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  1. /*
  2. * FLV muxer
  3. * Copyright (c) 2003 The FFmpeg Project
  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. */
  21. #include "libavutil/intreadwrite.h"
  22. #include "libavutil/dict.h"
  23. #include "libavutil/intfloat.h"
  24. #include "libavutil/avassert.h"
  25. #include "avc.h"
  26. #include "avformat.h"
  27. #include "flv.h"
  28. #include "internal.h"
  29. #include "metadata.h"
  30. static const AVCodecTag flv_video_codec_ids[] = {
  31. { AV_CODEC_ID_FLV1, FLV_CODECID_H263 },
  32. { AV_CODEC_ID_H263, FLV_CODECID_REALH263 },
  33. { AV_CODEC_ID_MPEG4, FLV_CODECID_MPEG4 },
  34. { AV_CODEC_ID_FLASHSV, FLV_CODECID_SCREEN },
  35. { AV_CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2 },
  36. { AV_CODEC_ID_VP6F, FLV_CODECID_VP6 },
  37. { AV_CODEC_ID_VP6, FLV_CODECID_VP6 },
  38. { AV_CODEC_ID_VP6A, FLV_CODECID_VP6A },
  39. { AV_CODEC_ID_H264, FLV_CODECID_H264 },
  40. { AV_CODEC_ID_NONE, 0 }
  41. };
  42. static const AVCodecTag flv_audio_codec_ids[] = {
  43. { AV_CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET },
  44. { AV_CODEC_ID_PCM_U8, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET },
  45. { AV_CODEC_ID_PCM_S16BE, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET },
  46. { AV_CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET },
  47. { AV_CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM >> FLV_AUDIO_CODECID_OFFSET },
  48. { AV_CODEC_ID_AAC, FLV_CODECID_AAC >> FLV_AUDIO_CODECID_OFFSET },
  49. { AV_CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET },
  50. { AV_CODEC_ID_PCM_MULAW, FLV_CODECID_PCM_MULAW >> FLV_AUDIO_CODECID_OFFSET },
  51. { AV_CODEC_ID_PCM_ALAW, FLV_CODECID_PCM_ALAW >> FLV_AUDIO_CODECID_OFFSET },
  52. { AV_CODEC_ID_SPEEX, FLV_CODECID_SPEEX >> FLV_AUDIO_CODECID_OFFSET },
  53. { AV_CODEC_ID_NONE, 0 }
  54. };
  55. typedef struct FLVContext {
  56. int reserved;
  57. int64_t duration_offset;
  58. int64_t filesize_offset;
  59. int64_t duration;
  60. int64_t delay; ///< first dts delay (needed for AVC & Speex)
  61. AVCodecContext *audio_enc;
  62. AVCodecContext *video_enc;
  63. double framerate;
  64. AVCodecContext *data_enc;
  65. } FLVContext;
  66. typedef struct FLVStreamContext {
  67. int64_t last_ts; ///< last timestamp for each stream
  68. } FLVStreamContext;
  69. static int get_audio_flags(AVFormatContext *s, AVCodecContext *enc)
  70. {
  71. int flags = (enc->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT
  72. : FLV_SAMPLESSIZE_8BIT;
  73. if (enc->codec_id == AV_CODEC_ID_AAC) // specs force these parameters
  74. return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ |
  75. FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
  76. else if (enc->codec_id == AV_CODEC_ID_SPEEX) {
  77. if (enc->sample_rate != 16000) {
  78. av_log(s, AV_LOG_ERROR,
  79. "FLV only supports wideband (16kHz) Speex audio\n");
  80. return AVERROR(EINVAL);
  81. }
  82. if (enc->channels != 1) {
  83. av_log(s, AV_LOG_ERROR, "FLV only supports mono Speex audio\n");
  84. return AVERROR(EINVAL);
  85. }
  86. return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;
  87. } else {
  88. switch (enc->sample_rate) {
  89. case 44100:
  90. flags |= FLV_SAMPLERATE_44100HZ;
  91. break;
  92. case 22050:
  93. flags |= FLV_SAMPLERATE_22050HZ;
  94. break;
  95. case 11025:
  96. flags |= FLV_SAMPLERATE_11025HZ;
  97. break;
  98. case 16000: // nellymoser only
  99. case 8000: // nellymoser only
  100. case 5512: // not MP3
  101. if (enc->codec_id != AV_CODEC_ID_MP3) {
  102. flags |= FLV_SAMPLERATE_SPECIAL;
  103. break;
  104. }
  105. default:
  106. av_log(s, AV_LOG_ERROR,
  107. "FLV does not support sample rate %d, "
  108. "choose from (44100, 22050, 11025)\n", enc->sample_rate);
  109. return AVERROR(EINVAL);
  110. }
  111. }
  112. if (enc->channels > 1)
  113. flags |= FLV_STEREO;
  114. switch (enc->codec_id) {
  115. case AV_CODEC_ID_MP3:
  116. flags |= FLV_CODECID_MP3 | FLV_SAMPLESSIZE_16BIT;
  117. break;
  118. case AV_CODEC_ID_PCM_U8:
  119. flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_8BIT;
  120. break;
  121. case AV_CODEC_ID_PCM_S16BE:
  122. flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_16BIT;
  123. break;
  124. case AV_CODEC_ID_PCM_S16LE:
  125. flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
  126. break;
  127. case AV_CODEC_ID_ADPCM_SWF:
  128. flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT;
  129. break;
  130. case AV_CODEC_ID_NELLYMOSER:
  131. if (enc->sample_rate == 8000)
  132. flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
  133. else if (enc->sample_rate == 16000)
  134. flags |= FLV_CODECID_NELLYMOSER_16KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
  135. else
  136. flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;
  137. break;
  138. case AV_CODEC_ID_PCM_MULAW:
  139. flags = FLV_CODECID_PCM_MULAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
  140. break;
  141. case AV_CODEC_ID_PCM_ALAW:
  142. flags = FLV_CODECID_PCM_ALAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
  143. break;
  144. case 0:
  145. flags |= enc->codec_tag << 4;
  146. break;
  147. default:
  148. av_log(s, AV_LOG_ERROR, "Audio codec '%s' not compatible with FLV\n",
  149. avcodec_get_name(enc->codec_id));
  150. return AVERROR(EINVAL);
  151. }
  152. return flags;
  153. }
  154. static void put_amf_string(AVIOContext *pb, const char *str)
  155. {
  156. size_t len = strlen(str);
  157. avio_wb16(pb, len);
  158. avio_write(pb, str, len);
  159. }
  160. static void put_avc_eos_tag(AVIOContext *pb, unsigned ts)
  161. {
  162. avio_w8(pb, FLV_TAG_TYPE_VIDEO);
  163. avio_wb24(pb, 5); /* Tag Data Size */
  164. avio_wb24(pb, ts); /* lower 24 bits of timestamp in ms */
  165. avio_w8(pb, (ts >> 24) & 0x7F); /* MSB of ts in ms */
  166. avio_wb24(pb, 0); /* StreamId = 0 */
  167. avio_w8(pb, 23); /* ub[4] FrameType = 1, ub[4] CodecId = 7 */
  168. avio_w8(pb, 2); /* AVC end of sequence */
  169. avio_wb24(pb, 0); /* Always 0 for AVC EOS. */
  170. avio_wb32(pb, 16); /* Size of FLV tag */
  171. }
  172. static void put_amf_double(AVIOContext *pb, double d)
  173. {
  174. avio_w8(pb, AMF_DATA_TYPE_NUMBER);
  175. avio_wb64(pb, av_double2int(d));
  176. }
  177. static void put_amf_bool(AVIOContext *pb, int b)
  178. {
  179. avio_w8(pb, AMF_DATA_TYPE_BOOL);
  180. avio_w8(pb, !!b);
  181. }
  182. static void write_metadata(AVFormatContext *s, unsigned int ts)
  183. {
  184. AVIOContext *pb = s->pb;
  185. FLVContext *flv = s->priv_data;
  186. int metadata_count = 0;
  187. int64_t metadata_size_pos, data_size, metadata_count_pos;
  188. AVDictionaryEntry *tag = NULL;
  189. /* write meta_tag */
  190. avio_w8(pb, 18); // tag type META
  191. metadata_size_pos = avio_tell(pb);
  192. avio_wb24(pb, 0); // size of data part (sum of all parts below)
  193. avio_wb24(pb, ts); // timestamp
  194. avio_wb32(pb, 0); // reserved
  195. /* now data of data_size size */
  196. /* first event name as a string */
  197. avio_w8(pb, AMF_DATA_TYPE_STRING);
  198. put_amf_string(pb, "onMetaData"); // 12 bytes
  199. /* mixed array (hash) with size and string/type/data tuples */
  200. avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
  201. metadata_count_pos = avio_tell(pb);
  202. metadata_count = 4 * !!flv->video_enc +
  203. 5 * !!flv->audio_enc +
  204. 1 * !!flv->data_enc +
  205. 2; // +2 for duration and file size
  206. avio_wb32(pb, metadata_count);
  207. put_amf_string(pb, "duration");
  208. flv->duration_offset = avio_tell(pb);
  209. // fill in the guessed duration, it'll be corrected later if incorrect
  210. put_amf_double(pb, s->duration / AV_TIME_BASE);
  211. if (flv->video_enc) {
  212. put_amf_string(pb, "width");
  213. put_amf_double(pb, flv->video_enc->width);
  214. put_amf_string(pb, "height");
  215. put_amf_double(pb, flv->video_enc->height);
  216. put_amf_string(pb, "videodatarate");
  217. put_amf_double(pb, flv->video_enc->bit_rate / 1024.0);
  218. if (flv->framerate != 0.0) {
  219. put_amf_string(pb, "framerate");
  220. put_amf_double(pb, flv->framerate);
  221. metadata_count++;
  222. }
  223. put_amf_string(pb, "videocodecid");
  224. put_amf_double(pb, flv->video_enc->codec_tag);
  225. }
  226. if (flv->audio_enc) {
  227. put_amf_string(pb, "audiodatarate");
  228. put_amf_double(pb, flv->audio_enc->bit_rate / 1024.0);
  229. put_amf_string(pb, "audiosamplerate");
  230. put_amf_double(pb, flv->audio_enc->sample_rate);
  231. put_amf_string(pb, "audiosamplesize");
  232. put_amf_double(pb, flv->audio_enc->codec_id == AV_CODEC_ID_PCM_U8 ? 8 : 16);
  233. put_amf_string(pb, "stereo");
  234. put_amf_bool(pb, flv->audio_enc->channels == 2);
  235. put_amf_string(pb, "audiocodecid");
  236. put_amf_double(pb, flv->audio_enc->codec_tag);
  237. }
  238. if (flv->data_enc) {
  239. put_amf_string(pb, "datastream");
  240. put_amf_double(pb, 0.0);
  241. }
  242. while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
  243. if( !strcmp(tag->key, "width")
  244. ||!strcmp(tag->key, "height")
  245. ||!strcmp(tag->key, "videodatarate")
  246. ||!strcmp(tag->key, "framerate")
  247. ||!strcmp(tag->key, "videocodecid")
  248. ||!strcmp(tag->key, "audiodatarate")
  249. ||!strcmp(tag->key, "audiosamplerate")
  250. ||!strcmp(tag->key, "audiosamplesize")
  251. ||!strcmp(tag->key, "stereo")
  252. ||!strcmp(tag->key, "audiocodecid")
  253. ||!strcmp(tag->key, "duration")
  254. ||!strcmp(tag->key, "onMetaData")
  255. ||!strcmp(tag->key, "datasize")
  256. ||!strcmp(tag->key, "lasttimestamp")
  257. ||!strcmp(tag->key, "totalframes")
  258. ||!strcmp(tag->key, "hasAudio")
  259. ||!strcmp(tag->key, "hasVideo")
  260. ||!strcmp(tag->key, "hasCuePoints")
  261. ||!strcmp(tag->key, "hasMetadata")
  262. ||!strcmp(tag->key, "hasKeyframes")
  263. ){
  264. av_log(s, AV_LOG_DEBUG, "Ignoring metadata for %s\n", tag->key);
  265. continue;
  266. }
  267. put_amf_string(pb, tag->key);
  268. avio_w8(pb, AMF_DATA_TYPE_STRING);
  269. put_amf_string(pb, tag->value);
  270. metadata_count++;
  271. }
  272. put_amf_string(pb, "filesize");
  273. flv->filesize_offset = avio_tell(pb);
  274. put_amf_double(pb, 0); // delayed write
  275. put_amf_string(pb, "");
  276. avio_w8(pb, AMF_END_OF_OBJECT);
  277. /* write total size of tag */
  278. data_size = avio_tell(pb) - metadata_size_pos - 10;
  279. avio_seek(pb, metadata_count_pos, SEEK_SET);
  280. avio_wb32(pb, metadata_count);
  281. avio_seek(pb, metadata_size_pos, SEEK_SET);
  282. avio_wb24(pb, data_size);
  283. avio_skip(pb, data_size + 10 - 3);
  284. avio_wb32(pb, data_size + 11);
  285. }
  286. static int flv_write_header(AVFormatContext *s)
  287. {
  288. int i;
  289. AVIOContext *pb = s->pb;
  290. FLVContext *flv = s->priv_data;
  291. int64_t data_size;
  292. for (i = 0; i < s->nb_streams; i++) {
  293. AVCodecContext *enc = s->streams[i]->codec;
  294. FLVStreamContext *sc;
  295. switch (enc->codec_type) {
  296. case AVMEDIA_TYPE_VIDEO:
  297. if (s->streams[i]->avg_frame_rate.den &&
  298. s->streams[i]->avg_frame_rate.num) {
  299. flv->framerate = av_q2d(s->streams[i]->avg_frame_rate);
  300. }
  301. if (flv->video_enc) {
  302. av_log(s, AV_LOG_ERROR,
  303. "at most one video stream is supported in flv\n");
  304. return AVERROR(EINVAL);
  305. }
  306. flv->video_enc = enc;
  307. if (enc->codec_tag == 0) {
  308. av_log(s, AV_LOG_ERROR, "Video codec '%s' for stream %d is not compatible with FLV\n",
  309. avcodec_get_name(enc->codec_id), i);
  310. return AVERROR(EINVAL);
  311. }
  312. if (enc->codec_id == AV_CODEC_ID_MPEG4 ||
  313. enc->codec_id == AV_CODEC_ID_H263) {
  314. int error = s->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL;
  315. av_log(s, error ? AV_LOG_ERROR : AV_LOG_WARNING,
  316. "Codec %s is not supported in the official FLV specification,\n", avcodec_get_name(enc->codec_id));
  317. if (error) {
  318. av_log(s, AV_LOG_ERROR,
  319. "use vstrict=-1 / -strict -1 to use it anyway.\n");
  320. return AVERROR(EINVAL);
  321. }
  322. } else if (enc->codec_id == AV_CODEC_ID_VP6) {
  323. av_log(s, AV_LOG_WARNING,
  324. "Muxing VP6 in flv will produce flipped video on playback.\n");
  325. }
  326. break;
  327. case AVMEDIA_TYPE_AUDIO:
  328. if (flv->audio_enc) {
  329. av_log(s, AV_LOG_ERROR,
  330. "at most one audio stream is supported in flv\n");
  331. return AVERROR(EINVAL);
  332. }
  333. flv->audio_enc = enc;
  334. if (get_audio_flags(s, enc) < 0)
  335. return AVERROR_INVALIDDATA;
  336. if (enc->codec_id == AV_CODEC_ID_PCM_S16BE)
  337. av_log(s, AV_LOG_WARNING,
  338. "16-bit big-endian audio in flv is valid but most likely unplayable (hardware dependent); use s16le\n");
  339. break;
  340. case AVMEDIA_TYPE_DATA:
  341. if (enc->codec_id != AV_CODEC_ID_TEXT && enc->codec_id != AV_CODEC_ID_NONE) {
  342. av_log(s, AV_LOG_ERROR, "Data codec '%s' for stream %d is not compatible with FLV\n",
  343. avcodec_get_name(enc->codec_id), i);
  344. return AVERROR_INVALIDDATA;
  345. }
  346. flv->data_enc = enc;
  347. break;
  348. default:
  349. av_log(s, AV_LOG_ERROR, "Codec type '%s' for stream %d is not compatible with FLV\n",
  350. av_get_media_type_string(enc->codec_type), i);
  351. return AVERROR(EINVAL);
  352. }
  353. avpriv_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
  354. sc = av_mallocz(sizeof(FLVStreamContext));
  355. if (!sc)
  356. return AVERROR(ENOMEM);
  357. s->streams[i]->priv_data = sc;
  358. sc->last_ts = -1;
  359. }
  360. flv->delay = AV_NOPTS_VALUE;
  361. avio_write(pb, "FLV", 3);
  362. avio_w8(pb, 1);
  363. avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!flv->audio_enc +
  364. FLV_HEADER_FLAG_HASVIDEO * !!flv->video_enc);
  365. avio_wb32(pb, 9);
  366. avio_wb32(pb, 0);
  367. for (i = 0; i < s->nb_streams; i++)
  368. if (s->streams[i]->codec->codec_tag == 5) {
  369. avio_w8(pb, 8); // message type
  370. avio_wb24(pb, 0); // include flags
  371. avio_wb24(pb, 0); // time stamp
  372. avio_wb32(pb, 0); // reserved
  373. avio_wb32(pb, 11); // size
  374. flv->reserved = 5;
  375. }
  376. write_metadata(s, 0);
  377. for (i = 0; i < s->nb_streams; i++) {
  378. AVCodecContext *enc = s->streams[i]->codec;
  379. if (enc->codec_id == AV_CODEC_ID_AAC || enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4) {
  380. int64_t pos;
  381. avio_w8(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO ?
  382. FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
  383. avio_wb24(pb, 0); // size patched later
  384. avio_wb24(pb, 0); // ts
  385. avio_w8(pb, 0); // ts ext
  386. avio_wb24(pb, 0); // streamid
  387. pos = avio_tell(pb);
  388. if (enc->codec_id == AV_CODEC_ID_AAC) {
  389. avio_w8(pb, get_audio_flags(s, enc));
  390. avio_w8(pb, 0); // AAC sequence header
  391. avio_write(pb, enc->extradata, enc->extradata_size);
  392. } else {
  393. avio_w8(pb, enc->codec_tag | FLV_FRAME_KEY); // flags
  394. avio_w8(pb, 0); // AVC sequence header
  395. avio_wb24(pb, 0); // composition time
  396. ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size);
  397. }
  398. data_size = avio_tell(pb) - pos;
  399. avio_seek(pb, -data_size - 10, SEEK_CUR);
  400. avio_wb24(pb, data_size);
  401. avio_skip(pb, data_size + 10 - 3);
  402. avio_wb32(pb, data_size + 11); // previous tag size
  403. }
  404. }
  405. return 0;
  406. }
  407. static int flv_write_trailer(AVFormatContext *s)
  408. {
  409. int64_t file_size;
  410. AVIOContext *pb = s->pb;
  411. FLVContext *flv = s->priv_data;
  412. int i;
  413. /* Add EOS tag */
  414. for (i = 0; i < s->nb_streams; i++) {
  415. AVCodecContext *enc = s->streams[i]->codec;
  416. FLVStreamContext *sc = s->streams[i]->priv_data;
  417. if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&
  418. (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4))
  419. put_avc_eos_tag(pb, sc->last_ts);
  420. }
  421. file_size = avio_tell(pb);
  422. /* update information */
  423. if (avio_seek(pb, flv->duration_offset, SEEK_SET) < 0)
  424. av_log(s, AV_LOG_WARNING, "Failed to update header with correct duration.\n");
  425. else
  426. put_amf_double(pb, flv->duration / (double)1000);
  427. if (avio_seek(pb, flv->filesize_offset, SEEK_SET) < 0)
  428. av_log(s, AV_LOG_WARNING, "Failed to update header with correct filesize.\n");
  429. else
  430. put_amf_double(pb, file_size);
  431. avio_seek(pb, file_size, SEEK_SET);
  432. return 0;
  433. }
  434. static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
  435. {
  436. AVIOContext *pb = s->pb;
  437. AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
  438. FLVContext *flv = s->priv_data;
  439. FLVStreamContext *sc = s->streams[pkt->stream_index]->priv_data;
  440. unsigned ts;
  441. int size = pkt->size;
  442. uint8_t *data = NULL;
  443. int flags = -1, flags_size, ret;
  444. if (enc->codec_id == AV_CODEC_ID_VP6F || enc->codec_id == AV_CODEC_ID_VP6A ||
  445. enc->codec_id == AV_CODEC_ID_VP6 || enc->codec_id == AV_CODEC_ID_AAC)
  446. flags_size = 2;
  447. else if (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4)
  448. flags_size = 5;
  449. else
  450. flags_size = 1;
  451. if (flv->delay == AV_NOPTS_VALUE)
  452. flv->delay = -pkt->dts;
  453. if (pkt->dts < -flv->delay) {
  454. av_log(s, AV_LOG_WARNING,
  455. "Packets are not in the proper order with respect to DTS\n");
  456. return AVERROR(EINVAL);
  457. }
  458. ts = pkt->dts + flv->delay; // add delay to force positive dts
  459. if (s->event_flags & AVSTREAM_EVENT_FLAG_METADATA_UPDATED) {
  460. write_metadata(s, ts);
  461. s->event_flags &= ~AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
  462. }
  463. switch (enc->codec_type) {
  464. case AVMEDIA_TYPE_VIDEO:
  465. avio_w8(pb, FLV_TAG_TYPE_VIDEO);
  466. flags = enc->codec_tag;
  467. if (flags == 0) {
  468. av_log(s, AV_LOG_ERROR,
  469. "Video codec '%s' is not compatible with FLV\n",
  470. avcodec_get_name(enc->codec_id));
  471. return AVERROR(EINVAL);
  472. }
  473. flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
  474. break;
  475. case AVMEDIA_TYPE_AUDIO:
  476. flags = get_audio_flags(s, enc);
  477. av_assert0(size);
  478. avio_w8(pb, FLV_TAG_TYPE_AUDIO);
  479. break;
  480. case AVMEDIA_TYPE_DATA:
  481. avio_w8(pb, FLV_TAG_TYPE_META);
  482. break;
  483. default:
  484. return AVERROR(EINVAL);
  485. }
  486. if (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4) {
  487. /* check if extradata looks like mp4 formated */
  488. if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1)
  489. if ((ret = ff_avc_parse_nal_units_buf(pkt->data, &data, &size)) < 0)
  490. return ret;
  491. } else if (enc->codec_id == AV_CODEC_ID_AAC && pkt->size > 2 &&
  492. (AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
  493. if (!s->streams[pkt->stream_index]->nb_frames) {
  494. av_log(s, AV_LOG_ERROR, "Malformed AAC bitstream detected: "
  495. "use the audio bitstream filter 'aac_adtstoasc' to fix it "
  496. "('-bsf:a aac_adtstoasc' option with ffmpeg)\n");
  497. return AVERROR_INVALIDDATA;
  498. }
  499. av_log(s, AV_LOG_WARNING, "aac bitstream error\n");
  500. }
  501. /* check Speex packet duration */
  502. if (enc->codec_id == AV_CODEC_ID_SPEEX && ts - sc->last_ts > 160)
  503. av_log(s, AV_LOG_WARNING, "Warning: Speex stream has more than "
  504. "8 frames per packet. Adobe Flash "
  505. "Player cannot handle this!\n");
  506. if (sc->last_ts < ts)
  507. sc->last_ts = ts;
  508. if (size + flags_size >= 1<<24) {
  509. av_log(s, AV_LOG_ERROR, "Too large packet with size %u >= %u\n",
  510. size + flags_size, 1<<24);
  511. return AVERROR(EINVAL);
  512. }
  513. avio_wb24(pb, size + flags_size);
  514. avio_wb24(pb, ts & 0xFFFFFF);
  515. avio_w8(pb, (ts >> 24) & 0x7F); // timestamps are 32 bits _signed_
  516. avio_wb24(pb, flv->reserved);
  517. if (enc->codec_type == AVMEDIA_TYPE_DATA) {
  518. int data_size;
  519. int64_t metadata_size_pos = avio_tell(pb);
  520. if (enc->codec_id == AV_CODEC_ID_TEXT) {
  521. // legacy FFmpeg magic?
  522. avio_w8(pb, AMF_DATA_TYPE_STRING);
  523. put_amf_string(pb, "onTextData");
  524. avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
  525. avio_wb32(pb, 2);
  526. put_amf_string(pb, "type");
  527. avio_w8(pb, AMF_DATA_TYPE_STRING);
  528. put_amf_string(pb, "Text");
  529. put_amf_string(pb, "text");
  530. avio_w8(pb, AMF_DATA_TYPE_STRING);
  531. put_amf_string(pb, pkt->data);
  532. put_amf_string(pb, "");
  533. avio_w8(pb, AMF_END_OF_OBJECT);
  534. } else {
  535. // just pass the metadata through
  536. avio_write(pb, data ? data : pkt->data, size);
  537. }
  538. /* write total size of tag */
  539. data_size = avio_tell(pb) - metadata_size_pos;
  540. avio_seek(pb, metadata_size_pos - 10, SEEK_SET);
  541. avio_wb24(pb, data_size);
  542. avio_seek(pb, data_size + 10 - 3, SEEK_CUR);
  543. avio_wb32(pb, data_size + 11);
  544. } else {
  545. av_assert1(flags>=0);
  546. avio_w8(pb,flags);
  547. if (enc->codec_id == AV_CODEC_ID_VP6)
  548. avio_w8(pb,0);
  549. if (enc->codec_id == AV_CODEC_ID_VP6F || enc->codec_id == AV_CODEC_ID_VP6A) {
  550. if (enc->extradata_size)
  551. avio_w8(pb, enc->extradata[0]);
  552. else
  553. avio_w8(pb, ((FFALIGN(enc->width, 16) - enc->width) << 4) |
  554. (FFALIGN(enc->height, 16) - enc->height));
  555. } else if (enc->codec_id == AV_CODEC_ID_AAC)
  556. avio_w8(pb, 1); // AAC raw
  557. else if (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4) {
  558. avio_w8(pb, 1); // AVC NALU
  559. avio_wb24(pb, pkt->pts - pkt->dts);
  560. }
  561. avio_write(pb, data ? data : pkt->data, size);
  562. avio_wb32(pb, size + flags_size + 11); // previous tag size
  563. flv->duration = FFMAX(flv->duration,
  564. pkt->pts + flv->delay + pkt->duration);
  565. }
  566. av_free(data);
  567. return pb->error;
  568. }
  569. AVOutputFormat ff_flv_muxer = {
  570. .name = "flv",
  571. .long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
  572. .mime_type = "video/x-flv",
  573. .extensions = "flv",
  574. .priv_data_size = sizeof(FLVContext),
  575. .audio_codec = CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_ADPCM_SWF,
  576. .video_codec = AV_CODEC_ID_FLV1,
  577. .write_header = flv_write_header,
  578. .write_packet = flv_write_packet,
  579. .write_trailer = flv_write_trailer,
  580. .codec_tag = (const AVCodecTag* const []) {
  581. flv_video_codec_ids, flv_audio_codec_ids, 0
  582. },
  583. .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
  584. AVFMT_TS_NONSTRICT,
  585. };