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