3 * Copyright (c) 2003 The FFmpeg Project
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/intreadwrite.h"
23 #include "libavutil/dict.h"
24 #include "libavutil/intfloat.h"
25 #include "libavutil/avassert.h"
26 #include "libavutil/mathematics.h"
27 #include "avio_internal.h"
34 #include "libavutil/opt.h"
35 #include "libavcodec/put_bits.h"
36 #include "libavcodec/aacenctab.h"
39 static const AVCodecTag flv_video_codec_ids[] = {
40 { AV_CODEC_ID_FLV1, FLV_CODECID_H263 },
41 { AV_CODEC_ID_H263, FLV_CODECID_REALH263 },
42 { AV_CODEC_ID_MPEG4, FLV_CODECID_MPEG4 },
43 { AV_CODEC_ID_FLASHSV, FLV_CODECID_SCREEN },
44 { AV_CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2 },
45 { AV_CODEC_ID_VP6F, FLV_CODECID_VP6 },
46 { AV_CODEC_ID_VP6, FLV_CODECID_VP6 },
47 { AV_CODEC_ID_VP6A, FLV_CODECID_VP6A },
48 { AV_CODEC_ID_H264, FLV_CODECID_H264 },
49 { AV_CODEC_ID_NONE, 0 }
52 static const AVCodecTag flv_audio_codec_ids[] = {
53 { AV_CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET },
54 { AV_CODEC_ID_PCM_U8, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET },
55 { AV_CODEC_ID_PCM_S16BE, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET },
56 { AV_CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET },
57 { AV_CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM >> FLV_AUDIO_CODECID_OFFSET },
58 { AV_CODEC_ID_AAC, FLV_CODECID_AAC >> FLV_AUDIO_CODECID_OFFSET },
59 { AV_CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET },
60 { AV_CODEC_ID_PCM_MULAW, FLV_CODECID_PCM_MULAW >> FLV_AUDIO_CODECID_OFFSET },
61 { AV_CODEC_ID_PCM_ALAW, FLV_CODECID_PCM_ALAW >> FLV_AUDIO_CODECID_OFFSET },
62 { AV_CODEC_ID_SPEEX, FLV_CODECID_SPEEX >> FLV_AUDIO_CODECID_OFFSET },
63 { AV_CODEC_ID_NONE, 0 }
67 FLV_AAC_SEQ_HEADER_DETECT = (1 << 0),
68 FLV_NO_SEQUENCE_END = (1 << 1),
69 FLV_ADD_KEYFRAME_INDEX = (1 << 2),
72 typedef struct FLVFileposition {
73 int64_t keyframe_position;
74 double keyframe_timestamp;
75 struct FLVFileposition *next;
78 typedef struct FLVContext {
81 int64_t duration_offset;
82 int64_t filesize_offset;
84 int64_t delay; ///< first dts delay (needed for AVC & Speex)
86 int64_t datastart_offset;
87 int64_t datasize_offset;
89 int64_t videosize_offset;
91 int64_t audiosize_offset;
94 int64_t metadata_size_pos;
95 int64_t metadata_totalsize_pos;
96 int64_t metadata_totalsize;
97 int64_t keyframe_index_size;
99 int64_t lasttimestamp_offset;
100 double lasttimestamp;
101 int64_t lastkeyframetimestamp_offset;
102 double lastkeyframetimestamp;
103 int64_t lastkeyframelocation_offset;
104 int64_t lastkeyframelocation;
107 int64_t keyframes_info_offset;
109 int64_t filepositions_count;
110 FLVFileposition *filepositions;
111 FLVFileposition *head_filepositions;
113 AVCodecParameters *audio_par;
114 AVCodecParameters *video_par;
116 AVCodecParameters *data_par;
121 typedef struct FLVStreamContext {
122 int64_t last_ts; ///< last timestamp for each stream
125 static int get_audio_flags(AVFormatContext *s, AVCodecParameters *par)
127 int flags = (par->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT
128 : FLV_SAMPLESSIZE_8BIT;
130 if (par->codec_id == AV_CODEC_ID_AAC) // specs force these parameters
131 return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ |
132 FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
133 else if (par->codec_id == AV_CODEC_ID_SPEEX) {
134 if (par->sample_rate != 16000) {
135 av_log(s, AV_LOG_ERROR,
136 "FLV only supports wideband (16kHz) Speex audio\n");
137 return AVERROR(EINVAL);
139 if (par->channels != 1) {
140 av_log(s, AV_LOG_ERROR, "FLV only supports mono Speex audio\n");
141 return AVERROR(EINVAL);
143 return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;
145 switch (par->sample_rate) {
147 // 48khz mp3 is stored with 44k1 samplerate identifer
148 if (par->codec_id == AV_CODEC_ID_MP3) {
149 flags |= FLV_SAMPLERATE_44100HZ;
155 flags |= FLV_SAMPLERATE_44100HZ;
158 flags |= FLV_SAMPLERATE_22050HZ;
161 flags |= FLV_SAMPLERATE_11025HZ;
163 case 16000: // nellymoser only
164 case 8000: // nellymoser only
165 case 5512: // not MP3
166 if (par->codec_id != AV_CODEC_ID_MP3) {
167 flags |= FLV_SAMPLERATE_SPECIAL;
172 av_log(s, AV_LOG_ERROR,
173 "FLV does not support sample rate %d, "
174 "choose from (44100, 22050, 11025)\n", par->sample_rate);
175 return AVERROR(EINVAL);
179 if (par->channels > 1)
182 switch (par->codec_id) {
183 case AV_CODEC_ID_MP3:
184 flags |= FLV_CODECID_MP3 | FLV_SAMPLESSIZE_16BIT;
186 case AV_CODEC_ID_PCM_U8:
187 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_8BIT;
189 case AV_CODEC_ID_PCM_S16BE:
190 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_16BIT;
192 case AV_CODEC_ID_PCM_S16LE:
193 flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
195 case AV_CODEC_ID_ADPCM_SWF:
196 flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT;
198 case AV_CODEC_ID_NELLYMOSER:
199 if (par->sample_rate == 8000)
200 flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
201 else if (par->sample_rate == 16000)
202 flags |= FLV_CODECID_NELLYMOSER_16KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
204 flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;
206 case AV_CODEC_ID_PCM_MULAW:
207 flags = FLV_CODECID_PCM_MULAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
209 case AV_CODEC_ID_PCM_ALAW:
210 flags = FLV_CODECID_PCM_ALAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
213 flags |= par->codec_tag << 4;
216 av_log(s, AV_LOG_ERROR, "Audio codec '%s' not compatible with FLV\n",
217 avcodec_get_name(par->codec_id));
218 return AVERROR(EINVAL);
224 static void put_amf_string(AVIOContext *pb, const char *str)
226 size_t len = strlen(str);
228 avio_write(pb, str, len);
231 static void put_avc_eos_tag(AVIOContext *pb, unsigned ts)
233 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
234 avio_wb24(pb, 5); /* Tag Data Size */
235 avio_wb24(pb, ts); /* lower 24 bits of timestamp in ms */
236 avio_w8(pb, (ts >> 24) & 0x7F); /* MSB of ts in ms */
237 avio_wb24(pb, 0); /* StreamId = 0 */
238 avio_w8(pb, 23); /* ub[4] FrameType = 1, ub[4] CodecId = 7 */
239 avio_w8(pb, 2); /* AVC end of sequence */
240 avio_wb24(pb, 0); /* Always 0 for AVC EOS. */
241 avio_wb32(pb, 16); /* Size of FLV tag */
244 static void put_amf_double(AVIOContext *pb, double d)
246 avio_w8(pb, AMF_DATA_TYPE_NUMBER);
247 avio_wb64(pb, av_double2int(d));
250 static void put_amf_byte(AVIOContext *pb, unsigned char abyte)
255 static void put_amf_dword_array(AVIOContext *pb, uint32_t dw)
257 avio_w8(pb, AMF_DATA_TYPE_ARRAY);
261 static void put_amf_bool(AVIOContext *pb, int b)
263 avio_w8(pb, AMF_DATA_TYPE_BOOL);
267 static void write_metadata(AVFormatContext *s, unsigned int ts)
269 AVIOContext *pb = s->pb;
270 FLVContext *flv = s->priv_data;
271 int metadata_count = 0;
272 int64_t metadata_count_pos;
273 AVDictionaryEntry *tag = NULL;
276 avio_w8(pb, FLV_TAG_TYPE_META); // tag type META
277 flv->metadata_size_pos = avio_tell(pb);
278 avio_wb24(pb, 0); // size of data part (sum of all parts below)
279 avio_wb24(pb, ts); // timestamp
280 avio_wb32(pb, 0); // reserved
282 /* now data of data_size size */
284 /* first event name as a string */
285 avio_w8(pb, AMF_DATA_TYPE_STRING);
286 put_amf_string(pb, "onMetaData"); // 12 bytes
288 /* mixed array (hash) with size and string/type/data tuples */
289 avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
290 metadata_count_pos = avio_tell(pb);
291 metadata_count = 4 * !!flv->video_par +
292 5 * !!flv->audio_par +
295 metadata_count += 2; // +2 for duration and file size
297 avio_wb32(pb, metadata_count);
300 put_amf_string(pb, "duration");
301 flv->duration_offset = avio_tell(pb);
302 // fill in the guessed duration, it'll be corrected later if incorrect
303 put_amf_double(pb, s->duration / AV_TIME_BASE);
306 if (flv->video_par) {
307 put_amf_string(pb, "width");
308 put_amf_double(pb, flv->video_par->width);
310 put_amf_string(pb, "height");
311 put_amf_double(pb, flv->video_par->height);
313 put_amf_string(pb, "videodatarate");
314 put_amf_double(pb, flv->video_par->bit_rate / 1024.0);
316 if (flv->framerate != 0.0) {
317 put_amf_string(pb, "framerate");
318 put_amf_double(pb, flv->framerate);
322 put_amf_string(pb, "videocodecid");
323 put_amf_double(pb, flv->video_par->codec_tag);
326 if (flv->audio_par) {
327 put_amf_string(pb, "audiodatarate");
328 put_amf_double(pb, flv->audio_par->bit_rate / 1024.0);
330 put_amf_string(pb, "audiosamplerate");
331 put_amf_double(pb, flv->audio_par->sample_rate);
333 put_amf_string(pb, "audiosamplesize");
334 put_amf_double(pb, flv->audio_par->codec_id == AV_CODEC_ID_PCM_U8 ? 8 : 16);
336 put_amf_string(pb, "stereo");
337 put_amf_bool(pb, flv->audio_par->channels == 2);
339 put_amf_string(pb, "audiocodecid");
340 put_amf_double(pb, flv->audio_par->codec_tag);
344 put_amf_string(pb, "datastream");
345 put_amf_double(pb, 0.0);
348 ff_standardize_creation_time(s);
349 while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
350 if( !strcmp(tag->key, "width")
351 ||!strcmp(tag->key, "height")
352 ||!strcmp(tag->key, "videodatarate")
353 ||!strcmp(tag->key, "framerate")
354 ||!strcmp(tag->key, "videocodecid")
355 ||!strcmp(tag->key, "audiodatarate")
356 ||!strcmp(tag->key, "audiosamplerate")
357 ||!strcmp(tag->key, "audiosamplesize")
358 ||!strcmp(tag->key, "stereo")
359 ||!strcmp(tag->key, "audiocodecid")
360 ||!strcmp(tag->key, "duration")
361 ||!strcmp(tag->key, "onMetaData")
362 ||!strcmp(tag->key, "datasize")
363 ||!strcmp(tag->key, "lasttimestamp")
364 ||!strcmp(tag->key, "totalframes")
365 ||!strcmp(tag->key, "hasAudio")
366 ||!strcmp(tag->key, "hasVideo")
367 ||!strcmp(tag->key, "hasCuePoints")
368 ||!strcmp(tag->key, "hasMetadata")
369 ||!strcmp(tag->key, "hasKeyframes")
371 av_log(s, AV_LOG_DEBUG, "Ignoring metadata for %s\n", tag->key);
374 put_amf_string(pb, tag->key);
375 avio_w8(pb, AMF_DATA_TYPE_STRING);
376 put_amf_string(pb, tag->value);
381 put_amf_string(pb, "filesize");
382 flv->filesize_offset = avio_tell(pb);
383 put_amf_double(pb, 0); // delayed write
386 if (flv->flags & FLV_ADD_KEYFRAME_INDEX) {
387 flv->acurframeindex = 0;
388 flv->keyframe_index_size = 0;
390 put_amf_string(pb, "hasVideo");
391 put_amf_bool(pb, !!flv->video_par);
394 put_amf_string(pb, "hasKeyframes");
398 put_amf_string(pb, "hasAudio");
399 put_amf_bool(pb, !!flv->audio_par);
402 put_amf_string(pb, "hasMetadata");
406 put_amf_string(pb, "canSeekToEnd");
410 put_amf_string(pb, "datasize");
411 flv->datasize_offset = avio_tell(pb);
413 put_amf_double(pb, flv->datasize);
416 put_amf_string(pb, "videosize");
417 flv->videosize_offset = avio_tell(pb);
419 put_amf_double(pb, flv->videosize);
422 put_amf_string(pb, "audiosize");
423 flv->audiosize_offset = avio_tell(pb);
425 put_amf_double(pb, flv->audiosize);
428 put_amf_string(pb, "lasttimestamp");
429 flv->lasttimestamp_offset = avio_tell(pb);
430 flv->lasttimestamp = 0;
431 put_amf_double(pb, 0);
434 put_amf_string(pb, "lastkeyframetimestamp");
435 flv->lastkeyframetimestamp_offset = avio_tell(pb);
436 flv->lastkeyframetimestamp = 0;
437 put_amf_double(pb, 0);
440 put_amf_string(pb, "lastkeyframelocation");
441 flv->lastkeyframelocation_offset = avio_tell(pb);
442 flv->lastkeyframelocation = 0;
443 put_amf_double(pb, 0);
446 put_amf_string(pb, "keyframes");
447 put_amf_byte(pb, AMF_DATA_TYPE_OBJECT);
450 flv->keyframes_info_offset = avio_tell(pb);
453 put_amf_string(pb, "");
454 avio_w8(pb, AMF_END_OF_OBJECT);
456 /* write total size of tag */
457 flv->metadata_totalsize = avio_tell(pb) - flv->metadata_size_pos - 10;
459 avio_seek(pb, metadata_count_pos, SEEK_SET);
460 avio_wb32(pb, metadata_count);
462 avio_seek(pb, flv->metadata_size_pos, SEEK_SET);
463 avio_wb24(pb, flv->metadata_totalsize);
464 avio_skip(pb, flv->metadata_totalsize + 10 - 3);
465 flv->metadata_totalsize_pos = avio_tell(pb);
466 avio_wb32(pb, flv->metadata_totalsize + 11);
469 static int unsupported_codec(AVFormatContext *s,
470 const char* type, int codec_id)
472 const AVCodecDescriptor *desc = avcodec_descriptor_get(codec_id);
473 av_log(s, AV_LOG_ERROR,
474 "%s codec %s not compatible with flv\n",
476 desc ? desc->name : "unknown");
477 return AVERROR(ENOSYS);
480 static void flv_write_codec_header(AVFormatContext* s, AVCodecParameters* par) {
482 AVIOContext *pb = s->pb;
483 FLVContext *flv = s->priv_data;
485 if (par->codec_id == AV_CODEC_ID_AAC || par->codec_id == AV_CODEC_ID_H264
486 || par->codec_id == AV_CODEC_ID_MPEG4) {
489 par->codec_type == AVMEDIA_TYPE_VIDEO ?
490 FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
491 avio_wb24(pb, 0); // size patched later
492 avio_wb24(pb, 0); // ts
493 avio_w8(pb, 0); // ts ext
494 avio_wb24(pb, 0); // streamid
496 if (par->codec_id == AV_CODEC_ID_AAC) {
497 avio_w8(pb, get_audio_flags(s, par));
498 avio_w8(pb, 0); // AAC sequence header
500 if (!par->extradata_size && (flv->flags & FLV_AAC_SEQ_HEADER_DETECT)) {
502 int samplerate_index;
503 int channels = flv->audio_par->channels
504 - (flv->audio_par->channels == 8 ? 1 : 0);
507 for (samplerate_index = 0; samplerate_index < 16;
509 if (flv->audio_par->sample_rate
510 == mpeg4audio_sample_rates[samplerate_index])
513 init_put_bits(&pbc, data, sizeof(data));
514 put_bits(&pbc, 5, flv->audio_par->profile + 1); //profile
515 put_bits(&pbc, 4, samplerate_index); //sample rate index
516 put_bits(&pbc, 4, channels);
517 put_bits(&pbc, 1, 0); //frame length - 1024 samples
518 put_bits(&pbc, 1, 0); //does not depend on core coder
519 put_bits(&pbc, 1, 0); //is not extension
520 flush_put_bits(&pbc);
522 avio_w8(pb, data[0]);
523 avio_w8(pb, data[1]);
525 av_log(s, AV_LOG_WARNING, "AAC sequence header: %02x %02x.\n",
528 avio_write(pb, par->extradata, par->extradata_size);
530 avio_w8(pb, par->codec_tag | FLV_FRAME_KEY); // flags
531 avio_w8(pb, 0); // AVC sequence header
532 avio_wb24(pb, 0); // composition time
533 ff_isom_write_avcc(pb, par->extradata, par->extradata_size);
535 data_size = avio_tell(pb) - pos;
536 avio_seek(pb, -data_size - 10, SEEK_CUR);
537 avio_wb24(pb, data_size);
538 avio_skip(pb, data_size + 10 - 3);
539 avio_wb32(pb, data_size + 11); // previous tag size
543 static int flv_append_keyframe_info(AVFormatContext *s, FLVContext *flv, double ts, int64_t pos)
545 FLVFileposition *position = av_malloc(sizeof(FLVFileposition));
548 av_log(s, AV_LOG_WARNING, "no mem for add keyframe index!\n");
549 return AVERROR(ENOMEM);
552 position->keyframe_timestamp = ts;
553 position->keyframe_position = pos;
555 if (!flv->filepositions_count) {
556 flv->filepositions = position;
557 flv->head_filepositions = flv->filepositions;
558 position->next = NULL;
560 flv->filepositions->next = position;
561 position->next = NULL;
562 flv->filepositions = flv->filepositions->next;
565 flv->filepositions_count++;
570 static int shift_data(AVFormatContext *s)
574 int64_t metadata_size = 0;
575 FLVContext *flv = s->priv_data;
576 int64_t pos, pos_end = avio_tell(s->pb);
577 uint8_t *buf, *read_buf[2];
580 AVIOContext *read_pb;
582 metadata_size = flv->filepositions_count * 9 * 2 + 10; /* filepositions and times value */
583 metadata_size += 2 + 13; /* filepositions String */
584 metadata_size += 2 + 5; /* times String */
585 metadata_size += 3; /* Object end */
587 flv->keyframe_index_size = metadata_size;
589 if (metadata_size < 0)
590 return metadata_size;
592 buf = av_malloc_array(metadata_size, 2);
594 return AVERROR(ENOMEM);
597 read_buf[1] = buf + metadata_size;
599 avio_seek(s->pb, flv->metadata_size_pos, SEEK_SET);
600 avio_wb24(s->pb, flv->metadata_totalsize + metadata_size);
602 avio_seek(s->pb, flv->metadata_totalsize_pos, SEEK_SET);
603 avio_wb32(s->pb, flv->metadata_totalsize + 11 + metadata_size);
604 avio_seek(s->pb, pos_end, SEEK_SET);
606 /* Shift the data: the AVIO context of the output can only be used for
607 * writing, so we re-open the same output, but for reading. It also avoids
608 * a read/seek/write/seek back and forth. */
610 ret = s->io_open(s, &read_pb, s->filename, AVIO_FLAG_READ, NULL);
612 av_log(s, AV_LOG_ERROR, "Unable to re-open %s output file for "
613 "the second pass (add_keyframe_index)\n", s->filename);
617 /* mark the end of the shift to up to the last data we wrote, and get ready
619 pos_end = avio_tell(s->pb);
620 avio_seek(s->pb, flv->keyframes_info_offset + metadata_size, SEEK_SET);
622 /* start reading at where the keyframe index information will be placed */
623 avio_seek(read_pb, flv->keyframes_info_offset, SEEK_SET);
624 pos = avio_tell(read_pb);
626 /* shift data by chunk of at most keyframe *filepositions* and *times* size */
627 read_size[read_buf_id] = avio_read(read_pb, read_buf[read_buf_id], metadata_size); \
631 read_size[read_buf_id] = avio_read(read_pb, read_buf[read_buf_id], metadata_size); \
633 n = read_size[read_buf_id];
636 avio_write(s->pb, read_buf[read_buf_id], n);
638 } while (pos <= pos_end);
640 ff_format_io_close(s, &read_pb);
648 static int flv_write_header(AVFormatContext *s)
651 AVIOContext *pb = s->pb;
652 FLVContext *flv = s->priv_data;
654 for (i = 0; i < s->nb_streams; i++) {
655 AVCodecParameters *par = s->streams[i]->codecpar;
656 FLVStreamContext *sc;
657 switch (par->codec_type) {
658 case AVMEDIA_TYPE_VIDEO:
659 if (s->streams[i]->avg_frame_rate.den &&
660 s->streams[i]->avg_frame_rate.num) {
661 flv->framerate = av_q2d(s->streams[i]->avg_frame_rate);
663 if (flv->video_par) {
664 av_log(s, AV_LOG_ERROR,
665 "at most one video stream is supported in flv\n");
666 return AVERROR(EINVAL);
668 flv->video_par = par;
669 if (!ff_codec_get_tag(flv_video_codec_ids, par->codec_id))
670 return unsupported_codec(s, "Video", par->codec_id);
672 if (par->codec_id == AV_CODEC_ID_MPEG4 ||
673 par->codec_id == AV_CODEC_ID_H263) {
674 int error = s->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL;
675 av_log(s, error ? AV_LOG_ERROR : AV_LOG_WARNING,
676 "Codec %s is not supported in the official FLV specification,\n", avcodec_get_name(par->codec_id));
679 av_log(s, AV_LOG_ERROR,
680 "use vstrict=-1 / -strict -1 to use it anyway.\n");
681 return AVERROR(EINVAL);
683 } else if (par->codec_id == AV_CODEC_ID_VP6) {
684 av_log(s, AV_LOG_WARNING,
685 "Muxing VP6 in flv will produce flipped video on playback.\n");
688 case AVMEDIA_TYPE_AUDIO:
689 if (flv->audio_par) {
690 av_log(s, AV_LOG_ERROR,
691 "at most one audio stream is supported in flv\n");
692 return AVERROR(EINVAL);
694 flv->audio_par = par;
695 if (get_audio_flags(s, par) < 0)
696 return unsupported_codec(s, "Audio", par->codec_id);
697 if (par->codec_id == AV_CODEC_ID_PCM_S16BE)
698 av_log(s, AV_LOG_WARNING,
699 "16-bit big-endian audio in flv is valid but most likely unplayable (hardware dependent); use s16le\n");
701 case AVMEDIA_TYPE_DATA:
702 if (par->codec_id != AV_CODEC_ID_TEXT && par->codec_id != AV_CODEC_ID_NONE)
703 return unsupported_codec(s, "Data", par->codec_id);
706 case AVMEDIA_TYPE_SUBTITLE:
707 if (par->codec_id != AV_CODEC_ID_TEXT) {
708 av_log(s, AV_LOG_ERROR, "Subtitle codec '%s' for stream %d is not compatible with FLV\n",
709 avcodec_get_name(par->codec_id), i);
710 return AVERROR_INVALIDDATA;
715 av_log(s, AV_LOG_ERROR, "Codec type '%s' for stream %d is not compatible with FLV\n",
716 av_get_media_type_string(par->codec_type), i);
717 return AVERROR(EINVAL);
719 avpriv_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
721 sc = av_mallocz(sizeof(FLVStreamContext));
723 return AVERROR(ENOMEM);
724 s->streams[i]->priv_data = sc;
728 flv->delay = AV_NOPTS_VALUE;
730 avio_write(pb, "FLV", 3);
732 avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!flv->audio_par +
733 FLV_HEADER_FLAG_HASVIDEO * !!flv->video_par);
737 for (i = 0; i < s->nb_streams; i++)
738 if (s->streams[i]->codecpar->codec_tag == 5) {
739 avio_w8(pb, 8); // message type
740 avio_wb24(pb, 0); // include flags
741 avio_wb24(pb, 0); // time stamp
742 avio_wb32(pb, 0); // reserved
743 avio_wb32(pb, 11); // size
747 write_metadata(s, 0);
749 for (i = 0; i < s->nb_streams; i++) {
750 flv_write_codec_header(s, s->streams[i]->codecpar);
753 flv->datastart_offset = avio_tell(pb);
757 static int flv_write_trailer(AVFormatContext *s)
760 AVIOContext *pb = s->pb;
761 FLVContext *flv = s->priv_data;
762 int build_keyframes_idx = flv->flags & FLV_ADD_KEYFRAME_INDEX;
764 int64_t cur_pos = avio_tell(s->pb);
766 if (build_keyframes_idx) {
767 FLVFileposition *newflv_posinfo, *p;
769 avio_seek(pb, flv->videosize_offset, SEEK_SET);
770 put_amf_double(pb, flv->videosize);
772 avio_seek(pb, flv->audiosize_offset, SEEK_SET);
773 put_amf_double(pb, flv->audiosize);
775 avio_seek(pb, flv->lasttimestamp_offset, SEEK_SET);
776 put_amf_double(pb, flv->lasttimestamp);
778 avio_seek(pb, flv->lastkeyframetimestamp_offset, SEEK_SET);
779 put_amf_double(pb, flv->lastkeyframetimestamp);
781 avio_seek(pb, flv->lastkeyframelocation_offset, SEEK_SET);
782 put_amf_double(pb, flv->lastkeyframelocation + flv->keyframe_index_size);
783 avio_seek(pb, cur_pos, SEEK_SET);
789 avio_seek(pb, flv->keyframes_info_offset, SEEK_SET);
790 put_amf_string(pb, "filepositions");
791 put_amf_dword_array(pb, flv->filepositions_count);
792 for (newflv_posinfo = flv->head_filepositions; newflv_posinfo; newflv_posinfo = newflv_posinfo->next) {
793 put_amf_double(pb, newflv_posinfo->keyframe_position + flv->keyframe_index_size);
796 put_amf_string(pb, "times");
797 put_amf_dword_array(pb, flv->filepositions_count);
798 for (newflv_posinfo = flv->head_filepositions; newflv_posinfo; newflv_posinfo = newflv_posinfo->next) {
799 put_amf_double(pb, newflv_posinfo->keyframe_timestamp);
802 newflv_posinfo = flv->head_filepositions;
803 while (newflv_posinfo) {
804 p = newflv_posinfo->next;
806 newflv_posinfo->next = p->next;
810 av_free(newflv_posinfo);
811 newflv_posinfo = NULL;
815 put_amf_string(pb, "");
816 avio_w8(pb, AMF_END_OF_OBJECT);
818 avio_seek(pb, cur_pos + flv->keyframe_index_size, SEEK_SET);
822 if (flv->flags & FLV_NO_SEQUENCE_END) {
823 av_log(s, AV_LOG_DEBUG, "FLV no sequence end mode open\n");
826 for (i = 0; i < s->nb_streams; i++) {
827 AVCodecParameters *par = s->streams[i]->codecpar;
828 FLVStreamContext *sc = s->streams[i]->priv_data;
829 if (par->codec_type == AVMEDIA_TYPE_VIDEO &&
830 (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4))
831 put_avc_eos_tag(pb, sc->last_ts);
835 file_size = avio_tell(pb);
837 if (build_keyframes_idx) {
838 flv->datasize = file_size - flv->datastart_offset;
839 avio_seek(pb, flv->datasize_offset, SEEK_SET);
840 put_amf_double(pb, flv->datasize);
843 /* update information */
844 if (avio_seek(pb, flv->duration_offset, SEEK_SET) < 0) {
845 av_log(s, AV_LOG_WARNING, "Failed to update header with correct duration.\n");
847 put_amf_double(pb, flv->duration / (double)1000);
849 if (avio_seek(pb, flv->filesize_offset, SEEK_SET) < 0) {
850 av_log(s, AV_LOG_WARNING, "Failed to update header with correct filesize.\n");
852 put_amf_double(pb, file_size);
855 avio_seek(pb, file_size, SEEK_SET);
859 static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
861 AVIOContext *pb = s->pb;
862 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
863 FLVContext *flv = s->priv_data;
864 FLVStreamContext *sc = s->streams[pkt->stream_index]->priv_data;
866 int size = pkt->size;
867 uint8_t *data = NULL;
868 int flags = -1, flags_size, ret;
869 int64_t cur_offset = avio_tell(pb);
871 if (par->codec_id == AV_CODEC_ID_VP6F || par->codec_id == AV_CODEC_ID_VP6A ||
872 par->codec_id == AV_CODEC_ID_VP6 || par->codec_id == AV_CODEC_ID_AAC)
874 else if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4)
879 if (par->codec_id == AV_CODEC_ID_AAC || par->codec_id == AV_CODEC_ID_H264
880 || par->codec_id == AV_CODEC_ID_MPEG4) {
882 uint8_t *side = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, &side_size);
883 if (side && side_size > 0 && (side_size != par->extradata_size || memcmp(side, par->extradata, side_size))) {
884 av_free(par->extradata);
885 par->extradata = av_mallocz(side_size + AV_INPUT_BUFFER_PADDING_SIZE);
886 memcpy(par->extradata, side, side_size);
887 par->extradata_size = side_size;
888 flv_write_codec_header(s, par);
892 if (flv->delay == AV_NOPTS_VALUE)
893 flv->delay = -pkt->dts;
895 if (pkt->dts < -flv->delay) {
896 av_log(s, AV_LOG_WARNING,
897 "Packets are not in the proper order with respect to DTS\n");
898 return AVERROR(EINVAL);
903 if (s->event_flags & AVSTREAM_EVENT_FLAG_METADATA_UPDATED) {
904 write_metadata(s, ts);
905 s->event_flags &= ~AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
908 avio_write_marker(pb, av_rescale(ts, AV_TIME_BASE, 1000),
909 pkt->flags & AV_PKT_FLAG_KEY && (flv->video_par ? par->codec_type == AVMEDIA_TYPE_VIDEO : 1) ? AVIO_DATA_MARKER_SYNC_POINT : AVIO_DATA_MARKER_BOUNDARY_POINT);
911 switch (par->codec_type) {
912 case AVMEDIA_TYPE_VIDEO:
913 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
915 flags = ff_codec_get_tag(flv_video_codec_ids, par->codec_id);
917 flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
919 case AVMEDIA_TYPE_AUDIO:
920 flags = get_audio_flags(s, par);
924 avio_w8(pb, FLV_TAG_TYPE_AUDIO);
926 case AVMEDIA_TYPE_SUBTITLE:
927 case AVMEDIA_TYPE_DATA:
928 avio_w8(pb, FLV_TAG_TYPE_META);
931 return AVERROR(EINVAL);
934 if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4) {
935 /* check if extradata looks like mp4 formatted */
936 if (par->extradata_size > 0 && *(uint8_t*)par->extradata != 1)
937 if ((ret = ff_avc_parse_nal_units_buf(pkt->data, &data, &size)) < 0)
939 } else if (par->codec_id == AV_CODEC_ID_AAC && pkt->size > 2 &&
940 (AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
941 if (!s->streams[pkt->stream_index]->nb_frames) {
942 av_log(s, AV_LOG_ERROR, "Malformed AAC bitstream detected: "
943 "use the audio bitstream filter 'aac_adtstoasc' to fix it "
944 "('-bsf:a aac_adtstoasc' option with ffmpeg)\n");
945 return AVERROR_INVALIDDATA;
947 av_log(s, AV_LOG_WARNING, "aac bitstream error\n");
950 /* check Speex packet duration */
951 if (par->codec_id == AV_CODEC_ID_SPEEX && ts - sc->last_ts > 160)
952 av_log(s, AV_LOG_WARNING, "Warning: Speex stream has more than "
953 "8 frames per packet. Adobe Flash "
954 "Player cannot handle this!\n");
956 if (sc->last_ts < ts)
959 if (size + flags_size >= 1<<24) {
960 av_log(s, AV_LOG_ERROR, "Too large packet with size %u >= %u\n",
961 size + flags_size, 1<<24);
962 return AVERROR(EINVAL);
965 avio_wb24(pb, size + flags_size);
966 avio_wb24(pb, ts & 0xFFFFFF);
967 avio_w8(pb, (ts >> 24) & 0x7F); // timestamps are 32 bits _signed_
968 avio_wb24(pb, flv->reserved);
970 if (par->codec_type == AVMEDIA_TYPE_DATA ||
971 par->codec_type == AVMEDIA_TYPE_SUBTITLE ) {
973 int64_t metadata_size_pos = avio_tell(pb);
974 if (par->codec_id == AV_CODEC_ID_TEXT) {
975 // legacy FFmpeg magic?
976 avio_w8(pb, AMF_DATA_TYPE_STRING);
977 put_amf_string(pb, "onTextData");
978 avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
980 put_amf_string(pb, "type");
981 avio_w8(pb, AMF_DATA_TYPE_STRING);
982 put_amf_string(pb, "Text");
983 put_amf_string(pb, "text");
984 avio_w8(pb, AMF_DATA_TYPE_STRING);
985 put_amf_string(pb, pkt->data);
986 put_amf_string(pb, "");
987 avio_w8(pb, AMF_END_OF_OBJECT);
989 // just pass the metadata through
990 avio_write(pb, data ? data : pkt->data, size);
992 /* write total size of tag */
993 data_size = avio_tell(pb) - metadata_size_pos;
994 avio_seek(pb, metadata_size_pos - 10, SEEK_SET);
995 avio_wb24(pb, data_size);
996 avio_seek(pb, data_size + 10 - 3, SEEK_CUR);
997 avio_wb32(pb, data_size + 11);
999 av_assert1(flags>=0);
1001 if (par->codec_id == AV_CODEC_ID_VP6)
1003 if (par->codec_id == AV_CODEC_ID_VP6F || par->codec_id == AV_CODEC_ID_VP6A) {
1004 if (par->extradata_size)
1005 avio_w8(pb, par->extradata[0]);
1007 avio_w8(pb, ((FFALIGN(par->width, 16) - par->width) << 4) |
1008 (FFALIGN(par->height, 16) - par->height));
1009 } else if (par->codec_id == AV_CODEC_ID_AAC)
1010 avio_w8(pb, 1); // AAC raw
1011 else if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4) {
1012 avio_w8(pb, 1); // AVC NALU
1013 avio_wb24(pb, pkt->pts - pkt->dts);
1016 avio_write(pb, data ? data : pkt->data, size);
1018 avio_wb32(pb, size + flags_size + 11); // previous tag size
1019 flv->duration = FFMAX(flv->duration,
1020 pkt->pts + flv->delay + pkt->duration);
1023 if (flv->flags & FLV_ADD_KEYFRAME_INDEX) {
1024 switch (par->codec_type) {
1025 case AVMEDIA_TYPE_VIDEO:
1026 flv->videosize += (avio_tell(pb) - cur_offset);
1027 flv->lasttimestamp = flv->acurframeindex / flv->framerate;
1028 if (pkt->flags & AV_PKT_FLAG_KEY) {
1029 double ts = flv->acurframeindex / flv->framerate;
1030 int64_t pos = cur_offset;
1032 flv->lastkeyframetimestamp = flv->acurframeindex / flv->framerate;
1033 flv->lastkeyframelocation = pos;
1034 flv_append_keyframe_info(s, flv, ts, pos);
1036 flv->acurframeindex++;
1039 case AVMEDIA_TYPE_AUDIO:
1040 flv->audiosize += (avio_tell(pb) - cur_offset);
1044 av_log(s, AV_LOG_WARNING, "par->codec_type is type = [%d]\n", par->codec_type);
1054 static const AVOption options[] = {
1055 { "flvflags", "FLV muxer flags", offsetof(FLVContext, flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
1056 { "aac_seq_header_detect", "Put AAC sequence header based on stream data", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_AAC_SEQ_HEADER_DETECT}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
1057 { "no_sequence_end", "disable sequence end for FLV", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_NO_SEQUENCE_END}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
1058 { "add_keyframe_index", "Add keyframe index metadata", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_ADD_KEYFRAME_INDEX}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
1062 static const AVClass flv_muxer_class = {
1063 .class_name = "flv muxer",
1064 .item_name = av_default_item_name,
1066 .version = LIBAVUTIL_VERSION_INT,
1069 AVOutputFormat ff_flv_muxer = {
1071 .long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
1072 .mime_type = "video/x-flv",
1073 .extensions = "flv",
1074 .priv_data_size = sizeof(FLVContext),
1075 .audio_codec = CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_ADPCM_SWF,
1076 .video_codec = AV_CODEC_ID_FLV1,
1077 .write_header = flv_write_header,
1078 .write_packet = flv_write_packet,
1079 .write_trailer = flv_write_trailer,
1080 .codec_tag = (const AVCodecTag* const []) {
1081 flv_video_codec_ids, flv_audio_codec_ids, 0
1083 .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
1085 .priv_class = &flv_muxer_class,