FFmpeg  4.0
dvenc.c
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1 /*
2  * General DV muxer/demuxer
3  * Copyright (c) 2003 Roman Shaposhnik
4  *
5  * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
6  * of DV technical info.
7  *
8  * Raw DV format
9  * Copyright (c) 2002 Fabrice Bellard
10  *
11  * 50 Mbps (DVCPRO50) support
12  * Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>
13  *
14  * This file is part of FFmpeg.
15  *
16  * FFmpeg is free software; you can redistribute it and/or
17  * modify it under the terms of the GNU Lesser General Public
18  * License as published by the Free Software Foundation; either
19  * version 2.1 of the License, or (at your option) any later version.
20  *
21  * FFmpeg is distributed in the hope that it will be useful,
22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24  * Lesser General Public License for more details.
25  *
26  * You should have received a copy of the GNU Lesser General Public
27  * License along with FFmpeg; if not, write to the Free Software
28  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29  */
30 #include <time.h>
31 #include <stdarg.h>
32 
33 #include "avformat.h"
34 #include "internal.h"
35 #include "libavcodec/dv_profile.h"
36 #include "libavcodec/dv.h"
37 #include "dv.h"
38 #include "libavutil/avassert.h"
39 #include "libavutil/fifo.h"
40 #include "libavutil/mathematics.h"
41 #include "libavutil/intreadwrite.h"
42 #include "libavutil/opt.h"
43 #include "libavutil/timecode.h"
44 
45 #define MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32-bit audio
46 
47 struct DVMuxContext {
49  const AVDVProfile* sys; /* current DV profile, e.g.: 525/60, 625/50 */
50  int n_ast; /* number of stereo audio streams (up to 2) */
51  AVStream *ast[2]; /* stereo audio streams */
52  AVFifoBuffer *audio_data[2]; /* FIFO for storing excessive amounts of PCM */
53  int frames; /* current frame number */
54  int64_t start_time; /* recording start time */
55  int has_audio; /* frame under construction has audio */
56  int has_video; /* frame under construction has video */
57  uint8_t frame_buf[DV_MAX_FRAME_SIZE]; /* frame under construction */
58  AVTimecode tc; /* timecode context */
59 };
60 
61 static const int dv_aaux_packs_dist[12][9] = {
62  { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
63  { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
64  { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
65  { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
66  { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
67  { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
68  { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
69  { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
70  { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
71  { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
72  { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
73  { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
74 };
75 
76 static int dv_audio_frame_size(const AVDVProfile* sys, int frame, int sample_rate)
77 {
78  if ((sys->time_base.den == 25 || sys->time_base.den == 50) && sys->time_base.num == 1) {
79  if (sample_rate == 32000) return 1280;
80  else if (sample_rate == 44100) return 1764;
81  else return 1920;
82  }
83 
84  av_assert0(sample_rate == 48000);
85 
86  return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist) /
87  sizeof(sys->audio_samples_dist[0]))];
88 }
89 
90 static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf, ...)
91 {
92  struct tm tc;
93  time_t ct;
94  uint32_t timecode;
95  va_list ap;
96  int audio_type = 0;
97  int channel;
98 
99  buf[0] = (uint8_t)pack_id;
100  switch (pack_id) {
101  case dv_timecode:
102  timecode = av_timecode_get_smpte_from_framenum(&c->tc, c->frames);
103  timecode |= 1<<23 | 1<<15 | 1<<7 | 1<<6; // biphase and binary group flags
104  AV_WB32(buf + 1, timecode);
105  break;
106  case dv_audio_source: /* AAUX source pack */
107  va_start(ap, buf);
108  channel = va_arg(ap, int);
109  if (c->ast[channel]->codecpar->sample_rate == 44100) {
110  audio_type = 1;
111  } else if (c->ast[channel]->codecpar->sample_rate == 32000)
112  audio_type = 2;
113  buf[1] = (1 << 7) | /* locked mode -- SMPTE only supports locked mode */
114  (1 << 6) | /* reserved -- always 1 */
115  (dv_audio_frame_size(c->sys, c->frames, c->ast[channel]->codecpar->sample_rate) -
116  c->sys->audio_min_samples[audio_type]);
117  /* # of samples */
118  buf[2] = (0 << 7) | /* multi-stereo */
119  (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */
120  (0 << 4) | /* pair bit: 0 -- one pair of channels */
121  !!va_arg(ap, int); /* audio mode */
122  buf[3] = (1 << 7) | /* res */
123  (1 << 6) | /* multi-language flag */
124  (c->sys->dsf << 5) | /* system: 60fields/50fields */
125  (c->sys->n_difchan & 2); /* definition: 0 -- 25Mbps, 2 -- 50Mbps */
126  buf[4] = (1 << 7) | /* emphasis: 1 -- off */
127  (0 << 6) | /* emphasis time constant: 0 -- reserved */
128  (audio_type << 3) | /* frequency: 0 -- 48kHz, 1 -- 44,1kHz, 2 -- 32kHz */
129  0; /* quantization: 0 -- 16-bit linear, 1 -- 12-bit nonlinear */
130 
131  va_end(ap);
132  break;
133  case dv_audio_control:
134  buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */
135  (1 << 4) | /* input source: 1 -- digital input */
136  (3 << 2) | /* compression: 3 -- no information */
137  0; /* misc. info/SMPTE emphasis off */
138  buf[2] = (1 << 7) | /* recording start point: 1 -- no */
139  (1 << 6) | /* recording end point: 1 -- no */
140  (1 << 3) | /* recording mode: 1 -- original */
141  7;
142  buf[3] = (1 << 7) | /* direction: 1 -- forward */
143  (c->sys->pix_fmt == AV_PIX_FMT_YUV420P ? 0x20 : /* speed */
144  c->sys->ltc_divisor * 4);
145  buf[4] = (1 << 7) | /* reserved -- always 1 */
146  0x7f; /* genre category */
147  break;
148  case dv_audio_recdate:
149  case dv_video_recdate: /* VAUX recording date */
150  ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num,
152  ff_brktimegm(ct, &tc);
153  buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */
154  /* 0xff is very likely to be "unknown" */
155  buf[2] = (3 << 6) | /* reserved -- always 1 */
156  ((tc.tm_mday / 10) << 4) | /* Tens of day */
157  (tc.tm_mday % 10); /* Units of day */
158  buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */
159  ((tc.tm_mon / 10) << 4) | /* Tens of month */
160  (tc.tm_mon % 10); /* Units of month */
161  buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */
162  (tc.tm_year % 10); /* Units of year */
163  break;
164  case dv_audio_rectime: /* AAUX recording time */
165  case dv_video_rectime: /* VAUX recording time */
166  ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num,
168  ff_brktimegm(ct, &tc);
169  buf[1] = (3 << 6) | /* reserved -- always 1 */
170  0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */
171  buf[2] = (1 << 7) | /* reserved -- always 1 */
172  ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
173  (tc.tm_sec % 10); /* Units of seconds */
174  buf[3] = (1 << 7) | /* reserved -- always 1 */
175  ((tc.tm_min / 10) << 4) | /* Tens of minutes */
176  (tc.tm_min % 10); /* Units of minutes */
177  buf[4] = (3 << 6) | /* reserved -- always 1 */
178  ((tc.tm_hour / 10) << 4) | /* Tens of hours */
179  (tc.tm_hour % 10); /* Units of hours */
180  break;
181  default:
182  buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
183  }
184  return 5;
185 }
186 
187 static void dv_inject_audio(DVMuxContext *c, int channel, uint8_t* frame_ptr)
188 {
189  int i, j, d, of, size;
190  size = 4 * dv_audio_frame_size(c->sys, c->frames, c->ast[channel]->codecpar->sample_rate);
191  frame_ptr += channel * c->sys->difseg_size * 150 * 80;
192  for (i = 0; i < c->sys->difseg_size; i++) {
193  frame_ptr += 6 * 80; /* skip DIF segment header */
194  for (j = 0; j < 9; j++) {
195  dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3], channel, i >= c->sys->difseg_size/2);
196  for (d = 8; d < 80; d+=2) {
197  of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride;
198  if (of*2 >= size)
199  continue;
200 
201  frame_ptr[d] = *av_fifo_peek2(c->audio_data[channel], of*2+1); // FIXME: maybe we have to admit
202  frame_ptr[d+1] = *av_fifo_peek2(c->audio_data[channel], of*2); // that DV is a big-endian PCM
203  }
204  frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
205  }
206  }
207 }
208 
210 {
211  int j, k;
212  uint8_t* buf;
213 
214  for (buf = frame; buf < frame + c->sys->frame_size; buf += 150 * 80) {
215  /* DV subcode: 2nd and 3d DIFs */
216  for (j = 80; j < 80 * 3; j += 80) {
217  for (k = 6; k < 6 * 8; k += 8)
218  dv_write_pack(dv_timecode, c, &buf[j+k]);
219 
220  if (((long)(buf-frame)/(c->sys->frame_size/(c->sys->difseg_size*c->sys->n_difchan))%c->sys->difseg_size) > 5) { /* FIXME: is this really needed ? */
221  dv_write_pack(dv_video_recdate, c, &buf[j+14]);
222  dv_write_pack(dv_video_rectime, c, &buf[j+22]);
223  dv_write_pack(dv_video_recdate, c, &buf[j+38]);
224  dv_write_pack(dv_video_rectime, c, &buf[j+46]);
225  }
226  }
227 
228  /* DV VAUX: 4th, 5th and 6th 3DIFs */
229  for (j = 80*3 + 3; j < 80*6; j += 80) {
230  dv_write_pack(dv_video_recdate, c, &buf[j+5*2]);
231  dv_write_pack(dv_video_rectime, c, &buf[j+5*3]);
232  dv_write_pack(dv_video_recdate, c, &buf[j+5*11]);
233  dv_write_pack(dv_video_rectime, c, &buf[j+5*12]);
234  }
235  }
236 }
237 
238 /*
239  * The following 3 functions constitute our interface to the world
240  */
241 
243  DVMuxContext *c, AVStream* st,
244  uint8_t* data, int data_size, uint8_t** frame)
245 {
246  int i, reqasize;
247 
248  *frame = &c->frame_buf[0];
249 
250  switch (st->codecpar->codec_type) {
251  case AVMEDIA_TYPE_VIDEO:
252  /* FIXME: we have to have more sensible approach than this one */
253  if (c->has_video)
254  av_log(s, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);
255  if (data_size != c->sys->frame_size) {
256  av_log(s, AV_LOG_ERROR, "Unexpected frame size, %d != %d\n",
257  data_size, c->sys->frame_size);
258  return AVERROR(ENOSYS);
259  }
260 
261  memcpy(*frame, data, c->sys->frame_size);
262  c->has_video = 1;
263  break;
264  case AVMEDIA_TYPE_AUDIO:
265  for (i = 0; i < c->n_ast && st != c->ast[i]; i++);
266 
267  /* FIXME: we have to have more sensible approach than this one */
268  if (av_fifo_size(c->audio_data[i]) + data_size >= 100*MAX_AUDIO_FRAME_SIZE)
269  av_log(s, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);
270  av_fifo_generic_write(c->audio_data[i], data, data_size, NULL);
271 
272  reqasize = 4 * dv_audio_frame_size(c->sys, c->frames, st->codecpar->sample_rate);
273 
274  /* Let us see if we've got enough audio for one DV frame. */
275  c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i);
276 
277  break;
278  default:
279  break;
280  }
281 
282  /* Let us see if we have enough data to construct one DV frame. */
283  if (c->has_video == 1 && c->has_audio + 1 == 1 << c->n_ast) {
284  dv_inject_metadata(c, *frame);
285  c->has_audio = 0;
286  for (i=0; i < c->n_ast; i++) {
287  dv_inject_audio(c, i, *frame);
288  reqasize = 4 * dv_audio_frame_size(c->sys, c->frames, c->ast[i]->codecpar->sample_rate);
289  av_fifo_drain(c->audio_data[i], reqasize);
290  c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i);
291  }
292 
293  c->has_video = 0;
294 
295  c->frames++;
296 
297  return c->sys->frame_size;
298  }
299 
300  return 0;
301 }
302 
304 {
305  DVMuxContext *c = s->priv_data;
306  AVStream *vst = NULL;
307  int i;
308 
309  /* we support at most 1 video and 2 audio streams */
310  if (s->nb_streams > 3)
311  return NULL;
312 
313  c->n_ast = 0;
314  c->ast[0] = c->ast[1] = NULL;
315 
316  /* We have to sort out where audio and where video stream is */
317  for (i=0; i<s->nb_streams; i++) {
318  switch (s->streams[i]->codecpar->codec_type) {
319  case AVMEDIA_TYPE_VIDEO:
320  if (vst) return NULL;
321  vst = s->streams[i];
322  break;
323  case AVMEDIA_TYPE_AUDIO:
324  if (c->n_ast > 1) return NULL;
325  c->ast[c->n_ast++] = s->streams[i];
326  break;
327  default:
328  goto bail_out;
329  }
330  }
331 
332  /* Some checks -- DV format is very picky about its incoming streams */
333  if (!vst || vst->codecpar->codec_id != AV_CODEC_ID_DVVIDEO)
334  goto bail_out;
335  for (i=0; i<c->n_ast; i++) {
336  if (c->ast[i]) {
337  if(c->ast[i]->codecpar->codec_id != AV_CODEC_ID_PCM_S16LE ||
338  c->ast[i]->codecpar->channels != 2)
339  goto bail_out;
340  if (c->ast[i]->codecpar->sample_rate != 48000 &&
341  c->ast[i]->codecpar->sample_rate != 44100 &&
342  c->ast[i]->codecpar->sample_rate != 32000 )
343  goto bail_out;
344  }
345  }
347  vst->codecpar->format, vst->time_base);
348  if (!c->sys)
349  goto bail_out;
350 
351  if ((c->sys->time_base.den != 25 && c->sys->time_base.den != 50) || c->sys->time_base.num != 1) {
352  if (c->ast[0] && c->ast[0]->codecpar->sample_rate != 48000)
353  goto bail_out;
354  if (c->ast[1] && c->ast[1]->codecpar->sample_rate != 48000)
355  goto bail_out;
356  }
357 
358  if ((c->n_ast > 1) && (c->sys->n_difchan < 2)) {
359  /* only 1 stereo pair is allowed in 25Mbps mode */
360  goto bail_out;
361  }
362 
363  /* Ok, everything seems to be in working order */
364  c->frames = 0;
365  c->has_audio = 0;
366  c->has_video = 0;
368 
369  for (i=0; i < c->n_ast; i++) {
370  if (c->ast[i] && !(c->audio_data[i]=av_fifo_alloc_array(100, MAX_AUDIO_FRAME_SIZE))) {
371  while (i > 0) {
372  i--;
373  av_fifo_freep(&c->audio_data[i]);
374  }
375  goto bail_out;
376  }
377  }
378 
379  return c;
380 
381 bail_out:
382  return NULL;
383 }
384 
386 {
387  int i;
388  for (i=0; i < c->n_ast; i++)
389  av_fifo_freep(&c->audio_data[i]);
390 }
391 
393 {
394  AVRational rate;
395  DVMuxContext *dvc = s->priv_data;
396  AVDictionaryEntry *tcr = av_dict_get(s->metadata, "timecode", NULL, 0);
397 
398  if (!dv_init_mux(s)) {
399  av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n"
400  "Make sure that you supply exactly two streams:\n"
401  " video: 25fps or 29.97fps, audio: 2ch/48|44|32kHz/PCM\n"
402  " (50Mbps allows an optional second audio stream)\n");
403  return -1;
404  }
405  rate.num = dvc->sys->ltc_divisor;
406  rate.den = 1;
407  if (!tcr) { // no global timecode, look into the streams
408  int i;
409  for (i = 0; i < s->nb_streams; i++) {
410  tcr = av_dict_get(s->streams[i]->metadata, "timecode", NULL, 0);
411  if (tcr)
412  break;
413  }
414  }
415  if (tcr && av_timecode_init_from_string(&dvc->tc, rate, tcr->value, s) >= 0)
416  return 0;
417  return av_timecode_init(&dvc->tc, rate, 0, 0, s);
418 }
419 
421 {
422  uint8_t* frame;
423  int fsize;
424 
425  fsize = dv_assemble_frame(s, s->priv_data, s->streams[pkt->stream_index],
426  pkt->data, pkt->size, &frame);
427  if (fsize > 0) {
428  avio_write(s->pb, frame, fsize);
429  }
430  return 0;
431 }
432 
433 /*
434  * We might end up with some extra A/V data without matching counterpart.
435  * E.g. video data without enough audio to write the complete frame.
436  * Currently we simply drop the last frame. I don't know whether this
437  * is the best strategy of all
438  */
439 static int dv_write_trailer(struct AVFormatContext *s)
440 {
442  return 0;
443 }
444 
446  .name = "dv",
447  .long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
448  .extensions = "dv",
449  .priv_data_size = sizeof(DVMuxContext),
450  .audio_codec = AV_CODEC_ID_PCM_S16LE,
451  .video_codec = AV_CODEC_ID_DVVIDEO,
455 };
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int unqueue)
Definition: ffmpeg.c:679
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:768
int size
int ltc_divisor
Definition: dv_profile.h:46
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3884
int num
Numerator.
Definition: rational.h:59
int size
Definition: avcodec.h:1431
AVTimecode tc
Definition: dvenc.c:58
static AVPacket pkt
int audio_samples_dist[5]
Definition: dv_profile.h:56
int av_fifo_generic_write(AVFifoBuffer *f, void *src, int size, int(*func)(void *, void *, int))
Feed data from a user-supplied callback to an AVFifoBuffer.
Definition: fifo.c:122
Format I/O context.
Definition: avformat.h:1342
int64_t start_time
Definition: dvenc.c:54
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
int av_timecode_init_from_string(AVTimecode *tc, AVRational rate, const char *str, void *log_ctx)
Parse timecode representation (hh:mm:ss[:;.
Definition: timecode.c:194
dv_pack_type
Definition: dv.h:67
uint8_t
#define MAX_AUDIO_FRAME_SIZE
Definition: dvenc.c:45
int width
Video only.
Definition: avcodec.h:3950
AVFifoBuffer * audio_data[2]
Definition: dvenc.c:52
const AVDVProfile * sys
Definition: dvenc.c:49
AVOptions.
AVStream * ast[2]
Definition: dvenc.c:51
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1410
static AVFrame * frame
const char data[16]
Definition: mxf.c:90
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
static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t *buf,...)
Definition: dvenc.c:90
int difseg_size
Definition: dv_profile.h:43
uint8_t * data
Definition: avcodec.h:1430
static void dv_inject_metadata(DVMuxContext *c, uint8_t *frame)
Definition: dvenc.c:209
enum AVPixelFormat pix_fmt
Definition: dv_profile.h:50
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:218
AVRational time_base
Definition: dv_profile.h:45
#define av_log(a,...)
const uint8_t(* audio_shuffle)[9]
Definition: dv_profile.h:58
int av_timecode_init(AVTimecode *tc, AVRational rate, int flags, int frame_start, void *log_ctx)
Init a timecode struct with the passed parameters.
Definition: timecode.c:184
int ff_parse_creation_time_metadata(AVFormatContext *s, int64_t *timestamp, int return_seconds)
Parse creation_time in AVFormatContext metadata if exists and warn if the parsing fails...
Definition: utils.c:5611
int audio_min_samples[3]
Definition: dv_profile.h:54
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static uint8_t * av_fifo_peek2(const AVFifoBuffer *f, int offs)
Return a pointer to the data stored in a FIFO buffer at a certain offset.
Definition: fifo.h:169
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1580
static void dv_inject_audio(DVMuxContext *c, int channel, uint8_t *frame_ptr)
Definition: dvenc.c:187
#define AVERROR(e)
Definition: error.h:43
static int dv_audio_frame_size(const AVDVProfile *sys, int frame, int sample_rate)
Definition: dvenc.c:76
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
int frame_size
Definition: dv_profile.h:42
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3880
simple assert() macros that are a bit more flexible than ISO C assert().
AVClass * av_class
Definition: dvenc.c:48
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1398
struct tm * ff_brktimegm(time_t secs, struct tm *tm)
Definition: cutils.c:31
int n_ast
Definition: dvenc.c:50
static int dv_write_header(AVFormatContext *s)
Definition: dvenc.c:392
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:94
const char * name
Definition: avformat.h:507
AVDictionary * metadata
Definition: avformat.h:937
int has_video
Definition: dvenc.c:56
int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd)
Rescale a 64-bit integer with specified rounding.
Definition: mathematics.c:58
if(ret< 0)
Definition: vf_mcdeint.c:279
Stream structure.
Definition: avformat.h:873
sample_rate
int has_audio
Definition: dvenc.c:55
Definition: dv.h:70
int av_fifo_size(const AVFifoBuffer *f)
Return the amount of data in bytes in the AVFifoBuffer, that is the amount of data you can read from ...
Definition: fifo.c:77
Timecode helpers header.
AVIOContext * pb
I/O context.
Definition: avformat.h:1384
#define DV_MAX_FRAME_SIZE
largest possible DV frame, in bytes (1080i50)
Definition: dv.h:89
a very simple circular buffer FIFO implementation
static int dv_assemble_frame(AVFormatContext *s, DVMuxContext *c, AVStream *st, uint8_t *data, int data_size, uint8_t **frame)
Definition: dvenc.c:242
static int dv_write_trailer(struct AVFormatContext *s)
Definition: dvenc.c:439
void * buf
Definition: avisynth_c.h:690
int audio_stride
Definition: dv_profile.h:53
Describe the class of an AVClass context structure.
Definition: log.h:67
#define AV_WB32(p, v)
Definition: intreadwrite.h:419
Rational number (pair of numerator and denominator).
Definition: rational.h:58
static const int dv_aaux_packs_dist[12][9]
Definition: dvenc.c:61
Round toward -infinity.
Definition: mathematics.h:82
static DVMuxContext * dv_init_mux(AVFormatContext *s)
Definition: dvenc.c:303
AVFifoBuffer * av_fifo_alloc_array(size_t nmemb, size_t size)
Initialize an AVFifoBuffer.
Definition: fifo.c:49
uint8_t frame_buf[DV_MAX_FRAME_SIZE]
Definition: dvenc.c:57
int sample_rate
Audio only.
Definition: avcodec.h:3994
Main libavformat public API header.
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:62
static double c[64]
channel
Use these values when setting the channel map with ebur128_set_channel().
Definition: ebur128.h:39
Constants for DV codec.
int den
Denominator.
Definition: rational.h:60
const AVDVProfile * av_dv_codec_profile2(int width, int height, enum AVPixelFormat pix_fmt, AVRational frame_rate)
Get a DV profile for the provided stream parameters.
Definition: dv_profile.c:316
char * value
Definition: dict.h:87
void * priv_data
Format private data.
Definition: avformat.h:1370
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:337
int frames
Definition: dvenc.c:53
AVOutputFormat ff_dv_muxer
Definition: dvenc.c:445
int channels
Audio only.
Definition: avcodec.h:3990
void av_fifo_freep(AVFifoBuffer **f)
Free an AVFifoBuffer and reset pointer to NULL.
Definition: fifo.c:63
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1020
static int64_t fsize(FILE *f)
Definition: audiomatch.c:28
int n_difchan
Definition: dv_profile.h:44
int stream_index
Definition: avcodec.h:1432
static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt)
Definition: dvenc.c:420
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:902
void av_fifo_drain(AVFifoBuffer *f, int size)
Discard data from the FIFO.
Definition: fifo.c:233
This structure stores compressed data.
Definition: avcodec.h:1407
static void dv_delete_mux(DVMuxContext *c)
Definition: dvenc.c:385
uint32_t av_timecode_get_smpte_from_framenum(const AVTimecode *tc, int framenum)
Convert frame number to SMPTE 12M binary representation.
Definition: timecode.c:55