FFmpeg: libavformat/flvenc.c Source File

00001 /*
00002  * FLV muxer
00003  * Copyright (c) 2003 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 
00022 #include "libavutil/intreadwrite.h"
00023 #include "libavutil/dict.h"
00024 #include "libavutil/intfloat.h"
00025 #include "libavutil/avassert.h"
00026 #include "avc.h"
00027 #include "avformat.h"
00028 #include "flv.h"
00029 #include "internal.h"
00030 #include "metadata.h"
00031 
00032 
00033 static const AVCodecTag flv_video_codec_ids[] = {
00034     { AV_CODEC_ID_FLV1,     FLV_CODECID_H263 },
00035     { AV_CODEC_ID_H263,     FLV_CODECID_REALH263 },
00036     { AV_CODEC_ID_MPEG4,    FLV_CODECID_MPEG4 },
00037     { AV_CODEC_ID_FLASHSV,  FLV_CODECID_SCREEN },
00038     { AV_CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2 },
00039     { AV_CODEC_ID_VP6F,     FLV_CODECID_VP6 },
00040     { AV_CODEC_ID_VP6,      FLV_CODECID_VP6 },
00041     { AV_CODEC_ID_VP6A,     FLV_CODECID_VP6A },
00042     { AV_CODEC_ID_H264,     FLV_CODECID_H264 },
00043     { AV_CODEC_ID_NONE,     0 }
00044 };
00045 
00046 static const AVCodecTag flv_audio_codec_ids[] = {
00047     { AV_CODEC_ID_MP3,        FLV_CODECID_MP3        >> FLV_AUDIO_CODECID_OFFSET },
00048     { AV_CODEC_ID_PCM_U8,     FLV_CODECID_PCM        >> FLV_AUDIO_CODECID_OFFSET },
00049     { AV_CODEC_ID_PCM_S16BE,  FLV_CODECID_PCM        >> FLV_AUDIO_CODECID_OFFSET },
00050     { AV_CODEC_ID_PCM_S16LE,  FLV_CODECID_PCM_LE     >> FLV_AUDIO_CODECID_OFFSET },
00051     { AV_CODEC_ID_ADPCM_SWF,  FLV_CODECID_ADPCM      >> FLV_AUDIO_CODECID_OFFSET },
00052     { AV_CODEC_ID_AAC,        FLV_CODECID_AAC        >> FLV_AUDIO_CODECID_OFFSET },
00053     { AV_CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET },
00054     { AV_CODEC_ID_PCM_MULAW,  FLV_CODECID_PCM_MULAW  >> FLV_AUDIO_CODECID_OFFSET },
00055     { AV_CODEC_ID_PCM_ALAW,   FLV_CODECID_PCM_ALAW   >> FLV_AUDIO_CODECID_OFFSET },
00056     { AV_CODEC_ID_SPEEX,      FLV_CODECID_SPEEX      >> FLV_AUDIO_CODECID_OFFSET },
00057     { AV_CODEC_ID_NONE,       0 }
00058 };
00059 
00060 typedef struct FLVContext {
00061     int     reserved;
00062     int64_t duration_offset;
00063     int64_t filesize_offset;
00064     int64_t duration;
00065     int64_t delay;      
00066 } FLVContext;
00067 
00068 typedef struct FLVStreamContext {
00069     int64_t last_ts;    
00070 } FLVStreamContext;
00071 
00072 static int get_audio_flags(AVFormatContext *s, AVCodecContext *enc)
00073 {
00074     int flags = (enc->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT
00075                                                    : FLV_SAMPLESSIZE_8BIT;
00076 
00077     if (enc->codec_id == AV_CODEC_ID_AAC) // specs force these parameters
00078         return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ |
00079                FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
00080     else if (enc->codec_id == AV_CODEC_ID_SPEEX) {
00081         if (enc->sample_rate != 16000) {
00082             av_log(s, AV_LOG_ERROR,
00083                    "FLV only supports wideband (16kHz) Speex audio\n");
00084             return AVERROR(EINVAL);
00085         }
00086         if (enc->channels != 1) {
00087             av_log(s, AV_LOG_ERROR, "FLV only supports mono Speex audio\n");
00088             return AVERROR(EINVAL);
00089         }
00090         return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;
00091     } else {
00092         switch (enc->sample_rate) {
00093         case 44100:
00094             flags |= FLV_SAMPLERATE_44100HZ;
00095             break;
00096         case 22050:
00097             flags |= FLV_SAMPLERATE_22050HZ;
00098             break;
00099         case 11025:
00100             flags |= FLV_SAMPLERATE_11025HZ;
00101             break;
00102         case 16000: // nellymoser only
00103         case  8000: // nellymoser only
00104         case  5512: // not MP3
00105             if (enc->codec_id != AV_CODEC_ID_MP3) {
00106                 flags |= FLV_SAMPLERATE_SPECIAL;
00107                 break;
00108             }
00109         default:
00110             av_log(s, AV_LOG_ERROR,
00111                    "FLV does not support sample rate %d, "
00112                    "choose from (44100, 22050, 11025)\n", enc->sample_rate);
00113             return AVERROR(EINVAL);
00114         }
00115     }
00116 
00117     if (enc->channels > 1)
00118         flags |= FLV_STEREO;
00119 
00120     switch (enc->codec_id) {
00121     case AV_CODEC_ID_MP3:
00122         flags |= FLV_CODECID_MP3    | FLV_SAMPLESSIZE_16BIT;
00123         break;
00124     case AV_CODEC_ID_PCM_U8:
00125         flags |= FLV_CODECID_PCM    | FLV_SAMPLESSIZE_8BIT;
00126         break;
00127     case AV_CODEC_ID_PCM_S16BE:
00128         flags |= FLV_CODECID_PCM    | FLV_SAMPLESSIZE_16BIT;
00129         break;
00130     case AV_CODEC_ID_PCM_S16LE:
00131         flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
00132         break;
00133     case AV_CODEC_ID_ADPCM_SWF:
00134         flags |= FLV_CODECID_ADPCM  | FLV_SAMPLESSIZE_16BIT;
00135         break;
00136     case AV_CODEC_ID_NELLYMOSER:
00137         if (enc->sample_rate == 8000)
00138             flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO  | FLV_SAMPLESSIZE_16BIT;
00139         else if (enc->sample_rate == 16000)
00140             flags |= FLV_CODECID_NELLYMOSER_16KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
00141         else
00142             flags |= FLV_CODECID_NELLYMOSER            | FLV_SAMPLESSIZE_16BIT;
00143         break;
00144     case AV_CODEC_ID_PCM_MULAW:
00145         flags = FLV_CODECID_PCM_MULAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
00146         break;
00147     case AV_CODEC_ID_PCM_ALAW:
00148         flags = FLV_CODECID_PCM_ALAW  | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
00149         break;
00150     case 0:
00151         flags |= enc->codec_tag << 4;
00152         break;
00153     default:
00154         av_log(s, AV_LOG_ERROR, "Audio codec '%s' not compatible with FLV\n",
00155                avcodec_get_name(enc->codec_id));
00156         return AVERROR(EINVAL);
00157     }
00158 
00159     return flags;
00160 }
00161 
00162 static void put_amf_string(AVIOContext *pb, const char *str)
00163 {
00164     size_t len = strlen(str);
00165     avio_wb16(pb, len);
00166     avio_write(pb, str, len);
00167 }
00168 
00169 static void put_avc_eos_tag(AVIOContext *pb, unsigned ts)
00170 {
00171     avio_w8(pb, FLV_TAG_TYPE_VIDEO);
00172     avio_wb24(pb, 5);               /* Tag Data Size */
00173     avio_wb24(pb, ts);              /* lower 24 bits of timestamp in ms */
00174     avio_w8(pb, (ts >> 24) & 0x7F); /* MSB of ts in ms */
00175     avio_wb24(pb, 0);               /* StreamId = 0 */
00176     avio_w8(pb, 23);                /* ub[4] FrameType = 1, ub[4] CodecId = 7 */
00177     avio_w8(pb, 2);                 /* AVC end of sequence */
00178     avio_wb24(pb, 0);               /* Always 0 for AVC EOS. */
00179     avio_wb32(pb, 16);              /* Size of FLV tag */
00180 }
00181 
00182 static void put_amf_double(AVIOContext *pb, double d)
00183 {
00184     avio_w8(pb, AMF_DATA_TYPE_NUMBER);
00185     avio_wb64(pb, av_double2int(d));
00186 }
00187 
00188 static void put_amf_bool(AVIOContext *pb, int b)
00189 {
00190     avio_w8(pb, AMF_DATA_TYPE_BOOL);
00191     avio_w8(pb, !!b);
00192 }
00193 
00194 static int flv_write_header(AVFormatContext *s)
00195 {
00196     AVIOContext *pb = s->pb;
00197     FLVContext *flv = s->priv_data;
00198     AVCodecContext *audio_enc = NULL, *video_enc = NULL, *data_enc = NULL;
00199     int i, metadata_count = 0;
00200     double framerate = 0.0;
00201     int64_t metadata_size_pos, data_size, metadata_count_pos;
00202     AVDictionaryEntry *tag = NULL;
00203 
00204     for (i = 0; i < s->nb_streams; i++) {
00205         AVCodecContext *enc = s->streams[i]->codec;
00206         FLVStreamContext *sc;
00207         switch (enc->codec_type) {
00208         case AVMEDIA_TYPE_VIDEO:
00209             if (s->streams[i]->avg_frame_rate.den &&
00210                 s->streams[i]->avg_frame_rate.num) {
00211                 framerate = av_q2d(s->streams[i]->avg_frame_rate);
00212             } else {
00213                 framerate = 1 / av_q2d(s->streams[i]->codec->time_base);
00214             }
00215             video_enc = enc;
00216             if (enc->codec_tag == 0) {
00217                 av_log(s, AV_LOG_ERROR, "Video codec '%s' for stream %d is not compatible with FLV\n",
00218                        avcodec_get_name(enc->codec_id), i);
00219                 return AVERROR(EINVAL);
00220             }
00221             break;
00222         case AVMEDIA_TYPE_AUDIO:
00223             audio_enc = enc;
00224             if (get_audio_flags(s, enc) < 0)
00225                 return AVERROR_INVALIDDATA;
00226             break;
00227         case AVMEDIA_TYPE_DATA:
00228             if (enc->codec_id != AV_CODEC_ID_TEXT) {
00229                 av_log(s, AV_LOG_ERROR, "Data codec '%s' for stream %d is not compatible with FLV\n",
00230                        avcodec_get_name(enc->codec_id), i);
00231                 return AVERROR_INVALIDDATA;
00232             }
00233             data_enc = enc;
00234             break;
00235         default:
00236             av_log(s, AV_LOG_ERROR, "Codec type '%s' for stream %d is not compatible with FLV\n",
00237                    av_get_media_type_string(enc->codec_type), i);
00238             return AVERROR(EINVAL);
00239         }
00240         avpriv_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
00241 
00242         sc = av_mallocz(sizeof(FLVStreamContext));
00243         if (!sc)
00244             return AVERROR(ENOMEM);
00245         s->streams[i]->priv_data = sc;
00246         sc->last_ts = -1;
00247     }
00248 
00249     flv->delay = AV_NOPTS_VALUE;
00250 
00251     avio_write(pb, "FLV", 3);
00252     avio_w8(pb, 1);
00253     avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!audio_enc +
00254                 FLV_HEADER_FLAG_HASVIDEO * !!video_enc);
00255     avio_wb32(pb, 9);
00256     avio_wb32(pb, 0);
00257 
00258     for (i = 0; i < s->nb_streams; i++)
00259         if (s->streams[i]->codec->codec_tag == 5) {
00260             avio_w8(pb, 8);     // message type
00261             avio_wb24(pb, 0);   // include flags
00262             avio_wb24(pb, 0);   // time stamp
00263             avio_wb32(pb, 0);   // reserved
00264             avio_wb32(pb, 11);  // size
00265             flv->reserved = 5;
00266         }
00267 
00268     /* write meta_tag */
00269     avio_w8(pb, 18);            // tag type META
00270     metadata_size_pos = avio_tell(pb);
00271     avio_wb24(pb, 0);           // size of data part (sum of all parts below)
00272     avio_wb24(pb, 0);           // timestamp
00273     avio_wb32(pb, 0);           // reserved
00274 
00275     /* now data of data_size size */
00276 
00277     /* first event name as a string */
00278     avio_w8(pb, AMF_DATA_TYPE_STRING);
00279     put_amf_string(pb, "onMetaData"); // 12 bytes
00280 
00281     /* mixed array (hash) with size and string/type/data tuples */
00282     avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
00283     metadata_count_pos = avio_tell(pb);
00284     metadata_count = 5 * !!video_enc +
00285                      5 * !!audio_enc +
00286                      1 * !!data_enc  +
00287                      2; // +2 for duration and file size
00288 
00289     avio_wb32(pb, metadata_count);
00290 
00291     put_amf_string(pb, "duration");
00292     flv->duration_offset= avio_tell(pb);
00293 
00294     // fill in the guessed duration, it'll be corrected later if incorrect
00295     put_amf_double(pb, s->duration / AV_TIME_BASE);
00296 
00297     if (video_enc) {
00298         put_amf_string(pb, "width");
00299         put_amf_double(pb, video_enc->width);
00300 
00301         put_amf_string(pb, "height");
00302         put_amf_double(pb, video_enc->height);
00303 
00304         put_amf_string(pb, "videodatarate");
00305         put_amf_double(pb, video_enc->bit_rate / 1024.0);
00306 
00307         put_amf_string(pb, "framerate");
00308         put_amf_double(pb, framerate);
00309 
00310         put_amf_string(pb, "videocodecid");
00311         put_amf_double(pb, video_enc->codec_tag);
00312     }
00313 
00314     if (audio_enc) {
00315         put_amf_string(pb, "audiodatarate");
00316         put_amf_double(pb, audio_enc->bit_rate / 1024.0);
00317 
00318         put_amf_string(pb, "audiosamplerate");
00319         put_amf_double(pb, audio_enc->sample_rate);
00320 
00321         put_amf_string(pb, "audiosamplesize");
00322         put_amf_double(pb, audio_enc->codec_id == AV_CODEC_ID_PCM_U8 ? 8 : 16);
00323 
00324         put_amf_string(pb, "stereo");
00325         put_amf_bool(pb, audio_enc->channels == 2);
00326 
00327         put_amf_string(pb, "audiocodecid");
00328         put_amf_double(pb, audio_enc->codec_tag);
00329     }
00330 
00331     if (data_enc) {
00332         put_amf_string(pb, "datastream");
00333         put_amf_double(pb, 0.0);
00334     }
00335 
00336     while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
00337         if(   !strcmp(tag->key, "width")
00338             ||!strcmp(tag->key, "height")
00339             ||!strcmp(tag->key, "videodatarate")
00340             ||!strcmp(tag->key, "framerate")
00341             ||!strcmp(tag->key, "videocodecid")
00342             ||!strcmp(tag->key, "audiodatarate")
00343             ||!strcmp(tag->key, "audiosamplerate")
00344             ||!strcmp(tag->key, "audiosamplesize")
00345             ||!strcmp(tag->key, "stereo")
00346             ||!strcmp(tag->key, "audiocodecid")
00347             ||!strcmp(tag->key, "duration")
00348             ||!strcmp(tag->key, "onMetaData")
00349         ){
00350             av_log(s, AV_LOG_DEBUG, "Ignoring metadata for %s\n", tag->key);
00351             continue;
00352         }
00353         put_amf_string(pb, tag->key);
00354         avio_w8(pb, AMF_DATA_TYPE_STRING);
00355         put_amf_string(pb, tag->value);
00356         metadata_count++;
00357     }
00358 
00359     put_amf_string(pb, "filesize");
00360     flv->filesize_offset = avio_tell(pb);
00361     put_amf_double(pb, 0); // delayed write
00362 
00363     put_amf_string(pb, "");
00364     avio_w8(pb, AMF_END_OF_OBJECT);
00365 
00366     /* write total size of tag */
00367     data_size = avio_tell(pb) - metadata_size_pos - 10;
00368 
00369     avio_seek(pb, metadata_count_pos, SEEK_SET);
00370     avio_wb32(pb, metadata_count);
00371 
00372     avio_seek(pb, metadata_size_pos, SEEK_SET);
00373     avio_wb24(pb, data_size);
00374     avio_skip(pb, data_size + 10 - 3);
00375     avio_wb32(pb, data_size + 11);
00376 
00377     for (i = 0; i < s->nb_streams; i++) {
00378         AVCodecContext *enc = s->streams[i]->codec;
00379         if (enc->codec_id == AV_CODEC_ID_AAC || enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4) {
00380             int64_t pos;
00381             avio_w8(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO ?
00382                     FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
00383             avio_wb24(pb, 0); // size patched later
00384             avio_wb24(pb, 0); // ts
00385             avio_w8(pb, 0);   // ts ext
00386             avio_wb24(pb, 0); // streamid
00387             pos = avio_tell(pb);
00388             if (enc->codec_id == AV_CODEC_ID_AAC) {
00389                 avio_w8(pb, get_audio_flags(s, enc));
00390                 avio_w8(pb, 0); // AAC sequence header
00391                 avio_write(pb, enc->extradata, enc->extradata_size);
00392             } else {
00393                 avio_w8(pb, enc->codec_tag | FLV_FRAME_KEY); // flags
00394                 avio_w8(pb, 0); // AVC sequence header
00395                 avio_wb24(pb, 0); // composition time
00396                 ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size);
00397             }
00398             data_size = avio_tell(pb) - pos;
00399             avio_seek(pb, -data_size - 10, SEEK_CUR);
00400             avio_wb24(pb, data_size);
00401             avio_skip(pb, data_size + 10 - 3);
00402             avio_wb32(pb, data_size + 11); // previous tag size
00403         }
00404     }
00405 
00406     return 0;
00407 }
00408 
00409 static int flv_write_trailer(AVFormatContext *s)
00410 {
00411     int64_t file_size;
00412 
00413     AVIOContext *pb = s->pb;
00414     FLVContext *flv = s->priv_data;
00415     int i;
00416 
00417     /* Add EOS tag */
00418     for (i = 0; i < s->nb_streams; i++) {
00419         AVCodecContext *enc = s->streams[i]->codec;
00420         FLVStreamContext *sc = s->streams[i]->priv_data;
00421         if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&
00422                 (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4))
00423             put_avc_eos_tag(pb, sc->last_ts);
00424     }
00425 
00426     file_size = avio_tell(pb);
00427 
00428     /* update information */
00429     avio_seek(pb, flv->duration_offset, SEEK_SET);
00430     put_amf_double(pb, flv->duration / (double)1000);
00431     avio_seek(pb, flv->filesize_offset, SEEK_SET);
00432     put_amf_double(pb, file_size);
00433 
00434     avio_seek(pb, file_size, SEEK_SET);
00435     return 0;
00436 }
00437 
00438 static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
00439 {
00440     AVIOContext *pb      = s->pb;
00441     AVCodecContext *enc  = s->streams[pkt->stream_index]->codec;
00442     FLVContext *flv      = s->priv_data;
00443     FLVStreamContext *sc = s->streams[pkt->stream_index]->priv_data;
00444     unsigned ts;
00445     int size = pkt->size;
00446     uint8_t *data = NULL;
00447     int flags = -1, flags_size, ret;
00448 
00449     av_dlog(s, "type:%s pts:%"PRId64" dts:%"PRId64" size:%d\n",
00450             av_get_media_type_string(enc->codec_type), pkt->pts, pkt->dts, size);
00451 
00452     if (enc->codec_id == AV_CODEC_ID_VP6 || enc->codec_id == AV_CODEC_ID_VP6F ||
00453         enc->codec_id == AV_CODEC_ID_VP6A || enc->codec_id == AV_CODEC_ID_AAC)
00454         flags_size = 2;
00455     else if (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4)
00456         flags_size = 5;
00457     else
00458         flags_size = 1;
00459 
00460     switch (enc->codec_type) {
00461     case AVMEDIA_TYPE_VIDEO:
00462         avio_w8(pb, FLV_TAG_TYPE_VIDEO);
00463 
00464         flags = enc->codec_tag;
00465         if (flags == 0) {
00466             av_log(s, AV_LOG_ERROR,
00467                    "Video codec '%s' is not compatible with FLV\n",
00468                    avcodec_get_name(enc->codec_id));
00469             return AVERROR(EINVAL);
00470         }
00471 
00472         flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
00473         break;
00474     case AVMEDIA_TYPE_AUDIO:
00475         flags = get_audio_flags(s, enc);
00476 
00477         av_assert0(size);
00478 
00479         avio_w8(pb, FLV_TAG_TYPE_AUDIO);
00480         break;
00481     case AVMEDIA_TYPE_DATA:
00482         avio_w8(pb, FLV_TAG_TYPE_META);
00483         break;
00484     default:
00485         return AVERROR(EINVAL);
00486     }
00487 
00488     if (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4) {
00489         /* check if extradata looks like mp4 formated */
00490         if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1)
00491             if ((ret = ff_avc_parse_nal_units_buf(pkt->data, &data, &size)) < 0)
00492                 return ret;
00493     } else if (enc->codec_id == AV_CODEC_ID_AAC && pkt->size > 2 &&
00494                (AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
00495         av_log(s, AV_LOG_ERROR, "Malformed AAC bitstream detected: "
00496                "use audio bistream filter 'aac_adtstoasc' to fix it "
00497                "('-bsf:a aac_adtstoasc' option with ffmpeg)\n");
00498         return AVERROR_INVALIDDATA;
00499     }
00500 
00501     if (flv->delay == AV_NOPTS_VALUE)
00502         flv->delay = -pkt->dts;
00503 
00504     if (pkt->dts < -flv->delay) {
00505         av_log(s, AV_LOG_WARNING,
00506                "Packets are not in the proper order with respect to DTS\n");
00507         return AVERROR(EINVAL);
00508     }
00509 
00510     ts = pkt->dts + flv->delay; // add delay to force positive dts
00511 
00512     /* check Speex packet duration */
00513     if (enc->codec_id == AV_CODEC_ID_SPEEX && ts - sc->last_ts > 160)
00514         av_log(s, AV_LOG_WARNING, "Warning: Speex stream has more than "
00515                                   "8 frames per packet. Adobe Flash "
00516                                   "Player cannot handle this!\n");
00517 
00518     if (sc->last_ts < ts)
00519         sc->last_ts = ts;
00520 
00521     avio_wb24(pb, size + flags_size);
00522     avio_wb24(pb, ts);
00523     avio_w8(pb, (ts >> 24) & 0x7F); // timestamps are 32 bits _signed_
00524     avio_wb24(pb, flv->reserved);
00525 
00526     if (enc->codec_type == AVMEDIA_TYPE_DATA) {
00527         int data_size;
00528         int metadata_size_pos = avio_tell(pb);
00529         avio_w8(pb, AMF_DATA_TYPE_STRING);
00530         put_amf_string(pb, "onTextData");
00531         avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
00532         avio_wb32(pb, 2);
00533         put_amf_string(pb, "type");
00534         avio_w8(pb, AMF_DATA_TYPE_STRING);
00535         put_amf_string(pb, "Text");
00536         put_amf_string(pb, "text");
00537         avio_w8(pb, AMF_DATA_TYPE_STRING);
00538         put_amf_string(pb, pkt->data);
00539         put_amf_string(pb, "");
00540         avio_w8(pb, AMF_END_OF_OBJECT);
00541         /* write total size of tag */
00542         data_size = avio_tell(pb) - metadata_size_pos;
00543         avio_seek(pb, metadata_size_pos - 10, SEEK_SET);
00544         avio_wb24(pb, data_size);
00545         avio_seek(pb, data_size + 10 - 3, SEEK_CUR);
00546         avio_wb32(pb, data_size + 11);
00547     } else {
00548         av_assert1(flags>=0);
00549         avio_w8(pb,flags);
00550         if (enc->codec_id == AV_CODEC_ID_VP6)
00551             avio_w8(pb,0);
00552         if (enc->codec_id == AV_CODEC_ID_VP6F || enc->codec_id == AV_CODEC_ID_VP6A)
00553             avio_w8(pb, enc->extradata_size ? enc->extradata[0] : 0);
00554         else if (enc->codec_id == AV_CODEC_ID_AAC)
00555             avio_w8(pb,1); // AAC raw
00556         else if (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4) {
00557             avio_w8(pb,1); // AVC NALU
00558             avio_wb24(pb,pkt->pts - pkt->dts);
00559         }
00560 
00561         avio_write(pb, data ? data : pkt->data, size);
00562 
00563         avio_wb32(pb, size + flags_size + 11); // previous tag size
00564         flv->duration = FFMAX(flv->duration,
00565                               pkt->pts + flv->delay + pkt->duration);
00566     }
00567 
00568     avio_flush(pb);
00569     av_free(data);
00570 
00571     return pb->error;
00572 }
00573 
00574 AVOutputFormat ff_flv_muxer = {
00575     .name           = "flv",
00576     .long_name      = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
00577     .mime_type      = "video/x-flv",
00578     .extensions     = "flv",
00579     .priv_data_size = sizeof(FLVContext),
00580     .audio_codec    = CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_ADPCM_SWF,
00581     .video_codec    = AV_CODEC_ID_FLV1,
00582     .write_header   = flv_write_header,
00583     .write_packet   = flv_write_packet,
00584     .write_trailer  = flv_write_trailer,
00585     .codec_tag      = (const AVCodecTag* const []) {
00586                           flv_video_codec_ids, flv_audio_codec_ids, 0
00587                       },
00588     .flags          = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
00589                       AVFMT_TS_NONSTRICT,
00590 };