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

   1 /*
   2  * Matroska file demuxer
   3  * Copyright (c) 2003-2008 The FFmpeg Project
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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 /* For ff_codec_get_id(). */
  35 #include "riff.h"
  36 #include "isom.h"
  37 #include "rm.h"
  38 #include "matroska.h"
  39 #include "libavcodec/mpeg4audio.h"
  40 #include "libavutil/intfloat_readwrite.h"
  41 #include "libavutil/intreadwrite.h"
  42 #include "libavutil/avstring.h"
  43 #include "libavutil/lzo.h"
  44 #if CONFIG_ZLIB
  45 #include <zlib.h>
  46 #endif
  47 #if CONFIG_BZLIB
  48 #include <bzlib.h>
  49 #endif
  50
  51 typedef enum {
  52     EBML_NONE,
  53     EBML_UINT,
  54     EBML_FLOAT,
  55     EBML_STR,
  56     EBML_UTF8,
  57     EBML_BIN,
  58     EBML_NEST,
  59     EBML_PASS,
  60     EBML_STOP,
  61 } EbmlType;
  62
  63 typedef const struct EbmlSyntax {
  64     uint32_t id;
  65     EbmlType type;
  66     int list_elem_size;
  67     int data_offset;
  68     union {
  69         uint64_t    u;
  70         double      f;
  71         const char *s;
  72         const struct EbmlSyntax *n;
  73     } def;
  74 } EbmlSyntax;
  75
  76 typedef struct {
  77     int nb_elem;
  78     void *elem;
  79 } EbmlList;
  80
  81 typedef struct {
  82     int      size;
  83     uint8_t *data;
  84     int64_t  pos;
  85 } EbmlBin;
  86
  87 typedef struct {
  88     uint64_t version;
  89     uint64_t max_size;
  90     uint64_t id_length;
  91     char    *doctype;
  92     uint64_t doctype_version;
  93 } Ebml;
  94
  95 typedef struct {
  96     uint64_t algo;
  97     EbmlBin  settings;
  98 } MatroskaTrackCompression;
  99
 100 typedef struct {
 101     uint64_t scope;
 102     uint64_t type;
 103     MatroskaTrackCompression compression;
 104 } MatroskaTrackEncoding;
 105
 106 typedef struct {
 107     double   frame_rate;
 108     uint64_t display_width;
 109     uint64_t display_height;
 110     uint64_t pixel_width;
 111     uint64_t pixel_height;
 112     uint64_t fourcc;
 113 } MatroskaTrackVideo;
 114
 115 typedef struct {
 116     double   samplerate;
 117     double   out_samplerate;
 118     uint64_t bitdepth;
 119     uint64_t channels;
 120
 121     /* real audio header (extracted from extradata) */
 122     int      coded_framesize;
 123     int      sub_packet_h;
 124     int      frame_size;
 125     int      sub_packet_size;
 126     int      sub_packet_cnt;
 127     int      pkt_cnt;
 128     uint8_t *buf;
 129 } MatroskaTrackAudio;
 130
 131 typedef struct {
 132     uint64_t num;
 133     uint64_t uid;
 134     uint64_t type;
 135     char    *name;
 136     char    *codec_id;
 137     EbmlBin  codec_priv;
 138     char    *language;
 139     double time_scale;
 140     uint64_t default_duration;
 141     uint64_t flag_default;
 142     MatroskaTrackVideo video;
 143     MatroskaTrackAudio audio;
 144     EbmlList encodings;
 145
 146     AVStream *stream;
 147     int64_t end_timecode;
 148     int ms_compat;
 149 } MatroskaTrack;
 150
 151 typedef struct {
 152     uint64_t uid;
 153     char *filename;
 154     char *mime;
 155     EbmlBin bin;
 156
 157     AVStream *stream;
 158 } MatroskaAttachement;
 159
 160 typedef struct {
 161     uint64_t start;
 162     uint64_t end;
 163     uint64_t uid;
 164     char    *title;
 165
 166     AVChapter *chapter;
 167 } MatroskaChapter;
 168
 169 typedef struct {
 170     uint64_t track;
 171     uint64_t pos;
 172 } MatroskaIndexPos;
 173
 174 typedef struct {
 175     uint64_t time;
 176     EbmlList pos;
 177 } MatroskaIndex;
 178
 179 typedef struct {
 180     char *name;
 181     char *string;
 182     char *lang;
 183     uint64_t def;
 184     EbmlList sub;
 185 } MatroskaTag;
 186
 187 typedef struct {
 188     char    *type;
 189     uint64_t typevalue;
 190     uint64_t trackuid;
 191     uint64_t chapteruid;
 192     uint64_t attachuid;
 193 } MatroskaTagTarget;
 194
 195 typedef struct {
 196     MatroskaTagTarget target;
 197     EbmlList tag;
 198 } MatroskaTags;
 199
 200 typedef struct {
 201     uint64_t id;
 202     uint64_t pos;
 203 } MatroskaSeekhead;
 204
 205 typedef struct {
 206     uint64_t start;
 207     uint64_t length;
 208 } MatroskaLevel;
 209
 210 typedef struct {
 211     AVFormatContext *ctx;
 212
 213     /* EBML stuff */
 214     int num_levels;
 215     MatroskaLevel levels[EBML_MAX_DEPTH];
 216     int level_up;
 217
 218     uint64_t time_scale;
 219     double   duration;
 220     char    *title;
 221     EbmlList tracks;
 222     EbmlList attachments;
 223     EbmlList chapters;
 224     EbmlList index;
 225     EbmlList tags;
 226     EbmlList seekhead;
 227
 228     /* byte position of the segment inside the stream */
 229     int64_t segment_start;
 230
 231     /* the packet queue */
 232     AVPacket **packets;
 233     int num_packets;
 234     AVPacket *prev_pkt;
 235
 236     int done;
 237     int has_cluster_id;
 238
 239     /* What to skip before effectively reading a packet. */
 240     int skip_to_keyframe;
 241     uint64_t skip_to_timecode;
 242 } MatroskaDemuxContext;
 243
 244 typedef struct {
 245     uint64_t duration;
 246     int64_t  reference;
 247     uint64_t non_simple;
 248     EbmlBin  bin;
 249 } MatroskaBlock;
 250
 251 typedef struct {
 252     uint64_t timecode;
 253     EbmlList blocks;
 254 } MatroskaCluster;
 255
 256 static EbmlSyntax ebml_header[] = {
 257     { EBML_ID_EBMLREADVERSION,        EBML_UINT, 0, offsetof(Ebml,version), {.u=EBML_VERSION} },
 258     { EBML_ID_EBMLMAXSIZELENGTH,      EBML_UINT, 0, offsetof(Ebml,max_size), {.u=8} },
 259     { EBML_ID_EBMLMAXIDLENGTH,        EBML_UINT, 0, offsetof(Ebml,id_length), {.u=4} },
 260     { EBML_ID_DOCTYPE,                EBML_STR,  0, offsetof(Ebml,doctype), {.s="(none)"} },
 261     { EBML_ID_DOCTYPEREADVERSION,     EBML_UINT, 0, offsetof(Ebml,doctype_version), {.u=1} },
 262     { EBML_ID_EBMLVERSION,            EBML_NONE },
 263     { EBML_ID_DOCTYPEVERSION,         EBML_NONE },
 264     { 0 }
 265 };
 266
 267 static EbmlSyntax ebml_syntax[] = {
 268     { EBML_ID_HEADER,                 EBML_NEST, 0, 0, {.n=ebml_header} },
 269     { 0 }
 270 };
 271
 272 static EbmlSyntax matroska_info[] = {
 273     { MATROSKA_ID_TIMECODESCALE,      EBML_UINT,  0, offsetof(MatroskaDemuxContext,time_scale), {.u=1000000} },
 274     { MATROSKA_ID_DURATION,           EBML_FLOAT, 0, offsetof(MatroskaDemuxContext,duration) },
 275     { MATROSKA_ID_TITLE,              EBML_UTF8,  0, offsetof(MatroskaDemuxContext,title) },
 276     { MATROSKA_ID_WRITINGAPP,         EBML_NONE },
 277     { MATROSKA_ID_MUXINGAPP,          EBML_NONE },
 278     { MATROSKA_ID_DATEUTC,            EBML_NONE },
 279     { MATROSKA_ID_SEGMENTUID,         EBML_NONE },
 280     { 0 }
 281 };
 282
 283 static EbmlSyntax matroska_track_video[] = {
 284     { MATROSKA_ID_VIDEOFRAMERATE,     EBML_FLOAT,0, offsetof(MatroskaTrackVideo,frame_rate) },
 285     { MATROSKA_ID_VIDEODISPLAYWIDTH,  EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_width) },
 286     { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_height) },
 287     { MATROSKA_ID_VIDEOPIXELWIDTH,    EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_width) },
 288     { MATROSKA_ID_VIDEOPIXELHEIGHT,   EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_height) },
 289     { MATROSKA_ID_VIDEOCOLORSPACE,    EBML_UINT, 0, offsetof(MatroskaTrackVideo,fourcc) },
 290     { MATROSKA_ID_VIDEOPIXELCROPB,    EBML_NONE },
 291     { MATROSKA_ID_VIDEOPIXELCROPT,    EBML_NONE },
 292     { MATROSKA_ID_VIDEOPIXELCROPL,    EBML_NONE },
 293     { MATROSKA_ID_VIDEOPIXELCROPR,    EBML_NONE },
 294     { MATROSKA_ID_VIDEODISPLAYUNIT,   EBML_NONE },
 295     { MATROSKA_ID_VIDEOFLAGINTERLACED,EBML_NONE },
 296     { MATROSKA_ID_VIDEOSTEREOMODE,    EBML_NONE },
 297     { MATROSKA_ID_VIDEOASPECTRATIO,   EBML_NONE },
 298     { 0 }
 299 };
 300
 301 static EbmlSyntax matroska_track_audio[] = {
 302     { MATROSKA_ID_AUDIOSAMPLINGFREQ,  EBML_FLOAT,0, offsetof(MatroskaTrackAudio,samplerate), {.f=8000.0} },
 303     { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ,EBML_FLOAT,0,offsetof(MatroskaTrackAudio,out_samplerate) },
 304     { MATROSKA_ID_AUDIOBITDEPTH,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,bitdepth) },
 305     { MATROSKA_ID_AUDIOCHANNELS,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,channels), {.u=1} },
 306     { 0 }
 307 };
 308
 309 static EbmlSyntax matroska_track_encoding_compression[] = {
 310     { MATROSKA_ID_ENCODINGCOMPALGO,   EBML_UINT, 0, offsetof(MatroskaTrackCompression,algo), {.u=0} },
 311     { MATROSKA_ID_ENCODINGCOMPSETTINGS,EBML_BIN, 0, offsetof(MatroskaTrackCompression,settings) },
 312     { 0 }
 313 };
 314
 315 static EbmlSyntax matroska_track_encoding[] = {
 316     { MATROSKA_ID_ENCODINGSCOPE,      EBML_UINT, 0, offsetof(MatroskaTrackEncoding,scope), {.u=1} },
 317     { MATROSKA_ID_ENCODINGTYPE,       EBML_UINT, 0, offsetof(MatroskaTrackEncoding,type), {.u=0} },
 318     { MATROSKA_ID_ENCODINGCOMPRESSION,EBML_NEST, 0, offsetof(MatroskaTrackEncoding,compression), {.n=matroska_track_encoding_compression} },
 319     { MATROSKA_ID_ENCODINGORDER,      EBML_NONE },
 320     { 0 }
 321 };
 322
 323 static EbmlSyntax matroska_track_encodings[] = {
 324     { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack,encodings), {.n=matroska_track_encoding} },
 325     { 0 }
 326 };
 327
 328 static EbmlSyntax matroska_track[] = {
 329     { MATROSKA_ID_TRACKNUMBER,          EBML_UINT, 0, offsetof(MatroskaTrack,num) },
 330     { MATROSKA_ID_TRACKNAME,            EBML_UTF8, 0, offsetof(MatroskaTrack,name) },
 331     { MATROSKA_ID_TRACKUID,             EBML_UINT, 0, offsetof(MatroskaTrack,uid) },
 332     { MATROSKA_ID_TRACKTYPE,            EBML_UINT, 0, offsetof(MatroskaTrack,type) },
 333     { MATROSKA_ID_CODECID,              EBML_STR,  0, offsetof(MatroskaTrack,codec_id) },
 334     { MATROSKA_ID_CODECPRIVATE,         EBML_BIN,  0, offsetof(MatroskaTrack,codec_priv) },
 335     { MATROSKA_ID_TRACKLANGUAGE,        EBML_UTF8, 0, offsetof(MatroskaTrack,language), {.s="eng"} },
 336     { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack,default_duration) },
 337     { MATROSKA_ID_TRACKTIMECODESCALE,   EBML_FLOAT,0, offsetof(MatroskaTrack,time_scale), {.f=1.0} },
 338     { MATROSKA_ID_TRACKFLAGDEFAULT,     EBML_UINT, 0, offsetof(MatroskaTrack,flag_default), {.u=1} },
 339     { MATROSKA_ID_TRACKVIDEO,           EBML_NEST, 0, offsetof(MatroskaTrack,video), {.n=matroska_track_video} },
 340     { MATROSKA_ID_TRACKAUDIO,           EBML_NEST, 0, offsetof(MatroskaTrack,audio), {.n=matroska_track_audio} },
 341     { MATROSKA_ID_TRACKCONTENTENCODINGS,EBML_NEST, 0, 0, {.n=matroska_track_encodings} },
 342     { MATROSKA_ID_TRACKFLAGENABLED,     EBML_NONE },
 343     { MATROSKA_ID_TRACKFLAGFORCED,      EBML_NONE },
 344     { MATROSKA_ID_TRACKFLAGLACING,      EBML_NONE },
 345     { MATROSKA_ID_CODECNAME,            EBML_NONE },
 346     { MATROSKA_ID_CODECDECODEALL,       EBML_NONE },
 347     { MATROSKA_ID_CODECINFOURL,         EBML_NONE },
 348     { MATROSKA_ID_CODECDOWNLOADURL,     EBML_NONE },
 349     { MATROSKA_ID_TRACKMINCACHE,        EBML_NONE },
 350     { MATROSKA_ID_TRACKMAXCACHE,        EBML_NONE },
 351     { MATROSKA_ID_TRACKMAXBLKADDID,     EBML_NONE },
 352     { 0 }
 353 };
 354
 355 static EbmlSyntax matroska_tracks[] = {
 356     { MATROSKA_ID_TRACKENTRY,         EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext,tracks), {.n=matroska_track} },
 357     { 0 }
 358 };
 359
 360 static EbmlSyntax matroska_attachment[] = {
 361     { MATROSKA_ID_FILEUID,            EBML_UINT, 0, offsetof(MatroskaAttachement,uid) },
 362     { MATROSKA_ID_FILENAME,           EBML_UTF8, 0, offsetof(MatroskaAttachement,filename) },
 363     { MATROSKA_ID_FILEMIMETYPE,       EBML_STR,  0, offsetof(MatroskaAttachement,mime) },
 364     { MATROSKA_ID_FILEDATA,           EBML_BIN,  0, offsetof(MatroskaAttachement,bin) },
 365     { MATROSKA_ID_FILEDESC,           EBML_NONE },
 366     { 0 }
 367 };
 368
 369 static EbmlSyntax matroska_attachments[] = {
 370     { MATROSKA_ID_ATTACHEDFILE,       EBML_NEST, sizeof(MatroskaAttachement), offsetof(MatroskaDemuxContext,attachments), {.n=matroska_attachment} },
 371     { 0 }
 372 };
 373
 374 static EbmlSyntax matroska_chapter_display[] = {
 375     { MATROSKA_ID_CHAPSTRING,         EBML_UTF8, 0, offsetof(MatroskaChapter,title) },
 376     { MATROSKA_ID_CHAPLANG,           EBML_NONE },
 377     { 0 }
 378 };
 379
 380 static EbmlSyntax matroska_chapter_entry[] = {
 381     { MATROSKA_ID_CHAPTERTIMESTART,   EBML_UINT, 0, offsetof(MatroskaChapter,start), {.u=AV_NOPTS_VALUE} },
 382     { MATROSKA_ID_CHAPTERTIMEEND,     EBML_UINT, 0, offsetof(MatroskaChapter,end), {.u=AV_NOPTS_VALUE} },
 383     { MATROSKA_ID_CHAPTERUID,         EBML_UINT, 0, offsetof(MatroskaChapter,uid) },
 384     { MATROSKA_ID_CHAPTERDISPLAY,     EBML_NEST, 0, 0, {.n=matroska_chapter_display} },
 385     { MATROSKA_ID_CHAPTERFLAGHIDDEN,  EBML_NONE },
 386     { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
 387     { MATROSKA_ID_CHAPTERPHYSEQUIV,   EBML_NONE },
 388     { MATROSKA_ID_CHAPTERATOM,        EBML_NONE },
 389     { 0 }
 390 };
 391
 392 static EbmlSyntax matroska_chapter[] = {
 393     { MATROSKA_ID_CHAPTERATOM,        EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext,chapters), {.n=matroska_chapter_entry} },
 394     { MATROSKA_ID_EDITIONUID,         EBML_NONE },
 395     { MATROSKA_ID_EDITIONFLAGHIDDEN,  EBML_NONE },
 396     { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
 397     { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
 398     { 0 }
 399 };
 400
 401 static EbmlSyntax matroska_chapters[] = {
 402     { MATROSKA_ID_EDITIONENTRY,       EBML_NEST, 0, 0, {.n=matroska_chapter} },
 403     { 0 }
 404 };
 405
 406 static EbmlSyntax matroska_index_pos[] = {
 407     { MATROSKA_ID_CUETRACK,           EBML_UINT, 0, offsetof(MatroskaIndexPos,track) },
 408     { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos,pos)   },
 409     { MATROSKA_ID_CUEBLOCKNUMBER,     EBML_NONE },
 410     { 0 }
 411 };
 412
 413 static EbmlSyntax matroska_index_entry[] = {
 414     { MATROSKA_ID_CUETIME,            EBML_UINT, 0, offsetof(MatroskaIndex,time) },
 415     { MATROSKA_ID_CUETRACKPOSITION,   EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex,pos), {.n=matroska_index_pos} },
 416     { 0 }
 417 };
 418
 419 static EbmlSyntax matroska_index[] = {
 420     { MATROSKA_ID_POINTENTRY,         EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext,index), {.n=matroska_index_entry} },
 421     { 0 }
 422 };
 423
 424 static EbmlSyntax matroska_simpletag[] = {
 425     { MATROSKA_ID_TAGNAME,            EBML_UTF8, 0, offsetof(MatroskaTag,name) },
 426     { MATROSKA_ID_TAGSTRING,          EBML_UTF8, 0, offsetof(MatroskaTag,string) },
 427     { MATROSKA_ID_TAGLANG,            EBML_STR,  0, offsetof(MatroskaTag,lang), {.s="und"} },
 428     { MATROSKA_ID_TAGDEFAULT,         EBML_UINT, 0, offsetof(MatroskaTag,def) },
 429     { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag,sub), {.n=matroska_simpletag} },
 430     { 0 }
 431 };
 432
 433 static EbmlSyntax matroska_tagtargets[] = {
 434     { MATROSKA_ID_TAGTARGETS_TYPE,      EBML_STR,  0, offsetof(MatroskaTagTarget,type) },
 435     { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget,typevalue), {.u=50} },
 436     { MATROSKA_ID_TAGTARGETS_TRACKUID,  EBML_UINT, 0, offsetof(MatroskaTagTarget,trackuid) },
 437     { MATROSKA_ID_TAGTARGETS_CHAPTERUID,EBML_UINT, 0, offsetof(MatroskaTagTarget,chapteruid) },
 438     { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget,attachuid) },
 439     { 0 }
 440 };
 441
 442 static EbmlSyntax matroska_tag[] = {
 443     { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags,tag), {.n=matroska_simpletag} },
 444     { MATROSKA_ID_TAGTARGETS,         EBML_NEST, 0, offsetof(MatroskaTags,target), {.n=matroska_tagtargets} },
 445     { 0 }
 446 };
 447
 448 static EbmlSyntax matroska_tags[] = {
 449     { MATROSKA_ID_TAG,                EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext,tags), {.n=matroska_tag} },
 450     { 0 }
 451 };
 452
 453 static EbmlSyntax matroska_seekhead_entry[] = {
 454     { MATROSKA_ID_SEEKID,             EBML_UINT, 0, offsetof(MatroskaSeekhead,id) },
 455     { MATROSKA_ID_SEEKPOSITION,       EBML_UINT, 0, offsetof(MatroskaSeekhead,pos), {.u=-1} },
 456     { 0 }
 457 };
 458
 459 static EbmlSyntax matroska_seekhead[] = {
 460     { MATROSKA_ID_SEEKENTRY,          EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext,seekhead), {.n=matroska_seekhead_entry} },
 461     { 0 }
 462 };
 463
 464 static EbmlSyntax matroska_segment[] = {
 465     { MATROSKA_ID_INFO,           EBML_NEST, 0, 0, {.n=matroska_info       } },
 466     { MATROSKA_ID_TRACKS,         EBML_NEST, 0, 0, {.n=matroska_tracks     } },
 467     { MATROSKA_ID_ATTACHMENTS,    EBML_NEST, 0, 0, {.n=matroska_attachments} },
 468     { MATROSKA_ID_CHAPTERS,       EBML_NEST, 0, 0, {.n=matroska_chapters   } },
 469     { MATROSKA_ID_CUES,           EBML_NEST, 0, 0, {.n=matroska_index      } },
 470     { MATROSKA_ID_TAGS,           EBML_NEST, 0, 0, {.n=matroska_tags       } },
 471     { MATROSKA_ID_SEEKHEAD,       EBML_NEST, 0, 0, {.n=matroska_seekhead   } },
 472     { MATROSKA_ID_CLUSTER,        EBML_STOP, 0, offsetof(MatroskaDemuxContext,has_cluster_id) },
 473     { 0 }
 474 };
 475
 476 static EbmlSyntax matroska_segments[] = {
 477     { MATROSKA_ID_SEGMENT,        EBML_NEST, 0, 0, {.n=matroska_segment    } },
 478     { 0 }
 479 };
 480
 481 static EbmlSyntax matroska_blockgroup[] = {
 482     { MATROSKA_ID_BLOCK,          EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
 483     { MATROSKA_ID_SIMPLEBLOCK,    EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
 484     { MATROSKA_ID_BLOCKDURATION,  EBML_UINT, 0, offsetof(MatroskaBlock,duration), {.u=AV_NOPTS_VALUE} },
 485     { MATROSKA_ID_BLOCKREFERENCE, EBML_UINT, 0, offsetof(MatroskaBlock,reference) },
 486     { 1,                          EBML_UINT, 0, offsetof(MatroskaBlock,non_simple), {.u=1} },
 487     { 0 }
 488 };
 489
 490 static EbmlSyntax matroska_cluster[] = {
 491     { MATROSKA_ID_CLUSTERTIMECODE,EBML_UINT,0, offsetof(MatroskaCluster,timecode) },
 492     { MATROSKA_ID_BLOCKGROUP,     EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
 493     { MATROSKA_ID_SIMPLEBLOCK,    EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
 494     { MATROSKA_ID_CLUSTERPOSITION,EBML_NONE },
 495     { MATROSKA_ID_CLUSTERPREVSIZE,EBML_NONE },
 496     { 0 }
 497 };
 498
 499 static EbmlSyntax matroska_clusters[] = {
 500     { MATROSKA_ID_CLUSTER,        EBML_NEST, 0, 0, {.n=matroska_cluster} },
 501     { MATROSKA_ID_INFO,           EBML_NONE },
 502     { MATROSKA_ID_CUES,           EBML_NONE },
 503     { MATROSKA_ID_TAGS,           EBML_NONE },
 504     { MATROSKA_ID_SEEKHEAD,       EBML_NONE },
 505     { 0 }
 506 };
 507
 508 /*
 509  * Return: Whether we reached the end of a level in the hierarchy or not.
 510  */
 511 static int ebml_level_end(MatroskaDemuxContext *matroska)
 512 {
 513     ByteIOContext *pb = matroska->ctx->pb;
 514     int64_t pos = url_ftell(pb);
 515
 516     if (matroska->num_levels > 0) {
 517         MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
 518         if (pos - level->start >= level->length) {
 519             matroska->num_levels--;
 520             return 1;
 521         }
 522     }
 523     return 0;
 524 }
 525
 526 /*
 527  * Read: an "EBML number", which is defined as a variable-length
 528  * array of bytes. The first byte indicates the length by giving a
 529  * number of 0-bits followed by a one. The position of the first
 530  * "one" bit inside the first byte indicates the length of this
 531  * number.
 532  * Returns: number of bytes read, < 0 on error
 533  */
 534 static int ebml_read_num(MatroskaDemuxContext *matroska, ByteIOContext *pb,
 535                          int max_size, uint64_t *number)
 536 {
 537     int len_mask = 0x80, read = 1, n = 1;
 538     int64_t total = 0;
 539
 540     /* The first byte tells us the length in bytes - get_byte() can normally
 541      * return 0, but since that's not a valid first ebmlID byte, we can
 542      * use it safely here to catch EOS. */
 543     if (!(total = get_byte(pb))) {
 544         /* we might encounter EOS here */
 545         if (!url_feof(pb)) {
 546             int64_t pos = url_ftell(pb);
 547             av_log(matroska->ctx, AV_LOG_ERROR,
 548                    "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
 549                    pos, pos);
 550         }
 551         return AVERROR(EIO); /* EOS or actual I/O error */
 552     }
 553
 554     /* get the length of the EBML number */
 555     while (read <= max_size && !(total & len_mask)) {
 556         read++;
 557         len_mask >>= 1;
 558     }
 559     if (read > max_size) {
 560         int64_t pos = url_ftell(pb) - 1;
 561         av_log(matroska->ctx, AV_LOG_ERROR,
 562                "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
 563                (uint8_t) total, pos, pos);
 564         return AVERROR_INVALIDDATA;
 565     }
 566
 567     /* read out length */
 568     total &= ~len_mask;
 569     while (n++ < read)
 570         total = (total << 8) | get_byte(pb);
 571
 572     *number = total;
 573
 574     return read;
 575 }
 576
 577 /*
 578  * Read the next element as an unsigned int.
 579  * 0 is success, < 0 is failure.
 580  */
 581 static int ebml_read_uint(ByteIOContext *pb, int size, uint64_t *num)
 582 {
 583     int n = 0;
 584
 585     if (size < 1 || size > 8)
 586         return AVERROR_INVALIDDATA;
 587
 588     /* big-endian ordering; build up number */
 589     *num = 0;
 590     while (n++ < size)
 591         *num = (*num << 8) | get_byte(pb);
 592
 593     return 0;
 594 }
 595
 596 /*
 597  * Read the next element as a float.
 598  * 0 is success, < 0 is failure.
 599  */
 600 static int ebml_read_float(ByteIOContext *pb, int size, double *num)
 601 {
 602     if (size == 4) {
 603         *num= av_int2flt(get_be32(pb));
 604     } else if(size==8){
 605         *num= av_int2dbl(get_be64(pb));
 606     } else
 607         return AVERROR_INVALIDDATA;
 608
 609     return 0;
 610 }
 611
 612 /*
 613  * Read the next element as an ASCII string.
 614  * 0 is success, < 0 is failure.
 615  */
 616 static int ebml_read_ascii(ByteIOContext *pb, int size, char **str)
 617 {
 618     av_free(*str);
 619     /* EBML strings are usually not 0-terminated, so we allocate one
 620      * byte more, read the string and NULL-terminate it ourselves. */
 621     if (!(*str = av_malloc(size + 1)))
 622         return AVERROR(ENOMEM);
 623     if (get_buffer(pb, (uint8_t *) *str, size) != size) {
 624         av_free(*str);
 625         return AVERROR(EIO);
 626     }
 627     (*str)[size] = '\0';
 628
 629     return 0;
 630 }
 631
 632 /*
 633  * Read the next element as binary data.
 634  * 0 is success, < 0 is failure.
 635  */
 636 static int ebml_read_binary(ByteIOContext *pb, int length, EbmlBin *bin)
 637 {
 638     av_free(bin->data);
 639     if (!(bin->data = av_malloc(length)))
 640         return AVERROR(ENOMEM);
 641
 642     bin->size = length;
 643     bin->pos  = url_ftell(pb);
 644     if (get_buffer(pb, bin->data, length) != length)
 645         return AVERROR(EIO);
 646
 647     return 0;
 648 }
 649
 650 /*
 651  * Read the next element, but only the header. The contents
 652  * are supposed to be sub-elements which can be read separately.
 653  * 0 is success, < 0 is failure.
 654  */
 655 static int ebml_read_master(MatroskaDemuxContext *matroska, int length)
 656 {
 657     ByteIOContext *pb = matroska->ctx->pb;
 658     MatroskaLevel *level;
 659
 660     if (matroska->num_levels >= EBML_MAX_DEPTH) {
 661         av_log(matroska->ctx, AV_LOG_ERROR,
 662                "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
 663         return AVERROR(ENOSYS);
 664     }
 665
 666     level = &matroska->levels[matroska->num_levels++];
 667     level->start = url_ftell(pb);
 668     level->length = length;
 669
 670     return 0;
 671 }
 672
 673 /*
 674  * Read signed/unsigned "EBML" numbers.
 675  * Return: number of bytes processed, < 0 on error
 676  */
 677 static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
 678                                  uint8_t *data, uint32_t size, uint64_t *num)
 679 {
 680     ByteIOContext pb;
 681     init_put_byte(&pb, data, size, 0, NULL, NULL, NULL, NULL);
 682     return ebml_read_num(matroska, &pb, 8, num);
 683 }
 684
 685 /*
 686  * Same as above, but signed.
 687  */
 688 static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
 689                                  uint8_t *data, uint32_t size, int64_t *num)
 690 {
 691     uint64_t unum;
 692     int res;
 693
 694     /* read as unsigned number first */
 695     if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
 696         return res;
 697
 698     /* make signed (weird way) */
 699     *num = unum - ((1LL << (7*res - 1)) - 1);
 700
 701     return res;
 702 }
 703
 704 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
 705                            EbmlSyntax *syntax, void *data);
 706
 707 static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
 708                          uint32_t id, void *data)
 709 {
 710     int i;
 711     for (i=0; syntax[i].id; i++)
 712         if (id == syntax[i].id)
 713             break;
 714     if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32)
 715         av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
 716     return ebml_parse_elem(matroska, &syntax[i], data);
 717 }
 718
 719 static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
 720                       void *data)
 721 {
 722     uint64_t id;
 723     int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
 724     id |= 1 << 7*res;
 725     return res < 0 ? res : ebml_parse_id(matroska, syntax, id, data);
 726 }
 727
 728 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
 729                            void *data)
 730 {
 731     int i, res = 0;
 732
 733     for (i=0; syntax[i].id; i++)
 734         switch (syntax[i].type) {
 735         case EBML_UINT:
 736             *(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
 737             break;
 738         case EBML_FLOAT:
 739             *(double   *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
 740             break;
 741         case EBML_STR:
 742         case EBML_UTF8:
 743             *(char    **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
 744             break;
 745         }
 746
 747     while (!res && !ebml_level_end(matroska))
 748         res = ebml_parse(matroska, syntax, data);
 749
 750     return res;
 751 }
 752
 753 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
 754                            EbmlSyntax *syntax, void *data)
 755 {
 756     ByteIOContext *pb = matroska->ctx->pb;
 757     uint32_t id = syntax->id;
 758     uint64_t length;
 759     int res;
 760
 761     data = (char *)data + syntax->data_offset;
 762     if (syntax->list_elem_size) {
 763         EbmlList *list = data;
 764         list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
 765         data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
 766         memset(data, 0, syntax->list_elem_size);
 767         list->nb_elem++;
 768     }
 769
 770     if (syntax->type != EBML_PASS && syntax->type != EBML_STOP)
 771         if ((res = ebml_read_num(matroska, pb, 8, &length)) < 0)
 772             return res;
 773
 774     switch (syntax->type) {
 775     case EBML_UINT:  res = ebml_read_uint  (pb, length, data);  break;
 776     case EBML_FLOAT: res = ebml_read_float (pb, length, data);  break;
 777     case EBML_STR:
 778     case EBML_UTF8:  res = ebml_read_ascii (pb, length, data);  break;
 779     case EBML_BIN:   res = ebml_read_binary(pb, length, data);  break;
 780     case EBML_NEST:  if ((res=ebml_read_master(matroska, length)) < 0)
 781                          return res;
 782                      if (id == MATROSKA_ID_SEGMENT)
 783                          matroska->segment_start = url_ftell(matroska->ctx->pb);
 784                      return ebml_parse_nest(matroska, syntax->def.n, data);
 785     case EBML_PASS:  return ebml_parse_id(matroska, syntax->def.n, id, data);
 786     case EBML_STOP:  *(int *)data = 1;      return 1;
 787     default:         return url_fseek(pb,length,SEEK_CUR)<0 ? AVERROR(EIO) : 0;
 788     }
 789     if (res == AVERROR_INVALIDDATA)
 790         av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
 791     else if (res == AVERROR(EIO))
 792         av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
 793     return res;
 794 }
 795
 796 static void ebml_free(EbmlSyntax *syntax, void *data)
 797 {
 798     int i, j;
 799     for (i=0; syntax[i].id; i++) {
 800         void *data_off = (char *)data + syntax[i].data_offset;
 801         switch (syntax[i].type) {
 802         case EBML_STR:
 803         case EBML_UTF8:  av_freep(data_off);                      break;
 804         case EBML_BIN:   av_freep(&((EbmlBin *)data_off)->data);  break;
 805         case EBML_NEST:
 806             if (syntax[i].list_elem_size) {
 807                 EbmlList *list = data_off;
 808                 char *ptr = list->elem;
 809                 for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
 810                     ebml_free(syntax[i].def.n, ptr);
 811                 av_free(list->elem);
 812             } else
 813                 ebml_free(syntax[i].def.n, data_off);
 814         default:  break;
 815         }
 816     }
 817 }
 818
 819
 820 /*
 821  * Autodetecting...
 822  */
 823 static int matroska_probe(AVProbeData *p)
 824 {
 825     uint64_t total = 0;
 826     int len_mask = 0x80, size = 1, n = 1;
 827     static const char probe_data[] = "matroska";
 828
 829     /* EBML header? */
 830     if (AV_RB32(p->buf) != EBML_ID_HEADER)
 831         return 0;
 832
 833     /* length of header */
 834     total = p->buf[4];
 835     while (size <= 8 && !(total & len_mask)) {
 836         size++;
 837         len_mask >>= 1;
 838     }
 839     if (size > 8)
 840       return 0;
 841     total &= (len_mask - 1);
 842     while (n < size)
 843         total = (total << 8) | p->buf[4 + n++];
 844
 845     /* Does the probe data contain the whole header? */
 846     if (p->buf_size < 4 + size + total)
 847       return 0;
 848
 849     /* The header must contain the document type 'matroska'. For now,
 850      * we don't parse the whole header but simply check for the
 851      * availability of that array of characters inside the header.
 852      * Not fully fool-proof, but good enough. */
 853     for (n = 4+size; n <= 4+size+total-(sizeof(probe_data)-1); n++)
 854         if (!memcmp(p->buf+n, probe_data, sizeof(probe_data)-1))
 855             return AVPROBE_SCORE_MAX;
 856
 857     return 0;
 858 }
 859
 860 static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
 861                                                  int num)
 862 {
 863     MatroskaTrack *tracks = matroska->tracks.elem;
 864     int i;
 865
 866     for (i=0; i < matroska->tracks.nb_elem; i++)
 867         if (tracks[i].num == num)
 868             return &tracks[i];
 869
 870     av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
 871     return NULL;
 872 }
 873
 874 static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
 875                                   MatroskaTrack *track)
 876 {
 877     MatroskaTrackEncoding *encodings = track->encodings.elem;
 878     uint8_t* data = *buf;
 879     int isize = *buf_size;
 880     uint8_t* pkt_data = NULL;
 881     int pkt_size = isize;
 882     int result = 0;
 883     int olen;
 884
 885     switch (encodings[0].compression.algo) {
 886     case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
 887         return encodings[0].compression.settings.size;
 888     case MATROSKA_TRACK_ENCODING_COMP_LZO:
 889         do {
 890             olen = pkt_size *= 3;
 891             pkt_data = av_realloc(pkt_data, pkt_size+AV_LZO_OUTPUT_PADDING);
 892             result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
 893         } while (result==AV_LZO_OUTPUT_FULL && pkt_size<10000000);
 894         if (result)
 895             goto failed;
 896         pkt_size -= olen;
 897         break;
 898 #if CONFIG_ZLIB
 899     case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
 900         z_stream zstream = {0};
 901         if (inflateInit(&zstream) != Z_OK)
 902             return -1;
 903         zstream.next_in = data;
 904         zstream.avail_in = isize;
 905         do {
 906             pkt_size *= 3;
 907             pkt_data = av_realloc(pkt_data, pkt_size);
 908             zstream.avail_out = pkt_size - zstream.total_out;
 909             zstream.next_out = pkt_data + zstream.total_out;
 910             result = inflate(&zstream, Z_NO_FLUSH);
 911         } while (result==Z_OK && pkt_size<10000000);
 912         pkt_size = zstream.total_out;
 913         inflateEnd(&zstream);
 914         if (result != Z_STREAM_END)
 915             goto failed;
 916         break;
 917     }
 918 #endif
 919 #if CONFIG_BZLIB
 920     case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
 921         bz_stream bzstream = {0};
 922         if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
 923             return -1;
 924         bzstream.next_in = data;
 925         bzstream.avail_in = isize;
 926         do {
 927             pkt_size *= 3;
 928             pkt_data = av_realloc(pkt_data, pkt_size);
 929             bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
 930             bzstream.next_out = pkt_data + bzstream.total_out_lo32;
 931             result = BZ2_bzDecompress(&bzstream);
 932         } while (result==BZ_OK && pkt_size<10000000);
 933         pkt_size = bzstream.total_out_lo32;
 934         BZ2_bzDecompressEnd(&bzstream);
 935         if (result != BZ_STREAM_END)
 936             goto failed;
 937         break;
 938     }
 939 #endif
 940     default:
 941         return -1;
 942     }
 943
 944     *buf = pkt_data;
 945     *buf_size = pkt_size;
 946     return 0;
 947  failed:
 948     av_free(pkt_data);
 949     return -1;
 950 }
 951
 952 static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
 953                                     AVPacket *pkt, uint64_t display_duration)
 954 {
 955     char *line, *layer, *ptr = pkt->data, *end = ptr+pkt->size;
 956     for (; *ptr!=',' && ptr<end-1; ptr++);
 957     if (*ptr == ',')
 958         layer = ++ptr;
 959     for (; *ptr!=',' && ptr<end-1; ptr++);
 960     if (*ptr == ',') {
 961         int64_t end_pts = pkt->pts + display_duration;
 962         int sc = matroska->time_scale * pkt->pts / 10000000;
 963         int ec = matroska->time_scale * end_pts  / 10000000;
 964         int sh, sm, ss, eh, em, es, len;
 965         sh = sc/360000;  sc -= 360000*sh;
 966         sm = sc/  6000;  sc -=   6000*sm;
 967         ss = sc/   100;  sc -=    100*ss;
 968         eh = ec/360000;  ec -= 360000*eh;
 969         em = ec/  6000;  ec -=   6000*em;
 970         es = ec/   100;  ec -=    100*es;
 971         *ptr++ = '\0';
 972         len = 50 + end-ptr + FF_INPUT_BUFFER_PADDING_SIZE;
 973         if (!(line = av_malloc(len)))
 974             return;
 975         snprintf(line,len,"Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
 976                  layer, sh, sm, ss, sc, eh, em, es, ec, ptr);
 977         av_free(pkt->data);
 978         pkt->data = line;
 979         pkt->size = strlen(line);
 980     }
 981 }
 982
 983 static void matroska_merge_packets(AVPacket *out, AVPacket *in)
 984 {
 985     out->data = av_realloc(out->data, out->size+in->size);
 986     memcpy(out->data+out->size, in->data, in->size);
 987     out->size += in->size;
 988     av_destruct_packet(in);
 989     av_free(in);
 990 }
 991
 992 static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
 993                                  AVMetadata **metadata, char *prefix)
 994 {
 995     MatroskaTag *tags = list->elem;
 996     char key[1024];
 997     int i;
 998
 999     for (i=0; i < list->nb_elem; i++) {
1000         const char *lang = strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1001         if (prefix)  snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1002         else         av_strlcpy(key, tags[i].name, sizeof(key));
1003         if (tags[i].def || !lang) {
1004         av_metadata_set2(metadata, key, tags[i].string, 0);
1005         if (tags[i].sub.nb_elem)
1006             matroska_convert_tag(s, &tags[i].sub, metadata, key);
1007         }
1008         if (lang) {
1009             av_strlcat(key, "-", sizeof(key));
1010             av_strlcat(key, lang, sizeof(key));
1011             av_metadata_set2(metadata, key, tags[i].string, 0);
1012             if (tags[i].sub.nb_elem)
1013                 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1014         }
1015     }
1016 }
1017
1018 static void matroska_convert_tags(AVFormatContext *s)
1019 {
1020     MatroskaDemuxContext *matroska = s->priv_data;
1021     MatroskaTags *tags = matroska->tags.elem;
1022     int i, j;
1023
1024     for (i=0; i < matroska->tags.nb_elem; i++) {
1025         if (tags[i].target.attachuid) {
1026             MatroskaAttachement *attachment = matroska->attachments.elem;
1027             for (j=0; j<matroska->attachments.nb_elem; j++)
1028                 if (attachment[j].uid == tags[i].target.attachuid)
1029                     matroska_convert_tag(s, &tags[i].tag,
1030                                          &attachment[j].stream->metadata, NULL);
1031         } else if (tags[i].target.chapteruid) {
1032             MatroskaChapter *chapter = matroska->chapters.elem;
1033             for (j=0; j<matroska->chapters.nb_elem; j++)
1034                 if (chapter[j].uid == tags[i].target.chapteruid)
1035                     matroska_convert_tag(s, &tags[i].tag,
1036                                          &chapter[j].chapter->metadata, NULL);
1037         } else if (tags[i].target.trackuid) {
1038             MatroskaTrack *track = matroska->tracks.elem;
1039             for (j=0; j<matroska->tracks.nb_elem; j++)
1040                 if (track[j].uid == tags[i].target.trackuid)
1041                     matroska_convert_tag(s, &tags[i].tag,
1042                                          &track[j].stream->metadata, NULL);
1043         } else {
1044             matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1045                                  tags[i].target.type);
1046         }
1047     }
1048 }
1049
1050 static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1051 {
1052     EbmlList *seekhead_list = &matroska->seekhead;
1053     MatroskaSeekhead *seekhead = seekhead_list->elem;
1054     uint32_t level_up = matroska->level_up;
1055     int64_t before_pos = url_ftell(matroska->ctx->pb);
1056     MatroskaLevel level;
1057     int i;
1058
1059     for (i=0; i<seekhead_list->nb_elem; i++) {
1060         int64_t offset = seekhead[i].pos + matroska->segment_start;
1061
1062         if (seekhead[i].pos <= before_pos
1063             || seekhead[i].id == MATROSKA_ID_SEEKHEAD
1064             || seekhead[i].id == MATROSKA_ID_CLUSTER)
1065             continue;
1066
1067         /* seek */
1068         if (url_fseek(matroska->ctx->pb, offset, SEEK_SET) != offset)
1069             continue;
1070
1071         /* We don't want to lose our seekhead level, so we add
1072          * a dummy. This is a crude hack. */
1073         if (matroska->num_levels == EBML_MAX_DEPTH) {
1074             av_log(matroska->ctx, AV_LOG_INFO,
1075                    "Max EBML element depth (%d) reached, "
1076                    "cannot parse further.\n", EBML_MAX_DEPTH);
1077             break;
1078         }
1079
1080         level.start = 0;
1081         level.length = (uint64_t)-1;
1082         matroska->levels[matroska->num_levels] = level;
1083         matroska->num_levels++;
1084
1085         ebml_parse(matroska, matroska_segment, matroska);
1086
1087         /* remove dummy level */
1088         while (matroska->num_levels) {
1089             uint64_t length = matroska->levels[--matroska->num_levels].length;
1090             if (length == (uint64_t)-1)
1091                 break;
1092         }
1093     }
1094
1095     /* seek back */
1096     url_fseek(matroska->ctx->pb, before_pos, SEEK_SET);
1097     matroska->level_up = level_up;
1098 }
1099
1100 static int matroska_aac_profile(char *codec_id)
1101 {
1102     static const char * const aac_profiles[] = { "MAIN", "LC", "SSR" };
1103     int profile;
1104
1105     for (profile=0; profile<FF_ARRAY_ELEMS(aac_profiles); profile++)
1106         if (strstr(codec_id, aac_profiles[profile]))
1107             break;
1108     return profile + 1;
1109 }
1110
1111 static int matroska_aac_sri(int samplerate)
1112 {
1113     int sri;
1114
1115     for (sri=0; sri<FF_ARRAY_ELEMS(ff_mpeg4audio_sample_rates); sri++)
1116         if (ff_mpeg4audio_sample_rates[sri] == samplerate)
1117             break;
1118     return sri;
1119 }
1120
1121 static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
1122 {
1123     MatroskaDemuxContext *matroska = s->priv_data;
1124     EbmlList *attachements_list = &matroska->attachments;
1125     MatroskaAttachement *attachements;
1126     EbmlList *chapters_list = &matroska->chapters;
1127     MatroskaChapter *chapters;
1128     MatroskaTrack *tracks;
1129     EbmlList *index_list;
1130     MatroskaIndex *index;
1131     int index_scale = 1;
1132     uint64_t max_start = 0;
1133     Ebml ebml = { 0 };
1134     AVStream *st;
1135     int i, j;
1136
1137     matroska->ctx = s;
1138
1139     /* First read the EBML header. */
1140     if (ebml_parse(matroska, ebml_syntax, &ebml)
1141         || ebml.version > EBML_VERSION       || ebml.max_size > sizeof(uint64_t)
1142         || ebml.id_length > sizeof(uint32_t) || strcmp(ebml.doctype, "matroska")
1143         || ebml.doctype_version > 2) {
1144         av_log(matroska->ctx, AV_LOG_ERROR,
1145                "EBML header using unsupported features\n"
1146                "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
1147                ebml.version, ebml.doctype, ebml.doctype_version);
1148         return AVERROR_PATCHWELCOME;
1149     }
1150     ebml_free(ebml_syntax, &ebml);
1151
1152     /* The next thing is a segment. */
1153     if (ebml_parse(matroska, matroska_segments, matroska) < 0)
1154         return -1;
1155     matroska_execute_seekhead(matroska);
1156
1157     if (matroska->duration)
1158         matroska->ctx->duration = matroska->duration * matroska->time_scale
1159                                   * 1000 / AV_TIME_BASE;
1160     av_metadata_set2(&s->metadata, "title", matroska->title, 0);
1161
1162     tracks = matroska->tracks.elem;
1163     for (i=0; i < matroska->tracks.nb_elem; i++) {
1164         MatroskaTrack *track = &tracks[i];
1165         enum CodecID codec_id = CODEC_ID_NONE;
1166         EbmlList *encodings_list = &tracks->encodings;
1167         MatroskaTrackEncoding *encodings = encodings_list->elem;
1168         uint8_t *extradata = NULL;
1169         int extradata_size = 0;
1170         int extradata_offset = 0;
1171         ByteIOContext b;
1172
1173         /* Apply some sanity checks. */
1174         if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1175             track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1176             track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1177             av_log(matroska->ctx, AV_LOG_INFO,
1178                    "Unknown or unsupported track type %"PRIu64"\n",
1179                    track->type);
1180             continue;
1181         }
1182         if (track->codec_id == NULL)
1183             continue;
1184
1185         if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1186             if (!track->default_duration)
1187                 track->default_duration = 1000000000/track->video.frame_rate;
1188             if (!track->video.display_width)
1189                 track->video.display_width = track->video.pixel_width;
1190             if (!track->video.display_height)
1191                 track->video.display_height = track->video.pixel_height;
1192         } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1193             if (!track->audio.out_samplerate)
1194                 track->audio.out_samplerate = track->audio.samplerate;
1195         }
1196         if (encodings_list->nb_elem > 1) {
1197             av_log(matroska->ctx, AV_LOG_ERROR,
1198                    "Multiple combined encodings no supported");
1199         } else if (encodings_list->nb_elem == 1) {
1200             if (encodings[0].type ||
1201                 (encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
1202 #if CONFIG_ZLIB
1203                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1204 #endif
1205 #if CONFIG_BZLIB
1206                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1207 #endif
1208                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
1209                 encodings[0].scope = 0;
1210                 av_log(matroska->ctx, AV_LOG_ERROR,
1211                        "Unsupported encoding type");
1212             } else if (track->codec_priv.size && encodings[0].scope&2) {
1213                 uint8_t *codec_priv = track->codec_priv.data;
1214                 int offset = matroska_decode_buffer(&track->codec_priv.data,
1215                                                     &track->codec_priv.size,
1216                                                     track);
1217                 if (offset < 0) {
1218                     track->codec_priv.data = NULL;
1219                     track->codec_priv.size = 0;
1220                     av_log(matroska->ctx, AV_LOG_ERROR,
1221                            "Failed to decode codec private data\n");
1222                 } else if (offset > 0) {
1223                     track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
1224                     memcpy(track->codec_priv.data,
1225                            encodings[0].compression.settings.data, offset);
1226                     memcpy(track->codec_priv.data+offset, codec_priv,
1227                            track->codec_priv.size);
1228                     track->codec_priv.size += offset;
1229                 }
1230                 if (codec_priv != track->codec_priv.data)
1231                     av_free(codec_priv);
1232             }
1233         }
1234
1235         for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
1236             if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1237                         strlen(ff_mkv_codec_tags[j].str))){
1238                 codec_id= ff_mkv_codec_tags[j].id;
1239                 break;
1240             }
1241         }
1242
1243         st = track->stream = av_new_stream(s, 0);
1244         if (st == NULL)
1245             return AVERROR(ENOMEM);
1246
1247         if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")
1248             && track->codec_priv.size >= 40
1249             && track->codec_priv.data != NULL) {
1250             track->ms_compat = 1;
1251             track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
1252             codec_id = ff_codec_get_id(ff_codec_bmp_tags, track->video.fourcc);
1253             extradata_offset = 40;
1254         } else if (!strcmp(track->codec_id, "A_MS/ACM")
1255                    && track->codec_priv.size >= 14
1256                    && track->codec_priv.data != NULL) {
1257             init_put_byte(&b, track->codec_priv.data, track->codec_priv.size,
1258                           URL_RDONLY, NULL, NULL, NULL, NULL);
1259             ff_get_wav_header(&b, st->codec, track->codec_priv.size);
1260             codec_id = st->codec->codec_id;
1261             extradata_offset = FFMIN(track->codec_priv.size, 18);
1262         } else if (!strcmp(track->codec_id, "V_QUICKTIME")
1263                    && (track->codec_priv.size >= 86)
1264                    && (track->codec_priv.data != NULL)) {
1265             track->video.fourcc = AV_RL32(track->codec_priv.data);
1266             codec_id=ff_codec_get_id(codec_movvideo_tags, track->video.fourcc);
1267         } else if (codec_id == CODEC_ID_PCM_S16BE) {
1268             switch (track->audio.bitdepth) {
1269             case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1270             case 24:  codec_id = CODEC_ID_PCM_S24BE;  break;
1271             case 32:  codec_id = CODEC_ID_PCM_S32BE;  break;
1272             }
1273         } else if (codec_id == CODEC_ID_PCM_S16LE) {
1274             switch (track->audio.bitdepth) {
1275             case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1276             case 24:  codec_id = CODEC_ID_PCM_S24LE;  break;
1277             case 32:  codec_id = CODEC_ID_PCM_S32LE;  break;
1278             }
1279         } else if (codec_id==CODEC_ID_PCM_F32LE && track->audio.bitdepth==64) {
1280             codec_id = CODEC_ID_PCM_F64LE;
1281         } else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
1282             int profile = matroska_aac_profile(track->codec_id);
1283             int sri = matroska_aac_sri(track->audio.samplerate);
1284             extradata = av_malloc(5);
1285             if (extradata == NULL)
1286                 return AVERROR(ENOMEM);
1287             extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
1288             extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
1289             if (strstr(track->codec_id, "SBR")) {
1290                 sri = matroska_aac_sri(track->audio.out_samplerate);
1291                 extradata[2] = 0x56;
1292                 extradata[3] = 0xE5;
1293                 extradata[4] = 0x80 | (sri<<3);
1294                 extradata_size = 5;
1295             } else
1296                 extradata_size = 2;
1297         } else if (codec_id == CODEC_ID_TTA) {
1298             extradata_size = 30;
1299             extradata = av_mallocz(extradata_size);
1300             if (extradata == NULL)
1301                 return AVERROR(ENOMEM);
1302             init_put_byte(&b, extradata, extradata_size, 1,
1303                           NULL, NULL, NULL, NULL);
1304             put_buffer(&b, "TTA1", 4);
1305             put_le16(&b, 1);
1306             put_le16(&b, track->audio.channels);
1307             put_le16(&b, track->audio.bitdepth);
1308             put_le32(&b, track->audio.out_samplerate);
1309             put_le32(&b, matroska->ctx->duration * track->audio.out_samplerate);
1310         } else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
1311                    codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
1312             extradata_offset = 26;
1313         } else if (codec_id == CODEC_ID_RA_144) {
1314             track->audio.out_samplerate = 8000;
1315             track->audio.channels = 1;
1316         } else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
1317                    codec_id == CODEC_ID_ATRAC3 || codec_id == CODEC_ID_SIPR) {
1318             int flavor;
1319             init_put_byte(&b, track->codec_priv.data,track->codec_priv.size,
1320                           0, NULL, NULL, NULL, NULL);
1321             url_fskip(&b, 22);
1322             flavor                       = get_be16(&b);
1323             track->audio.coded_framesize = get_be32(&b);
1324             url_fskip(&b, 12);
1325             track->audio.sub_packet_h    = get_be16(&b);
1326             track->audio.frame_size      = get_be16(&b);
1327             track->audio.sub_packet_size = get_be16(&b);
1328             track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
1329             if (codec_id == CODEC_ID_RA_288) {
1330                 st->codec->block_align = track->audio.coded_framesize;
1331                 track->codec_priv.size = 0;
1332             } else {
1333                 if (codec_id == CODEC_ID_SIPR && flavor < 4) {
1334                     const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
1335                     track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
1336                     st->codec->bit_rate = sipr_bit_rate[flavor];
1337                 }
1338                 st->codec->block_align = track->audio.sub_packet_size;
1339                 extradata_offset = 78;
1340             }
1341         }
1342         track->codec_priv.size -= extradata_offset;
1343
1344         if (codec_id == CODEC_ID_NONE)
1345             av_log(matroska->ctx, AV_LOG_INFO,
1346                    "Unknown/unsupported CodecID %s.\n", track->codec_id);
1347
1348         if (track->time_scale < 0.01)
1349             track->time_scale = 1.0;
1350         av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
1351
1352         st->codec->codec_id = codec_id;
1353         st->start_time = 0;
1354         if (strcmp(track->language, "und"))
1355             av_metadata_set2(&st->metadata, "language", track->language, 0);
1356         av_metadata_set2(&st->metadata, "title", track->name, 0);
1357
1358         if (track->flag_default)
1359             st->disposition |= AV_DISPOSITION_DEFAULT;
1360
1361         if (track->default_duration)
1362             av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
1363                       track->default_duration, 1000000000, 30000);
1364
1365         if (!st->codec->extradata) {
1366             if(extradata){
1367                 st->codec->extradata = extradata;
1368                 st->codec->extradata_size = extradata_size;
1369             } else if(track->codec_priv.data && track->codec_priv.size > 0){
1370                 st->codec->extradata = av_mallocz(track->codec_priv.size +
1371                                                   FF_INPUT_BUFFER_PADDING_SIZE);
1372                 if(st->codec->extradata == NULL)
1373                     return AVERROR(ENOMEM);
1374                 st->codec->extradata_size = track->codec_priv.size;
1375                 memcpy(st->codec->extradata,
1376                        track->codec_priv.data + extradata_offset,
1377                        track->codec_priv.size);
1378             }
1379         }
1380
1381         if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1382             st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1383             st->codec->codec_tag  = track->video.fourcc;
1384             st->codec->width  = track->video.pixel_width;
1385             st->codec->height = track->video.pixel_height;
1386             av_reduce(&st->sample_aspect_ratio.num,
1387                       &st->sample_aspect_ratio.den,
1388                       st->codec->height * track->video.display_width,
1389                       st->codec-> width * track->video.display_height,
1390                       255);
1391             if (st->codec->codec_id != CODEC_ID_H264)
1392             st->need_parsing = AVSTREAM_PARSE_HEADERS;
1393             if (track->default_duration)
1394                 st->avg_frame_rate = av_d2q(1000000000.0/track->default_duration, INT_MAX);
1395         } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1396             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1397             st->codec->sample_rate = track->audio.out_samplerate;
1398             st->codec->channels = track->audio.channels;
1399             if (st->codec->codec_id != CODEC_ID_AAC)
1400             st->need_parsing = AVSTREAM_PARSE_HEADERS;
1401         } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1402             st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1403         }
1404     }
1405
1406     attachements = attachements_list->elem;
1407     for (j=0; j<attachements_list->nb_elem; j++) {
1408         if (!(attachements[j].filename && attachements[j].mime &&
1409               attachements[j].bin.data && attachements[j].bin.size > 0)) {
1410             av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
1411         } else {
1412             AVStream *st = av_new_stream(s, 0);
1413             if (st == NULL)
1414                 break;
1415             av_metadata_set2(&st->metadata, "filename",attachements[j].filename, 0);
1416             st->codec->codec_id = CODEC_ID_NONE;
1417             st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
1418             st->codec->extradata  = av_malloc(attachements[j].bin.size);
1419             if(st->codec->extradata == NULL)
1420                 break;
1421             st->codec->extradata_size = attachements[j].bin.size;
1422             memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
1423
1424             for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
1425                 if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
1426                              strlen(ff_mkv_mime_tags[i].str))) {
1427                     st->codec->codec_id = ff_mkv_mime_tags[i].id;
1428                     break;
1429                 }
1430             }
1431             attachements[j].stream = st;
1432         }
1433     }
1434
1435     chapters = chapters_list->elem;
1436     for (i=0; i<chapters_list->nb_elem; i++)
1437         if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid
1438             && (max_start==0 || chapters[i].start > max_start)) {
1439             chapters[i].chapter =
1440             ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
1441                            chapters[i].start, chapters[i].end,
1442                            chapters[i].title);
1443             av_metadata_set2(&chapters[i].chapter->metadata,
1444                              "title", chapters[i].title, 0);
1445             max_start = chapters[i].start;
1446         }
1447
1448     index_list = &matroska->index;
1449     index = index_list->elem;
1450     if (index_list->nb_elem
1451         && index[0].time > 100000000000000/matroska->time_scale) {
1452         av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
1453         index_scale = matroska->time_scale;
1454     }
1455     for (i=0; i<index_list->nb_elem; i++) {
1456         EbmlList *pos_list = &index[i].pos;
1457         MatroskaIndexPos *pos = pos_list->elem;
1458         for (j=0; j<pos_list->nb_elem; j++) {
1459             MatroskaTrack *track = matroska_find_track_by_num(matroska,
1460                                                               pos[j].track);
1461             if (track && track->stream)
1462                 av_add_index_entry(track->stream,
1463                                    pos[j].pos + matroska->segment_start,
1464                                    index[i].time/index_scale, 0, 0,
1465                                    AVINDEX_KEYFRAME);
1466         }
1467     }
1468
1469     matroska_convert_tags(s);
1470
1471     return 0;
1472 }
1473
1474 /*
1475  * Put one packet in an application-supplied AVPacket struct.
1476  * Returns 0 on success or -1 on failure.
1477  */
1478 static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
1479                                    AVPacket *pkt)
1480 {
1481     if (matroska->num_packets > 0) {
1482         memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
1483         av_free(matroska->packets[0]);
1484         if (matroska->num_packets > 1) {
1485             memmove(&matroska->packets[0], &matroska->packets[1],
1486                     (matroska->num_packets - 1) * sizeof(AVPacket *));
1487             matroska->packets =
1488                 av_realloc(matroska->packets, (matroska->num_packets - 1) *
1489                            sizeof(AVPacket *));
1490         } else {
1491             av_freep(&matroska->packets);
1492         }
1493         matroska->num_packets--;
1494         return 0;
1495     }
1496
1497     return -1;
1498 }
1499
1500 /*
1501  * Free all packets in our internal queue.
1502  */
1503 static void matroska_clear_queue(MatroskaDemuxContext *matroska)
1504 {
1505     if (matroska->packets) {
1506         int n;
1507         for (n = 0; n < matroska->num_packets; n++) {
1508             av_free_packet(matroska->packets[n]);
1509             av_free(matroska->packets[n]);
1510         }
1511         av_freep(&matroska->packets);
1512         matroska->num_packets = 0;
1513     }
1514 }
1515
1516 static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
1517                                 int size, int64_t pos, uint64_t cluster_time,
1518                                 uint64_t duration, int is_keyframe,
1519                                 int64_t cluster_pos)
1520 {
1521     uint64_t timecode = AV_NOPTS_VALUE;
1522     MatroskaTrack *track;
1523     int res = 0;
1524     AVStream *st;
1525     AVPacket *pkt;
1526     int16_t block_time;
1527     uint32_t *lace_size = NULL;
1528     int n, flags, laces = 0;
1529     uint64_t num;
1530
1531     if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
1532         av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
1533         return res;
1534     }
1535     data += n;
1536     size -= n;
1537
1538     track = matroska_find_track_by_num(matroska, num);
1539     if (size <= 3 || !track || !track->stream) {
1540         av_log(matroska->ctx, AV_LOG_INFO,
1541                "Invalid stream %"PRIu64" or size %u\n", num, size);
1542         return res;
1543     }
1544     st = track->stream;
1545     if (st->discard >= AVDISCARD_ALL)
1546         return res;
1547     if (duration == AV_NOPTS_VALUE)
1548         duration = track->default_duration / matroska->time_scale;
1549
1550     block_time = AV_RB16(data);
1551     data += 2;
1552     flags = *data++;
1553     size -= 3;
1554     if (is_keyframe == -1)
1555         is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
1556
1557     if (cluster_time != (uint64_t)-1
1558         && (block_time >= 0 || cluster_time >= -block_time)) {
1559         timecode = cluster_time + block_time;
1560         if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE
1561             && timecode < track->end_timecode)
1562             is_keyframe = 0;  /* overlapping subtitles are not key frame */
1563         if (is_keyframe)
1564             av_add_index_entry(st, cluster_pos, timecode, 0,0,AVINDEX_KEYFRAME);
1565         track->end_timecode = FFMAX(track->end_timecode, timecode+duration);
1566     }
1567
1568     if (matroska->skip_to_keyframe && track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1569         if (!is_keyframe || timecode < matroska->skip_to_timecode)
1570             return res;
1571         matroska->skip_to_keyframe = 0;
1572     }
1573
1574     switch ((flags & 0x06) >> 1) {
1575         case 0x0: /* no lacing */
1576             laces = 1;
1577             lace_size = av_mallocz(sizeof(int));
1578             lace_size[0] = size;
1579             break;
1580
1581         case 0x1: /* Xiph lacing */
1582         case 0x2: /* fixed-size lacing */
1583         case 0x3: /* EBML lacing */
1584             assert(size>0); // size <=3 is checked before size-=3 above
1585             laces = (*data) + 1;
1586             data += 1;
1587             size -= 1;
1588             lace_size = av_mallocz(laces * sizeof(int));
1589
1590             switch ((flags & 0x06) >> 1) {
1591                 case 0x1: /* Xiph lacing */ {
1592                     uint8_t temp;
1593                     uint32_t total = 0;
1594                     for (n = 0; res == 0 && n < laces - 1; n++) {
1595                         while (1) {
1596                             if (size == 0) {
1597                                 res = -1;
1598                                 break;
1599                             }
1600                             temp = *data;
1601                             lace_size[n] += temp;
1602                             data += 1;
1603                             size -= 1;
1604                             if (temp != 0xff)
1605                                 break;
1606                         }
1607                         total += lace_size[n];
1608                     }
1609                     lace_size[n] = size - total;
1610                     break;
1611                 }
1612
1613                 case 0x2: /* fixed-size lacing */
1614                     for (n = 0; n < laces; n++)
1615                         lace_size[n] = size / laces;
1616                     break;
1617
1618                 case 0x3: /* EBML lacing */ {
1619                     uint32_t total;
1620                     n = matroska_ebmlnum_uint(matroska, data, size, &num);
1621                     if (n < 0) {
1622                         av_log(matroska->ctx, AV_LOG_INFO,
1623                                "EBML block data error\n");
1624                         break;
1625                     }
1626                     data += n;
1627                     size -= n;
1628                     total = lace_size[0] = num;
1629                     for (n = 1; res == 0 && n < laces - 1; n++) {
1630                         int64_t snum;
1631                         int r;
1632                         r = matroska_ebmlnum_sint(matroska, data, size, &snum);
1633                         if (r < 0) {
1634                             av_log(matroska->ctx, AV_LOG_INFO,
1635                                    "EBML block data error\n");
1636                             break;
1637                         }
1638                         data += r;
1639                         size -= r;
1640                         lace_size[n] = lace_size[n - 1] + snum;
1641                         total += lace_size[n];
1642                     }
1643                     lace_size[n] = size - total;
1644                     break;
1645                 }
1646             }
1647             break;
1648     }
1649
1650     if (res == 0) {
1651         for (n = 0; n < laces; n++) {
1652             if ((st->codec->codec_id == CODEC_ID_RA_288 ||
1653                  st->codec->codec_id == CODEC_ID_COOK ||
1654                  st->codec->codec_id == CODEC_ID_SIPR ||
1655                  st->codec->codec_id == CODEC_ID_ATRAC3) &&
1656                  st->codec->block_align && track->audio.sub_packet_size) {
1657                 int a = st->codec->block_align;
1658                 int sps = track->audio.sub_packet_size;
1659                 int cfs = track->audio.coded_framesize;
1660                 int h = track->audio.sub_packet_h;
1661                 int y = track->audio.sub_packet_cnt;
1662                 int w = track->audio.frame_size;
1663                 int x;
1664
1665                 if (!track->audio.pkt_cnt) {
1666                     if (st->codec->codec_id == CODEC_ID_RA_288)
1667                         for (x=0; x<h/2; x++)
1668                             memcpy(track->audio.buf+x*2*w+y*cfs,
1669                                    data+x*cfs, cfs);
1670                     else if (st->codec->codec_id == CODEC_ID_SIPR)
1671                         memcpy(track->audio.buf + y*w, data, w);
1672                     else
1673                         for (x=0; x<w/sps; x++)
1674                             memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
1675
1676                     if (++track->audio.sub_packet_cnt >= h) {
1677                         if (st->codec->codec_id == CODEC_ID_SIPR)
1678                             ff_rm_reorder_sipr_data(track->audio.buf, h, w);
1679                         track->audio.sub_packet_cnt = 0;
1680                         track->audio.pkt_cnt = h*w / a;
1681                     }
1682                 }
1683                 while (track->audio.pkt_cnt) {
1684                     pkt = av_mallocz(sizeof(AVPacket));
1685                     av_new_packet(pkt, a);
1686                     memcpy(pkt->data, track->audio.buf
1687                            + a * (h*w / a - track->audio.pkt_cnt--), a);
1688                     pkt->pos = pos;
1689                     pkt->stream_index = st->index;
1690                     dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1691                 }
1692             } else {
1693                 MatroskaTrackEncoding *encodings = track->encodings.elem;
1694                 int offset = 0, pkt_size = lace_size[n];
1695                 uint8_t *pkt_data = data;
1696
1697                 if (lace_size[n] > size) {
1698                     av_log(matroska->ctx, AV_LOG_ERROR, "Invalid packet size\n");
1699                     break;
1700                 }
1701
1702                 if (encodings && encodings->scope & 1) {
1703                     offset = matroska_decode_buffer(&pkt_data,&pkt_size, track);
1704                     if (offset < 0)
1705                         continue;
1706                 }
1707
1708                 pkt = av_mallocz(sizeof(AVPacket));
1709                 /* XXX: prevent data copy... */
1710                 if (av_new_packet(pkt, pkt_size+offset) < 0) {
1711                     av_free(pkt);
1712                     res = AVERROR(ENOMEM);
1713                     break;
1714                 }
1715                 if (offset)
1716                     memcpy (pkt->data, encodings->compression.settings.data, offset);
1717                 memcpy (pkt->data+offset, pkt_data, pkt_size);
1718
1719                 if (pkt_data != data)
1720                     av_free(pkt_data);
1721
1722                 if (n == 0)
1723                     pkt->flags = is_keyframe;
1724                 pkt->stream_index = st->index;
1725
1726                 if (track->ms_compat)
1727                     pkt->dts = timecode;
1728                 else
1729                     pkt->pts = timecode;
1730                 pkt->pos = pos;
1731                 if (st->codec->codec_id == CODEC_ID_TEXT)
1732                     pkt->convergence_duration = duration;
1733                 else if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE)
1734                     pkt->duration = duration;
1735
1736                 if (st->codec->codec_id == CODEC_ID_SSA)
1737                     matroska_fix_ass_packet(matroska, pkt, duration);
1738
1739                 if (matroska->prev_pkt &&
1740                     timecode != AV_NOPTS_VALUE &&
1741                     matroska->prev_pkt->pts == timecode &&
1742                     matroska->prev_pkt->stream_index == st->index)
1743                     matroska_merge_packets(matroska->prev_pkt, pkt);
1744                 else {
1745                     dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1746                     matroska->prev_pkt = pkt;
1747                 }
1748             }
1749
1750             if (timecode != AV_NOPTS_VALUE)
1751                 timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
1752             data += lace_size[n];
1753             size -= lace_size[n];
1754         }
1755     }
1756
1757     av_free(lace_size);
1758     return res;
1759 }
1760
1761 static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
1762 {
1763     MatroskaCluster cluster = { 0 };
1764     EbmlList *blocks_list;
1765     MatroskaBlock *blocks;
1766     int i, res;
1767     int64_t pos = url_ftell(matroska->ctx->pb);
1768     matroska->prev_pkt = NULL;
1769     if (matroska->has_cluster_id){
1770         /* For the first cluster we parse, its ID was already read as
1771            part of matroska_read_header(), so don't read it again */
1772         res = ebml_parse_id(matroska, matroska_clusters,
1773                             MATROSKA_ID_CLUSTER, &cluster);
1774         pos -= 4;  /* sizeof the ID which was already read */
1775         matroska->has_cluster_id = 0;
1776     } else
1777         res = ebml_parse(matroska, matroska_clusters, &cluster);
1778     blocks_list = &cluster.blocks;
1779     blocks = blocks_list->elem;
1780     for (i=0; i<blocks_list->nb_elem; i++)
1781         if (blocks[i].bin.size > 0) {
1782             int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
1783             res=matroska_parse_block(matroska,
1784                                      blocks[i].bin.data, blocks[i].bin.size,
1785                                      blocks[i].bin.pos,  cluster.timecode,
1786                                      blocks[i].duration, is_keyframe,
1787                                      pos);
1788         }
1789     ebml_free(matroska_cluster, &cluster);
1790     if (res < 0)  matroska->done = 1;
1791     return res;
1792 }
1793
1794 static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
1795 {
1796     MatroskaDemuxContext *matroska = s->priv_data;
1797
1798     while (matroska_deliver_packet(matroska, pkt)) {
1799         if (matroska->done)
1800             return AVERROR_EOF;
1801         matroska_parse_cluster(matroska);
1802     }
1803
1804     return 0;
1805 }
1806
1807 static int matroska_read_seek(AVFormatContext *s, int stream_index,
1808                               int64_t timestamp, int flags)
1809 {
1810     MatroskaDemuxContext *matroska = s->priv_data;
1811     MatroskaTrack *tracks = matroska->tracks.elem;
1812     AVStream *st = s->streams[stream_index];
1813     int i, index, index_sub, index_min;
1814
1815     if (!st->nb_index_entries)
1816         return 0;
1817     timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
1818
1819     if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1820         url_fseek(s->pb, st->index_entries[st->nb_index_entries-1].pos, SEEK_SET);
1821         while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1822             matroska_clear_queue(matroska);
1823             if (matroska_parse_cluster(matroska) < 0)
1824                 break;
1825         }
1826     }
1827
1828     matroska_clear_queue(matroska);
1829     if (index < 0)
1830         return 0;
1831
1832     index_min = index;
1833     for (i=0; i < matroska->tracks.nb_elem; i++) {
1834         tracks[i].end_timecode = 0;
1835         if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE
1836             && !tracks[i].stream->discard != AVDISCARD_ALL) {
1837             index_sub = av_index_search_timestamp(tracks[i].stream, st->index_entries[index].timestamp, AVSEEK_FLAG_BACKWARD);
1838             if (index_sub >= 0
1839                 && st->index_entries[index_sub].pos < st->index_entries[index_min].pos
1840                 && st->index_entries[index].timestamp - st->index_entries[index_sub].timestamp < 30000000000/matroska->time_scale)
1841                 index_min = index_sub;
1842         }
1843     }
1844
1845     url_fseek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
1846     matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
1847     matroska->skip_to_timecode = st->index_entries[index].timestamp;
1848     matroska->done = 0;
1849     av_update_cur_dts(s, st, st->index_entries[index].timestamp);
1850     return 0;
1851 }
1852
1853 static int matroska_read_close(AVFormatContext *s)
1854 {
1855     MatroskaDemuxContext *matroska = s->priv_data;
1856     MatroskaTrack *tracks = matroska->tracks.elem;
1857     int n;
1858
1859     matroska_clear_queue(matroska);
1860
1861     for (n=0; n < matroska->tracks.nb_elem; n++)
1862         if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
1863             av_free(tracks[n].audio.buf);
1864     ebml_free(matroska_segment, matroska);
1865
1866     return 0;
1867 }
1868
1869 AVInputFormat matroska_demuxer = {
1870     "matroska",
1871     NULL_IF_CONFIG_SMALL("Matroska file format"),
1872     sizeof(MatroskaDemuxContext),
1873     matroska_probe,
1874     matroska_read_header,
1875     matroska_read_packet,
1876     matroska_read_close,
1877     matroska_read_seek,
1878     .metadata_conv = ff_mkv_metadata_conv,
1879 };