• Main Page
  • Related Pages
  • Modules
  • Data Structures
  • Files
  • Examples
  • File List
  • Globals

libavformat/matroskaenc.c

Go to the documentation of this file.
00001 /*
00002  * Matroska muxer
00003  * Copyright (c) 2007 David Conrad
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 
00022 #include "avformat.h"
00023 #include "riff.h"
00024 #include "isom.h"
00025 #include "matroska.h"
00026 #include "avc.h"
00027 #include "flacenc.h"
00028 #include "avlanguage.h"
00029 #include "libavutil/samplefmt.h"
00030 #include "libavutil/intreadwrite.h"
00031 #include "libavutil/random_seed.h"
00032 #include "libavutil/lfg.h"
00033 #include "libavutil/dict.h"
00034 #include "libavcodec/xiph.h"
00035 #include "libavcodec/mpeg4audio.h"
00036 #include <strings.h>
00037 
00038 typedef struct ebml_master {
00039     int64_t         pos;                
00040     int             sizebytes;          
00041 } ebml_master;
00042 
00043 typedef struct mkv_seekhead_entry {
00044     unsigned int    elementid;
00045     uint64_t        segmentpos;
00046 } mkv_seekhead_entry;
00047 
00048 typedef struct mkv_seekhead {
00049     int64_t                 filepos;
00050     int64_t                 segment_offset;     
00051     int                     reserved_size;      
00052     int                     max_entries;
00053     mkv_seekhead_entry      *entries;
00054     int                     num_entries;
00055 } mkv_seekhead;
00056 
00057 typedef struct {
00058     uint64_t        pts;
00059     int             tracknum;
00060     int64_t         cluster_pos;        
00061 } mkv_cuepoint;
00062 
00063 typedef struct {
00064     int64_t         segment_offset;
00065     mkv_cuepoint    *entries;
00066     int             num_entries;
00067 } mkv_cues;
00068 
00069 typedef struct {
00070     int             write_dts;
00071 } mkv_track;
00072 
00073 #define MODE_MATROSKAv2 0x01
00074 #define MODE_WEBM       0x02
00075 
00076 typedef struct MatroskaMuxContext {
00077     int             mode;
00078     AVIOContext   *dyn_bc;
00079     ebml_master     segment;
00080     int64_t         segment_offset;
00081     ebml_master     cluster;
00082     int64_t         cluster_pos;        
00083     int64_t         cluster_pts;
00084     int64_t         duration_offset;
00085     int64_t         duration;
00086     mkv_seekhead    *main_seekhead;
00087     mkv_cues        *cues;
00088     mkv_track       *tracks;
00089 
00090     unsigned int    audio_buffer_size;
00091     AVPacket        cur_audio_pkt;
00092 } MatroskaMuxContext;
00093 
00094 
00097 #define MAX_SEEKENTRY_SIZE 21
00098 
00101 #define MAX_CUETRACKPOS_SIZE 22
00102 
00104 #define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
00105 
00106 
00107 static int ebml_id_size(unsigned int id)
00108 {
00109     return (av_log2(id+1)-1)/7+1;
00110 }
00111 
00112 static void put_ebml_id(AVIOContext *pb, unsigned int id)
00113 {
00114     int i = ebml_id_size(id);
00115     while (i--)
00116         avio_w8(pb, id >> (i*8));
00117 }
00118 
00124 static void put_ebml_size_unknown(AVIOContext *pb, int bytes)
00125 {
00126     assert(bytes <= 8);
00127     avio_w8(pb, 0x1ff >> bytes);
00128     while (--bytes)
00129         avio_w8(pb, 0xff);
00130 }
00131 
00135 static int ebml_num_size(uint64_t num)
00136 {
00137     int bytes = 1;
00138     while ((num+1) >> bytes*7) bytes++;
00139     return bytes;
00140 }
00141 
00148 static void put_ebml_num(AVIOContext *pb, uint64_t num, int bytes)
00149 {
00150     int i, needed_bytes = ebml_num_size(num);
00151 
00152     // sizes larger than this are currently undefined in EBML
00153     assert(num < (1ULL<<56)-1);
00154 
00155     if (bytes == 0)
00156         // don't care how many bytes are used, so use the min
00157         bytes = needed_bytes;
00158     // the bytes needed to write the given size would exceed the bytes
00159     // that we need to use, so write unknown size. This shouldn't happen.
00160     assert(bytes >= needed_bytes);
00161 
00162     num |= 1ULL << bytes*7;
00163     for (i = bytes - 1; i >= 0; i--)
00164         avio_w8(pb, num >> i*8);
00165 }
00166 
00167 static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val)
00168 {
00169     int i, bytes = 1;
00170     uint64_t tmp = val;
00171     while (tmp>>=8) bytes++;
00172 
00173     put_ebml_id(pb, elementid);
00174     put_ebml_num(pb, bytes, 0);
00175     for (i = bytes - 1; i >= 0; i--)
00176         avio_w8(pb, val >> i*8);
00177 }
00178 
00179 static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val)
00180 {
00181     put_ebml_id(pb, elementid);
00182     put_ebml_num(pb, 8, 0);
00183     avio_wb64(pb, av_dbl2int(val));
00184 }
00185 
00186 static void put_ebml_binary(AVIOContext *pb, unsigned int elementid,
00187                             const void *buf, int size)
00188 {
00189     put_ebml_id(pb, elementid);
00190     put_ebml_num(pb, size, 0);
00191     avio_write(pb, buf, size);
00192 }
00193 
00194 static void put_ebml_string(AVIOContext *pb, unsigned int elementid, const char *str)
00195 {
00196     put_ebml_binary(pb, elementid, str, strlen(str));
00197 }
00198 
00205 static void put_ebml_void(AVIOContext *pb, uint64_t size)
00206 {
00207     int64_t currentpos = avio_tell(pb);
00208 
00209     assert(size >= 2);
00210 
00211     put_ebml_id(pb, EBML_ID_VOID);
00212     // we need to subtract the length needed to store the size from the
00213     // size we need to reserve so 2 cases, we use 8 bytes to store the
00214     // size if possible, 1 byte otherwise
00215     if (size < 10)
00216         put_ebml_num(pb, size-1, 0);
00217     else
00218         put_ebml_num(pb, size-9, 8);
00219     while(avio_tell(pb) < currentpos + size)
00220         avio_w8(pb, 0);
00221 }
00222 
00223 static ebml_master start_ebml_master(AVIOContext *pb, unsigned int elementid, uint64_t expectedsize)
00224 {
00225     int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
00226     put_ebml_id(pb, elementid);
00227     put_ebml_size_unknown(pb, bytes);
00228     return (ebml_master){ avio_tell(pb), bytes };
00229 }
00230 
00231 static void end_ebml_master(AVIOContext *pb, ebml_master master)
00232 {
00233     int64_t pos = avio_tell(pb);
00234 
00235     if (avio_seek(pb, master.pos - master.sizebytes, SEEK_SET) < 0)
00236         return;
00237     put_ebml_num(pb, pos - master.pos, master.sizebytes);
00238     avio_seek(pb, pos, SEEK_SET);
00239 }
00240 
00241 static void put_xiph_size(AVIOContext *pb, int size)
00242 {
00243     int i;
00244     for (i = 0; i < size / 255; i++)
00245         avio_w8(pb, 255);
00246     avio_w8(pb, size % 255);
00247 }
00248 
00260 static mkv_seekhead * mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset, int numelements)
00261 {
00262     mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
00263     if (new_seekhead == NULL)
00264         return NULL;
00265 
00266     new_seekhead->segment_offset = segment_offset;
00267 
00268     if (numelements > 0) {
00269         new_seekhead->filepos = avio_tell(pb);
00270         // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
00271         // and size, and 3 bytes to guarantee that an EBML void element
00272         // will fit afterwards
00273         new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
00274         new_seekhead->max_entries = numelements;
00275         put_ebml_void(pb, new_seekhead->reserved_size);
00276     }
00277     return new_seekhead;
00278 }
00279 
00280 static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
00281 {
00282     mkv_seekhead_entry *entries = seekhead->entries;
00283 
00284     // don't store more elements than we reserved space for
00285     if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
00286         return -1;
00287 
00288     entries = av_realloc(entries, (seekhead->num_entries + 1) * sizeof(mkv_seekhead_entry));
00289     if (entries == NULL)
00290         return AVERROR(ENOMEM);
00291 
00292     entries[seekhead->num_entries  ].elementid = elementid;
00293     entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
00294 
00295     seekhead->entries = entries;
00296     return 0;
00297 }
00298 
00308 static int64_t mkv_write_seekhead(AVIOContext *pb, mkv_seekhead *seekhead)
00309 {
00310     ebml_master metaseek, seekentry;
00311     int64_t currentpos;
00312     int i;
00313 
00314     currentpos = avio_tell(pb);
00315 
00316     if (seekhead->reserved_size > 0)
00317         if (avio_seek(pb, seekhead->filepos, SEEK_SET) < 0)
00318             return -1;
00319 
00320     metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
00321     for (i = 0; i < seekhead->num_entries; i++) {
00322         mkv_seekhead_entry *entry = &seekhead->entries[i];
00323 
00324         seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
00325 
00326         put_ebml_id(pb, MATROSKA_ID_SEEKID);
00327         put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
00328         put_ebml_id(pb, entry->elementid);
00329 
00330         put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
00331         end_ebml_master(pb, seekentry);
00332     }
00333     end_ebml_master(pb, metaseek);
00334 
00335     if (seekhead->reserved_size > 0) {
00336         uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
00337         put_ebml_void(pb, remaining);
00338         avio_seek(pb, currentpos, SEEK_SET);
00339 
00340         currentpos = seekhead->filepos;
00341     }
00342     av_free(seekhead->entries);
00343     av_free(seekhead);
00344 
00345     return currentpos;
00346 }
00347 
00348 static mkv_cues * mkv_start_cues(int64_t segment_offset)
00349 {
00350     mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
00351     if (cues == NULL)
00352         return NULL;
00353 
00354     cues->segment_offset = segment_offset;
00355     return cues;
00356 }
00357 
00358 static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos)
00359 {
00360     mkv_cuepoint *entries = cues->entries;
00361 
00362     entries = av_realloc(entries, (cues->num_entries + 1) * sizeof(mkv_cuepoint));
00363     if (entries == NULL)
00364         return AVERROR(ENOMEM);
00365 
00366     if (ts < 0)
00367         return 0;
00368 
00369     entries[cues->num_entries  ].pts = ts;
00370     entries[cues->num_entries  ].tracknum = stream + 1;
00371     entries[cues->num_entries++].cluster_pos = cluster_pos - cues->segment_offset;
00372 
00373     cues->entries = entries;
00374     return 0;
00375 }
00376 
00377 static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, int num_tracks)
00378 {
00379     ebml_master cues_element;
00380     int64_t currentpos;
00381     int i, j;
00382 
00383     currentpos = avio_tell(pb);
00384     cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
00385 
00386     for (i = 0; i < cues->num_entries; i++) {
00387         ebml_master cuepoint, track_positions;
00388         mkv_cuepoint *entry = &cues->entries[i];
00389         uint64_t pts = entry->pts;
00390 
00391         cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
00392         put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
00393 
00394         // put all the entries from different tracks that have the exact same
00395         // timestamp into the same CuePoint
00396         for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
00397             track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
00398             put_ebml_uint(pb, MATROSKA_ID_CUETRACK          , entry[j].tracknum   );
00399             put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION, entry[j].cluster_pos);
00400             end_ebml_master(pb, track_positions);
00401         }
00402         i += j - 1;
00403         end_ebml_master(pb, cuepoint);
00404     }
00405     end_ebml_master(pb, cues_element);
00406 
00407     return currentpos;
00408 }
00409 
00410 static int put_xiph_codecpriv(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec)
00411 {
00412     uint8_t *header_start[3];
00413     int header_len[3];
00414     int first_header_size;
00415     int j;
00416 
00417     if (codec->codec_id == CODEC_ID_VORBIS)
00418         first_header_size = 30;
00419     else
00420         first_header_size = 42;
00421 
00422     if (ff_split_xiph_headers(codec->extradata, codec->extradata_size,
00423                               first_header_size, header_start, header_len) < 0) {
00424         av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
00425         return -1;
00426     }
00427 
00428     avio_w8(pb, 2);                    // number packets - 1
00429     for (j = 0; j < 2; j++) {
00430         put_xiph_size(pb, header_len[j]);
00431     }
00432     for (j = 0; j < 3; j++)
00433         avio_write(pb, header_start[j], header_len[j]);
00434 
00435     return 0;
00436 }
00437 
00438 static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
00439 {
00440     MPEG4AudioConfig mp4ac;
00441 
00442     if (ff_mpeg4audio_get_config(&mp4ac, codec->extradata, codec->extradata_size) < 0) {
00443         av_log(s, AV_LOG_WARNING, "Error parsing AAC extradata, unable to determine samplerate.\n");
00444         return;
00445     }
00446 
00447     *sample_rate        = mp4ac.sample_rate;
00448     *output_sample_rate = mp4ac.ext_sample_rate;
00449 }
00450 
00451 static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
00452 {
00453     AVIOContext *dyn_cp;
00454     uint8_t *codecpriv;
00455     int ret, codecpriv_size;
00456 
00457     ret = avio_open_dyn_buf(&dyn_cp);
00458     if(ret < 0)
00459         return ret;
00460 
00461     if (native_id) {
00462         if (codec->codec_id == CODEC_ID_VORBIS || codec->codec_id == CODEC_ID_THEORA)
00463             ret = put_xiph_codecpriv(s, dyn_cp, codec);
00464         else if (codec->codec_id == CODEC_ID_FLAC)
00465             ret = ff_flac_write_header(dyn_cp, codec, 1);
00466         else if (codec->codec_id == CODEC_ID_H264)
00467             ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
00468         else if (codec->extradata_size)
00469             avio_write(dyn_cp, codec->extradata, codec->extradata_size);
00470     } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00471         if (qt_id) {
00472             if (!codec->codec_tag)
00473                 codec->codec_tag = ff_codec_get_tag(codec_movvideo_tags, codec->codec_id);
00474             if (codec->extradata_size)
00475                 avio_write(dyn_cp, codec->extradata, codec->extradata_size);
00476         } else {
00477             if (!codec->codec_tag)
00478                 codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
00479             if (!codec->codec_tag) {
00480                 av_log(s, AV_LOG_ERROR, "No bmp codec ID found.\n");
00481                 ret = -1;
00482             }
00483 
00484             ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0);
00485         }
00486 
00487     } else if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
00488         unsigned int tag;
00489         tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
00490         if (!tag) {
00491             av_log(s, AV_LOG_ERROR, "No wav codec ID found.\n");
00492             ret = -1;
00493         }
00494         if (!codec->codec_tag)
00495             codec->codec_tag = tag;
00496 
00497         ff_put_wav_header(dyn_cp, codec);
00498     }
00499 
00500     codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
00501     if (codecpriv_size)
00502         put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
00503     av_free(codecpriv);
00504     return ret;
00505 }
00506 
00507 static int mkv_write_tracks(AVFormatContext *s)
00508 {
00509     MatroskaMuxContext *mkv = s->priv_data;
00510     AVIOContext *pb = s->pb;
00511     ebml_master tracks;
00512     int i, j, ret;
00513 
00514     ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
00515     if (ret < 0) return ret;
00516 
00517     tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
00518     for (i = 0; i < s->nb_streams; i++) {
00519         AVStream *st = s->streams[i];
00520         AVCodecContext *codec = st->codec;
00521         ebml_master subinfo, track;
00522         int native_id = 0;
00523         int qt_id = 0;
00524         int bit_depth = av_get_bits_per_sample(codec->codec_id);
00525         int sample_rate = codec->sample_rate;
00526         int output_sample_rate = 0;
00527         AVDictionaryEntry *tag;
00528 
00529         if (!bit_depth)
00530             bit_depth = av_get_bytes_per_sample(codec->sample_fmt) << 3;
00531 
00532         if (codec->codec_id == CODEC_ID_AAC)
00533             get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
00534 
00535         track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
00536         put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER     , i + 1);
00537         put_ebml_uint (pb, MATROSKA_ID_TRACKUID        , i + 1);
00538         put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0);    // no lacing (yet)
00539 
00540         if ((tag = av_dict_get(st->metadata, "title", NULL, 0)))
00541             put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
00542         tag = av_dict_get(st->metadata, "language", NULL, 0);
00543         put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
00544 
00545         if (st->disposition)
00546             put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
00547 
00548         // look for a codec ID string specific to mkv to use,
00549         // if none are found, use AVI codes
00550         for (j = 0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++) {
00551             if (ff_mkv_codec_tags[j].id == codec->codec_id) {
00552                 put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
00553                 native_id = 1;
00554                 break;
00555             }
00556         }
00557 
00558         if (mkv->mode == MODE_WEBM && !(codec->codec_id == CODEC_ID_VP8 ||
00559                                         codec->codec_id == CODEC_ID_VORBIS)) {
00560             av_log(s, AV_LOG_ERROR,
00561                    "Only VP8 video and Vorbis audio are supported for WebM.\n");
00562             return AVERROR(EINVAL);
00563         }
00564 
00565         switch (codec->codec_type) {
00566             case AVMEDIA_TYPE_VIDEO:
00567                 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
00568                 put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, av_q2d(codec->time_base)*1E9);
00569 
00570                 if (!native_id &&
00571                       ff_codec_get_tag(codec_movvideo_tags, codec->codec_id) &&
00572                     (!ff_codec_get_tag(ff_codec_bmp_tags,   codec->codec_id)
00573                      || codec->codec_id == CODEC_ID_SVQ1
00574                      || codec->codec_id == CODEC_ID_SVQ3
00575                      || codec->codec_id == CODEC_ID_CINEPAK))
00576                     qt_id = 1;
00577 
00578                 if (qt_id)
00579                     put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
00580                 else if (!native_id) {
00581                     // if there is no mkv-specific codec ID, use VFW mode
00582                     put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
00583                     mkv->tracks[i].write_dts = 1;
00584                 }
00585 
00586                 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
00587                 // XXX: interlace flag?
00588                 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
00589                 put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
00590 
00591                 if ((tag = av_dict_get(st->metadata, "stereo_mode", NULL, 0)) ||
00592                     (tag = av_dict_get( s->metadata, "stereo_mode", NULL, 0))) {
00593                     // save stereo mode flag
00594                     uint64_t st_mode = MATROSKA_VIDEO_STEREO_MODE_COUNT;
00595 
00596                     for (j=0; j<MATROSKA_VIDEO_STEREO_MODE_COUNT; j++)
00597                         if (!strcmp(tag->value, matroska_video_stereo_mode[j])){
00598                             st_mode = j;
00599                             break;
00600                         }
00601 
00602                     if ((mkv->mode == MODE_WEBM && st_mode > 3 && st_mode != 11)
00603                         || st_mode >= MATROSKA_VIDEO_STEREO_MODE_COUNT) {
00604                         av_log(s, AV_LOG_ERROR,
00605                                "The specified stereo mode is not valid.\n");
00606                         return AVERROR(EINVAL);
00607                     } else
00608                         put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, st_mode);
00609                 }
00610 
00611                 if (st->sample_aspect_ratio.num) {
00612                     int d_width = codec->width*av_q2d(st->sample_aspect_ratio);
00613                     put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width);
00614                     put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height);
00615                     put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYUNIT, 3);
00616                 }
00617 
00618                 if (codec->codec_id == CODEC_ID_RAWVIDEO) {
00619                     uint32_t color_space = av_le2ne32(codec->codec_tag);
00620                     put_ebml_binary(pb, MATROSKA_ID_VIDEOCOLORSPACE, &color_space, sizeof(color_space));
00621                 }
00622                 end_ebml_master(pb, subinfo);
00623                 break;
00624 
00625             case AVMEDIA_TYPE_AUDIO:
00626                 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
00627 
00628                 if (!native_id)
00629                     // no mkv-specific ID, use ACM mode
00630                     put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
00631 
00632                 subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
00633                 put_ebml_uint  (pb, MATROSKA_ID_AUDIOCHANNELS    , codec->channels);
00634                 put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
00635                 if (output_sample_rate)
00636                     put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
00637                 if (bit_depth)
00638                     put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
00639                 end_ebml_master(pb, subinfo);
00640                 break;
00641 
00642             case AVMEDIA_TYPE_SUBTITLE:
00643                 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_SUBTITLE);
00644                 if (!native_id) {
00645                     av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", codec->codec_id);
00646                     return AVERROR(ENOSYS);
00647                 }
00648                 break;
00649             default:
00650                 av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.\n");
00651                 break;
00652         }
00653         ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
00654         if (ret < 0) return ret;
00655 
00656         end_ebml_master(pb, track);
00657 
00658         // ms precision is the de-facto standard timescale for mkv files
00659         av_set_pts_info(st, 64, 1, 1000);
00660     }
00661     end_ebml_master(pb, tracks);
00662     return 0;
00663 }
00664 
00665 static int mkv_write_chapters(AVFormatContext *s)
00666 {
00667     MatroskaMuxContext *mkv = s->priv_data;
00668     AVIOContext *pb = s->pb;
00669     ebml_master chapters, editionentry;
00670     AVRational scale = {1, 1E9};
00671     int i, ret;
00672 
00673     if (!s->nb_chapters)
00674         return 0;
00675 
00676     ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
00677     if (ret < 0) return ret;
00678 
00679     chapters     = start_ebml_master(pb, MATROSKA_ID_CHAPTERS    , 0);
00680     editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
00681     put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
00682     put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
00683     for (i = 0; i < s->nb_chapters; i++) {
00684         ebml_master chapteratom, chapterdisplay;
00685         AVChapter *c     = s->chapters[i];
00686         AVDictionaryEntry *t = NULL;
00687 
00688         chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
00689         put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id);
00690         put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
00691                       av_rescale_q(c->start, c->time_base, scale));
00692         put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
00693                       av_rescale_q(c->end,   c->time_base, scale));
00694         put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
00695         put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
00696         if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {
00697             chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
00698             put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
00699             put_ebml_string(pb, MATROSKA_ID_CHAPLANG  , "und");
00700             end_ebml_master(pb, chapterdisplay);
00701         }
00702         end_ebml_master(pb, chapteratom);
00703     }
00704     end_ebml_master(pb, editionentry);
00705     end_ebml_master(pb, chapters);
00706     return 0;
00707 }
00708 
00709 static void mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
00710 {
00711     uint8_t *key = av_strdup(t->key);
00712     uint8_t *p   = key;
00713     const uint8_t *lang = NULL;
00714     ebml_master tag;
00715 
00716     if ((p = strrchr(p, '-')) &&
00717         (lang = av_convert_lang_to(p + 1, AV_LANG_ISO639_2_BIBL)))
00718         *p = 0;
00719 
00720     p = key;
00721     while (*p) {
00722         if (*p == ' ')
00723             *p = '_';
00724         else if (*p >= 'a' && *p <= 'z')
00725             *p -= 'a' - 'A';
00726         p++;
00727     }
00728 
00729     tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
00730     put_ebml_string(pb, MATROSKA_ID_TAGNAME, key);
00731     if (lang)
00732         put_ebml_string(pb, MATROSKA_ID_TAGLANG, lang);
00733     put_ebml_string(pb, MATROSKA_ID_TAGSTRING, t->value);
00734     end_ebml_master(pb, tag);
00735 
00736     av_freep(&key);
00737 }
00738 
00739 static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, unsigned int elementid,
00740                          unsigned int uid, ebml_master *tags)
00741 {
00742     MatroskaMuxContext *mkv = s->priv_data;
00743     ebml_master tag, targets;
00744     AVDictionaryEntry *t = NULL;
00745     int ret;
00746 
00747     if (!tags->pos) {
00748         ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
00749         if (ret < 0) return ret;
00750 
00751         *tags = start_ebml_master(s->pb, MATROSKA_ID_TAGS, 0);
00752     }
00753 
00754     tag     = start_ebml_master(s->pb, MATROSKA_ID_TAG,        0);
00755     targets = start_ebml_master(s->pb, MATROSKA_ID_TAGTARGETS, 0);
00756     if (elementid)
00757         put_ebml_uint(s->pb, elementid, uid);
00758     end_ebml_master(s->pb, targets);
00759 
00760     while ((t = av_dict_get(m, "", t, AV_DICT_IGNORE_SUFFIX)))
00761         if (strcasecmp(t->key, "title") && strcasecmp(t->key, "stereo_mode"))
00762             mkv_write_simpletag(s->pb, t);
00763 
00764     end_ebml_master(s->pb, tag);
00765     return 0;
00766 }
00767 
00768 static int mkv_write_tags(AVFormatContext *s)
00769 {
00770     ebml_master tags = {0};
00771     int i, ret;
00772 
00773     ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);
00774 
00775     if (av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
00776         ret = mkv_write_tag(s, s->metadata, 0, 0, &tags);
00777         if (ret < 0) return ret;
00778     }
00779 
00780     for (i = 0; i < s->nb_streams; i++) {
00781         AVStream *st = s->streams[i];
00782 
00783         if (!av_dict_get(st->metadata, "", 0, AV_DICT_IGNORE_SUFFIX))
00784             continue;
00785 
00786         ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tags);
00787         if (ret < 0) return ret;
00788     }
00789 
00790     for (i = 0; i < s->nb_chapters; i++) {
00791         AVChapter *ch = s->chapters[i];
00792 
00793         if (!av_dict_get(ch->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
00794             continue;
00795 
00796         ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id, &tags);
00797         if (ret < 0) return ret;
00798     }
00799 
00800     if (tags.pos)
00801         end_ebml_master(s->pb, tags);
00802     return 0;
00803 }
00804 
00805 static int mkv_write_header(AVFormatContext *s)
00806 {
00807     MatroskaMuxContext *mkv = s->priv_data;
00808     AVIOContext *pb = s->pb;
00809     ebml_master ebml_header, segment_info;
00810     AVDictionaryEntry *tag;
00811     int ret, i;
00812 
00813     if (!strcmp(s->oformat->name, "webm")) mkv->mode = MODE_WEBM;
00814     else                                   mkv->mode = MODE_MATROSKAv2;
00815 
00816     mkv->tracks = av_mallocz(s->nb_streams * sizeof(*mkv->tracks));
00817     if (!mkv->tracks)
00818         return AVERROR(ENOMEM);
00819 
00820     ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
00821     put_ebml_uint   (pb, EBML_ID_EBMLVERSION        ,           1);
00822     put_ebml_uint   (pb, EBML_ID_EBMLREADVERSION    ,           1);
00823     put_ebml_uint   (pb, EBML_ID_EBMLMAXIDLENGTH    ,           4);
00824     put_ebml_uint   (pb, EBML_ID_EBMLMAXSIZELENGTH  ,           8);
00825     put_ebml_string (pb, EBML_ID_DOCTYPE            , s->oformat->name);
00826     put_ebml_uint   (pb, EBML_ID_DOCTYPEVERSION     ,           2);
00827     put_ebml_uint   (pb, EBML_ID_DOCTYPEREADVERSION ,           2);
00828     end_ebml_master(pb, ebml_header);
00829 
00830     mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
00831     mkv->segment_offset = avio_tell(pb);
00832 
00833     // we write 2 seek heads - one at the end of the file to point to each
00834     // cluster, and one at the beginning to point to all other level one
00835     // elements (including the seek head at the end of the file), which
00836     // isn't more than 10 elements if we only write one of each other
00837     // currently defined level 1 element
00838     mkv->main_seekhead    = mkv_start_seekhead(pb, mkv->segment_offset, 10);
00839     if (!mkv->main_seekhead)
00840         return AVERROR(ENOMEM);
00841 
00842     ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, avio_tell(pb));
00843     if (ret < 0) return ret;
00844 
00845     segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
00846     put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
00847     if ((tag = av_dict_get(s->metadata, "title", NULL, 0)))
00848         put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
00849     if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
00850         uint32_t segment_uid[4];
00851         AVLFG lfg;
00852 
00853         av_lfg_init(&lfg, av_get_random_seed());
00854 
00855         for (i = 0; i < 4; i++)
00856             segment_uid[i] = av_lfg_get(&lfg);
00857 
00858         put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
00859         put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
00860         put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
00861     }
00862 
00863     // reserve space for the duration
00864     mkv->duration = 0;
00865     mkv->duration_offset = avio_tell(pb);
00866     put_ebml_void(pb, 11);                  // assumes double-precision float to be written
00867     end_ebml_master(pb, segment_info);
00868 
00869     ret = mkv_write_tracks(s);
00870     if (ret < 0) return ret;
00871 
00872     if (mkv->mode != MODE_WEBM) {
00873         ret = mkv_write_chapters(s);
00874         if (ret < 0) return ret;
00875 
00876         ret = mkv_write_tags(s);
00877         if (ret < 0) return ret;
00878     }
00879 
00880     if (!s->pb->seekable)
00881         mkv_write_seekhead(pb, mkv->main_seekhead);
00882 
00883     mkv->cues = mkv_start_cues(mkv->segment_offset);
00884     if (mkv->cues == NULL)
00885         return AVERROR(ENOMEM);
00886 
00887     av_init_packet(&mkv->cur_audio_pkt);
00888     mkv->cur_audio_pkt.size = 0;
00889     mkv->audio_buffer_size  = 0;
00890 
00891     avio_flush(pb);
00892     return 0;
00893 }
00894 
00895 static int mkv_blockgroup_size(int pkt_size)
00896 {
00897     int size = pkt_size + 4;
00898     size += ebml_num_size(size);
00899     size += 2;              // EBML ID for block and block duration
00900     size += 8;              // max size of block duration
00901     size += ebml_num_size(size);
00902     size += 1;              // blockgroup EBML ID
00903     return size;
00904 }
00905 
00906 static int ass_get_duration(const uint8_t *p)
00907 {
00908     int sh, sm, ss, sc, eh, em, es, ec;
00909     uint64_t start, end;
00910 
00911     if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
00912                &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
00913         return 0;
00914     start = 3600000*sh + 60000*sm + 1000*ss + 10*sc;
00915     end   = 3600000*eh + 60000*em + 1000*es + 10*ec;
00916     return end - start;
00917 }
00918 
00919 static int mkv_write_ass_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
00920 {
00921     MatroskaMuxContext *mkv = s->priv_data;
00922     int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
00923     uint8_t *start, *end, *data = pkt->data;
00924     ebml_master blockgroup;
00925     char buffer[2048];
00926 
00927     while (data_size) {
00928         int duration = ass_get_duration(data);
00929         max_duration = FFMAX(duration, max_duration);
00930         end = memchr(data, '\n', data_size);
00931         size = line_size = end ? end-data+1 : data_size;
00932         size -= end ? (end[-1]=='\r')+1 : 0;
00933         start = data;
00934         for (i=0; i<3; i++, start++)
00935             if (!(start = memchr(start, ',', size-(start-data))))
00936                 return max_duration;
00937         size -= start - data;
00938         sscanf(data, "Dialogue: %d,", &layer);
00939         i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
00940                      s->streams[pkt->stream_index]->nb_frames++, layer);
00941         size = FFMIN(i+size, sizeof(buffer));
00942         memcpy(buffer+i, start, size-i);
00943 
00944         av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
00945                "pts %" PRId64 ", duration %d\n",
00946                avio_tell(pb), size, pkt->pts, duration);
00947         blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
00948         put_ebml_id(pb, MATROSKA_ID_BLOCK);
00949         put_ebml_num(pb, size+4, 0);
00950         avio_w8(pb, 0x80 | (pkt->stream_index + 1));     // this assumes stream_index is less than 126
00951         avio_wb16(pb, pkt->pts - mkv->cluster_pts);
00952         avio_w8(pb, 0);
00953         avio_write(pb, buffer, size);
00954         put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
00955         end_ebml_master(pb, blockgroup);
00956 
00957         data += line_size;
00958         data_size -= line_size;
00959     }
00960 
00961     return max_duration;
00962 }
00963 
00964 static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
00965                             unsigned int blockid, AVPacket *pkt, int flags)
00966 {
00967     MatroskaMuxContext *mkv = s->priv_data;
00968     AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
00969     uint8_t *data = NULL;
00970     int size = pkt->size;
00971     int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
00972 
00973     av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
00974            "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
00975            avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
00976     if (codec->codec_id == CODEC_ID_H264 && codec->extradata_size > 0 &&
00977         (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
00978         ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
00979     else
00980         data = pkt->data;
00981     put_ebml_id(pb, blockid);
00982     put_ebml_num(pb, size+4, 0);
00983     avio_w8(pb, 0x80 | (pkt->stream_index + 1));     // this assumes stream_index is less than 126
00984     avio_wb16(pb, ts - mkv->cluster_pts);
00985     avio_w8(pb, flags);
00986     avio_write(pb, data, size);
00987     if (data != pkt->data)
00988         av_free(data);
00989 }
00990 
00991 static int srt_get_duration(uint8_t **buf)
00992 {
00993     int i, duration = 0;
00994 
00995     for (i=0; i<2 && !duration; i++) {
00996         int s_hour, s_min, s_sec, s_hsec, e_hour, e_min, e_sec, e_hsec;
00997         if (sscanf(*buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d",
00998                    &s_hour, &s_min, &s_sec, &s_hsec,
00999                    &e_hour, &e_min, &e_sec, &e_hsec) == 8) {
01000             s_min  +=   60*s_hour;      e_min  +=   60*e_hour;
01001             s_sec  +=   60*s_min;       e_sec  +=   60*e_min;
01002             s_hsec += 1000*s_sec;       e_hsec += 1000*e_sec;
01003             duration = e_hsec - s_hsec;
01004         }
01005         *buf += strcspn(*buf, "\n") + 1;
01006     }
01007     return duration;
01008 }
01009 
01010 static int mkv_write_srt_blocks(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
01011 {
01012     ebml_master blockgroup;
01013     AVPacket pkt2 = *pkt;
01014     int64_t duration = srt_get_duration(&pkt2.data);
01015     pkt2.size -= pkt2.data - pkt->data;
01016 
01017     blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP,
01018                                    mkv_blockgroup_size(pkt2.size));
01019     mkv_write_block(s, pb, MATROSKA_ID_BLOCK, &pkt2, 0);
01020     put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
01021     end_ebml_master(pb, blockgroup);
01022 
01023     return duration;
01024 }
01025 
01026 static void mkv_flush_dynbuf(AVFormatContext *s)
01027 {
01028     MatroskaMuxContext *mkv = s->priv_data;
01029     int bufsize;
01030     uint8_t *dyn_buf;
01031 
01032     if (!mkv->dyn_bc)
01033         return;
01034 
01035     bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
01036     avio_write(s->pb, dyn_buf, bufsize);
01037     av_free(dyn_buf);
01038     mkv->dyn_bc = NULL;
01039 }
01040 
01041 static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
01042 {
01043     MatroskaMuxContext *mkv = s->priv_data;
01044     AVIOContext *pb = s->pb;
01045     AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
01046     int keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
01047     int duration = pkt->duration;
01048     int ret;
01049     int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
01050 
01051     if (ts == AV_NOPTS_VALUE) {
01052         av_log(s, AV_LOG_ERROR, "Can't write packet with unknown timestamp\n");
01053         return AVERROR(EINVAL);
01054     }
01055 
01056     if (!s->pb->seekable) {
01057         if (!mkv->dyn_bc)
01058             avio_open_dyn_buf(&mkv->dyn_bc);
01059         pb = mkv->dyn_bc;
01060     }
01061 
01062     if (!mkv->cluster_pos) {
01063         mkv->cluster_pos = avio_tell(s->pb);
01064         mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
01065         put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
01066         mkv->cluster_pts = FFMAX(0, ts);
01067     }
01068 
01069     if (codec->codec_type != AVMEDIA_TYPE_SUBTITLE) {
01070         mkv_write_block(s, pb, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
01071     } else if (codec->codec_id == CODEC_ID_SSA) {
01072         duration = mkv_write_ass_blocks(s, pb, pkt);
01073     } else if (codec->codec_id == CODEC_ID_SRT) {
01074         duration = mkv_write_srt_blocks(s, pb, pkt);
01075     } else {
01076         ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
01077         duration = pkt->convergence_duration;
01078         mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
01079         put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
01080         end_ebml_master(pb, blockgroup);
01081     }
01082 
01083     if (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) {
01084         ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts, mkv->cluster_pos);
01085         if (ret < 0) return ret;
01086     }
01087 
01088     mkv->duration = FFMAX(mkv->duration, ts + duration);
01089     return 0;
01090 }
01091 
01092 static int mkv_copy_packet(MatroskaMuxContext *mkv, const AVPacket *pkt)
01093 {
01094     uint8_t *data           = mkv->cur_audio_pkt.data;
01095     mkv->cur_audio_pkt      = *pkt;
01096     mkv->cur_audio_pkt.data = av_fast_realloc(data, &mkv->audio_buffer_size, pkt->size);
01097     if (!mkv->cur_audio_pkt.data)
01098         return AVERROR(ENOMEM);
01099 
01100     memcpy(mkv->cur_audio_pkt.data, pkt->data, pkt->size);
01101     mkv->cur_audio_pkt.size = pkt->size;
01102     return 0;
01103 }
01104 
01105 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
01106 {
01107     MatroskaMuxContext *mkv = s->priv_data;
01108     AVIOContext *pb = s->pb->seekable ? s->pb : mkv->dyn_bc;
01109     AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
01110     int ret, keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
01111     int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
01112     int cluster_size = avio_tell(pb) - (s->pb->seekable ? mkv->cluster_pos : 0);
01113 
01114     // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
01115     // after 4k and on a keyframe
01116     if (mkv->cluster_pos &&
01117         ((!s->pb->seekable && (cluster_size > 32*1024 || ts > mkv->cluster_pts + 1000))
01118          ||                      cluster_size > 5*1024*1024 || ts > mkv->cluster_pts + 5000
01119          || (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe && cluster_size > 4*1024))) {
01120         av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
01121                " bytes, pts %" PRIu64 "\n", avio_tell(pb), ts);
01122         end_ebml_master(pb, mkv->cluster);
01123         mkv->cluster_pos = 0;
01124         if (mkv->dyn_bc)
01125             mkv_flush_dynbuf(s);
01126     }
01127 
01128     // check if we have an audio packet cached
01129     if (mkv->cur_audio_pkt.size > 0) {
01130         ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
01131         mkv->cur_audio_pkt.size = 0;
01132         if (ret < 0) {
01133             av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
01134             return ret;
01135         }
01136     }
01137 
01138     // buffer an audio packet to ensure the packet containing the video
01139     // keyframe's timecode is contained in the same cluster for WebM
01140     if (codec->codec_type == AVMEDIA_TYPE_AUDIO)
01141         ret = mkv_copy_packet(mkv, pkt);
01142     else
01143         ret = mkv_write_packet_internal(s, pkt);
01144     return ret;
01145 }
01146 
01147 static int mkv_write_trailer(AVFormatContext *s)
01148 {
01149     MatroskaMuxContext *mkv = s->priv_data;
01150     AVIOContext *pb = s->pb;
01151     int64_t currentpos, cuespos;
01152     int ret;
01153 
01154     // check if we have an audio packet cached
01155     if (mkv->cur_audio_pkt.size > 0) {
01156         ret = mkv_write_packet_internal(s, &mkv->cur_audio_pkt);
01157         mkv->cur_audio_pkt.size = 0;
01158         if (ret < 0) {
01159             av_log(s, AV_LOG_ERROR, "Could not write cached audio packet ret:%d\n", ret);
01160             return ret;
01161         }
01162     }
01163 
01164     if (mkv->dyn_bc) {
01165         end_ebml_master(mkv->dyn_bc, mkv->cluster);
01166         mkv_flush_dynbuf(s);
01167     } else if (mkv->cluster_pos) {
01168         end_ebml_master(pb, mkv->cluster);
01169     }
01170 
01171     if (pb->seekable) {
01172         if (mkv->cues->num_entries) {
01173             cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
01174 
01175             ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES, cuespos);
01176             if (ret < 0) return ret;
01177         }
01178 
01179         mkv_write_seekhead(pb, mkv->main_seekhead);
01180 
01181         // update the duration
01182         av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
01183         currentpos = avio_tell(pb);
01184         avio_seek(pb, mkv->duration_offset, SEEK_SET);
01185         put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
01186 
01187         avio_seek(pb, currentpos, SEEK_SET);
01188     }
01189 
01190     end_ebml_master(pb, mkv->segment);
01191     av_free(mkv->tracks);
01192     av_freep(&mkv->cues->entries);
01193     av_freep(&mkv->cues);
01194     av_destruct_packet(&mkv->cur_audio_pkt);
01195     avio_flush(pb);
01196     return 0;
01197 }
01198 
01199 #if CONFIG_MATROSKA_MUXER
01200 AVOutputFormat ff_matroska_muxer = {
01201     "matroska",
01202     NULL_IF_CONFIG_SMALL("Matroska file format"),
01203     "video/x-matroska",
01204     "mkv",
01205     sizeof(MatroskaMuxContext),
01206     CODEC_ID_MP2,
01207     CODEC_ID_MPEG4,
01208     mkv_write_header,
01209     mkv_write_packet,
01210     mkv_write_trailer,
01211     .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
01212     .subtitle_codec = CODEC_ID_TEXT,
01213 };
01214 #endif
01215 
01216 #if CONFIG_WEBM_MUXER
01217 AVOutputFormat ff_webm_muxer = {
01218     "webm",
01219     NULL_IF_CONFIG_SMALL("WebM file format"),
01220     "video/webm",
01221     "webm",
01222     sizeof(MatroskaMuxContext),
01223     CODEC_ID_VORBIS,
01224     CODEC_ID_VP8,
01225     mkv_write_header,
01226     mkv_write_packet,
01227     mkv_write_trailer,
01228     .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT,
01229 };
01230 #endif
01231 
01232 #if CONFIG_MATROSKA_AUDIO_MUXER
01233 AVOutputFormat ff_matroska_audio_muxer = {
01234     "matroska",
01235     NULL_IF_CONFIG_SMALL("Matroska file format"),
01236     "audio/x-matroska",
01237     "mka",
01238     sizeof(MatroskaMuxContext),
01239     CODEC_ID_MP2,
01240     CODEC_ID_NONE,
01241     mkv_write_header,
01242     mkv_write_packet,
01243     mkv_write_trailer,
01244     .flags = AVFMT_GLOBALHEADER,
01245 };
01246 #endif

Generated on Wed Apr 11 2012 07:31:36 for FFmpeg by  doxygen 1.7.1