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