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