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  /* AV_CODEC_CAP_CHANNEL_CONF is a decoder-only flag; so the code below
245  * in particular checks that nb_channels is set for all audio encoders. */
246  if (avctx->codec_type == AVMEDIA_TYPE_AUDIO && !avctx->ch_layout.nb_channels
247  && !(codec->capabilities & AV_CODEC_CAP_CHANNEL_CONF)) {
248  av_log(avctx, AV_LOG_ERROR, "%s requires channel layout to be set\n",
249  av_codec_is_decoder(codec) ? "Decoder" : "Encoder");
250  ret = AVERROR(EINVAL);
251  goto free_and_end;
252  }
253  if (avctx->ch_layout.nb_channels && !av_channel_layout_check(&avctx->ch_layout)) {
254  av_log(avctx, AV_LOG_ERROR, "Invalid channel layout\n");
255  ret = AVERROR(EINVAL);
256  goto free_and_end;
257  }
258  if (avctx->ch_layout.nb_channels > FF_SANE_NB_CHANNELS) {
259  av_log(avctx, AV_LOG_ERROR, "Too many channels: %d\n", avctx->ch_layout.nb_channels);
260  ret = AVERROR(EINVAL);
261  goto free_and_end;
262  }
263 
264  avctx->frame_num = 0;
265  avctx->codec_descriptor = avcodec_descriptor_get(avctx->codec_id);
266 
267  if ((avctx->codec->capabilities & AV_CODEC_CAP_EXPERIMENTAL) &&
268  avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
269  const char *codec_string = av_codec_is_encoder(codec) ? "encoder" : "decoder";
270  const AVCodec *codec2;
271  av_log(avctx, AV_LOG_ERROR,
272  "The %s '%s' is experimental but experimental codecs are not enabled, "
273  "add '-strict %d' if you want to use it.\n",
274  codec_string, codec->name, FF_COMPLIANCE_EXPERIMENTAL);
275  codec2 = av_codec_is_encoder(codec) ? avcodec_find_encoder(codec->id) : avcodec_find_decoder(codec->id);
276  if (!(codec2->capabilities & AV_CODEC_CAP_EXPERIMENTAL))
277  av_log(avctx, AV_LOG_ERROR, "Alternatively use the non experimental %s '%s'.\n",
278  codec_string, codec2->name);
279  ret = AVERROR_EXPERIMENTAL;
280  goto free_and_end;
281  }
282 
283  if (avctx->codec_type == AVMEDIA_TYPE_AUDIO &&
284  (!avctx->time_base.num || !avctx->time_base.den)) {
285  avctx->time_base.num = 1;
286  avctx->time_base.den = avctx->sample_rate;
287  }
288 
289  if (av_codec_is_encoder(avctx->codec))
290  ret = ff_encode_preinit(avctx);
291  else
292  ret = ff_decode_preinit(avctx);
293  if (ret < 0)
294  goto free_and_end;
295 
296  if (HAVE_THREADS && !avci->frame_thread_encoder) {
297  /* Frame-threaded decoders call FFCodec.init for their child contexts. */
298  lock_avcodec(codec2);
299  ret = ff_thread_init(avctx);
300  unlock_avcodec(codec2);
301  if (ret < 0) {
302  goto free_and_end;
303  }
304  }
305  if (!HAVE_THREADS && !(codec2->caps_internal & FF_CODEC_CAP_AUTO_THREADS))
306  avctx->thread_count = 1;
307 
308  if (!(avctx->active_thread_type & FF_THREAD_FRAME) ||
309  avci->frame_thread_encoder) {
310  if (codec2->init) {
311  lock_avcodec(codec2);
312  ret = codec2->init(avctx);
313  unlock_avcodec(codec2);
314  if (ret < 0) {
315  avci->needs_close = codec2->caps_internal & FF_CODEC_CAP_INIT_CLEANUP;
316  goto free_and_end;
317  }
318  }
319  avci->needs_close = 1;
320  }
321 
322  ret=0;
323 
324  if (av_codec_is_decoder(avctx->codec)) {
325  if (!avctx->bit_rate)
326  avctx->bit_rate = get_bit_rate(avctx);
327 
328  /* validate channel layout from the decoder */
329  if ((avctx->ch_layout.nb_channels && !av_channel_layout_check(&avctx->ch_layout)) ||
330  avctx->ch_layout.nb_channels > FF_SANE_NB_CHANNELS) {
331  ret = AVERROR(EINVAL);
332  goto free_and_end;
333  }
334  if (avctx->bits_per_coded_sample < 0) {
335  ret = AVERROR(EINVAL);
336  goto free_and_end;
337  }
338  }
339  if (codec->priv_class)
340  av_assert0(*(const AVClass **)avctx->priv_data == codec->priv_class);
341 
342 end:
343 
344  return ret;
345 free_and_end:
346  ff_codec_close(avctx);
347  goto end;
348 }
349 
350 void avcodec_flush_buffers(AVCodecContext *avctx)
351 {
352  AVCodecInternal *avci = avctx->internal;
353 
354  if (av_codec_is_encoder(avctx->codec)) {
355  int caps = avctx->codec->capabilities;
356 
357  if (!(caps & AV_CODEC_CAP_ENCODER_FLUSH)) {
358  // Only encoders that explicitly declare support for it can be
359  // flushed. Otherwise, this is a no-op.
360  av_log(avctx, AV_LOG_WARNING, "Ignoring attempt to flush encoder "
361  "that doesn't support it\n");
362  return;
363  }
364  ff_encode_flush_buffers(avctx);
365  } else
366  ff_decode_flush_buffers(avctx);
367 
368  avci->draining = 0;
369  avci->draining_done = 0;
370  av_frame_unref(avci->buffer_frame);
371  av_packet_unref(avci->buffer_pkt);
372 
373  if (HAVE_THREADS && avctx->active_thread_type & FF_THREAD_FRAME)
374  ff_thread_flush(avctx);
375  else if (ffcodec(avctx->codec)->flush)
376  ffcodec(avctx->codec)->flush(avctx);
377 }
378 
379 void avsubtitle_free(AVSubtitle *sub)
380 {
381  int i;
382 
383  for (i = 0; i < sub->num_rects; i++) {
384  AVSubtitleRect *const rect = sub->rects[i];
385 
386  av_freep(&rect->data[0]);
387  av_freep(&rect->data[1]);
388  av_freep(&rect->data[2]);
389  av_freep(&rect->data[3]);
390  av_freep(&rect->text);
391  av_freep(&rect->ass);
392 
393  av_freep(&sub->rects[i]);
394  }
395 
396  av_freep(&sub->rects);
397 
398  memset(sub, 0, sizeof(*sub));
399 }
400 
401 av_cold void ff_codec_close(AVCodecContext *avctx)
402 {
403  int i;
404 
405  if (!avctx)
406  return;
407 
408  if (avcodec_is_open(avctx)) {
409  AVCodecInternal *avci = avctx->internal;
410 
411  if (CONFIG_FRAME_THREAD_ENCODER &&
412  avci->frame_thread_encoder && avctx->thread_count > 1) {
413  ff_frame_thread_encoder_free(avctx);
414  }
415  if (HAVE_THREADS && avci->thread_ctx)
416  ff_thread_free(avctx);
417  if (avci->needs_close && ffcodec(avctx->codec)->close)
418  ffcodec(avctx->codec)->close(avctx);
419  avci->byte_buffer_size = 0;
420  av_freep(&avci->byte_buffer);
421  av_frame_free(&avci->buffer_frame);
422  av_packet_free(&avci->buffer_pkt);
423  av_packet_free(&avci->last_pkt_props);
424 
425  av_packet_free(&avci->in_pkt);
426  av_frame_free(&avci->in_frame);
427  av_frame_free(&avci->recon_frame);
428 
429  ff_refstruct_unref(&avci->pool);
430 
431  ff_hwaccel_uninit(avctx);
432 
433  av_bsf_free(&avci->bsf);
434 
435 #if FF_API_DROPCHANGED
436  av_channel_layout_uninit(&avci->initial_ch_layout);
437 #endif
438 
439 #if CONFIG_LCMS2
440  ff_icc_context_uninit(&avci->icc);
441 #endif
442 
443  av_freep(&avctx->internal);
444  }
445 
446  for (i = 0; i < avctx->nb_coded_side_data; i++)
447  av_freep(&avctx->coded_side_data[i].data);
448  av_freep(&avctx->coded_side_data);
449  avctx->nb_coded_side_data = 0;
450 
451  av_buffer_unref(&avctx->hw_frames_ctx);
452  av_buffer_unref(&avctx->hw_device_ctx);
453 
454  if (avctx->priv_data && avctx->codec && avctx->codec->priv_class)
455  av_opt_free(avctx->priv_data);
456  av_opt_free(avctx);
457  av_freep(&avctx->priv_data);
458  if (av_codec_is_encoder(avctx->codec)) {
459  av_freep(&avctx->extradata);
460  avctx->extradata_size = 0;
461  } else if (av_codec_is_decoder(avctx->codec))
462  av_freep(&avctx->subtitle_header);
463 
464  avctx->codec = NULL;
465  avctx->active_thread_type = 0;
466 }
467 
468 #if FF_API_AVCODEC_CLOSE
469 int avcodec_close(AVCodecContext *avctx)
470 {
471  ff_codec_close(avctx);
472  return 0;
473 }
474 #endif
475 
476 static const char *unknown_if_null(const char *str)
477 {
478  return str ? str : "unknown";
479 }
480 
481 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
482 {
483  const char *codec_type;
484  const char *codec_name;
485  const char *profile = NULL;
486  AVBPrint bprint;
487  int64_t bitrate;
488  int new_line = 0;
489  AVRational display_aspect_ratio;
490  const char *separator = enc->dump_separator ? (const char *)enc->dump_separator : ", ";
491  const char *str;
492 
493  if (!buf || buf_size <= 0)
494  return;
495  av_bprint_init_for_buffer(&bprint, buf, buf_size);
496  codec_type = av_get_media_type_string(enc->codec_type);
497  codec_name = avcodec_get_name(enc->codec_id);
498  profile = avcodec_profile_name(enc->codec_id, enc->profile);
499 
500  av_bprintf(&bprint, "%s: %s", codec_type ? codec_type : "unknown",
501  codec_name);
502  buf[0] ^= 'a' ^ 'A'; /* first letter in uppercase */
503 
504  if (enc->codec && strcmp(enc->codec->name, codec_name))
505  av_bprintf(&bprint, " (%s)", enc->codec->name);
506 
507  if (profile)
508  av_bprintf(&bprint, " (%s)", profile);
509  if ( enc->codec_type == AVMEDIA_TYPE_VIDEO
510  && av_log_get_level() >= AV_LOG_VERBOSE
511  && enc->refs)
512  av_bprintf(&bprint, ", %d reference frame%s",
513  enc->refs, enc->refs > 1 ? "s" : "");
514 
515  if (enc->codec_tag)
516  av_bprintf(&bprint, " (%s / 0x%04X)",
517  av_fourcc2str(enc->codec_tag), enc->codec_tag);
518 
519  switch (enc->codec_type) {
520  case AVMEDIA_TYPE_VIDEO:
521  {
522  unsigned len;
523 
524  av_bprintf(&bprint, "%s%s", separator,
525  enc->pix_fmt == AV_PIX_FMT_NONE ? "none" :
526  unknown_if_null(av_get_pix_fmt_name(enc->pix_fmt)));
527 
528  av_bprint_chars(&bprint, '(', 1);
529  len = bprint.len;
530 
531  /* The following check ensures that '(' has been written
532  * and therefore allows us to erase it if it turns out
533  * to be unnecessary. */
534  if (!av_bprint_is_complete(&bprint))
535  return;
536 
537  if (enc->bits_per_raw_sample && enc->pix_fmt != AV_PIX_FMT_NONE &&
538  enc->bits_per_raw_sample < av_pix_fmt_desc_get(enc->pix_fmt)->comp[0].depth)
539  av_bprintf(&bprint, "%d bpc, ", enc->bits_per_raw_sample);
540  if (enc->color_range != AVCOL_RANGE_UNSPECIFIED &&
541  (str = av_color_range_name(enc->color_range)))
542  av_bprintf(&bprint, "%s, ", str);
543 
544  if (enc->colorspace != AVCOL_SPC_UNSPECIFIED ||
545  enc->color_primaries != AVCOL_PRI_UNSPECIFIED ||
546  enc->color_trc != AVCOL_TRC_UNSPECIFIED) {
547  const char *col = unknown_if_null(av_color_space_name(enc->colorspace));
548  const char *pri = unknown_if_null(av_color_primaries_name(enc->color_primaries));
549  const char *trc = unknown_if_null(av_color_transfer_name(enc->color_trc));
550  if (strcmp(col, pri) || strcmp(col, trc)) {
551  new_line = 1;
552  av_bprintf(&bprint, "%s/%s/%s, ", col, pri, trc);
553  } else
554  av_bprintf(&bprint, "%s, ", col);
555  }
556 
557  if (enc->field_order != AV_FIELD_UNKNOWN) {
558  const char *field_order = "progressive";
559  if (enc->field_order == AV_FIELD_TT)
560  field_order = "top first";
561  else if (enc->field_order == AV_FIELD_BB)
562  field_order = "bottom first";
563  else if (enc->field_order == AV_FIELD_TB)
564  field_order = "top coded first (swapped)";
565  else if (enc->field_order == AV_FIELD_BT)
566  field_order = "bottom coded first (swapped)";
567 
568  av_bprintf(&bprint, "%s, ", field_order);
569  }
570 
571  if (av_log_get_level() >= AV_LOG_VERBOSE &&
572  enc->chroma_sample_location != AVCHROMA_LOC_UNSPECIFIED &&
573  (str = av_chroma_location_name(enc->chroma_sample_location)))
574  av_bprintf(&bprint, "%s, ", str);
575 
576  if (len == bprint.len) {
577  bprint.str[len - 1] = '\0';
578  bprint.len--;
579  } else {
580  if (bprint.len - 2 < bprint.size) {
581  /* Erase the last ", " */
582  bprint.len -= 2;
583  bprint.str[bprint.len] = '\0';
584  }
585  av_bprint_chars(&bprint, ')', 1);
586  }
587  }
588 
589  if (enc->width) {
590  av_bprintf(&bprint, "%s%dx%d", new_line ? separator : ", ",
591  enc->width, enc->height);
592 
593  if (av_log_get_level() >= AV_LOG_VERBOSE &&
594  enc->coded_width && enc->coded_height &&
595  (enc->width != enc->coded_width ||
596  enc->height != enc->coded_height))
597  av_bprintf(&bprint, " (%dx%d)",
598  enc->coded_width, enc->coded_height);
599 
600  if (enc->sample_aspect_ratio.num) {
601  av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den,
602  enc->width * (int64_t)enc->sample_aspect_ratio.num,
603  enc->height * (int64_t)enc->sample_aspect_ratio.den,
604  1024 * 1024);
605  av_bprintf(&bprint, " [SAR %d:%d DAR %d:%d]",
606  enc->sample_aspect_ratio.num, enc->sample_aspect_ratio.den,
607  display_aspect_ratio.num, display_aspect_ratio.den);
608  }
609  if (av_log_get_level() >= AV_LOG_DEBUG) {
610  int g = av_gcd(enc->time_base.num, enc->time_base.den);
611  av_bprintf(&bprint, ", %d/%d",
612  enc->time_base.num / g, enc->time_base.den / g);
613  }
614  }
615  if (encode) {
616  av_bprintf(&bprint, ", q=%d-%d", enc->qmin, enc->qmax);
617  } else {
618  if (enc->properties & FF_CODEC_PROPERTY_CLOSED_CAPTIONS)
619  av_bprintf(&bprint, ", Closed Captions");
620  if (enc->properties & FF_CODEC_PROPERTY_FILM_GRAIN)
621  av_bprintf(&bprint, ", Film Grain");
622  if (enc->properties & FF_CODEC_PROPERTY_LOSSLESS)
623  av_bprintf(&bprint, ", lossless");
624  }
625  break;
626  case AVMEDIA_TYPE_AUDIO:
627  av_bprintf(&bprint, "%s", separator);
628 
629  if (enc->sample_rate) {
630  av_bprintf(&bprint, "%d Hz, ", enc->sample_rate);
631  }
632  av_channel_layout_describe_bprint(&enc->ch_layout, &bprint);
633  if (enc->sample_fmt != AV_SAMPLE_FMT_NONE &&
634  (str = av_get_sample_fmt_name(enc->sample_fmt))) {
635  av_bprintf(&bprint, ", %s", str);
636  }
637  if ( enc->bits_per_raw_sample > 0
638  && enc->bits_per_raw_sample != av_get_bytes_per_sample(enc->sample_fmt) * 8)
639  av_bprintf(&bprint, " (%d bit)", enc->bits_per_raw_sample);
640  if (av_log_get_level() >= AV_LOG_VERBOSE) {
641  if (enc->initial_padding)
642  av_bprintf(&bprint, ", delay %d", enc->initial_padding);
643  if (enc->trailing_padding)
644  av_bprintf(&bprint, ", padding %d", enc->trailing_padding);
645  }
646  break;
647  case AVMEDIA_TYPE_DATA:
648  if (av_log_get_level() >= AV_LOG_DEBUG) {
649  int g = av_gcd(enc->time_base.num, enc->time_base.den);
650  if (g)
651  av_bprintf(&bprint, ", %d/%d",
652  enc->time_base.num / g, enc->time_base.den / g);
653  }
654  break;
655  case AVMEDIA_TYPE_SUBTITLE:
656  if (enc->width)
657  av_bprintf(&bprint, ", %dx%d", enc->width, enc->height);
658  break;
659  default:
660  return;
661  }
662  if (encode) {
663  if (enc->flags & AV_CODEC_FLAG_PASS1)
664  av_bprintf(&bprint, ", pass 1");
665  if (enc->flags & AV_CODEC_FLAG_PASS2)
666  av_bprintf(&bprint, ", pass 2");
667  }
668  bitrate = get_bit_rate(enc);
669  if (bitrate != 0) {
670  av_bprintf(&bprint, ", %"PRId64" kb/s", bitrate / 1000);
671  } else if (enc->rc_max_rate > 0) {
672  av_bprintf(&bprint, ", max. %"PRId64" kb/s", enc->rc_max_rate / 1000);
673  }
674 }
675 
676 int avcodec_is_open(AVCodecContext *s)
677 {
678  return !!s->internal;
679 }
680 
681 int attribute_align_arg avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
682 {
683  av_frame_unref(frame);
684 
685  if (av_codec_is_decoder(avctx->codec))
686  return ff_decode_receive_frame(avctx, frame);
687  return ff_encode_receive_frame(avctx, frame);
688 }
AVSubtitle
Definition: avcodec.h:2227
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:427
AVCodec
AVCodec.
Definition: codec.h:187
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
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:1638
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:2232
opt.h
AVCodecContext::colorspace
enum AVColorSpace colorspace
YUV colorspace type.
Definition: avcodec.h:685
AVCodecContext::sample_rate
int sample_rate
samples per second
Definition: avcodec.h:1050
AVCodec::priv_class
const AVClass * priv_class
AVClass for the private context.
Definition: codec.h:212
thread.h
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2962
ff_thread_flush
void ff_thread_flush(AVCodecContext *avctx)
Wait for decoding threads to finish and reset internal state.
Definition: pthread_frame.c:896
ff_decode_receive_frame
int ff_decode_receive_frame(struct AVCodecContext *avctx, struct AVFrame *frame)
avcodec_receive_frame() implementation for decoders.
Definition: decode.c:761
rect
Definition: f_ebur128.c:78
avcodec_string
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
Definition: avcodec.c:481
AVCodecContext::codec_descriptor
const struct AVCodecDescriptor * codec_descriptor
AVCodecDescriptor.
Definition: avcodec.h:1861
AVCodecContext::coded_side_data
AVPacketSideData * coded_side_data
Additional data associated with the entire coded stream.
Definition: avcodec.h:1915
AVSubtitleRect
Definition: avcodec.h:2200
AVSubtitle::num_rects
unsigned num_rects
Definition: avcodec.h:2231
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:130
avcodec_find_encoder
const AVCodec * avcodec_find_encoder(enum AVCodecID id)
Find a registered encoder with a matching codec ID.
Definition: allcodecs.c:966
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:344
AVCodecContext::color_trc
enum AVColorTransferCharacteristic color_trc
Color Transfer Characteristic.
Definition: avcodec.h:678
ff_encode_preinit
int ff_encode_preinit(struct AVCodecContext *avctx)
Definition: encode.c:731
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:708
AVCodecInternal::frame_thread_encoder
void * frame_thread_encoder
Definition: internal.h:89
AVCodecInternal::in_frame
AVFrame * in_frame
The input frame is stored here for encoders implementing the simple encode API.
Definition: internal.h:97
encode.h
AVCOL_TRC_UNSPECIFIED
@ AVCOL_TRC_UNSPECIFIED
Definition: pixfmt.h:583
unknown_if_null
static const char * unknown_if_null(const char *str)
Definition: avcodec.c:476
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
Definition: avcodec.h:1891
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
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:439
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:676
AVCodecContext::qmax
int qmax
maximum quantizer
Definition: avcodec.h:1263
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:313
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:3359
av_channel_layout_describe_bprint
int av_channel_layout_describe_bprint(const AVChannelLayout *channel_layout, AVBPrint *bp)
bprint variant of av_channel_layout_describe().
Definition: channel_layout.c:590
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:1207
ff_mutex_unlock
static int ff_mutex_unlock(AVMutex *mutex)
Definition: thread.h:189
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:3338
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:454
AVCodecContext::ch_layout
AVChannelLayout ch_layout
Audio channel layout.
Definition: avcodec.h:1065
AVCodecContext::thread_count
int thread_count
thread count is used to decide how many independent tasks should be passed to execute()
Definition: avcodec.h:1582
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:1122
AVCodecContext::refs
int refs
number of reference frames
Definition: avcodec.h:715
av_opt_free
void av_opt_free(void *obj)
Free all allocated objects in obj.
Definition: opt.c:1908
AVCodecContext::flags
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:502
ff_encode_internal_alloc
struct AVCodecInternal * ff_encode_internal_alloc(void)
Definition: encode.c:851
AVCodecContext::coded_height
int coded_height
Definition: avcodec.h:633
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:379
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:118
AVFormatContext::bit_rate
int64_t bit_rate
Total stream bitrate in bit/s, 0 if not available.
Definition: avformat.h:1397
av_get_bits_per_sample
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:547
avassert.h
AVCodecContext::color_primaries
enum AVColorPrimaries color_primaries
Chromaticity coordinates of the source primaries.
Definition: avcodec.h:671
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:1796
ff_encode_flush_buffers
void ff_encode_flush_buffers(struct AVCodecContext *avctx)
Definition: encode.c:841
AV_FIELD_UNKNOWN
@ AV_FIELD_UNKNOWN
Definition: defs.h:199
AVMutex
#define AVMutex
Definition: thread.h:184
emms_c
#define emms_c()
Definition: emms.h:63
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:524
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:131
ff_decode_preinit
int ff_decode_preinit(struct AVCodecContext *avctx)
Perform decoder initialization and validation.
Definition: decode.c:1685
AVCodecInternal::pool
struct FramePool * pool
Definition: internal.h:62
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
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:681
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:40
avcodec_close
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:469
AVCodecContext::bits_per_raw_sample
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:1574
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:374
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:1934
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:1292
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:558
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:455
FF_CODEC_PROPERTY_FILM_GRAIN
#define FF_CODEC_PROPERTY_FILM_GRAIN
Definition: avcodec.h:1798
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:3278
av_log_get_level
int av_log_get_level(void)
Get the current log level.
Definition: log.c:442
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:695
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:480
AVCodecContext::bit_rate
int64_t bit_rate
the average bitrate
Definition: avcodec.h:495
FF_PTR_ADD
#define FF_PTR_ADD(ptr, off)
Definition: internal.h:90
AVCodecContext::trailing_padding
int trailing_padding
Audio only.
Definition: avcodec.h:1133
av_color_primaries_name
const char * av_color_primaries_name(enum AVColorPrimaries primaries)
Definition: pixdesc.c:3296
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:133
AVCOL_RANGE_UNSPECIFIED
@ AVCOL_RANGE_UNSPECIFIED
Definition: pixfmt.h:649
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:81
avcodec_find_decoder
const AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
Definition: allcodecs.c:971
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:544
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:75
AVCodecContext::sample_fmt
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1057
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:56
AV_MUTEX_INITIALIZER
#define AV_MUTEX_INITIALIZER
Definition: thread.h:185
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:86
ffcodec
static const av_always_inline FFCodec * ffcodec(const AVCodec *codec)
Definition: codec_internal.h:306
AVCHROMA_LOC_UNSPECIFIED
@ AVCHROMA_LOC_UNSPECIFIED
Definition: pixfmt.h:703
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:314
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
ff_mutex_lock
static int ff_mutex_lock(AVMutex *mutex)
Definition: thread.h:188
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:49
AVCodecInternal::byte_buffer_size
unsigned int byte_buffer_size
Definition: internal.h:87
FF_THREAD_FRAME
#define FF_THREAD_FRAME
Decode more than one frame at once.
Definition: avcodec.h:1593
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:406
AVCodecContext::bits_per_coded_sample
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:1567
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:1795
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:523
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:74
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:1899
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:576
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:1497
AVCodecContext::chroma_sample_location
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:702
len
int len
Definition: vorbis_enc_data.h:426
profile
int profile
Definition: mxfenc.c:2226
AVCOL_SPC_UNSPECIFIED
@ AVCOL_SPC_UNSPECIFIED
Definition: pixfmt.h:612
AVCodecContext::height
int height
Definition: avcodec.h:618
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:657
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:1475
avcodec.h
AVCodecContext::frame_num
int64_t frame_num
Frame counter, set by libavcodec.
Definition: avcodec.h:2030
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:1083
avcodec_flush_buffers
void avcodec_flush_buffers(AVCodecContext *avctx)
Reset the internal codec state / flush internal buffers.
Definition: avcodec.c:350
ff_decode_internal_alloc
struct AVCodecInternal * ff_decode_internal_alloc(void)
Definition: decode.c:1946
AVCodecContext::strict_std_compliance
int strict_std_compliance
strictly follow the standard (MPEG-4, ...).
Definition: avcodec.h:1379
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:774
ff_decode_flush_buffers
void ff_decode_flush_buffers(struct AVCodecContext *avctx)
Definition: decode.c:1929
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:105
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:111
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:445
AVCodecContext::active_thread_type
int active_thread_type
Which multithreading methods are in use by the codec.
Definition: avcodec.h:1601
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:1256
AVRational::den
int den
Denominator.
Definition: rational.h:60
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:72
AVCodecContext::profile
int profile
profile
Definition: avcodec.h:1639
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:432
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:1797
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:242
AVCodecInternal::buffer_frame
AVFrame * buffer_frame
Definition: internal.h:132
AVCodecInternal::draining
int draining
checks API usage: after codec draining, flush is required to resume operation
Definition: internal.h:126
AVCodecContext::coded_width
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:633
AVCodecContext::codec_type
enum AVMediaType codec_type
Definition: avcodec.h:453
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:141
ff_codec_close
av_cold void ff_codec_close(AVCodecContext *avctx)
Definition: avcodec.c:401
AVCodecContext::codec_tag
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:470
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:472
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:64
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:618
ff_encode_receive_frame
int ff_encode_receive_frame(struct AVCodecContext *avctx, struct AVFrame *frame)
avcodec_receive_frame() implementation for encoders.
Definition: encode.c:828
imgutils.h
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:3727
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:1945
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:37
AVCodecContext::codec_whitelist
char * codec_whitelist
',' separated list of allowed decoders.
Definition: avcodec.h:1907
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:3317
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:120
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:642
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:2882
AV_CODEC_FLAG_PASS1
#define AV_CODEC_FLAG_PASS1
Use internal 2pass ratecontrol in first pass mode.
Definition: avcodec.h:310
av_fourcc2str
#define av_fourcc2str(fourcc)
Definition: avutil.h:345
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