FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
rmenc.c
Go to the documentation of this file.
1 /*
2  * "Real" compatible muxer.
3  * Copyright (c) 2000, 2001 Fabrice Bellard
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 "avformat.h"
22 #include "avio_internal.h"
23 #include "rm.h"
24 #include "libavutil/dict.h"
25 
26 typedef struct StreamInfo {
30  /* codec related output */
31  int bit_rate;
33  int nb_frames; /* current frame number */
34  int total_frames; /* total number of frames */
35  int num;
37 } StreamInfo;
38 
39 typedef struct RMMuxContext {
42  int data_pos; /* position of the data after the header */
43 } RMMuxContext;
44 
45 /* in ms */
46 #define BUFFER_DURATION 0
47 /* the header needs at most 7 + 4 + 12 B */
48 #define MAX_HEADER_SIZE (7 + 4 + 12)
49 /* UINT16_MAX is the maximal chunk size */
50 #define MAX_PACKET_SIZE (UINT16_MAX - MAX_HEADER_SIZE)
51 
52 
53 static void put_str(AVIOContext *s, const char *tag)
54 {
55  avio_wb16(s,strlen(tag));
56  while (*tag) {
57  avio_w8(s, *tag++);
58  }
59 }
60 
61 static void put_str8(AVIOContext *s, const char *tag)
62 {
63  avio_w8(s, strlen(tag));
64  while (*tag) {
65  avio_w8(s, *tag++);
66  }
67 }
68 
70  int data_size, int index_pos)
71 {
72  RMMuxContext *rm = ctx->priv_data;
73  AVIOContext *s = ctx->pb;
74  StreamInfo *stream;
75  const char *desc, *mimetype;
76  int nb_packets, packet_total_size, packet_max_size, size, packet_avg_size, i;
77  int bit_rate, v, duration, flags;
78  int data_offset;
80 
81  ffio_wfourcc(s, ".RMF");
82  avio_wb32(s,18); /* header size */
83  avio_wb16(s,0);
84  avio_wb32(s,0);
85  avio_wb32(s,4 + ctx->nb_streams); /* num headers */
86 
87  ffio_wfourcc(s,"PROP");
88  avio_wb32(s, 50);
89  avio_wb16(s, 0);
90  packet_max_size = 0;
91  packet_total_size = 0;
92  nb_packets = 0;
93  bit_rate = 0;
94  duration = 0;
95  for(i=0;i<ctx->nb_streams;i++) {
96  StreamInfo *stream = &rm->streams[i];
97  bit_rate += stream->bit_rate;
98  if (stream->packet_max_size > packet_max_size)
99  packet_max_size = stream->packet_max_size;
100  nb_packets += stream->nb_packets;
101  packet_total_size += stream->packet_total_size;
102  /* select maximum duration */
103  v = av_rescale_q_rnd(stream->total_frames, (AVRational){1000, 1}, stream->frame_rate, AV_ROUND_ZERO);
104  if (v > duration)
105  duration = v;
106  }
107  avio_wb32(s, bit_rate); /* max bit rate */
108  avio_wb32(s, bit_rate); /* avg bit rate */
109  avio_wb32(s, packet_max_size); /* max packet size */
110  if (nb_packets > 0)
111  packet_avg_size = packet_total_size / nb_packets;
112  else
113  packet_avg_size = 0;
114  avio_wb32(s, packet_avg_size); /* avg packet size */
115  avio_wb32(s, nb_packets); /* num packets */
116  avio_wb32(s, duration); /* duration */
117  avio_wb32(s, BUFFER_DURATION); /* preroll */
118  avio_wb32(s, index_pos); /* index offset */
119  /* computation of data the data offset */
120  data_offset = avio_tell(s);
121  avio_wb32(s, 0); /* data offset : will be patched after */
122  avio_wb16(s, ctx->nb_streams); /* num streams */
123  flags = 1 | 2; /* save allowed & perfect play */
124  if (!(s->seekable & AVIO_SEEKABLE_NORMAL))
125  flags |= 4; /* live broadcast */
126  avio_wb16(s, flags);
127 
128  /* comments */
129 
130  ffio_wfourcc(s,"CONT");
131  size = 4 * 2 + 10;
132  for(i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
134  if(tag) size += strlen(tag->value);
135  }
136  avio_wb32(s,size);
137  avio_wb16(s,0);
138  for(i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
140  put_str(s, tag ? tag->value : "");
141  }
142 
143  for(i=0;i<ctx->nb_streams;i++) {
144  int codec_data_size;
145 
146  stream = &rm->streams[i];
147 
148  if (stream->par->codec_type == AVMEDIA_TYPE_AUDIO) {
149  desc = "The Audio Stream";
150  mimetype = "audio/x-pn-realaudio";
151  codec_data_size = 73;
152  } else {
153  desc = "The Video Stream";
154  mimetype = "video/x-pn-realvideo";
155  codec_data_size = 34;
156  }
157 
158  ffio_wfourcc(s,"MDPR");
159  size = 10 + 9 * 4 + strlen(desc) + strlen(mimetype) + codec_data_size;
160  avio_wb32(s, size);
161  avio_wb16(s, 0);
162 
163  avio_wb16(s, i); /* stream number */
164  avio_wb32(s, stream->bit_rate); /* max bit rate */
165  avio_wb32(s, stream->bit_rate); /* avg bit rate */
166  avio_wb32(s, stream->packet_max_size); /* max packet size */
167  if (stream->nb_packets > 0)
168  packet_avg_size = stream->packet_total_size /
169  stream->nb_packets;
170  else
171  packet_avg_size = 0;
172  avio_wb32(s, packet_avg_size); /* avg packet size */
173  avio_wb32(s, 0); /* start time */
174  avio_wb32(s, BUFFER_DURATION); /* preroll */
175  /* duration */
176  if (!(s->seekable & AVIO_SEEKABLE_NORMAL) || !stream->total_frames)
177  avio_wb32(s, (int)(3600 * 1000));
178  else
179  avio_wb32(s, av_rescale_q_rnd(stream->total_frames, (AVRational){1000, 1}, stream->frame_rate, AV_ROUND_ZERO));
180  put_str8(s, desc);
181  put_str8(s, mimetype);
182  avio_wb32(s, codec_data_size);
183 
184  if (stream->par->codec_type == AVMEDIA_TYPE_AUDIO) {
185  int coded_frame_size, fscode, sample_rate;
186  int frame_size = av_get_audio_frame_duration2(stream->par, 0);
187  sample_rate = stream->par->sample_rate;
188  coded_frame_size = (stream->par->bit_rate *
189  frame_size) / (8 * sample_rate);
190  /* audio codec info */
191  avio_write(s, ".ra", 3);
192  avio_w8(s, 0xfd);
193  avio_wb32(s, 0x00040000); /* version */
194  ffio_wfourcc(s, ".ra4");
195  avio_wb32(s, 0x01b53530); /* stream length */
196  avio_wb16(s, 4); /* unknown */
197  avio_wb32(s, 0x39); /* header size */
198 
199  switch(sample_rate) {
200  case 48000:
201  case 24000:
202  case 12000:
203  fscode = 1;
204  break;
205  default:
206  case 44100:
207  case 22050:
208  case 11025:
209  fscode = 2;
210  break;
211  case 32000:
212  case 16000:
213  case 8000:
214  fscode = 3;
215  }
216  avio_wb16(s, fscode); /* codec additional info, for AC-3, seems
217  to be a frequency code */
218  /* special hack to compensate rounding errors... */
219  if (coded_frame_size == 557)
220  coded_frame_size--;
221  avio_wb32(s, coded_frame_size); /* frame length */
222  avio_wb32(s, 0x51540); /* unknown */
223  avio_wb32(s, stream->par->bit_rate / 8 * 60); /* bytes per minute */
224  avio_wb32(s, stream->par->bit_rate / 8 * 60); /* bytes per minute */
225  avio_wb16(s, 0x01);
226  /* frame length : seems to be very important */
227  avio_wb16(s, coded_frame_size);
228  avio_wb32(s, 0); /* unknown */
229  avio_wb16(s, stream->par->sample_rate); /* sample rate */
230  avio_wb32(s, 0x10); /* unknown */
231  avio_wb16(s, stream->par->channels);
232  put_str8(s, "Int0"); /* codec name */
233  if (stream->par->codec_tag) {
234  avio_w8(s, 4); /* tag length */
235  avio_wl32(s, stream->par->codec_tag);
236  } else {
237  av_log(ctx, AV_LOG_ERROR, "Invalid codec tag\n");
238  return -1;
239  }
240  avio_wb16(s, 0); /* title length */
241  avio_wb16(s, 0); /* author length */
242  avio_wb16(s, 0); /* copyright length */
243  avio_w8(s, 0); /* end of header */
244  } else {
245  /* video codec info */
246  avio_wb32(s,34); /* size */
247  ffio_wfourcc(s, "VIDO");
248  if(stream->par->codec_id == AV_CODEC_ID_RV10)
249  ffio_wfourcc(s,"RV10");
250  else
251  ffio_wfourcc(s,"RV20");
252  avio_wb16(s, stream->par->width);
253  avio_wb16(s, stream->par->height);
254 
255  if (stream->frame_rate.num / stream->frame_rate.den > 65535) {
256  av_log(s, AV_LOG_ERROR, "Frame rate %d is too high\n", stream->frame_rate.num / stream->frame_rate.den);
257  return AVERROR(EINVAL);
258  }
259 
260  avio_wb16(s, stream->frame_rate.num / stream->frame_rate.den); /* frames per seconds ? */
261  avio_wb32(s,0); /* unknown meaning */
262  avio_wb16(s, stream->frame_rate.num / stream->frame_rate.den); /* unknown meaning */
263  avio_wb32(s,0); /* unknown meaning */
264  avio_wb16(s, 8); /* unknown meaning */
265  /* Seems to be the codec version: only use basic H.263. The next
266  versions seems to add a differential DC coding as in
267  MPEG... nothing new under the sun. */
268  if(stream->par->codec_id == AV_CODEC_ID_RV10)
269  avio_wb32(s,0x10000000);
270  else
271  avio_wb32(s,0x20103001);
272  //avio_wb32(s,0x10003000);
273  }
274  }
275 
276  /* patch data offset field */
277  rm->data_pos = avio_tell(s);
278  if (avio_seek(s, data_offset, SEEK_SET) >= 0) {
279  avio_wb32(s, rm->data_pos);
280  avio_seek(s, rm->data_pos, SEEK_SET);
281  }
282 
283  /* data stream */
284  ffio_wfourcc(s, "DATA");
285  avio_wb32(s,data_size + 10 + 8);
286  avio_wb16(s,0);
287 
288  avio_wb32(s, nb_packets); /* number of packets */
289  avio_wb32(s,0); /* next data header */
290  return 0;
291 }
292 
294  int length, int key_frame)
295 {
296  int timestamp;
297  AVIOContext *s = ctx->pb;
298 
299  stream->nb_packets++;
300  stream->packet_total_size += length;
301  if (length > stream->packet_max_size)
302  stream->packet_max_size = length;
303 
304  avio_wb16(s,0); /* version */
305  avio_wb16(s,length + 12);
306  avio_wb16(s, stream->num); /* stream number */
307  timestamp = av_rescale_q_rnd(stream->nb_frames, (AVRational){1000, 1}, stream->frame_rate, AV_ROUND_ZERO);
308  avio_wb32(s, timestamp); /* timestamp */
309  avio_w8(s, 0); /* reserved */
310  avio_w8(s, key_frame ? 2 : 0); /* flags */
311 }
312 
314 {
315  RMMuxContext *rm = s->priv_data;
316  StreamInfo *stream;
317  int n;
318  AVCodecParameters *par;
319 
320  if (s->nb_streams > 2) {
321  av_log(s, AV_LOG_ERROR, "At most 2 streams are currently supported for muxing in RM\n");
322  return AVERROR_PATCHWELCOME;
323  }
324 
325  for(n=0;n<s->nb_streams;n++) {
326  AVStream *st = s->streams[n];
327  int frame_size;
328 
329  s->streams[n]->id = n;
330  par = s->streams[n]->codecpar;
331  stream = &rm->streams[n];
332  memset(stream, 0, sizeof(StreamInfo));
333  stream->num = n;
334  stream->bit_rate = par->bit_rate;
335  stream->par = par;
336 
337  switch (par->codec_type) {
338  case AVMEDIA_TYPE_AUDIO:
339  rm->audio_stream = stream;
340  frame_size = av_get_audio_frame_duration2(par, 0);
341  stream->frame_rate = (AVRational){par->sample_rate, frame_size};
342  /* XXX: dummy values */
343  stream->packet_max_size = 1024;
344  stream->nb_packets = 0;
345  stream->total_frames = stream->nb_packets;
346  break;
347  case AVMEDIA_TYPE_VIDEO:
348  rm->video_stream = stream;
349  // TODO: should be avg_frame_rate
350  stream->frame_rate = av_inv_q(st->time_base);
351  /* XXX: dummy values */
352  stream->packet_max_size = 4096;
353  stream->nb_packets = 0;
354  stream->total_frames = stream->nb_packets;
355  break;
356  default:
357  return -1;
358  }
359  }
360 
361  if (rv10_write_header(s, 0, 0))
362  return AVERROR_INVALIDDATA;
363  avio_flush(s->pb);
364  return 0;
365 }
366 
367 static int rm_write_audio(AVFormatContext *s, const uint8_t *buf, int size, int flags)
368 {
369  RMMuxContext *rm = s->priv_data;
370  AVIOContext *pb = s->pb;
371  StreamInfo *stream = rm->audio_stream;
372  int i;
373 
374  write_packet_header(s, stream, size, !!(flags & AV_PKT_FLAG_KEY));
375 
376  if (stream->par->codec_id == AV_CODEC_ID_AC3) {
377  /* for AC-3, the words seem to be reversed */
378  for (i = 0; i < size; i += 2) {
379  avio_w8(pb, buf[i + 1]);
380  avio_w8(pb, buf[i]);
381  }
382  } else {
383  avio_write(pb, buf, size);
384  }
385  stream->nb_frames++;
386  return 0;
387 }
388 
389 static int rm_write_video(AVFormatContext *s, const uint8_t *buf, int size, int flags)
390 {
391  RMMuxContext *rm = s->priv_data;
392  AVIOContext *pb = s->pb;
393  StreamInfo *stream = rm->video_stream;
394  int key_frame = !!(flags & AV_PKT_FLAG_KEY);
395 
396  /* XXX: this is incorrect: should be a parameter */
397 
398  /* Well, I spent some time finding the meaning of these bits. I am
399  not sure I understood everything, but it works !! */
400  if (size > MAX_PACKET_SIZE) {
401  av_log(s, AV_LOG_ERROR, "Muxing packets larger than 64 kB (%d) is not supported\n", size);
402  return AVERROR_PATCHWELCOME;
403  }
404  write_packet_header(s, stream, size + 7 + (size >= 0x4000)*4, key_frame);
405  /* bit 7: '1' if final packet of a frame converted in several packets */
406  avio_w8(pb, 0x81);
407  /* bit 7: '1' if I-frame. bits 6..0 : sequence number in current
408  frame starting from 1 */
409  if (key_frame) {
410  avio_w8(pb, 0x81);
411  } else {
412  avio_w8(pb, 0x01);
413  }
414  if(size >= 0x4000){
415  avio_wb32(pb, size); /* total frame size */
416  avio_wb32(pb, size); /* offset from the start or the end */
417  }else{
418  avio_wb16(pb, 0x4000 | size); /* total frame size */
419  avio_wb16(pb, 0x4000 | size); /* offset from the start or the end */
420  }
421  avio_w8(pb, stream->nb_frames & 0xff);
422 
423  avio_write(pb, buf, size);
424 
425  stream->nb_frames++;
426  return 0;
427 }
428 
430 {
431  if (s->streams[pkt->stream_index]->codecpar->codec_type ==
433  return rm_write_audio(s, pkt->data, pkt->size, pkt->flags);
434  else
435  return rm_write_video(s, pkt->data, pkt->size, pkt->flags);
436 }
437 
439 {
440  RMMuxContext *rm = s->priv_data;
441  int data_size, index_pos, i;
442  AVIOContext *pb = s->pb;
443 
444  if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
445  /* end of file: finish to write header */
446  index_pos = avio_tell(pb);
447  data_size = index_pos - rm->data_pos;
448 
449  /* FIXME: write index */
450 
451  /* undocumented end header */
452  avio_wb32(pb, 0);
453  avio_wb32(pb, 0);
454 
455  avio_seek(pb, 0, SEEK_SET);
456  for(i=0;i<s->nb_streams;i++)
457  rm->streams[i].total_frames = rm->streams[i].nb_frames;
458  rv10_write_header(s, data_size, 0);
459  } else {
460  /* undocumented end header */
461  avio_wb32(pb, 0);
462  avio_wb32(pb, 0);
463  }
464 
465  return 0;
466 }
467 
468 
470  .name = "rm",
471  .long_name = NULL_IF_CONFIG_SMALL("RealMedia"),
472  .mime_type = "application/vnd.rn-realmedia",
473  .extensions = "rm,ra",
474  .priv_data_size = sizeof(RMMuxContext),
475  .audio_codec = AV_CODEC_ID_AC3,
476  .video_codec = AV_CODEC_ID_RV10,
480  .codec_tag = (const AVCodecTag* const []){ ff_rm_codec_tags, 0 },
481 };
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:671
#define NULL
Definition: coverity.c:32
static int rm_write_audio(AVFormatContext *s, const uint8_t *buf, int size, int flags)
Definition: rmenc.c:367
const char * s
Definition: avisynth_c.h:768
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int nb_packets
Definition: rmenc.c:27
const char * desc
Definition: nvenc.c:63
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3736
int size
Definition: avcodec.h:1400
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:244
static AVPacket pkt
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3728
Format I/O context.
Definition: avformat.h:1325
Public dictionary API.
int packet_total_size
Definition: rmenc.c:28
void avio_wl32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:367
uint8_t
int id
Format-specific stream ID.
Definition: avformat.h:879
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1393
int64_t duration
Definition: movenc.c:63
static void put_str(AVIOContext *s, const char *tag)
Definition: rmenc.c:53
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:40
uint8_t * data
Definition: avcodec.h:1399
static int flags
Definition: log.c:57
uint32_t tag
Definition: movenc.c:1424
AVRational frame_rate
Definition: rmenc.c:32
static void put_str8(AVIOContext *s, const char *tag)
Definition: rmenc.c:61
ptrdiff_t size
Definition: opengl_enc.c:101
StreamInfo * audio_stream
Definition: rmenc.c:41
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:558
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:216
static av_always_inline void ffio_wfourcc(AVIOContext *pb, const uint8_t *s)
Definition: avio_internal.h:58
#define av_log(a,...)
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3765
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1431
int total_frames
Definition: rmenc.c:34
StreamInfo streams[2]
Definition: rmenc.c:40
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1543
#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:190
int nb_frames
Definition: rmenc.c:33
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3732
GLsizei GLsizei * length
Definition: opengl_enc.c:115
AVCodecParameters * par
Definition: rmenc.c:36
int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes)
This function is the same as av_get_audio_frame_duration(), except it works with AVCodecParameters in...
Definition: utils.c:1850
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1405
int bit_rate
Definition: rmenc.c:31
static void write_packet_header(AVFormatContext *ctx, StreamInfo *stream, int length, int key_frame)
Definition: rmenc.c:293
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1381
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:261
int void avio_flush(AVIOContext *s)
Force flushing of buffered data.
Definition: aviobuf.c:236
Round toward zero.
Definition: mathematics.h:80
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:94
const char * name
Definition: avformat.h:507
AVFormatContext * ctx
Definition: movenc.c:48
static int rm_write_header(AVFormatContext *s)
Definition: rmenc.c:313
int n
Definition: avisynth_c.h:684
static int rm_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rmenc.c:429
#define FF_ARRAY_ELEMS(a)
Stream structure.
Definition: avformat.h:872
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
const AVCodecTag ff_rm_codec_tags[]
Definition: rm.c:31
sample_rate
int frame_size
Definition: mxfenc.c:1896
AVIOContext * pb
I/O context.
Definition: avformat.h:1367
void avio_w8(AVIOContext *s, int b)
Definition: aviobuf.c:194
void * buf
Definition: avisynth_c.h:690
#define BUFFER_DURATION
Definition: rmenc.c:46
Rational number (pair of numerator and denominator).
Definition: rational.h:58
static int rm_write_trailer(AVFormatContext *s)
Definition: rmenc.c:438
void avio_wb16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:473
const char *const ff_rm_metadata[4]
Definition: rm.c:24
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
int sample_rate
Audio only.
Definition: avcodec.h:3846
Main libavformat public API header.
int packet_max_size
Definition: rmenc.c:29
int data_pos
Definition: rmenc.c:42
AVOutputFormat ff_rm_muxer
Definition: rmenc.c:469
#define MAX_PACKET_SIZE
Definition: rmenc.c:50
static int rv10_write_header(AVFormatContext *ctx, int data_size, int index_pos)
Definition: rmenc.c:69
int num
Definition: rmenc.c:35
void * priv_data
Format private data.
Definition: avformat.h:1353
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:337
void avio_wb32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:375
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1014
int64_t av_rescale_q_rnd(int64_t a, AVRational bq, AVRational cq, enum AVRounding rnd)
Rescale a 64-bit integer by 2 rational numbers with specified rounding.
Definition: mathematics.c:134
int stream_index
Definition: avcodec.h:1401
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:901
static int rm_write_video(AVFormatContext *s, const uint8_t *buf, int size, int flags)
Definition: rmenc.c:389
This structure stores compressed data.
Definition: avcodec.h:1376
StreamInfo * video_stream
Definition: rmenc.c:41