENABLED,     EBML_NONE },
 352     { MATROSKA_ID_TRACKFLAGLACING,      EBML_NONE },
 353     { MATROSKA_ID_CODECNAME,            EBML_NONE },
 354     { MATROSKA_ID_CODECDECODEALL,       EBML_NONE },
 355     { MATROSKA_ID_CODECINFOURL,         EBML_NONE },
 356     { MATROSKA_ID_CODECDOWNLOADURL,     EBML_NONE },
 357     { MATROSKA_ID_TRACKMINCACHE,        EBML_NONE },
 358     { MATROSKA_ID_TRACKMAXCACHE,        EBML_NONE },
 359     { MATROSKA_ID_TRACKMAXBLKADDID,     EBML_NONE },
 360     { 0 }
 361 };
 362
 363 static EbmlSyntax matroska_tracks[] = {
 364     { MATROSKA_ID_TRACKENTRY,         EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext,tracks), {.n=matroska_track} },
 365     { 0 }
 366 };
 367
 368 static EbmlSyntax matroska_attachment[] = {
 369     { MATROSKA_ID_FILEUID,            EBML_UINT, 0, offsetof(MatroskaAttachement,uid) },
 370     { MATROSKA_ID_FILENAME,           EBML_UTF8, 0, offsetof(MatroskaAttachement,filename) },
 371     { MATROSKA_ID_FILEMIMETYPE,       EBML_STR,  0, offsetof(MatroskaAttachement,mime) },
 372     { MATROSKA_ID_FILEDATA,           EBML_BIN,  0, offsetof(MatroskaAttachement,bin) },
 373     { MATROSKA_ID_FILEDESC,           EBML_NONE },
 374     { 0 }
 375 };
 376
 377 static EbmlSyntax matroska_attachments[] = {
 378     { MATROSKA_ID_ATTACHEDFILE,       EBML_NEST, sizeof(MatroskaAttachement), offsetof(MatroskaDemuxContext,attachments), {.n=matroska_attachment} },
 379     { 0 }
 380 };
 381
 382 static EbmlSyntax matroska_chapter_display[] = {
 383     { MATROSKA_ID_CHAPSTRING,         EBML_UTF8, 0, offsetof(MatroskaChapter,title) },
 384     { MATROSKA_ID_CHAPLANG,           EBML_NONE },
 385     { 0 }
 386 };
 387
 388 static EbmlSyntax matroska_chapter_entry[] = {
 389     { MATROSKA_ID_CHAPTERTIMESTART,   EBML_UINT, 0, offsetof(MatroskaChapter,start), {.u=AV_NOPTS_VALUE} },
 390     { MATROSKA_ID_CHAPTERTIMEEND,     EBML_UINT, 0, offsetof(MatroskaChapter,end), {.u=AV_NOPTS_VALUE} },
 391     { MATROSKA_ID_CHAPTERUID,         EBML_UINT, 0, offsetof(MatroskaChapter,uid) },
 392     { MATROSKA_ID_CHAPTERDISPLAY,     EBML_NEST, 0, 0, {.n=matroska_chapter_display} },
 393     { MATROSKA_ID_CHAPTERFLAGHIDDEN,  EBML_NONE },
 394     { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
 395     { MATROSKA_ID_CHAPTERPHYSEQUIV,   EBML_NONE },
 396     { MATROSKA_ID_CHAPTERATOM,        EBML_NONE },
 397     { 0 }
 398 };
 399
 400 static EbmlSyntax matroska_chapter[] = {
 401     { MATROSKA_ID_CHAPTERATOM,        EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext,chapters), {.n=matroska_chapter_entry} },
 402     { MATROSKA_ID_EDITIONUID,         EBML_NONE },
 403     { MATROSKA_ID_EDITIONFLAGHIDDEN,  EBML_NONE },
 404     { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
 405     { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
 406     { 0 }
 407 };
 408
 409 static EbmlSyntax matroska_chapters[] = {
 410     { MATROSKA_ID_EDITIONENTRY,       EBML_NEST, 0, 0, {.n=matroska_chapter} },
 411     { 0 }
 412 };
 413
 414 static EbmlSyntax matroska_index_pos[] = {
 415     { MATROSKA_ID_CUETRACK,           EBML_UINT, 0, offsetof(MatroskaIndexPos,track) },
 416     { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos,pos)   },
 417     { MATROSKA_ID_CUEBLOCKNUMBER,     EBML_NONE },
 418     { 0 }
 419 };
 420
 421 static EbmlSyntax matroska_index_entry[] = {
 422     { MATROSKA_ID_CUETIME,            EBML_UINT, 0, offsetof(MatroskaIndex,time) },
 423     { MATROSKA_ID_CUETRACKPOSITION,   EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex,pos), {.n=matroska_index_pos} },
 424     { 0 }
 425 };
 426
 427 static EbmlSyntax matroska_index[] = {
 428     { MATROSKA_ID_POINTENTRY,         EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext,index), {.n=matroska_index_entry} },
 429     { 0 }
 430 };
 431
 432 static EbmlSyntax matroska_simpletag[] = {
 433     { MATROSKA_ID_TAGNAME,            EBML_UTF8, 0, offsetof(MatroskaTag,name) },
 434     { MATROSKA_ID_TAGSTRING,          EBML_UTF8, 0, offsetof(MatroskaTag,string) },
 435     { MATROSKA_ID_TAGLANG,            EBML_STR,  0, offsetof(MatroskaTag,lang), {.s="und"} },
 436     { MATROSKA_ID_TAGDEFAULT,         EBML_UINT, 0, offsetof(MatroskaTag,def) },
 437     { MATROSKA_ID_TAGDEFAULT_BUG,     EBML_UINT, 0, offsetof(MatroskaTag,def) },
 438     { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag,sub), {.n=matroska_simpletag} },
 439     { 0 }
 440 };
 441
 442 static EbmlSyntax matroska_tagtargets[] = {
 443     { MATROSKA_ID_TAGTARGETS_TYPE,      EBML_STR,  0, offsetof(MatroskaTagTarget,type) },
 444     { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget,typevalue), {.u=50} },
 445     { MATROSKA_ID_TAGTARGETS_TRACKUID,  EBML_UINT, 0, offsetof(MatroskaTagTarget,trackuid) },
 446     { MATROSKA_ID_TAGTARGETS_CHAPTERUID,EBML_UINT, 0, offsetof(MatroskaTagTarget,chapteruid) },
 447     { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget,attachuid) },
 448     { 0 }
 449 };
 450
 451 static EbmlSyntax matroska_tag[] = {
 452     { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags,tag), {.n=matroska_simpletag} },
 453     { MATROSKA_ID_TAGTARGETS,         EBML_NEST, 0, offsetof(MatroskaTags,target), {.n=matroska_tagtargets} },
 454     { 0 }
 455 };
 456
 457 static EbmlSyntax matroska_tags[] = {
 458     { MATROSKA_ID_TAG,                EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext,tags), {.n=matroska_tag} },
 459     { 0 }
 460 };
 461
 462 static EbmlSyntax matroska_seekhead_entry[] = {
 463     { MATROSKA_ID_SEEKID,             EBML_UINT, 0, offsetof(MatroskaSeekhead,id) },
 464     { MATROSKA_ID_SEEKPOSITION,       EBML_UINT, 0, offsetof(MatroskaSeekhead,pos), {.u=-1} },
 465     { 0 }
 466 };
 467
 468 static EbmlSyntax matroska_seekhead[] = {
 469     { MATROSKA_ID_SEEKENTRY,          EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext,seekhead), {.n=matroska_seekhead_entry} },
 470     { 0 }
 471 };
 472
 473 static EbmlSyntax matroska_segment[] = {
 474     { MATROSKA_ID_INFO,           EBML_NEST, 0, 0, {.n=matroska_info       } },
 475     { MATROSKA_ID_TRACKS,         EBML_NEST, 0, 0, {.n=matroska_tracks     } },
 476     { MATROSKA_ID_ATTACHMENTS,    EBML_NEST, 0, 0, {.n=matroska_attachments} },
 477     { MATROSKA_ID_CHAPTERS,       EBML_NEST, 0, 0, {.n=matroska_chapters   } },
 478     { MATROSKA_ID_CUES,           EBML_NEST, 0, 0, {.n=matroska_index      } },
 479     { MATROSKA_ID_TAGS,           EBML_NEST, 0, 0, {.n=matroska_tags       } },
 480     { MATROSKA_ID_SEEKHEAD,       EBML_NEST, 0, 0, {.n=matroska_seekhead   } },
 481     { MATROSKA_ID_CLUSTER,        EBML_STOP },
 482     { 0 }
 483 };
 484
 485 static EbmlSyntax matroska_segments[] = {
 486     { MATROSKA_ID_SEGMENT,        EBML_NEST, 0, 0, {.n=matroska_segment    } },
 487     { 0 }
 488 };
 489
 490 static EbmlSyntax matroska_blockgroup[] = {
 491     { MATROSKA_ID_BLOCK,          EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
 492     { MATROSKA_ID_SIMPLEBLOCK,    EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
 493     { MATROSKA_ID_BLOCKDURATION,  EBML_UINT, 0, offsetof(MatroskaBlock,duration), {.u=AV_NOPTS_VALUE} },
 494     { MATROSKA_ID_BLOCKREFERENCE, EBML_UINT, 0, offsetof(MatroskaBlock,reference) },
 495     { 1,                          EBML_UINT, 0, offsetof(MatroskaBlock,non_simple), {.u=1} },
 496     { 0 }
 497 };
 498
 499 static EbmlSyntax matroska_cluster[] = {
 500     { MATROSKA_ID_CLUSTERTIMECODE,EBML_UINT,0, offsetof(MatroskaCluster,timecode) },
 501     { MATROSKA_ID_BLOCKGROUP,     EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
 502     { MATROSKA_ID_SIMPLEBLOCK,    EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
 503     { MATROSKA_ID_CLUSTERPOSITION,EBML_NONE },
 504     { MATROSKA_ID_CLUSTERPREVSIZE,EBML_NONE },
 505     { 0 }
 506 };
 507
 508 static EbmlSyntax matroska_clusters[] = {
 509     { MATROSKA_ID_CLUSTER,        EBML_NEST, 0, 0, {.n=matroska_cluster} },
 510     { MATROSKA_ID_INFO,           EBML_NONE },
 511     { MATROSKA_ID_CUES,           EBML_NONE },
 512     { MATROSKA_ID_TAGS,           EBML_NONE },
 513     { MATROSKA_ID_SEEKHEAD,       EBML_NONE },
 514     { 0 }
 515 };
 516
 517 static const char *matroska_doctypes[] = { "matroska", "webm" };
 518
 519 /*
 520  * Return: Whether we reached the end of a level in the hierarchy or not.
 521  */
 522 static int ebml_level_end(MatroskaDemuxContext *matroska)
 523 {
 524     AVIOContext *pb = matroska->ctx->pb;
 525     int64_t pos = avio_tell(pb);
 526
 527     if (matroska->num_levels > 0) {
 528         MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
 529         if (pos - level->start >= level->length || matroska->current_id) {
 530             matroska->num_levels--;
 531             return 1;
 532         }
 533     }
 534     return 0;
 535 }
 536
 537 /*
 538  * Read: an "EBML number", which is defined as a variable-length
 539  * array of bytes. The first byte indicates the length by giving a
 540  * number of 0-bits followed by a one. The position of the first
 541  * "one" bit inside the first byte indicates the length of this
 542  * number.
 543  * Returns: number of bytes read, < 0 on error
 544  */
 545 static int ebml_read_num(MatroskaDemuxContext *matroska, AVIOContext *pb,
 546                          int max_size, uint64_t *number)
 547 {
 548     int read = 1, n = 1;
 549     uint64_t total = 0;
 550
 551     /* The first byte tells us the length in bytes - avio_r8() can normally
 552      * return 0, but since that's not a valid first ebmlID byte, we can
 553      * use it safely here to catch EOS. */
 554     if (!(total = avio_r8(pb))) {
 555         /* we might encounter EOS here */
 556         if (!pb->eof_reached) {
 557             int64_t pos = avio_tell(pb);
 558             av_log(matroska->ctx, AV_LOG_ERROR,
 559                    "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
 560                    pos, pos);
 561         }
 562         return AVERROR(EIO); /* EOS or actual I/O error */
 563     }
 564
 565     /* get the length of the EBML number */
 566     read = 8 - ff_log2_tab[total];
 567     if (read > max_size) {
 568         int64_t pos = avio_tell(pb) - 1;
 569         av_log(matroska->ctx, AV_LOG_ERROR,
 570                "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
 571                (uint8_t) total, pos, pos);
 572         return AVERROR_INVALIDDATA;
 573     }
 574
 575     /* read out length */
 576     total ^= 1 << ff_log2_tab[total];
 577     while (n++ < read)
 578         total = (total << 8) | avio_r8(pb);
 579
 580     *number = total;
 581
 582     return read;
 583 }
 584
 585 /**
 586  * Read a EBML length value.
 587  * This needs special handling for the "unknown length" case which has multiple
 588  * encodings.
 589  */
 590 static int ebml_read_length(MatroskaDemuxContext *matroska, AVIOContext *pb,
 591                             uint64_t *number)
 592 {
 593     int res = ebml_read_num(matroska, pb, 8, number);
 594     if (res > 0 && *number + 1 == 1ULL << (7 * res))
 595         *number = 0xffffffffffffffULL;
 596     return res;
 597 }
 598
 599 /*
 600  * Read the next element as an unsigned int.
 601  * 0 is success, < 0 is failure.
 602  */
 603 static int ebml_read_uint(AVIOContext *pb, int size, uint64_t *num)
 604 {
 605     int n = 0;
 606
 607     if (size > 8)
 608         return AVERROR_INVALIDDATA;
 609
 610     /* big-endian ordering; build up number */
 611     *num = 0;
 612     while (n++ < size)
 613         *num = (*num << 8) | avio_r8(pb);
 614
 615     return 0;
 616 }
 617
 618 /*
 619  * Read the next element as a float.
 620  * 0 is success, < 0 is failure.
 621  */
 622 static int ebml_read_float(AVIOContext *pb, int size, double *num)
 623 {
 624     if (size == 0) {
 625         *num = 0;
 626     } else if (size == 4) {
 627         *num= av_int2flt(avio_rb32(pb));
 628     } else if(size==8){
 629         *num= av_int2dbl(avio_rb64(pb));
 630     } else
 631         return AVERROR_INVALIDDATA;
 632
 633     return 0;
 634 }
 635
 636 /*
 637  * Read the next element as an ASCII string.
 638  * 0 is success, < 0 is failure.
 639  */
 640 static int ebml_read_ascii(AVIOContext *pb, int size, char **str)
 641 {
 642     av_free(*str);
 643     /* EBML strings are usually not 0-terminated, so we allocate one
 644      * byte more, read the string and NULL-terminate it ourselves. */
 645     if (!(*str = av_malloc(size + 1)))
 646         return AVERROR(ENOMEM);
 647     if (avio_read(pb, (uint8_t *) *str, size) != size) {
 648         av_freep(str);
 649         return AVERROR(EIO);
 650     }
 651     (*str)[size] = '\0';
 652
 653     return 0;
 654 }
 655
 656 /*
 657  * Read the next element as binary data.
 658  * 0 is success, < 0 is failure.
 659  */
 660 static int ebml_read_binary(AVIOContext *pb, int length, EbmlBin *bin)
 661 {
 662     av_free(bin->data);
 663     if (!(bin->data = av_malloc(length)))
 664         return AVERROR(ENOMEM);
 665
 666     bin->size = length;
 667     bin->pos  = avio_tell(pb);
 668     if (avio_read(pb, bin->data, length) != length) {
 669         av_freep(&bin->data);
 670         return AVERROR(EIO);
 671     }
 672
 673     return 0;
 674 }
 675
 676 /*
 677  * Read the next element, but only the header. The contents
 678  * are supposed to be sub-elements which can be read separately.
 679  * 0 is success, < 0 is failure.
 680  */
 681 static int ebml_read_master(MatroskaDemuxContext *matroska, uint64_t length)
 682 {
 683     AVIOContext *pb = matroska->ctx->pb;
 684     MatroskaLevel *level;
 685
 686     if (matroska->num_levels >= EBML_MAX_DEPTH) {
 687         av_log(matroska->ctx, AV_LOG_ERROR,
 688                "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
 689         return AVERROR(ENOSYS);
 690     }
 691
 692     level = &matroska->levels[matroska->num_levels++];
 693     level->start = avio_tell(pb);
 694     level->length = length;
 695
 696     return 0;
 697 }
 698
 699 /*
 700  * Read signed/unsigned "EBML" numbers.
 701  * Return: number of bytes processed, < 0 on error
 702  */
 703 static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
 704                                  uint8_t *data, uint32_t size, uint64_t *num)
 705 {
 706     AVIOContext pb;
 707     ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL);
 708     return ebml_read_num(matroska, &pb, FFMIN(size, 8), num);
 709 }
 710
 711 /*
 712  * Same as above, but signed.
 713  */
 714 static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
 715                                  uint8_t *data, uint32_t size, int64_t *num)
 716 {
 717     uint64_t unum;
 718     int res;
 719
 720     /* read as unsigned number first */
 721     if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
 722         return res;
 723
 724     /* make signed (weird way) */
 725     *num = unum - ((1LL << (7*res - 1)) - 1);
 726
 727     return res;
 728 }
 729
 730 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
 731                            EbmlSyntax *syntax, void *data);
 732
 733 static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
 734                          uint32_t id, void *data)
 735 {
 736     int i;
 737     for (i=0; syntax[i].id; i++)
 738         if (id == syntax[i].id)
 739             break;
 740     if (!syntax[i].id && id == MATROSKA_ID_CLUSTER &&
 741         matroska->num_levels > 0 &&
 742         matroska->levels[matroska->num_levels-1].length == 0xffffffffffffff)
 743         return 0;  // we reached the end of an unknown size cluster
 744     if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32)
 745         av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
 746     return ebml_parse_elem(matroska, &syntax[i], data);
 747 }
 748
 749 static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
 750                       void *data)
 751 {
 752     if (!matroska->current_id) {
 753         uint64_t id;
 754         int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
 755         if (res < 0)
 756             return res;
 757         matroska->current_id = id | 1 << 7*res;
 758     }
 759     return ebml_parse_id(matroska, syntax, matroska->current_id, data);
 760 }
 761
 762 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
 763                            void *data)
 764 {
 765     int i, res = 0;
 766
 767     for (i=0; syntax[i].id; i++)
 768         switch (syntax[i].type) {
 769         case EBML_UINT:
 770             *(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
 771             break;
 772         case EBML_FLOAT:
 773             *(double   *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
 774             break;
 775         case EBML_STR:
 776         case EBML_UTF8:
 777             *(char    **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
 778             break;
 779         }
 780
 781     while (!res && !ebml_level_end(matroska))
 782         res = ebml_parse(matroska, syntax, data);
 783
 784     return res;
 785 }
 786
 787 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
 788                            EbmlSyntax *syntax, void *data)
 789 {
 790     static const uint64_t max_lengths[EBML_TYPE_COUNT] = {
 791         [EBML_UINT]  = 8,
 792         [EBML_FLOAT] = 8,
 793         // max. 16 MB for strings
 794         [EBML_STR]   = 0x1000000,
 795         [EBML_UTF8]  = 0x1000000,
 796         // max. 256 MB for binary data
 797         [EBML_BIN]   = 0x10000000,
 798         // no limits for anything else
 799     };
 800     AVIOContext *pb = matroska->ctx->pb;
 801     uint32_t id = syntax->id;
 802     uint64_t length;
 803     int res;
 804
 805     data = (char *)data + syntax->data_offset;
 806     if (syntax->list_elem_size) {
 807         EbmlList *list = data;
 808         list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
 809         data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
 810         memset(data, 0, syntax->list_elem_size);
 811         list->nb_elem++;
 812     }
 813
 814     if (syntax->type != EBML_PASS && syntax->type != EBML_STOP) {
 815         matroska->current_id = 0;
 816         if ((res = ebml_read_length(matroska, pb, &length)) < 0)
 817             return res;
 818         if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) {
 819             av_log(matroska->ctx, AV_LOG_ERROR,
 820                    "Invalid length 0x%"PRIx64" > 0x%"PRIx64" for syntax element %i\n",
 821                    length, max_lengths[syntax->type], syntax->type);
 822             return AVERROR_INVALIDDATA;
 823         }
 824     }
 825
 826     switch (syntax->type) {
 827     case EBML_UINT:  res = ebml_read_uint  (pb, length, data);  break;
 828     case EBML_FLOAT: res = ebml_read_float (pb, length, data);  break;
 829     case EBML_STR:
 830     case EBML_UTF8:  res = ebml_read_ascii (pb, length, data);  break;
 831     case EBML_BIN:   res = ebml_read_binary(pb, length, data);  break;
 832     case EBML_NEST:  if ((res=ebml_read_master(matroska, length)) < 0)
 833                          return res;
 834                      if (id == MATROSKA_ID_SEGMENT)
 835                          matroska->segment_start = avio_tell(matroska->ctx->pb);
 836                      return ebml_parse_nest(matroska, syntax->def.n, data);
 837     case EBML_PASS:  return ebml_parse_id(matroska, syntax->def.n, id, data);
 838     case EBML_STOP:  return 1;
 839     default:         return avio_skip(pb,length)<0 ? AVERROR(EIO) : 0;
 840     }
 841     if (res == AVERROR_INVALIDDATA)
 842         av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
 843     else if (res == AVERROR(EIO))
 844         av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
 845     return res;
 846 }
 847
 848 static void ebml_free(EbmlSyntax *syntax, void *data)
 849 {
 850     int i, j;
 851     for (i=0; syntax[i].id; i++) {
 852         void *data_off = (char *)data + syntax[i].data_offset;
 853         switch (syntax[i].type) {
 854         case EBML_STR:
 855         case EBML_UTF8:  av_freep(data_off);                      break;
 856         case EBML_BIN:   av_freep(&((EbmlBin *)data_off)->data);  break;
 857         case EBML_NEST:
 858             if (syntax[i].list_elem_size) {
 859                 EbmlList *list = data_off;
 860                 char *ptr = list->elem;
 861                 for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
 862                     ebml_free(syntax[i].def.n, ptr);
 863                 av_free(list->elem);
 864             } else
 865                 ebml_free(syntax[i].def.n, data_off);
 866         default:  break;
 867         }
 868     }
 869 }
 870
 871
 872 /*
 873  * Autodetecting...
 874  */
 875 static int matroska_probe(AVProbeData *p)
 876 {
 877     uint64_t total = 0;
 878     int len_mask = 0x80, size = 1, n = 1, i;
 879
 880     /* EBML header? */
 881     if (AV_RB32(p->buf) != EBML_ID_HEADER)
 882         return 0;
 883
 884     /* length of header */
 885     total = p->buf[4];
 886     while (size <= 8 && !(total & len_mask)) {
 887         size++;
 888         len_mask >>= 1;
 889     }
 890     if (size > 8)
 891       return 0;
 892     total &= (len_mask - 1);
 893     while (n < size)
 894         total = (total << 8) | p->buf[4 + n++];
 895
 896     /* Does the probe data contain the whole header? */
 897     if (p->buf_size < 4 + size + total)
 898       return 0;
 899
 900     /* The header should contain a known document type. For now,
 901      * we don't parse the whole header but simply check for the
 902      * availability of that array of characters inside the header.
 903      * Not fully fool-proof, but good enough. */
 904     for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
 905         int probelen = strlen(matroska_doctypes[i]);
 906         for (n = 4+size; n <= 4+size+total-probelen; n++)
 907             if (!memcmp(p->buf+n, matroska_doctypes[i], probelen))
 908                 return AVPROBE_SCORE_MAX;
 909     }
 910
 911     // probably valid EBML header but no recognized doctype
 912     return AVPROBE_SCORE_MAX/2;
 913 }
 914
 915 static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
 916                                                  int num)
 917 {
 918     MatroskaTrack *tracks = matroska->tracks.elem;
 919     int i;
 920
 921     for (i=0; i < matroska->tracks.nb_elem; i++)
 922         if (tracks[i].num == num)
 923             return &tracks[i];
 924
 925     av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
 926     return NULL;
 927 }
 928
 929 static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
 930                                   MatroskaTrack *track)
 931 {
 932     MatroskaTrackEncoding *encodings = track->encodings.elem;
 933     uint8_t* data = *buf;
 934     int isize = *buf_size;
 935     uint8_t* pkt_data = NULL;
 936     int pkt_size = isize;
 937     int result = 0;
 938     int olen;
 939
 940     if (pkt_size >= 10000000)
 941         return -1;
 942
 943     switch (encodings[0].compression.algo) {
 944     case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
 945         return encodings[0].compression.settings.size;
 946     case MATROSKA_TRACK_ENCODING_COMP_LZO:
 947         do {
 948             olen = pkt_size *= 3;
 949             pkt_data = av_realloc(pkt_data, pkt_size+AV_LZO_OUTPUT_PADDING);
 950             result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
 951         } while (result==AV_LZO_OUTPUT_FULL && pkt_size<10000000);
 952         if (result)
 953             goto failed;
 954         pkt_size -= olen;
 955         break;
 956 #if CONFIG_ZLIB
 957     case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
 958         z_stream zstream = {0};
 959         if (inflateInit(&zstream) != Z_OK)
 960             return -1;
 961         zstream.next_in = data;
 962         zstream.avail_in = isize;
 963         do {
 964             pkt_size *= 3;
 965             pkt_data = av_realloc(pkt_data, pkt_size);
 966             zstream.avail_out = pkt_size - zstream.total_out;
 967             zstream.next_out = pkt_data + zstream.total_out;
 968             result = inflate(&zstream, Z_NO_FLUSH);
 969         } while (result==Z_OK && pkt_size<10000000);
 970         pkt_size = zstream.total_out;
 971         inflateEnd(&zstream);
 972         if (result != Z_STREAM_END)
 973             goto failed;
 974         break;
 975     }
 976 #endif
 977 #if CONFIG_BZLIB
 978     case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
 979         bz_stream bzstream = {0};
 980         if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
 981             return -1;
 982         bzstream.next_in = data;
 983         bzstream.avail_in = isize;
 984         do {
 985             pkt_size *= 3;
 986             pkt_data = av_realloc(pkt_data, pkt_size);
 987             bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
 988             bzstream.next_out = pkt_data + bzstream.total_out_lo32;
 989             result = BZ2_bzDecompress(&bzstream);
 990         } while (result==BZ_OK && pkt_size<10000000);
 991         pkt_size = bzstream.total_out_lo32;
 992         BZ2_bzDecompressEnd(&bzstream);
 993         if (result != BZ_STREAM_END)
 994             goto failed;
 995         break;
 996     }
 997 #endif
 998     default:
 999         return -1;
1000     }
1001
1002     *buf = pkt_data;
1003     *buf_size = pkt_size;
1004     return 0;
1005  failed:
1006     av_free(pkt_data);
1007     return -1;
1008 }
1009
1010 static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
1011                                     AVPacket *pkt, uint64_t display_duration)
1012 {
1013     char *line, *layer, *ptr = pkt->data, *end = ptr+pkt->size;
1014     for (; *ptr!=',' && ptr<end-1; ptr++);
1015     if (*ptr == ',')
1016         layer = ++ptr;
1017     for (; *ptr!=',' && ptr<end-1; ptr++);
1018     if (*ptr == ',') {
1019         int64_t end_pts = pkt->pts + display_duration;
1020         int sc = matroska->time_scale * pkt->pts / 10000000;
1021         int ec = matroska->time_scale * end_pts  / 10000000;
1022         int sh, sm, ss, eh, em, es, len;
1023         sh = sc/360000;  sc -= 360000*sh;
1024         sm = sc/  6000;  sc -=   6000*sm;
1025         ss = sc/   100;  sc -=    100*ss;
1026         eh = ec/360000;  ec -= 360000*eh;
1027         em = ec/  6000;  ec -=   6000*em;
1028         es = ec/   100;  ec -=    100*es;
1029         *ptr++ = '\0';
1030         len = 50 + end-ptr + FF_INPUT_BUFFER_PADDING_SIZE;
1031         if (!(line = av_malloc(len)))
1032             return;
1033         snprintf(line,len,"Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
1034                  layer, sh, sm, ss, sc, eh, em, es, ec, ptr);
1035         av_free(pkt->data);
1036         pkt->data = line;
1037         pkt->size = strlen(line);
1038     }
1039 }
1040
1041 static void matroska_merge_packets(AVPacket *out, AVPacket *in)
1042 {
1043     out->data = av_realloc(out->data, out->size+in->size);
1044     memcpy(out->data+out->size, in->data, in->size);
1045     out->size += in->size;
1046     av_destruct_packet(in);
1047     av_free(in);
1048 }
1049
1050 static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
1051                                  AVDictionary **metadata, char *prefix)
1052 {
1053     MatroskaTag *tags = list->elem;
1054     char key[1024];
1055     int i;
1056
1057     for (i=0; i < list->nb_elem; i++) {
1058         const char *lang = strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1059
1060         if (!tags[i].name) {
1061             av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");
1062             continue;
1063         }
1064         if (prefix)  snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1065         else         av_strlcpy(key, tags[i].name, sizeof(key));
1066         if (tags[i].def || !lang) {
1067         av_dict_set(metadata, key, tags[i].string, 0);
1068         if (tags[i].sub.nb_elem)
1069             matroska_convert_tag(s, &tags[i].sub, metadata, key);
1070         }
1071         if (lang) {
1072             av_strlcat(key, "-", sizeof(key));
1073             av_strlcat(key, lang, sizeof(key));
1074             av_dict_set(metadata, key, tags[i].string, 0);
1075             if (tags[i].sub.nb_elem)
1076                 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1077         }
1078     }
1079     ff_metadata_conv(metadata, NULL, ff_mkv_metadata_conv);
1080 }
1081
1082 static void matroska_convert_tags(AVFormatContext *s)
1083 {
1084     MatroskaDemuxContext *matroska = s->priv_data;
1085     MatroskaTags *tags = matroska->tags.elem;
1086     int i, j;
1087
1088     for (i=0; i < matroska->tags.nb_elem; i++) {
1089         if (tags[i].target.attachuid) {
1090             MatroskaAttachement *attachment = matroska->attachments.elem;
1091             for (j=0; j<matroska->attachments.nb_elem; j++)
1092                 if (attachment[j].uid == tags[i].target.attachuid
1093                     && attachment[j].stream)
1094                     matroska_convert_tag(s, &tags[i].tag,
1095                                          &attachment[j].stream->metadata, NULL);
1096         } else if (tags[i].target.chapteruid) {
1097             MatroskaChapter *chapter = matroska->chapters.elem;
1098             for (j=0; j<matroska->chapters.nb_elem; j++)
1099                 if (chapter[j].uid == tags[i].target.chapteruid
1100                     && chapter[j].chapter)
1101                     matroska_convert_tag(s, &tags[i].tag,
1102                                          &chapter[j].chapter->metadata, NULL);
1103         } else if (tags[i].target.trackuid) {
1104             MatroskaTrack *track = matroska->tracks.elem;
1105             for (j=0; j<matroska->tracks.nb_elem; j++)
1106                 if (track[j].uid == tags[i].target.trackuid && track[j].stream)
1107                     matroska_convert_tag(s, &tags[i].tag,
1108                                          &track[j].stream->metadata, NULL);
1109         } else {
1110             matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1111                                  tags[i].target.type);
1112         }
1113     }
1114 }
1115
1116 static int matroska_parse_seekhead_entry(MatroskaDemuxContext *matroska, int idx)
1117 {
1118     EbmlList *seekhead_list = &matroska->seekhead;
1119     MatroskaSeekhead *seekhead = seekhead_list->elem;
1120     uint32_t level_up = matroska->level_up;
1121     int64_t before_pos = avio_tell(matroska->ctx->pb);
1122     uint32_t saved_id = matroska->current_id;
1123     MatroskaLevel level;
1124     int64_t offset;
1125     int ret = 0;
1126
1127     if (idx >= seekhead_list->nb_elem
1128             || seekhead[idx].id == MATROSKA_ID_SEEKHEAD
1129             || seekhead[idx].id == MATROSKA_ID_CLUSTER)
1130         return 0;
1131
1132     /* seek */
1133     offset = seekhead[idx].pos + matroska->segment_start;
1134     if (avio_seek(matroska->ctx->pb, offset, SEEK_SET) == offset) {
1135         /* We don't want to lose our seekhead level, so we add
1136          * a dummy. This is a crude hack. */
1137         if (matroska->num_levels == EBML_MAX_DEPTH) {
1138             av_log(matroska->ctx, AV_LOG_INFO,
1139                    "Max EBML element depth (%d) reached, "
1140                    "cannot parse further.\n", EBML_MAX_DEPTH);
1141             ret = AVERROR_INVALIDDATA;
1142         } else {
1143             level.start = 0;
1144             level.length = (uint64_t)-1;
1145             matroska->levels[matroska->num_levels] = level;
1146             matroska->num_levels++;
1147             matroska->current_id = 0;
1148
1149             ebml_parse(matroska, matroska_segment, matroska);
1150
1151             /* remove dummy level */
1152             while (matroska->num_levels) {
1153                 uint64_t length = matroska->levels[--matroska->num_levels].length;
1154                 if (length == (uint64_t)-1)
1155                     break;
1156             }
1157         }
1158     }
1159     /* seek back */
1160     avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
1161     matroska->level_up = level_up;
1162     matroska->current_id = saved_id;
1163
1164     return ret;
1165 }
1166
1167 static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1168 {
1169     EbmlList *seekhead_list = &matroska->seekhead;
1170     MatroskaSeekhead *seekhead = seekhead_list->elem;
1171     int64_t before_pos = avio_tell(matroska->ctx->pb);
1172     int i;
1173
1174     // we should not do any seeking in the streaming case
1175     if (!matroska->ctx->pb->seekable ||
1176         (matroska->ctx->flags & AVFMT_FLAG_IGNIDX))
1177         return;
1178
1179     for (i = 0; i < seekhead_list->nb_elem; i++) {
1180         if (seekhead[i].pos <= before_pos)
1181             continue;
1182
1183         // defer cues parsing until we actually need cue data.
1184         if (seekhead[i].id == MATROSKA_ID_CUES) {
1185             matroska->cues_parsing_deferred = 1;
1186             continue;
1187         }
1188
1189         if (matroska_parse_seekhead_entry(matroska, i) < 0)
1190             break;
1191     }
1192 }
1193
1194 static void matroska_parse_cues(MatroskaDemuxContext *matroska) {
1195     EbmlList *seekhead_list = &matroska->seekhead;
1196     MatroskaSeekhead *seekhead = seekhead_list->elem;
1197     EbmlList *index_list;
1198     MatroskaIndex *index;
1199     int index_scale = 1;
1200     int i, j;
1201
1202     for (i = 0; i < seekhead_list->nb_elem; i++)
1203         if (seekhead[i].id == MATROSKA_ID_CUES)
1204             break;
1205     assert(i <= seekhead_list->nb_elem);
1206
1207     matroska_parse_seekhead_entry(matroska, i);
1208
1209     index_list = &matroska->index;
1210     index = index_list->elem;
1211     if (index_list->nb_elem
1212         && index[0].time > 1E14/matroska->time_scale) {
1213         av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
1214         index_scale = matroska->time_scale;
1215     }
1216     for (i = 0; i < index_list->nb_elem; i++) {
1217         EbmlList *pos_list = &index[i].pos;
1218         MatroskaIndexPos *pos = pos_list->elem;
1219         for (j = 0; j < pos_list->nb_elem; j++) {
1220             MatroskaTrack *track = matroska_find_track_by_num(matroska, pos[j].track);
1221             if (track && track->stream)
1222                 av_add_index_entry(track->stream,
1223                                    pos[j].pos + matroska->segment_start,
1224                                    index[i].time/index_scale, 0, 0,
1225                                    AVINDEX_KEYFRAME);
1226         }
1227     }
1228 }
1229
1230 static int matroska_aac_profile(char *codec_id)
1231 {
1232     static const char * const aac_profiles[] = { "MAIN", "LC", "SSR" };
1233     int profile;
1234
1235     for (profile=0; profile<FF_ARRAY_ELEMS(aac_profiles); profile++)
1236         if (strstr(codec_id, aac_profiles[profile]))
1237             break;
1238     return profile + 1;
1239 }
1240
1241 static int matroska_aac_sri(int samplerate)
1242 {
1243     int sri;
1244
1245     for (sri=0; sri<FF_ARRAY_ELEMS(ff_mpeg4audio_sample_rates); sri++)
1246         if (ff_mpeg4audio_sample_rates[sri] == samplerate)
1247             break;
1248     return sri;
1249 }
1250
1251 static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
1252 {
1253     MatroskaDemuxContext *matroska = s->priv_data;
1254     EbmlList *attachements_list = &matroska->attachments;
1255     MatroskaAttachement *attachements;
1256     EbmlList *chapters_list = &matroska->chapters;
1257     MatroskaChapter *chapters;
1258     MatroskaTrack *tracks;
1259     uint64_t max_start = 0;
1260     Ebml ebml = { 0 };
1261     AVStream *st;
1262     int i, j, res;
1263
1264     matroska->ctx = s;
1265
1266     /* First read the EBML header. */
1267     if (ebml_parse(matroska, ebml_syntax, &ebml)
1268         || ebml.version > EBML_VERSION       || ebml.max_size > sizeof(uint64_t)
1269         || ebml.id_length > sizeof(uint32_t) || ebml.doctype_version > 2) {
1270         av_log(matroska->ctx, AV_LOG_ERROR,
1271                "EBML header using unsupported features\n"
1272                "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
1273                ebml.version, ebml.doctype, ebml.doctype_version);
1274         ebml_free(ebml_syntax, &ebml);
1275         return AVERROR_PATCHWELCOME;
1276     }
1277     for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
1278         if (!strcmp(ebml.doctype, matroska_doctypes[i]))
1279             break;
1280     if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
1281         av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
1282     }
1283     ebml_free(ebml_syntax, &ebml);
1284
1285     /* The next thing is a segment. */
1286     if ((res = ebml_parse(matroska, matroska_segments, matroska)) < 0)
1287         return res;
1288     matroska_execute_seekhead(matroska);
1289
1290     if (!matroska->time_scale)
1291         matroska->time_scale = 1000000;
1292     if (matroska->duration)
1293         matroska->ctx->duration = matroska->duration * matroska->time_scale
1294                                   * 1000 / AV_TIME_BASE;
1295     av_dict_set(&s->metadata, "title", matroska->title, 0);
1296
1297     tracks = matroska->tracks.elem;
1298     for (i=0; i < matroska->tracks.nb_elem; i++) {
1299         MatroskaTrack *track = &tracks[i];
1300         enum CodecID codec_id = CODEC_ID_NONE;
1301         EbmlList *encodings_list = &tracks->encodings;
1302         MatroskaTrackEncoding *encodings = encodings_list->elem;
1303         uint8_t *extradata = NULL;
1304         int extradata_size = 0;
1305         int extradata_offset = 0;
1306         AVIOContext b;
1307
1308         /* Apply some sanity checks. */
1309         if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1310             track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1311             track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1312             av_log(matroska->ctx, AV_LOG_INFO,
1313                    "Unknown or unsupported track type %"PRIu64"\n",
1314                    track->type);
1315             continue;
1316         }
1317         if (track->codec_id == NULL)
1318             continue;
1319
1320         if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1321             if (!track->default_duration)
1322                 track->default_duration = 1000000000/track->video.frame_rate;
1323             if (!track->video.display_width)
1324                 track->video.display_width = track->video.pixel_width;
1325             if (!track->video.display_height)
1326                 track->video.display_height = track->video.pixel_height;
1327         } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1328             if (!track->audio.out_samplerate)
1329                 track->audio.out_samplerate = track->audio.samplerate;
1330         }
1331         if (encodings_list->nb_elem > 1) {
1332             av_log(matroska->ctx, AV_LOG_ERROR,
1333                    "Multiple combined encodings no supported");
1334         } else if (encodings_list->nb_elem == 1) {
1335             if (encodings[0].type ||
1336                 (encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
1337 #if CONFIG_ZLIB
1338                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1339 #endif
1340 #if CONFIG_BZLIB
1341                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1342 #endif
1343                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
1344                 encodings[0].scope = 0;
1345                 av_log(matroska->ctx, AV_LOG_ERROR,
1346                        "Unsupported encoding type");
1347             } else if (track->codec_priv.size && encodings[0].scope&2) {
1348                 uint8_t *codec_priv = track->codec_priv.data;
1349                 int offset = matroska_decode_buffer(&track->codec_priv.data,
1350                                                     &track->codec_priv.size,
1351                                                     track);
1352                 if (offset < 0) {
1353                     track->codec_priv.data = NULL;
1354                     track->codec_priv.size = 0;
1355                     av_log(matroska->ctx, AV_LOG_ERROR,
1356                            "Failed to decode codec private data\n");
1357                 } else if (offset > 0) {
1358                     track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
1359                     memcpy(track->codec_priv.data,
1360                            encodings[0].compression.settings.data, offset);
1361                     memcpy(track->codec_priv.data+offset, codec_priv,
1362                            track->codec_priv.size);
1363                     track->codec_priv.size += offset;
1364                 }
1365                 if (codec_priv != track->codec_priv.data)
1366                     av_free(codec_priv);
1367             }
1368         }
1369
1370         for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
1371             if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1372                         strlen(ff_mkv_codec_tags[j].str))){
1373                 codec_id= ff_mkv_codec_tags[j].id;
1374                 break;
1375             }
1376         }
1377
1378         st = track->stream = av_new_stream(s, 0);
1379         if (st == NULL)
1380             return AVERROR(ENOMEM);
1381
1382         if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")
1383             && track->codec_priv.size >= 40
1384             && track->codec_priv.data != NULL) {
1385             track->ms_compat = 1;
1386             track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
1387             codec_id = ff_codec_get_id(ff_codec_bmp_tags, track->video.fourcc);
1388             extradata_offset = 40;
1389         } else if (!strcmp(track->codec_id, "A_MS/ACM")
1390                    && track->codec_priv.size >= 14
1391                    && track->codec_priv.data != NULL) {
1392             int ret;
1393             ffio_init_context(&b, track->codec_priv.data, track->codec_priv.size,
1394                           AVIO_FLAG_READ, NULL, NULL, NULL, NULL);
1395             ret = ff_get_wav_header(&b, st->codec, track->codec_priv.size);
1396             if (ret < 0)
1397                 return ret;
1398             codec_id = st->codec->codec_id;
1399             extradata_offset = FFMIN(track->codec_priv.size, 18);
1400         } else if (!strcmp(track->codec_id, "V_QUICKTIME")
1401                    && (track->codec_priv.size >= 86)
1402                    && (track->codec_priv.data != NULL)) {
1403             track->video.fourcc = AV_RL32(track->codec_priv.data);
1404             codec_id=ff_codec_get_id(codec_movvideo_tags, track->video.fourcc);
1405         } else if (codec_id == CODEC_ID_PCM_S16BE) {
1406             switch (track->audio.bitdepth) {
1407             case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1408             case 24:  codec_id = CODEC_ID_PCM_S24BE;  break;
1409             case 32:  codec_id = CODEC_ID_PCM_S32BE;  break;
1410             }
1411         } else if (codec_id == CODEC_ID_PCM_S16LE) {
1412             switch (track->audio.bitdepth) {
1413             case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1414             case 24:  codec_id = CODEC_ID_PCM_S24LE;  break;
1415             case 32:  codec_id = CODEC_ID_PCM_S32LE;  break;
1416             }
1417         } else if (codec_id==CODEC_ID_PCM_F32LE && track->audio.bitdepth==64) {
1418             codec_id = CODEC_ID_PCM_F64LE;
1419         } else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
1420             int profile = matroska_aac_profile(track->codec_id);
1421             int sri = matroska_aac_sri(track->audio.samplerate);
1422             extradata = av_malloc(5);
1423             if (extradata == NULL)
1424                 return AVERROR(ENOMEM);
1425             extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
1426             extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
1427             if (strstr(track->codec_id, "SBR")) {
1428                 sri = matroska_aac_sri(track->audio.out_samplerate);
1429                 extradata[2] = 0x56;
1430                 extradata[3] = 0xE5;
1431                 extradata[4] = 0x80 | (sri<<3);
1432                 extradata_size = 5;
1433             } else
1434                 extradata_size = 2;
1435         } else if (codec_id == CODEC_ID_TTA) {
1436             extradata_size = 30;
1437             extradata = av_mallocz(extradata_size);
1438             if (extradata == NULL)
1439                 return AVERROR(ENOMEM);
1440             ffio_init_context(&b, extradata, extradata_size, 1,
1441                           NULL, NULL, NULL, NULL);
1442             avio_write(&b, "TTA1", 4);
1443             avio_wl16(&b, 1);
1444             avio_wl16(&b, track->audio.channels);
1445             avio_wl16(&b, track->audio.bitdepth);
1446             avio_wl32(&b, track->audio.out_samplerate);
1447             avio_wl32(&b, matroska->ctx->duration * track->audio.out_samplerate);
1448         } else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
1449                    codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
1450             extradata_offset = 26;
1451         } else if (codec_id == CODEC_ID_RA_144) {
1452             track->audio.out_samplerate = 8000;
1453             track->audio.channels = 1;
1454         } else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
1455                    codec_id == CODEC_ID_ATRAC3 || codec_id == CODEC_ID_SIPR) {
1456             int flavor;
1457             ffio_init_context(&b, track->codec_priv.data,track->codec_priv.size,
1458                           0, NULL, NULL, NULL, NULL);
1459             avio_skip(&b, 22);
1460             flavor                       = avio_rb16(&b);
1461             track->audio.coded_framesize = avio_rb32(&b);
1462             avio_skip(&b, 12);
1463             track->audio.sub_packet_h    = avio_rb16(&b);
1464             track->audio.frame_size      = avio_rb16(&b);
1465             track->audio.sub_packet_size = avio_rb16(&b);
1466             track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
1467             if (codec_id == CODEC_ID_RA_288) {
1468                 st->codec->block_align = track->audio.coded_framesize;
1469                 track->codec_priv.size = 0;
1470             } else {
1471                 if (codec_id == CODEC_ID_SIPR && flavor < 4) {
1472                     const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
1473                     track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
1474                     st->codec->bit_rate = sipr_bit_rate[flavor];
1475                 }
1476                 st->codec->block_align = track->audio.sub_packet_size;
1477                 extradata_offset = 78;
1478             }
1479         }
1480         track->codec_priv.size -= extradata_offset;
1481
1482         if (codec_id == CODEC_ID_NONE)
1483             av_log(matroska->ctx, AV_LOG_INFO,
1484                    "Unknown/unsupported CodecID %s.\n", track->codec_id);
1485
1486         if (track->time_scale < 0.01)
1487             track->time_scale = 1.0;
1488         av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
1489
1490         st->codec->codec_id = codec_id;
1491         st->start_time = 0;
1492         if (strcmp(track->language, "und"))
1493             av_dict_set(&st->metadata, "language", track->language, 0);
1494         av_dict_set(&st->metadata, "title", track->name, 0);
1495
1496         if (track->flag_default)
1497             st->disposition |= AV_DISPOSITION_DEFAULT;
1498         if (track->flag_forced)
1499             st->disposition |= AV_DISPOSITION_FORCED;
1500
1501         if (track->default_duration)
1502             av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
1503                       track->default_duration, 1000000000, 30000);
1504
1505         if (!st->codec->extradata) {
1506             if(extradata){
1507                 st->codec->extradata = extradata;
1508                 st->codec->extradata_size = extradata_size;
1509             } else if(track->codec_priv.data && track->codec_priv.size > 0){
1510                 st->codec->extradata = av_mallocz(track->codec_priv.size +
1511                                                   FF_INPUT_BUFFER_PADDING_SIZE);
1512                 if(st->codec->extradata == NULL)
1513                     return AVERROR(ENOMEM);
1514                 st->codec->extradata_size = track->codec_priv.size;
1515                 memcpy(st->codec->extradata,
1516                        track->codec_priv.data + extradata_offset,
1517                        track->codec_priv.size);
1518             }
1519         }
1520
1521         if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1522             st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1523             st->codec->codec_tag  = track->video.fourcc;
1524             st->codec->width  = track->video.pixel_width;
1525             st->codec->height = track->video.pixel_height;
1526             av_reduce(&st->sample_aspect_ratio.num,
1527                       &st->sample_aspect_ratio.den,
1528                       st->codec->height * track->video.display_width,
1529                       st->codec-> width * track->video.display_height,
1530                       255);
1531             if (st->codec->codec_id != CODEC_ID_H264)
1532             st->need_parsing = AVSTREAM_PARSE_HEADERS;
1533             if (track->default_duration)
1534                 st->avg_frame_rate = av_d2q(1000000000.0/track->default_duration, INT_MAX);
1535         } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1536             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1537             st->codec->sample_rate = track->audio.out_samplerate;
1538             st->codec->channels = track->audio.channels;
1539             if (st->codec->codec_id != CODEC_ID_AAC)
1540             st->need_parsing = AVSTREAM_PARSE_HEADERS;
1541         } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1542             st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1543         }
1544     }
1545
1546     attachements = attachements_list->elem;
1547     for (j=0; j<attachements_list->nb_elem; j++) {
1548         if (!(attachements[j].filename && attachements[j].mime &&
1549               attachements[j].bin.data && attachements[j].bin.size > 0)) {
1550             av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
1551         } else {
1552             AVStream *st = av_new_stream(s, 0);
1553             if (st == NULL)
1554                 break;
1555             av_dict_set(&st->metadata, "filename",attachements[j].filename, 0);
1556             st->codec->codec_id = CODEC_ID_NONE;
1557             st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
1558             st->codec->extradata  = av_malloc(attachements[j].bin.size);
1559             if(st->codec->extradata == NULL)
1560                 break;
1561             st->codec->extradata_size = attachements[j].bin.size;
1562             memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
1563
1564             for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
1565                 if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
1566                              strlen(ff_mkv_mime_tags[i].str))) {
1567                     st->codec->codec_id = ff_mkv_mime_tags[i].id;
1568                     break;
1569                 }
1570             }
1571             attachements[j].stream = st;
1572         }
1573     }
1574
1575     chapters = chapters_list->elem;
1576     for (i=0; i<chapters_list->nb_elem; i++)
1577         if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid
1578             && (max_start==0 || chapters[i].start > max_start)) {
1579             chapters[i].chapter =
1580             ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
1581                            chapters[i].start, chapters[i].end,
1582                            chapters[i].title);
1583             av_dict_set(&chapters[i].chapter->metadata,
1584                              "title", chapters[i].title, 0);
1585             max_start = chapters[i].start;
1586         }
1587
1588     matroska_convert_tags(s);
1589
1590     return 0;
1591 }
1592
1593 /*
1594  * Put one packet in an application-supplied AVPacket struct.
1595  * Returns 0 on success or -1 on failure.
1596  */
1597 static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
1598                                    AVPacket *pkt)
1599 {
1600     if (matroska->num_packets > 0) {
1601         memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
1602         av_free(matroska->packets[0]);
1603         if (matroska->num_packets > 1) {
1604             memmove(&matroska->packets[0], &matroska->packets[1],
1605                     (matroska->num_packets - 1) * sizeof(AVPacket *));
1606             matroska->packets =
1607                 av_realloc(matroska->packets, (matroska->num_packets - 1) *
1608                            sizeof(AVPacket *));
1609         } else {
1610             av_freep(&matroska->packets);
1611         }
1612         matroska->num_packets--;
1613         return 0;
1614     }
1615
1616     return -1;
1617 }
1618
1619 /*
1620  * Free all packets in our internal queue.
1621  */
1622 static void matroska_clear_queue(MatroskaDemuxContext *matroska)
1623 {
1624     if (matroska->packets) {
1625         int n;
1626         for (n = 0; n < matroska->num_packets; n++) {
1627             av_free_packet(matroska->packets[n]);
1628             av_free(matroska->packets[n]);
1629         }
1630         av_freep(&matroska->packets);
1631         matroska->num_packets = 0;
1632     }
1633 }
1634
1635 static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
1636                                 int size, int64_t pos, uint64_t cluster_time,
1637                                 uint64_t duration, int is_keyframe,
1638                                 int64_t cluster_pos)
1639 {
1640     uint64_t timecode = AV_NOPTS_VALUE;
1641     MatroskaTrack *track;
1642     int res = 0;
1643     AVStream *st;
1644     AVPacket *pkt;
1645     int16_t block_time;
1646     uint32_t *lace_size = NULL;
1647     int n, flags, laces = 0;
1648     uint64_t num;
1649
1650     if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
1651         av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
1652         return res;
1653     }
1654     data += n;
1655     size -= n;
1656
1657     track = matroska_find_track_by_num(matroska, num);
1658     if (size <= 3 || !track || !track->stream) {
1659         av_log(matroska->ctx, AV_LOG_INFO,
1660                "Invalid stream %"PRIu64" or size %u\n", num, size);
1661         return AVERROR_INVALIDDATA;
1662     }
1663     st = track->stream;
1664     if (st->discard >= AVDISCARD_ALL)
1665         return res;
1666     if (duration == AV_NOPTS_VALUE)
1667         duration = track->default_duration / matroska->time_scale;
1668
1669     block_time = AV_RB16(data);
1670     data += 2;
1671     flags = *data++;
1672     size -= 3;
1673     if (is_keyframe == -1)
1674         is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
1675
1676     if (cluster_time != (uint64_t)-1
1677         && (block_time >= 0 || cluster_time >= -block_time)) {
1678         timecode = cluster_time + block_time;
1679         if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE
1680             && timecode < track->end_timecode)
1681             is_keyframe = 0;  /* overlapping subtitles are not key frame */
1682         if (is_keyframe)
1683             av_add_index_entry(st, cluster_pos, timecode, 0,0,AVINDEX_KEYFRAME);
1684         track->end_timecode = FFMAX(track->end_timecode, timecode+duration);
1685     }
1686
1687     if (matroska->skip_to_keyframe && track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1688         if (!is_keyframe || timecode < matroska->skip_to_timecode)
1689             return res;
1690         matroska->skip_to_keyframe = 0;
1691     }
1692
1693     switch ((flags & 0x06) >> 1) {
1694         case 0x0: /* no lacing */
1695             laces = 1;
1696             lace_size = av_mallocz(sizeof(int));
1697             lace_size[0] = size;
1698             break;
1699
1700         case 0x1: /* Xiph lacing */
1701         case 0x2: /* fixed-size lacing */
1702         case 0x3: /* EBML lacing */
1703             assert(size>0); // size <=3 is checked before size-=3 above
1704             laces = (*data) + 1;
1705             data += 1;
1706             size -= 1;
1707             lace_size = av_mallocz(laces * sizeof(int));
1708
1709             switch ((flags & 0x06) >> 1) {
1710                 case 0x1: /* Xiph lacing */ {
1711                     uint8_t temp;
1712                     uint32_t total = 0;
1713                     for (n = 0; res == 0 && n < laces - 1; n++) {
1714                         while (1) {
1715                             if (size == 0) {
1716                                 res = -1;
1717                                 break;
1718                             }
1719                             temp = *data;
1720                             lace_size[n] += temp;
1721                             data += 1;
1722                             size -= 1;
1723                             if (temp != 0xff)
1724                                 break;
1725                         }
1726                         total += lace_size[n];
1727                     }
1728                     lace_size[n] = size - total;
1729                     break;
1730                 }
1731
1732                 case 0x2: /* fixed-size lacing */
1733                     for (n = 0; n < laces; n++)
1734                         lace_size[n] = size / laces;
1735                     break;
1736
1737                 case 0x3: /* EBML lacing */ {
1738                     uint32_t total;
1739                     n = matroska_ebmlnum_uint(matroska, data, size, &num);
1740                     if (n < 0) {
1741                         av_log(matroska->ctx, AV_LOG_INFO,
1742                                "EBML block data error\n");
1743                         break;
1744                     }
1745                     data += n;
1746                     size -= n;
1747                     total = lace_size[0] = num;
1748                     for (n = 1; res == 0 && n < laces - 1; n++) {
1749                         int64_t snum;
1750                         int r;
1751                         r = matroska_ebmlnum_sint(matroska, data, size, &snum);
1752                         if (r < 0) {
1753                             av_log(matroska->ctx, AV_LOG_INFO,
1754                                    "EBML block data error\n");
1755                             break;
1756                         }
1757                         data += r;
1758                         size -= r;
1759                         lace_size[n] = lace_size[n - 1] + snum;
1760                         total += lace_size[n];
1761                     }
1762                     lace_size[n] = size - total;
1763                     break;
1764                 }
1765             }
1766             break;
1767     }
1768
1769     if (res == 0) {
1770         for (n = 0; n < laces; n++) {
1771             if ((st->codec->codec_id == CODEC_ID_RA_288 ||
1772                  st->codec->codec_id == CODEC_ID_COOK ||
1773                  st->codec->codec_id == CODEC_ID_SIPR ||
1774                  st->codec->codec_id == CODEC_ID_ATRAC3) &&
1775                  st->codec->block_align && track->audio.sub_packet_size) {
1776                 int a = st->codec->block_align;
1777                 int sps = track->audio.sub_packet_size;
1778                 int cfs = track->audio.coded_framesize;
1779                 int h = track->audio.sub_packet_h;
1780                 int y = track->audio.sub_packet_cnt;
1781                 int w = track->audio.frame_size;
1782                 int x;
1783
1784                 if (!track->audio.pkt_cnt) {
1785                     if (track->audio.sub_packet_cnt == 0)
1786                         track->audio.buf_timecode = timecode;
1787                     if (st->codec->codec_id == CODEC_ID_RA_288)
1788                         for (x=0; x<h/2; x++)
1789                             memcpy(track->audio.buf+x*2*w+y*cfs,
1790                                    data+x*cfs, cfs);
1791                     else if (st->codec->codec_id == CODEC_ID_SIPR)
1792                         memcpy(track->audio.buf + y*w, data, w);
1793                     else
1794                         for (x=0; x<w/sps; x++)
1795                             memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
1796
1797                     if (++track->audio.sub_packet_cnt >= h) {
1798                         if (st->codec->codec_id == CODEC_ID_SIPR)
1799                             ff_rm_reorder_sipr_data(track->audio.buf, h, w);
1800                         track->audio.sub_packet_cnt = 0;
1801                         track->audio.pkt_cnt = h*w / a;
1802                     }
1803                 }
1804                 while (track->audio.pkt_cnt) {
1805                     pkt = av_mallocz(sizeof(AVPacket));
1806                     av_new_packet(pkt, a);
1807                     memcpy(pkt->data, track->audio.buf
1808                            + a * (h*w / a - track->audio.pkt_cnt--), a);
1809                     pkt->pts = track->audio.buf_timecode;
1810                     track->audio.buf_timecode = AV_NOPTS_VALUE;
1811                     pkt->pos = pos;
1812                     pkt->stream_index = st->index;
1813                     dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1814                 }
1815             } else {
1816                 MatroskaTrackEncoding *encodings = track->encodings.elem;
1817                 int offset = 0, pkt_size = lace_size[n];
1818                 uint8_t *pkt_data = data;
1819
1820                 if (pkt_size > size) {
1821                     av_log(matroska->ctx, AV_LOG_ERROR, "Invalid packet size\n");
1822                     break;
1823                 }
1824
1825                 if (encodings && encodings->scope & 1) {
1826                     offset = matroska_decode_buffer(&pkt_data,&pkt_size, track);
1827                     if (offset < 0)
1828                         continue;
1829                 }
1830
1831                 pkt = av_mallocz(sizeof(AVPacket));
1832                 /* XXX: prevent data copy... */
1833                 if (av_new_packet(pkt, pkt_size+offset) < 0) {
1834                     av_free(pkt);
1835                     res = AVERROR(ENOMEM);
1836                     break;
1837                 }
1838                 if (offset)
1839                     memcpy (pkt->data, encodings->compression.settings.data, offset);
1840                 memcpy (pkt->data+offset, pkt_data, pkt_size);
1841
1842                 if (pkt_data != data)
1843                     av_free(pkt_data);
1844
1845                 if (n == 0)
1846                     pkt->flags = is_keyframe;
1847                 pkt->stream_index = st->index;
1848
1849                 if (track->ms_compat)
1850                     pkt->dts = timecode;
1851                 else
1852                     pkt->pts = timecode;
1853                 pkt->pos = pos;
1854                 if (st->codec->codec_id == CODEC_ID_TEXT)
1855                     pkt->convergence_duration = duration;
1856                 else if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE)
1857                     pkt->duration = duration;
1858
1859                 if (st->codec->codec_id == CODEC_ID_SSA)
1860                     matroska_fix_ass_packet(matroska, pkt, duration);
1861
1862                 if (matroska->prev_pkt &&
1863                     timecode != AV_NOPTS_VALUE &&
1864                     matroska->prev_pkt->pts == timecode &&
1865                     matroska->prev_pkt->stream_index == st->index &&
1866                     st->codec->codec_id == CODEC_ID_SSA)
1867                     matroska_merge_packets(matroska->prev_pkt, pkt);
1868                 else {
1869                     dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1870                     matroska->prev_pkt = pkt;
1871                 }
1872             }
1873
1874             if (timecode != AV_NOPTS_VALUE)
1875                 timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
1876             data += lace_size[n];
1877             size -= lace_size[n];
1878         }
1879     }
1880
1881     av_free(lace_size);
1882     return res;
1883 }
1884
1885 static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
1886 {
1887     MatroskaCluster cluster = { 0 };
1888     EbmlList *blocks_list;
1889     MatroskaBlock *blocks;
1890     int i, res;
1891     int64_t pos = avio_tell(matroska->ctx->pb);
1892     matroska->prev_pkt = NULL;
1893     if (matroska->current_id)
1894         pos -= 4;  /* sizeof the ID which was already read */
1895     res = ebml_parse(matroska, matroska_clusters, &cluster);
1896     blocks_list = &cluster.blocks;
1897     blocks = blocks_list->elem;
1898     for (i=0; i<blocks_list->nb_elem && !res; i++)
1899         if (blocks[i].bin.size > 0 && blocks[i].bin.data) {
1900             int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
1901             if (!blocks[i].non_simple)
1902                 blocks[i].duration = AV_NOPTS_VALUE;
1903             res=matroska_parse_block(matroska,
1904                                      blocks[i].bin.data, blocks[i].bin.size,
1905                                      blocks[i].bin.pos,  cluster.timecode,
1906                                      blocks[i].duration, is_keyframe,
1907                                      pos);
1908         }
1909     ebml_free(matroska_cluster, &cluster);
1910     if (res < 0)  matroska->done = 1;
1911     return res;
1912 }
1913
1914 static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
1915 {
1916     MatroskaDemuxContext *matroska = s->priv_data;
1917     int ret = 0;
1918
1919     while (!ret && matroska_deliver_packet(matroska, pkt)) {
1920         if (matroska->done)
1921             return AVERROR_EOF;
1922         ret = matroska_parse_cluster(matroska);
1923     }
1924
1925     return ret;
1926 }
1927
1928 static int matroska_read_seek(AVFormatContext *s, int stream_index,
1929                               int64_t timestamp, int flags)
1930 {
1931     MatroskaDemuxContext *matroska = s->priv_data;
1932     MatroskaTrack *tracks = matroska->tracks.elem;
1933     AVStream *st = s->streams[stream_index];
1934     int i, index, index_sub, index_min;
1935
1936     /* Parse the CUES now since we need the index data to seek. */
1937     if (matroska->cues_parsing_deferred) {
1938         matroska_parse_cues(matroska);
1939         matroska->cues_parsing_deferred = 0;
1940     }
1941
1942     if (!st->nb_index_entries)
1943         return 0;
1944     timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
1945
1946     if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1947         avio_seek(s->pb, st->index_entries[st->nb_index_entries-1].pos, SEEK_SET);
1948         matroska->current_id = 0;
1949         while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1950             matroska_clear_queue(matroska);
1951             if (matroska_parse_cluster(matroska) < 0)
1952                 break;
1953         }
1954     }
1955
1956     matroska_clear_queue(matroska);
1957     if (index < 0)
1958         return 0;
1959
1960     index_min = index;
1961     for (i=0; i < matroska->tracks.nb_elem; i++) {
1962         tracks[i].audio.pkt_cnt = 0;
1963         tracks[i].audio.sub_packet_cnt = 0;
1964         tracks[i].audio.buf_timecode = AV_NOPTS_VALUE;
1965         tracks[i].end_timecode = 0;
1966         if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE
1967             && !tracks[i].stream->discard != AVDISCARD_ALL) {
1968             index_sub = av_index_search_timestamp(tracks[i].stream, st->index_entries[index].timestamp, AVSEEK_FLAG_BACKWARD);
1969             if (index_sub >= 0
1970                 && st->index_entries[index_sub].pos < st->index_entries[index_min].pos
1971                 && st->index_entries[index].timestamp - st->index_entries[index_sub].timestamp < 30000000000/matroska->time_scale)
1972                 index_min = index_sub;
1973         }
1974     }
1975
1976     avio_seek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
1977     matroska->current_id = 0;
1978     matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
1979     matroska->skip_to_timecode = st->index_entries[index].timestamp;
1980     matroska->done = 0;
1981     av_update_cur_dts(s, st, st->index_entries[index].timestamp);
1982     return 0;
1983 }
1984
1985 static int matroska_read_close(AVFormatContext *s)
1986 {
1987     MatroskaDemuxContext *matroska = s->priv_data;
1988     MatroskaTrack *tracks = matroska->tracks.elem;
1989     int n;
1990
1991     matroska_clear_queue(matroska);
1992
1993     for (n=0; n < matroska->tracks.nb_elem; n++)
1994         if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
1995             av_free(tracks[n].audio.buf);
1996     ebml_free(matroska_segment, matroska);
1997
1998     return 0;
1999 }
2000
2001 AVInputFormat ff_matroska_demuxer = {
2002     "matroska,webm",
2003     NULL_IF_CONFIG_SMALL("Matroska/WebM file format"),
2004     sizeof(MatroskaDemuxContext),
2005     matroska_probe,
2006     matroska_read_header,
2007     matroska_read_packet,
2008     matroska_read_close,
2009     matroska_read_seek,
2010 };