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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 <stdint.h>
28 
29 #if HAVE_PTHREADS
30 #include <pthread.h>
31 #elif HAVE_W32THREADS
32 #include "compat/w32pthreads.h"
33 #elif HAVE_OS2THREADS
34 #include "compat/os2threads.h"
35 #endif
36 
37 #include "avcodec.h"
38 #include "internal.h"
39 #include "pthread_internal.h"
40 #include "thread.h"
41 #include "version.h"
42 
43 #include "libavutil/avassert.h"
44 #include "libavutil/buffer.h"
45 #include "libavutil/common.h"
46 #include "libavutil/cpu.h"
47 #include "libavutil/frame.h"
48 #include "libavutil/internal.h"
49 #include "libavutil/log.h"
50 #include "libavutil/mem.h"
51 
52 /**
53  * Context used by codec threads and stored in their AVCodecInternal thread_ctx.
54  */
55 typedef struct PerThreadContext {
57 
60  pthread_cond_t input_cond; ///< Used to wait for a new packet from the main thread.
61  pthread_cond_t progress_cond; ///< Used by child threads to wait for progress to change.
62  pthread_cond_t output_cond; ///< Used by the main thread to wait for frames to finish.
63 
64  pthread_mutex_t mutex; ///< Mutex used to protect the contents of the PerThreadContext.
65  pthread_mutex_t progress_mutex; ///< Mutex used to protect frame progress values and progress_cond.
66 
67  AVCodecContext *avctx; ///< Context used to decode packets passed to this thread.
68 
69  AVPacket avpkt; ///< Input packet (for decoding) or output (for encoding).
70 
71  AVFrame *frame; ///< Output frame (for decoding) or input (for encoding).
72  int got_frame; ///< The output of got_picture_ptr from the last avcodec_decode_video() call.
73  int result; ///< The result of the last codec decode/encode() call.
74 
75  enum {
76  STATE_INPUT_READY, ///< Set when the thread is awaiting a packet.
77  STATE_SETTING_UP, ///< Set before the codec has called ff_thread_finish_setup().
79  * Set when the codec calls get_buffer().
80  * State is returned to STATE_SETTING_UP afterwards.
81  */
83  * Set when the codec calls get_format().
84  * State is returned to STATE_SETTING_UP afterwards.
85  */
86  STATE_SETUP_FINISHED ///< Set after the codec has called ff_thread_finish_setup().
87  } state;
88 
89  /**
90  * Array of frames passed to ff_thread_release_buffer().
91  * Frames are released after all threads referencing them are finished.
92  */
96 
97  AVFrame *requested_frame; ///< AVFrame the codec passed to get_buffer()
98  int requested_flags; ///< flags passed to get_buffer() for requested_frame
99 
100  const enum AVPixelFormat *available_formats; ///< Format array for get_format()
101  enum AVPixelFormat result_format; ///< get_format() result
103 
104 /**
105  * Context stored in the client AVCodecInternal thread_ctx.
106  */
107 typedef struct FrameThreadContext {
108  PerThreadContext *threads; ///< The contexts for each thread.
109  PerThreadContext *prev_thread; ///< The last thread submit_packet() was called on.
110 
111  pthread_mutex_t buffer_mutex; ///< Mutex used to protect get/release_buffer().
112 
113  int next_decoding; ///< The next context to submit a packet to.
114  int next_finished; ///< The next context to return output from.
115 
116  int delaying; /**<
117  * Set for the first N packets, where N is the number of threads.
118  * While it is set, ff_thread_en/decode_frame won't return any results.
119  */
120 
121  int die; ///< Set when threads should exit.
123 
124 #if FF_API_GET_BUFFER
125 #define THREAD_SAFE_CALLBACKS(avctx) \
126 ((avctx)->thread_safe_callbacks || (!(avctx)->get_buffer && (avctx)->get_buffer2 == avcodec_default_get_buffer2))
127 #else
128 #define THREAD_SAFE_CALLBACKS(avctx) \
129 ((avctx)->thread_safe_callbacks || (avctx)->get_buffer2 == avcodec_default_get_buffer2)
130 #endif
131 
132 /**
133  * Codec worker thread.
134  *
135  * Automatically calls ff_thread_finish_setup() if the codec does
136  * not provide an update_thread_context method, or if the codec returns
137  * before calling it.
138  */
139 static attribute_align_arg void *frame_worker_thread(void *arg)
140 {
141  PerThreadContext *p = arg;
142  FrameThreadContext *fctx = p->parent;
143  AVCodecContext *avctx = p->avctx;
144  const AVCodec *codec = avctx->codec;
145 
147  while (1) {
148  while (p->state == STATE_INPUT_READY && !fctx->die)
150 
151  if (fctx->die) break;
152 
153  if (!codec->update_thread_context && THREAD_SAFE_CALLBACKS(avctx))
154  ff_thread_finish_setup(avctx);
155 
156  av_frame_unref(p->frame);
157  p->got_frame = 0;
158  p->result = codec->decode(avctx, p->frame, &p->got_frame, &p->avpkt);
159 
160  if ((p->result < 0 || !p->got_frame) && p->frame->buf[0]) {
161  if (avctx->internal->allocate_progress)
162  av_log(avctx, AV_LOG_ERROR, "A frame threaded decoder did not "
163  "free the frame on failure. This is a bug, please report it.\n");
164  av_frame_unref(p->frame);
165  }
166 
167  if (p->state == STATE_SETTING_UP) ff_thread_finish_setup(avctx);
168 
170 #if 0 //BUFREF-FIXME
171  for (i = 0; i < MAX_BUFFERS; i++)
172  if (p->progress_used[i] && (p->got_frame || p->result<0 || avctx->codec_id != AV_CODEC_ID_H264)) {
173  p->progress[i][0] = INT_MAX;
174  p->progress[i][1] = INT_MAX;
175  }
176 #endif
177  p->state = STATE_INPUT_READY;
178 
182  }
184 
185  return NULL;
186 }
187 
188 /**
189  * Update the next thread's AVCodecContext with values from the reference thread's context.
190  *
191  * @param dst The destination context.
192  * @param src The source context.
193  * @param for_user 0 if the destination is a codec thread, 1 if the destination is the user's thread
194  */
196 {
197  int err = 0;
198 
199  if (dst != src) {
200  dst->time_base = src->time_base;
201  dst->width = src->width;
202  dst->height = src->height;
203  dst->pix_fmt = src->pix_fmt;
204 
205  dst->coded_width = src->coded_width;
206  dst->coded_height = src->coded_height;
207 
208  dst->has_b_frames = src->has_b_frames;
209  dst->idct_algo = src->idct_algo;
210 
213 #if FF_API_AFD
217 #endif /* FF_API_AFD */
218 
219  dst->profile = src->profile;
220  dst->level = src->level;
221 
223  dst->ticks_per_frame = src->ticks_per_frame;
224  dst->color_primaries = src->color_primaries;
225 
226  dst->color_trc = src->color_trc;
227  dst->colorspace = src->colorspace;
228  dst->color_range = src->color_range;
230 
231  dst->hwaccel = src->hwaccel;
232  dst->hwaccel_context = src->hwaccel_context;
233 
234  dst->channels = src->channels;
235  dst->sample_rate = src->sample_rate;
236  dst->sample_fmt = src->sample_fmt;
237  dst->channel_layout = src->channel_layout;
239  }
240 
241  if (for_user) {
242  dst->delay = src->thread_count - 1;
243  dst->coded_frame = src->coded_frame;
244  } else {
245  if (dst->codec->update_thread_context)
246  err = dst->codec->update_thread_context(dst, src);
247  }
248 
249  return err;
250 }
251 
252 /**
253  * Update the next thread's AVCodecContext with values set by the user.
254  *
255  * @param dst The destination context.
256  * @param src The source context.
257  * @return 0 on success, negative error code on failure
258  */
260 {
261 #define copy_fields(s, e) memcpy(&dst->s, &src->s, (char*)&dst->e - (char*)&dst->s);
262  dst->flags = src->flags;
263 
264  dst->draw_horiz_band= src->draw_horiz_band;
265  dst->get_buffer2 = src->get_buffer2;
266 #if FF_API_GET_BUFFER
268  dst->get_buffer = src->get_buffer;
269  dst->release_buffer = src->release_buffer;
271 #endif
272 
273  dst->opaque = src->opaque;
274  dst->debug = src->debug;
275  dst->debug_mv = src->debug_mv;
276 
277  dst->slice_flags = src->slice_flags;
278  dst->flags2 = src->flags2;
279 
280  copy_fields(skip_loop_filter, subtitle_header);
281 
282  dst->frame_number = src->frame_number;
285 
286  if (src->slice_count && src->slice_offset) {
287  if (dst->slice_count < src->slice_count) {
288  int *tmp = av_realloc(dst->slice_offset, src->slice_count *
289  sizeof(*dst->slice_offset));
290  if (!tmp) {
291  av_free(dst->slice_offset);
292  return AVERROR(ENOMEM);
293  }
294  dst->slice_offset = tmp;
295  }
296  memcpy(dst->slice_offset, src->slice_offset,
297  src->slice_count * sizeof(*dst->slice_offset));
298  }
299  dst->slice_count = src->slice_count;
300  return 0;
301 #undef copy_fields
302 }
303 
304 /// Releases the buffers that this decoding thread was the last user of.
306 {
307  FrameThreadContext *fctx = p->parent;
308 
309  while (p->num_released_buffers > 0) {
310  AVFrame *f;
311 
313 
314  // fix extended data in case the caller screwed it up
318  f->extended_data = f->data;
319  av_frame_unref(f);
320 
322  }
323 }
324 
326 {
327  FrameThreadContext *fctx = p->parent;
328  PerThreadContext *prev_thread = fctx->prev_thread;
329  const AVCodec *codec = p->avctx->codec;
330 
331  if (!avpkt->size && !(codec->capabilities & CODEC_CAP_DELAY)) return 0;
332 
334 
336 
337  if (prev_thread) {
338  int err;
339  if (prev_thread->state == STATE_SETTING_UP) {
340  pthread_mutex_lock(&prev_thread->progress_mutex);
341  while (prev_thread->state == STATE_SETTING_UP)
342  pthread_cond_wait(&prev_thread->progress_cond, &prev_thread->progress_mutex);
343  pthread_mutex_unlock(&prev_thread->progress_mutex);
344  }
345 
346  err = update_context_from_thread(p->avctx, prev_thread->avctx, 0);
347  if (err) {
349  return err;
350  }
351  }
352 
353  av_packet_unref(&p->avpkt);
354  av_packet_ref(&p->avpkt, avpkt);
355 
356  p->state = STATE_SETTING_UP;
359 
360  /*
361  * If the client doesn't have a thread-safe get_buffer(),
362  * then decoding threads call back to the main thread,
363  * and it calls back to the client here.
364  */
365 
367  if (!p->avctx->thread_safe_callbacks && (
370  p->avctx->get_buffer ||
371 #endif
374  while (p->state != STATE_SETUP_FINISHED && p->state != STATE_INPUT_READY) {
375  int call_done = 1;
377  while (p->state == STATE_SETTING_UP)
379 
380  switch (p->state) {
381  case STATE_GET_BUFFER:
383  break;
384  case STATE_GET_FORMAT:
386  break;
387  default:
388  call_done = 0;
389  break;
390  }
391  if (call_done) {
392  p->state = STATE_SETTING_UP;
394  }
396  }
397  }
398 
399  fctx->prev_thread = p;
400  fctx->next_decoding++;
401 
402  return 0;
403 }
404 
406  AVFrame *picture, int *got_picture_ptr,
407  AVPacket *avpkt)
408 {
409  FrameThreadContext *fctx = avctx->internal->thread_ctx;
410  int finished = fctx->next_finished;
411  PerThreadContext *p;
412  int err;
413 
414  /*
415  * Submit a packet to the next decoding thread.
416  */
417 
418  p = &fctx->threads[fctx->next_decoding];
419  err = update_context_from_user(p->avctx, avctx);
420  if (err) return err;
421  err = submit_packet(p, avpkt);
422  if (err) return err;
423 
424  /*
425  * If we're still receiving the initial packets, don't return a frame.
426  */
427 
428  if (fctx->next_decoding > (avctx->thread_count-1-(avctx->codec_id == AV_CODEC_ID_FFV1)))
429  fctx->delaying = 0;
430 
431  if (fctx->delaying) {
432  *got_picture_ptr=0;
433  if (avpkt->size)
434  return avpkt->size;
435  }
436 
437  /*
438  * Return the next available frame from the oldest thread.
439  * If we're at the end of the stream, then we have to skip threads that
440  * didn't output a frame, because we don't want to accidentally signal
441  * EOF (avpkt->size == 0 && *got_picture_ptr == 0).
442  */
443 
444  do {
445  p = &fctx->threads[finished++];
446 
447  if (p->state != STATE_INPUT_READY) {
449  while (p->state != STATE_INPUT_READY)
452  }
453 
454  av_frame_move_ref(picture, p->frame);
455  *got_picture_ptr = p->got_frame;
456  picture->pkt_dts = p->avpkt.dts;
457 
458  /*
459  * A later call with avkpt->size == 0 may loop over all threads,
460  * including this one, searching for a frame to return before being
461  * stopped by the "finished != fctx->next_finished" condition.
462  * Make sure we don't mistakenly return the same frame again.
463  */
464  p->got_frame = 0;
465 
466  if (finished >= avctx->thread_count) finished = 0;
467  } while (!avpkt->size && !*got_picture_ptr && finished != fctx->next_finished);
468 
469  update_context_from_thread(avctx, p->avctx, 1);
470 
471  if (fctx->next_decoding >= avctx->thread_count) fctx->next_decoding = 0;
472 
473  fctx->next_finished = finished;
474 
475  /* return the size of the consumed packet if no error occurred */
476  return (p->result >= 0) ? avpkt->size : p->result;
477 }
478 
479 void ff_thread_report_progress(ThreadFrame *f, int n, int field)
480 {
481  PerThreadContext *p;
482  volatile int *progress = f->progress ? (int*)f->progress->data : NULL;
483 
484  if (!progress || progress[field] >= n) return;
485 
486  p = f->owner->internal->thread_ctx;
487 
488  if (f->owner->debug&FF_DEBUG_THREADS)
489  av_log(f->owner, AV_LOG_DEBUG, "%p finished %d field %d\n", progress, n, field);
490 
492  progress[field] = n;
495 }
496 
497 void ff_thread_await_progress(ThreadFrame *f, int n, int field)
498 {
499  PerThreadContext *p;
500  volatile int *progress = f->progress ? (int*)f->progress->data : NULL;
501 
502  if (!progress || progress[field] >= n) return;
503 
504  p = f->owner->internal->thread_ctx;
505 
506  if (f->owner->debug&FF_DEBUG_THREADS)
507  av_log(f->owner, AV_LOG_DEBUG, "thread awaiting %d field %d from %p\n", n, field, progress);
508 
510  while (progress[field] < n)
513 }
514 
516  PerThreadContext *p = avctx->internal->thread_ctx;
517 
518  if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
519 
520  if(p->state == STATE_SETUP_FINISHED){
521  av_log(avctx, AV_LOG_WARNING, "Multiple ff_thread_finish_setup() calls\n");
522  }
523 
525  p->state = STATE_SETUP_FINISHED;
528 }
529 
530 /// Waits for all threads to finish.
531 static void park_frame_worker_threads(FrameThreadContext *fctx, int thread_count)
532 {
533  int i;
534 
535  for (i = 0; i < thread_count; i++) {
536  PerThreadContext *p = &fctx->threads[i];
537 
538  if (p->state != STATE_INPUT_READY) {
540  while (p->state != STATE_INPUT_READY)
543  }
544  p->got_frame = 0;
545  }
546 }
547 
548 void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
549 {
550  FrameThreadContext *fctx = avctx->internal->thread_ctx;
551  const AVCodec *codec = avctx->codec;
552  int i;
553 
554  park_frame_worker_threads(fctx, thread_count);
555 
556  if (fctx->prev_thread && fctx->prev_thread != fctx->threads)
557  if (update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0) < 0) {
558  av_log(avctx, AV_LOG_ERROR, "Final thread update failed\n");
560  fctx->threads->avctx->internal->is_copy = 1;
561  }
562 
563  fctx->die = 1;
564 
565  for (i = 0; i < thread_count; i++) {
566  PerThreadContext *p = &fctx->threads[i];
567 
571 
572  if (p->thread_init)
573  pthread_join(p->thread, NULL);
574  p->thread_init=0;
575 
576  if (codec->close)
577  codec->close(p->avctx);
578 
579  avctx->codec = NULL;
580 
582  av_frame_free(&p->frame);
583  }
584 
585  for (i = 0; i < thread_count; i++) {
586  PerThreadContext *p = &fctx->threads[i];
587 
593  av_packet_unref(&p->avpkt);
595 
596  if (i) {
597  av_freep(&p->avctx->priv_data);
599  }
600 
601  av_freep(&p->avctx->internal);
602  av_freep(&p->avctx);
603  }
604 
605  av_freep(&fctx->threads);
607  av_freep(&avctx->internal->thread_ctx);
608 }
609 
611 {
612  int thread_count = avctx->thread_count;
613  const AVCodec *codec = avctx->codec;
614  AVCodecContext *src = avctx;
615  FrameThreadContext *fctx;
616  int i, err = 0;
617 
618 #if HAVE_W32THREADS
619  w32thread_init();
620 #endif
621 
622  if (!thread_count) {
623  int nb_cpus = av_cpu_count();
624  if ((avctx->debug & (FF_DEBUG_VIS_QP | FF_DEBUG_VIS_MB_TYPE)) || avctx->debug_mv)
625  nb_cpus = 1;
626  // use number of cores + 1 as thread count if there is more than one
627  if (nb_cpus > 1)
628  thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
629  else
630  thread_count = avctx->thread_count = 1;
631  }
632 
633  if (thread_count <= 1) {
634  avctx->active_thread_type = 0;
635  return 0;
636  }
637 
638  avctx->internal->thread_ctx = fctx = av_mallocz(sizeof(FrameThreadContext));
639 
640  fctx->threads = av_mallocz_array(thread_count, sizeof(PerThreadContext));
641  pthread_mutex_init(&fctx->buffer_mutex, NULL);
642  fctx->delaying = 1;
643 
644  for (i = 0; i < thread_count; i++) {
646  PerThreadContext *p = &fctx->threads[i];
647 
648  pthread_mutex_init(&p->mutex, NULL);
650  pthread_cond_init(&p->input_cond, NULL);
651  pthread_cond_init(&p->progress_cond, NULL);
652  pthread_cond_init(&p->output_cond, NULL);
653 
654  p->frame = av_frame_alloc();
655  if (!p->frame) {
656  err = AVERROR(ENOMEM);
657  av_freep(&copy);
658  goto error;
659  }
660 
661  p->parent = fctx;
662  p->avctx = copy;
663 
664  if (!copy) {
665  err = AVERROR(ENOMEM);
666  goto error;
667  }
668 
669  *copy = *src;
670 
671  copy->internal = av_malloc(sizeof(AVCodecInternal));
672  if (!copy->internal) {
673  err = AVERROR(ENOMEM);
674  goto error;
675  }
676  *copy->internal = *src->internal;
677  copy->internal->thread_ctx = p;
678  copy->internal->pkt = &p->avpkt;
679 
680  if (!i) {
681  src = copy;
682 
683  if (codec->init)
684  err = codec->init(copy);
685 
686  update_context_from_thread(avctx, copy, 1);
687  } else {
688  copy->priv_data = av_malloc(codec->priv_data_size);
689  if (!copy->priv_data) {
690  err = AVERROR(ENOMEM);
691  goto error;
692  }
693  memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
694  copy->internal->is_copy = 1;
695 
696  if (codec->init_thread_copy)
697  err = codec->init_thread_copy(copy);
698  }
699 
700  if (err) goto error;
701 
702  err = AVERROR(pthread_create(&p->thread, NULL, frame_worker_thread, p));
703  p->thread_init= !err;
704  if(!p->thread_init)
705  goto error;
706  }
707 
708  return 0;
709 
710 error:
711  ff_frame_thread_free(avctx, i+1);
712 
713  return err;
714 }
715 
717 {
718  int i;
719  FrameThreadContext *fctx = avctx->internal->thread_ctx;
720 
721  if (!fctx) return;
722 
724  if (fctx->prev_thread) {
725  if (fctx->prev_thread != &fctx->threads[0])
727  }
728 
729  fctx->next_decoding = fctx->next_finished = 0;
730  fctx->delaying = 1;
731  fctx->prev_thread = NULL;
732  for (i = 0; i < avctx->thread_count; i++) {
733  PerThreadContext *p = &fctx->threads[i];
734  // Make sure decode flush calls with size=0 won't return old frames
735  p->got_frame = 0;
736  av_frame_unref(p->frame);
737 
739 
740  if (avctx->codec->flush)
741  avctx->codec->flush(p->avctx);
742  }
743 }
744 
746 {
747  PerThreadContext *p = avctx->internal->thread_ctx;
748  if ((avctx->active_thread_type&FF_THREAD_FRAME) && p->state != STATE_SETTING_UP &&
749  (avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {
750  return 0;
751  }
752  return 1;
753 }
754 
756 {
757  PerThreadContext *p = avctx->internal->thread_ctx;
758  int err;
759 
760  f->owner = avctx;
761 
762  ff_init_buffer_info(avctx, f->f);
763 
764  if (!(avctx->active_thread_type & FF_THREAD_FRAME))
765  return ff_get_buffer(avctx, f->f, flags);
766 
767  if (p->state != STATE_SETTING_UP &&
768  (avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {
769  av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
770  return -1;
771  }
772 
773  if (avctx->internal->allocate_progress) {
774  int *progress;
775  f->progress = av_buffer_alloc(2 * sizeof(int));
776  if (!f->progress) {
777  return AVERROR(ENOMEM);
778  }
779  progress = (int*)f->progress->data;
780 
781  progress[0] = progress[1] = -1;
782  }
783 
786  if (avctx->thread_safe_callbacks || (
788  !avctx->get_buffer &&
789 #endif
792  err = ff_get_buffer(avctx, f->f, flags);
793  } else {
795  p->requested_frame = f->f;
796  p->requested_flags = flags;
797  p->state = STATE_GET_BUFFER;
799 
800  while (p->state != STATE_SETTING_UP)
802 
803  err = p->result;
804 
806 
807  }
808  if (!THREAD_SAFE_CALLBACKS(avctx) && !avctx->codec->update_thread_context)
809  ff_thread_finish_setup(avctx);
810 
811  if (err)
813 
815 
816  return err;
817 }
818 
820 {
821  enum AVPixelFormat res;
822  PerThreadContext *p = avctx->internal->thread_ctx;
823  if (!(avctx->active_thread_type & FF_THREAD_FRAME) || avctx->thread_safe_callbacks ||
825  return ff_get_format(avctx, fmt);
826  if (p->state != STATE_SETTING_UP) {
827  av_log(avctx, AV_LOG_ERROR, "get_format() cannot be called after ff_thread_finish_setup()\n");
828  return -1;
829  }
831  p->available_formats = fmt;
832  p->state = STATE_GET_FORMAT;
834 
835  while (p->state != STATE_SETTING_UP)
837 
838  res = p->result_format;
839 
841 
842  return res;
843 }
844 
846 {
847  int ret = thread_get_buffer_internal(avctx, f, flags);
848  if (ret < 0)
849  av_log(avctx, AV_LOG_ERROR, "thread_get_buffer() failed\n");
850  return ret;
851 }
852 
854 {
855  PerThreadContext *p = avctx->internal->thread_ctx;
856  FrameThreadContext *fctx;
857  AVFrame *dst, *tmp;
859  int can_direct_free = !(avctx->active_thread_type & FF_THREAD_FRAME) ||
860  avctx->thread_safe_callbacks ||
861  (
863  !avctx->get_buffer &&
864 #endif
867 
868  if (!f->f || !f->f->buf[0])
869  return;
870 
871  if (avctx->debug & FF_DEBUG_BUFFERS)
872  av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p\n", f);
873 
875  f->owner = NULL;
876 
877  if (can_direct_free) {
878  av_frame_unref(f->f);
879  return;
880  }
881 
882  fctx = p->parent;
884 
885  if (p->num_released_buffers + 1 >= INT_MAX / sizeof(*p->released_buffers))
886  goto fail;
888  (p->num_released_buffers + 1) *
889  sizeof(*p->released_buffers));
890  if (!tmp)
891  goto fail;
892  p->released_buffers = tmp;
893 
895  av_frame_move_ref(dst, f->f);
896 
898 
899 fail:
901 }