FFmpeg
avcodec.c
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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/emms.h"
32 #include "libavutil/fifo.h"
33 #include "libavutil/imgutils.h"
34 #include "libavutil/mem.h"
35 #include "libavutil/opt.h"
36 #include "libavutil/thread.h"
37 #include "avcodec.h"
38 #include "avcodec_internal.h"
39 #include "bsf.h"
40 #include "codec_desc.h"
41 #include "codec_internal.h"
42 #include "decode.h"
43 #include "encode.h"
44 #include "frame_thread_encoder.h"
45 #include "hwconfig.h"
46 #include "internal.h"
47 #include "refstruct.h"
48 #include "thread.h"
49 
50 /**
51  * Maximum size in bytes of extradata.
52  * This value was chosen such that every bit of the buffer is
53  * addressable by a 32-bit signed integer as used by get_bits.
54  */
55 #define FF_MAX_EXTRADATA_SIZE ((1 << 28) - AV_INPUT_BUFFER_PADDING_SIZE)
56 
57 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2), void *arg, int *ret, int count, int size)
58 {
59  size_t i;
60 
61  for (i = 0; i < count; i++) {
62  size_t offset = i * size;
63  int r = func(c, FF_PTR_ADD((char *)arg, offset));
64  if (ret)
65  ret[i] = r;
66  }
67  emms_c();
68  return 0;
69 }
70 
71 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int jobnr, int threadnr), void *arg, int *ret, int count)
72 {
73  int i;
74 
75  for (i = 0; i < count; i++) {
76  int r = func(c, arg, i, 0);
77  if (ret)
78  ret[i] = r;
79  }
80  emms_c();
81  return 0;
82 }
83 
84 static AVMutex codec_mutex = AV_MUTEX_INITIALIZER;
85 
86 static void lock_avcodec(const FFCodec *codec)
87 {
88  if (codec->caps_internal & FF_CODEC_CAP_NOT_INIT_THREADSAFE && codec->init)
89  ff_mutex_lock(&codec_mutex);
90 }
91 
92 static void unlock_avcodec(const FFCodec *codec)
93 {
94  if (codec->caps_internal & FF_CODEC_CAP_NOT_INIT_THREADSAFE && codec->init)
95  ff_mutex_unlock(&codec_mutex);
96 }
97 
98 static int64_t get_bit_rate(AVCodecContext *ctx)
99 {
100  int64_t bit_rate;
101  int bits_per_sample;
102 
103  switch (ctx->codec_type) {
104  case AVMEDIA_TYPE_VIDEO:
105  case AVMEDIA_TYPE_DATA:
106  case AVMEDIA_TYPE_SUBTITLE:
107  case AVMEDIA_TYPE_ATTACHMENT:
108  bit_rate = ctx->bit_rate;
109  break;
110  case AVMEDIA_TYPE_AUDIO:
111  bits_per_sample = av_get_bits_per_sample(ctx->codec_id);
112  if (bits_per_sample) {
113  bit_rate = ctx->sample_rate * (int64_t)ctx->ch_layout.nb_channels;
114  if (bit_rate > INT64_MAX / bits_per_sample) {
115  bit_rate = 0;
116  } else
117  bit_rate *= bits_per_sample;
118  } else
119  bit_rate = ctx->bit_rate;
120  break;
121  default:
122  bit_rate = 0;
123  break;
124  }
125  return bit_rate;
126 }
127 
128 int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
129 {
130  int ret = 0;
131  AVCodecInternal *avci;
132  const FFCodec *codec2;
133 
134  if (avcodec_is_open(avctx))
135  return 0;
136 
137  if (!codec && !avctx->codec) {
138  av_log(avctx, AV_LOG_ERROR, "No codec provided to avcodec_open2()\n");
139  return AVERROR(EINVAL);
140  }
141  if (codec && avctx->codec && codec != avctx->codec) {
142  av_log(avctx, AV_LOG_ERROR, "This AVCodecContext was allocated for %s, "
143  "but %s passed to avcodec_open2()\n", avctx->codec->name, codec->name);
144  return AVERROR(EINVAL);
145  }
146  if (!codec)
147  codec = avctx->codec;
148  codec2 = ffcodec(codec);
149 
150  if ((avctx->codec_type != AVMEDIA_TYPE_UNKNOWN && avctx->codec_type != codec->type) ||
151  (avctx->codec_id != AV_CODEC_ID_NONE && avctx->codec_id != codec->id)) {
152  av_log(avctx, AV_LOG_ERROR, "Codec type or id mismatches\n");
153  return AVERROR(EINVAL);
154  }
155 
156  avctx->codec_type = codec->type;
157  avctx->codec_id = codec->id;
158  avctx->codec = codec;
159 
160  if (avctx->extradata_size < 0 || avctx->extradata_size >= FF_MAX_EXTRADATA_SIZE)
161  return AVERROR(EINVAL);
162 
163  avci = av_codec_is_decoder(codec) ?
164  ff_decode_internal_alloc() :
165  ff_encode_internal_alloc();
166  if (!avci) {
167  ret = AVERROR(ENOMEM);
168  goto end;
169  }
170  avctx->internal = avci;
171 
172  avci->buffer_frame = av_frame_alloc();
173  avci->buffer_pkt = av_packet_alloc();
174  if (!avci->buffer_frame || !avci->buffer_pkt) {
175  ret = AVERROR(ENOMEM);
176  goto free_and_end;
177  }
178 
179  if (codec2->priv_data_size > 0) {
180  if (!avctx->priv_data) {
181  avctx->priv_data = av_mallocz(codec2->priv_data_size);
182  if (!avctx->priv_data) {
183  ret = AVERROR(ENOMEM);
184  goto free_and_end;
185  }
186  if (codec->priv_class) {
187  *(const AVClass **)avctx->priv_data = codec->priv_class;
188  av_opt_set_defaults(avctx->priv_data);
189  }
190  }
191  if (codec->priv_class && (ret = av_opt_set_dict(avctx->priv_data, options)) < 0)
192  goto free_and_end;
193  } else {
194  avctx->priv_data = NULL;
195  }
196  if ((ret = av_opt_set_dict(avctx, options)) < 0)
197  goto free_and_end;
198 
199  if (avctx->codec_whitelist && av_match_list(codec->name, avctx->codec_whitelist, ',') <= 0) {
200  av_log(avctx, AV_LOG_ERROR, "Codec (%s) not on whitelist \'%s\'\n", codec->name, avctx->codec_whitelist);
201  ret = AVERROR(EINVAL);
202  goto free_and_end;
203  }
204 
205  // only call ff_set_dimensions() for non H.264/VP6F/DXV codecs so as not to overwrite previously setup dimensions
206  if (!(avctx->coded_width && avctx->coded_height && avctx->width && avctx->height &&
207  (avctx->codec_id == AV_CODEC_ID_H264 || avctx->codec_id == AV_CODEC_ID_VP6F || avctx->codec_id == AV_CODEC_ID_DXV))) {
208  if (avctx->coded_width && avctx->coded_height)
209  ret = ff_set_dimensions(avctx, avctx->coded_width, avctx->coded_height);
210  else if (avctx->width && avctx->height)
211  ret = ff_set_dimensions(avctx, avctx->width, avctx->height);
212  if (ret < 0)
213  goto free_and_end;
214  }
215 
216  if ((avctx->coded_width || avctx->coded_height || avctx->width || avctx->height)
217  && ( av_image_check_size2(avctx->coded_width, avctx->coded_height, avctx->max_pixels, AV_PIX_FMT_NONE, 0, avctx) < 0
218  || av_image_check_size2(avctx->width, avctx->height, avctx->max_pixels, AV_PIX_FMT_NONE, 0, avctx) < 0)) {
219  av_log(avctx, AV_LOG_WARNING, "Ignoring invalid width/height values\n");
220  ff_set_dimensions(avctx, 0, 0);
221  }
222 
223  if (avctx->width > 0 && avctx->height > 0) {
224  if (av_image_check_sar(avctx->width, avctx->height,
225  avctx->sample_aspect_ratio) < 0) {
226  av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
227  avctx->sample_aspect_ratio.num,
228  avctx->sample_aspect_ratio.den);
229  avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
230  }
231  }
232 
233  if (avctx->sample_rate < 0) {
234  av_log(avctx, AV_LOG_ERROR, "Invalid sample rate: %d\n", avctx->sample_rate);
235  ret = AVERROR(EINVAL);
236  goto free_and_end;
237  }
238  if (avctx->block_align < 0) {
239  av_log(avctx, AV_LOG_ERROR, "Invalid block align: %d\n", avctx->block_align);
240  ret = AVERROR(EINVAL);
241  goto free_and_end;
242  }
243 
244 #if FF_API_OLD_CHANNEL_LAYOUT
245 FF_DISABLE_DEPRECATION_WARNINGS
246  /* compat wrapper for old-style callers */
247  if (avctx->channel_layout && !avctx->channels)
248  avctx->channels = av_popcount64(avctx->channel_layout);
249 
250  if ((avctx->channels && avctx->ch_layout.nb_channels != avctx->channels) ||
251  (avctx->channel_layout && (avctx->ch_layout.order != AV_CHANNEL_ORDER_NATIVE ||
252  avctx->ch_layout.u.mask != avctx->channel_layout))) {
253  av_channel_layout_uninit(&avctx->ch_layout);
254  if (avctx->channel_layout) {
255  av_channel_layout_from_mask(&avctx->ch_layout, avctx->channel_layout);
256  } else {
257  avctx->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
258  }
259  avctx->ch_layout.nb_channels = avctx->channels;
260  }
261 FF_ENABLE_DEPRECATION_WARNINGS
262 #endif
263 
264  /* AV_CODEC_CAP_CHANNEL_CONF is a decoder-only flag; so the code below
265  * in particular checks that nb_channels is set for all audio encoders. */
266  if (avctx->codec_type == AVMEDIA_TYPE_AUDIO && !avctx->ch_layout.nb_channels
267  && !(codec->capabilities & AV_CODEC_CAP_CHANNEL_CONF)) {
268  av_log(avctx, AV_LOG_ERROR, "%s requires channel layout to be set\n",
269  av_codec_is_decoder(codec) ? "Decoder" : "Encoder");
270  ret = AVERROR(EINVAL);
271  goto free_and_end;
272  }
273  if (avctx->ch_layout.nb_channels && !av_channel_layout_check(&avctx->ch_layout)) {
274  av_log(avctx, AV_LOG_ERROR, "Invalid channel layout\n");
275  ret = AVERROR(EINVAL);
276  goto free_and_end;
277  }
278  if (avctx->ch_layout.nb_channels > FF_SANE_NB_CHANNELS) {
279  av_log(avctx, AV_LOG_ERROR, "Too many channels: %d\n", avctx->ch_layout.nb_channels);
280  ret = AVERROR(EINVAL);
281  goto free_and_end;
282  }
283 
284  avctx->frame_num = 0;
285 #if FF_API_AVCTX_FRAME_NUMBER
286 FF_DISABLE_DEPRECATION_WARNINGS
287  avctx->frame_number = avctx->frame_num;
288 FF_ENABLE_DEPRECATION_WARNINGS
289 #endif
290  avctx->codec_descriptor = avcodec_descriptor_get(avctx->codec_id);
291 
292  if ((avctx->codec->capabilities & AV_CODEC_CAP_EXPERIMENTAL) &&
293  avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
294  const char *codec_string = av_codec_is_encoder(codec) ? "encoder" : "decoder";
295  const AVCodec *codec2;
296  av_log(avctx, AV_LOG_ERROR,
297  "The %s '%s' is experimental but experimental codecs are not enabled, "
298  "add '-strict %d' if you want to use it.\n",
299  codec_string, codec->name, FF_COMPLIANCE_EXPERIMENTAL);
300  codec2 = av_codec_is_encoder(codec) ? avcodec_find_encoder(codec->id) : avcodec_find_decoder(codec->id);
301  if (!(codec2->capabilities & AV_CODEC_CAP_EXPERIMENTAL))
302  av_log(avctx, AV_LOG_ERROR, "Alternatively use the non experimental %s '%s'.\n",
303  codec_string, codec2->name);
304  ret = AVERROR_EXPERIMENTAL;
305  goto free_and_end;
306  }
307 
308  if (avctx->codec_type == AVMEDIA_TYPE_AUDIO &&
309  (!avctx->time_base.num || !avctx->time_base.den)) {
310  avctx->time_base.num = 1;
311  avctx->time_base.den = avctx->sample_rate;
312  }
313 
314  if (av_codec_is_encoder(avctx->codec))
315  ret = ff_encode_preinit(avctx);
316  else
317  ret = ff_decode_preinit(avctx);
318  if (ret < 0)
319  goto free_and_end;
320 
321  if (HAVE_THREADS && !avci->frame_thread_encoder) {
322  /* Frame-threaded decoders call FFCodec.init for their child contexts. */
323  lock_avcodec(codec2);
324  ret = ff_thread_init(avctx);
325  unlock_avcodec(codec2);
326  if (ret < 0) {
327  goto free_and_end;
328  }
329  }
330  if (!HAVE_THREADS && !(codec2->caps_internal & FF_CODEC_CAP_AUTO_THREADS))
331  avctx->thread_count = 1;
332 
333  if (!(avctx->active_thread_type & FF_THREAD_FRAME) ||
334  avci->frame_thread_encoder) {
335  if (codec2->init) {
336  lock_avcodec(codec2);
337  ret = codec2->init(avctx);
338  unlock_avcodec(codec2);
339  if (ret < 0) {
340  avci->needs_close = codec2->caps_internal & FF_CODEC_CAP_INIT_CLEANUP;
341  goto free_and_end;
342  }
343  }
344  avci->needs_close = 1;
345  }
346 
347  ret=0;
348 
349  if (av_codec_is_decoder(avctx->codec)) {
350  if (!avctx->bit_rate)
351  avctx->bit_rate = get_bit_rate(avctx);
352 
353 #if FF_API_OLD_CHANNEL_LAYOUT
354 FF_DISABLE_DEPRECATION_WARNINGS
355  /* update the deprecated fields for old-style callers */
356  avctx->channels = avctx->ch_layout.nb_channels;
357  avctx->channel_layout = avctx->ch_layout.order == AV_CHANNEL_ORDER_NATIVE ?
358  avctx->ch_layout.u.mask : 0;
359 FF_ENABLE_DEPRECATION_WARNINGS
360 #endif
361 
362  /* validate channel layout from the decoder */
363  if ((avctx->ch_layout.nb_channels && !av_channel_layout_check(&avctx->ch_layout)) ||
364  avctx->ch_layout.nb_channels > FF_SANE_NB_CHANNELS) {
365  ret = AVERROR(EINVAL);
366  goto free_and_end;
367  }
368  if (avctx->bits_per_coded_sample < 0) {
369  ret = AVERROR(EINVAL);
370  goto free_and_end;
371  }
372  }
373  if (codec->priv_class)
374  av_assert0(*(const AVClass **)avctx->priv_data == codec->priv_class);
375 
376 end:
377 
378  return ret;
379 free_and_end:
380  avcodec_close(avctx);
381  goto end;
382 }
383 
384 void avcodec_flush_buffers(AVCodecContext *avctx)
385 {
386  AVCodecInternal *avci = avctx->internal;
387 
388  if (av_codec_is_encoder(avctx->codec)) {
389  int caps = avctx->codec->capabilities;
390 
391  if (!(caps & AV_CODEC_CAP_ENCODER_FLUSH)) {
392  // Only encoders that explicitly declare support for it can be
393  // flushed. Otherwise, this is a no-op.
394  av_log(avctx, AV_LOG_WARNING, "Ignoring attempt to flush encoder "
395  "that doesn't support it\n");
396  return;
397  }
398  ff_encode_flush_buffers(avctx);
399  } else
400  ff_decode_flush_buffers(avctx);
401 
402  avci->draining = 0;
403  avci->draining_done = 0;
404  av_frame_unref(avci->buffer_frame);
405  av_packet_unref(avci->buffer_pkt);
406 
407  if (HAVE_THREADS && avctx->active_thread_type & FF_THREAD_FRAME)
408  ff_thread_flush(avctx);
409  else if (ffcodec(avctx->codec)->flush)
410  ffcodec(avctx->codec)->flush(avctx);
411 }
412 
413 void avsubtitle_free(AVSubtitle *sub)
414 {
415  int i;
416 
417  for (i = 0; i < sub->num_rects; i++) {
418  AVSubtitleRect *const rect = sub->rects[i];
419 
420  av_freep(&rect->data[0]);
421  av_freep(&rect->data[1]);
422  av_freep(&rect->data[2]);
423  av_freep(&rect->data[3]);
424  av_freep(&rect->text);
425  av_freep(&rect->ass);
426 
427  av_freep(&sub->rects[i]);
428  }
429 
430  av_freep(&sub->rects);
431 
432  memset(sub, 0, sizeof(*sub));
433 }
434 
435 av_cold int avcodec_close(AVCodecContext *avctx)
436 {
437  int i;
438 
439  if (!avctx)
440  return 0;
441 
442  if (avcodec_is_open(avctx)) {
443  AVCodecInternal *avci = avctx->internal;
444 
445  if (CONFIG_FRAME_THREAD_ENCODER &&
446  avci->frame_thread_encoder && avctx->thread_count > 1) {
447  ff_frame_thread_encoder_free(avctx);
448  }
449  if (HAVE_THREADS && avci->thread_ctx)
450  ff_thread_free(avctx);
451  if (avci->needs_close && ffcodec(avctx->codec)->close)
452  ffcodec(avctx->codec)->close(avctx);
453  avci->byte_buffer_size = 0;
454  av_freep(&avci->byte_buffer);
455  av_frame_free(&avci->buffer_frame);
456  av_packet_free(&avci->buffer_pkt);
457  av_packet_free(&avci->last_pkt_props);
458 
459  av_packet_free(&avci->in_pkt);
460  av_frame_free(&avci->in_frame);
461  av_frame_free(&avci->recon_frame);
462 
463  ff_refstruct_unref(&avci->pool);
464 
465  ff_hwaccel_uninit(avctx);
466 
467  av_bsf_free(&avci->bsf);
468 
469 #if FF_API_DROPCHANGED
470  av_channel_layout_uninit(&avci->initial_ch_layout);
471 #endif
472 
473 #if CONFIG_LCMS2
474  ff_icc_context_uninit(&avci->icc);
475 #endif
476 
477  av_freep(&avctx->internal);
478  }
479 
480  for (i = 0; i < avctx->nb_coded_side_data; i++)
481  av_freep(&avctx->coded_side_data[i].data);
482  av_freep(&avctx->coded_side_data);
483  avctx->nb_coded_side_data = 0;
484 
485  av_buffer_unref(&avctx->hw_frames_ctx);
486  av_buffer_unref(&avctx->hw_device_ctx);
487 
488  if (avctx->priv_data && avctx->codec && avctx->codec->priv_class)
489  av_opt_free(avctx->priv_data);
490  av_opt_free(avctx);
491  av_freep(&avctx->priv_data);
492  if (av_codec_is_encoder(avctx->codec)) {
493  av_freep(&avctx->extradata);
494  avctx->extradata_size = 0;
495  } else if (av_codec_is_decoder(avctx->codec))
496  av_freep(&avctx->subtitle_header);
497 
498  avctx->codec = NULL;
499  avctx->active_thread_type = 0;
500 
501  return 0;
502 }
503 
504 static const char *unknown_if_null(const char *str)
505 {
506  return str ? str : "unknown";
507 }
508 
509 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
510 {
511  const char *codec_type;
512  const char *codec_name;
513  const char *profile = NULL;
514  AVBPrint bprint;
515  int64_t bitrate;
516  int new_line = 0;
517  AVRational display_aspect_ratio;
518  const char *separator = enc->dump_separator ? (const char *)enc->dump_separator : ", ";
519  const char *str;
520 
521  if (!buf || buf_size <= 0)
522  return;
523  av_bprint_init_for_buffer(&bprint, buf, buf_size);
524  codec_type = av_get_media_type_string(enc->codec_type);
525  codec_name = avcodec_get_name(enc->codec_id);
526  profile = avcodec_profile_name(enc->codec_id, enc->profile);
527 
528  av_bprintf(&bprint, "%s: %s", codec_type ? codec_type : "unknown",
529  codec_name);
530  buf[0] ^= 'a' ^ 'A'; /* first letter in uppercase */
531 
532  if (enc->codec && strcmp(enc->codec->name, codec_name))
533  av_bprintf(&bprint, " (%s)", enc->codec->name);
534 
535  if (profile)
536  av_bprintf(&bprint, " (%s)", profile);
537  if ( enc->codec_type == AVMEDIA_TYPE_VIDEO
538  && av_log_get_level() >= AV_LOG_VERBOSE
539  && enc->refs)
540  av_bprintf(&bprint, ", %d reference frame%s",
541  enc->refs, enc->refs > 1 ? "s" : "");
542 
543  if (enc->codec_tag)
544  av_bprintf(&bprint, " (%s / 0x%04X)",
545  av_fourcc2str(enc->codec_tag), enc->codec_tag);
546 
547  switch (enc->codec_type) {
548  case AVMEDIA_TYPE_VIDEO:
549  {
550  unsigned len;
551 
552  av_bprintf(&bprint, "%s%s", separator,
553  enc->pix_fmt == AV_PIX_FMT_NONE ? "none" :
554  unknown_if_null(av_get_pix_fmt_name(enc->pix_fmt)));
555 
556  av_bprint_chars(&bprint, '(', 1);
557  len = bprint.len;
558 
559  /* The following check ensures that '(' has been written
560  * and therefore allows us to erase it if it turns out
561  * to be unnecessary. */
562  if (!av_bprint_is_complete(&bprint))
563  return;
564 
565  if (enc->bits_per_raw_sample && enc->pix_fmt != AV_PIX_FMT_NONE &&
566  enc->bits_per_raw_sample < av_pix_fmt_desc_get(enc->pix_fmt)->comp[0].depth)
567  av_bprintf(&bprint, "%d bpc, ", enc->bits_per_raw_sample);
568  if (enc->color_range != AVCOL_RANGE_UNSPECIFIED &&
569  (str = av_color_range_name(enc->color_range)))
570  av_bprintf(&bprint, "%s, ", str);
571 
572  if (enc->colorspace != AVCOL_SPC_UNSPECIFIED ||
573  enc->color_primaries != AVCOL_PRI_UNSPECIFIED ||
574  enc->color_trc != AVCOL_TRC_UNSPECIFIED) {
575  const char *col = unknown_if_null(av_color_space_name(enc->colorspace));
576  const char *pri = unknown_if_null(av_color_primaries_name(enc->color_primaries));
577  const char *trc = unknown_if_null(av_color_transfer_name(enc->color_trc));
578  if (strcmp(col, pri) || strcmp(col, trc)) {
579  new_line = 1;
580  av_bprintf(&bprint, "%s/%s/%s, ", col, pri, trc);
581  } else
582  av_bprintf(&bprint, "%s, ", col);
583  }
584 
585  if (enc->field_order != AV_FIELD_UNKNOWN) {
586  const char *field_order = "progressive";
587  if (enc->field_order == AV_FIELD_TT)
588  field_order = "top first";
589  else if (enc->field_order == AV_FIELD_BB)
590  field_order = "bottom first";
591  else if (enc->field_order == AV_FIELD_TB)
592  field_order = "top coded first (swapped)";
593  else if (enc->field_order == AV_FIELD_BT)
594  field_order = "bottom coded first (swapped)";
595 
596  av_bprintf(&bprint, "%s, ", field_order);
597  }
598 
599  if (av_log_get_level() >= AV_LOG_VERBOSE &&
600  enc->chroma_sample_location != AVCHROMA_LOC_UNSPECIFIED &&
601  (str = av_chroma_location_name(enc->chroma_sample_location)))
602  av_bprintf(&bprint, "%s, ", str);
603 
604  if (len == bprint.len) {
605  bprint.str[len - 1] = '\0';
606  bprint.len--;
607  } else {
608  if (bprint.len - 2 < bprint.size) {
609  /* Erase the last ", " */
610  bprint.len -= 2;
611  bprint.str[bprint.len] = '\0';
612  }
613  av_bprint_chars(&bprint, ')', 1);
614  }
615  }
616 
617  if (enc->width) {
618  av_bprintf(&bprint, "%s%dx%d", new_line ? separator : ", ",
619  enc->width, enc->height);
620 
621  if (av_log_get_level() >= AV_LOG_VERBOSE &&
622  (enc->width != enc->coded_width ||
623  enc->height != enc->coded_height))
624  av_bprintf(&bprint, " (%dx%d)",
625  enc->coded_width, enc->coded_height);
626 
627  if (enc->sample_aspect_ratio.num) {
628  av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den,
629  enc->width * (int64_t)enc->sample_aspect_ratio.num,
630  enc->height * (int64_t)enc->sample_aspect_ratio.den,
631  1024 * 1024);
632  av_bprintf(&bprint, " [SAR %d:%d DAR %d:%d]",
633  enc->sample_aspect_ratio.num, enc->sample_aspect_ratio.den,
634  display_aspect_ratio.num, display_aspect_ratio.den);
635  }
636  if (av_log_get_level() >= AV_LOG_DEBUG) {
637  int g = av_gcd(enc->time_base.num, enc->time_base.den);
638  av_bprintf(&bprint, ", %d/%d",
639  enc->time_base.num / g, enc->time_base.den / g);
640  }
641  }
642  if (encode) {
643  av_bprintf(&bprint, ", q=%d-%d", enc->qmin, enc->qmax);
644  } else {
645  if (enc->properties & FF_CODEC_PROPERTY_CLOSED_CAPTIONS)
646  av_bprintf(&bprint, ", Closed Captions");
647  if (enc->properties & FF_CODEC_PROPERTY_FILM_GRAIN)
648  av_bprintf(&bprint, ", Film Grain");
649  if (enc->properties & FF_CODEC_PROPERTY_LOSSLESS)
650  av_bprintf(&bprint, ", lossless");
651  }
652  break;
653  case AVMEDIA_TYPE_AUDIO:
654  av_bprintf(&bprint, "%s", separator);
655 
656  if (enc->sample_rate) {
657  av_bprintf(&bprint, "%d Hz, ", enc->sample_rate);
658  }
659  {
660  char buf[512];
661  int ret = av_channel_layout_describe(&enc->ch_layout, buf, sizeof(buf));
662  if (ret >= 0)
663  av_bprintf(&bprint, "%s", buf);
664  }
665  if (enc->sample_fmt != AV_SAMPLE_FMT_NONE &&
666  (str = av_get_sample_fmt_name(enc->sample_fmt))) {
667  av_bprintf(&bprint, ", %s", str);
668  }
669  if ( enc->bits_per_raw_sample > 0
670  && enc->bits_per_raw_sample != av_get_bytes_per_sample(enc->sample_fmt) * 8)
671  av_bprintf(&bprint, " (%d bit)", enc->bits_per_raw_sample);
672  if (av_log_get_level() >= AV_LOG_VERBOSE) {
673  if (enc->initial_padding)
674  av_bprintf(&bprint, ", delay %d", enc->initial_padding);
675  if (enc->trailing_padding)
676  av_bprintf(&bprint, ", padding %d", enc->trailing_padding);
677  }
678  break;
679  case AVMEDIA_TYPE_DATA:
680  if (av_log_get_level() >= AV_LOG_DEBUG) {
681  int g = av_gcd(enc->time_base.num, enc->time_base.den);
682  if (g)
683  av_bprintf(&bprint, ", %d/%d",
684  enc->time_base.num / g, enc->time_base.den / g);
685  }
686  break;
687  case AVMEDIA_TYPE_SUBTITLE:
688  if (enc->width)
689  av_bprintf(&bprint, ", %dx%d", enc->width, enc->height);
690  break;
691  default:
692  return;
693  }
694  if (encode) {
695  if (enc->flags & AV_CODEC_FLAG_PASS1)
696  av_bprintf(&bprint, ", pass 1");
697  if (enc->flags & AV_CODEC_FLAG_PASS2)
698  av_bprintf(&bprint, ", pass 2");
699  }
700  bitrate = get_bit_rate(enc);
701  if (bitrate != 0) {
702  av_bprintf(&bprint, ", %"PRId64" kb/s", bitrate / 1000);
703  } else if (enc->rc_max_rate > 0) {
704  av_bprintf(&bprint, ", max. %"PRId64" kb/s", enc->rc_max_rate / 1000);
705  }
706 }
707 
708 int avcodec_is_open(AVCodecContext *s)
709 {
710  return !!s->internal;
711 }
712 
713 int attribute_align_arg avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
714 {
715  av_frame_unref(frame);
716 
717  if (av_codec_is_decoder(avctx->codec))
718  return ff_decode_receive_frame(avctx, frame);
719  return ff_encode_receive_frame(avctx, frame);
720 }
AVSubtitle
Definition: avcodec.h:2269
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:435
func
int(* func)(AVBPrint *dst, const char *in, const char *arg)
Definition: jacosubdec.c:68
hwconfig.h
av_packet_unref
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:423
AVCodec
AVCodec.
Definition: codec.h:187
FF_ENABLE_DEPRECATION_WARNINGS
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:73
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:218
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
AVSubtitle::rects
AVSubtitleRect ** rects
Definition: avcodec.h:2274
opt.h
AVCodecContext::colorspace
enum AVColorSpace colorspace
YUV colorspace type.
Definition: avcodec.h:1029
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:1064
AVCodec::priv_class
const AVClass * priv_class
AVClass for the private context.
Definition: codec.h:219
av_popcount64
#define av_popcount64
Definition: common.h:153
thread.h
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2964
ff_thread_flush
void ff_thread_flush(AVCodecContext *avctx)
Wait for decoding threads to finish and reset internal state.
Definition: pthread_frame.c:912
ff_decode_receive_frame
int ff_decode_receive_frame(struct AVCodecContext *avctx, struct AVFrame *frame)
avcodec_receive_frame() implementation for decoders.
Definition: decode.c:796
rect
Definition: f_ebur128.c:78
avcodec_string
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
Definition: avcodec.c:509
AVCodecContext::codec_descriptor
const struct AVCodecDescriptor * codec_descriptor
AVCodecDescriptor.
Definition: avcodec.h:1824
AVCodecContext::coded_side_data
AVPacketSideData * coded_side_data
Additional data associated with the entire coded stream.
Definition: avcodec.h:1915
AVSubtitleRect
Definition: avcodec.h:2241
AVSubtitle::num_rects
unsigned num_rects
Definition: avcodec.h:2273
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:100
avcodec_find_encoder
const AVCodec * avcodec_find_encoder(enum AVCodecID id)
Find a registered encoder with a matching codec ID.
Definition: allcodecs.c:970
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:340
AVCodecContext::color_trc
enum AVColorTransferCharacteristic color_trc
Color Transfer Characteristic.
Definition: avcodec.h:1022
ff_encode_preinit
int ff_encode_preinit(struct AVCodecContext *avctx)
Definition: encode.c:745
AVCodec::capabilities
int capabilities
Codec capabilities.
Definition: codec.h:206
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:1061
AVCodecInternal::frame_thread_encoder
void * frame_thread_encoder
Definition: internal.h:92
AVCodecInternal::in_frame
AVFrame * in_frame
The input frame is stored here for encoders implementing the simple encode API.
Definition: internal.h:100
encode.h
AVCOL_TRC_UNSPECIFIED
@ AVCOL_TRC_UNSPECIFIED
Definition: pixfmt.h:573
unknown_if_null
static const char * unknown_if_null(const char *str)
Definition: avcodec.c:504
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:1776
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:34
AVChannelLayout::order
enum AVChannelOrder order
Channel order used in this layout.
Definition: channel_layout.h:312
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:450
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:708
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:339
AVCodecContext::qmax
int qmax
maximum quantizer
Definition: avcodec.h:1255
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:317
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:94
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:52
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:74
av_chroma_location_name
const char * av_chroma_location_name(enum AVChromaLocation location)
Definition: pixdesc.c:3361
AV_FIELD_BT
@ AV_FIELD_BT
Bottom coded first, top displayed first.
Definition: defs.h:204
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_hwaccel_uninit
void ff_hwaccel_uninit(AVCodecContext *avctx)
Definition: decode.c:1252
ff_mutex_unlock
static int ff_mutex_unlock(AVMutex *mutex)
Definition: thread.h:187
FFCodec::priv_data_size
int priv_data_size
Definition: codec_internal.h:145
AV_FIELD_TT
@ AV_FIELD_TT
Top coded_first, top displayed first.
Definition: defs.h:201
fifo.h
bsf.h
av_color_space_name
const char * av_color_space_name(enum AVColorSpace space)
Definition: pixdesc.c:3340
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:450
AVCodecContext::ch_layout
AVChannelLayout ch_layout
Audio channel layout.
Definition: avcodec.h:2107
AVCodecContext::thread_count
int thread_count
thread count is used to decide how many independent tasks should be passed to execute()
Definition: avcodec.h:1532
get_bit_rate
static int64_t get_bit_rate(AVCodecContext *ctx)
Definition: avcodec.c:98
AVCodecContext::initial_padding
int initial_padding
Audio only.
Definition: avcodec.h:1794
AVCodecContext::refs
int refs
number of reference frames
Definition: avcodec.h:1001
AVCodecContext::flags
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:521
ff_encode_internal_alloc
struct AVCodecInternal * ff_encode_internal_alloc(void)
Definition: encode.c:865
AVChannelLayout::u
union AVChannelLayout::@332 u
Details about which channels are present in this layout.
AVCodecContext::coded_height
int coded_height
Definition: avcodec.h:636
AV_CODEC_CAP_ENCODER_FLUSH
#define AV_CODEC_CAP_ENCODER_FLUSH
This encoder can be flushed using avcodec_flush_buffers().
Definition: codec.h:166
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_FIELD_TB
@ AV_FIELD_TB
Top coded first, bottom displayed first.
Definition: defs.h:203
refstruct.h
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:413
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:88
AVFormatContext::bit_rate
int64_t bit_rate
Total stream bitrate in bit/s, 0 if not available.
Definition: avformat.h:1224
av_get_bits_per_sample
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:558
avassert.h
AVCodecContext::color_primaries
enum AVColorPrimaries color_primaries
Chromaticity coordinates of the source primaries.
Definition: avcodec.h:1015
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:102
av_cold
#define av_cold
Definition: attributes.h:90
FF_CODEC_PROPERTY_LOSSLESS
#define FF_CODEC_PROPERTY_LOSSLESS
Definition: avcodec.h:1905
ff_encode_flush_buffers
void ff_encode_flush_buffers(struct AVCodecContext *avctx)
Definition: encode.c:855
AV_FIELD_UNKNOWN
@ AV_FIELD_UNKNOWN
Definition: defs.h:199
AVMutex
#define AVMutex
Definition: thread.h:182
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:786
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
emms_c
#define emms_c()
Definition: emms.h:63
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:543
s
#define s(width, name)
Definition: cbs_vp9.c:198
AVCodecInternal::buffer_pkt
AVPacket * buffer_pkt
Temporary buffers for newly received or not yet output packets/frames.
Definition: internal.h:134
ff_decode_preinit
int ff_decode_preinit(struct AVCodecContext *avctx)
Perform decoder initialization and validation.
Definition: decode.c:1743
AVCodecInternal::pool
struct FramePool * pool
Definition: internal.h:65
bitrate
int64_t bitrate
Definition: av1_levels.c:47
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:399
unlock_avcodec
static void unlock_avcodec(const FFCodec *codec)
Definition: avcodec.c:92
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:713
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:40
AVCodecContext::bits_per_raw_sample
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:1517
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:343
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:1959
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:1284
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:548
AV_CODEC_ID_H264
@ AV_CODEC_ID_H264
Definition: codec_id.h:79
frame
static AVFrame * frame
Definition: demux_decode.c:54
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:451
FF_CODEC_PROPERTY_FILM_GRAIN
#define FF_CODEC_PROPERTY_FILM_GRAIN
Definition: avcodec.h:1907
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:3280
av_log_get_level
int av_log_get_level(void)
Get the current log level.
Definition: log.c:437
FF_MAX_EXTRADATA_SIZE
#define FF_MAX_EXTRADATA_SIZE
Maximum size in bytes of extradata.
Definition: avcodec.c:55
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:444
AVCodecContext::color_range
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:1039
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:200
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:1916
AVCodecContext::internal
struct AVCodecInternal * internal
Private context used for internal data.
Definition: avcodec.h:476
AVCodecContext::bit_rate
int64_t bit_rate
the average bitrate
Definition: avcodec.h:491
FF_PTR_ADD
#define FF_PTR_ADD(ptr, off)
Definition: internal.h:90
AVCodecContext::trailing_padding
int trailing_padding
Audio only.
Definition: avcodec.h:1951
av_color_primaries_name
const char * av_color_primaries_name(enum AVColorPrimaries primaries)
Definition: pixdesc.c:3298
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:128
AVCodecInternal::draining_done
int draining_done
Definition: internal.h:136
AVCOL_RANGE_UNSPECIFIED
@ AVCOL_RANGE_UNSPECIFIED
Definition: pixfmt.h:639
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:84
avcodec_find_decoder
const AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
Definition: allcodecs.c:975
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:106
attribute_align_arg
#define attribute_align_arg
Definition: internal.h:50
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:563
av_codec_is_decoder
int av_codec_is_decoder(const AVCodec *codec)
Definition: utils.c:86
options
const OptionDef options[]
codec_internal.h
AV_CODEC_ID_DXV
@ AV_CODEC_ID_DXV
Definition: codec_id.h:243
AVCodecInternal::bsf
struct AVBSFContext * bsf
Definition: internal.h:78
AVCodecContext::sample_fmt
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1080
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:56
AV_MUTEX_INITIALIZER
#define AV_MUTEX_INITIALIZER
Definition: thread.h:183
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:89
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:693
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:84
AV_CODEC_FLAG_PASS2
#define AV_CODEC_FLAG_PASS2
Use internal 2pass ratecontrol in second pass mode.
Definition: avcodec.h:310
encode
static void encode(AVCodecContext *ctx, AVFrame *frame, AVPacket *pkt, FILE *output)
Definition: encode_audio.c:94
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:57
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
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:186
av_packet_alloc
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
Definition: avpacket.c:63
AVCodecInternal
Definition: internal.h:52
AVCodecInternal::byte_buffer_size
unsigned int byte_buffer_size
Definition: internal.h:90
FF_THREAD_FRAME
#define FF_THREAD_FRAME
Decode more than one frame at once.
Definition: avcodec.h:1543
AVCodec::id
enum AVCodecID id
Definition: codec.h:201
av_codec_is_encoder
int av_codec_is_encoder(const AVCodec *codec)
Definition: utils.c:78
emms.h
avcodec_get_name
const char * avcodec_get_name(enum AVCodecID id)
Get the name of a codec.
Definition: utils.c:417
AVCodecContext::bits_per_coded_sample
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:1510
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:71
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:255
AVCodecContext::properties
unsigned properties
Properties of the stream that gets decoded.
Definition: avcodec.h:1904
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:542
AV_FIELD_BB
@ AV_FIELD_BB
Bottom coded first, bottom displayed first.
Definition: defs.h:202
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:77
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:1889
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:622
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:194
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:1981
AVCodecContext::chroma_sample_location
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:1046
len
int len
Definition: vorbis_enc_data.h:426
profile
int profile
Definition: mxfenc.c:2115
AVCOL_SPC_UNSPECIFIED
@ AVCOL_SPC_UNSPECIFIED
Definition: pixfmt.h:602
AVCodecContext::height
int height
Definition: avcodec.h:621
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:658
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:1940
avcodec.h
AVCodecContext::frame_num
int64_t frame_num
Frame counter, set by libavcodec.
Definition: avcodec.h:2118
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:1113
avcodec_flush_buffers
void avcodec_flush_buffers(AVCodecContext *avctx)
Reset the internal codec state / flush internal buffers.
Definition: avcodec.c:384
ff_decode_internal_alloc
struct AVCodecInternal * ff_decode_internal_alloc(void)
Definition: decode.c:1884
AVCodecContext::strict_std_compliance
int strict_std_compliance
strictly follow the standard (MPEG-4, ...).
Definition: avcodec.h:1371
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:916
ff_decode_flush_buffers
void ff_decode_flush_buffers(struct AVCodecContext *avctx)
Definition: decode.c:1867
av_bprintf
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:99
AVCodecInternal::recon_frame
AVFrame * recon_frame
When the AV_CODEC_FLAG_RECON_FRAME flag is used.
Definition: internal.h:108
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:114
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:441
AVCodecContext::active_thread_type
int active_thread_type
Which multithreading methods are in use by the codec.
Definition: avcodec.h:1551
c2
static const uint64_t c2
Definition: murmur3.c:53
channel_layout.h
avcodec_internal.h
AVCodecContext::qmin
int qmin
minimum quantizer
Definition: avcodec.h:1248
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:1596
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:640
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:1906
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:135
AVCodecInternal::draining
int draining
checks API usage: after codec draining, flush is required to resume operation
Definition: internal.h:129
FF_DISABLE_DEPRECATION_WARNINGS
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:72
AVCodecContext::coded_width
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:636
AVCodecContext::codec_type
enum AVMediaType codec_type
Definition: avcodec.h:449
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:144
AVCodecContext::codec_tag
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:466
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:468
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
codec_string
Definition: dashenc.c:208
AVCodecInternal::thread_ctx
void * thread_ctx
Definition: internal.h:67
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:621
ff_encode_receive_frame
int ff_encode_receive_frame(struct AVCodecContext *avctx, struct AVFrame *frame)
avcodec_receive_frame() implementation for encoders.
Definition: encode.c:842
imgutils.h
AVCodecContext::frame_number
attribute_deprecated int frame_number
Frame counter, set by libavcodec.
Definition: avcodec.h:1106
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:145
avcodec_descriptor_get
const AVCodecDescriptor * avcodec_descriptor_get(enum AVCodecID id)
Definition: codec_desc.c:3722
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:1897
lock_avcodec
static void lock_avcodec(const FFCodec *codec)
Definition: avcodec.c:86
codec_desc.h
av_color_transfer_name
const char * av_color_transfer_name(enum AVColorTransferCharacteristic transfer)
Definition: pixdesc.c:3319
ff_refstruct_unref
void ff_refstruct_unref(void *objp)
Decrement the reference count of the underlying object and automatically free the object if there are...
Definition: refstruct.c:116
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:822
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:2884
AV_CODEC_FLAG_PASS1
#define AV_CODEC_FLAG_PASS1
Use internal 2pass ratecontrol in first pass mode.
Definition: avcodec.h:306
av_fourcc2str
#define av_fourcc2str(fourcc)
Definition: avutil.h:358
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