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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/fifo.h"
39 #include "libavutil/mathematics.h"
40 #include "libavutil/intreadwrite.h"
41 #include "libavutil/opt.h"
42 #include "libavutil/timecode.h"
43 
44 #define MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32-bit audio
45 
46 struct DVMuxContext {
48  const AVDVProfile* sys; /* current DV profile, e.g.: 525/60, 625/50 */
49  int n_ast; /* number of stereo audio streams (up to 2) */
50  AVStream *ast[2]; /* stereo audio streams */
51  AVFifoBuffer *audio_data[2]; /* FIFO for storing excessive amounts of PCM */
52  int frames; /* current frame number */
53  int64_t start_time; /* recording start time */
54  int has_audio; /* frame under construction has audio */
55  int has_video; /* frame under construction has video */
56  uint8_t frame_buf[DV_MAX_FRAME_SIZE]; /* frame under construction */
57  AVTimecode tc; /* timecode context */
58 };
59 
60 static const int dv_aaux_packs_dist[12][9] = {
61  { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
62  { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
63  { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
64  { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
65  { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
66  { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
67  { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
68  { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
69  { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
70  { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
71  { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
72  { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
73 };
74 
75 static int dv_audio_frame_size(const AVDVProfile* sys, int frame, int sample_rate)
76 {
77  if ((sys->time_base.den == 25 || sys->time_base.den == 50) && sys->time_base.num == 1) {
78  if (sample_rate == 32000) return 1280;
79  else if (sample_rate == 44100) return 1764;
80  else return 1920;
81  }
82 
83  av_assert0(sample_rate == 48000);
84 
85  return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist) /
86  sizeof(sys->audio_samples_dist[0]))];
87 }
88 
89 static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf, ...)
90 {
91  struct tm tc;
92  time_t ct;
93  uint32_t timecode;
94  va_list ap;
95  int audio_type = 0;
96  int channel;
97 
98  buf[0] = (uint8_t)pack_id;
99  switch (pack_id) {
100  case dv_timecode:
101  timecode = av_timecode_get_smpte_from_framenum(&c->tc, c->frames);
102  timecode |= 1<<23 | 1<<15 | 1<<7 | 1<<6; // biphase and binary group flags
103  AV_WB32(buf + 1, timecode);
104  break;
105  case dv_audio_source: /* AAUX source pack */
106  va_start(ap, buf);
107  channel = va_arg(ap, int);
108  if (c->ast[channel]->codecpar->sample_rate == 44100) {
109  audio_type = 1;
110  } else if (c->ast[channel]->codecpar->sample_rate == 32000)
111  audio_type = 2;
112  buf[1] = (1 << 7) | /* locked mode -- SMPTE only supports locked mode */
113  (1 << 6) | /* reserved -- always 1 */
114  (dv_audio_frame_size(c->sys, c->frames, c->ast[channel]->codecpar->sample_rate) -
115  c->sys->audio_min_samples[audio_type]);
116  /* # of samples */
117  buf[2] = (0 << 7) | /* multi-stereo */
118  (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */
119  (0 << 4) | /* pair bit: 0 -- one pair of channels */
120  !!va_arg(ap, int); /* audio mode */
121  buf[3] = (1 << 7) | /* res */
122  (1 << 6) | /* multi-language flag */
123  (c->sys->dsf << 5) | /* system: 60fields/50fields */
124  (c->sys->n_difchan & 2); /* definition: 0 -- 25Mbps, 2 -- 50Mbps */
125  buf[4] = (1 << 7) | /* emphasis: 1 -- off */
126  (0 << 6) | /* emphasis time constant: 0 -- reserved */
127  (audio_type << 3) | /* frequency: 0 -- 48kHz, 1 -- 44,1kHz, 2 -- 32kHz */
128  0; /* quantization: 0 -- 16-bit linear, 1 -- 12-bit nonlinear */
129 
130  va_end(ap);
131  break;
132  case dv_audio_control:
133  buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */
134  (1 << 4) | /* input source: 1 -- digital input */
135  (3 << 2) | /* compression: 3 -- no information */
136  0; /* misc. info/SMPTE emphasis off */
137  buf[2] = (1 << 7) | /* recording start point: 1 -- no */
138  (1 << 6) | /* recording end point: 1 -- no */
139  (1 << 3) | /* recording mode: 1 -- original */
140  7;
141  buf[3] = (1 << 7) | /* direction: 1 -- forward */
142  (c->sys->pix_fmt == AV_PIX_FMT_YUV420P ? 0x20 : /* speed */
143  c->sys->ltc_divisor * 4);
144  buf[4] = (1 << 7) | /* reserved -- always 1 */
145  0x7f; /* genre category */
146  break;
147  case dv_audio_recdate:
148  case dv_video_recdate: /* VAUX recording date */
149  ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num,
151  ff_brktimegm(ct, &tc);
152  buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */
153  /* 0xff is very likely to be "unknown" */
154  buf[2] = (3 << 6) | /* reserved -- always 1 */
155  ((tc.tm_mday / 10) << 4) | /* Tens of day */
156  (tc.tm_mday % 10); /* Units of day */
157  buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */
158  ((tc.tm_mon / 10) << 4) | /* Tens of month */
159  (tc.tm_mon % 10); /* Units of month */
160  buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */
161  (tc.tm_year % 10); /* Units of year */
162  break;
163  case dv_audio_rectime: /* AAUX recording time */
164  case dv_video_rectime: /* VAUX recording time */
165  ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num,
167  ff_brktimegm(ct, &tc);
168  buf[1] = (3 << 6) | /* reserved -- always 1 */
169  0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */
170  buf[2] = (1 << 7) | /* reserved -- always 1 */
171  ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
172  (tc.tm_sec % 10); /* Units of seconds */
173  buf[3] = (1 << 7) | /* reserved -- always 1 */
174  ((tc.tm_min / 10) << 4) | /* Tens of minutes */
175  (tc.tm_min % 10); /* Units of minutes */
176  buf[4] = (3 << 6) | /* reserved -- always 1 */
177  ((tc.tm_hour / 10) << 4) | /* Tens of hours */
178  (tc.tm_hour % 10); /* Units of hours */
179  break;
180  default:
181  buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
182  }
183  return 5;
184 }
185 
186 static void dv_inject_audio(DVMuxContext *c, int channel, uint8_t* frame_ptr)
187 {
188  int i, j, d, of, size;
189  size = 4 * dv_audio_frame_size(c->sys, c->frames, c->ast[channel]->codecpar->sample_rate);
190  frame_ptr += channel * c->sys->difseg_size * 150 * 80;
191  for (i = 0; i < c->sys->difseg_size; i++) {
192  frame_ptr += 6 * 80; /* skip DIF segment header */
193  for (j = 0; j < 9; j++) {
194  dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3], channel, i >= c->sys->difseg_size/2);
195  for (d = 8; d < 80; d+=2) {
196  of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride;
197  if (of*2 >= size)
198  continue;
199 
200  frame_ptr[d] = *av_fifo_peek2(c->audio_data[channel], of*2+1); // FIXME: maybe we have to admit
201  frame_ptr[d+1] = *av_fifo_peek2(c->audio_data[channel], of*2); // that DV is a big-endian PCM
202  }
203  frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
204  }
205  }
206 }
207 
209 {
210  int j, k;
211  uint8_t* buf;
212 
213  for (buf = frame; buf < frame + c->sys->frame_size; buf += 150 * 80) {
214  /* DV subcode: 2nd and 3d DIFs */
215  for (j = 80; j < 80 * 3; j += 80) {
216  for (k = 6; k < 6 * 8; k += 8)
217  dv_write_pack(dv_timecode, c, &buf[j+k]);
218 
219  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 ? */
220  dv_write_pack(dv_video_recdate, c, &buf[j+14]);
221  dv_write_pack(dv_video_rectime, c, &buf[j+22]);
222  dv_write_pack(dv_video_recdate, c, &buf[j+38]);
223  dv_write_pack(dv_video_rectime, c, &buf[j+46]);
224  }
225  }
226 
227  /* DV VAUX: 4th, 5th and 6th 3DIFs */
228  for (j = 80*3 + 3; j < 80*6; j += 80) {
229  dv_write_pack(dv_video_recdate, c, &buf[j+5*2]);
230  dv_write_pack(dv_video_rectime, c, &buf[j+5*3]);
231  dv_write_pack(dv_video_recdate, c, &buf[j+5*11]);
232  dv_write_pack(dv_video_rectime, c, &buf[j+5*12]);
233  }
234  }
235 }
236 
237 /*
238  * The following 3 functions constitute our interface to the world
239  */
240 
242  DVMuxContext *c, AVStream* st,
243  uint8_t* data, int data_size, uint8_t** frame)
244 {
245  int i, reqasize;
246 
247  *frame = &c->frame_buf[0];
248 
249  switch (st->codecpar->codec_type) {
250  case AVMEDIA_TYPE_VIDEO:
251  /* FIXME: we have to have more sensible approach than this one */
252  if (c->has_video)
253  av_log(s, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);
254  if (data_size != c->sys->frame_size) {
255  av_log(s, AV_LOG_ERROR, "Unexpected frame size, %d != %d\n",
256  data_size, c->sys->frame_size);
257  return AVERROR(ENOSYS);
258  }
259 
260  memcpy(*frame, data, c->sys->frame_size);
261  c->has_video = 1;
262  break;
263  case AVMEDIA_TYPE_AUDIO:
264  for (i = 0; i < c->n_ast && st != c->ast[i]; i++);
265 
266  /* FIXME: we have to have more sensible approach than this one */
267  if (av_fifo_size(c->audio_data[i]) + data_size >= 100*MAX_AUDIO_FRAME_SIZE)
268  av_log(s, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);
269  av_fifo_generic_write(c->audio_data[i], data, data_size, NULL);
270 
271  reqasize = 4 * dv_audio_frame_size(c->sys, c->frames, st->codecpar->sample_rate);
272 
273  /* Let us see if we've got enough audio for one DV frame. */
274  c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i);
275 
276  break;
277  default:
278  break;
279  }
280 
281  /* Let us see if we have enough data to construct one DV frame. */
282  if (c->has_video == 1 && c->has_audio + 1 == 1 << c->n_ast) {
283  dv_inject_metadata(c, *frame);
284  c->has_audio = 0;
285  for (i=0; i < c->n_ast; i++) {
286  dv_inject_audio(c, i, *frame);
287  reqasize = 4 * dv_audio_frame_size(c->sys, c->frames, c->ast[i]->codecpar->sample_rate);
288  av_fifo_drain(c->audio_data[i], reqasize);
289  c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i);
290  }
291 
292  c->has_video = 0;
293 
294  c->frames++;
295 
296  return c->sys->frame_size;
297  }
298 
299  return 0;
300 }
301 
303 {
304  DVMuxContext *c = s->priv_data;
305  AVStream *vst = NULL;
306  int i;
307 
308  /* we support at most 1 video and 2 audio streams */
309  if (s->nb_streams > 3)
310  return NULL;
311 
312  c->n_ast = 0;
313  c->ast[0] = c->ast[1] = NULL;
314 
315  /* We have to sort out where audio and where video stream is */
316  for (i=0; i<s->nb_streams; i++) {
317  switch (s->streams[i]->codecpar->codec_type) {
318  case AVMEDIA_TYPE_VIDEO:
319  if (vst) return NULL;
320  vst = s->streams[i];
321  break;
322  case AVMEDIA_TYPE_AUDIO:
323  if (c->n_ast > 1) return NULL;
324  c->ast[c->n_ast++] = s->streams[i];
325  break;
326  default:
327  goto bail_out;
328  }
329  }
330 
331  /* Some checks -- DV format is very picky about its incoming streams */
332  if (!vst || vst->codecpar->codec_id != AV_CODEC_ID_DVVIDEO)
333  goto bail_out;
334  for (i=0; i<c->n_ast; i++) {
335  if (c->ast[i]) {
336  if(c->ast[i]->codecpar->codec_id != AV_CODEC_ID_PCM_S16LE ||
337  c->ast[i]->codecpar->channels != 2)
338  goto bail_out;
339  if (c->ast[i]->codecpar->sample_rate != 48000 &&
340  c->ast[i]->codecpar->sample_rate != 44100 &&
341  c->ast[i]->codecpar->sample_rate != 32000 )
342  goto bail_out;
343  }
344  }
346  vst->codecpar->format, vst->time_base);
347  if (!c->sys)
348  goto bail_out;
349 
350  if ((c->sys->time_base.den != 25 && c->sys->time_base.den != 50) || c->sys->time_base.num != 1) {
351  if (c->ast[0] && c->ast[0]->codecpar->sample_rate != 48000)
352  goto bail_out;
353  if (c->ast[1] && c->ast[1]->codecpar->sample_rate != 48000)
354  goto bail_out;
355  }
356 
357  if ((c->n_ast > 1) && (c->sys->n_difchan < 2)) {
358  /* only 1 stereo pair is allowed in 25Mbps mode */
359  goto bail_out;
360  }
361 
362  /* Ok, everything seems to be in working order */
363  c->frames = 0;
364  c->has_audio = 0;
365  c->has_video = 0;
367 
368  for (i=0; i < c->n_ast; i++) {
369  if (c->ast[i] && !(c->audio_data[i]=av_fifo_alloc_array(100, MAX_AUDIO_FRAME_SIZE))) {
370  while (i > 0) {
371  i--;
372  av_fifo_freep(&c->audio_data[i]);
373  }
374  goto bail_out;
375  }
376  }
377 
378  return c;
379 
380 bail_out:
381  return NULL;
382 }
383 
385 {
386  int i;
387  for (i=0; i < c->n_ast; i++)
388  av_fifo_freep(&c->audio_data[i]);
389 }
390 
392 {
393  AVRational rate;
394  DVMuxContext *dvc = s->priv_data;
395  AVDictionaryEntry *tcr = av_dict_get(s->metadata, "timecode", NULL, 0);
396 
397  if (!dv_init_mux(s)) {
398  av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n"
399  "Make sure that you supply exactly two streams:\n"
400  " video: 25fps or 29.97fps, audio: 2ch/48|44|32kHz/PCM\n"
401  " (50Mbps allows an optional second audio stream)\n");
402  return -1;
403  }
404  rate.num = dvc->sys->ltc_divisor;
405  rate.den = 1;
406  if (!tcr) { // no global timecode, look into the streams
407  int i;
408  for (i = 0; i < s->nb_streams; i++) {
409  tcr = av_dict_get(s->streams[i]->metadata, "timecode", NULL, 0);
410  if (tcr)
411  break;
412  }
413  }
414  if (tcr && av_timecode_init_from_string(&dvc->tc, rate, tcr->value, s) >= 0)
415  return 0;
416  return av_timecode_init(&dvc->tc, rate, 0, 0, s);
417 }
418 
420 {
421  uint8_t* frame;
422  int fsize;
423 
424  fsize = dv_assemble_frame(s, s->priv_data, s->streams[pkt->stream_index],
425  pkt->data, pkt->size, &frame);
426  if (fsize > 0) {
427  avio_write(s->pb, frame, fsize);
428  }
429  return 0;
430 }
431 
432 /*
433  * We might end up with some extra A/V data without matching counterpart.
434  * E.g. video data without enough audio to write the complete frame.
435  * Currently we simply drop the last frame. I don't know whether this
436  * is the best strategy of all
437  */
438 static int dv_write_trailer(struct AVFormatContext *s)
439 {
441  return 0;
442 }
443 
445  .name = "dv",
446  .long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
447  .extensions = "dv",
448  .priv_data_size = sizeof(DVMuxContext),
449  .audio_codec = AV_CODEC_ID_PCM_S16LE,
450  .video_codec = AV_CODEC_ID_DVVIDEO,
454 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
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
int ltc_divisor
Definition: dv_profile.h:46
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3922
int num
numerator
Definition: rational.h:44
int size
Definition: avcodec.h:1581
AVTimecode tc
Definition: dvenc.c:57
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:1325
int64_t start_time
Definition: dvenc.c:53
#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:193
dv_pack_type
Definition: dv.h:64
uint8_t
#define MAX_AUDIO_FRAME_SIZE
Definition: dvenc.c:44
int width
Video only.
Definition: avcodec.h:3988
AVFifoBuffer * audio_data[2]
Definition: dvenc.c:51
const AVDVProfile * sys
Definition: dvenc.c:48
AVOptions.
AVStream * ast[2]
Definition: dvenc.c:50
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1393
static AVFrame * frame
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:39
static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t *buf,...)
Definition: dvenc.c:89
int difseg_size
Definition: dv_profile.h:43
uint8_t * data
Definition: avcodec.h:1580
static void dv_inject_metadata(DVMuxContext *c, uint8_t *frame)
Definition: dvenc.c:208
enum AVPixelFormat pix_fmt
Definition: dv_profile.h:50
ptrdiff_t size
Definition: opengl_enc.c:101
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:204
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:183
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:5113
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:1539
static void dv_inject_audio(DVMuxContext *c, int channel, uint8_t *frame_ptr)
Definition: dvenc.c:186
#define AVERROR(e)
Definition: error.h:43
static int dv_audio_frame_size(const AVDVProfile *sys, int frame, int sample_rate)
Definition: dvenc.c:75
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
int frame_size
Definition: dv_profile.h:42
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3918
AVClass * av_class
Definition: dvenc.c:47
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1381
struct tm * ff_brktimegm(time_t secs, struct tm *tm)
Definition: cutils.c:31
int n_ast
Definition: dvenc.c:49
static int dv_write_header(AVFormatContext *s)
Definition: dvenc.c:391
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:94
const char * name
Definition: avformat.h:522
AVDictionary * metadata
Definition: avformat.h:945
int has_video
Definition: dvenc.c:55
Stream structure.
Definition: avformat.h:876
sample_rate
int has_audio
Definition: dvenc.c:54
Definition: dv.h:67
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:1367
#define DV_MAX_FRAME_SIZE
largest possible DV frame, in bytes (1080i50)
Definition: dv.h:86
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:241
static int dv_write_trailer(struct AVFormatContext *s)
Definition: dvenc.c:438
void * buf
Definition: avisynth_c.h:553
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 numerator/denominator
Definition: rational.h:43
static const int dv_aaux_packs_dist[12][9]
Definition: dvenc.c:60
Round toward -infinity.
Definition: mathematics.h:73
static DVMuxContext * dv_init_mux(AVFormatContext *s)
Definition: dvenc.c:302
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:56
int sample_rate
Audio only.
Definition: avcodec.h:4032
Main libavformat public API header.
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:62
if(ret< 0)
Definition: vf_mcdeint.c:282
static double c[64]
Constants for DV codec.
int den
denominator
Definition: rational.h:45
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:1353
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:498
int frames
Definition: dvenc.c:52
AVOutputFormat ff_dv_muxer
Definition: dvenc.c:444
int channels
Audio only.
Definition: avcodec.h:4028
void av_fifo_freep(AVFifoBuffer **f)
Free an AVFifoBuffer and reset pointer to NULL.
Definition: fifo.c:63
AVCodecParameters * codecpar
Definition: avformat.h:1006
static int64_t fsize(FILE *f)
Definition: audiomatch.c:28
int n_difchan
Definition: dv_profile.h:44
int stream_index
Definition: avcodec.h:1582
static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt)
Definition: dvenc.c:419
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:913
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:1557
static int write_packet(AVFormatContext *s1, AVPacket *pkt)
Definition: v4l2enc.c:86
static void dv_delete_mux(DVMuxContext *c)
Definition: dvenc.c:384
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