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  * @author Ronald Bultje <rbultje@ronald.bitfreak.net>
  26  * @author with a little help from Moritz Bunkus <moritz@bunkus.org>
  27  * @author totally reworked by Aurelien Jacobs <aurel@gnuage.org>
  28  * @see 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.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 *const 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_int2float(avio_rb32(pb));
 628     } else if (size == 8){
 629         *num = av_int2double(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     char *res;
 643
 644     /* EBML strings are usually not 0-terminated, so we allocate one
 645      * byte more, read the string and NULL-terminate it ourselves. */
 646     if (!(res = av_malloc(size + 1)))
 647         return AVERROR(ENOMEM);
 648     if (avio_read(pb, (uint8_t *) res, size) != size) {
 649         av_free(res);
 650         return AVERROR(EIO);
 651     }
 652     (res)[size] = '\0';
 653     av_free(*str);
 654     *str = res;
 655
 656     return 0;
 657 }
 658
 659 /*
 660  * Read the next element as binary data.
 661  * 0 is success, < 0 is failure.
 662  */
 663 static int ebml_read_binary(AVIOContext *pb, int length, EbmlBin *bin)
 664 {
 665     av_free(bin->data);
 666     if (!(bin->data = av_malloc(length)))
 667         return AVERROR(ENOMEM);
 668
 669     bin->size = length;
 670     bin->pos  = avio_tell(pb);
 671     if (avio_read(pb, bin->data, length) != length) {
 672         av_freep(&bin->data);
 673         return AVERROR(EIO);
 674     }
 675
 676     return 0;
 677 }
 678
 679 /*
 680  * Read the next element, but only the header. The contents
 681  * are supposed to be sub-elements which can be read separately.
 682  * 0 is success, < 0 is failure.
 683  */
 684 static int ebml_read_master(MatroskaDemuxContext *matroska, uint64_t length)
 685 {
 686     AVIOContext *pb = matroska->ctx->pb;
 687     MatroskaLevel *level;
 688
 689     if (matroska->num_levels >= EBML_MAX_DEPTH) {
 690         av_log(matroska->ctx, AV_LOG_ERROR,
 691                "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
 692         return AVERROR(ENOSYS);
 693     }
 694
 695     level = &matroska->levels[matroska->num_levels++];
 696     level->start = avio_tell(pb);
 697     level->length = length;
 698
 699     return 0;
 700 }
 701
 702 /*
 703  * Read signed/unsigned "EBML" numbers.
 704  * Return: number of bytes processed, < 0 on error
 705  */
 706 static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
 707                                  uint8_t *data, uint32_t size, uint64_t *num)
 708 {
 709     AVIOContext pb;
 710     ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL);
 711     return ebml_read_num(matroska, &pb, FFMIN(size, 8), num);
 712 }
 713
 714 /*
 715  * Same as above, but signed.
 716  */
 717 static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
 718                                  uint8_t *data, uint32_t size, int64_t *num)
 719 {
 720     uint64_t unum;
 721     int res;
 722
 723     /* read as unsigned number first */
 724     if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
 725         return res;
 726
 727     /* make signed (weird way) */
 728     *num = unum - ((1LL << (7*res - 1)) - 1);
 729
 730     return res;
 731 }
 732
 733 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
 734                            EbmlSyntax *syntax, void *data);
 735
 736 static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
 737                          uint32_t id, void *data)
 738 {
 739     int i;
 740     for (i=0; syntax[i].id; i++)
 741         if (id == syntax[i].id)
 742             break;
 743     if (!syntax[i].id && id == MATROSKA_ID_CLUSTER &&
 744         matroska->num_levels > 0 &&
 745         matroska->levels[matroska->num_levels-1].length == 0xffffffffffffff)
 746         return 0;  // we reached the end of an unknown size cluster
 747     if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32)
 748         av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
 749     return ebml_parse_elem(matroska, &syntax[i], data);
 750 }
 751
 752 static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
 753                       void *data)
 754 {
 755     if (!matroska->current_id) {
 756         uint64_t id;
 757         int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
 758         if (res < 0)
 759             return res;
 760         matroska->current_id = id | 1 << 7*res;
 761     }
 762     return ebml_parse_id(matroska, syntax, matroska->current_id, data);
 763 }
 764
 765 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
 766                            void *data)
 767 {
 768     int i, res = 0;
 769
 770     for (i=0; syntax[i].id; i++)
 771         switch (syntax[i].type) {
 772         case EBML_UINT:
 773             *(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
 774             break;
 775         case EBML_FLOAT:
 776             *(double   *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
 777             break;
 778         case EBML_STR:
 779         case EBML_UTF8:
 780             *(char    **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
 781             break;
 782         }
 783
 784     while (!res && !ebml_level_end(matroska))
 785         res = ebml_parse(matroska, syntax, data);
 786
 787     return res;
 788 }
 789
 790 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
 791                            EbmlSyntax *syntax, void *data)
 792 {
 793     static const uint64_t max_lengths[EBML_TYPE_COUNT] = {
 794         [EBML_UINT]  = 8,
 795         [EBML_FLOAT] = 8,
 796         // max. 16 MB for strings
 797         [EBML_STR]   = 0x1000000,
 798         [EBML_UTF8]  = 0x1000000,
 799         // max. 256 MB for binary data
 800         [EBML_BIN]   = 0x10000000,
 801         // no limits for anything else
 802     };
 803     AVIOContext *pb = matroska->ctx->pb;
 804     uint32_t id = syntax->id;
 805     uint64_t length;
 806     int res;
 807     void *newelem;
 808
 809     data = (char *)data + syntax->data_offset;
 810     if (syntax->list_elem_size) {
 811         EbmlList *list = data;
 812         newelem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
 813         if (!newelem)
 814             return AVERROR(ENOMEM);
 815         list->elem = newelem;
 816         data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
 817         memset(data, 0, syntax->list_elem_size);
 818         list->nb_elem++;
 819     }
 820
 821     if (syntax->type != EBML_PASS && syntax->type != EBML_STOP) {
 822         matroska->current_id = 0;
 823         if ((res = ebml_read_length(matroska, pb, &length)) < 0)
 824             return res;
 825         if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) {
 826             av_log(matroska->ctx, AV_LOG_ERROR,
 827                    "Invalid length 0x%"PRIx64" > 0x%"PRIx64" for syntax element %i\n",
 828                    length, max_lengths[syntax->type], syntax->type);
 829             return AVERROR_INVALIDDATA;
 830         }
 831     }
 832
 833     switch (syntax->type) {
 834     case EBML_UINT:  res = ebml_read_uint  (pb, length, data);  break;
 835     case EBML_FLOAT: res = ebml_read_float (pb, length, data);  break;
 836     case EBML_STR:
 837     case EBML_UTF8:  res = ebml_read_ascii (pb, length, data);  break;
 838     case EBML_BIN:   res = ebml_read_binary(pb, length, data);  break;
 839     case EBML_NEST:  if ((res=ebml_read_master(matroska, length)) < 0)
 840                          return res;
 841                      if (id == MATROSKA_ID_SEGMENT)
 842                          matroska->segment_start = avio_tell(matroska->ctx->pb);
 843                      return ebml_parse_nest(matroska, syntax->def.n, data);
 844     case EBML_PASS:  return ebml_parse_id(matroska, syntax->def.n, id, data);
 845     case EBML_STOP:  return 1;
 846     default:         return avio_skip(pb,length)<0 ? AVERROR(EIO) : 0;
 847     }
 848     if (res == AVERROR_INVALIDDATA)
 849         av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
 850     else if (res == AVERROR(EIO))
 851         av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
 852     return res;
 853 }
 854
 855 static void ebml_free(EbmlSyntax *syntax, void *data)
 856 {
 857     int i, j;
 858     for (i=0; syntax[i].id; i++) {
 859         void *data_off = (char *)data + syntax[i].data_offset;
 860         switch (syntax[i].type) {
 861         case EBML_STR:
 862         case EBML_UTF8:  av_freep(data_off);                      break;
 863         case EBML_BIN:   av_freep(&((EbmlBin *)data_off)->data);  break;
 864         case EBML_NEST:
 865             if (syntax[i].list_elem_size) {
 866                 EbmlList *list = data_off;
 867                 char *ptr = list->elem;
 868                 for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
 869                     ebml_free(syntax[i].def.n, ptr);
 870                 av_free(list->elem);
 871             } else
 872                 ebml_free(syntax[i].def.n, data_off);
 873         default:  break;
 874         }
 875     }
 876 }
 877
 878
 879 /*
 880  * Autodetecting...
 881  */
 882 static int matroska_probe(AVProbeData *p)
 883 {
 884     uint64_t total = 0;
 885     int len_mask = 0x80, size = 1, n = 1, i;
 886
 887     /* EBML header? */
 888     if (AV_RB32(p->buf) != EBML_ID_HEADER)
 889         return 0;
 890
 891     /* length of header */
 892     total = p->buf[4];
 893     while (size <= 8 && !(total & len_mask)) {
 894         size++;
 895         len_mask >>= 1;
 896     }
 897     if (size > 8)
 898       return 0;
 899     total &= (len_mask - 1);
 900     while (n < size)
 901         total = (total << 8) | p->buf[4 + n++];
 902
 903     /* Does the probe data contain the whole header? */
 904     if (p->buf_size < 4 + size + total)
 905       return 0;
 906
 907     /* The header should contain a known document type. For now,
 908      * we don't parse the whole header but simply check for the
 909      * availability of that array of characters inside the header.
 910      * Not fully fool-proof, but good enough. */
 911     for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
 912         int probelen = strlen(matroska_doctypes[i]);
 913         if (total < probelen)
 914             continue;
 915         for (n = 4+size; n <= 4+size+total-probelen; n++)
 916             if (!memcmp(p->buf+n, matroska_doctypes[i], probelen))
 917                 return AVPROBE_SCORE_MAX;
 918     }
 919
 920     // probably valid EBML header but no recognized doctype
 921     return AVPROBE_SCORE_MAX/2;
 922 }
 923
 924 static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
 925                                                  int num)
 926 {
 927     MatroskaTrack *tracks = matroska->tracks.elem;
 928     int i;
 929
 930     for (i=0; i < matroska->tracks.nb_elem; i++)
 931         if (tracks[i].num == num)
 932             return &tracks[i];
 933
 934     av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
 935     return NULL;
 936 }
 937
 938 static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
 939                                   MatroskaTrack *track)
 940 {
 941     MatroskaTrackEncoding *encodings = track->encodings.elem;
 942     uint8_t* data = *buf;
 943     int isize = *buf_size;
 944     uint8_t* pkt_data = NULL;
 945     uint8_t av_unused *newpktdata;
 946     int pkt_size = isize;
 947     int result = 0;
 948     int olen;
 949
 950     if (pkt_size >= 10000000)
 951         return -1;
 952
 953     switch (encodings[0].compression.algo) {
 954     case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
 955         return encodings[0].compression.settings.size;
 956     case MATROSKA_TRACK_ENCODING_COMP_LZO:
 957         do {
 958             olen = pkt_size *= 3;
 959             pkt_data = av_realloc(pkt_data, pkt_size+AV_LZO_OUTPUT_PADDING);
 960             result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
 961         } while (result==AV_LZO_OUTPUT_FULL && pkt_size<10000000);
 962         if (result)
 963             goto failed;
 964         pkt_size -= olen;
 965         break;
 966 #if CONFIG_ZLIB
 967     case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
 968         z_stream zstream = {0};
 969         if (inflateInit(&zstream) != Z_OK)
 970             return -1;
 971         zstream.next_in = data;
 972         zstream.avail_in = isize;
 973         do {
 974             pkt_size *= 3;
 975             newpktdata = av_realloc(pkt_data, pkt_size);
 976             if (!newpktdata) {
 977                 inflateEnd(&zstream);
 978                 goto failed;
 979             }
 980             pkt_data = newpktdata;
 981             zstream.avail_out = pkt_size - zstream.total_out;
 982             zstream.next_out = pkt_data + zstream.total_out;
 983             result = inflate(&zstream, Z_NO_FLUSH);
 984         } while (result==Z_OK && pkt_size<10000000);
 985         pkt_size = zstream.total_out;
 986         inflateEnd(&zstream);
 987         if (result != Z_STREAM_END)
 988             goto failed;
 989         break;
 990     }
 991 #endif
 992 #if CONFIG_BZLIB
 993     case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
 994         bz_stream bzstream = {0};
 995         if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
 996             return -1;
 997         bzstream.next_in = data;
 998         bzstream.avail_in = isize;
 999         do {
1000             pkt_size *= 3;
1001             newpktdata = av_realloc(pkt_data, pkt_size);
1002             if (!newpktdata) {
1003                 BZ2_bzDecompressEnd(&bzstream);
1004                 goto failed;
1005             }
1006             pkt_data = newpktdata;
1007             bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
1008             bzstream.next_out = pkt_data + bzstream.total_out_lo32;
1009             result = BZ2_bzDecompress(&bzstream);
1010         } while (result==BZ_OK && pkt_size<10000000);
1011         pkt_size = bzstream.total_out_lo32;
1012         BZ2_bzDecompressEnd(&bzstream);
1013         if (result != BZ_STREAM_END)
1014             goto failed;
1015         break;
1016     }
1017 #endif
1018     default:
1019         return -1;
1020     }
1021
1022     *buf = pkt_data;
1023     *buf_size = pkt_size;
1024     return 0;
1025  failed:
1026     av_free(pkt_data);
1027     return -1;
1028 }
1029
1030 static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
1031                                     AVPacket *pkt, uint64_t display_duration)
1032 {
1033     char *line, *layer, *ptr = pkt->data, *end = ptr+pkt->size;
1034     for (; *ptr!=',' && ptr<end-1; ptr++);
1035     if (*ptr == ',')
1036         layer = ++ptr;
1037     for (; *ptr!=',' && ptr<end-1; ptr++);
1038     if (*ptr == ',') {
1039         int64_t end_pts = pkt->pts + display_duration;
1040         int sc = matroska->time_scale * pkt->pts / 10000000;
1041         int ec = matroska->time_scale * end_pts  / 10000000;
1042         int sh, sm, ss, eh, em, es, len;
1043         sh = sc/360000;  sc -= 360000*sh;
1044         sm = sc/  6000;  sc -=   6000*sm;
1045         ss = sc/   100;  sc -=    100*ss;
1046         eh = ec/360000;  ec -= 360000*eh;
1047         em = ec/  6000;  ec -=   6000*em;
1048         es = ec/   100;  ec -=    100*es;
1049         *ptr++ = '\0';
1050         len = 50 + end-ptr + FF_INPUT_BUFFER_PADDING_SIZE;
1051         if (!(line = av_malloc(len)))
1052             return;
1053         snprintf(line,len,"Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
1054                  layer, sh, sm, ss, sc, eh, em, es, ec, ptr);
1055         av_free(pkt->data);
1056         pkt->data = line;
1057         pkt->size = strlen(line);
1058     }
1059 }
1060
1061 static int matroska_merge_packets(AVPacket *out, AVPacket *in)
1062 {
1063     void *newdata = av_realloc(out->data, out->size+in->size);
1064     if (!newdata)
1065         return AVERROR(ENOMEM);
1066     out->data = newdata;
1067     memcpy(out->data+out->size, in->data, in->size);
1068     out->size += in->size;
1069     av_destruct_packet(in);
1070     av_free(in);
1071     return 0;
1072 }
1073
1074 static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
1075                                  AVDictionary **metadata, char *prefix)
1076 {
1077     MatroskaTag *tags = list->elem;
1078     char key[1024];
1079     int i;
1080
1081     for (i=0; i < list->nb_elem; i++) {
1082         const char *lang = strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1083
1084         if (!tags[i].name) {
1085             av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");
1086             continue;
1087         }
1088         if (prefix)  snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1089         else         av_strlcpy(key, tags[i].name, sizeof(key));
1090         if (tags[i].def || !lang) {
1091         av_dict_set(metadata, key, tags[i].string, 0);
1092         if (tags[i].sub.nb_elem)
1093             matroska_convert_tag(s, &tags[i].sub, metadata, key);
1094         }
1095         if (lang) {
1096             av_strlcat(key, "-", sizeof(key));
1097             av_strlcat(key, lang, sizeof(key));
1098             av_dict_set(metadata, key, tags[i].string, 0);
1099             if (tags[i].sub.nb_elem)
1100                 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1101         }
1102     }
1103     ff_metadata_conv(metadata, NULL, ff_mkv_metadata_conv);
1104 }
1105
1106 static void matroska_convert_tags(AVFormatContext *s)
1107 {
1108     MatroskaDemuxContext *matroska = s->priv_data;
1109     MatroskaTags *tags = matroska->tags.elem;
1110     int i, j;
1111
1112     for (i=0; i < matroska->tags.nb_elem; i++) {
1113         if (tags[i].target.attachuid) {
1114             MatroskaAttachement *attachment = matroska->attachments.elem;
1115             for (j=0; j<matroska->attachments.nb_elem; j++)
1116                 if (attachment[j].uid == tags[i].target.attachuid
1117                     && attachment[j].stream)
1118                     matroska_convert_tag(s, &tags[i].tag,
1119                                          &attachment[j].stream->metadata, NULL);
1120         } else if (tags[i].target.chapteruid) {
1121             MatroskaChapter *chapter = matroska->chapters.elem;
1122             for (j=0; j<matroska->chapters.nb_elem; j++)
1123                 if (chapter[j].uid == tags[i].target.chapteruid
1124                     && chapter[j].chapter)
1125                     matroska_convert_tag(s, &tags[i].tag,
1126                                          &chapter[j].chapter->metadata, NULL);
1127         } else if (tags[i].target.trackuid) {
1128             MatroskaTrack *track = matroska->tracks.elem;
1129             for (j=0; j<matroska->tracks.nb_elem; j++)
1130                 if (track[j].uid == tags[i].target.trackuid && track[j].stream)
1131                     matroska_convert_tag(s, &tags[i].tag,
1132                                          &track[j].stream->metadata, NULL);
1133         } else {
1134             matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1135                                  tags[i].target.type);
1136         }
1137     }
1138 }
1139
1140 static int matroska_parse_seekhead_entry(MatroskaDemuxContext *matroska, int idx)
1141 {
1142     EbmlList *seekhead_list = &matroska->seekhead;
1143     MatroskaSeekhead *seekhead = seekhead_list->elem;
1144     uint32_t level_up = matroska->level_up;
1145     int64_t before_pos = avio_tell(matroska->ctx->pb);
1146     uint32_t saved_id = matroska->current_id;
1147     MatroskaLevel level;
1148     int64_t offset;
1149     int ret = 0;
1150
1151     if (idx >= seekhead_list->nb_elem
1152             || seekhead[idx].id == MATROSKA_ID_SEEKHEAD
1153             || seekhead[idx].id == MATROSKA_ID_CLUSTER)
1154         return 0;
1155
1156     /* seek */
1157     offset = seekhead[idx].pos + matroska->segment_start;
1158     if (avio_seek(matroska->ctx->pb, offset, SEEK_SET) == offset) {
1159         /* We don't want to lose our seekhead level, so we add
1160          * a dummy. This is a crude hack. */
1161         if (matroska->num_levels == EBML_MAX_DEPTH) {
1162             av_log(matroska->ctx, AV_LOG_INFO,
1163                    "Max EBML element depth (%d) reached, "
1164                    "cannot parse further.\n", EBML_MAX_DEPTH);
1165             ret = AVERROR_INVALIDDATA;
1166         } else {
1167             level.start = 0;
1168             level.length = (uint64_t)-1;
1169             matroska->levels[matroska->num_levels] = level;
1170             matroska->num_levels++;
1171             matroska->current_id = 0;
1172
1173             ret = ebml_parse(matroska, matroska_segment, matroska);
1174
1175             /* remove dummy level */
1176             while (matroska->num_levels) {
1177                 uint64_t length = matroska->levels[--matroska->num_levels].length;
1178                 if (length == (uint64_t)-1)
1179                     break;
1180             }
1181         }
1182     }
1183     /* seek back */
1184     avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
1185     matroska->level_up = level_up;
1186     matroska->current_id = saved_id;
1187
1188     return ret;
1189 }
1190
1191 static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1192 {
1193     EbmlList *seekhead_list = &matroska->seekhead;
1194     int64_t before_pos = avio_tell(matroska->ctx->pb);
1195     int i;
1196
1197     // we should not do any seeking in the streaming case
1198     if (!matroska->ctx->pb->seekable ||
1199         (matroska->ctx->flags & AVFMT_FLAG_IGNIDX))
1200         return;
1201
1202     for (i = 0; i < seekhead_list->nb_elem; i++) {
1203         MatroskaSeekhead *seekhead = seekhead_list->elem;
1204         if (seekhead[i].pos <= before_pos)
1205             continue;
1206
1207         // defer cues parsing until we actually need cue data.
1208         if (seekhead[i].id == MATROSKA_ID_CUES) {
1209             matroska->cues_parsing_deferred = 1;
1210             continue;
1211         }
1212
1213         if (matroska_parse_seekhead_entry(matroska, i) < 0)
1214             break;
1215     }
1216 }
1217
1218 static void matroska_parse_cues(MatroskaDemuxContext *matroska) {
1219     EbmlList *seekhead_list = &matroska->seekhead;
1220     MatroskaSeekhead *seekhead = seekhead_list->elem;
1221     EbmlList *index_list;
1222     MatroskaIndex *index;
1223     int index_scale = 1;
1224     int i, j;
1225
1226     for (i = 0; i < seekhead_list->nb_elem; i++)
1227         if (seekhead[i].id == MATROSKA_ID_CUES)
1228             break;
1229     assert(i <= seekhead_list->nb_elem);
1230
1231     matroska_parse_seekhead_entry(matroska, i);
1232
1233     index_list = &matroska->index;
1234     index = index_list->elem;
1235     if (index_list->nb_elem
1236         && index[0].time > 1E14/matroska->time_scale) {
1237         av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
1238         index_scale = matroska->time_scale;
1239     }
1240     for (i = 0; i < index_list->nb_elem; i++) {
1241         EbmlList *pos_list = &index[i].pos;
1242         MatroskaIndexPos *pos = pos_list->elem;
1243         for (j = 0; j < pos_list->nb_elem; j++) {
1244             MatroskaTrack *track = matroska_find_track_by_num(matroska, pos[j].track);
1245             if (track && track->stream)
1246                 av_add_index_entry(track->stream,
1247                                    pos[j].pos + matroska->segment_start,
1248                                    index[i].time/index_scale, 0, 0,
1249                                    AVINDEX_KEYFRAME);
1250         }
1251     }
1252 }
1253
1254 static int matroska_aac_profile(char *codec_id)
1255 {
1256     static const char * const aac_profiles[] = { "MAIN", "LC", "SSR" };
1257     int profile;
1258
1259     for (profile=0; profile<FF_ARRAY_ELEMS(aac_profiles); profile++)
1260         if (strstr(codec_id, aac_profiles[profile]))
1261             break;
1262     return profile + 1;
1263 }
1264
1265 static int matroska_aac_sri(int samplerate)
1266 {
1267     int sri;
1268
1269     for (sri=0; sri<FF_ARRAY_ELEMS(avpriv_mpeg4audio_sample_rates); sri++)
1270         if (avpriv_mpeg4audio_sample_rates[sri] == samplerate)
1271             break;
1272     return sri;
1273 }
1274
1275 static int matroska_read_header(AVFormatContext *s)
1276 {
1277     MatroskaDemuxContext *matroska = s->priv_data;
1278     EbmlList *attachements_list = &matroska->attachments;
1279     MatroskaAttachement *attachements;
1280     EbmlList *chapters_list = &matroska->chapters;
1281     MatroskaChapter *chapters;
1282     MatroskaTrack *tracks;
1283     uint64_t max_start = 0;
1284     Ebml ebml = { 0 };
1285     AVStream *st;
1286     int i, j, res;
1287
1288     matroska->ctx = s;
1289
1290     /* First read the EBML header. */
1291     if (ebml_parse(matroska, ebml_syntax, &ebml)
1292         || ebml.version > EBML_VERSION       || ebml.max_size > sizeof(uint64_t)
1293         || ebml.id_length > sizeof(uint32_t) || ebml.doctype_version > 2) {
1294         av_log(matroska->ctx, AV_LOG_ERROR,
1295                "EBML header using unsupported features\n"
1296                "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
1297                ebml.version, ebml.doctype, ebml.doctype_version);
1298         ebml_free(ebml_syntax, &ebml);
1299         return AVERROR_PATCHWELCOME;
1300     }
1301     for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
1302         if (!strcmp(ebml.doctype, matroska_doctypes[i]))
1303             break;
1304     if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
1305         av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
1306     }
1307     ebml_free(ebml_syntax, &ebml);
1308
1309     /* The next thing is a segment. */
1310     if ((res = ebml_parse(matroska, matroska_segments, matroska)) < 0)
1311         return res;
1312     matroska_execute_seekhead(matroska);
1313
1314     if (!matroska->time_scale)
1315         matroska->time_scale = 1000000;
1316     if (matroska->duration)
1317         matroska->ctx->duration = matroska->duration * matroska->time_scale
1318                                   * 1000 / AV_TIME_BASE;
1319     av_dict_set(&s->metadata, "title", matroska->title, 0);
1320
1321     tracks = matroska->tracks.elem;
1322     for (i=0; i < matroska->tracks.nb_elem; i++) {
1323         MatroskaTrack *track = &tracks[i];
1324         enum CodecID codec_id = CODEC_ID_NONE;
1325         EbmlList *encodings_list = &tracks->encodings;
1326         MatroskaTrackEncoding *encodings = encodings_list->elem;
1327         uint8_t *extradata = NULL;
1328         int extradata_size = 0;
1329         int extradata_offset = 0;
1330         AVIOContext b;
1331
1332         /* Apply some sanity checks. */
1333         if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1334             track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1335             track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1336             av_log(matroska->ctx, AV_LOG_INFO,
1337                    "Unknown or unsupported track type %"PRIu64"\n",
1338                    track->type);
1339             continue;
1340         }
1341         if (track->codec_id == NULL)
1342             continue;
1343
1344         if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1345             if (!track->default_duration)
1346                 track->default_duration = 1000000000/track->video.frame_rate;
1347             if (!track->video.display_width)
1348                 track->video.display_width = track->video.pixel_width;
1349             if (!track->video.display_height)
1350                 track->video.display_height = track->video.pixel_height;
1351         } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1352             if (!track->audio.out_samplerate)
1353                 track->audio.out_samplerate = track->audio.samplerate;
1354         }
1355         if (encodings_list->nb_elem > 1) {
1356             av_log(matroska->ctx, AV_LOG_ERROR,
1357                    "Multiple combined encodings not supported");
1358         } else if (encodings_list->nb_elem == 1) {
1359             if (encodings[0].type ||
1360                 (encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
1361 #if CONFIG_ZLIB
1362                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1363 #endif
1364 #if CONFIG_BZLIB
1365                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1366 #endif
1367                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
1368                 encodings[0].scope = 0;
1369                 av_log(matroska->ctx, AV_LOG_ERROR,
1370                        "Unsupported encoding type");
1371             } else if (track->codec_priv.size && encodings[0].scope&2) {
1372                 uint8_t *codec_priv = track->codec_priv.data;
1373                 int offset = matroska_decode_buffer(&track->codec_priv.data,
1374                                                     &track->codec_priv.size,
1375                                                     track);
1376                 if (offset < 0) {
1377                     track->codec_priv.data = NULL;
1378                     track->codec_priv.size = 0;
1379                     av_log(matroska->ctx, AV_LOG_ERROR,
1380                            "Failed to decode codec private data\n");
1381                 } else if (offset > 0) {
1382                     track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
1383                     memcpy(track->codec_priv.data,
1384                            encodings[0].compression.settings.data, offset);
1385                     memcpy(track->codec_priv.data+offset, codec_priv,
1386                            track->codec_priv.size);
1387                     track->codec_priv.size += offset;
1388                 }
1389                 if (codec_priv != track->codec_priv.data)
1390                     av_free(codec_priv);
1391             }
1392         }
1393
1394         for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
1395             if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1396                         strlen(ff_mkv_codec_tags[j].str))){
1397                 codec_id= ff_mkv_codec_tags[j].id;
1398                 break;
1399             }
1400         }
1401
1402         st = track->stream = avformat_new_stream(s, NULL);
1403         if (st == NULL)
1404             return AVERROR(ENOMEM);
1405
1406         if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")
1407             && track->codec_priv.size >= 40
1408             && track->codec_priv.data != NULL) {
1409             track->ms_compat = 1;
1410             track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
1411             codec_id = ff_codec_get_id(ff_codec_bmp_tags, track->video.fourcc);
1412             extradata_offset = 40;
1413         } else if (!strcmp(track->codec_id, "A_MS/ACM")
1414                    && track->codec_priv.size >= 14
1415                    && track->codec_priv.data != NULL) {
1416             int ret;
1417             ffio_init_context(&b, track->codec_priv.data, track->codec_priv.size,
1418                           AVIO_FLAG_READ, NULL, NULL, NULL, NULL);
1419             ret = ff_get_wav_header(&b, st->codec, track->codec_priv.size);
1420             if (ret < 0)
1421                 return ret;
1422             codec_id = st->codec->codec_id;
1423             extradata_offset = FFMIN(track->codec_priv.size, 18);
1424         } else if (!strcmp(track->codec_id, "V_QUICKTIME")
1425                    && (track->codec_priv.size >= 86)
1426                    && (track->codec_priv.data != NULL)) {
1427             track->video.fourcc = AV_RL32(track->codec_priv.data);
1428             codec_id=ff_codec_get_id(ff_codec_movvideo_tags, track->video.fourcc);
1429         } else if (codec_id == CODEC_ID_PCM_S16BE) {
1430             switch (track->audio.bitdepth) {
1431             case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1432             case 24:  codec_id = CODEC_ID_PCM_S24BE;  break;
1433             case 32:  codec_id = CODEC_ID_PCM_S32BE;  break;
1434             }
1435         } else if (codec_id == CODEC_ID_PCM_S16LE) {
1436             switch (track->audio.bitdepth) {
1437             case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1438             case 24:  codec_id = CODEC_ID_PCM_S24LE;  break;
1439             case 32:  codec_id = CODEC_ID_PCM_S32LE;  break;
1440             }
1441         } else if (codec_id==CODEC_ID_PCM_F32LE && track->audio.bitdepth==64) {
1442             codec_id = CODEC_ID_PCM_F64LE;
1443         } else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
1444             int profile = matroska_aac_profile(track->codec_id);
1445             int sri = matroska_aac_sri(track->audio.samplerate);
1446             extradata = av_mallocz(5 + FF_INPUT_BUFFER_PADDING_SIZE);
1447             if (extradata == NULL)
1448                 return AVERROR(ENOMEM);
1449             extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
1450             extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
1451             if (strstr(track->codec_id, "SBR")) {
1452                 sri = matroska_aac_sri(track->audio.out_samplerate);
1453                 extradata[2] = 0x56;
1454                 extradata[3] = 0xE5;
1455                 extradata[4] = 0x80 | (sri<<3);
1456                 extradata_size = 5;
1457             } else
1458                 extradata_size = 2;
1459         } else if (codec_id == CODEC_ID_TTA) {
1460             extradata_size = 30;
1461             extradata = av_mallocz(extradata_size);
1462             if (extradata == NULL)
1463                 return AVERROR(ENOMEM);
1464             ffio_init_context(&b, extradata, extradata_size, 1,
1465                           NULL, NULL, NULL, NULL);
1466             avio_write(&b, "TTA1", 4);
1467             avio_wl16(&b, 1);
1468             avio_wl16(&b, track->audio.channels);
1469             avio_wl16(&b, track->audio.bitdepth);
1470             avio_wl32(&b, track->audio.out_samplerate);
1471             avio_wl32(&b, matroska->ctx->duration * track->audio.out_samplerate);
1472         } else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
1473                    codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
1474             extradata_offset = 26;
1475         } else if (codec_id == CODEC_ID_RA_144) {
1476             track->audio.out_samplerate = 8000;
1477             track->audio.channels = 1;
1478         } else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
1479                    codec_id == CODEC_ID_ATRAC3 || codec_id == CODEC_ID_SIPR) {
1480             int flavor;
1481             ffio_init_context(&b, track->codec_priv.data,track->codec_priv.size,
1482                           0, NULL, NULL, NULL, NULL);
1483             avio_skip(&b, 22);
1484             flavor                       = avio_rb16(&b);
1485             track->audio.coded_framesize = avio_rb32(&b);
1486             avio_skip(&b, 12);
1487             track->audio.sub_packet_h    = avio_rb16(&b);
1488             track->audio.frame_size      = avio_rb16(&b);
1489             track->audio.sub_packet_size = avio_rb16(&b);
1490             track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
1491             if (codec_id == CODEC_ID_RA_288) {
1492                 st->codec->block_align = track->audio.coded_framesize;
1493                 track->codec_priv.size = 0;
1494             } else {
1495                 if (codec_id == CODEC_ID_SIPR && flavor < 4) {
1496                     const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
1497                     track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
1498                     st->codec->bit_rate = sipr_bit_rate[flavor];
1499                 }
1500                 st->codec->block_align = track->audio.sub_packet_size;
1501                 extradata_offset = 78;
1502             }
1503         }
1504         track->codec_priv.size -= extradata_offset;
1505
1506         if (codec_id == CODEC_ID_NONE)
1507             av_log(matroska->ctx, AV_LOG_INFO,
1508                    "Unknown/unsupported CodecID %s.\n", track->codec_id);
1509
1510         if (track->time_scale < 0.01)
1511             track->time_scale = 1.0;
1512         avpriv_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
1513
1514         st->codec->codec_id = codec_id;
1515         st->start_time = 0;
1516         if (strcmp(track->language, "und"))
1517             av_dict_set(&st->metadata, "language", track->language, 0);
1518         av_dict_set(&st->metadata, "title", track->name, 0);
1519
1520         if (track->flag_default)
1521             st->disposition |= AV_DISPOSITION_DEFAULT;
1522         if (track->flag_forced)
1523             st->disposition |= AV_DISPOSITION_FORCED;
1524
1525         if (!st->codec->extradata) {
1526             if(extradata){
1527                 st->codec->extradata = extradata;
1528                 st->codec->extradata_size = extradata_size;
1529             } else if(track->codec_priv.data && track->codec_priv.size > 0){
1530                 st->codec->extradata = av_mallocz(track->codec_priv.size +
1531                                                   FF_INPUT_BUFFER_PADDING_SIZE);
1532                 if(st->codec->extradata == NULL)
1533                     return AVERROR(ENOMEM);
1534                 st->codec->extradata_size = track->codec_priv.size;
1535                 memcpy(st->codec->extradata,
1536                        track->codec_priv.data + extradata_offset,
1537                        track->codec_priv.size);
1538             }
1539         }
1540
1541         if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1542             st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1543             st->codec->codec_tag  = track->video.fourcc;
1544             st->codec->width  = track->video.pixel_width;
1545             st->codec->height = track->video.pixel_height;
1546             av_reduce(&st->sample_aspect_ratio.num,
1547                       &st->sample_aspect_ratio.den,
1548                       st->codec->height * track->video.display_width,
1549                       st->codec-> width * track->video.display_height,
1550                       255);
1551             if (st->codec->codec_id != CODEC_ID_H264)
1552             st->need_parsing = AVSTREAM_PARSE_HEADERS;
1553             if (track->default_duration)
1554                 st->avg_frame_rate = av_d2q(1000000000.0/track->default_duration, INT_MAX);
1555         } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1556             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1557             st->codec->sample_rate = track->audio.out_samplerate;
1558             st->codec->channels = track->audio.channels;
1559             if (st->codec->codec_id != CODEC_ID_AAC)
1560             st->need_parsing = AVSTREAM_PARSE_HEADERS;
1561         } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1562             st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1563         }
1564     }
1565
1566     attachements = attachements_list->elem;
1567     for (j=0; j<attachements_list->nb_elem; j++) {
1568         if (!(attachements[j].filename && attachements[j].mime &&
1569               attachements[j].bin.data && attachements[j].bin.size > 0)) {
1570             av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
1571         } else {
1572             AVStream *st = avformat_new_stream(s, NULL);
1573             if (st == NULL)
1574                 break;
1575             av_dict_set(&st->metadata, "filename",attachements[j].filename, 0);
1576             av_dict_set(&st->metadata, "mimetype", attachements[j].mime, 0);
1577             st->codec->codec_id = CODEC_ID_NONE;
1578             st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
1579             st->codec->extradata  = av_malloc(attachements[j].bin.size);
1580             if(st->codec->extradata == NULL)
1581                 break;
1582             st->codec->extradata_size = attachements[j].bin.size;
1583             memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
1584
1585             for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
1586                 if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
1587                              strlen(ff_mkv_mime_tags[i].str))) {
1588                     st->codec->codec_id = ff_mkv_mime_tags[i].id;
1589                     break;
1590                 }
1591             }
1592             attachements[j].stream = st;
1593         }
1594     }
1595
1596     chapters = chapters_list->elem;
1597     for (i=0; i<chapters_list->nb_elem; i++)
1598         if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid
1599             && (max_start==0 || chapters[i].start > max_start)) {
1600             chapters[i].chapter =
1601             avpriv_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
1602                            chapters[i].start, chapters[i].end,
1603                            chapters[i].title);
1604             av_dict_set(&chapters[i].chapter->metadata,
1605                              "title", chapters[i].title, 0);
1606             max_start = chapters[i].start;
1607         }
1608
1609     matroska_convert_tags(s);
1610
1611     return 0;
1612 }
1613
1614 /*
1615  * Put one packet in an application-supplied AVPacket struct.
1616  * Returns 0 on success or -1 on failure.
1617  */
1618 static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
1619                                    AVPacket *pkt)
1620 {
1621     if (matroska->num_packets > 0) {
1622         memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
1623         av_free(matroska->packets[0]);
1624         if (matroska->num_packets > 1) {
1625             void *newpackets;
1626             memmove(&matroska->packets[0], &matroska->packets[1],
1627                     (matroska->num_packets - 1) * sizeof(AVPacket *));
1628             newpackets = av_realloc(matroska->packets,
1629                             (matroska->num_packets - 1) * sizeof(AVPacket *));
1630             if (newpackets)
1631                 matroska->packets = newpackets;
1632         } else {
1633             av_freep(&matroska->packets);
1634         }
1635         matroska->num_packets--;
1636         return 0;
1637     }
1638
1639     return -1;
1640 }
1641
1642 /*
1643  * Free all packets in our internal queue.
1644  */
1645 static void matroska_clear_queue(MatroskaDemuxContext *matroska)
1646 {
1647     if (matroska->packets) {
1648         int n;
1649         for (n = 0; n < matroska->num_packets; n++) {
1650             av_free_packet(matroska->packets[n]);
1651             av_free(matroska->packets[n]);
1652         }
1653         av_freep(&matroska->packets);
1654         matroska->num_packets = 0;
1655     }
1656 }
1657
1658 static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
1659                                 int size, int64_t pos, uint64_t cluster_time,
1660                                 uint64_t duration, int is_keyframe,
1661                                 int64_t cluster_pos)
1662 {
1663     uint64_t timecode = AV_NOPTS_VALUE;
1664     MatroskaTrack *track;
1665     int res = 0;
1666     AVStream *st;
1667     AVPacket *pkt;
1668     int16_t block_time;
1669     uint32_t *lace_size = NULL;
1670     int n, flags, laces = 0;
1671     uint64_t num;
1672
1673     if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
1674         av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
1675         return res;
1676     }
1677     data += n;
1678     size -= n;
1679
1680     track = matroska_find_track_by_num(matroska, num);
1681     if (!track || !track->stream) {
1682         av_log(matroska->ctx, AV_LOG_INFO,
1683                "Invalid stream %"PRIu64" or size %u\n", num, size);
1684         return AVERROR_INVALIDDATA;
1685     } else if (size <= 3)
1686         return 0;
1687     st = track->stream;
1688     if (st->discard >= AVDISCARD_ALL)
1689         return res;
1690     if (duration == AV_NOPTS_VALUE)
1691         duration = track->default_duration / matroska->time_scale;
1692
1693     block_time = AV_RB16(data);
1694     data += 2;
1695     flags = *data++;
1696     size -= 3;
1697     if (is_keyframe == -1)
1698         is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
1699
1700     if (cluster_time != (uint64_t)-1
1701         && (block_time >= 0 || cluster_time >= -block_time)) {
1702         timecode = cluster_time + block_time;
1703         if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE
1704             && timecode < track->end_timecode)
1705             is_keyframe = 0;  /* overlapping subtitles are not key frame */
1706         if (is_keyframe)
1707             av_add_index_entry(st, cluster_pos, timecode, 0,0,AVINDEX_KEYFRAME);
1708         track->end_timecode = FFMAX(track->end_timecode, timecode+duration);
1709     }
1710
1711     if (matroska->skip_to_keyframe && track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1712         if (!is_keyframe || timecode < matroska->skip_to_timecode)
1713             return res;
1714         matroska->skip_to_keyframe = 0;
1715     }
1716
1717     switch ((flags & 0x06) >> 1) {
1718         case 0x0: /* no lacing */
1719             laces = 1;
1720             lace_size = av_mallocz(sizeof(int));
1721             lace_size[0] = size;
1722             break;
1723
1724         case 0x1: /* Xiph lacing */
1725         case 0x2: /* fixed-size lacing */
1726         case 0x3: /* EBML lacing */
1727             assert(size>0); // size <=3 is checked before size-=3 above
1728             laces = (*data) + 1;
1729             data += 1;
1730             size -= 1;
1731             lace_size = av_mallocz(laces * sizeof(int));
1732
1733             switch ((flags & 0x06) >> 1) {
1734                 case 0x1: /* Xiph lacing */ {
1735                     uint8_t temp;
1736                     uint32_t total = 0;
1737                     for (n = 0; res == 0 && n < laces - 1; n++) {
1738                         while (1) {
1739                             if (size == 0) {
1740                                 res = -1;
1741                                 break;
1742                             }
1743                             temp = *data;
1744                             lace_size[n] += temp;
1745                             data += 1;
1746                             size -= 1;
1747                             if (temp != 0xff)
1748                                 break;
1749                         }
1750                         total += lace_size[n];
1751                     }
1752                     lace_size[n] = size - total;
1753                     break;
1754                 }
1755
1756                 case 0x2: /* fixed-size lacing */
1757                     for (n = 0; n < laces; n++)
1758                         lace_size[n] = size / laces;
1759                     break;
1760
1761                 case 0x3: /* EBML lacing */ {
1762                     uint32_t total;
1763                     n = matroska_ebmlnum_uint(matroska, data, size, &num);
1764                     if (n < 0) {
1765                         av_log(matroska->ctx, AV_LOG_INFO,
1766                                "EBML block data error\n");
1767                         break;
1768                     }
1769                     data += n;
1770                     size -= n;
1771                     total = lace_size[0] = num;
1772                     for (n = 1; res == 0 && n < laces - 1; n++) {
1773                         int64_t snum;
1774                         int r;
1775                         r = matroska_ebmlnum_sint(matroska, data, size, &snum);
1776                         if (r < 0) {
1777                             av_log(matroska->ctx, AV_LOG_INFO,
1778                                    "EBML block data error\n");
1779                             break;
1780                         }
1781                         data += r;
1782                         size -= r;
1783                         lace_size[n] = lace_size[n - 1] + snum;
1784                         total += lace_size[n];
1785                     }
1786                     lace_size[laces - 1] = size - total;
1787                     break;
1788                 }
1789             }
1790             break;
1791     }
1792
1793     if (res == 0) {
1794         for (n = 0; n < laces; n++) {
1795             if ((st->codec->codec_id == CODEC_ID_RA_288 ||
1796                  st->codec->codec_id == CODEC_ID_COOK ||
1797                  st->codec->codec_id == CODEC_ID_SIPR ||
1798                  st->codec->codec_id == CODEC_ID_ATRAC3) &&
1799                  st->codec->block_align && track->audio.sub_packet_size) {
1800                 int a = st->codec->block_align;
1801                 int sps = track->audio.sub_packet_size;
1802                 int cfs = track->audio.coded_framesize;
1803                 int h = track->audio.sub_packet_h;
1804                 int y = track->audio.sub_packet_cnt;
1805                 int w = track->audio.frame_size;
1806                 int x;
1807
1808                 if (!track->audio.pkt_cnt) {
1809                     if (track->audio.sub_packet_cnt == 0)
1810                         track->audio.buf_timecode = timecode;
1811                     if (st->codec->codec_id == CODEC_ID_RA_288) {
1812                         if (size < cfs * h / 2) {
1813                             av_log(matroska->ctx, AV_LOG_ERROR,
1814                                    "Corrupt int4 RM-style audio packet size\n");
1815                             res = AVERROR_INVALIDDATA;
1816                             goto end;
1817                         }
1818                         for (x=0; x<h/2; x++)
1819                             memcpy(track->audio.buf+x*2*w+y*cfs,
1820                                    data+x*cfs, cfs);
1821                     } else if (st->codec->codec_id == CODEC_ID_SIPR) {
1822                         if (size < w) {
1823                             av_log(matroska->ctx, AV_LOG_ERROR,
1824                                    "Corrupt sipr RM-style audio packet size\n");
1825                             res = AVERROR_INVALIDDATA;
1826                             goto end;
1827                         }
1828                         memcpy(track->audio.buf + y*w, data, w);
1829                     } else {
1830                         if (size < sps * w / sps) {
1831                             av_log(matroska->ctx, AV_LOG_ERROR,
1832                                    "Corrupt generic RM-style audio packet size\n");
1833                             res = AVERROR_INVALIDDATA;
1834                             goto end;
1835                         }
1836                         for (x=0; x<w/sps; x++)
1837                             memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
1838                     }
1839
1840                     if (++track->audio.sub_packet_cnt >= h) {
1841                         if (st->codec->codec_id == CODEC_ID_SIPR)
1842                             ff_rm_reorder_sipr_data(track->audio.buf, h, w);
1843                         track->audio.sub_packet_cnt = 0;
1844                         track->audio.pkt_cnt = h*w / a;
1845                     }
1846                 }
1847                 while (track->audio.pkt_cnt) {
1848                     pkt = av_mallocz(sizeof(AVPacket));
1849                     av_new_packet(pkt, a);
1850                     memcpy(pkt->data, track->audio.buf
1851                            + a * (h*w / a - track->audio.pkt_cnt--), a);
1852                     pkt->pts = track->audio.buf_timecode;
1853                     track->audio.buf_timecode = AV_NOPTS_VALUE;
1854                     pkt->pos = pos;
1855                     pkt->stream_index = st->index;
1856                     dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1857                 }
1858             } else {
1859                 MatroskaTrackEncoding *encodings = track->encodings.elem;
1860                 int offset = 0, pkt_size = lace_size[n];
1861                 uint8_t *pkt_data = data;
1862
1863                 if (pkt_size > size) {
1864                     av_log(matroska->ctx, AV_LOG_ERROR, "Invalid packet size\n");
1865                     break;
1866                 }
1867
1868                 if (encodings && encodings->scope & 1) {
1869                     offset = matroska_decode_buffer(&pkt_data,&pkt_size, track);
1870                     if (offset < 0)
1871                         continue;
1872                 }
1873
1874                 pkt = av_mallocz(sizeof(AVPacket));
1875                 /* XXX: prevent data copy... */
1876                 if (av_new_packet(pkt, pkt_size+offset) < 0) {
1877                     av_free(pkt);
1878                     res = AVERROR(ENOMEM);
1879                     break;
1880                 }
1881                 if (offset)
1882                     memcpy (pkt->data, encodings->compression.settings.data, offset);
1883                 memcpy (pkt->data+offset, pkt_data, pkt_size);
1884
1885                 if (pkt_data != data)
1886                     av_free(pkt_data);
1887
1888                 if (n == 0)
1889                     pkt->flags = is_keyframe;
1890                 pkt->stream_index = st->index;
1891
1892                 if (track->ms_compat)
1893                     pkt->dts = timecode;
1894                 else
1895                     pkt->pts = timecode;
1896                 pkt->pos = pos;
1897                 if (st->codec->codec_id == CODEC_ID_TEXT)
1898                     pkt->convergence_duration = duration;
1899                 else if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE)
1900                     pkt->duration = duration;
1901
1902                 if (st->codec->codec_id == CODEC_ID_SSA)
1903                     matroska_fix_ass_packet(matroska, pkt, duration);
1904
1905                 if (matroska->prev_pkt &&
1906                     timecode != AV_NOPTS_VALUE &&
1907                     matroska->prev_pkt->pts == timecode &&
1908                     matroska->prev_pkt->stream_index == st->index &&
1909                     st->codec->codec_id == CODEC_ID_SSA)
1910                     matroska_merge_packets(matroska->prev_pkt, pkt);
1911                 else {
1912                     dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1913                     matroska->prev_pkt = pkt;
1914                 }
1915             }
1916
1917             if (timecode != AV_NOPTS_VALUE)
1918                 timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
1919             data += lace_size[n];
1920             size -= lace_size[n];
1921         }
1922     }
1923
1924 end:
1925     av_free(lace_size);
1926     return res;
1927 }
1928
1929 static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
1930 {
1931     MatroskaCluster cluster = { 0 };
1932     EbmlList *blocks_list;
1933     MatroskaBlock *blocks;
1934     int i, res;
1935     int64_t pos = avio_tell(matroska->ctx->pb);
1936     matroska->prev_pkt = NULL;
1937     if (matroska->current_id)
1938         pos -= 4;  /* sizeof the ID which was already read */
1939     res = ebml_parse(matroska, matroska_clusters, &cluster);
1940     blocks_list = &cluster.blocks;
1941     blocks = blocks_list->elem;
1942     for (i=0; i<blocks_list->nb_elem && !res; i++)
1943         if (blocks[i].bin.size > 0 && blocks[i].bin.data) {
1944             int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
1945             if (!blocks[i].non_simple)
1946                 blocks[i].duration = AV_NOPTS_VALUE;
1947             res=matroska_parse_block(matroska,
1948                                      blocks[i].bin.data, blocks[i].bin.size,
1949                                      blocks[i].bin.pos,  cluster.timecode,
1950                                      blocks[i].duration, is_keyframe,
1951                                      pos);
1952         }
1953     ebml_free(matroska_cluster, &cluster);
1954     if (res < 0)  matroska->done = 1;
1955     return res;
1956 }
1957
1958 static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
1959 {
1960     MatroskaDemuxContext *matroska = s->priv_data;
1961     int ret = 0;
1962
1963     while (!ret && matroska_deliver_packet(matroska, pkt)) {
1964         if (matroska->done)
1965             return AVERROR_EOF;
1966         ret = matroska_parse_cluster(matroska);
1967     }
1968
1969     return ret;
1970 }
1971
1972 static int matroska_read_seek(AVFormatContext *s, int stream_index,
1973                               int64_t timestamp, int flags)
1974 {
1975     MatroskaDemuxContext *matroska = s->priv_data;
1976     MatroskaTrack *tracks = matroska->tracks.elem;
1977     AVStream *st = s->streams[stream_index];
1978     int i, index, index_sub, index_min;
1979
1980     /* Parse the CUES now since we need the index data to seek. */
1981     if (matroska->cues_parsing_deferred) {
1982         matroska_parse_cues(matroska);
1983         matroska->cues_parsing_deferred = 0;
1984     }
1985
1986     if (!st->nb_index_entries)
1987         return 0;
1988     timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
1989
1990     if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1991         avio_seek(s->pb, st->index_entries[st->nb_index_entries-1].pos, SEEK_SET);
1992         matroska->current_id = 0;
1993         while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1994             matroska_clear_queue(matroska);
1995             if (matroska_parse_cluster(matroska) < 0)
1996                 break;
1997         }
1998     }
1999
2000     matroska_clear_queue(matroska);
2001     if (index < 0)
2002         return 0;
2003
2004     index_min = index;
2005     for (i=0; i < matroska->tracks.nb_elem; i++) {
2006         tracks[i].audio.pkt_cnt = 0;
2007         tracks[i].audio.sub_packet_cnt = 0;
2008         tracks[i].audio.buf_timecode = AV_NOPTS_VALUE;
2009         tracks[i].end_timecode = 0;
2010         if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE
2011             && !tracks[i].stream->discard != AVDISCARD_ALL) {
2012             index_sub = av_index_search_timestamp(tracks[i].stream, st->index_entries[index].timestamp, AVSEEK_FLAG_BACKWARD);
2013             if (index_sub >= 0
2014                 && st->index_entries[index_sub].pos < st->index_entries[index_min].pos
2015                 && st->index_entries[index].timestamp - st->index_entries[index_sub].timestamp < 30000000000/matroska->time_scale)
2016                 index_min = index_sub;
2017         }
2018     }
2019
2020     avio_seek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
2021     matroska->current_id = 0;
2022     matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
2023     matroska->skip_to_timecode = st->index_entries[index].timestamp;
2024     matroska->done = 0;
2025     ff_update_cur_dts(s, st, st->index_entries[index].timestamp);
2026     return 0;
2027 }
2028
2029 static int matroska_read_close(AVFormatContext *s)
2030 {
2031     MatroskaDemuxContext *matroska = s->priv_data;
2032     MatroskaTrack *tracks = matroska->tracks.elem;
2033     int n;
2034
2035     matroska_clear_queue(matroska);
2036
2037     for (n=0; n < matroska->tracks.nb_elem; n++)
2038         if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
2039             av_free(tracks[n].audio.buf);
2040     ebml_free(matroska_segment, matroska);
2041
2042     return 0;
2043 }
2044
2045 AVInputFormat ff_matroska_demuxer = {
2046     .name           = "matroska,webm",
2047     .long_name      = NULL_IF_CONFIG_SMALL("Matroska/WebM file format"),
2048     .priv_data_size = sizeof(MatroskaDemuxContext),
2049     .read_probe     = matroska_probe,
2050     .read_header    = matroska_read_header,
2051     .read_packet    = matroska_read_packet,
2052     .read_close     = matroska_read_close,
2053     .read_seek      = matroska_read_seek,
2054 };