FFmpeg
avcodec.c
Go to the documentation of this file.
1 /*
2  * AVCodecContext functions for libavcodec
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * AVCodecContext functions for libavcodec
24  */
25 
26 #include "config.h"
27 #include "libavutil/avassert.h"
28 #include "libavutil/avstring.h"
29 #include "libavutil/bprint.h"
30 #include "libavutil/channel_layout.h"
31 #include "libavutil/fifo.h"
32 #include "libavutil/imgutils.h"
33 #include "libavutil/mem.h"
34 #include "libavutil/opt.h"
35 #include "libavutil/thread.h"
36 #include "avcodec.h"
37 #include "bsf.h"
38 #include "codec_internal.h"
39 #include "decode.h"
40 #include "encode.h"
41 #include "frame_thread_encoder.h"
42 #include "internal.h"
43 #include "thread.h"
44 
45 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2), void *arg, int *ret, int count, int size)
46 {
47  int i;
48 
49  for (i = 0; i < count; i++) {
50  int r = func(c, (char *)arg + i * size);
51  if (ret)
52  ret[i] = r;
53  }
54  emms_c();
55  return 0;
56 }
57 
58 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int jobnr, int threadnr), void *arg, int *ret, int count)
59 {
60  int i;
61 
62  for (i = 0; i < count; i++) {
63  int r = func(c, arg, i, 0);
64  if (ret)
65  ret[i] = r;
66  }
67  emms_c();
68  return 0;
69 }
70 
71 static AVMutex codec_mutex = AV_MUTEX_INITIALIZER;
72 
73 static void lock_avcodec(const FFCodec *codec)
74 {
75  if (codec->caps_internal & FF_CODEC_CAP_NOT_INIT_THREADSAFE && codec->init)
76  ff_mutex_lock(&codec_mutex);
77 }
78 
79 static void unlock_avcodec(const FFCodec *codec)
80 {
81  if (codec->caps_internal & FF_CODEC_CAP_NOT_INIT_THREADSAFE && codec->init)
82  ff_mutex_unlock(&codec_mutex);
83 }
84 
85 static int64_t get_bit_rate(AVCodecContext *ctx)
86 {
87  int64_t bit_rate;
88  int bits_per_sample;
89 
90  switch (ctx->codec_type) {
91  case AVMEDIA_TYPE_VIDEO:
92  case AVMEDIA_TYPE_DATA:
93  case AVMEDIA_TYPE_SUBTITLE:
94  case AVMEDIA_TYPE_ATTACHMENT:
95  bit_rate = ctx->bit_rate;
96  break;
97  case AVMEDIA_TYPE_AUDIO:
98  bits_per_sample = av_get_bits_per_sample(ctx->codec_id);
99  if (bits_per_sample) {
100  bit_rate = ctx->sample_rate * (int64_t)ctx->ch_layout.nb_channels;
101  if (bit_rate > INT64_MAX / bits_per_sample) {
102  bit_rate = 0;
103  } else
104  bit_rate *= bits_per_sample;
105  } else
106  bit_rate = ctx->bit_rate;
107  break;
108  default:
109  bit_rate = 0;
110  break;
111  }
112  return bit_rate;
113 }
114 
115 int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
116 {
117  int ret = 0;
118  AVCodecInternal *avci;
119  const FFCodec *codec2;
120 
121  if (avcodec_is_open(avctx))
122  return 0;
123 
124  if (!codec && !avctx->codec) {
125  av_log(avctx, AV_LOG_ERROR, "No codec provided to avcodec_open2()\n");
126  return AVERROR(EINVAL);
127  }
128  if (codec && avctx->codec && codec != avctx->codec) {
129  av_log(avctx, AV_LOG_ERROR, "This AVCodecContext was allocated for %s, "
130  "but %s passed to avcodec_open2()\n", avctx->codec->name, codec->name);
131  return AVERROR(EINVAL);
132  }
133  if (!codec)
134  codec = avctx->codec;
135  codec2 = ffcodec(codec);
136 
137  if ((avctx->codec_type != AVMEDIA_TYPE_UNKNOWN && avctx->codec_type != codec->type) ||
138  (avctx->codec_id != AV_CODEC_ID_NONE && avctx->codec_id != codec->id)) {
139  av_log(avctx, AV_LOG_ERROR, "Codec type or id mismatches\n");
140  return AVERROR(EINVAL);
141  }
142 
143  avctx->codec_type = codec->type;
144  avctx->codec_id = codec->id;
145  avctx->codec = codec;
146 
147  if (avctx->extradata_size < 0 || avctx->extradata_size >= FF_MAX_EXTRADATA_SIZE)
148  return AVERROR(EINVAL);
149 
150  avci = av_mallocz(sizeof(*avci));
151  if (!avci) {
152  ret = AVERROR(ENOMEM);
153  goto end;
154  }
155  avctx->internal = avci;
156 
157  avci->buffer_frame = av_frame_alloc();
158  avci->buffer_pkt = av_packet_alloc();
159  if (!avci->buffer_frame || !avci->buffer_pkt) {
160  ret = AVERROR(ENOMEM);
161  goto free_and_end;
162  }
163 
164  if (codec2->priv_data_size > 0) {
165  if (!avctx->priv_data) {
166  avctx->priv_data = av_mallocz(codec2->priv_data_size);
167  if (!avctx->priv_data) {
168  ret = AVERROR(ENOMEM);
169  goto free_and_end;
170  }
171  if (codec->priv_class) {
172  *(const AVClass **)avctx->priv_data = codec->priv_class;
173  av_opt_set_defaults(avctx->priv_data);
174  }
175  }
176  if (codec->priv_class && (ret = av_opt_set_dict(avctx->priv_data, options)) < 0)
177  goto free_and_end;
178  } else {
179  avctx->priv_data = NULL;
180  }
181  if ((ret = av_opt_set_dict(avctx, options)) < 0)
182  goto free_and_end;
183 
184  if (avctx->codec_whitelist && av_match_list(codec->name, avctx->codec_whitelist, ',') <= 0) {
185  av_log(avctx, AV_LOG_ERROR, "Codec (%s) not on whitelist \'%s\'\n", codec->name, avctx->codec_whitelist);
186  ret = AVERROR(EINVAL);
187  goto free_and_end;
188  }
189 
190  // only call ff_set_dimensions() for non H.264/VP6F/DXV codecs so as not to overwrite previously setup dimensions
191  if (!(avctx->coded_width && avctx->coded_height && avctx->width && avctx->height &&
192  (avctx->codec_id == AV_CODEC_ID_H264 || avctx->codec_id == AV_CODEC_ID_VP6F || avctx->codec_id == AV_CODEC_ID_DXV))) {
193  if (avctx->coded_width && avctx->coded_height)
194  ret = ff_set_dimensions(avctx, avctx->coded_width, avctx->coded_height);
195  else if (avctx->width && avctx->height)
196  ret = ff_set_dimensions(avctx, avctx->width, avctx->height);
197  if (ret < 0)
198  goto free_and_end;
199  }
200 
201  if ((avctx->coded_width || avctx->coded_height || avctx->width || avctx->height)
202  && ( av_image_check_size2(avctx->coded_width, avctx->coded_height, avctx->max_pixels, AV_PIX_FMT_NONE, 0, avctx) < 0
203  || av_image_check_size2(avctx->width, avctx->height, avctx->max_pixels, AV_PIX_FMT_NONE, 0, avctx) < 0)) {
204  av_log(avctx, AV_LOG_WARNING, "Ignoring invalid width/height values\n");
205  ff_set_dimensions(avctx, 0, 0);
206  }
207 
208  if (avctx->width > 0 && avctx->height > 0) {
209  if (av_image_check_sar(avctx->width, avctx->height,
210  avctx->sample_aspect_ratio) < 0) {
211  av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
212  avctx->sample_aspect_ratio.num,
213  avctx->sample_aspect_ratio.den);
214  avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
215  }
216  }
217 
218  if (avctx->sample_rate < 0) {
219  av_log(avctx, AV_LOG_ERROR, "Invalid sample rate: %d\n", avctx->sample_rate);
220  ret = AVERROR(EINVAL);
221  goto free_and_end;
222  }
223  if (avctx->block_align < 0) {
224  av_log(avctx, AV_LOG_ERROR, "Invalid block align: %d\n", avctx->block_align);
225  ret = AVERROR(EINVAL);
226  goto free_and_end;
227  }
228 
229 #if FF_API_OLD_CHANNEL_LAYOUT
230 FF_DISABLE_DEPRECATION_WARNINGS
231  /* compat wrapper for old-style callers */
232  if (avctx->channel_layout && !avctx->channels)
233  avctx->channels = av_popcount64(avctx->channel_layout);
234 
235  if ((avctx->channels && avctx->ch_layout.nb_channels != avctx->channels) ||
236  (avctx->channel_layout && (avctx->ch_layout.order != AV_CHANNEL_ORDER_NATIVE ||
237  avctx->ch_layout.u.mask != avctx->channel_layout))) {
238  av_channel_layout_uninit(&avctx->ch_layout);
239  if (avctx->channel_layout) {
240  av_channel_layout_from_mask(&avctx->ch_layout, avctx->channel_layout);
241  } else {
242  avctx->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
243  }
244  avctx->ch_layout.nb_channels = avctx->channels;
245  }
246 FF_ENABLE_DEPRECATION_WARNINGS
247 #endif
248 
249  /* AV_CODEC_CAP_CHANNEL_CONF is a decoder-only flag; so the code below
250  * in particular checks that nb_channels is set for all audio encoders. */
251  if (avctx->codec_type == AVMEDIA_TYPE_AUDIO && !avctx->ch_layout.nb_channels
252  && !(codec->capabilities & AV_CODEC_CAP_CHANNEL_CONF)) {
253  av_log(avctx, AV_LOG_ERROR, "%s requires channel layout to be set\n",
254  av_codec_is_decoder(codec) ? "Decoder" : "Encoder");
255  ret = AVERROR(EINVAL);
256  goto free_and_end;
257  }
258  if (avctx->ch_layout.nb_channels && !av_channel_layout_check(&avctx->ch_layout)) {
259  av_log(avctx, AV_LOG_ERROR, "Invalid channel layout\n");
260  ret = AVERROR(EINVAL);
261  goto free_and_end;
262  }
263  if (avctx->ch_layout.nb_channels > FF_SANE_NB_CHANNELS) {
264  av_log(avctx, AV_LOG_ERROR, "Too many channels: %d\n", avctx->ch_layout.nb_channels);
265  ret = AVERROR(EINVAL);
266  goto free_and_end;
267  }
268 
269  avctx->frame_num = 0;
270 #if FF_API_AVCTX_FRAME_NUMBER
271 FF_DISABLE_DEPRECATION_WARNINGS
272  avctx->frame_number = avctx->frame_num;
273 FF_ENABLE_DEPRECATION_WARNINGS
274 #endif
275  avctx->codec_descriptor = avcodec_descriptor_get(avctx->codec_id);
276 
277  if ((avctx->codec->capabilities & AV_CODEC_CAP_EXPERIMENTAL) &&
278  avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
279  const char *codec_string = av_codec_is_encoder(codec) ? "encoder" : "decoder";
280  const AVCodec *codec2;
281  av_log(avctx, AV_LOG_ERROR,
282  "The %s '%s' is experimental but experimental codecs are not enabled, "
283  "add '-strict %d' if you want to use it.\n",
284  codec_string, codec->name, FF_COMPLIANCE_EXPERIMENTAL);
285  codec2 = av_codec_is_encoder(codec) ? avcodec_find_encoder(codec->id) : avcodec_find_decoder(codec->id);
286  if (!(codec2->capabilities & AV_CODEC_CAP_EXPERIMENTAL))
287  av_log(avctx, AV_LOG_ERROR, "Alternatively use the non experimental %s '%s'.\n",
288  codec_string, codec2->name);
289  ret = AVERROR_EXPERIMENTAL;
290  goto free_and_end;
291  }
292 
293  if (avctx->codec_type == AVMEDIA_TYPE_AUDIO &&
294  (!avctx->time_base.num || !avctx->time_base.den)) {
295  avctx->time_base.num = 1;
296  avctx->time_base.den = avctx->sample_rate;
297  }
298 
299  if (av_codec_is_encoder(avctx->codec))
300  ret = ff_encode_preinit(avctx);
301  else
302  ret = ff_decode_preinit(avctx);
303  if (ret < 0)
304  goto free_and_end;
305 
306  if (HAVE_THREADS && !avci->frame_thread_encoder) {
307  /* Frame-threaded decoders call FFCodec.init for their child contexts. */
308  lock_avcodec(codec2);
309  ret = ff_thread_init(avctx);
310  unlock_avcodec(codec2);
311  if (ret < 0) {
312  goto free_and_end;
313  }
314  }
315  if (!HAVE_THREADS && !(codec2->caps_internal & FF_CODEC_CAP_AUTO_THREADS))
316  avctx->thread_count = 1;
317 
318  if (!(avctx->active_thread_type & FF_THREAD_FRAME) ||
319  avci->frame_thread_encoder) {
320  if (codec2->init) {
321  lock_avcodec(codec2);
322  ret = codec2->init(avctx);
323  unlock_avcodec(codec2);
324  if (ret < 0) {
325  avci->needs_close = codec2->caps_internal & FF_CODEC_CAP_INIT_CLEANUP;
326  goto free_and_end;
327  }
328  }
329  avci->needs_close = 1;
330  }
331 
332  ret=0;
333 
334  if (av_codec_is_decoder(avctx->codec)) {
335  if (!avctx->bit_rate)
336  avctx->bit_rate = get_bit_rate(avctx);
337 
338 #if FF_API_OLD_CHANNEL_LAYOUT
339 FF_DISABLE_DEPRECATION_WARNINGS
340  /* update the deprecated fields for old-style callers */
341  avctx->channels = avctx->ch_layout.nb_channels;
342  avctx->channel_layout = avctx->ch_layout.order == AV_CHANNEL_ORDER_NATIVE ?
343  avctx->ch_layout.u.mask : 0;
344 FF_ENABLE_DEPRECATION_WARNINGS
345 #endif
346 
347  /* validate channel layout from the decoder */
348  if ((avctx->ch_layout.nb_channels && !av_channel_layout_check(&avctx->ch_layout)) ||
349  avctx->ch_layout.nb_channels > FF_SANE_NB_CHANNELS) {
350  ret = AVERROR(EINVAL);
351  goto free_and_end;
352  }
353  if (avctx->bits_per_coded_sample < 0) {
354  ret = AVERROR(EINVAL);
355  goto free_and_end;
356  }
357  }
358  if (codec->priv_class)
359  av_assert0(*(const AVClass **)avctx->priv_data == codec->priv_class);
360 
361 end:
362 
363  return ret;
364 free_and_end:
365  avcodec_close(avctx);
366  goto end;
367 }
368 
369 void avcodec_flush_buffers(AVCodecContext *avctx)
370 {
371  AVCodecInternal *avci = avctx->internal;
372 
373  if (av_codec_is_encoder(avctx->codec)) {
374  int caps = avctx->codec->capabilities;
375 
376  if (!(caps & AV_CODEC_CAP_ENCODER_FLUSH)) {
377  // Only encoders that explicitly declare support for it can be
378  // flushed. Otherwise, this is a no-op.
379  av_log(avctx, AV_LOG_WARNING, "Ignoring attempt to flush encoder "
380  "that doesn't support it\n");
381  return;
382  }
383  if (avci->in_frame)
384  av_frame_unref(avci->in_frame);
385  if (avci->recon_frame)
386  av_frame_unref(avci->recon_frame);
387  } else {
388  av_packet_unref(avci->last_pkt_props);
389  av_packet_unref(avci->in_pkt);
390 
391  avctx->pts_correction_last_pts =
392  avctx->pts_correction_last_dts = INT64_MIN;
393 
394  av_bsf_flush(avci->bsf);
395  }
396 
397  avci->draining = 0;
398  avci->draining_done = 0;
399  avci->nb_draining_errors = 0;
400  av_frame_unref(avci->buffer_frame);
401  av_packet_unref(avci->buffer_pkt);
402 
403  if (HAVE_THREADS && avctx->active_thread_type & FF_THREAD_FRAME)
404  ff_thread_flush(avctx);
405  else if (ffcodec(avctx->codec)->flush)
406  ffcodec(avctx->codec)->flush(avctx);
407 }
408 
409 void avsubtitle_free(AVSubtitle *sub)
410 {
411  int i;
412 
413  for (i = 0; i < sub->num_rects; i++) {
414  AVSubtitleRect *const rect = sub->rects[i];
415 
416  av_freep(&rect->data[0]);
417  av_freep(&rect->data[1]);
418  av_freep(&rect->data[2]);
419  av_freep(&rect->data[3]);
420  av_freep(&rect->text);
421  av_freep(&rect->ass);
422 
423  av_freep(&sub->rects[i]);
424  }
425 
426  av_freep(&sub->rects);
427 
428  memset(sub, 0, sizeof(*sub));
429 }
430 
431 av_cold int avcodec_close(AVCodecContext *avctx)
432 {
433  int i;
434 
435  if (!avctx)
436  return 0;
437 
438  if (avcodec_is_open(avctx)) {
439  AVCodecInternal *avci = avctx->internal;
440 
441  if (CONFIG_FRAME_THREAD_ENCODER &&
442  avci->frame_thread_encoder && avctx->thread_count > 1) {
443  ff_frame_thread_encoder_free(avctx);
444  }
445  if (HAVE_THREADS && avci->thread_ctx)
446  ff_thread_free(avctx);
447  if (avci->needs_close && ffcodec(avctx->codec)->close)
448  ffcodec(avctx->codec)->close(avctx);
449  avci->byte_buffer_size = 0;
450  av_freep(&avci->byte_buffer);
451  av_frame_free(&avci->buffer_frame);
452  av_packet_free(&avci->buffer_pkt);
453  av_packet_free(&avci->last_pkt_props);
454 
455  av_packet_free(&avci->in_pkt);
456  av_frame_free(&avci->in_frame);
457  av_frame_free(&avci->recon_frame);
458 
459  av_buffer_unref(&avci->pool);
460 
461  if (avctx->hwaccel && avctx->hwaccel->uninit)
462  avctx->hwaccel->uninit(avctx);
463  av_freep(&avci->hwaccel_priv_data);
464 
465  av_bsf_free(&avci->bsf);
466 
467  av_channel_layout_uninit(&avci->initial_ch_layout);
468 
469 #if CONFIG_LCMS2
470  ff_icc_context_uninit(&avci->icc);
471 #endif
472 
473  av_freep(&avctx->internal);
474  }
475 
476  for (i = 0; i < avctx->nb_coded_side_data; i++)
477  av_freep(&avctx->coded_side_data[i].data);
478  av_freep(&avctx->coded_side_data);
479  avctx->nb_coded_side_data = 0;
480 
481  av_buffer_unref(&avctx->hw_frames_ctx);
482  av_buffer_unref(&avctx->hw_device_ctx);
483 
484  if (avctx->priv_data && avctx->codec && avctx->codec->priv_class)
485  av_opt_free(avctx->priv_data);
486  av_opt_free(avctx);
487  av_freep(&avctx->priv_data);
488  if (av_codec_is_encoder(avctx->codec)) {
489  av_freep(&avctx->extradata);
490  avctx->extradata_size = 0;
491  } else if (av_codec_is_decoder(avctx->codec))
492  av_freep(&avctx->subtitle_header);
493 
494  avctx->codec = NULL;
495  avctx->active_thread_type = 0;
496 
497  return 0;
498 }
499 
500 static const char *unknown_if_null(const char *str)
501 {
502  return str ? str : "unknown";
503 }
504 
505 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
506 {
507  const char *codec_type;
508  const char *codec_name;
509  const char *profile = NULL;
510  AVBPrint bprint;
511  int64_t bitrate;
512  int new_line = 0;
513  AVRational display_aspect_ratio;
514  const char *separator = enc->dump_separator ? (const char *)enc->dump_separator : ", ";
515  const char *str;
516 
517  if (!buf || buf_size <= 0)
518  return;
519  av_bprint_init_for_buffer(&bprint, buf, buf_size);
520  codec_type = av_get_media_type_string(enc->codec_type);
521  codec_name = avcodec_get_name(enc->codec_id);
522  profile = avcodec_profile_name(enc->codec_id, enc->profile);
523 
524  av_bprintf(&bprint, "%s: %s", codec_type ? codec_type : "unknown",
525  codec_name);
526  buf[0] ^= 'a' ^ 'A'; /* first letter in uppercase */
527 
528  if (enc->codec && strcmp(enc->codec->name, codec_name))
529  av_bprintf(&bprint, " (%s)", enc->codec->name);
530 
531  if (profile)
532  av_bprintf(&bprint, " (%s)", profile);
533  if ( enc->codec_type == AVMEDIA_TYPE_VIDEO
534  && av_log_get_level() >= AV_LOG_VERBOSE
535  && enc->refs)
536  av_bprintf(&bprint, ", %d reference frame%s",
537  enc->refs, enc->refs > 1 ? "s" : "");
538 
539  if (enc->codec_tag)
540  av_bprintf(&bprint, " (%s / 0x%04X)",
541  av_fourcc2str(enc->codec_tag), enc->codec_tag);
542 
543  switch (enc->codec_type) {
544  case AVMEDIA_TYPE_VIDEO:
545  {
546  unsigned len;
547 
548  av_bprintf(&bprint, "%s%s", separator,
549  enc->pix_fmt == AV_PIX_FMT_NONE ? "none" :
550  unknown_if_null(av_get_pix_fmt_name(enc->pix_fmt)));
551 
552  av_bprint_chars(&bprint, '(', 1);
553  len = bprint.len;
554 
555  /* The following check ensures that '(' has been written
556  * and therefore allows us to erase it if it turns out
557  * to be unnecessary. */
558  if (!av_bprint_is_complete(&bprint))
559  return;
560 
561  if (enc->bits_per_raw_sample && enc->pix_fmt != AV_PIX_FMT_NONE &&
562  enc->bits_per_raw_sample < av_pix_fmt_desc_get(enc->pix_fmt)->comp[0].depth)
563  av_bprintf(&bprint, "%d bpc, ", enc->bits_per_raw_sample);
564  if (enc->color_range != AVCOL_RANGE_UNSPECIFIED &&
565  (str = av_color_range_name(enc->color_range)))
566  av_bprintf(&bprint, "%s, ", str);
567 
568  if (enc->colorspace != AVCOL_SPC_UNSPECIFIED ||
569  enc->color_primaries != AVCOL_PRI_UNSPECIFIED ||
570  enc->color_trc != AVCOL_TRC_UNSPECIFIED) {
571  const char *col = unknown_if_null(av_color_space_name(enc->colorspace));
572  const char *pri = unknown_if_null(av_color_primaries_name(enc->color_primaries));
573  const char *trc = unknown_if_null(av_color_transfer_name(enc->color_trc));
574  if (strcmp(col, pri) || strcmp(col, trc)) {
575  new_line = 1;
576  av_bprintf(&bprint, "%s/%s/%s, ", col, pri, trc);
577  } else
578  av_bprintf(&bprint, "%s, ", col);
579  }
580 
581  if (enc->field_order != AV_FIELD_UNKNOWN) {
582  const char *field_order = "progressive";
583  if (enc->field_order == AV_FIELD_TT)
584  field_order = "top first";
585  else if (enc->field_order == AV_FIELD_BB)
586  field_order = "bottom first";
587  else if (enc->field_order == AV_FIELD_TB)
588  field_order = "top coded first (swapped)";
589  else if (enc->field_order == AV_FIELD_BT)
590  field_order = "bottom coded first (swapped)";
591 
592  av_bprintf(&bprint, "%s, ", field_order);
593  }
594 
595  if (av_log_get_level() >= AV_LOG_VERBOSE &&
596  enc->chroma_sample_location != AVCHROMA_LOC_UNSPECIFIED &&
597  (str = av_chroma_location_name(enc->chroma_sample_location)))
598  av_bprintf(&bprint, "%s, ", str);
599 
600  if (len == bprint.len) {
601  bprint.str[len - 1] = '\0';
602  bprint.len--;
603  } else {
604  if (bprint.len - 2 < bprint.size) {
605  /* Erase the last ", " */
606  bprint.len -= 2;
607  bprint.str[bprint.len] = '\0';
608  }
609  av_bprint_chars(&bprint, ')', 1);
610  }
611  }
612 
613  if (enc->width) {
614  av_bprintf(&bprint, "%s%dx%d", new_line ? separator : ", ",
615  enc->width, enc->height);
616 
617  if (av_log_get_level() >= AV_LOG_VERBOSE &&
618  (enc->width != enc->coded_width ||
619  enc->height != enc->coded_height))
620  av_bprintf(&bprint, " (%dx%d)",
621  enc->coded_width, enc->coded_height);
622 
623  if (enc->sample_aspect_ratio.num) {
624  av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den,
625  enc->width * (int64_t)enc->sample_aspect_ratio.num,
626  enc->height * (int64_t)enc->sample_aspect_ratio.den,
627  1024 * 1024);
628  av_bprintf(&bprint, " [SAR %d:%d DAR %d:%d]",
629  enc->sample_aspect_ratio.num, enc->sample_aspect_ratio.den,
630  display_aspect_ratio.num, display_aspect_ratio.den);
631  }
632  if (av_log_get_level() >= AV_LOG_DEBUG) {
633  int g = av_gcd(enc->time_base.num, enc->time_base.den);
634  av_bprintf(&bprint, ", %d/%d",
635  enc->time_base.num / g, enc->time_base.den / g);
636  }
637  }
638  if (encode) {
639  av_bprintf(&bprint, ", q=%d-%d", enc->qmin, enc->qmax);
640  } else {
641  if (enc->properties & FF_CODEC_PROPERTY_CLOSED_CAPTIONS)
642  av_bprintf(&bprint, ", Closed Captions");
643  if (enc->properties & FF_CODEC_PROPERTY_FILM_GRAIN)
644  av_bprintf(&bprint, ", Film Grain");
645  if (enc->properties & FF_CODEC_PROPERTY_LOSSLESS)
646  av_bprintf(&bprint, ", lossless");
647  }
648  break;
649  case AVMEDIA_TYPE_AUDIO:
650  av_bprintf(&bprint, "%s", separator);
651 
652  if (enc->sample_rate) {
653  av_bprintf(&bprint, "%d Hz, ", enc->sample_rate);
654  }
655  {
656  char buf[512];
657  int ret = av_channel_layout_describe(&enc->ch_layout, buf, sizeof(buf));
658  if (ret >= 0)
659  av_bprintf(&bprint, "%s", buf);
660  }
661  if (enc->sample_fmt != AV_SAMPLE_FMT_NONE &&
662  (str = av_get_sample_fmt_name(enc->sample_fmt))) {
663  av_bprintf(&bprint, ", %s", str);
664  }
665  if ( enc->bits_per_raw_sample > 0
666  && enc->bits_per_raw_sample != av_get_bytes_per_sample(enc->sample_fmt) * 8)
667  av_bprintf(&bprint, " (%d bit)", enc->bits_per_raw_sample);
668  if (av_log_get_level() >= AV_LOG_VERBOSE) {
669  if (enc->initial_padding)
670  av_bprintf(&bprint, ", delay %d", enc->initial_padding);
671  if (enc->trailing_padding)
672  av_bprintf(&bprint, ", padding %d", enc->trailing_padding);
673  }
674  break;
675  case AVMEDIA_TYPE_DATA:
676  if (av_log_get_level() >= AV_LOG_DEBUG) {
677  int g = av_gcd(enc->time_base.num, enc->time_base.den);
678  if (g)
679  av_bprintf(&bprint, ", %d/%d",
680  enc->time_base.num / g, enc->time_base.den / g);
681  }
682  break;
683  case AVMEDIA_TYPE_SUBTITLE:
684  if (enc->width)
685  av_bprintf(&bprint, ", %dx%d", enc->width, enc->height);
686  break;
687  default:
688  return;
689  }
690  if (encode) {
691  if (enc->flags & AV_CODEC_FLAG_PASS1)
692  av_bprintf(&bprint, ", pass 1");
693  if (enc->flags & AV_CODEC_FLAG_PASS2)
694  av_bprintf(&bprint, ", pass 2");
695  }
696  bitrate = get_bit_rate(enc);
697  if (bitrate != 0) {
698  av_bprintf(&bprint, ", %"PRId64" kb/s", bitrate / 1000);
699  } else if (enc->rc_max_rate > 0) {
700  av_bprintf(&bprint, ", max. %"PRId64" kb/s", enc->rc_max_rate / 1000);
701  }
702 }
703 
704 int avcodec_is_open(AVCodecContext *s)
705 {
706  return !!s->internal;
707 }
708 
709 int attribute_align_arg avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
710 {
711  av_frame_unref(frame);
712 
713  if (av_codec_is_decoder(avctx->codec))
714  return ff_decode_receive_frame(avctx, frame);
715  return ff_encode_receive_frame(avctx, frame);
716 }
AVSubtitle
Definition: avcodec.h:2351
avcodec_close
av_cold int avcodec_close(AVCodecContext *avctx)
Close a given AVCodecContext and free all the data associated with it (but not the AVCodecContext its...
Definition: avcodec.c:431
func
int(* func)(AVBPrint *dst, const char *in, const char *arg)
Definition: jacosubdec.c:68
av_packet_unref
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:422
AVCodecContext::hwaccel
const struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:1418
AVCodec
AVCodec.
Definition: codec.h:184
FF_ENABLE_DEPRECATION_WARNINGS
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:82
AVMEDIA_TYPE_SUBTITLE
@ AVMEDIA_TYPE_SUBTITLE
Definition: avutil.h:204
AV_CODEC_ID_VP6F
@ AV_CODEC_ID_VP6F
Definition: codec_id.h:144
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
AVERROR_EXPERIMENTAL
#define AVERROR_EXPERIMENTAL
Requested feature is flagged experimental. Set strict_std_compliance if you really want to use it.
Definition: error.h:74
FF_CODEC_CAP_INIT_CLEANUP
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: codec_internal.h:42
av_bprint_is_complete
static int av_bprint_is_complete(const AVBPrint *buf)
Test if the print buffer is complete (not truncated).
Definition: bprint.h:215
r
const char * r
Definition: vf_curves.c:126
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
opt.h
AVCodecContext::colorspace
enum AVColorSpace colorspace
YUV colorspace type.
Definition: avcodec.h:1015
av_opt_set_defaults
void av_opt_set_defaults(void *s)
Set the values of all AVOption fields to their default values.
Definition: opt.c:1459
AVCodecContext::sample_rate
int sample_rate
samples per second
Definition: avcodec.h:1047
AVCodec::priv_class
const AVClass * priv_class
AVClass for the private context.
Definition: codec.h:216
sub
static float sub(float src0, float src1)
Definition: dnn_backend_native_layer_mathbinary.c:31
av_popcount64
#define av_popcount64
Definition: common.h:152
thread.h
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2888
ff_thread_flush
void ff_thread_flush(AVCodecContext *avctx)
Wait for decoding threads to finish and reset internal state.
Definition: pthread_frame.c:865
rect
Definition: f_ebur128.c:76
avcodec_string
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
Definition: avcodec.c:505
AVCodecContext::coded_side_data
AVPacketSideData * coded_side_data
Additional data associated with the entire coded stream.
Definition: avcodec.h:1883
AVSubtitleRect
Definition: avcodec.h:2323
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:101
avcodec_find_encoder
const AVCodec * avcodec_find_encoder(enum AVCodecID id)
Find a registered encoder with a matching codec ID.
Definition: allcodecs.c:961
ff_encode_receive_frame
int ff_encode_receive_frame(AVCodecContext *avctx, AVFrame *frame)
avcodec_receive_frame() implementation for encoders.
Definition: encode.c:763
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:330
AVCodecContext::color_trc
enum AVColorTransferCharacteristic color_trc
Color Transfer Characteristic.
Definition: avcodec.h:1008
AVCodec::capabilities
int capabilities
Codec capabilities.
Definition: codec.h:203
internal.h
AVComponentDescriptor::depth
int depth
Number of bits in the component.
Definition: pixdesc.h:57
AVCodecContext::field_order
enum AVFieldOrder field_order
Field order.
Definition: avcodec.h:1044
AVCodecInternal::frame_thread_encoder
void * frame_thread_encoder
Definition: internal.h:105
AVCodecInternal::in_frame
AVFrame * in_frame
The input frame is stored here for encoders implementing the simple encode API.
Definition: internal.h:113
encode.h
AVCOL_TRC_UNSPECIFIED
@ AVCOL_TRC_UNSPECIFIED
Definition: pixfmt.h:561
unknown_if_null
static const char * unknown_if_null(const char *str)
Definition: avcodec.c:500
FF_CODEC_CAP_NOT_INIT_THREADSAFE
#define FF_CODEC_CAP_NOT_INIT_THREADSAFE
The codec is not known to be init-threadsafe (i.e.
Definition: codec_internal.h:34
FFCodec
Definition: codec_internal.h:127
AVCodecContext::subtitle_header
uint8_t * subtitle_header
Header containing style information for text subtitles.
Definition: avcodec.h:1744
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:196
FF_COMPLIANCE_EXPERIMENTAL
#define FF_COMPLIANCE_EXPERIMENTAL
Allow nonstandardized experimental things.
Definition: defs.h:62
AVDictionary
Definition: dict.c:32
AVChannelLayout::order
enum AVChannelOrder order
Channel order used in this layout.
Definition: channel_layout.h:306
avcodec_profile_name
const char * avcodec_profile_name(enum AVCodecID codec_id, int profile)
Return a name for the specified profile, if available.
Definition: utils.c:475
ff_thread_init
int ff_thread_init(AVCodecContext *avctx)
Definition: pthread.c:71
avcodec_is_open
int avcodec_is_open(AVCodecContext *s)
Definition: avcodec.c:704
AVChannelLayout::mask
uint64_t mask
This member must be used for AV_CHANNEL_ORDER_NATIVE, and may be used for AV_CHANNEL_ORDER_AMBISONIC ...
Definition: channel_layout.h:333
AVCodecContext::qmax
int qmax
maximum quantizer
Definition: avcodec.h:1238
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:311
codec_type
enum AVMediaType codec_type
Definition: rtp.c:37
ff_set_dimensions
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:91
av_bsf_free
void av_bsf_free(AVBSFContext **pctx)
Free a bitstream filter context and everything associated with it; write NULL into the supplied point...
Definition: bsf.c:53
thread.h
av_packet_free
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
Definition: avpacket.c:73
av_chroma_location_name
const char * av_chroma_location_name(enum AVChromaLocation location)
Definition: pixdesc.c:3285
AVCodecInternal::pool
AVBufferRef * pool
Definition: internal.h:71
av_gcd
int64_t av_gcd(int64_t a, int64_t b)
Compute the greatest common divisor of two integer operands.
Definition: mathematics.c:37
ff_mutex_unlock
static int ff_mutex_unlock(AVMutex *mutex)
Definition: thread.h:178
FFCodec::priv_data_size
int priv_data_size
Definition: codec_internal.h:145
fifo.h
bsf.h
av_color_space_name
const char * av_color_space_name(enum AVColorSpace space)
Definition: pixdesc.c:3264
av_bprint_init_for_buffer
void av_bprint_init_for_buffer(AVBPrint *buf, char *buffer, unsigned size)
Init a print buffer using a pre-existing buffer.
Definition: bprint.c:85
AVCodecContext::codec
const struct AVCodec * codec
Definition: avcodec.h:444
AVCodecContext::ch_layout
AVChannelLayout ch_layout
Audio channel layout.
Definition: avcodec.h:2075
AVCodecContext::thread_count
int thread_count
thread count is used to decide how many independent tasks should be passed to execute()
Definition: avcodec.h:1515
get_bit_rate
static int64_t get_bit_rate(AVCodecContext *ctx)
Definition: avcodec.c:85
AVCodecContext::initial_padding
int initial_padding
Audio only.
Definition: avcodec.h:1762
AVCodecContext::refs
int refs
number of reference frames
Definition: avcodec.h:987
AVCodecContext::flags
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:515
AV_FIELD_UNKNOWN
@ AV_FIELD_UNKNOWN
Definition: codec_par.h:39
AVCodecContext::coded_height
int coded_height
Definition: avcodec.h:622
AV_CODEC_CAP_ENCODER_FLUSH
#define AV_CODEC_CAP_ENCODER_FLUSH
This encoder can be flushed using avcodec_flush_buffers().
Definition: codec.h:163
av_reduce
int av_reduce(int *dst_num, int *dst_den, int64_t num, int64_t den, int64_t max)
Reduce a fraction.
Definition: rational.c:35
AVRational::num
int num
Numerator.
Definition: rational.h:59
av_image_check_size2
int av_image_check_size2(unsigned int w, unsigned int h, int64_t max_pixels, enum AVPixelFormat pix_fmt, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of a plane of an image with...
Definition: imgutils.c:289
avsubtitle_free
void avsubtitle_free(AVSubtitle *sub)
Free all allocated data in the given subtitle struct.
Definition: avcodec.c:409
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:89
AVFormatContext::bit_rate
int64_t bit_rate
Total stream bitrate in bit/s, 0 if not available.
Definition: avformat.h:1213
av_get_bits_per_sample
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:583
avassert.h
AVCodecContext::color_primaries
enum AVColorPrimaries color_primaries
Chromaticity coordinates of the source primaries.
Definition: avcodec.h:1001
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
frame_thread_encoder.h
AV_CODEC_CAP_EXPERIMENTAL
#define AV_CODEC_CAP_EXPERIMENTAL
Codec is experimental and is thus avoided in favor of non experimental encoders.
Definition: codec.h:99
av_cold
#define av_cold
Definition: attributes.h:90
ff_decode_receive_frame
int ff_decode_receive_frame(AVCodecContext *avctx, AVFrame *frame)
avcodec_receive_frame() implementation for decoders.
Definition: decode.c:697
FF_CODEC_PROPERTY_LOSSLESS
#define FF_CODEC_PROPERTY_LOSSLESS
Definition: avcodec.h:1873
AVMutex
#define AVMutex
Definition: thread.h:173
av_channel_layout_describe
int av_channel_layout_describe(const AVChannelLayout *channel_layout, char *buf, size_t buf_size)
Get a human-readable string describing the channel layout properties.
Definition: channel_layout.c:778
av_opt_set_dict
int av_opt_set_dict(void *obj, AVDictionary **options)
Set all the options from a given dictionary on an object.
Definition: opt.c:1767
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:537
s
#define s(width, name)
Definition: cbs_vp9.c:256
AVCodecInternal::buffer_pkt
AVPacket * buffer_pkt
Temporary buffers for newly received or not yet output packets/frames.
Definition: internal.h:147
av_bsf_flush
void av_bsf_flush(AVBSFContext *ctx)
Reset the internal bitstream filter state.
Definition: bsf.c:191
AVHWAccel::uninit
int(* uninit)(AVCodecContext *avctx)
Uninitialize the hwaccel private data.
Definition: avcodec.h:2223
g
const char * g
Definition: vf_curves.c:127
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AV_CHANNEL_ORDER_UNSPEC
@ AV_CHANNEL_ORDER_UNSPEC
Only the channel count is specified, without any further information about the channel order.
Definition: channel_layout.h:112
av_channel_layout_from_mask
FF_ENABLE_DEPRECATION_WARNINGS int av_channel_layout_from_mask(AVChannelLayout *channel_layout, uint64_t mask)
Initialize a native channel layout from a bitmask indicating which channels are present.
Definition: channel_layout.c:391
unlock_avcodec
static void unlock_avcodec(const FFCodec *codec)
Definition: avcodec.c:79
avcodec_receive_frame
int attribute_align_arg avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
Return decoded output data from a decoder or encoder (when the AV_CODEC_FLAG_RECON_FRAME flag is used...
Definition: avcodec.c:709
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
AVCodecContext::bits_per_raw_sample
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:1500
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
AVPacketSideData::data
uint8_t * data
Definition: packet.h:316
ctx
AVFormatContext * ctx
Definition: movenc.c:48
FFCodec::flush
void(* flush)(struct AVCodecContext *)
Flush buffers.
Definition: codec_internal.h:246
decode.h
AVCodecContext::max_pixels
int64_t max_pixels
The number of pixels per image to maximally accept.
Definition: avcodec.h:1927
ff_icc_context_uninit
void ff_icc_context_uninit(FFIccContext *s)
Definition: fflcms2.c:42
AVCodecContext::rc_max_rate
int64_t rc_max_rate
maximum bitrate
Definition: avcodec.h:1267
av_get_sample_fmt_name
const char * av_get_sample_fmt_name(enum AVSampleFormat sample_fmt)
Return the name of sample_fmt, or NULL if sample_fmt is not recognized.
Definition: samplefmt.c:51
AVMEDIA_TYPE_DATA
@ AVMEDIA_TYPE_DATA
Opaque data information usually continuous.
Definition: avutil.h:203
AVCOL_PRI_UNSPECIFIED
@ AVCOL_PRI_UNSPECIFIED
Definition: pixfmt.h:536
AV_CODEC_ID_H264
@ AV_CODEC_ID_H264
Definition: codec_id.h:79
ff_thread_free
void ff_thread_free(AVCodecContext *avctx)
Definition: pthread.c:83
FFCodec::init
int(* init)(struct AVCodecContext *)
Definition: codec_internal.h:178
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:445
FF_CODEC_PROPERTY_FILM_GRAIN
#define FF_CODEC_PROPERTY_FILM_GRAIN
Definition: avcodec.h:1875
arg
const char * arg
Definition: jacosubdec.c:67
if
if(ret)
Definition: filter_design.txt:179
av_color_range_name
const char * av_color_range_name(enum AVColorRange range)
Definition: pixdesc.c:3204
av_log_get_level
int av_log_get_level(void)
Get the current log level.
Definition: log.c:437
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
NULL
#define NULL
Definition: coverity.c:32
av_match_list
int av_match_list(const char *name, const char *list, char separator)
Check if a name is in a list.
Definition: avstring.c:445
AVCodecContext::color_range
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:1022
av_buffer_unref
void av_buffer_unref(AVBufferRef **buf)
Free a given reference and automatically free the buffer if there are no more references to it.
Definition: buffer.c:139
AVCodec::type
enum AVMediaType type
Definition: codec.h:197
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
AVCodecContext::nb_coded_side_data
int nb_coded_side_data
Definition: avcodec.h:1884
AVCodecContext::internal
struct AVCodecInternal * internal
Private context used for internal data.
Definition: avcodec.h:470
AVCodecContext::bit_rate
int64_t bit_rate
the average bitrate
Definition: avcodec.h:485
AVCodecContext::trailing_padding
int trailing_padding
Audio only.
Definition: avcodec.h:1919
av_color_primaries_name
const char * av_color_primaries_name(enum AVColorPrimaries primaries)
Definition: pixdesc.c:3222
av_opt_free
void av_opt_free(void *obj)
Free all allocated objects in obj.
Definition: opt.c:1719
avcodec_open2
int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
Definition: avcodec.c:115
AVCodecInternal::draining_done
int draining_done
Definition: internal.h:149
AVCOL_RANGE_UNSPECIFIED
@ AVCOL_RANGE_UNSPECIFIED
Definition: pixfmt.h:627
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
AVCodecInternal::last_pkt_props
AVPacket * last_pkt_props
Properties (timestamps+side data) extracted from the last packet passed for decoding.
Definition: internal.h:90
avcodec_find_decoder
const AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
Definition: allcodecs.c:966
AV_CODEC_CAP_CHANNEL_CONF
#define AV_CODEC_CAP_CHANNEL_CONF
Codec should fill in channel configuration and samplerate instead of container.
Definition: codec.h:103
AVCodecContext::time_base
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition: avcodec.h:557
av_codec_is_decoder
int av_codec_is_decoder(const AVCodec *codec)
Definition: utils.c:83
options
const OptionDef options[]
codec_internal.h
AVCodecInternal::hwaccel_priv_data
void * hwaccel_priv_data
hwaccel-specific private data
Definition: internal.h:137
AV_CODEC_ID_DXV
@ AV_CODEC_ID_DXV
Definition: codec_id.h:243
AVCodecInternal::bsf
struct AVBSFContext * bsf
Definition: internal.h:84
AVCodecContext::sample_fmt
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1063
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:56
AV_MUTEX_INITIALIZER
#define AV_MUTEX_INITIALIZER
Definition: thread.h:174
size
int size
Definition: twinvq_data.h:10344
AVCodecInternal::byte_buffer
uint8_t * byte_buffer
temporary buffer used for encoders to store their bitstream
Definition: internal.h:95
ffcodec
static const av_always_inline FFCodec * ffcodec(const AVCodec *codec)
Definition: codec_internal.h:325
AVCHROMA_LOC_UNSPECIFIED
@ AVCHROMA_LOC_UNSPECIFIED
Definition: pixfmt.h:681
AVMEDIA_TYPE_UNKNOWN
@ AVMEDIA_TYPE_UNKNOWN
Usually treated as AVMEDIA_TYPE_DATA.
Definition: avutil.h:200
codec_mutex
static AVMutex codec_mutex
Definition: avcodec.c:71
AV_CODEC_FLAG_PASS2
#define AV_CODEC_FLAG_PASS2
Use internal 2pass ratecontrol in second pass mode.
Definition: avcodec.h:302
encode
static void encode(AVCodecContext *ctx, AVFrame *frame, AVPacket *pkt, FILE *output)
Definition: encode_audio.c:94
AVCodecContext::pts_correction_last_pts
int64_t pts_correction_last_pts
Number of incorrect DTS values so far.
Definition: avcodec.h:1801
AV_FIELD_TT
@ AV_FIELD_TT
Top coded_first, top displayed first.
Definition: codec_par.h:41
avcodec_default_execute
int avcodec_default_execute(AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2), void *arg, int *ret, int count, int size)
Definition: avcodec.c:45
AVChannelLayout::u
union AVChannelLayout::@315 u
Details about which channels are present in this layout.
AV_CHANNEL_ORDER_NATIVE
@ AV_CHANNEL_ORDER_NATIVE
The native channel order, i.e.
Definition: channel_layout.h:118
ff_mutex_lock
static int ff_mutex_lock(AVMutex *mutex)
Definition: thread.h:177
av_packet_alloc
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
Definition: avpacket.c:62
AVCodecInternal
Definition: internal.h:52
AVCodecInternal::byte_buffer_size
unsigned int byte_buffer_size
Definition: internal.h:96
bitrate
int64_t bitrate
Definition: h264_levels.c:131
ff_encode_preinit
int ff_encode_preinit(AVCodecContext *avctx)
Definition: encode.c:667
FF_THREAD_FRAME
#define FF_THREAD_FRAME
Decode more than one frame at once.
Definition: avcodec.h:1526
AVCodec::id
enum AVCodecID id
Definition: codec.h:198
av_codec_is_encoder
int av_codec_is_encoder(const AVCodec *codec)
Definition: utils.c:75
avcodec_get_name
const char * avcodec_get_name(enum AVCodecID id)
Get the name of a codec.
Definition: utils.c:442
AVCodecContext::bits_per_coded_sample
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:1493
FFCodec::caps_internal
unsigned caps_internal
Internal codec capabilities FF_CODEC_CAP_*.
Definition: codec_internal.h:136
bprint.h
avcodec_default_execute2
int avcodec_default_execute2(AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2, int jobnr, int threadnr), void *arg, int *ret, int count)
Definition: avcodec.c:58
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:50
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
AVCodecContext::properties
unsigned properties
Properties of the stream that gets decoded.
Definition: avcodec.h:1872
av_get_bytes_per_sample
int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt)
Return number of bytes per sample.
Definition: samplefmt.c:108
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:536
AVCodecInternal::in_pkt
AVPacket * in_pkt
This packet is used to hold the packet given to decoders implementing the .decode API; it is unused b...
Definition: internal.h:83
AVCodecContext::pts_correction_last_dts
int64_t pts_correction_last_dts
PTS of the last frame.
Definition: avcodec.h:1802
ff_decode_preinit
int ff_decode_preinit(AVCodecContext *avctx)
Perform decoder initialization and validation.
Definition: decode.c:1616
AVMEDIA_TYPE_ATTACHMENT
@ AVMEDIA_TYPE_ATTACHMENT
Opaque data information usually sparse.
Definition: avutil.h:205
AVCodecContext::dump_separator
uint8_t * dump_separator
dump format separator.
Definition: avcodec.h:1857
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:484
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:254
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:191
AVCodecContext::hw_device_ctx
AVBufferRef * hw_device_ctx
A reference to the AVHWDeviceContext describing the device which will be used by a hardware encoder/d...
Definition: avcodec.h:1949
AVCodecContext::chroma_sample_location
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:1029
len
int len
Definition: vorbis_enc_data.h:426
profile
int profile
Definition: mxfenc.c:2111
AVCOL_SPC_UNSPECIFIED
@ AVCOL_SPC_UNSPECIFIED
Definition: pixfmt.h:590
AVCodecContext::height
int height
Definition: avcodec.h:607
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:644
AVCodecInternal::nb_draining_errors
int nb_draining_errors
Definition: internal.h:154
AVCodecContext::hw_frames_ctx
AVBufferRef * hw_frames_ctx
A reference to the AVHWFramesContext describing the input (for encoding) or output (decoding) frames.
Definition: avcodec.h:1908
avcodec.h
AVCodecContext::frame_num
int64_t frame_num
Frame counter, set by libavcodec.
Definition: avcodec.h:2086
ret
ret
Definition: filter_design.txt:187
AVCodecContext::block_align
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs.
Definition: avcodec.h:1096
avcodec_flush_buffers
void avcodec_flush_buffers(AVCodecContext *avctx)
Reset the internal codec state / flush internal buffers.
Definition: avcodec.c:369
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
AVCodecContext::strict_std_compliance
int strict_std_compliance
strictly follow the standard (MPEG-4, ...).
Definition: avcodec.h:1354
av_channel_layout_check
int av_channel_layout_check(const AVChannelLayout *channel_layout)
Check whether a channel layout is valid, i.e.
Definition: channel_layout.c:906
av_bprintf
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:94
AVCodecInternal::recon_frame
AVFrame * recon_frame
When the AV_CODEC_FLAG_RECON_FRAME flag is used.
Definition: internal.h:121
AVCodecInternal::needs_close
int needs_close
If this is set, then FFCodec->close (if existing) needs to be called for the parent AVCodecContext.
Definition: internal.h:127
av_get_media_type_string
const char * av_get_media_type_string(enum AVMediaType media_type)
Return a string describing the media_type enum, NULL if media_type is unknown.
Definition: utils.c:28
AVCodecContext
main external API structure.
Definition: avcodec.h:435
AVCodecContext::active_thread_type
int active_thread_type
Which multithreading methods are in use by the codec.
Definition: avcodec.h:1534
AVCodecContext::codec_descriptor
const AVCodecDescriptor * codec_descriptor
AVCodecDescriptor.
Definition: avcodec.h:1792
c2
static const uint64_t c2
Definition: murmur3.c:52
channel_layout.h
AVCodecContext::qmin
int qmin
minimum quantizer
Definition: avcodec.h:1231
AVRational::den
int den
Denominator.
Definition: rational.h:60
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
AVCodecContext::profile
int profile
profile
Definition: avcodec.h:1578
av_channel_layout_uninit
void av_channel_layout_uninit(AVChannelLayout *channel_layout)
Free any allocated data in the channel layout and reset the channel count to 0.
Definition: channel_layout.c:632
AVPixFmtDescriptor::comp
AVComponentDescriptor comp[4]
Parameters that describe how pixels are packed.
Definition: pixdesc.h:105
FF_CODEC_PROPERTY_CLOSED_CAPTIONS
#define FF_CODEC_PROPERTY_CLOSED_CAPTIONS
Definition: avcodec.h:1874
FFCodec::close
int(* close)(struct AVCodecContext *)
Definition: codec_internal.h:240
ff_frame_thread_encoder_free
av_cold void ff_frame_thread_encoder_free(AVCodecContext *avctx)
Definition: frame_thread_encoder.c:241
AVCodecInternal::buffer_frame
AVFrame * buffer_frame
Definition: internal.h:148
AVCodecInternal::draining
int draining
checks API usage: after codec draining, flush is required to resume operation
Definition: internal.h:142
FF_DISABLE_DEPRECATION_WARNINGS
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:81
AVCodecContext::coded_width
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:622
AVCodecContext::codec_type
enum AVMediaType codec_type
Definition: avcodec.h:443
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
mem.h
FF_CODEC_CAP_AUTO_THREADS
#define FF_CODEC_CAP_AUTO_THREADS
Codec handles avctx->thread_count == 0 (auto) internally.
Definition: codec_internal.h:73
AVCodecInternal::initial_ch_layout
AVChannelLayout initial_ch_layout
Definition: internal.h:161
AVCodecContext::codec_tag
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:460
FF_MAX_EXTRADATA_SIZE
#define FF_MAX_EXTRADATA_SIZE
Maximum size in bytes of extradata.
Definition: internal.h:183
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:462
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
AV_FIELD_TB
@ AV_FIELD_TB
Top coded first, bottom displayed first.
Definition: codec_par.h:43
codec_string
Definition: dashenc.c:207
AV_FIELD_BB
@ AV_FIELD_BB
Bottom coded first, bottom displayed first.
Definition: codec_par.h:42
AVCodecInternal::thread_ctx
void * thread_ctx
Definition: internal.h:73
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:607
convert_header.str
string str
Definition: convert_header.py:20
imgutils.h
AVCodecContext::frame_number
attribute_deprecated int frame_number
Frame counter, set by libavcodec.
Definition: avcodec.h:1089
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
av_bprint_chars
void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
Append char c n times to a print buffer.
Definition: bprint.c:140
avcodec_descriptor_get
const AVCodecDescriptor * avcodec_descriptor_get(enum AVCodecID id)
Definition: codec_desc.c:3671
av_image_check_sar
int av_image_check_sar(unsigned int w, unsigned int h, AVRational sar)
Check if the given sample aspect ratio of an image is valid.
Definition: imgutils.c:323
avstring.h
FF_SANE_NB_CHANNELS
#define FF_SANE_NB_CHANNELS
Definition: internal.h:40
AVCodecContext::codec_whitelist
char * codec_whitelist
',' separated list of allowed decoders.
Definition: avcodec.h:1865
lock_avcodec
static void lock_avcodec(const FFCodec *codec)
Definition: avcodec.c:73
AV_FIELD_BT
@ AV_FIELD_BT
Bottom coded first, top displayed first.
Definition: codec_par.h:44
av_color_transfer_name
const char * av_color_transfer_name(enum AVColorTransferCharacteristic transfer)
Definition: pixdesc.c:3243
AVCodecContext::sample_aspect_ratio
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel.
Definition: avcodec.h:808
av_get_pix_fmt_name
const char * av_get_pix_fmt_name(enum AVPixelFormat pix_fmt)
Return the short name for a pixel format, NULL in case pix_fmt is unknown.
Definition: pixdesc.c:2808
AV_CODEC_FLAG_PASS1
#define AV_CODEC_FLAG_PASS1
Use internal 2pass ratecontrol in first pass mode.
Definition: avcodec.h:298
av_fourcc2str
#define av_fourcc2str(fourcc)
Definition: avutil.h:354
Generated on Tue Mar 28 2023 19:21:15 for FFmpeg by   doxygen 1.8.17