Libav
flvenc.c
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1 /*
2  * FLV muxer
3  * Copyright (c) 2003 The Libav Project
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/dict.h"
23 #include "libavutil/intfloat.h"
24 #include "avc.h"
25 #include "avformat.h"
26 #include "flv.h"
27 #include "internal.h"
28 #include "metadata.h"
29 
30 #undef NDEBUG
31 #include <assert.h>
32 
33 static const AVCodecTag flv_video_codec_ids[] = {
40  { AV_CODEC_ID_NONE, 0 }
41 };
42 
43 static const AVCodecTag flv_audio_codec_ids[] = {
54  { AV_CODEC_ID_NONE, 0 }
55 };
56 
57 typedef struct FLVContext {
58  int reserved;
59  int64_t duration_offset;
60  int64_t filesize_offset;
61  int64_t duration;
62  int64_t delay;
63 } FLVContext;
64 
65 typedef struct FLVStreamContext {
66  int64_t last_ts;
68 
70 {
73 
74  if (enc->codec_id == AV_CODEC_ID_AAC) // specs force these parameters
77  else if (enc->codec_id == AV_CODEC_ID_SPEEX) {
78  if (enc->sample_rate != 16000) {
80  "flv only supports wideband (16kHz) Speex audio\n");
81  return -1;
82  }
83  if (enc->channels != 1) {
84  av_log(s, AV_LOG_ERROR, "flv only supports mono Speex audio\n");
85  return -1;
86  }
88  } else {
89  switch (enc->sample_rate) {
90  case 44100:
91  flags |= FLV_SAMPLERATE_44100HZ;
92  break;
93  case 22050:
94  flags |= FLV_SAMPLERATE_22050HZ;
95  break;
96  case 11025:
97  flags |= FLV_SAMPLERATE_11025HZ;
98  break;
99  case 16000: // nellymoser only
100  case 8000: // nellymoser only
101  case 5512: // not MP3
102  if (enc->codec_id != AV_CODEC_ID_MP3) {
103  flags |= FLV_SAMPLERATE_SPECIAL;
104  break;
105  }
106  default:
107  av_log(s, AV_LOG_ERROR,
108  "flv does not support that sample rate, "
109  "choose from (44100, 22050, 11025).\n");
110  return -1;
111  }
112  }
113 
114  if (enc->channels > 1)
115  flags |= FLV_STEREO;
116 
117  switch (enc->codec_id) {
118  case AV_CODEC_ID_MP3:
120  break;
121  case AV_CODEC_ID_PCM_U8:
123  break;
126  break;
129  break;
132  break;
134  if (enc->sample_rate == 8000)
136  else if (enc->sample_rate == 16000)
138  else
140  break;
143  break;
146  break;
147  case 0:
148  flags |= enc->codec_tag << 4;
149  break;
150  default:
151  av_log(s, AV_LOG_ERROR, "codec not compatible with flv\n");
152  return -1;
153  }
154 
155  return flags;
156 }
157 
158 static void put_amf_string(AVIOContext *pb, const char *str)
159 {
160  size_t len = strlen(str);
161  avio_wb16(pb, len);
162  avio_write(pb, str, len);
163 }
164 
165 static void put_avc_eos_tag(AVIOContext *pb, unsigned ts)
166 {
168  avio_wb24(pb, 5); /* Tag Data Size */
169  avio_wb24(pb, ts); /* lower 24 bits of timestamp in ms */
170  avio_w8(pb, (ts >> 24) & 0x7F); /* MSB of ts in ms */
171  avio_wb24(pb, 0); /* StreamId = 0 */
172  avio_w8(pb, 23); /* ub[4] FrameType = 1, ub[4] CodecId = 7 */
173  avio_w8(pb, 2); /* AVC end of sequence */
174  avio_wb24(pb, 0); /* Always 0 for AVC EOS. */
175  avio_wb32(pb, 16); /* Size of FLV tag */
176 }
177 
178 static void put_amf_double(AVIOContext *pb, double d)
179 {
181  avio_wb64(pb, av_double2int(d));
182 }
183 
184 static void put_amf_bool(AVIOContext *pb, int b)
185 {
187  avio_w8(pb, !!b);
188 }
189 
191 {
192  AVIOContext *pb = s->pb;
193  FLVContext *flv = s->priv_data;
194  AVCodecContext *audio_enc = NULL, *video_enc = NULL, *data_enc = NULL;
195  int i, metadata_count = 0;
196  double framerate = 0.0;
197  int64_t metadata_size_pos, data_size, metadata_count_pos;
199 
200  for (i = 0; i < s->nb_streams; i++) {
201  AVCodecContext *enc = s->streams[i]->codec;
202  FLVStreamContext *sc;
203  switch (enc->codec_type) {
204  case AVMEDIA_TYPE_VIDEO:
205  if (s->streams[i]->avg_frame_rate.den &&
206  s->streams[i]->avg_frame_rate.num) {
207  framerate = av_q2d(s->streams[i]->avg_frame_rate);
208  }
209  if (video_enc) {
210  av_log(s, AV_LOG_ERROR,
211  "at most one video stream is supported in flv\n");
212  return AVERROR(EINVAL);
213  }
214  video_enc = enc;
215  if (enc->codec_tag == 0) {
216  av_log(s, AV_LOG_ERROR, "video codec not compatible with flv\n");
217  return -1;
218  }
219  break;
220  case AVMEDIA_TYPE_AUDIO:
221  if (audio_enc) {
222  av_log(s, AV_LOG_ERROR,
223  "at most one audio stream is supported in flv\n");
224  return AVERROR(EINVAL);
225  }
226  audio_enc = enc;
227  if (get_audio_flags(s, enc) < 0)
228  return AVERROR_INVALIDDATA;
229  break;
230  case AVMEDIA_TYPE_DATA:
231  if (enc->codec_id != AV_CODEC_ID_TEXT) {
232  av_log(s, AV_LOG_ERROR, "codec not compatible with flv\n");
233  return AVERROR_INVALIDDATA;
234  }
235  data_enc = enc;
236  break;
237  default:
238  av_log(s, AV_LOG_ERROR, "codec not compatible with flv\n");
239  return -1;
240  }
241  avpriv_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
242 
243  sc = av_mallocz(sizeof(FLVStreamContext));
244  if (!sc)
245  return AVERROR(ENOMEM);
246  s->streams[i]->priv_data = sc;
247  sc->last_ts = -1;
248  }
249 
250  flv->delay = AV_NOPTS_VALUE;
251 
252  avio_write(pb, "FLV", 3);
253  avio_w8(pb, 1);
254  avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!audio_enc +
255  FLV_HEADER_FLAG_HASVIDEO * !!video_enc);
256  avio_wb32(pb, 9);
257  avio_wb32(pb, 0);
258 
259  for (i = 0; i < s->nb_streams; i++)
260  if (s->streams[i]->codec->codec_tag == 5) {
261  avio_w8(pb, 8); // message type
262  avio_wb24(pb, 0); // include flags
263  avio_wb24(pb, 0); // time stamp
264  avio_wb32(pb, 0); // reserved
265  avio_wb32(pb, 11); // size
266  flv->reserved = 5;
267  }
268 
269  /* write meta_tag */
270  avio_w8(pb, 18); // tag type META
271  metadata_size_pos = avio_tell(pb);
272  avio_wb24(pb, 0); // size of data part (sum of all parts below)
273  avio_wb24(pb, 0); // timestamp
274  avio_wb32(pb, 0); // reserved
275 
276  /* now data of data_size size */
277 
278  /* first event name as a string */
280  put_amf_string(pb, "onMetaData"); // 12 bytes
281 
282  /* mixed array (hash) with size and string/type/data tuples */
284  metadata_count_pos = avio_tell(pb);
285  metadata_count = 4 * !!video_enc +
286  5 * !!audio_enc +
287  1 * !!data_enc +
288  2; // +2 for duration and file size
289 
290  avio_wb32(pb, metadata_count);
291 
292  put_amf_string(pb, "duration");
293  flv->duration_offset= avio_tell(pb);
294 
295  // fill in the guessed duration, it'll be corrected later if incorrect
297 
298  if (video_enc) {
299  put_amf_string(pb, "width");
300  put_amf_double(pb, video_enc->width);
301 
302  put_amf_string(pb, "height");
303  put_amf_double(pb, video_enc->height);
304 
305  put_amf_string(pb, "videodatarate");
306  put_amf_double(pb, video_enc->bit_rate / 1024.0);
307 
308  if (framerate != 0.0) {
309  put_amf_string(pb, "framerate");
310  put_amf_double(pb, framerate);
311  metadata_count++;
312  }
313 
314  put_amf_string(pb, "videocodecid");
315  put_amf_double(pb, video_enc->codec_tag);
316  }
317 
318  if (audio_enc) {
319  put_amf_string(pb, "audiodatarate");
320  put_amf_double(pb, audio_enc->bit_rate / 1024.0);
321 
322  put_amf_string(pb, "audiosamplerate");
323  put_amf_double(pb, audio_enc->sample_rate);
324 
325  put_amf_string(pb, "audiosamplesize");
326  put_amf_double(pb, audio_enc->codec_id == AV_CODEC_ID_PCM_U8 ? 8 : 16);
327 
328  put_amf_string(pb, "stereo");
329  put_amf_bool(pb, audio_enc->channels == 2);
330 
331  put_amf_string(pb, "audiocodecid");
332  put_amf_double(pb, audio_enc->codec_tag);
333  }
334 
335  if (data_enc) {
336  put_amf_string(pb, "datastream");
337  put_amf_double(pb, 0.0);
338  }
339 
340  while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
341  put_amf_string(pb, tag->key);
343  put_amf_string(pb, tag->value);
344  metadata_count++;
345  }
346 
347  put_amf_string(pb, "filesize");
348  flv->filesize_offset = avio_tell(pb);
349  put_amf_double(pb, 0); // delayed write
350 
351  put_amf_string(pb, "");
353 
354  /* write total size of tag */
355  data_size = avio_tell(pb) - metadata_size_pos - 10;
356 
357  avio_seek(pb, metadata_count_pos, SEEK_SET);
358  avio_wb32(pb, metadata_count);
359 
360  avio_seek(pb, metadata_size_pos, SEEK_SET);
361  avio_wb24(pb, data_size);
362  avio_skip(pb, data_size + 10 - 3);
363  avio_wb32(pb, data_size + 11);
364 
365  for (i = 0; i < s->nb_streams; i++) {
366  AVCodecContext *enc = s->streams[i]->codec;
367  if (enc->codec_id == AV_CODEC_ID_AAC || enc->codec_id == AV_CODEC_ID_H264) {
368  int64_t pos;
371  avio_wb24(pb, 0); // size patched later
372  avio_wb24(pb, 0); // ts
373  avio_w8(pb, 0); // ts ext
374  avio_wb24(pb, 0); // streamid
375  pos = avio_tell(pb);
376  if (enc->codec_id == AV_CODEC_ID_AAC) {
377  avio_w8(pb, get_audio_flags(s, enc));
378  avio_w8(pb, 0); // AAC sequence header
379  avio_write(pb, enc->extradata, enc->extradata_size);
380  } else {
381  avio_w8(pb, enc->codec_tag | FLV_FRAME_KEY); // flags
382  avio_w8(pb, 0); // AVC sequence header
383  avio_wb24(pb, 0); // composition time
385  }
386  data_size = avio_tell(pb) - pos;
387  avio_seek(pb, -data_size - 10, SEEK_CUR);
388  avio_wb24(pb, data_size);
389  avio_skip(pb, data_size + 10 - 3);
390  avio_wb32(pb, data_size + 11); // previous tag size
391  }
392  }
393 
394  return 0;
395 }
396 
398 {
399  int64_t file_size;
400 
401  AVIOContext *pb = s->pb;
402  FLVContext *flv = s->priv_data;
403  int i;
404 
405  /* Add EOS tag */
406  for (i = 0; i < s->nb_streams; i++) {
407  AVCodecContext *enc = s->streams[i]->codec;
408  FLVStreamContext *sc = s->streams[i]->priv_data;
409  if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&
410  enc->codec_id == AV_CODEC_ID_H264)
411  put_avc_eos_tag(pb, sc->last_ts);
412  }
413 
414  file_size = avio_tell(pb);
415 
416  /* update information */
417  if (avio_seek(pb, flv->duration_offset, SEEK_SET) < 0)
418  av_log(s, AV_LOG_WARNING, "Failed to update header with correct duration.\n");
419  else
420  put_amf_double(pb, flv->duration / (double)1000);
421  if (avio_seek(pb, flv->filesize_offset, SEEK_SET) < 0)
422  av_log(s, AV_LOG_WARNING, "Failed to update header with correct filesize.\n");
423  else
424  put_amf_double(pb, file_size);
425 
426  avio_seek(pb, file_size, SEEK_SET);
427  return 0;
428 }
429 
431 {
432  AVIOContext *pb = s->pb;
433  AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
434  FLVContext *flv = s->priv_data;
436  unsigned ts;
437  int size = pkt->size;
438  uint8_t *data = NULL;
439  int flags = 0, flags_size;
440 
441  if (enc->codec_id == AV_CODEC_ID_VP6F || enc->codec_id == AV_CODEC_ID_VP6A ||
442  enc->codec_id == AV_CODEC_ID_AAC)
443  flags_size = 2;
444  else if (enc->codec_id == AV_CODEC_ID_H264)
445  flags_size = 5;
446  else
447  flags_size = 1;
448 
449  switch (enc->codec_type) {
450  case AVMEDIA_TYPE_VIDEO:
452 
453  flags = enc->codec_tag;
454  if (flags == 0) {
455  av_log(s, AV_LOG_ERROR,
456  "video codec %X not compatible with flv\n",
457  enc->codec_id);
458  return -1;
459  }
460 
462  break;
463  case AVMEDIA_TYPE_AUDIO:
464  flags = get_audio_flags(s, enc);
465 
466  assert(size);
467 
469  break;
470  case AVMEDIA_TYPE_DATA:
472  break;
473  default:
474  return AVERROR(EINVAL);
475  }
476 
477  if (enc->codec_id == AV_CODEC_ID_H264)
478  /* check if extradata looks like MP4 */
479  if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1)
480  if (ff_avc_parse_nal_units_buf(pkt->data, &data, &size) < 0)
481  return -1;
482 
483  if (flv->delay == AV_NOPTS_VALUE)
484  flv->delay = -pkt->dts;
485 
486  if (pkt->dts < -flv->delay) {
488  "Packets are not in the proper order with respect to DTS\n");
489  return AVERROR(EINVAL);
490  }
491 
492  ts = pkt->dts + flv->delay; // add delay to force positive dts
493 
494  /* check Speex packet duration */
495  if (enc->codec_id == AV_CODEC_ID_SPEEX && ts - sc->last_ts > 160)
496  av_log(s, AV_LOG_WARNING, "Warning: Speex stream has more than "
497  "8 frames per packet. Adobe Flash "
498  "Player cannot handle this!\n");
499 
500  if (sc->last_ts < ts)
501  sc->last_ts = ts;
502 
503  avio_wb24(pb, size + flags_size);
504  avio_wb24(pb, ts);
505  avio_w8(pb, (ts >> 24) & 0x7F); // timestamps are 32 bits _signed_
506  avio_wb24(pb, flv->reserved);
507 
508  if (enc->codec_type == AVMEDIA_TYPE_DATA) {
509  int data_size;
510  int64_t metadata_size_pos = avio_tell(pb);
512  put_amf_string(pb, "onTextData");
514  avio_wb32(pb, 2);
515  put_amf_string(pb, "type");
517  put_amf_string(pb, "Text");
518  put_amf_string(pb, "text");
520  put_amf_string(pb, pkt->data);
521  put_amf_string(pb, "");
523  /* write total size of tag */
524  data_size = avio_tell(pb) - metadata_size_pos;
525  avio_seek(pb, metadata_size_pos - 10, SEEK_SET);
526  avio_wb24(pb, data_size);
527  avio_seek(pb, data_size + 10 - 3, SEEK_CUR);
528  avio_wb32(pb, data_size + 11);
529  } else {
530  avio_w8(pb,flags);
531  if (enc->codec_id == AV_CODEC_ID_VP6F || enc->codec_id == AV_CODEC_ID_VP6A) {
532  if (enc->extradata_size)
533  avio_w8(pb, enc->extradata[0]);
534  else
535  avio_w8(pb, ((FFALIGN(enc->width, 16) - enc->width) << 4) |
536  (FFALIGN(enc->height, 16) - enc->height));
537  } else if (enc->codec_id == AV_CODEC_ID_AAC)
538  avio_w8(pb, 1); // AAC raw
539  else if (enc->codec_id == AV_CODEC_ID_H264) {
540  avio_w8(pb, 1); // AVC NALU
541  avio_wb24(pb, pkt->pts - pkt->dts);
542  }
543 
544  avio_write(pb, data ? data : pkt->data, size);
545 
546  avio_wb32(pb, size + flags_size + 11); // previous tag size
547  flv->duration = FFMAX(flv->duration,
548  pkt->pts + flv->delay + pkt->duration);
549  }
550 
551  av_free(data);
552 
553  return pb->error;
554 }
555 
557  .name = "flv",
558  .long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
559  .mime_type = "video/x-flv",
560  .extensions = "flv",
561  .priv_data_size = sizeof(FLVContext),
563  .video_codec = AV_CODEC_ID_FLV1,
567  .codec_tag = (const AVCodecTag* const []) {
569  },
572 };
void avio_wb64(AVIOContext *s, uint64_t val)
Definition: aviobuf.c:330
static const AVCodecTag flv_audio_codec_ids[]
Definition: flvenc.c:43
Bytestream IO Context.
Definition: avio.h:68
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
int size
AVOutputFormat ff_flv_muxer
Definition: flvenc.c:556
int64_t delay
first dts delay (needed for AVC & Speex)
Definition: flvenc.c:62
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:129
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:2821
static int write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: assenc.c:58
int64_t duration
Definition: flvenc.c:61
int num
numerator
Definition: rational.h:44
int size
Definition: avcodec.h:974
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:186
signifies 5512Hz and 8000Hz in the case of NELLYMOSER
Definition: flv.h:71
static av_always_inline uint64_t av_double2int(double f)
Reinterpret a double as a 64-bit integer.
Definition: intfloat.h:70
void * priv_data
Definition: avformat.h:719
static int get_audio_flags(AVFormatContext *s, AVCodecContext *enc)
Definition: flvenc.c:69
#define AVFMT_TS_NONSTRICT
Format does not require strictly increasing timestamps, but they must still be monotonic.
Definition: avformat.h:426
#define FFALIGN(x, a)
Definition: common.h:62
#define CONFIG_LIBMP3LAME
Definition: config.h:315
static const AVCodecTag flv_video_codec_ids[]
Definition: flvenc.c:33
Format I/O context.
Definition: avformat.h:922
internal metadata API header see avformat.h or the public API!
Public dictionary API.
uint8_t
Opaque data information usually continuous.
Definition: avutil.h:189
#define b
Definition: input.c:52
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1164
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:990
const char data[16]
Definition: mxf.c:70
static double av_q2d(AVRational a)
Convert rational to double.
Definition: rational.h:69
AVDictionaryEntry * av_dict_get(const AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
Get a dictionary entry with matching key.
Definition: dict.c:38
uint8_t * data
Definition: avcodec.h:973
static int flags
Definition: log.c:44
uint32_t tag
Definition: movenc.c:844
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:219
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2507
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:165
int duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:991
static int write_trailer(AVFormatContext *s)
Definition: assenc.c:64
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1019
static int flv_write_trailer(AVFormatContext *s)
Definition: flvenc.c:397
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1130
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:186
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:150
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:379
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:168
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:780
#define FFMAX(a, b)
Definition: common.h:55
int ff_avc_parse_nal_units_buf(const uint8_t *buf_in, uint8_t **buf, int *size)
Definition: avc.c:92
Definition: flv.h:62
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:979
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:718
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:978
#define FLV_AUDIO_CODECID_OFFSET
Definition: flv.h:34
int bit_rate
the average bitrate
Definition: avcodec.h:1114
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avutil.h:234
static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: flvenc.c:430
int width
picture width / height.
Definition: avcodec.h:1224
#define AVFMT_GLOBALHEADER
Format wants global header.
Definition: avformat.h:415
void avio_wb24(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:354
static av_always_inline int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: avio.h:210
const char * name
Definition: avformat.h:446
int reserved
Definition: flvenc.c:58
NULL
Definition: eval.c:55
FLV common header.
enum AVMediaType codec_type
Definition: avcodec.h:1058
enum AVCodecID codec_id
Definition: avcodec.h:1067
int sample_rate
samples per second
Definition: avcodec.h:1791
AVIOContext * pb
I/O context.
Definition: avformat.h:964
static int flv_write_header(AVFormatContext *s)
Definition: flvenc.c:190
void avio_w8(AVIOContext *s, int b)
Definition: aviobuf.c:144
main external API structure.
Definition: avcodec.h:1050
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1082
static void put_amf_string(AVIOContext *pb, const char *str)
Definition: flvenc.c:158
int extradata_size
Definition: avcodec.h:1165
static void put_amf_double(AVIOContext *pb, double d)
Definition: flvenc.c:178
int error
contains the error code or 0 if no error happened
Definition: avio.h:102
#define AMF_END_OF_OBJECT
Definition: flv.h:47
static void put_amf_bool(AVIOContext *pb, int b)
Definition: flvenc.c:184
void avio_wb16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:342
Main libavformat public API header.
int64_t duration_offset
Definition: flvenc.c:59
raw UTF-8 text
Definition: avcodec.h:452
char * key
Definition: dict.h:75
int den
denominator
Definition: rational.h:45
static void put_avc_eos_tag(AVIOContext *pb, unsigned ts)
Definition: flvenc.c:165
#define AVFMT_VARIABLE_FPS
Format allows variable fps.
Definition: avformat.h:419
char * value
Definition: dict.h:76
int len
int channels
number of audio channels
Definition: avcodec.h:1792
void * priv_data
Format private data.
Definition: avformat.h:950
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:380
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:972
void avio_wb32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:268
int64_t duration
Duration of the stream, in AV_TIME_BASE fractional seconds.
Definition: avformat.h:1017
#define AV_DICT_IGNORE_SUFFIX
Definition: dict.h:62
int64_t filesize_offset
Definition: flvenc.c:60
int stream_index
Definition: avcodec.h:975
This structure stores compressed data.
Definition: avcodec.h:950
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:205
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:966
int64_t last_ts
last timestamp for each stream
Definition: flvenc.c:66
int ff_isom_write_avcc(AVIOContext *pb, const uint8_t *data, int len)
Definition: avc.c:106
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:228