FFmpeg: libavformat/flvenc.c Source File

FFmpeg

[フレーム]

libavformat

flvenc.c

Go to the documentation of this file.

1 /*

2 * FLV muxer

4 *

5 * This file is part of FFmpeg.

6 *

7 * FFmpeg is free software; you can redistribute it and/or

8 * modify it under the terms of the GNU Lesser General Public

9 * License as published by the Free Software Foundation; either

10 * version 2.1 of the License, or (at your option) any later version.

11 *

12 * FFmpeg is distributed in the hope that it will be useful,

13 * but WITHOUT ANY WARRANTY; without even the implied warranty of

14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

15 * Lesser General Public License for more details.

16 *

17 * You should have received a copy of the GNU Lesser General Public

18 * License along with FFmpeg; if not, write to the Free Software

19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

20 */

22 #include "libavutil/intreadwrite.h"

23 #include "libavutil/dict.h"

24 #include "libavutil/intfloat.h"

25 #include "libavutil/avassert.h"

26 #include "avc.h"

27 #include "avformat.h"

28 #include "flv.h"

29 #include "internal.h"

30 #include "metadata.h"

33 static const AVCodecTag flv_video_codec_ids[] = {

34 { AV_CODEC_ID_FLV1, FLV_CODECID_H263 },

35 { AV_CODEC_ID_H263, FLV_CODECID_REALH263 },

36 { AV_CODEC_ID_MPEG4, FLV_CODECID_MPEG4 },

37 { AV_CODEC_ID_FLASHSV, FLV_CODECID_SCREEN },

38 { AV_CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2 },

39 { AV_CODEC_ID_VP6F, FLV_CODECID_VP6 },

40 { AV_CODEC_ID_VP6A, FLV_CODECID_VP6A },

41 { AV_CODEC_ID_H264, FLV_CODECID_H264 },

42 { AV_CODEC_ID_NONE, 0 }

43 };

45 static const AVCodecTag flv_audio_codec_ids[] = {

46 { AV_CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET },

47 { AV_CODEC_ID_PCM_U8, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET },

48 { AV_CODEC_ID_PCM_S16BE, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET },

49 { AV_CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET },

50 { AV_CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM >> FLV_AUDIO_CODECID_OFFSET },

51 { AV_CODEC_ID_AAC, FLV_CODECID_AAC >> FLV_AUDIO_CODECID_OFFSET },

52 { AV_CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET },

53 { AV_CODEC_ID_PCM_MULAW, FLV_CODECID_PCM_MULAW >> FLV_AUDIO_CODECID_OFFSET },

54 { AV_CODEC_ID_PCM_ALAW, FLV_CODECID_PCM_ALAW >> FLV_AUDIO_CODECID_OFFSET },

55 { AV_CODEC_ID_SPEEX, FLV_CODECID_SPEEX >> FLV_AUDIO_CODECID_OFFSET },

56 { AV_CODEC_ID_NONE, 0 }

57 };

59 typedef struct FLVContext {

60 int reserved;

61 int64_t duration_offset;

62 int64_t filesize_offset;

63 int64_t duration;

64 int64_t delay; ///< first dts delay (needed for AVC & Speex)

65 } FLVContext;

67 typedef struct FLVStreamContext {

68 int64_t last_ts; ///< last timestamp for each stream

69 } FLVStreamContext;

71 static int get_audio_flags(AVFormatContext *s, AVCodecContext *enc)

72 {

73 int flags = (enc->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT

74 : FLV_SAMPLESSIZE_8BIT;

76 if (enc->codec_id == AV_CODEC_ID_AAC) // specs force these parameters

77 return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ |

78 FLV_SAMPLESSIZE_16BIT | FLV_STEREO;

79 else if (enc->codec_id == AV_CODEC_ID_SPEEX) {

80 if (enc->sample_rate != 16000) {

81 av_log(s, AV_LOG_ERROR,

82 "FLV only supports wideband (16kHz) Speex audio\n");

83 return AVERROR(EINVAL);

84 }

85 if (enc->channels != 1) {

86 av_log(s, AV_LOG_ERROR, "FLV only supports mono Speex audio\n");

87 return AVERROR(EINVAL);

88 }

89 return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;

90 } else {

91 switch (enc->sample_rate) {

92 case 44100:

93 flags |= FLV_SAMPLERATE_44100HZ;

94 break;

95 case 22050:

96 flags |= FLV_SAMPLERATE_22050HZ;

97 break;

98 case 11025:

99 flags |= FLV_SAMPLERATE_11025HZ;

100 break;

101 case 16000: // nellymoser only

102 case 8000: // nellymoser only

103 case 5512: // not MP3

104 if (enc->codec_id != AV_CODEC_ID_MP3) {

105 flags |= FLV_SAMPLERATE_SPECIAL;

106 break;

107 }

108 default:

109 av_log(s, AV_LOG_ERROR,

110 "FLV does not support sample rate %d, "

111 "choose from (44100, 22050, 11025)\n", enc->sample_rate);

112 return AVERROR(EINVAL);

113 }

114 }

115

116 if (enc->channels > 1)

117 flags |= FLV_STEREO;

118

119 switch (enc->codec_id) {

120 case AV_CODEC_ID_MP3:

121 flags |= FLV_CODECID_MP3 | FLV_SAMPLESSIZE_16BIT;

122 break;

123 case AV_CODEC_ID_PCM_U8:

124 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_8BIT;

125 break;

126 case AV_CODEC_ID_PCM_S16BE:

127 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_16BIT;

128 break;

129 case AV_CODEC_ID_PCM_S16LE:

130 flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;

131 break;

132 case AV_CODEC_ID_ADPCM_SWF:

133 flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT;

134 break;

135 case AV_CODEC_ID_NELLYMOSER:

136 if (enc->sample_rate == 8000)

137 flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT;

138 else if (enc->sample_rate == 16000)

139 flags |= FLV_CODECID_NELLYMOSER_16KHZ_MONO | FLV_SAMPLESSIZE_16BIT;

140 else

141 flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;

142 break;

143 case AV_CODEC_ID_PCM_MULAW:

144 flags = FLV_CODECID_PCM_MULAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;

145 break;

146 case AV_CODEC_ID_PCM_ALAW:

147 flags = FLV_CODECID_PCM_ALAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;

148 break;

149 case 0:

150 flags |= enc->codec_tag << 4;

151 break;

152 default:

153 av_log(s, AV_LOG_ERROR, "Audio codec '%s' not compatible with FLV\n",

154 avcodec_get_name(enc->codec_id));

155 return AVERROR(EINVAL);

156 }

157

158 return flags;

159 }

160

161 static void put_amf_string(AVIOContext *pb, const char *str)

162 {

163 size_t len = strlen(str);

164 avio_wb16(pb, len);

165 avio_write(pb, str, len);

166 }

167

168 static void put_avc_eos_tag(AVIOContext *pb, unsigned ts)

169 {

170 avio_w8(pb, FLV_TAG_TYPE_VIDEO);

171 avio_wb24(pb, 5); /* Tag Data Size */

172 avio_wb24(pb, ts); /* lower 24 bits of timestamp in ms */

173 avio_w8(pb, (ts >> 24) & 0x7F); /* MSB of ts in ms */

174 avio_wb24(pb, 0); /* StreamId = 0 */

175 avio_w8(pb, 23); /* ub[4] FrameType = 1, ub[4] CodecId = 7 */

176 avio_w8(pb, 2); /* AVC end of sequence */

177 avio_wb24(pb, 0); /* Always 0 for AVC EOS. */

178 avio_wb32(pb, 16); /* Size of FLV tag */

179 }

180

181 static void put_amf_double(AVIOContext *pb, double d)

182 {

183 avio_w8(pb, AMF_DATA_TYPE_NUMBER);

184 avio_wb64(pb, av_double2int(d));

185 }

186

187 static void put_amf_bool(AVIOContext *pb, int b)

188 {

189 avio_w8(pb, AMF_DATA_TYPE_BOOL);

190 avio_w8(pb, !!b);

191 }

192

193 static int flv_write_header(AVFormatContext *s)

194 {

195 AVIOContext *pb = s->pb;

196 FLVContext *flv = s->priv_data;

197 AVCodecContext *audio_enc = NULL, *video_enc = NULL, *data_enc = NULL;

198 int i, metadata_count = 0;

199 double framerate = 0.0;

200 int64_t metadata_size_pos, data_size, metadata_count_pos;

201 AVDictionaryEntry *tag = NULL;

202

203 for (i = 0; i < s->nb_streams; i++) {

204 AVCodecContext *enc = s->streams[i]->codec;

205 FLVStreamContext *sc;

206 switch (enc->codec_type) {

207 case AVMEDIA_TYPE_VIDEO:

208 if (s->streams[i]->avg_frame_rate.den &&

209 s->streams[i]->avg_frame_rate.num) {

210 framerate = av_q2d(s->streams[i]->avg_frame_rate);

211 } else {

212 framerate = 1 / av_q2d(s->streams[i]->codec->time_base);

213 }

214 if (video_enc) {

215 av_log(s, AV_LOG_ERROR,

216 "at most one video stream is supported in flv\n");

217 return AVERROR(EINVAL);

218 }

219 video_enc = enc;

220 if (enc->codec_tag == 0) {

221 av_log(s, AV_LOG_ERROR, "Video codec '%s' for stream %d is not compatible with FLV\n",

222 avcodec_get_name(enc->codec_id), i);

223 return AVERROR(EINVAL);

224 }

225 break;

226 case AVMEDIA_TYPE_AUDIO:

227 if (audio_enc) {

228 av_log(s, AV_LOG_ERROR,

229 "at most one audio stream is supported in flv\n");

230 return AVERROR(EINVAL);

231 }

232 audio_enc = enc;

233 if (get_audio_flags(s, enc) < 0)

234 return AVERROR_INVALIDDATA;

235 break;

236 case AVMEDIA_TYPE_DATA:

237 if (enc->codec_id != AV_CODEC_ID_TEXT) {

238 av_log(s, AV_LOG_ERROR, "Data codec '%s' for stream %d is not compatible with FLV\n",

239 avcodec_get_name(enc->codec_id), i);

240 return AVERROR_INVALIDDATA;

241 }

242 data_enc = enc;

243 break;

244 default:

245 av_log(s, AV_LOG_ERROR, "Codec type '%s' for stream %d is not compatible with FLV\n",

246 av_get_media_type_string(enc->codec_type), i);

247 return AVERROR(EINVAL);

248 }

249 avpriv_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */

250

251 sc = av_mallocz(sizeof(FLVStreamContext));

252 if (!sc)

253 return AVERROR(ENOMEM);

254 s->streams[i]->priv_data = sc;

255 sc->last_ts = -1;

256 }

257

258 flv->delay = AV_NOPTS_VALUE;

259

260 avio_write(pb, "FLV", 3);

261 avio_w8(pb, 1);

262 avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!audio_enc +

263 FLV_HEADER_FLAG_HASVIDEO * !!video_enc);

264 avio_wb32(pb, 9);

265 avio_wb32(pb, 0);

266

267 for (i = 0; i < s->nb_streams; i++)

268 if (s->streams[i]->codec->codec_tag == 5) {

269 avio_w8(pb, 8); // message type

270 avio_wb24(pb, 0); // include flags

271 avio_wb24(pb, 0); // time stamp

272 avio_wb32(pb, 0); // reserved

273 avio_wb32(pb, 11); // size

274 flv->reserved = 5;

275 }

276

277 /* write meta_tag */

278 avio_w8(pb, 18); // tag type META

279 metadata_size_pos = avio_tell(pb);

280 avio_wb24(pb, 0); // size of data part (sum of all parts below)

281 avio_wb24(pb, 0); // timestamp

282 avio_wb32(pb, 0); // reserved

283

284 /* now data of data_size size */

285

286 /* first event name as a string */

287 avio_w8(pb, AMF_DATA_TYPE_STRING);

288 put_amf_string(pb, "onMetaData"); // 12 bytes

289

290 /* mixed array (hash) with size and string/type/data tuples */

291 avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);

292 metadata_count_pos = avio_tell(pb);

293 metadata_count = 5 * !!video_enc +

294 5 * !!audio_enc +

295 1 * !!data_enc +

296 2; // +2 for duration and file size

297

298 avio_wb32(pb, metadata_count);

299

300 put_amf_string(pb, "duration");

301 flv->duration_offset= avio_tell(pb);

302

303 // fill in the guessed duration, it'll be corrected later if incorrect

304 put_amf_double(pb, s->duration / AV_TIME_BASE);

305

306 if (video_enc) {

307 put_amf_string(pb, "width");

308 put_amf_double(pb, video_enc->width);

309

310 put_amf_string(pb, "height");

311 put_amf_double(pb, video_enc->height);

312

313 put_amf_string(pb, "videodatarate");

314 put_amf_double(pb, video_enc->bit_rate / 1024.0);

315

316 put_amf_string(pb, "framerate");

317 put_amf_double(pb, framerate);

318

319 put_amf_string(pb, "videocodecid");

320 put_amf_double(pb, video_enc->codec_tag);

321 }

322

323 if (audio_enc) {

324 put_amf_string(pb, "audiodatarate");

325 put_amf_double(pb, audio_enc->bit_rate / 1024.0);

326

327 put_amf_string(pb, "audiosamplerate");

328 put_amf_double(pb, audio_enc->sample_rate);

329

330 put_amf_string(pb, "audiosamplesize");

331 put_amf_double(pb, audio_enc->codec_id == AV_CODEC_ID_PCM_U8 ? 8 : 16);

332

333 put_amf_string(pb, "stereo");

334 put_amf_bool(pb, audio_enc->channels == 2);

335

336 put_amf_string(pb, "audiocodecid");

337 put_amf_double(pb, audio_enc->codec_tag);

338 }

339

340 if (data_enc) {

341 put_amf_string(pb, "datastream");

342 put_amf_double(pb, 0.0);

343 }

344

345 while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {

346 if( !strcmp(tag->key, "width")

347 ||!strcmp(tag->key, "height")

348 ||!strcmp(tag->key, "videodatarate")

349 ||!strcmp(tag->key, "framerate")

350 ||!strcmp(tag->key, "videocodecid")

351 ||!strcmp(tag->key, "audiodatarate")

352 ||!strcmp(tag->key, "audiosamplerate")

353 ||!strcmp(tag->key, "audiosamplesize")

354 ||!strcmp(tag->key, "stereo")

355 ||!strcmp(tag->key, "audiocodecid")

356 ||!strcmp(tag->key, "duration")

357 ||!strcmp(tag->key, "onMetaData")

358 ){

359 av_log(s, AV_LOG_DEBUG, "Ignoring metadata for %s\n", tag->key);

360 continue;

361 }

362 put_amf_string(pb, tag->key);

363 avio_w8(pb, AMF_DATA_TYPE_STRING);

364 put_amf_string(pb, tag->value);

365 metadata_count++;

366 }

367

368 put_amf_string(pb, "filesize");

369 flv->filesize_offset = avio_tell(pb);

370 put_amf_double(pb, 0); // delayed write

371

372 put_amf_string(pb, "");

373 avio_w8(pb, AMF_END_OF_OBJECT);

374

375 /* write total size of tag */

376 data_size = avio_tell(pb) - metadata_size_pos - 10;

377

378 avio_seek(pb, metadata_count_pos, SEEK_SET);

379 avio_wb32(pb, metadata_count);

380

381 avio_seek(pb, metadata_size_pos, SEEK_SET);

382 avio_wb24(pb, data_size);

383 avio_skip(pb, data_size + 10 - 3);

384 avio_wb32(pb, data_size + 11);

385

386 for (i = 0; i < s->nb_streams; i++) {

387 AVCodecContext *enc = s->streams[i]->codec;

388 if (enc->codec_id == AV_CODEC_ID_AAC || enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4) {

389 int64_t pos;

390 avio_w8(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO ?

391 FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);

392 avio_wb24(pb, 0); // size patched later

393 avio_wb24(pb, 0); // ts

394 avio_w8(pb, 0); // ts ext

395 avio_wb24(pb, 0); // streamid

396 pos = avio_tell(pb);

397 if (enc->codec_id == AV_CODEC_ID_AAC) {

398 avio_w8(pb, get_audio_flags(s, enc));

399 avio_w8(pb, 0); // AAC sequence header

400 avio_write(pb, enc->extradata, enc->extradata_size);

401 } else {

402 avio_w8(pb, enc->codec_tag | FLV_FRAME_KEY); // flags

403 avio_w8(pb, 0); // AVC sequence header

404 avio_wb24(pb, 0); // composition time

405 ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size);

406 }

407 data_size = avio_tell(pb) - pos;

408 avio_seek(pb, -data_size - 10, SEEK_CUR);

409 avio_wb24(pb, data_size);

410 avio_skip(pb, data_size + 10 - 3);

411 avio_wb32(pb, data_size + 11); // previous tag size

412 }

413 }

414

415 return 0;

416 }

417

418 static int flv_write_trailer(AVFormatContext *s)

419 {

420 int64_t file_size;

421

422 AVIOContext *pb = s->pb;

423 FLVContext *flv = s->priv_data;

424 int i;

425

426 /* Add EOS tag */

427 for (i = 0; i < s->nb_streams; i++) {

428 AVCodecContext *enc = s->streams[i]->codec;

429 FLVStreamContext *sc = s->streams[i]->priv_data;

430 if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&

431 (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4))

432 put_avc_eos_tag(pb, sc->last_ts);

433 }

434

435 file_size = avio_tell(pb);

436

437 /* update information */

438 if (avio_seek(pb, flv->duration_offset, SEEK_SET) < 0)

439 av_log(s, AV_LOG_WARNING, "Failed to update header with correct duration.\n");

440 else

441 put_amf_double(pb, flv->duration / (double)1000);

442 if (avio_seek(pb, flv->filesize_offset, SEEK_SET) < 0)

443 av_log(s, AV_LOG_WARNING, "Failed to update header with correct filesize.\n");

444 else

445 put_amf_double(pb, file_size);

446

447 avio_seek(pb, file_size, SEEK_SET);

448 return 0;

449 }

450

451 static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)

452 {

453 AVIOContext *pb = s->pb;

454 AVCodecContext *enc = s->streams[pkt->stream_index]->codec;

455 FLVContext *flv = s->priv_data;

456 FLVStreamContext *sc = s->streams[pkt->stream_index]->priv_data;

457 unsigned ts;

458 int size = pkt->size;

459 uint8_t *data = NULL;

460 int flags = -1, flags_size, ret;

461

462 if (enc->codec_id == AV_CODEC_ID_VP6F || enc->codec_id == AV_CODEC_ID_VP6A ||

463 enc->codec_id == AV_CODEC_ID_AAC)

464 flags_size = 2;

465 else if (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4)

466 flags_size = 5;

467 else

468 flags_size = 1;

469

470 switch (enc->codec_type) {

471 case AVMEDIA_TYPE_VIDEO:

472 avio_w8(pb, FLV_TAG_TYPE_VIDEO);

473

474 flags = enc->codec_tag;

475 if (flags == 0) {

476 av_log(s, AV_LOG_ERROR,

477 "Video codec '%s' is not compatible with FLV\n",

478 avcodec_get_name(enc->codec_id));

479 return AVERROR(EINVAL);

480 }

481

482 flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;

483 break;

484 case AVMEDIA_TYPE_AUDIO:

485 flags = get_audio_flags(s, enc);

486

487 av_assert0(size);

488

489 avio_w8(pb, FLV_TAG_TYPE_AUDIO);

490 break;

491 case AVMEDIA_TYPE_DATA:

492 avio_w8(pb, FLV_TAG_TYPE_META);

493 break;

494 default:

495 return AVERROR(EINVAL);

496 }

497

498 if (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4) {

499 /* check if extradata looks like mp4 formated */

500 if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1)

501 if ((ret = ff_avc_parse_nal_units_buf(pkt->data, &data, &size)) < 0)

502 return ret;

503 } else if (enc->codec_id == AV_CODEC_ID_AAC && pkt->size > 2 &&

504 (AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {

505 if (!s->streams[pkt->stream_index]->nb_frames) {

506 av_log(s, AV_LOG_ERROR, "Malformed AAC bitstream detected: "

507 "use audio bitstream filter 'aac_adtstoasc' to fix it "

508 "('-bsf:a aac_adtstoasc' option with ffmpeg)\n");

509 return AVERROR_INVALIDDATA;

510 }

511 av_log(s, AV_LOG_WARNING, "aac bitstream error\n");

512 }

513

514 if (flv->delay == AV_NOPTS_VALUE)

515 flv->delay = -pkt->dts;

516

517 if (pkt->dts < -flv->delay) {

518 av_log(s, AV_LOG_WARNING,

519 "Packets are not in the proper order with respect to DTS\n");

520 return AVERROR(EINVAL);

521 }

522

523 ts = pkt->dts + flv->delay; // add delay to force positive dts

524

525 /* check Speex packet duration */

526 if (enc->codec_id == AV_CODEC_ID_SPEEX && ts - sc->last_ts > 160)

527 av_log(s, AV_LOG_WARNING, "Warning: Speex stream has more than "

528 "8 frames per packet. Adobe Flash "

529 "Player cannot handle this!\n");

530

531 if (sc->last_ts < ts)

532 sc->last_ts = ts;

533

534 avio_wb24(pb, size + flags_size);

535 avio_wb24(pb, ts);

536 avio_w8(pb, (ts >> 24) & 0x7F); // timestamps are 32 bits _signed_

537 avio_wb24(pb, flv->reserved);

538

539 if (enc->codec_type == AVMEDIA_TYPE_DATA) {

540 int data_size;

541 int metadata_size_pos = avio_tell(pb);

542 avio_w8(pb, AMF_DATA_TYPE_STRING);

543 put_amf_string(pb, "onTextData");

544 avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);

545 avio_wb32(pb, 2);

546 put_amf_string(pb, "type");

547 avio_w8(pb, AMF_DATA_TYPE_STRING);

548 put_amf_string(pb, "Text");

549 put_amf_string(pb, "text");

550 avio_w8(pb, AMF_DATA_TYPE_STRING);

551 put_amf_string(pb, pkt->data);

552 put_amf_string(pb, "");

553 avio_w8(pb, AMF_END_OF_OBJECT);

554 /* write total size of tag */

555 data_size = avio_tell(pb) - metadata_size_pos;

556 avio_seek(pb, metadata_size_pos - 10, SEEK_SET);

557 avio_wb24(pb, data_size);

558 avio_seek(pb, data_size + 10 - 3, SEEK_CUR);

559 avio_wb32(pb, data_size + 11);

560 } else {

561 av_assert1(flags>=0);

562 avio_w8(pb,flags);

563 if (enc->codec_id == AV_CODEC_ID_VP6F || enc->codec_id == AV_CODEC_ID_VP6A) {

564 if (enc->extradata_size)

565 avio_w8(pb, enc->extradata[0]);

566 else

567 avio_w8(pb, ((FFALIGN(enc->width, 16) - enc->width) << 4) |

568 (FFALIGN(enc->height, 16) - enc->height));

569 } else if (enc->codec_id == AV_CODEC_ID_AAC)

570 avio_w8(pb, 1); // AAC raw

571 else if (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4) {

572 avio_w8(pb, 1); // AVC NALU

573 avio_wb24(pb, pkt->pts - pkt->dts);

574 }

575

576 avio_write(pb, data ? data : pkt->data, size);

577

578 avio_wb32(pb, size + flags_size + 11); // previous tag size

579 flv->duration = FFMAX(flv->duration,

580 pkt->pts + flv->delay + pkt->duration);

581 }

582

583 av_free(data);

584

585 return pb->error;

586 }

587

588 AVOutputFormat ff_flv_muxer = {

589 .name = "flv",

590 .long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),

591 .mime_type = "video/x-flv",

592 .extensions = "flv",

593 .priv_data_size = sizeof(FLVContext),

594 .audio_codec = CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_ADPCM_SWF,

595 .video_codec = AV_CODEC_ID_FLV1,

596 .write_header = flv_write_header,

597 .write_packet = flv_write_packet,

598 .write_trailer = flv_write_trailer,

599 .codec_tag = (const AVCodecTag* const []) {

600 flv_video_codec_ids, flv_audio_codec_ids, 0

601 },

602 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |

603 AVFMT_TS_NONSTRICT,

604 };

Generated on Sat Jan 25 2014 19:51:47 for FFmpeg by doxygen 1.8.2