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libavformat/matroskadec.c

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00001 /*
00002  * Matroska file demuxer
00003  * Copyright (c) 2003-2008 The FFmpeg Project
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00031 #include <stdio.h>
00032 #include "avformat.h"
00033 #include "internal.h"
00034 /* For ff_codec_get_id(). */
00035 #include "riff.h"
00036 #include "isom.h"
00037 #include "rm.h"
00038 #include "matroska.h"
00039 #include "libavcodec/mpeg4audio.h"
00040 #include "libavutil/intfloat_readwrite.h"
00041 #include "libavutil/intreadwrite.h"
00042 #include "libavutil/avstring.h"
00043 #include "libavutil/lzo.h"
00044 #if CONFIG_ZLIB
00045 #include <zlib.h>
00046 #endif
00047 #if CONFIG_BZLIB
00048 #include <bzlib.h>
00049 #endif
00050 
00051 typedef enum {
00052     EBML_NONE,
00053     EBML_UINT,
00054     EBML_FLOAT,
00055     EBML_STR,
00056     EBML_UTF8,
00057     EBML_BIN,
00058     EBML_NEST,
00059     EBML_PASS,
00060     EBML_STOP,
00061 } EbmlType;
00062 
00063 typedef const struct EbmlSyntax {
00064     uint32_t id;
00065     EbmlType type;
00066     int list_elem_size;
00067     int data_offset;
00068     union {
00069         uint64_t    u;
00070         double      f;
00071         const char *s;
00072         const struct EbmlSyntax *n;
00073     } def;
00074 } EbmlSyntax;
00075 
00076 typedef struct {
00077     int nb_elem;
00078     void *elem;
00079 } EbmlList;
00080 
00081 typedef struct {
00082     int      size;
00083     uint8_t *data;
00084     int64_t  pos;
00085 } EbmlBin;
00086 
00087 typedef struct {
00088     uint64_t version;
00089     uint64_t max_size;
00090     uint64_t id_length;
00091     char    *doctype;
00092     uint64_t doctype_version;
00093 } Ebml;
00094 
00095 typedef struct {
00096     uint64_t algo;
00097     EbmlBin  settings;
00098 } MatroskaTrackCompression;
00099 
00100 typedef struct {
00101     uint64_t scope;
00102     uint64_t type;
00103     MatroskaTrackCompression compression;
00104 } MatroskaTrackEncoding;
00105 
00106 typedef struct {
00107     double   frame_rate;
00108     uint64_t display_width;
00109     uint64_t display_height;
00110     uint64_t pixel_width;
00111     uint64_t pixel_height;
00112     uint64_t fourcc;
00113 } MatroskaTrackVideo;
00114 
00115 typedef struct {
00116     double   samplerate;
00117     double   out_samplerate;
00118     uint64_t bitdepth;
00119     uint64_t channels;
00120 
00121     /* real audio header (extracted from extradata) */
00122     int      coded_framesize;
00123     int      sub_packet_h;
00124     int      frame_size;
00125     int      sub_packet_size;
00126     int      sub_packet_cnt;
00127     int      pkt_cnt;
00128     uint8_t *buf;
00129 } MatroskaTrackAudio;
00130 
00131 typedef struct {
00132     uint64_t num;
00133     uint64_t uid;
00134     uint64_t type;
00135     char    *name;
00136     char    *codec_id;
00137     EbmlBin  codec_priv;
00138     char    *language;
00139     double time_scale;
00140     uint64_t default_duration;
00141     uint64_t flag_default;
00142     MatroskaTrackVideo video;
00143     MatroskaTrackAudio audio;
00144     EbmlList encodings;
00145 
00146     AVStream *stream;
00147     int64_t end_timecode;
00148     int ms_compat;
00149 } MatroskaTrack;
00150 
00151 typedef struct {
00152     uint64_t uid;
00153     char *filename;
00154     char *mime;
00155     EbmlBin bin;
00156 
00157     AVStream *stream;
00158 } MatroskaAttachement;
00159 
00160 typedef struct {
00161     uint64_t start;
00162     uint64_t end;
00163     uint64_t uid;
00164     char    *title;
00165 
00166     AVChapter *chapter;
00167 } MatroskaChapter;
00168 
00169 typedef struct {
00170     uint64_t track;
00171     uint64_t pos;
00172 } MatroskaIndexPos;
00173 
00174 typedef struct {
00175     uint64_t time;
00176     EbmlList pos;
00177 } MatroskaIndex;
00178 
00179 typedef struct {
00180     char *name;
00181     char *string;
00182     char *lang;
00183     uint64_t def;
00184     EbmlList sub;
00185 } MatroskaTag;
00186 
00187 typedef struct {
00188     char    *type;
00189     uint64_t typevalue;
00190     uint64_t trackuid;
00191     uint64_t chapteruid;
00192     uint64_t attachuid;
00193 } MatroskaTagTarget;
00194 
00195 typedef struct {
00196     MatroskaTagTarget target;
00197     EbmlList tag;
00198 } MatroskaTags;
00199 
00200 typedef struct {
00201     uint64_t id;
00202     uint64_t pos;
00203 } MatroskaSeekhead;
00204 
00205 typedef struct {
00206     uint64_t start;
00207     uint64_t length;
00208 } MatroskaLevel;
00209 
00210 typedef struct {
00211     AVFormatContext *ctx;
00212 
00213     /* EBML stuff */
00214     int num_levels;
00215     MatroskaLevel levels[EBML_MAX_DEPTH];
00216     int level_up;
00217 
00218     uint64_t time_scale;
00219     double   duration;
00220     char    *title;
00221     EbmlList tracks;
00222     EbmlList attachments;
00223     EbmlList chapters;
00224     EbmlList index;
00225     EbmlList tags;
00226     EbmlList seekhead;
00227 
00228     /* byte position of the segment inside the stream */
00229     int64_t segment_start;
00230 
00231     /* the packet queue */
00232     AVPacket **packets;
00233     int num_packets;
00234     AVPacket *prev_pkt;
00235 
00236     int done;
00237     int has_cluster_id;
00238 
00239     /* What to skip before effectively reading a packet. */
00240     int skip_to_keyframe;
00241     uint64_t skip_to_timecode;
00242 } MatroskaDemuxContext;
00243 
00244 typedef struct {
00245     uint64_t duration;
00246     int64_t  reference;
00247     uint64_t non_simple;
00248     EbmlBin  bin;
00249 } MatroskaBlock;
00250 
00251 typedef struct {
00252     uint64_t timecode;
00253     EbmlList blocks;
00254 } MatroskaCluster;
00255 
00256 static EbmlSyntax ebml_header[] = {
00257     { EBML_ID_EBMLREADVERSION,        EBML_UINT, 0, offsetof(Ebml,version), {.u=EBML_VERSION} },
00258     { EBML_ID_EBMLMAXSIZELENGTH,      EBML_UINT, 0, offsetof(Ebml,max_size), {.u=8} },
00259     { EBML_ID_EBMLMAXIDLENGTH,        EBML_UINT, 0, offsetof(Ebml,id_length), {.u=4} },
00260     { EBML_ID_DOCTYPE,                EBML_STR,  0, offsetof(Ebml,doctype), {.s="(none)"} },
00261     { EBML_ID_DOCTYPEREADVERSION,     EBML_UINT, 0, offsetof(Ebml,doctype_version), {.u=1} },
00262     { EBML_ID_EBMLVERSION,            EBML_NONE },
00263     { EBML_ID_DOCTYPEVERSION,         EBML_NONE },
00264     { 0 }
00265 };
00266 
00267 static EbmlSyntax ebml_syntax[] = {
00268     { EBML_ID_HEADER,                 EBML_NEST, 0, 0, {.n=ebml_header} },
00269     { 0 }
00270 };
00271 
00272 static EbmlSyntax matroska_info[] = {
00273     { MATROSKA_ID_TIMECODESCALE,      EBML_UINT,  0, offsetof(MatroskaDemuxContext,time_scale), {.u=1000000} },
00274     { MATROSKA_ID_DURATION,           EBML_FLOAT, 0, offsetof(MatroskaDemuxContext,duration) },
00275     { MATROSKA_ID_TITLE,              EBML_UTF8,  0, offsetof(MatroskaDemuxContext,title) },
00276     { MATROSKA_ID_WRITINGAPP,         EBML_NONE },
00277     { MATROSKA_ID_MUXINGAPP,          EBML_NONE },
00278     { MATROSKA_ID_DATEUTC,            EBML_NONE },
00279     { MATROSKA_ID_SEGMENTUID,         EBML_NONE },
00280     { 0 }
00281 };
00282 
00283 static EbmlSyntax matroska_track_video[] = {
00284     { MATROSKA_ID_VIDEOFRAMERATE,     EBML_FLOAT,0, offsetof(MatroskaTrackVideo,frame_rate) },
00285     { MATROSKA_ID_VIDEODISPLAYWIDTH,  EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_width) },
00286     { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_height) },
00287     { MATROSKA_ID_VIDEOPIXELWIDTH,    EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_width) },
00288     { MATROSKA_ID_VIDEOPIXELHEIGHT,   EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_height) },
00289     { MATROSKA_ID_VIDEOCOLORSPACE,    EBML_UINT, 0, offsetof(MatroskaTrackVideo,fourcc) },
00290     { MATROSKA_ID_VIDEOPIXELCROPB,    EBML_NONE },
00291     { MATROSKA_ID_VIDEOPIXELCROPT,    EBML_NONE },
00292     { MATROSKA_ID_VIDEOPIXELCROPL,    EBML_NONE },
00293     { MATROSKA_ID_VIDEOPIXELCROPR,    EBML_NONE },
00294     { MATROSKA_ID_VIDEODISPLAYUNIT,   EBML_NONE },
00295     { MATROSKA_ID_VIDEOFLAGINTERLACED,EBML_NONE },
00296     { MATROSKA_ID_VIDEOSTEREOMODE,    EBML_NONE },
00297     { MATROSKA_ID_VIDEOASPECTRATIO,   EBML_NONE },
00298     { 0 }
00299 };
00300 
00301 static EbmlSyntax matroska_track_audio[] = {
00302     { MATROSKA_ID_AUDIOSAMPLINGFREQ,  EBML_FLOAT,0, offsetof(MatroskaTrackAudio,samplerate), {.f=8000.0} },
00303     { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ,EBML_FLOAT,0,offsetof(MatroskaTrackAudio,out_samplerate) },
00304     { MATROSKA_ID_AUDIOBITDEPTH,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,bitdepth) },
00305     { MATROSKA_ID_AUDIOCHANNELS,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,channels), {.u=1} },
00306     { 0 }
00307 };
00308 
00309 static EbmlSyntax matroska_track_encoding_compression[] = {
00310     { MATROSKA_ID_ENCODINGCOMPALGO,   EBML_UINT, 0, offsetof(MatroskaTrackCompression,algo), {.u=0} },
00311     { MATROSKA_ID_ENCODINGCOMPSETTINGS,EBML_BIN, 0, offsetof(MatroskaTrackCompression,settings) },
00312     { 0 }
00313 };
00314 
00315 static EbmlSyntax matroska_track_encoding[] = {
00316     { MATROSKA_ID_ENCODINGSCOPE,      EBML_UINT, 0, offsetof(MatroskaTrackEncoding,scope), {.u=1} },
00317     { MATROSKA_ID_ENCODINGTYPE,       EBML_UINT, 0, offsetof(MatroskaTrackEncoding,type), {.u=0} },
00318     { MATROSKA_ID_ENCODINGCOMPRESSION,EBML_NEST, 0, offsetof(MatroskaTrackEncoding,compression), {.n=matroska_track_encoding_compression} },
00319     { MATROSKA_ID_ENCODINGORDER,      EBML_NONE },
00320     { 0 }
00321 };
00322 
00323 static EbmlSyntax matroska_track_encodings[] = {
00324     { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack,encodings), {.n=matroska_track_encoding} },
00325     { 0 }
00326 };
00327 
00328 static EbmlSyntax matroska_track[] = {
00329     { MATROSKA_ID_TRACKNUMBER,          EBML_UINT, 0, offsetof(MatroskaTrack,num) },
00330     { MATROSKA_ID_TRACKNAME,            EBML_UTF8, 0, offsetof(MatroskaTrack,name) },
00331     { MATROSKA_ID_TRACKUID,             EBML_UINT, 0, offsetof(MatroskaTrack,uid) },
00332     { MATROSKA_ID_TRACKTYPE,            EBML_UINT, 0, offsetof(MatroskaTrack,type) },
00333     { MATROSKA_ID_CODECID,              EBML_STR,  0, offsetof(MatroskaTrack,codec_id) },
00334     { MATROSKA_ID_CODECPRIVATE,         EBML_BIN,  0, offsetof(MatroskaTrack,codec_priv) },
00335     { MATROSKA_ID_TRACKLANGUAGE,        EBML_UTF8, 0, offsetof(MatroskaTrack,language), {.s="eng"} },
00336     { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack,default_duration) },
00337     { MATROSKA_ID_TRACKTIMECODESCALE,   EBML_FLOAT,0, offsetof(MatroskaTrack,time_scale), {.f=1.0} },
00338     { MATROSKA_ID_TRACKFLAGDEFAULT,     EBML_UINT, 0, offsetof(MatroskaTrack,flag_default), {.u=1} },
00339     { MATROSKA_ID_TRACKVIDEO,           EBML_NEST, 0, offsetof(MatroskaTrack,video), {.n=matroska_track_video} },
00340     { MATROSKA_ID_TRACKAUDIO,           EBML_NEST, 0, offsetof(MatroskaTrack,audio), {.n=matroska_track_audio} },
00341     { MATROSKA_ID_TRACKCONTENTENCODINGS,EBML_NEST, 0, 0, {.n=matroska_track_encodings} },
00342     { MATROSKA_ID_TRACKFLAGENABLED,     EBML_NONE },
00343     { MATROSKA_ID_TRACKFLAGFORCED,      EBML_NONE },
00344     { MATROSKA_ID_TRACKFLAGLACING,      EBML_NONE },
00345     { MATROSKA_ID_CODECNAME,            EBML_NONE },
00346     { MATROSKA_ID_CODECDECODEALL,       EBML_NONE },
00347     { MATROSKA_ID_CODECINFOURL,         EBML_NONE },
00348     { MATROSKA_ID_CODECDOWNLOADURL,     EBML_NONE },
00349     { MATROSKA_ID_TRACKMINCACHE,        EBML_NONE },
00350     { MATROSKA_ID_TRACKMAXCACHE,        EBML_NONE },
00351     { MATROSKA_ID_TRACKMAXBLKADDID,     EBML_NONE },
00352     { 0 }
00353 };
00354 
00355 static EbmlSyntax matroska_tracks[] = {
00356     { MATROSKA_ID_TRACKENTRY,         EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext,tracks), {.n=matroska_track} },
00357     { 0 }
00358 };
00359 
00360 static EbmlSyntax matroska_attachment[] = {
00361     { MATROSKA_ID_FILEUID,            EBML_UINT, 0, offsetof(MatroskaAttachement,uid) },
00362     { MATROSKA_ID_FILENAME,           EBML_UTF8, 0, offsetof(MatroskaAttachement,filename) },
00363     { MATROSKA_ID_FILEMIMETYPE,       EBML_STR,  0, offsetof(MatroskaAttachement,mime) },
00364     { MATROSKA_ID_FILEDATA,           EBML_BIN,  0, offsetof(MatroskaAttachement,bin) },
00365     { MATROSKA_ID_FILEDESC,           EBML_NONE },
00366     { 0 }
00367 };
00368 
00369 static EbmlSyntax matroska_attachments[] = {
00370     { MATROSKA_ID_ATTACHEDFILE,       EBML_NEST, sizeof(MatroskaAttachement), offsetof(MatroskaDemuxContext,attachments), {.n=matroska_attachment} },
00371     { 0 }
00372 };
00373 
00374 static EbmlSyntax matroska_chapter_display[] = {
00375     { MATROSKA_ID_CHAPSTRING,         EBML_UTF8, 0, offsetof(MatroskaChapter,title) },
00376     { MATROSKA_ID_CHAPLANG,           EBML_NONE },
00377     { 0 }
00378 };
00379 
00380 static EbmlSyntax matroska_chapter_entry[] = {
00381     { MATROSKA_ID_CHAPTERTIMESTART,   EBML_UINT, 0, offsetof(MatroskaChapter,start), {.u=AV_NOPTS_VALUE} },
00382     { MATROSKA_ID_CHAPTERTIMEEND,     EBML_UINT, 0, offsetof(MatroskaChapter,end), {.u=AV_NOPTS_VALUE} },
00383     { MATROSKA_ID_CHAPTERUID,         EBML_UINT, 0, offsetof(MatroskaChapter,uid) },
00384     { MATROSKA_ID_CHAPTERDISPLAY,     EBML_NEST, 0, 0, {.n=matroska_chapter_display} },
00385     { MATROSKA_ID_CHAPTERFLAGHIDDEN,  EBML_NONE },
00386     { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
00387     { MATROSKA_ID_CHAPTERPHYSEQUIV,   EBML_NONE },
00388     { MATROSKA_ID_CHAPTERATOM,        EBML_NONE },
00389     { 0 }
00390 };
00391 
00392 static EbmlSyntax matroska_chapter[] = {
00393     { MATROSKA_ID_CHAPTERATOM,        EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext,chapters), {.n=matroska_chapter_entry} },
00394     { MATROSKA_ID_EDITIONUID,         EBML_NONE },
00395     { MATROSKA_ID_EDITIONFLAGHIDDEN,  EBML_NONE },
00396     { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
00397     { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
00398     { 0 }
00399 };
00400 
00401 static EbmlSyntax matroska_chapters[] = {
00402     { MATROSKA_ID_EDITIONENTRY,       EBML_NEST, 0, 0, {.n=matroska_chapter} },
00403     { 0 }
00404 };
00405 
00406 static EbmlSyntax matroska_index_pos[] = {
00407     { MATROSKA_ID_CUETRACK,           EBML_UINT, 0, offsetof(MatroskaIndexPos,track) },
00408     { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos,pos)   },
00409     { MATROSKA_ID_CUEBLOCKNUMBER,     EBML_NONE },
00410     { 0 }
00411 };
00412 
00413 static EbmlSyntax matroska_index_entry[] = {
00414     { MATROSKA_ID_CUETIME,            EBML_UINT, 0, offsetof(MatroskaIndex,time) },
00415     { MATROSKA_ID_CUETRACKPOSITION,   EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex,pos), {.n=matroska_index_pos} },
00416     { 0 }
00417 };
00418 
00419 static EbmlSyntax matroska_index[] = {
00420     { MATROSKA_ID_POINTENTRY,         EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext,index), {.n=matroska_index_entry} },
00421     { 0 }
00422 };
00423 
00424 static EbmlSyntax matroska_simpletag[] = {
00425     { MATROSKA_ID_TAGNAME,            EBML_UTF8, 0, offsetof(MatroskaTag,name) },
00426     { MATROSKA_ID_TAGSTRING,          EBML_UTF8, 0, offsetof(MatroskaTag,string) },
00427     { MATROSKA_ID_TAGLANG,            EBML_STR,  0, offsetof(MatroskaTag,lang), {.s="und"} },
00428     { MATROSKA_ID_TAGDEFAULT,         EBML_UINT, 0, offsetof(MatroskaTag,def) },
00429     { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag,sub), {.n=matroska_simpletag} },
00430     { 0 }
00431 };
00432 
00433 static EbmlSyntax matroska_tagtargets[] = {
00434     { MATROSKA_ID_TAGTARGETS_TYPE,      EBML_STR,  0, offsetof(MatroskaTagTarget,type) },
00435     { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget,typevalue), {.u=50} },
00436     { MATROSKA_ID_TAGTARGETS_TRACKUID,  EBML_UINT, 0, offsetof(MatroskaTagTarget,trackuid) },
00437     { MATROSKA_ID_TAGTARGETS_CHAPTERUID,EBML_UINT, 0, offsetof(MatroskaTagTarget,chapteruid) },
00438     { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget,attachuid) },
00439     { 0 }
00440 };
00441 
00442 static EbmlSyntax matroska_tag[] = {
00443     { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags,tag), {.n=matroska_simpletag} },
00444     { MATROSKA_ID_TAGTARGETS,         EBML_NEST, 0, offsetof(MatroskaTags,target), {.n=matroska_tagtargets} },
00445     { 0 }
00446 };
00447 
00448 static EbmlSyntax matroska_tags[] = {
00449     { MATROSKA_ID_TAG,                EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext,tags), {.n=matroska_tag} },
00450     { 0 }
00451 };
00452 
00453 static EbmlSyntax matroska_seekhead_entry[] = {
00454     { MATROSKA_ID_SEEKID,             EBML_UINT, 0, offsetof(MatroskaSeekhead,id) },
00455     { MATROSKA_ID_SEEKPOSITION,       EBML_UINT, 0, offsetof(MatroskaSeekhead,pos), {.u=-1} },
00456     { 0 }
00457 };
00458 
00459 static EbmlSyntax matroska_seekhead[] = {
00460     { MATROSKA_ID_SEEKENTRY,          EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext,seekhead), {.n=matroska_seekhead_entry} },
00461     { 0 }
00462 };
00463 
00464 static EbmlSyntax matroska_segment[] = {
00465     { MATROSKA_ID_INFO,           EBML_NEST, 0, 0, {.n=matroska_info       } },
00466     { MATROSKA_ID_TRACKS,         EBML_NEST, 0, 0, {.n=matroska_tracks     } },
00467     { MATROSKA_ID_ATTACHMENTS,    EBML_NEST, 0, 0, {.n=matroska_attachments} },
00468     { MATROSKA_ID_CHAPTERS,       EBML_NEST, 0, 0, {.n=matroska_chapters   } },
00469     { MATROSKA_ID_CUES,           EBML_NEST, 0, 0, {.n=matroska_index      } },
00470     { MATROSKA_ID_TAGS,           EBML_NEST, 0, 0, {.n=matroska_tags       } },
00471     { MATROSKA_ID_SEEKHEAD,       EBML_NEST, 0, 0, {.n=matroska_seekhead   } },
00472     { MATROSKA_ID_CLUSTER,        EBML_STOP, 0, offsetof(MatroskaDemuxContext,has_cluster_id) },
00473     { 0 }
00474 };
00475 
00476 static EbmlSyntax matroska_segments[] = {
00477     { MATROSKA_ID_SEGMENT,        EBML_NEST, 0, 0, {.n=matroska_segment    } },
00478     { 0 }
00479 };
00480 
00481 static EbmlSyntax matroska_blockgroup[] = {
00482     { MATROSKA_ID_BLOCK,          EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
00483     { MATROSKA_ID_SIMPLEBLOCK,    EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
00484     { MATROSKA_ID_BLOCKDURATION,  EBML_UINT, 0, offsetof(MatroskaBlock,duration), {.u=AV_NOPTS_VALUE} },
00485     { MATROSKA_ID_BLOCKREFERENCE, EBML_UINT, 0, offsetof(MatroskaBlock,reference) },
00486     { 1,                          EBML_UINT, 0, offsetof(MatroskaBlock,non_simple), {.u=1} },
00487     { 0 }
00488 };
00489 
00490 static EbmlSyntax matroska_cluster[] = {
00491     { MATROSKA_ID_CLUSTERTIMECODE,EBML_UINT,0, offsetof(MatroskaCluster,timecode) },
00492     { MATROSKA_ID_BLOCKGROUP,     EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
00493     { MATROSKA_ID_SIMPLEBLOCK,    EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
00494     { MATROSKA_ID_CLUSTERPOSITION,EBML_NONE },
00495     { MATROSKA_ID_CLUSTERPREVSIZE,EBML_NONE },
00496     { 0 }
00497 };
00498 
00499 static EbmlSyntax matroska_clusters[] = {
00500     { MATROSKA_ID_CLUSTER,        EBML_NEST, 0, 0, {.n=matroska_cluster} },
00501     { MATROSKA_ID_INFO,           EBML_NONE },
00502     { MATROSKA_ID_CUES,           EBML_NONE },
00503     { MATROSKA_ID_TAGS,           EBML_NONE },
00504     { MATROSKA_ID_SEEKHEAD,       EBML_NONE },
00505     { 0 }
00506 };
00507 
00508 static const char *matroska_doctypes[] = { "matroska", "webm" };
00509 
00510 /*
00511  * Return: Whether we reached the end of a level in the hierarchy or not.
00512  */
00513 static int ebml_level_end(MatroskaDemuxContext *matroska)
00514 {
00515     ByteIOContext *pb = matroska->ctx->pb;
00516     int64_t pos = url_ftell(pb);
00517 
00518     if (matroska->num_levels > 0) {
00519         MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
00520         if (pos - level->start >= level->length) {
00521             matroska->num_levels--;
00522             return 1;
00523         }
00524     }
00525     return 0;
00526 }
00527 
00528 /*
00529  * Read: an "EBML number", which is defined as a variable-length
00530  * array of bytes. The first byte indicates the length by giving a
00531  * number of 0-bits followed by a one. The position of the first
00532  * "one" bit inside the first byte indicates the length of this
00533  * number.
00534  * Returns: number of bytes read, < 0 on error
00535  */
00536 static int ebml_read_num(MatroskaDemuxContext *matroska, ByteIOContext *pb,
00537                          int max_size, uint64_t *number)
00538 {
00539     int len_mask = 0x80, read = 1, n = 1;
00540     int64_t total = 0;
00541 
00542     /* The first byte tells us the length in bytes - get_byte() can normally
00543      * return 0, but since that's not a valid first ebmlID byte, we can
00544      * use it safely here to catch EOS. */
00545     if (!(total = get_byte(pb))) {
00546         /* we might encounter EOS here */
00547         if (!url_feof(pb)) {
00548             int64_t pos = url_ftell(pb);
00549             av_log(matroska->ctx, AV_LOG_ERROR,
00550                    "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
00551                    pos, pos);
00552         }
00553         return AVERROR(EIO); /* EOS or actual I/O error */
00554     }
00555 
00556     /* get the length of the EBML number */
00557     while (read <= max_size && !(total & len_mask)) {
00558         read++;
00559         len_mask >>= 1;
00560     }
00561     if (read > max_size) {
00562         int64_t pos = url_ftell(pb) - 1;
00563         av_log(matroska->ctx, AV_LOG_ERROR,
00564                "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
00565                (uint8_t) total, pos, pos);
00566         return AVERROR_INVALIDDATA;
00567     }
00568 
00569     /* read out length */
00570     total &= ~len_mask;
00571     while (n++ < read)
00572         total = (total << 8) | get_byte(pb);
00573 
00574     *number = total;
00575 
00576     return read;
00577 }
00578 
00579 /*
00580  * Read the next element as an unsigned int.
00581  * 0 is success, < 0 is failure.
00582  */
00583 static int ebml_read_uint(ByteIOContext *pb, int size, uint64_t *num)
00584 {
00585     int n = 0;
00586 
00587     if (size < 1 || size > 8)
00588         return AVERROR_INVALIDDATA;
00589 
00590     /* big-endian ordering; build up number */
00591     *num = 0;
00592     while (n++ < size)
00593         *num = (*num << 8) | get_byte(pb);
00594 
00595     return 0;
00596 }
00597 
00598 /*
00599  * Read the next element as a float.
00600  * 0 is success, < 0 is failure.
00601  */
00602 static int ebml_read_float(ByteIOContext *pb, int size, double *num)
00603 {
00604     if (size == 4) {
00605         *num= av_int2flt(get_be32(pb));
00606     } else if(size==8){
00607         *num= av_int2dbl(get_be64(pb));
00608     } else
00609         return AVERROR_INVALIDDATA;
00610 
00611     return 0;
00612 }
00613 
00614 /*
00615  * Read the next element as an ASCII string.
00616  * 0 is success, < 0 is failure.
00617  */
00618 static int ebml_read_ascii(ByteIOContext *pb, int size, char **str)
00619 {
00620     av_free(*str);
00621     /* EBML strings are usually not 0-terminated, so we allocate one
00622      * byte more, read the string and NULL-terminate it ourselves. */
00623     if (!(*str = av_malloc(size + 1)))
00624         return AVERROR(ENOMEM);
00625     if (get_buffer(pb, (uint8_t *) *str, size) != size) {
00626         av_free(*str);
00627         return AVERROR(EIO);
00628     }
00629     (*str)[size] = '\0';
00630 
00631     return 0;
00632 }
00633 
00634 /*
00635  * Read the next element as binary data.
00636  * 0 is success, < 0 is failure.
00637  */
00638 static int ebml_read_binary(ByteIOContext *pb, int length, EbmlBin *bin)
00639 {
00640     av_free(bin->data);
00641     if (!(bin->data = av_malloc(length)))
00642         return AVERROR(ENOMEM);
00643 
00644     bin->size = length;
00645     bin->pos  = url_ftell(pb);
00646     if (get_buffer(pb, bin->data, length) != length)
00647         return AVERROR(EIO);
00648 
00649     return 0;
00650 }
00651 
00652 /*
00653  * Read the next element, but only the header. The contents
00654  * are supposed to be sub-elements which can be read separately.
00655  * 0 is success, < 0 is failure.
00656  */
00657 static int ebml_read_master(MatroskaDemuxContext *matroska, int length)
00658 {
00659     ByteIOContext *pb = matroska->ctx->pb;
00660     MatroskaLevel *level;
00661 
00662     if (matroska->num_levels >= EBML_MAX_DEPTH) {
00663         av_log(matroska->ctx, AV_LOG_ERROR,
00664                "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
00665         return AVERROR(ENOSYS);
00666     }
00667 
00668     level = &matroska->levels[matroska->num_levels++];
00669     level->start = url_ftell(pb);
00670     level->length = length;
00671 
00672     return 0;
00673 }
00674 
00675 /*
00676  * Read signed/unsigned "EBML" numbers.
00677  * Return: number of bytes processed, < 0 on error
00678  */
00679 static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
00680                                  uint8_t *data, uint32_t size, uint64_t *num)
00681 {
00682     ByteIOContext pb;
00683     init_put_byte(&pb, data, size, 0, NULL, NULL, NULL, NULL);
00684     return ebml_read_num(matroska, &pb, 8, num);
00685 }
00686 
00687 /*
00688  * Same as above, but signed.
00689  */
00690 static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
00691                                  uint8_t *data, uint32_t size, int64_t *num)
00692 {
00693     uint64_t unum;
00694     int res;
00695 
00696     /* read as unsigned number first */
00697     if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
00698         return res;
00699 
00700     /* make signed (weird way) */
00701     *num = unum - ((1LL << (7*res - 1)) - 1);
00702 
00703     return res;
00704 }
00705 
00706 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
00707                            EbmlSyntax *syntax, void *data);
00708 
00709 static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
00710                          uint32_t id, void *data)
00711 {
00712     int i;
00713     for (i=0; syntax[i].id; i++)
00714         if (id == syntax[i].id)
00715             break;
00716     if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32)
00717         av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
00718     return ebml_parse_elem(matroska, &syntax[i], data);
00719 }
00720 
00721 static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
00722                       void *data)
00723 {
00724     uint64_t id;
00725     int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
00726     id |= 1 << 7*res;
00727     return res < 0 ? res : ebml_parse_id(matroska, syntax, id, data);
00728 }
00729 
00730 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
00731                            void *data)
00732 {
00733     int i, res = 0;
00734 
00735     for (i=0; syntax[i].id; i++)
00736         switch (syntax[i].type) {
00737         case EBML_UINT:
00738             *(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
00739             break;
00740         case EBML_FLOAT:
00741             *(double   *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
00742             break;
00743         case EBML_STR:
00744         case EBML_UTF8:
00745             *(char    **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
00746             break;
00747         }
00748 
00749     while (!res && !ebml_level_end(matroska))
00750         res = ebml_parse(matroska, syntax, data);
00751 
00752     return res;
00753 }
00754 
00755 static int ebml_parse_elem(MatroskaDemuxContext *matroska,
00756                            EbmlSyntax *syntax, void *data)
00757 {
00758     ByteIOContext *pb = matroska->ctx->pb;
00759     uint32_t id = syntax->id;
00760     uint64_t length;
00761     int res;
00762 
00763     data = (char *)data + syntax->data_offset;
00764     if (syntax->list_elem_size) {
00765         EbmlList *list = data;
00766         list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
00767         data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
00768         memset(data, 0, syntax->list_elem_size);
00769         list->nb_elem++;
00770     }
00771 
00772     if (syntax->type != EBML_PASS && syntax->type != EBML_STOP)
00773         if ((res = ebml_read_num(matroska, pb, 8, &length)) < 0)
00774             return res;
00775 
00776     switch (syntax->type) {
00777     case EBML_UINT:  res = ebml_read_uint  (pb, length, data);  break;
00778     case EBML_FLOAT: res = ebml_read_float (pb, length, data);  break;
00779     case EBML_STR:
00780     case EBML_UTF8:  res = ebml_read_ascii (pb, length, data);  break;
00781     case EBML_BIN:   res = ebml_read_binary(pb, length, data);  break;
00782     case EBML_NEST:  if ((res=ebml_read_master(matroska, length)) < 0)
00783                          return res;
00784                      if (id == MATROSKA_ID_SEGMENT)
00785                          matroska->segment_start = url_ftell(matroska->ctx->pb);
00786                      return ebml_parse_nest(matroska, syntax->def.n, data);
00787     case EBML_PASS:  return ebml_parse_id(matroska, syntax->def.n, id, data);
00788     case EBML_STOP:  *(int *)data = 1;      return 1;
00789     default:         return url_fseek(pb,length,SEEK_CUR)<0 ? AVERROR(EIO) : 0;
00790     }
00791     if (res == AVERROR_INVALIDDATA)
00792         av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
00793     else if (res == AVERROR(EIO))
00794         av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
00795     return res;
00796 }
00797 
00798 static void ebml_free(EbmlSyntax *syntax, void *data)
00799 {
00800     int i, j;
00801     for (i=0; syntax[i].id; i++) {
00802         void *data_off = (char *)data + syntax[i].data_offset;
00803         switch (syntax[i].type) {
00804         case EBML_STR:
00805         case EBML_UTF8:  av_freep(data_off);                      break;
00806         case EBML_BIN:   av_freep(&((EbmlBin *)data_off)->data);  break;
00807         case EBML_NEST:
00808             if (syntax[i].list_elem_size) {
00809                 EbmlList *list = data_off;
00810                 char *ptr = list->elem;
00811                 for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
00812                     ebml_free(syntax[i].def.n, ptr);
00813                 av_free(list->elem);
00814             } else
00815                 ebml_free(syntax[i].def.n, data_off);
00816         default:  break;
00817         }
00818     }
00819 }
00820 
00821 
00822 /*
00823  * Autodetecting...
00824  */
00825 static int matroska_probe(AVProbeData *p)
00826 {
00827     uint64_t total = 0;
00828     int len_mask = 0x80, size = 1, n = 1, i;
00829 
00830     /* EBML header? */
00831     if (AV_RB32(p->buf) != EBML_ID_HEADER)
00832         return 0;
00833 
00834     /* length of header */
00835     total = p->buf[4];
00836     while (size <= 8 && !(total & len_mask)) {
00837         size++;
00838         len_mask >>= 1;
00839     }
00840     if (size > 8)
00841       return 0;
00842     total &= (len_mask - 1);
00843     while (n < size)
00844         total = (total << 8) | p->buf[4 + n++];
00845 
00846     /* Does the probe data contain the whole header? */
00847     if (p->buf_size < 4 + size + total)
00848       return 0;
00849 
00850     /* The header should contain a known document type. For now,
00851      * we don't parse the whole header but simply check for the
00852      * availability of that array of characters inside the header.
00853      * Not fully fool-proof, but good enough. */
00854     for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
00855         int probelen = strlen(matroska_doctypes[i]);
00856         for (n = 4+size; n <= 4+size+total-probelen; n++)
00857             if (!memcmp(p->buf+n, matroska_doctypes[i], probelen))
00858                 return AVPROBE_SCORE_MAX;
00859     }
00860 
00861     // probably valid EBML header but no recognized doctype
00862     return AVPROBE_SCORE_MAX/2;
00863 }
00864 
00865 static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
00866                                                  int num)
00867 {
00868     MatroskaTrack *tracks = matroska->tracks.elem;
00869     int i;
00870 
00871     for (i=0; i < matroska->tracks.nb_elem; i++)
00872         if (tracks[i].num == num)
00873             return &tracks[i];
00874 
00875     av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
00876     return NULL;
00877 }
00878 
00879 static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
00880                                   MatroskaTrack *track)
00881 {
00882     MatroskaTrackEncoding *encodings = track->encodings.elem;
00883     uint8_t* data = *buf;
00884     int isize = *buf_size;
00885     uint8_t* pkt_data = NULL;
00886     int pkt_size = isize;
00887     int result = 0;
00888     int olen;
00889 
00890     switch (encodings[0].compression.algo) {
00891     case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
00892         return encodings[0].compression.settings.size;
00893     case MATROSKA_TRACK_ENCODING_COMP_LZO:
00894         do {
00895             olen = pkt_size *= 3;
00896             pkt_data = av_realloc(pkt_data, pkt_size+AV_LZO_OUTPUT_PADDING);
00897             result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
00898         } while (result==AV_LZO_OUTPUT_FULL && pkt_size<10000000);
00899         if (result)
00900             goto failed;
00901         pkt_size -= olen;
00902         break;
00903 #if CONFIG_ZLIB
00904     case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
00905         z_stream zstream = {0};
00906         if (inflateInit(&zstream) != Z_OK)
00907             return -1;
00908         zstream.next_in = data;
00909         zstream.avail_in = isize;
00910         do {
00911             pkt_size *= 3;
00912             pkt_data = av_realloc(pkt_data, pkt_size);
00913             zstream.avail_out = pkt_size - zstream.total_out;
00914             zstream.next_out = pkt_data + zstream.total_out;
00915             result = inflate(&zstream, Z_NO_FLUSH);
00916         } while (result==Z_OK && pkt_size<10000000);
00917         pkt_size = zstream.total_out;
00918         inflateEnd(&zstream);
00919         if (result != Z_STREAM_END)
00920             goto failed;
00921         break;
00922     }
00923 #endif
00924 #if CONFIG_BZLIB
00925     case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
00926         bz_stream bzstream = {0};
00927         if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
00928             return -1;
00929         bzstream.next_in = data;
00930         bzstream.avail_in = isize;
00931         do {
00932             pkt_size *= 3;
00933             pkt_data = av_realloc(pkt_data, pkt_size);
00934             bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
00935             bzstream.next_out = pkt_data + bzstream.total_out_lo32;
00936             result = BZ2_bzDecompress(&bzstream);
00937         } while (result==BZ_OK && pkt_size<10000000);
00938         pkt_size = bzstream.total_out_lo32;
00939         BZ2_bzDecompressEnd(&bzstream);
00940         if (result != BZ_STREAM_END)
00941             goto failed;
00942         break;
00943     }
00944 #endif
00945     default:
00946         return -1;
00947     }
00948 
00949     *buf = pkt_data;
00950     *buf_size = pkt_size;
00951     return 0;
00952  failed:
00953     av_free(pkt_data);
00954     return -1;
00955 }
00956 
00957 static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
00958                                     AVPacket *pkt, uint64_t display_duration)
00959 {
00960     char *line, *layer, *ptr = pkt->data, *end = ptr+pkt->size;
00961     for (; *ptr!=',' && ptr<end-1; ptr++);
00962     if (*ptr == ',')
00963         layer = ++ptr;
00964     for (; *ptr!=',' && ptr<end-1; ptr++);
00965     if (*ptr == ',') {
00966         int64_t end_pts = pkt->pts + display_duration;
00967         int sc = matroska->time_scale * pkt->pts / 10000000;
00968         int ec = matroska->time_scale * end_pts  / 10000000;
00969         int sh, sm, ss, eh, em, es, len;
00970         sh = sc/360000;  sc -= 360000*sh;
00971         sm = sc/  6000;  sc -=   6000*sm;
00972         ss = sc/   100;  sc -=    100*ss;
00973         eh = ec/360000;  ec -= 360000*eh;
00974         em = ec/  6000;  ec -=   6000*em;
00975         es = ec/   100;  ec -=    100*es;
00976         *ptr++ = '\0';
00977         len = 50 + end-ptr + FF_INPUT_BUFFER_PADDING_SIZE;
00978         if (!(line = av_malloc(len)))
00979             return;
00980         snprintf(line,len,"Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
00981                  layer, sh, sm, ss, sc, eh, em, es, ec, ptr);
00982         av_free(pkt->data);
00983         pkt->data = line;
00984         pkt->size = strlen(line);
00985     }
00986 }
00987 
00988 static void matroska_merge_packets(AVPacket *out, AVPacket *in)
00989 {
00990     out->data = av_realloc(out->data, out->size+in->size);
00991     memcpy(out->data+out->size, in->data, in->size);
00992     out->size += in->size;
00993     av_destruct_packet(in);
00994     av_free(in);
00995 }
00996 
00997 static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
00998                                  AVMetadata **metadata, char *prefix)
00999 {
01000     MatroskaTag *tags = list->elem;
01001     char key[1024];
01002     int i;
01003 
01004     for (i=0; i < list->nb_elem; i++) {
01005         const char *lang = strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
01006         if (prefix)  snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
01007         else         av_strlcpy(key, tags[i].name, sizeof(key));
01008         if (tags[i].def || !lang) {
01009         av_metadata_set2(metadata, key, tags[i].string, 0);
01010         if (tags[i].sub.nb_elem)
01011             matroska_convert_tag(s, &tags[i].sub, metadata, key);
01012         }
01013         if (lang) {
01014             av_strlcat(key, "-", sizeof(key));
01015             av_strlcat(key, lang, sizeof(key));
01016             av_metadata_set2(metadata, key, tags[i].string, 0);
01017             if (tags[i].sub.nb_elem)
01018                 matroska_convert_tag(s, &tags[i].sub, metadata, key);
01019         }
01020     }
01021 }
01022 
01023 static void matroska_convert_tags(AVFormatContext *s)
01024 {
01025     MatroskaDemuxContext *matroska = s->priv_data;
01026     MatroskaTags *tags = matroska->tags.elem;
01027     int i, j;
01028 
01029     for (i=0; i < matroska->tags.nb_elem; i++) {
01030         if (tags[i].target.attachuid) {
01031             MatroskaAttachement *attachment = matroska->attachments.elem;
01032             for (j=0; j<matroska->attachments.nb_elem; j++)
01033                 if (attachment[j].uid == tags[i].target.attachuid)
01034                     matroska_convert_tag(s, &tags[i].tag,
01035                                          &attachment[j].stream->metadata, NULL);
01036         } else if (tags[i].target.chapteruid) {
01037             MatroskaChapter *chapter = matroska->chapters.elem;
01038             for (j=0; j<matroska->chapters.nb_elem; j++)
01039                 if (chapter[j].uid == tags[i].target.chapteruid)
01040                     matroska_convert_tag(s, &tags[i].tag,
01041                                          &chapter[j].chapter->metadata, NULL);
01042         } else if (tags[i].target.trackuid) {
01043             MatroskaTrack *track = matroska->tracks.elem;
01044             for (j=0; j<matroska->tracks.nb_elem; j++)
01045                 if (track[j].uid == tags[i].target.trackuid)
01046                     matroska_convert_tag(s, &tags[i].tag,
01047                                          &track[j].stream->metadata, NULL);
01048         } else {
01049             matroska_convert_tag(s, &tags[i].tag, &s->metadata,
01050                                  tags[i].target.type);
01051         }
01052     }
01053 }
01054 
01055 static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
01056 {
01057     EbmlList *seekhead_list = &matroska->seekhead;
01058     MatroskaSeekhead *seekhead = seekhead_list->elem;
01059     uint32_t level_up = matroska->level_up;
01060     int64_t before_pos = url_ftell(matroska->ctx->pb);
01061     MatroskaLevel level;
01062     int i;
01063 
01064     for (i=0; i<seekhead_list->nb_elem; i++) {
01065         int64_t offset = seekhead[i].pos + matroska->segment_start;
01066 
01067         if (seekhead[i].pos <= before_pos
01068             || seekhead[i].id == MATROSKA_ID_SEEKHEAD
01069             || seekhead[i].id == MATROSKA_ID_CLUSTER)
01070             continue;
01071 
01072         /* seek */
01073         if (url_fseek(matroska->ctx->pb, offset, SEEK_SET) != offset)
01074             continue;
01075 
01076         /* We don't want to lose our seekhead level, so we add
01077          * a dummy. This is a crude hack. */
01078         if (matroska->num_levels == EBML_MAX_DEPTH) {
01079             av_log(matroska->ctx, AV_LOG_INFO,
01080                    "Max EBML element depth (%d) reached, "
01081                    "cannot parse further.\n", EBML_MAX_DEPTH);
01082             break;
01083         }
01084 
01085         level.start = 0;
01086         level.length = (uint64_t)-1;
01087         matroska->levels[matroska->num_levels] = level;
01088         matroska->num_levels++;
01089 
01090         ebml_parse(matroska, matroska_segment, matroska);
01091 
01092         /* remove dummy level */
01093         while (matroska->num_levels) {
01094             uint64_t length = matroska->levels[--matroska->num_levels].length;
01095             if (length == (uint64_t)-1)
01096                 break;
01097         }
01098     }
01099 
01100     /* seek back */
01101     url_fseek(matroska->ctx->pb, before_pos, SEEK_SET);
01102     matroska->level_up = level_up;
01103 }
01104 
01105 static int matroska_aac_profile(char *codec_id)
01106 {
01107     static const char * const aac_profiles[] = { "MAIN", "LC", "SSR" };
01108     int profile;
01109 
01110     for (profile=0; profile<FF_ARRAY_ELEMS(aac_profiles); profile++)
01111         if (strstr(codec_id, aac_profiles[profile]))
01112             break;
01113     return profile + 1;
01114 }
01115 
01116 static int matroska_aac_sri(int samplerate)
01117 {
01118     int sri;
01119 
01120     for (sri=0; sri<FF_ARRAY_ELEMS(ff_mpeg4audio_sample_rates); sri++)
01121         if (ff_mpeg4audio_sample_rates[sri] == samplerate)
01122             break;
01123     return sri;
01124 }
01125 
01126 static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
01127 {
01128     MatroskaDemuxContext *matroska = s->priv_data;
01129     EbmlList *attachements_list = &matroska->attachments;
01130     MatroskaAttachement *attachements;
01131     EbmlList *chapters_list = &matroska->chapters;
01132     MatroskaChapter *chapters;
01133     MatroskaTrack *tracks;
01134     EbmlList *index_list;
01135     MatroskaIndex *index;
01136     int index_scale = 1;
01137     uint64_t max_start = 0;
01138     Ebml ebml = { 0 };
01139     AVStream *st;
01140     int i, j;
01141 
01142     matroska->ctx = s;
01143 
01144     /* First read the EBML header. */
01145     if (ebml_parse(matroska, ebml_syntax, &ebml)
01146         || ebml.version > EBML_VERSION       || ebml.max_size > sizeof(uint64_t)
01147         || ebml.id_length > sizeof(uint32_t) || ebml.doctype_version > 2) {
01148         av_log(matroska->ctx, AV_LOG_ERROR,
01149                "EBML header using unsupported features\n"
01150                "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
01151                ebml.version, ebml.doctype, ebml.doctype_version);
01152         ebml_free(ebml_syntax, &ebml);
01153         return AVERROR_PATCHWELCOME;
01154     }
01155     for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
01156         if (!strcmp(ebml.doctype, matroska_doctypes[i]))
01157             break;
01158     if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
01159         av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
01160     }
01161     av_metadata_set2(&s->metadata, "doctype", ebml.doctype, 0);
01162     ebml_free(ebml_syntax, &ebml);
01163 
01164     /* The next thing is a segment. */
01165     if (ebml_parse(matroska, matroska_segments, matroska) < 0)
01166         return -1;
01167     matroska_execute_seekhead(matroska);
01168 
01169     if (matroska->duration)
01170         matroska->ctx->duration = matroska->duration * matroska->time_scale
01171                                   * 1000 / AV_TIME_BASE;
01172     av_metadata_set2(&s->metadata, "title", matroska->title, 0);
01173 
01174     tracks = matroska->tracks.elem;
01175     for (i=0; i < matroska->tracks.nb_elem; i++) {
01176         MatroskaTrack *track = &tracks[i];
01177         enum CodecID codec_id = CODEC_ID_NONE;
01178         EbmlList *encodings_list = &tracks->encodings;
01179         MatroskaTrackEncoding *encodings = encodings_list->elem;
01180         uint8_t *extradata = NULL;
01181         int extradata_size = 0;
01182         int extradata_offset = 0;
01183         ByteIOContext b;
01184 
01185         /* Apply some sanity checks. */
01186         if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
01187             track->type != MATROSKA_TRACK_TYPE_AUDIO &&
01188             track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
01189             av_log(matroska->ctx, AV_LOG_INFO,
01190                    "Unknown or unsupported track type %"PRIu64"\n",
01191                    track->type);
01192             continue;
01193         }
01194         if (track->codec_id == NULL)
01195             continue;
01196 
01197         if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
01198             if (!track->default_duration)
01199                 track->default_duration = 1000000000/track->video.frame_rate;
01200             if (!track->video.display_width)
01201                 track->video.display_width = track->video.pixel_width;
01202             if (!track->video.display_height)
01203                 track->video.display_height = track->video.pixel_height;
01204         } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
01205             if (!track->audio.out_samplerate)
01206                 track->audio.out_samplerate = track->audio.samplerate;
01207         }
01208         if (encodings_list->nb_elem > 1) {
01209             av_log(matroska->ctx, AV_LOG_ERROR,
01210                    "Multiple combined encodings no supported");
01211         } else if (encodings_list->nb_elem == 1) {
01212             if (encodings[0].type ||
01213                 (encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
01214 #if CONFIG_ZLIB
01215                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
01216 #endif
01217 #if CONFIG_BZLIB
01218                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
01219 #endif
01220                  encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
01221                 encodings[0].scope = 0;
01222                 av_log(matroska->ctx, AV_LOG_ERROR,
01223                        "Unsupported encoding type");
01224             } else if (track->codec_priv.size && encodings[0].scope&2) {
01225                 uint8_t *codec_priv = track->codec_priv.data;
01226                 int offset = matroska_decode_buffer(&track->codec_priv.data,
01227                                                     &track->codec_priv.size,
01228                                                     track);
01229                 if (offset < 0) {
01230                     track->codec_priv.data = NULL;
01231                     track->codec_priv.size = 0;
01232                     av_log(matroska->ctx, AV_LOG_ERROR,
01233                            "Failed to decode codec private data\n");
01234                 } else if (offset > 0) {
01235                     track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
01236                     memcpy(track->codec_priv.data,
01237                            encodings[0].compression.settings.data, offset);
01238                     memcpy(track->codec_priv.data+offset, codec_priv,
01239                            track->codec_priv.size);
01240                     track->codec_priv.size += offset;
01241                 }
01242                 if (codec_priv != track->codec_priv.data)
01243                     av_free(codec_priv);
01244             }
01245         }
01246 
01247         for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
01248             if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
01249                         strlen(ff_mkv_codec_tags[j].str))){
01250                 codec_id= ff_mkv_codec_tags[j].id;
01251                 break;
01252             }
01253         }
01254 
01255         st = track->stream = av_new_stream(s, 0);
01256         if (st == NULL)
01257             return AVERROR(ENOMEM);
01258 
01259         if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")
01260             && track->codec_priv.size >= 40
01261             && track->codec_priv.data != NULL) {
01262             track->ms_compat = 1;
01263             track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
01264             codec_id = ff_codec_get_id(ff_codec_bmp_tags, track->video.fourcc);
01265             extradata_offset = 40;
01266         } else if (!strcmp(track->codec_id, "A_MS/ACM")
01267                    && track->codec_priv.size >= 14
01268                    && track->codec_priv.data != NULL) {
01269             init_put_byte(&b, track->codec_priv.data, track->codec_priv.size,
01270                           URL_RDONLY, NULL, NULL, NULL, NULL);
01271             ff_get_wav_header(&b, st->codec, track->codec_priv.size);
01272             codec_id = st->codec->codec_id;
01273             extradata_offset = FFMIN(track->codec_priv.size, 18);
01274         } else if (!strcmp(track->codec_id, "V_QUICKTIME")
01275                    && (track->codec_priv.size >= 86)
01276                    && (track->codec_priv.data != NULL)) {
01277             track->video.fourcc = AV_RL32(track->codec_priv.data);
01278             codec_id=ff_codec_get_id(codec_movvideo_tags, track->video.fourcc);
01279         } else if (codec_id == CODEC_ID_PCM_S16BE) {
01280             switch (track->audio.bitdepth) {
01281             case  8:  codec_id = CODEC_ID_PCM_U8;     break;
01282             case 24:  codec_id = CODEC_ID_PCM_S24BE;  break;
01283             case 32:  codec_id = CODEC_ID_PCM_S32BE;  break;
01284             }
01285         } else if (codec_id == CODEC_ID_PCM_S16LE) {
01286             switch (track->audio.bitdepth) {
01287             case  8:  codec_id = CODEC_ID_PCM_U8;     break;
01288             case 24:  codec_id = CODEC_ID_PCM_S24LE;  break;
01289             case 32:  codec_id = CODEC_ID_PCM_S32LE;  break;
01290             }
01291         } else if (codec_id==CODEC_ID_PCM_F32LE && track->audio.bitdepth==64) {
01292             codec_id = CODEC_ID_PCM_F64LE;
01293         } else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
01294             int profile = matroska_aac_profile(track->codec_id);
01295             int sri = matroska_aac_sri(track->audio.samplerate);
01296             extradata = av_malloc(5);
01297             if (extradata == NULL)
01298                 return AVERROR(ENOMEM);
01299             extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
01300             extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
01301             if (strstr(track->codec_id, "SBR")) {
01302                 sri = matroska_aac_sri(track->audio.out_samplerate);
01303                 extradata[2] = 0x56;
01304                 extradata[3] = 0xE5;
01305                 extradata[4] = 0x80 | (sri<<3);
01306                 extradata_size = 5;
01307             } else
01308                 extradata_size = 2;
01309         } else if (codec_id == CODEC_ID_TTA) {
01310             extradata_size = 30;
01311             extradata = av_mallocz(extradata_size);
01312             if (extradata == NULL)
01313                 return AVERROR(ENOMEM);
01314             init_put_byte(&b, extradata, extradata_size, 1,
01315                           NULL, NULL, NULL, NULL);
01316             put_buffer(&b, "TTA1", 4);
01317             put_le16(&b, 1);
01318             put_le16(&b, track->audio.channels);
01319             put_le16(&b, track->audio.bitdepth);
01320             put_le32(&b, track->audio.out_samplerate);
01321             put_le32(&b, matroska->ctx->duration * track->audio.out_samplerate);
01322         } else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
01323                    codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
01324             extradata_offset = 26;
01325         } else if (codec_id == CODEC_ID_RA_144) {
01326             track->audio.out_samplerate = 8000;
01327             track->audio.channels = 1;
01328         } else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
01329                    codec_id == CODEC_ID_ATRAC3 || codec_id == CODEC_ID_SIPR) {
01330             int flavor;
01331             init_put_byte(&b, track->codec_priv.data,track->codec_priv.size,
01332                           0, NULL, NULL, NULL, NULL);
01333             url_fskip(&b, 22);
01334             flavor                       = get_be16(&b);
01335             track->audio.coded_framesize = get_be32(&b);
01336             url_fskip(&b, 12);
01337             track->audio.sub_packet_h    = get_be16(&b);
01338             track->audio.frame_size      = get_be16(&b);
01339             track->audio.sub_packet_size = get_be16(&b);
01340             track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
01341             if (codec_id == CODEC_ID_RA_288) {
01342                 st->codec->block_align = track->audio.coded_framesize;
01343                 track->codec_priv.size = 0;
01344             } else {
01345                 if (codec_id == CODEC_ID_SIPR && flavor < 4) {
01346                     const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
01347                     track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
01348                     st->codec->bit_rate = sipr_bit_rate[flavor];
01349                 }
01350                 st->codec->block_align = track->audio.sub_packet_size;
01351                 extradata_offset = 78;
01352             }
01353         }
01354         track->codec_priv.size -= extradata_offset;
01355 
01356         if (codec_id == CODEC_ID_NONE)
01357             av_log(matroska->ctx, AV_LOG_INFO,
01358                    "Unknown/unsupported CodecID %s.\n", track->codec_id);
01359 
01360         if (track->time_scale < 0.01)
01361             track->time_scale = 1.0;
01362         av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
01363 
01364         st->codec->codec_id = codec_id;
01365         st->start_time = 0;
01366         if (strcmp(track->language, "und"))
01367             av_metadata_set2(&st->metadata, "language", track->language, 0);
01368         av_metadata_set2(&st->metadata, "title", track->name, 0);
01369 
01370         if (track->flag_default)
01371             st->disposition |= AV_DISPOSITION_DEFAULT;
01372 
01373         if (track->default_duration)
01374             av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
01375                       track->default_duration, 1000000000, 30000);
01376 
01377         if (!st->codec->extradata) {
01378             if(extradata){
01379                 st->codec->extradata = extradata;
01380                 st->codec->extradata_size = extradata_size;
01381             } else if(track->codec_priv.data && track->codec_priv.size > 0){
01382                 st->codec->extradata = av_mallocz(track->codec_priv.size +
01383                                                   FF_INPUT_BUFFER_PADDING_SIZE);
01384                 if(st->codec->extradata == NULL)
01385                     return AVERROR(ENOMEM);
01386                 st->codec->extradata_size = track->codec_priv.size;
01387                 memcpy(st->codec->extradata,
01388                        track->codec_priv.data + extradata_offset,
01389                        track->codec_priv.size);
01390             }
01391         }
01392 
01393         if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
01394             st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
01395             st->codec->codec_tag  = track->video.fourcc;
01396             st->codec->width  = track->video.pixel_width;
01397             st->codec->height = track->video.pixel_height;
01398             av_reduce(&st->sample_aspect_ratio.num,
01399                       &st->sample_aspect_ratio.den,
01400                       st->codec->height * track->video.display_width,
01401                       st->codec-> width * track->video.display_height,
01402                       255);
01403             if (st->codec->codec_id != CODEC_ID_H264)
01404             st->need_parsing = AVSTREAM_PARSE_HEADERS;
01405             if (track->default_duration)
01406                 st->avg_frame_rate = av_d2q(1000000000.0/track->default_duration, INT_MAX);
01407         } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
01408             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
01409             st->codec->sample_rate = track->audio.out_samplerate;
01410             st->codec->channels = track->audio.channels;
01411             if (st->codec->codec_id != CODEC_ID_AAC)
01412             st->need_parsing = AVSTREAM_PARSE_HEADERS;
01413         } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
01414             st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
01415         }
01416     }
01417 
01418     attachements = attachements_list->elem;
01419     for (j=0; j<attachements_list->nb_elem; j++) {
01420         if (!(attachements[j].filename && attachements[j].mime &&
01421               attachements[j].bin.data && attachements[j].bin.size > 0)) {
01422             av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
01423         } else {
01424             AVStream *st = av_new_stream(s, 0);
01425             if (st == NULL)
01426                 break;
01427             av_metadata_set2(&st->metadata, "filename",attachements[j].filename, 0);
01428             st->codec->codec_id = CODEC_ID_NONE;
01429             st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
01430             st->codec->extradata  = av_malloc(attachements[j].bin.size);
01431             if(st->codec->extradata == NULL)
01432                 break;
01433             st->codec->extradata_size = attachements[j].bin.size;
01434             memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
01435 
01436             for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
01437                 if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
01438                              strlen(ff_mkv_mime_tags[i].str))) {
01439                     st->codec->codec_id = ff_mkv_mime_tags[i].id;
01440                     break;
01441                 }
01442             }
01443             attachements[j].stream = st;
01444         }
01445     }
01446 
01447     chapters = chapters_list->elem;
01448     for (i=0; i<chapters_list->nb_elem; i++)
01449         if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid
01450             && (max_start==0 || chapters[i].start > max_start)) {
01451             chapters[i].chapter =
01452             ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
01453                            chapters[i].start, chapters[i].end,
01454                            chapters[i].title);
01455             av_metadata_set2(&chapters[i].chapter->metadata,
01456                              "title", chapters[i].title, 0);
01457             max_start = chapters[i].start;
01458         }
01459 
01460     index_list = &matroska->index;
01461     index = index_list->elem;
01462     if (index_list->nb_elem
01463         && index[0].time > 100000000000000/matroska->time_scale) {
01464         av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
01465         index_scale = matroska->time_scale;
01466     }
01467     for (i=0; i<index_list->nb_elem; i++) {
01468         EbmlList *pos_list = &index[i].pos;
01469         MatroskaIndexPos *pos = pos_list->elem;
01470         for (j=0; j<pos_list->nb_elem; j++) {
01471             MatroskaTrack *track = matroska_find_track_by_num(matroska,
01472                                                               pos[j].track);
01473             if (track && track->stream)
01474                 av_add_index_entry(track->stream,
01475                                    pos[j].pos + matroska->segment_start,
01476                                    index[i].time/index_scale, 0, 0,
01477                                    AVINDEX_KEYFRAME);
01478         }
01479     }
01480 
01481     matroska_convert_tags(s);
01482 
01483     return 0;
01484 }
01485 
01486 /*
01487  * Put one packet in an application-supplied AVPacket struct.
01488  * Returns 0 on success or -1 on failure.
01489  */
01490 static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
01491                                    AVPacket *pkt)
01492 {
01493     if (matroska->num_packets > 0) {
01494         memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
01495         av_free(matroska->packets[0]);
01496         if (matroska->num_packets > 1) {
01497             memmove(&matroska->packets[0], &matroska->packets[1],
01498                     (matroska->num_packets - 1) * sizeof(AVPacket *));
01499             matroska->packets =
01500                 av_realloc(matroska->packets, (matroska->num_packets - 1) *
01501                            sizeof(AVPacket *));
01502         } else {
01503             av_freep(&matroska->packets);
01504         }
01505         matroska->num_packets--;
01506         return 0;
01507     }
01508 
01509     return -1;
01510 }
01511 
01512 /*
01513  * Free all packets in our internal queue.
01514  */
01515 static void matroska_clear_queue(MatroskaDemuxContext *matroska)
01516 {
01517     if (matroska->packets) {
01518         int n;
01519         for (n = 0; n < matroska->num_packets; n++) {
01520             av_free_packet(matroska->packets[n]);
01521             av_free(matroska->packets[n]);
01522         }
01523         av_freep(&matroska->packets);
01524         matroska->num_packets = 0;
01525     }
01526 }
01527 
01528 static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
01529                                 int size, int64_t pos, uint64_t cluster_time,
01530                                 uint64_t duration, int is_keyframe,
01531                                 int64_t cluster_pos)
01532 {
01533     uint64_t timecode = AV_NOPTS_VALUE;
01534     MatroskaTrack *track;
01535     int res = 0;
01536     AVStream *st;
01537     AVPacket *pkt;
01538     int16_t block_time;
01539     uint32_t *lace_size = NULL;
01540     int n, flags, laces = 0;
01541     uint64_t num;
01542 
01543     if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
01544         av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
01545         return res;
01546     }
01547     data += n;
01548     size -= n;
01549 
01550     track = matroska_find_track_by_num(matroska, num);
01551     if (size <= 3 || !track || !track->stream) {
01552         av_log(matroska->ctx, AV_LOG_INFO,
01553                "Invalid stream %"PRIu64" or size %u\n", num, size);
01554         return res;
01555     }
01556     st = track->stream;
01557     if (st->discard >= AVDISCARD_ALL)
01558         return res;
01559     if (duration == AV_NOPTS_VALUE)
01560         duration = track->default_duration / matroska->time_scale;
01561 
01562     block_time = AV_RB16(data);
01563     data += 2;
01564     flags = *data++;
01565     size -= 3;
01566     if (is_keyframe == -1)
01567         is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
01568 
01569     if (cluster_time != (uint64_t)-1
01570         && (block_time >= 0 || cluster_time >= -block_time)) {
01571         timecode = cluster_time + block_time;
01572         if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE
01573             && timecode < track->end_timecode)
01574             is_keyframe = 0;  /* overlapping subtitles are not key frame */
01575         if (is_keyframe)
01576             av_add_index_entry(st, cluster_pos, timecode, 0,0,AVINDEX_KEYFRAME);
01577         track->end_timecode = FFMAX(track->end_timecode, timecode+duration);
01578     }
01579 
01580     if (matroska->skip_to_keyframe && track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
01581         if (!is_keyframe || timecode < matroska->skip_to_timecode)
01582             return res;
01583         matroska->skip_to_keyframe = 0;
01584     }
01585 
01586     switch ((flags & 0x06) >> 1) {
01587         case 0x0: /* no lacing */
01588             laces = 1;
01589             lace_size = av_mallocz(sizeof(int));
01590             lace_size[0] = size;
01591             break;
01592 
01593         case 0x1: /* Xiph lacing */
01594         case 0x2: /* fixed-size lacing */
01595         case 0x3: /* EBML lacing */
01596             assert(size>0); // size <=3 is checked before size-=3 above
01597             laces = (*data) + 1;
01598             data += 1;
01599             size -= 1;
01600             lace_size = av_mallocz(laces * sizeof(int));
01601 
01602             switch ((flags & 0x06) >> 1) {
01603                 case 0x1: /* Xiph lacing */ {
01604                     uint8_t temp;
01605                     uint32_t total = 0;
01606                     for (n = 0; res == 0 && n < laces - 1; n++) {
01607                         while (1) {
01608                             if (size == 0) {
01609                                 res = -1;
01610                                 break;
01611                             }
01612                             temp = *data;
01613                             lace_size[n] += temp;
01614                             data += 1;
01615                             size -= 1;
01616                             if (temp != 0xff)
01617                                 break;
01618                         }
01619                         total += lace_size[n];
01620                     }
01621                     lace_size[n] = size - total;
01622                     break;
01623                 }
01624 
01625                 case 0x2: /* fixed-size lacing */
01626                     for (n = 0; n < laces; n++)
01627                         lace_size[n] = size / laces;
01628                     break;
01629 
01630                 case 0x3: /* EBML lacing */ {
01631                     uint32_t total;
01632                     n = matroska_ebmlnum_uint(matroska, data, size, &num);
01633                     if (n < 0) {
01634                         av_log(matroska->ctx, AV_LOG_INFO,
01635                                "EBML block data error\n");
01636                         break;
01637                     }
01638                     data += n;
01639                     size -= n;
01640                     total = lace_size[0] = num;
01641                     for (n = 1; res == 0 && n < laces - 1; n++) {
01642                         int64_t snum;
01643                         int r;
01644                         r = matroska_ebmlnum_sint(matroska, data, size, &snum);
01645                         if (r < 0) {
01646                             av_log(matroska->ctx, AV_LOG_INFO,
01647                                    "EBML block data error\n");
01648                             break;
01649                         }
01650                         data += r;
01651                         size -= r;
01652                         lace_size[n] = lace_size[n - 1] + snum;
01653                         total += lace_size[n];
01654                     }
01655                     lace_size[n] = size - total;
01656                     break;
01657                 }
01658             }
01659             break;
01660     }
01661 
01662     if (res == 0) {
01663         for (n = 0; n < laces; n++) {
01664             if ((st->codec->codec_id == CODEC_ID_RA_288 ||
01665                  st->codec->codec_id == CODEC_ID_COOK ||
01666                  st->codec->codec_id == CODEC_ID_SIPR ||
01667                  st->codec->codec_id == CODEC_ID_ATRAC3) &&
01668                  st->codec->block_align && track->audio.sub_packet_size) {
01669                 int a = st->codec->block_align;
01670                 int sps = track->audio.sub_packet_size;
01671                 int cfs = track->audio.coded_framesize;
01672                 int h = track->audio.sub_packet_h;
01673                 int y = track->audio.sub_packet_cnt;
01674                 int w = track->audio.frame_size;
01675                 int x;
01676 
01677                 if (!track->audio.pkt_cnt) {
01678                     if (st->codec->codec_id == CODEC_ID_RA_288)
01679                         for (x=0; x<h/2; x++)
01680                             memcpy(track->audio.buf+x*2*w+y*cfs,
01681                                    data+x*cfs, cfs);
01682                     else if (st->codec->codec_id == CODEC_ID_SIPR)
01683                         memcpy(track->audio.buf + y*w, data, w);
01684                     else
01685                         for (x=0; x<w/sps; x++)
01686                             memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
01687 
01688                     if (++track->audio.sub_packet_cnt >= h) {
01689                         if (st->codec->codec_id == CODEC_ID_SIPR)
01690                             ff_rm_reorder_sipr_data(track->audio.buf, h, w);
01691                         track->audio.sub_packet_cnt = 0;
01692                         track->audio.pkt_cnt = h*w / a;
01693                     }
01694                 }
01695                 while (track->audio.pkt_cnt) {
01696                     pkt = av_mallocz(sizeof(AVPacket));
01697                     av_new_packet(pkt, a);
01698                     memcpy(pkt->data, track->audio.buf
01699                            + a * (h*w / a - track->audio.pkt_cnt--), a);
01700                     pkt->pos = pos;
01701                     pkt->stream_index = st->index;
01702                     dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
01703                 }
01704             } else {
01705                 MatroskaTrackEncoding *encodings = track->encodings.elem;
01706                 int offset = 0, pkt_size = lace_size[n];
01707                 uint8_t *pkt_data = data;
01708 
01709                 if (lace_size[n] > size) {
01710                     av_log(matroska->ctx, AV_LOG_ERROR, "Invalid packet size\n");
01711                     break;
01712                 }
01713 
01714                 if (encodings && encodings->scope & 1) {
01715                     offset = matroska_decode_buffer(&pkt_data,&pkt_size, track);
01716                     if (offset < 0)
01717                         continue;
01718                 }
01719 
01720                 pkt = av_mallocz(sizeof(AVPacket));
01721                 /* XXX: prevent data copy... */
01722                 if (av_new_packet(pkt, pkt_size+offset) < 0) {
01723                     av_free(pkt);
01724                     res = AVERROR(ENOMEM);
01725                     break;
01726                 }
01727                 if (offset)
01728                     memcpy (pkt->data, encodings->compression.settings.data, offset);
01729                 memcpy (pkt->data+offset, pkt_data, pkt_size);
01730 
01731                 if (pkt_data != data)
01732                     av_free(pkt_data);
01733 
01734                 if (n == 0)
01735                     pkt->flags = is_keyframe;
01736                 pkt->stream_index = st->index;
01737 
01738                 if (track->ms_compat)
01739                     pkt->dts = timecode;
01740                 else
01741                     pkt->pts = timecode;
01742                 pkt->pos = pos;
01743                 if (st->codec->codec_id == CODEC_ID_TEXT)
01744                     pkt->convergence_duration = duration;
01745                 else if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE)
01746                     pkt->duration = duration;
01747 
01748                 if (st->codec->codec_id == CODEC_ID_SSA)
01749                     matroska_fix_ass_packet(matroska, pkt, duration);
01750 
01751                 if (matroska->prev_pkt &&
01752                     timecode != AV_NOPTS_VALUE &&
01753                     matroska->prev_pkt->pts == timecode &&
01754                     matroska->prev_pkt->stream_index == st->index)
01755                     matroska_merge_packets(matroska->prev_pkt, pkt);
01756                 else {
01757                     dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
01758                     matroska->prev_pkt = pkt;
01759                 }
01760             }
01761 
01762             if (timecode != AV_NOPTS_VALUE)
01763                 timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
01764             data += lace_size[n];
01765             size -= lace_size[n];
01766         }
01767     }
01768 
01769     av_free(lace_size);
01770     return res;
01771 }
01772 
01773 static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
01774 {
01775     MatroskaCluster cluster = { 0 };
01776     EbmlList *blocks_list;
01777     MatroskaBlock *blocks;
01778     int i, res;
01779     int64_t pos = url_ftell(matroska->ctx->pb);
01780     matroska->prev_pkt = NULL;
01781     if (matroska->has_cluster_id){
01782         /* For the first cluster we parse, its ID was already read as
01783            part of matroska_read_header(), so don't read it again */
01784         res = ebml_parse_id(matroska, matroska_clusters,
01785                             MATROSKA_ID_CLUSTER, &cluster);
01786         pos -= 4;  /* sizeof the ID which was already read */
01787         matroska->has_cluster_id = 0;
01788     } else
01789         res = ebml_parse(matroska, matroska_clusters, &cluster);
01790     blocks_list = &cluster.blocks;
01791     blocks = blocks_list->elem;
01792     for (i=0; i<blocks_list->nb_elem; i++)
01793         if (blocks[i].bin.size > 0) {
01794             int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
01795             res=matroska_parse_block(matroska,
01796                                      blocks[i].bin.data, blocks[i].bin.size,
01797                                      blocks[i].bin.pos,  cluster.timecode,
01798                                      blocks[i].duration, is_keyframe,
01799                                      pos);
01800         }
01801     ebml_free(matroska_cluster, &cluster);
01802     if (res < 0)  matroska->done = 1;
01803     return res;
01804 }
01805 
01806 static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
01807 {
01808     MatroskaDemuxContext *matroska = s->priv_data;
01809 
01810     while (matroska_deliver_packet(matroska, pkt)) {
01811         if (matroska->done)
01812             return AVERROR_EOF;
01813         matroska_parse_cluster(matroska);
01814     }
01815 
01816     return 0;
01817 }
01818 
01819 static int matroska_read_seek(AVFormatContext *s, int stream_index,
01820                               int64_t timestamp, int flags)
01821 {
01822     MatroskaDemuxContext *matroska = s->priv_data;
01823     MatroskaTrack *tracks = matroska->tracks.elem;
01824     AVStream *st = s->streams[stream_index];
01825     int i, index, index_sub, index_min;
01826 
01827     if (!st->nb_index_entries)
01828         return 0;
01829     timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
01830 
01831     if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
01832         url_fseek(s->pb, st->index_entries[st->nb_index_entries-1].pos, SEEK_SET);
01833         while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
01834             matroska_clear_queue(matroska);
01835             if (matroska_parse_cluster(matroska) < 0)
01836                 break;
01837         }
01838     }
01839 
01840     matroska_clear_queue(matroska);
01841     if (index < 0)
01842         return 0;
01843 
01844     index_min = index;
01845     for (i=0; i < matroska->tracks.nb_elem; i++) {
01846         tracks[i].end_timecode = 0;
01847         if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE
01848             && !tracks[i].stream->discard != AVDISCARD_ALL) {
01849             index_sub = av_index_search_timestamp(tracks[i].stream, st->index_entries[index].timestamp, AVSEEK_FLAG_BACKWARD);
01850             if (index_sub >= 0
01851                 && st->index_entries[index_sub].pos < st->index_entries[index_min].pos
01852                 && st->index_entries[index].timestamp - st->index_entries[index_sub].timestamp < 30000000000/matroska->time_scale)
01853                 index_min = index_sub;
01854         }
01855     }
01856 
01857     url_fseek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
01858     matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
01859     matroska->skip_to_timecode = st->index_entries[index].timestamp;
01860     matroska->done = 0;
01861     av_update_cur_dts(s, st, st->index_entries[index].timestamp);
01862     return 0;
01863 }
01864 
01865 static int matroska_read_close(AVFormatContext *s)
01866 {
01867     MatroskaDemuxContext *matroska = s->priv_data;
01868     MatroskaTrack *tracks = matroska->tracks.elem;
01869     int n;
01870 
01871     matroska_clear_queue(matroska);
01872 
01873     for (n=0; n < matroska->tracks.nb_elem; n++)
01874         if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
01875             av_free(tracks[n].audio.buf);
01876     ebml_free(matroska_segment, matroska);
01877 
01878     return 0;
01879 }
01880 
01881 AVInputFormat matroska_demuxer = {
01882     "matroska",
01883     NULL_IF_CONFIG_SMALL("Matroska file format"),
01884     sizeof(MatroskaDemuxContext),
01885     matroska_probe,
01886     matroska_read_header,
01887     matroska_read_packet,
01888     matroska_read_close,
01889     matroska_read_seek,
01890     .metadata_conv = ff_mkv_metadata_conv,
01891 };

Generated on Fri Sep 16 2011 17:17:48 for FFmpeg by  doxygen 1.7.1