FFmpeg: libavformat/flvenc.c Source File

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libavformat

flvenc.c

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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_VP6, FLV_CODECID_VP6 },

41 { AV_CODEC_ID_VP6A, FLV_CODECID_VP6A },

42 { AV_CODEC_ID_H264, FLV_CODECID_H264 },

43 { AV_CODEC_ID_NONE, 0 }

44 };

46 static const AVCodecTag flv_audio_codec_ids[] = {

47 { AV_CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET },

48 { AV_CODEC_ID_PCM_U8, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET },

49 { AV_CODEC_ID_PCM_S16BE, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET },

50 { AV_CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET },

51 { AV_CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM >> FLV_AUDIO_CODECID_OFFSET },

52 { AV_CODEC_ID_AAC, FLV_CODECID_AAC >> FLV_AUDIO_CODECID_OFFSET },

53 { AV_CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET },

54 { AV_CODEC_ID_PCM_MULAW, FLV_CODECID_PCM_MULAW >> FLV_AUDIO_CODECID_OFFSET },

55 { AV_CODEC_ID_PCM_ALAW, FLV_CODECID_PCM_ALAW >> FLV_AUDIO_CODECID_OFFSET },

56 { AV_CODEC_ID_SPEEX, FLV_CODECID_SPEEX >> FLV_AUDIO_CODECID_OFFSET },

57 { AV_CODEC_ID_NONE, 0 }

58 };

60 typedef struct FLVContext {

61 int reserved;

62 int64_t duration_offset;

63 int64_t filesize_offset;

64 int64_t duration;

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

66 } FLVContext;

68 typedef struct FLVStreamContext {

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

70 } FLVStreamContext;

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

73 {

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

75 : FLV_SAMPLESSIZE_8BIT;

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

78 return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ |

79 FLV_SAMPLESSIZE_16BIT | FLV_STEREO;

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

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

82 av_log(s, AV_LOG_ERROR,

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

84 return AVERROR(EINVAL);

85 }

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

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

88 return AVERROR(EINVAL);

89 }

90 return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;

91 } else {

92 switch (enc->sample_rate) {

93 case 44100:

94 flags |= FLV_SAMPLERATE_44100HZ;

95 break;

96 case 22050:

97 flags |= FLV_SAMPLERATE_22050HZ;

98 break;

99 case 11025:

100 flags |= FLV_SAMPLERATE_11025HZ;

101 break;

102 case 16000: // nellymoser only

103 case 8000: // nellymoser only

104 case 5512: // not MP3

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

106 flags |= FLV_SAMPLERATE_SPECIAL;

107 break;

108 }

109 default:

110 av_log(s, AV_LOG_ERROR,

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

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

113 return AVERROR(EINVAL);

114 }

115 }

116

117 if (enc->channels > 1)

118 flags |= FLV_STEREO;

119

120 switch (enc->codec_id) {

121 case AV_CODEC_ID_MP3:

122 flags |= FLV_CODECID_MP3 | FLV_SAMPLESSIZE_16BIT;

123 break;

124 case AV_CODEC_ID_PCM_U8:

125 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_8BIT;

126 break;

127 case AV_CODEC_ID_PCM_S16BE:

128 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_16BIT;

129 break;

130 case AV_CODEC_ID_PCM_S16LE:

131 flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;

132 break;

133 case AV_CODEC_ID_ADPCM_SWF:

134 flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT;

135 break;

136 case AV_CODEC_ID_NELLYMOSER:

137 if (enc->sample_rate == 8000)

138 flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT;

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

140 flags |= FLV_CODECID_NELLYMOSER_16KHZ_MONO | FLV_SAMPLESSIZE_16BIT;

141 else

142 flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;

143 break;

144 case AV_CODEC_ID_PCM_MULAW:

145 flags = FLV_CODECID_PCM_MULAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;

146 break;

147 case AV_CODEC_ID_PCM_ALAW:

148 flags = FLV_CODECID_PCM_ALAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;

149 break;

150 case 0:

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

152 break;

153 default:

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

155 avcodec_get_name(enc->codec_id));

156 return AVERROR(EINVAL);

157 }

158

159 return flags;

160 }

161

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

163 {

164 size_t len = strlen(str);

165 avio_wb16(pb, len);

166 avio_write(pb, str, len);

167 }

168

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

170 {

171 avio_w8(pb, FLV_TAG_TYPE_VIDEO);

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

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

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

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

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

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

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

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

180 }

181

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

183 {

184 avio_w8(pb, AMF_DATA_TYPE_NUMBER);

185 avio_wb64(pb, av_double2int(d));

186 }

187

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

189 {

190 avio_w8(pb, AMF_DATA_TYPE_BOOL);

191 avio_w8(pb, !!b);

192 }

193

194 static int flv_write_header(AVFormatContext *s)

195 {

196 AVIOContext *pb = s->pb;

197 FLVContext *flv = s->priv_data;

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

199 int i, metadata_count = 0;

200 double framerate = 0.0;

201 int64_t metadata_size_pos, data_size, metadata_count_pos;

202 AVDictionaryEntry *tag = NULL;

203

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

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

206 FLVStreamContext *sc;

207 switch (enc->codec_type) {

208 case AVMEDIA_TYPE_VIDEO:

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

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

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

212 } else {

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

214 }

215 if (video_enc) {

216 av_log(s, AV_LOG_ERROR,

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

218 return AVERROR(EINVAL);

219 }

220 video_enc = enc;

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

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

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

224 return AVERROR(EINVAL);

225 }

226 break;

227 case AVMEDIA_TYPE_AUDIO:

228 if (audio_enc) {

229 av_log(s, AV_LOG_ERROR,

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

231 return AVERROR(EINVAL);

232 }

233 audio_enc = enc;

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

235 return AVERROR_INVALIDDATA;

236 break;

237 case AVMEDIA_TYPE_DATA:

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

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

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

241 return AVERROR_INVALIDDATA;

242 }

243 data_enc = enc;

244 break;

245 default:

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

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

248 return AVERROR(EINVAL);

249 }

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

251

252 sc = av_mallocz(sizeof(FLVStreamContext));

253 if (!sc)

254 return AVERROR(ENOMEM);

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

256 sc->last_ts = -1;

257 }

258

259 flv->delay = AV_NOPTS_VALUE;

260

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

262 avio_w8(pb, 1);

263 avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!audio_enc +

264 FLV_HEADER_FLAG_HASVIDEO * !!video_enc);

265 avio_wb32(pb, 9);

266 avio_wb32(pb, 0);

267

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

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

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

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

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

273 avio_wb32(pb, 0); // reserved

274 avio_wb32(pb, 11); // size

275 flv->reserved = 5;

276 }

277

278 /* write meta_tag */

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

280 metadata_size_pos = avio_tell(pb);

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

282 avio_wb24(pb, 0); // timestamp

283 avio_wb32(pb, 0); // reserved

284

285 /* now data of data_size size */

286

287 /* first event name as a string */

288 avio_w8(pb, AMF_DATA_TYPE_STRING);

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

290

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

292 avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);

293 metadata_count_pos = avio_tell(pb);

294 metadata_count = 5 * !!video_enc +

295 5 * !!audio_enc +

296 1 * !!data_enc +

297 2; // +2 for duration and file size

298

299 avio_wb32(pb, metadata_count);

300

301 put_amf_string(pb, "duration");

302 flv->duration_offset= avio_tell(pb);

303

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

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

306

307 if (video_enc) {

308 put_amf_string(pb, "width");

309 put_amf_double(pb, video_enc->width);

310

311 put_amf_string(pb, "height");

312 put_amf_double(pb, video_enc->height);

313

314 put_amf_string(pb, "videodatarate");

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

316

317 put_amf_string(pb, "framerate");

318 put_amf_double(pb, framerate);

319

320 put_amf_string(pb, "videocodecid");

321 put_amf_double(pb, video_enc->codec_tag);

322 }

323

324 if (audio_enc) {

325 put_amf_string(pb, "audiodatarate");

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

327

328 put_amf_string(pb, "audiosamplerate");

329 put_amf_double(pb, audio_enc->sample_rate);

330

331 put_amf_string(pb, "audiosamplesize");

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

333

334 put_amf_string(pb, "stereo");

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

336

337 put_amf_string(pb, "audiocodecid");

338 put_amf_double(pb, audio_enc->codec_tag);

339 }

340

341 if (data_enc) {

342 put_amf_string(pb, "datastream");

343 put_amf_double(pb, 0.0);

344 }

345

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

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

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

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

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

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

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

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

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

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

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

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

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

359 ){

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

361 continue;

362 }

363 put_amf_string(pb, tag->key);

364 avio_w8(pb, AMF_DATA_TYPE_STRING);

365 put_amf_string(pb, tag->value);

366 metadata_count++;

367 }

368

369 put_amf_string(pb, "filesize");

370 flv->filesize_offset = avio_tell(pb);

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

372

373 put_amf_string(pb, "");

374 avio_w8(pb, AMF_END_OF_OBJECT);

375

376 /* write total size of tag */

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

378

379 avio_seek(pb, metadata_count_pos, SEEK_SET);

380 avio_wb32(pb, metadata_count);

381

382 avio_seek(pb, metadata_size_pos, SEEK_SET);

383 avio_wb24(pb, data_size);

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

385 avio_wb32(pb, data_size + 11);

386

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

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

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

390 int64_t pos;

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

392 FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);

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

394 avio_wb24(pb, 0); // ts

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

396 avio_wb24(pb, 0); // streamid

397 pos = avio_tell(pb);

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

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

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

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

402 } else {

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

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

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

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

407 }

408 data_size = avio_tell(pb) - pos;

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

410 avio_wb24(pb, data_size);

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

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

413 }

414 }

415

416 return 0;

417 }

418

419 static int flv_write_trailer(AVFormatContext *s)

420 {

421 int64_t file_size;

422

423 AVIOContext *pb = s->pb;

424 FLVContext *flv = s->priv_data;

425 int i;

426

427 /* Add EOS tag */

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

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

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

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

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

433 put_avc_eos_tag(pb, sc->last_ts);

434 }

435

436 file_size = avio_tell(pb);

437

438 /* update information */

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

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

441 else

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

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

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

445 else

446 put_amf_double(pb, file_size);

447

448 avio_seek(pb, file_size, SEEK_SET);

449 return 0;

450 }

451

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

453 {

454 AVIOContext *pb = s->pb;

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

456 FLVContext *flv = s->priv_data;

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

458 unsigned ts;

459 int size = pkt->size;

460 uint8_t *data = NULL;

461 int flags = -1, flags_size, ret;

462

463 if (enc->codec_id == AV_CODEC_ID_VP6 || enc->codec_id == AV_CODEC_ID_VP6F ||

464 enc->codec_id == AV_CODEC_ID_VP6A || enc->codec_id == AV_CODEC_ID_AAC)

465 flags_size = 2;

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

467 flags_size = 5;

468 else

469 flags_size = 1;

470

471 switch (enc->codec_type) {

472 case AVMEDIA_TYPE_VIDEO:

473 avio_w8(pb, FLV_TAG_TYPE_VIDEO);

474

475 flags = enc->codec_tag;

476 if (flags == 0) {

477 av_log(s, AV_LOG_ERROR,

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

479 avcodec_get_name(enc->codec_id));

480 return AVERROR(EINVAL);

481 }

482

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

484 break;

485 case AVMEDIA_TYPE_AUDIO:

486 flags = get_audio_flags(s, enc);

487

488 av_assert0(size);

489

490 avio_w8(pb, FLV_TAG_TYPE_AUDIO);

491 break;

492 case AVMEDIA_TYPE_DATA:

493 avio_w8(pb, FLV_TAG_TYPE_META);

494 break;

495 default:

496 return AVERROR(EINVAL);

497 }

498

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

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

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

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

503 return ret;

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

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

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

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

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

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

510 return AVERROR_INVALIDDATA;

511 }

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

513 }

514

515 if (flv->delay == AV_NOPTS_VALUE)

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

517

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

519 av_log(s, AV_LOG_WARNING,

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

521 return AVERROR(EINVAL);

522 }

523

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

525

526 /* check Speex packet duration */

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

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

529 "8 frames per packet. Adobe Flash "

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

531

532 if (sc->last_ts < ts)

533 sc->last_ts = ts;

534

535 avio_wb24(pb, size + flags_size);

536 avio_wb24(pb, ts);

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

538 avio_wb24(pb, flv->reserved);

539

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

541 int data_size;

542 int metadata_size_pos = avio_tell(pb);

543 avio_w8(pb, AMF_DATA_TYPE_STRING);

544 put_amf_string(pb, "onTextData");

545 avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);

546 avio_wb32(pb, 2);

547 put_amf_string(pb, "type");

548 avio_w8(pb, AMF_DATA_TYPE_STRING);

549 put_amf_string(pb, "Text");

550 put_amf_string(pb, "text");

551 avio_w8(pb, AMF_DATA_TYPE_STRING);

552 put_amf_string(pb, pkt->data);

553 put_amf_string(pb, "");

554 avio_w8(pb, AMF_END_OF_OBJECT);

555 /* write total size of tag */

556 data_size = avio_tell(pb) - metadata_size_pos;

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

558 avio_wb24(pb, data_size);

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

560 avio_wb32(pb, data_size + 11);

561 } else {

562 av_assert1(flags>=0);

563 avio_w8(pb,flags);

564 if (enc->codec_id == AV_CODEC_ID_VP6)

565 avio_w8(pb,0);

566 if (enc->codec_id == AV_CODEC_ID_VP6F || enc->codec_id == AV_CODEC_ID_VP6A)

567 avio_w8(pb, enc->extradata_size ? enc->extradata[0] : 0);

568 else if (enc->codec_id == AV_CODEC_ID_AAC)

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

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

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

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

573 }

574

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

576

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

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

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

580 }

581

582 av_free(data);

583

584 return pb->error;

585 }

586

587 AVOutputFormat ff_flv_muxer = {

588 .name = "flv",

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

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

591 .extensions = "flv",

592 .priv_data_size = sizeof(FLVContext),

593 .audio_codec = CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_ADPCM_SWF,

594 .video_codec = AV_CODEC_ID_FLV1,

595 .write_header = flv_write_header,

596 .write_packet = flv_write_packet,

597 .write_trailer = flv_write_trailer,

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

599 flv_video_codec_ids, flv_audio_codec_ids, 0

600 },

601 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |

602 AVFMT_TS_NONSTRICT,

603 };

Generated on Wed Jul 10 2013 23:47:58 for FFmpeg by doxygen 1.8.2