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00022 #include "libavutil/intfloat.h"
00023 #include "avformat.h"
00024 #include "flv.h"
00025 #include "internal.h"
00026 #include "avc.h"
00027 #include "metadata.h"
00028 #include "libavutil/dict.h"
00029
00030 #undef NDEBUG
00031 #include <assert.h>
00032
00033 static const AVCodecTag flv_video_codec_ids[] = {
00034 {CODEC_ID_FLV1, FLV_CODECID_H263 },
00035 {CODEC_ID_FLASHSV, FLV_CODECID_SCREEN},
00036 {CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2},
00037 {CODEC_ID_VP6F, FLV_CODECID_VP6 },
00038 {CODEC_ID_VP6, FLV_CODECID_VP6 },
00039 {CODEC_ID_H264, FLV_CODECID_H264 },
00040 {CODEC_ID_NONE, 0}
00041 };
00042
00043 static const AVCodecTag flv_audio_codec_ids[] = {
00044 {CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET},
00045 {CODEC_ID_PCM_U8, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET},
00046 {CODEC_ID_PCM_S16BE, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET},
00047 {CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET},
00048 {CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM >> FLV_AUDIO_CODECID_OFFSET},
00049 {CODEC_ID_AAC, FLV_CODECID_AAC >> FLV_AUDIO_CODECID_OFFSET},
00050 {CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET},
00051 {CODEC_ID_SPEEX, FLV_CODECID_SPEEX >> FLV_AUDIO_CODECID_OFFSET},
00052 {CODEC_ID_NONE, 0}
00053 };
00054
00055 typedef struct FLVContext {
00056 int reserved;
00057 int64_t duration_offset;
00058 int64_t filesize_offset;
00059 int64_t duration;
00060 int64_t delay;
00061 } FLVContext;
00062
00063 typedef struct FLVStreamContext {
00064 int64_t last_ts;
00065 } FLVStreamContext;
00066
00067 static int get_audio_flags(AVCodecContext *enc){
00068 int flags = (enc->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT : FLV_SAMPLESSIZE_8BIT;
00069
00070 if (enc->codec_id == CODEC_ID_AAC)
00071 return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ | FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
00072 else if (enc->codec_id == CODEC_ID_SPEEX) {
00073 if (enc->sample_rate != 16000) {
00074 av_log(enc, AV_LOG_ERROR, "flv only supports wideband (16kHz) Speex audio\n");
00075 return -1;
00076 }
00077 if (enc->channels != 1) {
00078 av_log(enc, AV_LOG_ERROR, "flv only supports mono Speex audio\n");
00079 return -1;
00080 }
00081 return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;
00082 } else {
00083 switch (enc->sample_rate) {
00084 case 44100:
00085 flags |= FLV_SAMPLERATE_44100HZ;
00086 break;
00087 case 22050:
00088 flags |= FLV_SAMPLERATE_22050HZ;
00089 break;
00090 case 11025:
00091 flags |= FLV_SAMPLERATE_11025HZ;
00092 break;
00093 case 16000:
00094 case 8000:
00095 case 5512:
00096 if(enc->codec_id != CODEC_ID_MP3){
00097 flags |= FLV_SAMPLERATE_SPECIAL;
00098 break;
00099 }
00100 default:
00101 av_log(enc, AV_LOG_ERROR, "flv does not support that sample rate, choose from (44100, 22050, 11025).\n");
00102 return -1;
00103 }
00104 }
00105
00106 if (enc->channels > 1) {
00107 flags |= FLV_STEREO;
00108 }
00109
00110 switch(enc->codec_id){
00111 case CODEC_ID_MP3:
00112 flags |= FLV_CODECID_MP3 | FLV_SAMPLESSIZE_16BIT;
00113 break;
00114 case CODEC_ID_PCM_U8:
00115 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_8BIT;
00116 break;
00117 case CODEC_ID_PCM_S16BE:
00118 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_16BIT;
00119 break;
00120 case CODEC_ID_PCM_S16LE:
00121 flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
00122 break;
00123 case CODEC_ID_ADPCM_SWF:
00124 flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT;
00125 break;
00126 case CODEC_ID_NELLYMOSER:
00127 if (enc->sample_rate == 8000) {
00128 flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
00129 } else if (enc->sample_rate == 16000) {
00130 flags |= FLV_CODECID_NELLYMOSER_16KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
00131 } else {
00132 flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;
00133 }
00134 break;
00135 case 0:
00136 flags |= enc->codec_tag<<4;
00137 break;
00138 default:
00139 av_log(enc, AV_LOG_ERROR, "codec not compatible with flv\n");
00140 return -1;
00141 }
00142
00143 return flags;
00144 }
00145
00146 static void put_amf_string(AVIOContext *pb, const char *str)
00147 {
00148 size_t len = strlen(str);
00149 avio_wb16(pb, len);
00150 avio_write(pb, str, len);
00151 }
00152
00153 static void put_avc_eos_tag(AVIOContext *pb, unsigned ts) {
00154 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
00155 avio_wb24(pb, 5);
00156 avio_wb24(pb, ts);
00157 avio_w8(pb, (ts >> 24) & 0x7F);
00158 avio_wb24(pb, 0);
00159 avio_w8(pb, 23);
00160 avio_w8(pb, 2);
00161 avio_wb24(pb, 0);
00162 avio_wb32(pb, 16);
00163 }
00164
00165 static void put_amf_double(AVIOContext *pb, double d)
00166 {
00167 avio_w8(pb, AMF_DATA_TYPE_NUMBER);
00168 avio_wb64(pb, av_double2int(d));
00169 }
00170
00171 static void put_amf_bool(AVIOContext *pb, int b) {
00172 avio_w8(pb, AMF_DATA_TYPE_BOOL);
00173 avio_w8(pb, !!b);
00174 }
00175
00176 static int flv_write_header(AVFormatContext *s)
00177 {
00178 AVIOContext *pb = s->pb;
00179 FLVContext *flv = s->priv_data;
00180 AVCodecContext *audio_enc = NULL, *video_enc = NULL;
00181 int i, metadata_count = 0;
00182 double framerate = 0.0;
00183 int64_t metadata_size_pos, data_size, metadata_count_pos;
00184 AVDictionaryEntry *tag = NULL;
00185
00186 for(i=0; i<s->nb_streams; i++){
00187 AVCodecContext *enc = s->streams[i]->codec;
00188 FLVStreamContext *sc;
00189 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
00190 if (s->streams[i]->r_frame_rate.den && s->streams[i]->r_frame_rate.num) {
00191 framerate = av_q2d(s->streams[i]->r_frame_rate);
00192 } else {
00193 framerate = 1/av_q2d(s->streams[i]->codec->time_base);
00194 }
00195 video_enc = enc;
00196 if(enc->codec_tag == 0) {
00197 av_log(enc, AV_LOG_ERROR, "video codec not compatible with flv\n");
00198 return -1;
00199 }
00200 } else {
00201 audio_enc = enc;
00202 if(get_audio_flags(enc)<0)
00203 return -1;
00204 }
00205 avpriv_set_pts_info(s->streams[i], 32, 1, 1000);
00206
00207 sc = av_mallocz(sizeof(FLVStreamContext));
00208 if (!sc)
00209 return AVERROR(ENOMEM);
00210 s->streams[i]->priv_data = sc;
00211 sc->last_ts = -1;
00212 }
00213 flv->delay = AV_NOPTS_VALUE;
00214
00215 avio_write(pb, "FLV", 3);
00216 avio_w8(pb,1);
00217 avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!audio_enc
00218 + FLV_HEADER_FLAG_HASVIDEO * !!video_enc);
00219 avio_wb32(pb,9);
00220 avio_wb32(pb,0);
00221
00222 for(i=0; i<s->nb_streams; i++){
00223 if(s->streams[i]->codec->codec_tag == 5){
00224 avio_w8(pb,8);
00225 avio_wb24(pb,0);
00226 avio_wb24(pb,0);
00227 avio_wb32(pb,0);
00228 avio_wb32(pb,11);
00229 flv->reserved=5;
00230 }
00231 }
00232
00233
00234 avio_w8(pb, 18);
00235 metadata_size_pos= avio_tell(pb);
00236 avio_wb24(pb, 0);
00237 avio_wb24(pb, 0);
00238 avio_wb32(pb, 0);
00239
00240
00241
00242
00243 avio_w8(pb, AMF_DATA_TYPE_STRING);
00244 put_amf_string(pb, "onMetaData");
00245
00246
00247 avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
00248 metadata_count_pos = avio_tell(pb);
00249 metadata_count = 5*!!video_enc + 5*!!audio_enc + 2;
00250 avio_wb32(pb, metadata_count);
00251
00252 put_amf_string(pb, "duration");
00253 flv->duration_offset= avio_tell(pb);
00254 put_amf_double(pb, s->duration / AV_TIME_BASE);
00255
00256 if(video_enc){
00257 put_amf_string(pb, "width");
00258 put_amf_double(pb, video_enc->width);
00259
00260 put_amf_string(pb, "height");
00261 put_amf_double(pb, video_enc->height);
00262
00263 put_amf_string(pb, "videodatarate");
00264 put_amf_double(pb, video_enc->bit_rate / 1024.0);
00265
00266 put_amf_string(pb, "framerate");
00267 put_amf_double(pb, framerate);
00268
00269 put_amf_string(pb, "videocodecid");
00270 put_amf_double(pb, video_enc->codec_tag);
00271 }
00272
00273 if(audio_enc){
00274 put_amf_string(pb, "audiodatarate");
00275 put_amf_double(pb, audio_enc->bit_rate / 1024.0);
00276
00277 put_amf_string(pb, "audiosamplerate");
00278 put_amf_double(pb, audio_enc->sample_rate);
00279
00280 put_amf_string(pb, "audiosamplesize");
00281 put_amf_double(pb, audio_enc->codec_id == CODEC_ID_PCM_U8 ? 8 : 16);
00282
00283 put_amf_string(pb, "stereo");
00284 put_amf_bool(pb, audio_enc->channels == 2);
00285
00286 put_amf_string(pb, "audiocodecid");
00287 put_amf_double(pb, audio_enc->codec_tag);
00288 }
00289
00290 while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
00291 put_amf_string(pb, tag->key);
00292 avio_w8(pb, AMF_DATA_TYPE_STRING);
00293 put_amf_string(pb, tag->value);
00294 metadata_count++;
00295 }
00296
00297 put_amf_string(pb, "filesize");
00298 flv->filesize_offset= avio_tell(pb);
00299 put_amf_double(pb, 0);
00300
00301 put_amf_string(pb, "");
00302 avio_w8(pb, AMF_END_OF_OBJECT);
00303
00304
00305 data_size= avio_tell(pb) - metadata_size_pos - 10;
00306
00307 avio_seek(pb, metadata_count_pos, SEEK_SET);
00308 avio_wb32(pb, metadata_count);
00309
00310 avio_seek(pb, metadata_size_pos, SEEK_SET);
00311 avio_wb24(pb, data_size);
00312 avio_skip(pb, data_size + 10 - 3);
00313 avio_wb32(pb, data_size + 11);
00314
00315 for (i = 0; i < s->nb_streams; i++) {
00316 AVCodecContext *enc = s->streams[i]->codec;
00317 if (enc->codec_id == CODEC_ID_AAC || enc->codec_id == CODEC_ID_H264) {
00318 int64_t pos;
00319 avio_w8(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO ?
00320 FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
00321 avio_wb24(pb, 0);
00322 avio_wb24(pb, 0);
00323 avio_w8(pb, 0);
00324 avio_wb24(pb, 0);
00325 pos = avio_tell(pb);
00326 if (enc->codec_id == CODEC_ID_AAC) {
00327 avio_w8(pb, get_audio_flags(enc));
00328 avio_w8(pb, 0);
00329 avio_write(pb, enc->extradata, enc->extradata_size);
00330 } else {
00331 avio_w8(pb, enc->codec_tag | FLV_FRAME_KEY);
00332 avio_w8(pb, 0);
00333 avio_wb24(pb, 0);
00334 ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size);
00335 }
00336 data_size = avio_tell(pb) - pos;
00337 avio_seek(pb, -data_size - 10, SEEK_CUR);
00338 avio_wb24(pb, data_size);
00339 avio_skip(pb, data_size + 10 - 3);
00340 avio_wb32(pb, data_size + 11);
00341 }
00342 }
00343
00344 return 0;
00345 }
00346
00347 static int flv_write_trailer(AVFormatContext *s)
00348 {
00349 int64_t file_size;
00350
00351 AVIOContext *pb = s->pb;
00352 FLVContext *flv = s->priv_data;
00353 int i;
00354
00355
00356 for (i = 0; i < s->nb_streams; i++) {
00357 AVCodecContext *enc = s->streams[i]->codec;
00358 FLVStreamContext *sc = s->streams[i]->priv_data;
00359 if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&
00360 enc->codec_id == CODEC_ID_H264) {
00361 put_avc_eos_tag(pb, sc->last_ts);
00362 }
00363 }
00364
00365 file_size = avio_tell(pb);
00366
00367
00368 avio_seek(pb, flv->duration_offset, SEEK_SET);
00369 put_amf_double(pb, flv->duration / (double)1000);
00370 avio_seek(pb, flv->filesize_offset, SEEK_SET);
00371 put_amf_double(pb, file_size);
00372
00373 avio_seek(pb, file_size, SEEK_SET);
00374 return 0;
00375 }
00376
00377 static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
00378 {
00379 AVIOContext *pb = s->pb;
00380 AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
00381 FLVContext *flv = s->priv_data;
00382 FLVStreamContext *sc = s->streams[pkt->stream_index]->priv_data;
00383 unsigned ts;
00384 int size= pkt->size;
00385 uint8_t *data= NULL;
00386 int flags, flags_size;
00387
00388
00389
00390 if(enc->codec_id == CODEC_ID_VP6 || enc->codec_id == CODEC_ID_VP6F ||
00391 enc->codec_id == CODEC_ID_AAC)
00392 flags_size= 2;
00393 else if(enc->codec_id == CODEC_ID_H264)
00394 flags_size= 5;
00395 else
00396 flags_size= 1;
00397
00398 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
00399 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
00400
00401 flags = enc->codec_tag;
00402 if(flags == 0) {
00403 av_log(enc, AV_LOG_ERROR, "video codec %X not compatible with flv\n",enc->codec_id);
00404 return -1;
00405 }
00406
00407 flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
00408 } else {
00409 assert(enc->codec_type == AVMEDIA_TYPE_AUDIO);
00410 flags = get_audio_flags(enc);
00411
00412 assert(size);
00413
00414 avio_w8(pb, FLV_TAG_TYPE_AUDIO);
00415 }
00416
00417 if (enc->codec_id == CODEC_ID_H264) {
00418
00419 if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1) {
00420 if (ff_avc_parse_nal_units_buf(pkt->data, &data, &size) < 0)
00421 return -1;
00422 }
00423 }
00424 if (flv->delay == AV_NOPTS_VALUE)
00425 flv->delay = -pkt->dts;
00426 if (pkt->dts < -flv->delay) {
00427 av_log(s, AV_LOG_WARNING, "Packets are not in the proper order with "
00428 "respect to DTS\n");
00429 return AVERROR(EINVAL);
00430 }
00431
00432 ts = pkt->dts + flv->delay;
00433
00434
00435 if (enc->codec_id == CODEC_ID_SPEEX && ts - sc->last_ts > 160) {
00436 av_log(s, AV_LOG_WARNING, "Warning: Speex stream has more than "
00437 "8 frames per packet. Adobe Flash "
00438 "Player cannot handle this!\n");
00439 }
00440
00441 if (sc->last_ts < ts)
00442 sc->last_ts = ts;
00443
00444 avio_wb24(pb,size + flags_size);
00445 avio_wb24(pb,ts);
00446 avio_w8(pb,(ts >> 24) & 0x7F);
00447 avio_wb24(pb,flv->reserved);
00448 avio_w8(pb,flags);
00449 if (enc->codec_id == CODEC_ID_VP6)
00450 avio_w8(pb,0);
00451 if (enc->codec_id == CODEC_ID_VP6F)
00452 avio_w8(pb, enc->extradata_size ? enc->extradata[0] : 0);
00453 else if (enc->codec_id == CODEC_ID_AAC)
00454 avio_w8(pb,1);
00455 else if (enc->codec_id == CODEC_ID_H264) {
00456 avio_w8(pb,1);
00457 avio_wb24(pb,pkt->pts - pkt->dts);
00458 }
00459
00460 avio_write(pb, data ? data : pkt->data, size);
00461
00462 avio_wb32(pb,size+flags_size+11);
00463 flv->duration = FFMAX(flv->duration, pkt->pts + flv->delay + pkt->duration);
00464
00465 avio_flush(pb);
00466
00467 av_free(data);
00468
00469 return pb->error;
00470 }
00471
00472 AVOutputFormat ff_flv_muxer = {
00473 .name = "flv",
00474 .long_name = NULL_IF_CONFIG_SMALL("FLV format"),
00475 .mime_type = "video/x-flv",
00476 .extensions = "flv",
00477 .priv_data_size = sizeof(FLVContext),
00478 #if CONFIG_LIBMP3LAME
00479 .audio_codec = CODEC_ID_MP3,
00480 #else
00481 .audio_codec = CODEC_ID_ADPCM_SWF,
00482 #endif
00483 .video_codec = CODEC_ID_FLV1,
00484 .write_header = flv_write_header,
00485 .write_packet = flv_write_packet,
00486 .write_trailer = flv_write_trailer,
00487 .codec_tag= (const AVCodecTag* const []){flv_video_codec_ids, flv_audio_codec_ids, 0},
00488 .flags= AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
00489 };