FFmpeg  4.3
pthread_frame.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 /**
20  * @file
21  * Frame multithreading support functions
22  * @see doc/multithreading.txt
23  */
24 
25 #include "config.h"
26 
27 #include <stdatomic.h>
28 #include <stdint.h>
29 
30 #include "avcodec.h"
31 #include "hwconfig.h"
32 #include "internal.h"
33 #include "pthread_internal.h"
34 #include "thread.h"
35 #include "version.h"
36 
37 #include "libavutil/avassert.h"
38 #include "libavutil/buffer.h"
39 #include "libavutil/common.h"
40 #include "libavutil/cpu.h"
41 #include "libavutil/frame.h"
42 #include "libavutil/internal.h"
43 #include "libavutil/log.h"
44 #include "libavutil/mem.h"
45 #include "libavutil/opt.h"
46 #include "libavutil/thread.h"
47 
48 enum {
49  ///< Set when the thread is awaiting a packet.
51  ///< Set before the codec has called ff_thread_finish_setup().
53  /**
54  * Set when the codec calls get_buffer().
55  * State is returned to STATE_SETTING_UP afterwards.
56  */
58  /**
59  * Set when the codec calls get_format().
60  * State is returned to STATE_SETTING_UP afterwards.
61  */
63  ///< Set after the codec has called ff_thread_finish_setup().
65 };
66 
67 /**
68  * Context used by codec threads and stored in their AVCodecInternal thread_ctx.
69  */
70 typedef struct PerThreadContext {
72 
75  pthread_cond_t input_cond; ///< Used to wait for a new packet from the main thread.
76  pthread_cond_t progress_cond; ///< Used by child threads to wait for progress to change.
77  pthread_cond_t output_cond; ///< Used by the main thread to wait for frames to finish.
78 
79  pthread_mutex_t mutex; ///< Mutex used to protect the contents of the PerThreadContext.
80  pthread_mutex_t progress_mutex; ///< Mutex used to protect frame progress values and progress_cond.
81 
82  AVCodecContext *avctx; ///< Context used to decode packets passed to this thread.
83 
84  AVPacket avpkt; ///< Input packet (for decoding) or output (for encoding).
85 
86  AVFrame *frame; ///< Output frame (for decoding) or input (for encoding).
87  int got_frame; ///< The output of got_picture_ptr from the last avcodec_decode_video() call.
88  int result; ///< The result of the last codec decode/encode() call.
89 
91 
92  /**
93  * Array of frames passed to ff_thread_release_buffer().
94  * Frames are released after all threads referencing them are finished.
95  */
99 
100  AVFrame *requested_frame; ///< AVFrame the codec passed to get_buffer()
101  int requested_flags; ///< flags passed to get_buffer() for requested_frame
102 
103  const enum AVPixelFormat *available_formats; ///< Format array for get_format()
104  enum AVPixelFormat result_format; ///< get_format() result
105 
106  int die; ///< Set when the thread should exit.
107 
110 
111  atomic_int debug_threads; ///< Set if the FF_DEBUG_THREADS option is set.
113 
114 /**
115  * Context stored in the client AVCodecInternal thread_ctx.
116  */
117 typedef struct FrameThreadContext {
118  PerThreadContext *threads; ///< The contexts for each thread.
119  PerThreadContext *prev_thread; ///< The last thread submit_packet() was called on.
120 
121  pthread_mutex_t buffer_mutex; ///< Mutex used to protect get/release_buffer().
122  /**
123  * This lock is used for ensuring threads run in serial when hwaccel
124  * is used.
125  */
130 
131  int next_decoding; ///< The next context to submit a packet to.
132  int next_finished; ///< The next context to return output from.
133 
134  int delaying; /**<
135  * Set for the first N packets, where N is the number of threads.
136  * While it is set, ff_thread_en/decode_frame won't return any results.
137  */
139 
140 #define THREAD_SAFE_CALLBACKS(avctx) \
141 ((avctx)->thread_safe_callbacks || (avctx)->get_buffer2 == avcodec_default_get_buffer2)
142 
143 static void async_lock(FrameThreadContext *fctx)
144 {
146  while (fctx->async_lock)
147  pthread_cond_wait(&fctx->async_cond, &fctx->async_mutex);
148  fctx->async_lock = 1;
150 }
151 
153 {
155  av_assert0(fctx->async_lock);
156  fctx->async_lock = 0;
159 }
160 
161 /**
162  * Codec worker thread.
163  *
164  * Automatically calls ff_thread_finish_setup() if the codec does
165  * not provide an update_thread_context method, or if the codec returns
166  * before calling it.
167  */
169 {
170  PerThreadContext *p = arg;
171  AVCodecContext *avctx = p->avctx;
172  const AVCodec *codec = avctx->codec;
173 
175  while (1) {
176  while (atomic_load(&p->state) == STATE_INPUT_READY && !p->die)
178 
179  if (p->die) break;
180 
181  if (!codec->update_thread_context && THREAD_SAFE_CALLBACKS(avctx))
182  ff_thread_finish_setup(avctx);
183 
184  /* If a decoder supports hwaccel, then it must call ff_get_format().
185  * Since that call must happen before ff_thread_finish_setup(), the
186  * decoder is required to implement update_thread_context() and call
187  * ff_thread_finish_setup() manually. Therefore the above
188  * ff_thread_finish_setup() call did not happen and hwaccel_serializing
189  * cannot be true here. */
191 
192  /* if the previous thread uses hwaccel then we take the lock to ensure
193  * the threads don't run concurrently */
194  if (avctx->hwaccel) {
196  p->hwaccel_serializing = 1;
197  }
198 
199  av_frame_unref(p->frame);
200  p->got_frame = 0;
201  p->result = codec->decode(avctx, p->frame, &p->got_frame, &p->avpkt);
202 
203  if ((p->result < 0 || !p->got_frame) && p->frame->buf[0]) {
205  av_log(avctx, AV_LOG_ERROR, "A frame threaded decoder did not "
206  "free the frame on failure. This is a bug, please report it.\n");
207  av_frame_unref(p->frame);
208  }
209 
210  if (atomic_load(&p->state) == STATE_SETTING_UP)
211  ff_thread_finish_setup(avctx);
212 
213  if (p->hwaccel_serializing) {
214  p->hwaccel_serializing = 0;
216  }
217 
218  if (p->async_serializing) {
219  p->async_serializing = 0;
220 
221  async_unlock(p->parent);
222  }
223 
225 
227 
231  }
233 
234  return NULL;
235 }
236 
237 /**
238  * Update the next thread's AVCodecContext with values from the reference thread's context.
239  *
240  * @param dst The destination context.
241  * @param src The source context.
242  * @param for_user 0 if the destination is a codec thread, 1 if the destination is the user's thread
243  * @return 0 on success, negative error code on failure
244  */
246 {
247  int err = 0;
248 
249  if (dst != src && (for_user || !(src->codec_descriptor->props & AV_CODEC_PROP_INTRA_ONLY))) {
250  dst->time_base = src->time_base;
251  dst->framerate = src->framerate;
252  dst->width = src->width;
253  dst->height = src->height;
254  dst->pix_fmt = src->pix_fmt;
255  dst->sw_pix_fmt = src->sw_pix_fmt;
256 
257  dst->coded_width = src->coded_width;
258  dst->coded_height = src->coded_height;
259 
260  dst->has_b_frames = src->has_b_frames;
261  dst->idct_algo = src->idct_algo;
262 
265 
266  dst->profile = src->profile;
267  dst->level = src->level;
268 
270  dst->ticks_per_frame = src->ticks_per_frame;
271  dst->color_primaries = src->color_primaries;
272 
273  dst->color_trc = src->color_trc;
274  dst->colorspace = src->colorspace;
275  dst->color_range = src->color_range;
277 
278  dst->hwaccel = src->hwaccel;
279  dst->hwaccel_context = src->hwaccel_context;
280 
281  dst->channels = src->channels;
282  dst->sample_rate = src->sample_rate;
283  dst->sample_fmt = src->sample_fmt;
284  dst->channel_layout = src->channel_layout;
286 
287  if (!!dst->hw_frames_ctx != !!src->hw_frames_ctx ||
288  (dst->hw_frames_ctx && dst->hw_frames_ctx->data != src->hw_frames_ctx->data)) {
290 
291  if (src->hw_frames_ctx) {
293  if (!dst->hw_frames_ctx)
294  return AVERROR(ENOMEM);
295  }
296  }
297 
298  dst->hwaccel_flags = src->hwaccel_flags;
299 
300  if (!!dst->internal->pool != !!src->internal->pool ||
301  (dst->internal->pool && dst->internal->pool->data != src->internal->pool->data)) {
302  av_buffer_unref(&dst->internal->pool);
303 
304  if (src->internal->pool) {
305  dst->internal->pool = av_buffer_ref(src->internal->pool);
306  if (!dst->internal->pool)
307  return AVERROR(ENOMEM);
308  }
309  }
310  }
311 
312  if (for_user) {
313 #if FF_API_CODED_FRAME
315  dst->coded_frame = src->coded_frame;
317 #endif
318  } else {
319  if (dst->codec->update_thread_context)
320  err = dst->codec->update_thread_context(dst, src);
321  }
322 
323  return err;
324 }
325 
326 /**
327  * Update the next thread's AVCodecContext with values set by the user.
328  *
329  * @param dst The destination context.
330  * @param src The source context.
331  * @return 0 on success, negative error code on failure
332  */
334 {
335  dst->flags = src->flags;
336 
337  dst->draw_horiz_band= src->draw_horiz_band;
338  dst->get_buffer2 = src->get_buffer2;
339 
340  dst->opaque = src->opaque;
341  dst->debug = src->debug;
342  dst->debug_mv = src->debug_mv;
343 
344  dst->slice_flags = src->slice_flags;
345  dst->flags2 = src->flags2;
347 
349  dst->skip_idct = src->skip_idct;
350  dst->skip_frame = src->skip_frame;
351 
352  dst->frame_number = src->frame_number;
355 
356  if (src->slice_count && src->slice_offset) {
357  if (dst->slice_count < src->slice_count) {
358  int err = av_reallocp_array(&dst->slice_offset, src->slice_count,
359  sizeof(*dst->slice_offset));
360  if (err < 0)
361  return err;
362  }
363  memcpy(dst->slice_offset, src->slice_offset,
364  src->slice_count * sizeof(*dst->slice_offset));
365  }
366  dst->slice_count = src->slice_count;
367  return 0;
368 }
369 
370 /// Releases the buffers that this decoding thread was the last user of.
372 {
373  FrameThreadContext *fctx = p->parent;
374 
375  while (p->num_released_buffers > 0) {
376  AVFrame *f;
377 
379 
380  // fix extended data in case the caller screwed it up
384  f->extended_data = f->data;
385  av_frame_unref(f);
386 
388  }
389 }
390 
391 static int submit_packet(PerThreadContext *p, AVCodecContext *user_avctx,
392  AVPacket *avpkt)
393 {
394  FrameThreadContext *fctx = p->parent;
395  PerThreadContext *prev_thread = fctx->prev_thread;
396  const AVCodec *codec = p->avctx->codec;
397  int ret;
398 
399  if (!avpkt->size && !(codec->capabilities & AV_CODEC_CAP_DELAY))
400  return 0;
401 
403 
404  ret = update_context_from_user(p->avctx, user_avctx);
405  if (ret) {
407  return ret;
408  }
410  (p->avctx->debug & FF_DEBUG_THREADS) != 0,
411  memory_order_relaxed);
412 
414 
415  if (prev_thread) {
416  int err;
417  if (atomic_load(&prev_thread->state) == STATE_SETTING_UP) {
418  pthread_mutex_lock(&prev_thread->progress_mutex);
419  while (atomic_load(&prev_thread->state) == STATE_SETTING_UP)
420  pthread_cond_wait(&prev_thread->progress_cond, &prev_thread->progress_mutex);
421  pthread_mutex_unlock(&prev_thread->progress_mutex);
422  }
423 
424  err = update_context_from_thread(p->avctx, prev_thread->avctx, 0);
425  if (err) {
427  return err;
428  }
429  }
430 
431  av_packet_unref(&p->avpkt);
432  ret = av_packet_ref(&p->avpkt, avpkt);
433  if (ret < 0) {
435  av_log(p->avctx, AV_LOG_ERROR, "av_packet_ref() failed in submit_packet()\n");
436  return ret;
437  }
438 
442 
443  /*
444  * If the client doesn't have a thread-safe get_buffer(),
445  * then decoding threads call back to the main thread,
446  * and it calls back to the client here.
447  */
448 
449  if (!p->avctx->thread_safe_callbacks && (
453  int call_done = 1;
455  while (atomic_load(&p->state) == STATE_SETTING_UP)
457 
458  switch (atomic_load_explicit(&p->state, memory_order_acquire)) {
459  case STATE_GET_BUFFER:
461  break;
462  case STATE_GET_FORMAT:
464  break;
465  default:
466  call_done = 0;
467  break;
468  }
469  if (call_done) {
472  }
474  }
475  }
476 
477  fctx->prev_thread = p;
478  fctx->next_decoding++;
479 
480  return 0;
481 }
482 
484  AVFrame *picture, int *got_picture_ptr,
485  AVPacket *avpkt)
486 {
487  FrameThreadContext *fctx = avctx->internal->thread_ctx;
488  int finished = fctx->next_finished;
489  PerThreadContext *p;
490  int err;
491 
492  /* release the async lock, permitting blocked hwaccel threads to
493  * go forward while we are in this function */
494  async_unlock(fctx);
495 
496  /*
497  * Submit a packet to the next decoding thread.
498  */
499 
500  p = &fctx->threads[fctx->next_decoding];
501  err = submit_packet(p, avctx, avpkt);
502  if (err)
503  goto finish;
504 
505  /*
506  * If we're still receiving the initial packets, don't return a frame.
507  */
508 
509  if (fctx->next_decoding > (avctx->thread_count-1-(avctx->codec_id == AV_CODEC_ID_FFV1)))
510  fctx->delaying = 0;
511 
512  if (fctx->delaying) {
513  *got_picture_ptr=0;
514  if (avpkt->size) {
515  err = avpkt->size;
516  goto finish;
517  }
518  }
519 
520  /*
521  * Return the next available frame from the oldest thread.
522  * If we're at the end of the stream, then we have to skip threads that
523  * didn't output a frame/error, because we don't want to accidentally signal
524  * EOF (avpkt->size == 0 && *got_picture_ptr == 0 && err >= 0).
525  */
526 
527  do {
528  p = &fctx->threads[finished++];
529 
530  if (atomic_load(&p->state) != STATE_INPUT_READY) {
532  while (atomic_load_explicit(&p->state, memory_order_relaxed) != STATE_INPUT_READY)
535  }
536 
537  av_frame_move_ref(picture, p->frame);
538  *got_picture_ptr = p->got_frame;
539  picture->pkt_dts = p->avpkt.dts;
540  err = p->result;
541 
542  /*
543  * A later call with avkpt->size == 0 may loop over all threads,
544  * including this one, searching for a frame/error to return before being
545  * stopped by the "finished != fctx->next_finished" condition.
546  * Make sure we don't mistakenly return the same frame/error again.
547  */
548  p->got_frame = 0;
549  p->result = 0;
550 
551  if (finished >= avctx->thread_count) finished = 0;
552  } while (!avpkt->size && !*got_picture_ptr && err >= 0 && finished != fctx->next_finished);
553 
554  update_context_from_thread(avctx, p->avctx, 1);
555 
556  if (fctx->next_decoding >= avctx->thread_count) fctx->next_decoding = 0;
557 
558  fctx->next_finished = finished;
559 
560  /* return the size of the consumed packet if no error occurred */
561  if (err >= 0)
562  err = avpkt->size;
563 finish:
564  async_lock(fctx);
565  return err;
566 }
567 
568 void ff_thread_report_progress(ThreadFrame *f, int n, int field)
569 {
570  PerThreadContext *p;
571  atomic_int *progress = f->progress ? (atomic_int*)f->progress->data : NULL;
572 
573  if (!progress ||
574  atomic_load_explicit(&progress[field], memory_order_relaxed) >= n)
575  return;
576 
577  p = f->owner[field]->internal->thread_ctx;
578 
579  if (atomic_load_explicit(&p->debug_threads, memory_order_relaxed))
580  av_log(f->owner[field], AV_LOG_DEBUG,
581  "%p finished %d field %d\n", progress, n, field);
582 
584 
585  atomic_store_explicit(&progress[field], n, memory_order_release);
586 
589 }
590 
591 void ff_thread_await_progress(ThreadFrame *f, int n, int field)
592 {
593  PerThreadContext *p;
594  atomic_int *progress = f->progress ? (atomic_int*)f->progress->data : NULL;
595 
596  if (!progress ||
597  atomic_load_explicit(&progress[field], memory_order_acquire) >= n)
598  return;
599 
600  p = f->owner[field]->internal->thread_ctx;
601 
602  if (atomic_load_explicit(&p->debug_threads, memory_order_relaxed))
603  av_log(f->owner[field], AV_LOG_DEBUG,
604  "thread awaiting %d field %d from %p\n", n, field, progress);
605 
607  while (atomic_load_explicit(&progress[field], memory_order_relaxed) < n)
610 }
611 
613  PerThreadContext *p = avctx->internal->thread_ctx;
614 
615  if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
616 
617  if (avctx->hwaccel && !p->hwaccel_serializing) {
619  p->hwaccel_serializing = 1;
620  }
621 
622  /* this assumes that no hwaccel calls happen before ff_thread_finish_setup() */
623  if (avctx->hwaccel &&
625  p->async_serializing = 1;
626 
627  async_lock(p->parent);
628  }
629 
632  av_log(avctx, AV_LOG_WARNING, "Multiple ff_thread_finish_setup() calls\n");
633  }
634 
636 
639 }
640 
641 /// Waits for all threads to finish.
642 static void park_frame_worker_threads(FrameThreadContext *fctx, int thread_count)
643 {
644  int i;
645 
646  async_unlock(fctx);
647 
648  for (i = 0; i < thread_count; i++) {
649  PerThreadContext *p = &fctx->threads[i];
650 
651  if (atomic_load(&p->state) != STATE_INPUT_READY) {
653  while (atomic_load(&p->state) != STATE_INPUT_READY)
656  }
657  p->got_frame = 0;
658  }
659 
660  async_lock(fctx);
661 }
662 
663 void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
664 {
665  FrameThreadContext *fctx = avctx->internal->thread_ctx;
666  const AVCodec *codec = avctx->codec;
667  int i, j;
668 
669  park_frame_worker_threads(fctx, thread_count);
670 
671  if (fctx->prev_thread && avctx->internal->hwaccel_priv_data !=
673  if (update_context_from_thread(avctx, fctx->prev_thread->avctx, 1) < 0) {
674  av_log(avctx, AV_LOG_ERROR, "Failed to update user thread.\n");
675  }
676  }
677 
678  if (fctx->prev_thread && fctx->prev_thread != fctx->threads)
679  if (update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0) < 0) {
680  av_log(avctx, AV_LOG_ERROR, "Final thread update failed\n");
682  fctx->threads->avctx->internal->is_copy = 1;
683  }
684 
685  for (i = 0; i < thread_count; i++) {
686  PerThreadContext *p = &fctx->threads[i];
687 
689  p->die = 1;
692 
693  if (p->thread_init)
694  pthread_join(p->thread, NULL);
695  p->thread_init=0;
696 
697  if (codec->close && p->avctx)
698  codec->close(p->avctx);
699 
701  av_frame_free(&p->frame);
702  }
703 
704  for (i = 0; i < thread_count; i++) {
705  PerThreadContext *p = &fctx->threads[i];
706 
712  av_packet_unref(&p->avpkt);
713 
714  for (j = 0; j < p->released_buffers_allocated; j++)
717 
718  if (p->avctx) {
719  if (codec->priv_class)
721  av_freep(&p->avctx->priv_data);
722 
724  }
725 
726  if (p->avctx) {
728  av_freep(&p->avctx->internal);
730  }
731 
732  av_freep(&p->avctx);
733  }
734 
735  av_freep(&fctx->threads);
740 
741  av_freep(&avctx->internal->thread_ctx);
742 
743  if (avctx->priv_data && avctx->codec && avctx->codec->priv_class)
744  av_opt_free(avctx->priv_data);
745  avctx->codec = NULL;
746 }
747 
749 {
750  int thread_count = avctx->thread_count;
751  const AVCodec *codec = avctx->codec;
753  FrameThreadContext *fctx;
754  int i, err = 0;
755 
756  if (!thread_count) {
757  int nb_cpus = av_cpu_count();
758 #if FF_API_DEBUG_MV
759  if ((avctx->debug & (FF_DEBUG_VIS_QP | FF_DEBUG_VIS_MB_TYPE)) || avctx->debug_mv)
760  nb_cpus = 1;
761 #endif
762  // use number of cores + 1 as thread count if there is more than one
763  if (nb_cpus > 1)
764  thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
765  else
766  thread_count = avctx->thread_count = 1;
767  }
768 
769  if (thread_count <= 1) {
770  avctx->active_thread_type = 0;
771  return 0;
772  }
773 
774  avctx->internal->thread_ctx = fctx = av_mallocz(sizeof(FrameThreadContext));
775  if (!fctx)
776  return AVERROR(ENOMEM);
777 
778  fctx->threads = av_mallocz_array(thread_count, sizeof(PerThreadContext));
779  if (!fctx->threads) {
780  av_freep(&avctx->internal->thread_ctx);
781  return AVERROR(ENOMEM);
782  }
783 
788 
789  fctx->async_lock = 1;
790  fctx->delaying = 1;
791 
792  if (codec->type == AVMEDIA_TYPE_VIDEO)
793  avctx->delay = src->thread_count - 1;
794 
795  for (i = 0; i < thread_count; i++) {
797  PerThreadContext *p = &fctx->threads[i];
798 
804 
805  p->frame = av_frame_alloc();
806  if (!p->frame) {
807  av_freep(&copy);
808  err = AVERROR(ENOMEM);
809  goto error;
810  }
811 
812  p->parent = fctx;
813  p->avctx = copy;
814 
815  if (!copy) {
816  err = AVERROR(ENOMEM);
817  goto error;
818  }
819 
820  *copy = *src;
821 
822  copy->internal = av_malloc(sizeof(AVCodecInternal));
823  if (!copy->internal) {
824  copy->priv_data = NULL;
825  err = AVERROR(ENOMEM);
826  goto error;
827  }
828  *copy->internal = *src->internal;
829  copy->internal->thread_ctx = p;
830  copy->internal->last_pkt_props = &p->avpkt;
831 
832  copy->delay = avctx->delay;
833 
834  if (codec->priv_data_size) {
835  copy->priv_data = av_mallocz(codec->priv_data_size);
836  if (!copy->priv_data) {
837  err = AVERROR(ENOMEM);
838  goto error;
839  }
840 
841  if (codec->priv_class) {
842  *(const AVClass **)copy->priv_data = codec->priv_class;
843  err = av_opt_copy(copy->priv_data, src->priv_data);
844  if (err < 0)
845  goto error;
846  }
847  }
848 
849  if (i)
850  copy->internal->is_copy = 1;
851 
852  if (codec->init)
853  err = codec->init(copy);
854 
855  if (err) goto error;
856 
857  if (!i)
858  update_context_from_thread(avctx, copy, 1);
859 
860  atomic_init(&p->debug_threads, (copy->debug & FF_DEBUG_THREADS) != 0);
861 
863  p->thread_init= !err;
864  if(!p->thread_init)
865  goto error;
866  }
867 
868  return 0;
869 
870 error:
871  ff_frame_thread_free(avctx, i+1);
872 
873  return err;
874 }
875 
877 {
878  int i;
879  FrameThreadContext *fctx = avctx->internal->thread_ctx;
880 
881  if (!fctx) return;
882 
884  if (fctx->prev_thread) {
885  if (fctx->prev_thread != &fctx->threads[0])
887  }
888 
889  fctx->next_decoding = fctx->next_finished = 0;
890  fctx->delaying = 1;
891  fctx->prev_thread = NULL;
892  for (i = 0; i < avctx->thread_count; i++) {
893  PerThreadContext *p = &fctx->threads[i];
894  // Make sure decode flush calls with size=0 won't return old frames
895  p->got_frame = 0;
896  av_frame_unref(p->frame);
897  p->result = 0;
898 
900 
901  if (avctx->codec->flush)
902  avctx->codec->flush(p->avctx);
903  }
904 }
905 
907 {
908  PerThreadContext *p = avctx->internal->thread_ctx;
910  (avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {
911  return 0;
912  }
913  return 1;
914 }
915 
917 {
918  PerThreadContext *p = avctx->internal->thread_ctx;
919  int err;
920 
921  f->owner[0] = f->owner[1] = avctx;
922 
923  if (!(avctx->active_thread_type & FF_THREAD_FRAME))
924  return ff_get_buffer(avctx, f->f, flags);
925 
926  if (atomic_load(&p->state) != STATE_SETTING_UP &&
927  (avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {
928  av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
929  return -1;
930  }
931 
933  atomic_int *progress;
934  f->progress = av_buffer_alloc(2 * sizeof(*progress));
935  if (!f->progress) {
936  return AVERROR(ENOMEM);
937  }
938  progress = (atomic_int*)f->progress->data;
939 
940  atomic_init(&progress[0], -1);
941  atomic_init(&progress[1], -1);
942  }
943 
945  if (THREAD_SAFE_CALLBACKS(avctx)) {
946  err = ff_get_buffer(avctx, f->f, flags);
947  } else {
949  p->requested_frame = f->f;
950  p->requested_flags = flags;
951  atomic_store_explicit(&p->state, STATE_GET_BUFFER, memory_order_release);
953 
954  while (atomic_load(&p->state) != STATE_SETTING_UP)
956 
957  err = p->result;
958 
960 
961  }
962  if (!THREAD_SAFE_CALLBACKS(avctx) && !avctx->codec->update_thread_context)
963  ff_thread_finish_setup(avctx);
964  if (err)
966 
968 
969  return err;
970 }
971 
973 {
974  enum AVPixelFormat res;
975  PerThreadContext *p = avctx->internal->thread_ctx;
976  if (!(avctx->active_thread_type & FF_THREAD_FRAME) || avctx->thread_safe_callbacks ||
978  return ff_get_format(avctx, fmt);
979  if (atomic_load(&p->state) != STATE_SETTING_UP) {
980  av_log(avctx, AV_LOG_ERROR, "get_format() cannot be called after ff_thread_finish_setup()\n");
981  return -1;
982  }
984  p->available_formats = fmt;
987 
988  while (atomic_load(&p->state) != STATE_SETTING_UP)
990 
991  res = p->result_format;
992 
994 
995  return res;
996 }
997 
999 {
1000  int ret = thread_get_buffer_internal(avctx, f, flags);
1001  if (ret < 0)
1002  av_log(avctx, AV_LOG_ERROR, "thread_get_buffer() failed\n");
1003  return ret;
1004 }
1005 
1007 {
1008  PerThreadContext *p = avctx->internal->thread_ctx;
1009  FrameThreadContext *fctx;
1010  AVFrame *dst;
1011  int ret = 0;
1012  int can_direct_free = !(avctx->active_thread_type & FF_THREAD_FRAME) ||
1013  THREAD_SAFE_CALLBACKS(avctx);
1014 
1015  if (!f->f)
1016  return;
1017 
1018  if (avctx->debug & FF_DEBUG_BUFFERS)
1019  av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p\n", f);
1020 
1022  f->owner[0] = f->owner[1] = NULL;
1023 
1024  // when the frame buffers are not allocated, just reset it to clean state
1025  if (can_direct_free || !f->f->buf[0]) {
1026  av_frame_unref(f->f);
1027  return;
1028  }
1029 
1030  fctx = p->parent;
1032 
1035  sizeof(*p->released_buffers));
1036  if (tmp) {
1038  p->released_buffers = tmp;
1039  }
1040 
1041  if (!tmp || !tmp[p->released_buffers_allocated]) {
1042  ret = AVERROR(ENOMEM);
1043  goto fail;
1044  }
1046  }
1047 
1049  av_frame_move_ref(dst, f->f);
1050 
1051  p->num_released_buffers++;
1052 
1053 fail:
1055 
1056  // make sure the frame is clean even if we fail to free it
1057  // this leaks, but it is better than crashing
1058  if (ret < 0) {
1059  av_log(avctx, AV_LOG_ERROR, "Could not queue a frame for freeing, this will leak\n");
1060  memset(f->f->buf, 0, sizeof(f->f->buf));
1061  if (f->f->extended_buf)
1062  memset(f->f->extended_buf, 0, f->f->nb_extended_buf * sizeof(*f->f->extended_buf));
1063  av_frame_unref(f->f);
1064  }
1065 }
static int thread_get_buffer_internal(AVCodecContext *avctx, ThreadFrame *f, int flags)
enum AVPixelFormat(* get_format)(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
callback to negotiate the pixelFormat
Definition: avcodec.h:778
int caps_internal
Internal hwaccel capabilities.
Definition: avcodec.h:2559
Set when the codec calls get_format().
Definition: pthread_frame.c:62
pthread_cond_t progress_cond
Used by child threads to wait for progress to change.
Definition: pthread_frame.c:76
#define NULL
Definition: coverity.c:32
int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
Select the (possibly hardware accelerated) pixel format.
Definition: decode.c:1279
const struct AVCodec * codec
Definition: avcodec.h:535
AVRational framerate
Definition: avcodec.h:2069
#define AV_CODEC_PROP_INTRA_ONLY
Codec uses only intra compression.
Definition: codec_desc.h:72
const AVCodecDescriptor * codec_descriptor
AVCodecDescriptor.
Definition: avcodec.h:2090
static av_always_inline int pthread_mutex_destroy(pthread_mutex_t *mutex)
Definition: os2threads.h:112
static void copy(const float *p1, float *p2, const int length)
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:125
This structure describes decoded (raw) audio or video data.
Definition: frame.h:300
#define pthread_mutex_lock(a)
Definition: ffprobe.c:62
if(ret< 0)
Definition: vf_mcdeint.c:279
static av_always_inline int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
Definition: os2threads.h:192
#define atomic_store(object, desired)
Definition: stdatomic.h:85
Context used by codec threads and stored in their AVCodecInternal thread_ctx.
Definition: pthread_frame.c:70
int av_cpu_count(void)
Definition: cpu.c:267
AVFrame * requested_frame
AVFrame the codec passed to get_buffer()
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:714
atomic_int state
Definition: pthread_frame.c:90
AVPacket * last_pkt_props
Properties (timestamps+side data) extracted from the last packet passed for decoding.
Definition: internal.h:144
static int submit_packet(PerThreadContext *p, AVCodecContext *user_avctx, AVPacket *avpkt)
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
AVFrame * f
Definition: thread.h:35
Memory handling functions.
AVBufferRef * buf[AV_NUM_DATA_POINTERS]
AVBuffer references backing the data for this frame.
Definition: frame.h:491
Set when the codec calls get_buffer().
Definition: pthread_frame.c:57
void(* flush)(struct AVCodecContext *)
Flush buffers.
Definition: codec.h:305
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:1161
int nb_extended_buf
Number of elements in extended_buf.
Definition: frame.h:509
int size
Definition: packet.h:356
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:905
Set when the thread is awaiting a packet.
Definition: pthread_frame.c:50
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:736
void av_frame_move_ref(AVFrame *dst, AVFrame *src)
Move everything contained in src to dst and reset src.
Definition: frame.c:583
enum AVMediaType type
Definition: codec.h:203
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:1757
static void error(const char *err)
pthread_cond_t input_cond
Used to wait for a new packet from the main thread.
Definition: pthread_frame.c:75
intptr_t atomic_int
Definition: stdatomic.h:55
void ff_thread_await_progress(ThreadFrame *f, int n, int field)
Wait for earlier decoding threads to finish reference pictures.
const struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:1690
int profile
profile
Definition: avcodec.h:1859
enum AVPixelFormat * available_formats
Format array for get_format()
AVCodec.
Definition: codec.h:190
static av_always_inline int pthread_cond_destroy(pthread_cond_t *cond)
Definition: os2threads.h:144
AVPacket avpkt
Input packet (for decoding) or output (for encoding).
Definition: pthread_frame.c:84
void(* draw_horiz_band)(struct AVCodecContext *s, const AVFrame *src, int offset[AV_NUM_DATA_POINTERS], int y, int type, int height)
If non NULL, &#39;draw_horiz_band&#39; is called by the libavcodec decoder to draw a horizontal band...
Definition: avcodec.h:761
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:649
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:2004
#define AV_CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: codec.h:75
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
int export_side_data
Bit set of AV_CODEC_EXPORT_DATA_* flags, which affects the kind of metadata exported in frame...
Definition: avcodec.h:2354
enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
Definition: decode.c:1067
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1194
#define av_malloc(s)
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:190
void * hwaccel_context
Hardware accelerator context.
Definition: avcodec.h:1702
AVOptions.
#define f(width, name)
Definition: cbs_vp9.c:255
static attribute_align_arg void * frame_worker_thread(void *arg)
Codec worker thread.
void * thread_ctx
Definition: internal.h:135
Multithreading support functions.
#define THREAD_SAFE_CALLBACKS(avctx)
pthread_mutex_t hwaccel_mutex
This lock is used for ensuring threads run in serial when hwaccel is used.
static void finish(void)
Definition: movenc.c:345
int requested_flags
flags passed to get_buffer() for requested_frame
int next_decoding
The next context to submit a packet to.
static av_always_inline int pthread_cond_signal(pthread_cond_t *cond)
Definition: os2threads.h:152
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:1750
void ff_thread_finish_setup(AVCodecContext *avctx)
If the codec defines update_thread_context(), call this when they are ready for the next thread to st...
void * av_realloc_array(void *ptr, size_t nmemb, size_t size)
Allocate, reallocate, or free an array.
Definition: mem.c:200
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:1168
Context stored in the client AVCodecInternal thread_ctx.
AVCodecContext * avctx
Context used to decode packets passed to this thread.
Definition: pthread_frame.c:82
#define av_log(a,...)
#define FF_CODEC_CAP_ALLOCATE_PROGRESS
Definition: internal.h:75
int av_packet_ref(AVPacket *dst, const AVPacket *src)
Setup a new reference to the data described by a given packet.
Definition: avpacket.c:614
int die
Set when the thread should exit.
int ff_thread_decode_frame(AVCodecContext *avctx, AVFrame *picture, int *got_picture_ptr, AVPacket *avpkt)
Submit a new frame to a decoding thread.
int slice_count
slice count
Definition: avcodec.h:880
Libavcodec version macros.
#define src
Definition: vp8dsp.c:254
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:816
PerThreadContext * prev_thread
The last thread submit_packet() was called on.
void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
Wrapper around release_buffer() frame-for multithreaded codecs.
#define atomic_load(object)
Definition: stdatomic.h:93
int is_copy
Whether the parent AVCodecContext is a copy of the context which had init() called on it...
Definition: internal.h:123
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
int active_thread_type
Which multithreading methods are in use by the codec.
Definition: avcodec.h:1804
int capabilities
Codec capabilities.
Definition: codec.h:209
int result
The result of the last codec decode/encode() call.
Definition: pthread_frame.c:88
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
const char * arg
Definition: jacosubdec.c:66
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:606
simple assert() macros that are a bit more flexible than ISO C assert().
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:239
#define fail()
Definition: checkasm.h:123
reference-counted frame API
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1237
int av_reallocp_array(void *ptr, size_t nmemb, size_t size)
Allocate, reallocate, or free an array through a pointer to a pointer.
Definition: mem.c:208
int props
Codec properties, a combination of AV_CODEC_PROP_* flags.
Definition: codec_desc.h:54
common internal API header
#define HWACCEL_CAP_ASYNC_SAFE
Definition: hwconfig.h:26
pthread_cond_t output_cond
Used by the main thread to wait for frames to finish.
Definition: pthread_frame.c:77
int(* update_thread_context)(struct AVCodecContext *dst, const struct AVCodecContext *src)
Copy necessary context variables from a previous thread context to the current one.
Definition: codec.h:251
AVFrame ** released_buffers
Array of frames passed to ff_thread_release_buffer().
Definition: pthread_frame.c:96
#define FF_THREAD_FRAME
Decode more than one frame at once.
Definition: avcodec.h:1796
#define FFMIN(a, b)
Definition: common.h:96
AVBufferRef ** extended_buf
For planar audio which requires more than AV_NUM_DATA_POINTERS AVBufferRef pointers, this array will hold all the references which cannot fit into AVFrame.buf.
Definition: frame.h:505
int width
picture width / height.
Definition: avcodec.h:699
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:1729
AVBufferRef * hw_frames_ctx
A reference to the AVHWFramesContext describing the input (for encoding) or output (decoding) frames...
Definition: avcodec.h:2226
int priv_data_size
Definition: codec.h:238
void ff_thread_report_progress(ThreadFrame *f, int n, int field)
Notify later decoding threads when part of their reference picture is ready.
#define atomic_load_explicit(object, order)
Definition: stdatomic.h:96
enum AVColorPrimaries color_primaries
Chromaticity coordinates of the source primaries.
Definition: avcodec.h:1140
static av_always_inline int pthread_join(pthread_t thread, void **value_ptr)
Definition: os2threads.h:94
static av_always_inline int pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *attr)
Definition: os2threads.h:104
int level
level
Definition: avcodec.h:1982
#define FF_DEBUG_BUFFERS
Definition: avcodec.h:1633
int64_t reordered_opaque
opaque 64-bit number (generally a PTS) that will be reordered and output in AVFrame.reordered_opaque
Definition: avcodec.h:1683
int ticks_per_frame
For some codecs, the time base is closer to the field rate than the frame rate.
Definition: avcodec.h:658
pthread_t thread
Definition: pthread_frame.c:73
#define pthread_mutex_unlock(a)
Definition: ffprobe.c:66
#define FF_DEBUG_THREADS
Definition: avcodec.h:1634
int thread_count
thread count is used to decide how many independent tasks should be passed to execute() ...
Definition: avcodec.h:1785
int got_frame
The output of got_picture_ptr from the last avcodec_decode_video() call.
Definition: pthread_frame.c:87
static int update_context_from_user(AVCodecContext *dst, AVCodecContext *src)
Update the next thread&#39;s AVCodecContext with values set by the user.
pthread_mutex_t buffer_mutex
Mutex used to protect get/release_buffer().
AVBufferRef * progress
Definition: thread.h:39
pthread_mutex_t progress_mutex
Mutex used to protect frame progress values and progress_cond.
Definition: pthread_frame.c:80
#define attribute_align_arg
Definition: internal.h:62
static av_always_inline int pthread_create(pthread_t *thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
Definition: os2threads.h:80
int(* decode)(struct AVCodecContext *, void *outdata, int *outdata_size, struct AVPacket *avpkt)
Definition: codec.h:282
pthread_cond_t async_cond
int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags)
The default callback for AVCodecContext.get_buffer2().
Definition: decode.c:1649
Libavcodec external API header.
enum AVMediaType codec_type
Definition: avcodec.h:534
enum AVCodecID codec_id
Definition: avcodec.h:536
AVBufferRef * av_buffer_alloc(int size)
Allocate an AVBuffer of the given size using av_malloc().
Definition: buffer.c:67
int sample_rate
samples per second
Definition: avcodec.h:1186
enum AVDiscard skip_idct
Skip IDCT/dequantization for selected frames.
Definition: avcodec.h:1997
int debug
debug
Definition: avcodec.h:1611
int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
Wrapper around get_buffer() for frame-multithreaded codecs.
main external API structure.
Definition: avcodec.h:526
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:605
uint8_t * data
The data buffer.
Definition: buffer.h:89
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1854
int slice_flags
slice flags
Definition: avcodec.h:1004
AVCodecContext * owner[2]
Definition: thread.h:36
int coded_height
Definition: avcodec.h:714
Describe the class of an AVClass context structure.
Definition: log.h:67
int(* init)(struct AVCodecContext *)
Definition: codec.h:267
int(* get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags)
This callback is called at the beginning of each frame to get data buffer(s) for it.
Definition: avcodec.h:1341
enum AVColorSpace colorspace
YUV colorspace type.
Definition: avcodec.h:1154
enum AVColorTransferCharacteristic color_trc
Color Transfer Characteristic.
Definition: avcodec.h:1147
enum AVPixelFormat result_format
get_format() result
int delaying
Set for the first N packets, where N is the number of threads.
refcounted data buffer API
enum AVPixelFormat ff_thread_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
Wrapper around get_format() for frame-multithreaded codecs.
#define atomic_store_explicit(object, desired, order)
Definition: stdatomic.h:90
static void async_unlock(FrameThreadContext *fctx)
PerThreadContext * threads
The contexts for each thread.
static void async_lock(FrameThreadContext *fctx)
AVBufferRef * pool
Definition: internal.h:133
#define MAX_AUTO_THREADS
struct FrameThreadContext * parent
Definition: pthread_frame.c:71
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:554
#define flags(name, subs,...)
Definition: cbs_av1.c:564
const AVClass * priv_class
AVClass for the private context.
Definition: codec.h:216
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:314
int64_t pkt_dts
DTS copied from the AVPacket that triggered returning this frame.
Definition: frame.h:409
void av_opt_free(void *obj)
Free all allocated objects in obj.
Definition: opt.c:1610
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:84
common internal api header.
_fmutex pthread_mutex_t
Definition: os2threads.h:53
common internal and external API header
int released_buffers_allocated
Definition: pthread_frame.c:98
void * hwaccel_priv_data
hwaccel-specific private data
Definition: internal.h:162
AVBufferRef * av_buffer_ref(AVBufferRef *buf)
Create a new reference to an AVBuffer.
Definition: buffer.c:93
static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src, int for_user)
Update the next thread&#39;s AVCodecContext with values from the reference thread&#39;s context.
int av_opt_copy(void *dst, const void *src)
Copy options from src object into dest object.
Definition: opt.c:1768
static av_always_inline int pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *attr)
Definition: os2threads.h:133
attribute_deprecated AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:1776
int caps_internal
Internal codec capabilities.
Definition: codec.h:310
enum AVDiscard skip_loop_filter
Skip loop filtering for selected frames.
Definition: avcodec.h:1990
int thread_safe_callbacks
Set by the client if its custom get_buffer() callback can be called synchronously from another thread...
Definition: avcodec.h:1814
void * priv_data
Definition: avcodec.h:553
int(* close)(struct AVCodecContext *)
Definition: codec.h:283
void ff_thread_flush(AVCodecContext *avctx)
Wait for decoding threads to finish and reset internal state.
AVFrame * frame
Output frame (for decoding) or input (for encoding).
Definition: pthread_frame.c:86
int ff_thread_can_start_frame(AVCodecContext *avctx)
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:85
static av_always_inline int pthread_cond_broadcast(pthread_cond_t *cond)
Definition: os2threads.h:162
int channels
number of audio channels
Definition: avcodec.h:1187
struct AVCodecInternal * internal
Private context used for internal data.
Definition: avcodec.h:561
pthread_mutex_t mutex
Mutex used to protect the contents of the PerThreadContext.
Definition: pthread_frame.c:79
int flags2
AV_CODEC_FLAG2_*.
Definition: avcodec.h:613
static void park_frame_worker_threads(FrameThreadContext *fctx, int thread_count)
Waits for all threads to finish.
pthread_mutex_t async_mutex
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: packet.h:354
int * slice_offset
slice offsets in the frame in bytes
Definition: avcodec.h:896
int frame_number
Frame counter, set by libavcodec.
Definition: avcodec.h:1217
atomic_int debug_threads
Set if the FF_DEBUG_THREADS option is set.
static void release_delayed_buffers(PerThreadContext *p)
Releases the buffers that this decoding thread was the last user of.
#define atomic_init(obj, value)
Definition: stdatomic.h:33
#define av_freep(p)
int hwaccel_flags
Bit set of AV_HWACCEL_FLAG_* flags, which affect hardware accelerated decoding (if active)...
Definition: avcodec.h:2287
int debug_mv
debug motion vectors
Definition: avcodec.h:2157
int next_finished
The next context to return output from.
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:347
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
This structure stores compressed data.
Definition: packet.h:332
int delay
Codec delay.
Definition: avcodec.h:682
int ff_frame_thread_init(AVCodecContext *avctx)
enum AVPixelFormat sw_pix_fmt
Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:2076
void * opaque
Private data of the user, can be used to carry app specific stuff.
Definition: avcodec.h:568
void * av_mallocz_array(size_t nmemb, size_t size)
Allocate a memory block for an array with av_mallocz().
Definition: mem.c:192
static uint8_t tmp[11]
Definition: aes_ctr.c:26