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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->framerate = src->framerate;
202  dst->width = src->width;
203  dst->height = src->height;
204  dst->pix_fmt = src->pix_fmt;
205 
206  dst->coded_width = src->coded_width;
207  dst->coded_height = src->coded_height;
208 
209  dst->has_b_frames = src->has_b_frames;
210  dst->idct_algo = src->idct_algo;
211 
214 #if FF_API_AFD
218 #endif /* FF_API_AFD */
219 
220  dst->profile = src->profile;
221  dst->level = src->level;
222 
224  dst->ticks_per_frame = src->ticks_per_frame;
225  dst->color_primaries = src->color_primaries;
226 
227  dst->color_trc = src->color_trc;
228  dst->colorspace = src->colorspace;
229  dst->color_range = src->color_range;
231 
232  dst->hwaccel = src->hwaccel;
233  dst->hwaccel_context = src->hwaccel_context;
234 
235  dst->channels = src->channels;
236  dst->sample_rate = src->sample_rate;
237  dst->sample_fmt = src->sample_fmt;
238  dst->channel_layout = src->channel_layout;
240  }
241 
242  if (for_user) {
243  dst->delay = src->thread_count - 1;
244  dst->coded_frame = src->coded_frame;
245  } else {
246  if (dst->codec->update_thread_context)
247  err = dst->codec->update_thread_context(dst, src);
248  }
249 
250  return err;
251 }
252 
253 /**
254  * Update the next thread's AVCodecContext with values set by the user.
255  *
256  * @param dst The destination context.
257  * @param src The source context.
258  * @return 0 on success, negative error code on failure
259  */
261 {
262 #define copy_fields(s, e) memcpy(&dst->s, &src->s, (char*)&dst->e - (char*)&dst->s);
263  dst->flags = src->flags;
264 
265  dst->draw_horiz_band= src->draw_horiz_band;
266  dst->get_buffer2 = src->get_buffer2;
267 #if FF_API_GET_BUFFER
269  dst->get_buffer = src->get_buffer;
270  dst->release_buffer = src->release_buffer;
272 #endif
273 
274  dst->opaque = src->opaque;
275  dst->debug = src->debug;
276  dst->debug_mv = src->debug_mv;
277 
278  dst->slice_flags = src->slice_flags;
279  dst->flags2 = src->flags2;
280 
281  copy_fields(skip_loop_filter, subtitle_header);
282 
283  dst->frame_number = src->frame_number;
286 
287  if (src->slice_count && src->slice_offset) {
288  if (dst->slice_count < src->slice_count) {
289  int *tmp = av_realloc(dst->slice_offset, src->slice_count *
290  sizeof(*dst->slice_offset));
291  if (!tmp) {
292  av_free(dst->slice_offset);
293  return AVERROR(ENOMEM);
294  }
295  dst->slice_offset = tmp;
296  }
297  memcpy(dst->slice_offset, src->slice_offset,
298  src->slice_count * sizeof(*dst->slice_offset));
299  }
300  dst->slice_count = src->slice_count;
301  return 0;
302 #undef copy_fields
303 }
304 
305 /// Releases the buffers that this decoding thread was the last user of.
307 {
308  FrameThreadContext *fctx = p->parent;
309 
310  while (p->num_released_buffers > 0) {
311  AVFrame *f;
312 
314 
315  // fix extended data in case the caller screwed it up
319  f->extended_data = f->data;
320  av_frame_unref(f);
321 
323  }
324 }
325 
327 {
328  FrameThreadContext *fctx = p->parent;
329  PerThreadContext *prev_thread = fctx->prev_thread;
330  const AVCodec *codec = p->avctx->codec;
331 
332  if (!avpkt->size && !(codec->capabilities & CODEC_CAP_DELAY)) return 0;
333 
335 
337 
338  if (prev_thread) {
339  int err;
340  if (prev_thread->state == STATE_SETTING_UP) {
341  pthread_mutex_lock(&prev_thread->progress_mutex);
342  while (prev_thread->state == STATE_SETTING_UP)
343  pthread_cond_wait(&prev_thread->progress_cond, &prev_thread->progress_mutex);
344  pthread_mutex_unlock(&prev_thread->progress_mutex);
345  }
346 
347  err = update_context_from_thread(p->avctx, prev_thread->avctx, 0);
348  if (err) {
350  return err;
351  }
352  }
353 
354  av_packet_unref(&p->avpkt);
355  av_packet_ref(&p->avpkt, avpkt);
356 
357  p->state = STATE_SETTING_UP;
360 
361  /*
362  * If the client doesn't have a thread-safe get_buffer(),
363  * then decoding threads call back to the main thread,
364  * and it calls back to the client here.
365  */
366 
368  if (!p->avctx->thread_safe_callbacks && (
371  p->avctx->get_buffer ||
372 #endif
375  while (p->state != STATE_SETUP_FINISHED && p->state != STATE_INPUT_READY) {
376  int call_done = 1;
378  while (p->state == STATE_SETTING_UP)
380 
381  switch (p->state) {
382  case STATE_GET_BUFFER:
384  break;
385  case STATE_GET_FORMAT:
387  break;
388  default:
389  call_done = 0;
390  break;
391  }
392  if (call_done) {
393  p->state = STATE_SETTING_UP;
395  }
397  }
398  }
399 
400  fctx->prev_thread = p;
401  fctx->next_decoding++;
402 
403  return 0;
404 }
405 
407  AVFrame *picture, int *got_picture_ptr,
408  AVPacket *avpkt)
409 {
410  FrameThreadContext *fctx = avctx->internal->thread_ctx;
411  int finished = fctx->next_finished;
412  PerThreadContext *p;
413  int err;
414 
415  /*
416  * Submit a packet to the next decoding thread.
417  */
418 
419  p = &fctx->threads[fctx->next_decoding];
420  err = update_context_from_user(p->avctx, avctx);
421  if (err) return err;
422  err = submit_packet(p, avpkt);
423  if (err) return err;
424 
425  /*
426  * If we're still receiving the initial packets, don't return a frame.
427  */
428 
429  if (fctx->next_decoding > (avctx->thread_count-1-(avctx->codec_id == AV_CODEC_ID_FFV1)))
430  fctx->delaying = 0;
431 
432  if (fctx->delaying) {
433  *got_picture_ptr=0;
434  if (avpkt->size)
435  return avpkt->size;
436  }
437 
438  /*
439  * Return the next available frame from the oldest thread.
440  * If we're at the end of the stream, then we have to skip threads that
441  * didn't output a frame, because we don't want to accidentally signal
442  * EOF (avpkt->size == 0 && *got_picture_ptr == 0).
443  */
444 
445  do {
446  p = &fctx->threads[finished++];
447 
448  if (p->state != STATE_INPUT_READY) {
450  while (p->state != STATE_INPUT_READY)
453  }
454 
455  av_frame_move_ref(picture, p->frame);
456  *got_picture_ptr = p->got_frame;
457  picture->pkt_dts = p->avpkt.dts;
458 
459  /*
460  * A later call with avkpt->size == 0 may loop over all threads,
461  * including this one, searching for a frame to return before being
462  * stopped by the "finished != fctx->next_finished" condition.
463  * Make sure we don't mistakenly return the same frame again.
464  */
465  p->got_frame = 0;
466 
467  if (finished >= avctx->thread_count) finished = 0;
468  } while (!avpkt->size && !*got_picture_ptr && finished != fctx->next_finished);
469 
470  update_context_from_thread(avctx, p->avctx, 1);
471 
472  if (fctx->next_decoding >= avctx->thread_count) fctx->next_decoding = 0;
473 
474  fctx->next_finished = finished;
475 
476  /* return the size of the consumed packet if no error occurred */
477  return (p->result >= 0) ? avpkt->size : p->result;
478 }
479 
480 void ff_thread_report_progress(ThreadFrame *f, int n, int field)
481 {
482  PerThreadContext *p;
483  volatile int *progress = f->progress ? (int*)f->progress->data : NULL;
484 
485  if (!progress || progress[field] >= n) return;
486 
487  p = f->owner->internal->thread_ctx;
488 
489  if (f->owner->debug&FF_DEBUG_THREADS)
490  av_log(f->owner, AV_LOG_DEBUG, "%p finished %d field %d\n", progress, n, field);
491 
493  progress[field] = n;
496 }
497 
498 void ff_thread_await_progress(ThreadFrame *f, int n, int field)
499 {
500  PerThreadContext *p;
501  volatile int *progress = f->progress ? (int*)f->progress->data : NULL;
502 
503  if (!progress || progress[field] >= n) return;
504 
505  p = f->owner->internal->thread_ctx;
506 
507  if (f->owner->debug&FF_DEBUG_THREADS)
508  av_log(f->owner, AV_LOG_DEBUG, "thread awaiting %d field %d from %p\n", n, field, progress);
509 
511  while (progress[field] < n)
514 }
515 
517  PerThreadContext *p = avctx->internal->thread_ctx;
518 
519  if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
520 
521  if(p->state == STATE_SETUP_FINISHED){
522  av_log(avctx, AV_LOG_WARNING, "Multiple ff_thread_finish_setup() calls\n");
523  }
524 
526  p->state = STATE_SETUP_FINISHED;
529 }
530 
531 /// Waits for all threads to finish.
532 static void park_frame_worker_threads(FrameThreadContext *fctx, int thread_count)
533 {
534  int i;
535 
536  for (i = 0; i < thread_count; i++) {
537  PerThreadContext *p = &fctx->threads[i];
538 
539  if (p->state != STATE_INPUT_READY) {
541  while (p->state != STATE_INPUT_READY)
544  }
545  p->got_frame = 0;
546  }
547 }
548 
549 void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
550 {
551  FrameThreadContext *fctx = avctx->internal->thread_ctx;
552  const AVCodec *codec = avctx->codec;
553  int i;
554 
555  park_frame_worker_threads(fctx, thread_count);
556 
557  if (fctx->prev_thread && fctx->prev_thread != fctx->threads)
558  if (update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0) < 0) {
559  av_log(avctx, AV_LOG_ERROR, "Final thread update failed\n");
561  fctx->threads->avctx->internal->is_copy = 1;
562  }
563 
564  fctx->die = 1;
565 
566  for (i = 0; i < thread_count; i++) {
567  PerThreadContext *p = &fctx->threads[i];
568 
572 
573  if (p->thread_init)
574  pthread_join(p->thread, NULL);
575  p->thread_init=0;
576 
577  if (codec->close)
578  codec->close(p->avctx);
579 
580  avctx->codec = NULL;
581 
583  av_frame_free(&p->frame);
584  }
585 
586  for (i = 0; i < thread_count; i++) {
587  PerThreadContext *p = &fctx->threads[i];
588 
594  av_packet_unref(&p->avpkt);
596 
597  if (i) {
598  av_freep(&p->avctx->priv_data);
600  }
601 
602  av_freep(&p->avctx->internal);
603  av_freep(&p->avctx);
604  }
605 
606  av_freep(&fctx->threads);
608  av_freep(&avctx->internal->thread_ctx);
609 }
610 
612 {
613  int thread_count = avctx->thread_count;
614  const AVCodec *codec = avctx->codec;
615  AVCodecContext *src = avctx;
616  FrameThreadContext *fctx;
617  int i, err = 0;
618 
619 #if HAVE_W32THREADS
620  w32thread_init();
621 #endif
622 
623  if (!thread_count) {
624  int nb_cpus = av_cpu_count();
625  if ((avctx->debug & (FF_DEBUG_VIS_QP | FF_DEBUG_VIS_MB_TYPE)) || avctx->debug_mv)
626  nb_cpus = 1;
627  // use number of cores + 1 as thread count if there is more than one
628  if (nb_cpus > 1)
629  thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
630  else
631  thread_count = avctx->thread_count = 1;
632  }
633 
634  if (thread_count <= 1) {
635  avctx->active_thread_type = 0;
636  return 0;
637  }
638 
639  avctx->internal->thread_ctx = fctx = av_mallocz(sizeof(FrameThreadContext));
640 
641  fctx->threads = av_mallocz_array(thread_count, sizeof(PerThreadContext));
642  pthread_mutex_init(&fctx->buffer_mutex, NULL);
643  fctx->delaying = 1;
644 
645  for (i = 0; i < thread_count; i++) {
647  PerThreadContext *p = &fctx->threads[i];
648 
649  pthread_mutex_init(&p->mutex, NULL);
651  pthread_cond_init(&p->input_cond, NULL);
652  pthread_cond_init(&p->progress_cond, NULL);
653  pthread_cond_init(&p->output_cond, NULL);
654 
655  p->frame = av_frame_alloc();
656  if (!p->frame) {
657  err = AVERROR(ENOMEM);
658  av_freep(&copy);
659  goto error;
660  }
661 
662  p->parent = fctx;
663  p->avctx = copy;
664 
665  if (!copy) {
666  err = AVERROR(ENOMEM);
667  goto error;
668  }
669 
670  *copy = *src;
671 
672  copy->internal = av_malloc(sizeof(AVCodecInternal));
673  if (!copy->internal) {
674  err = AVERROR(ENOMEM);
675  goto error;
676  }
677  *copy->internal = *src->internal;
678  copy->internal->thread_ctx = p;
679  copy->internal->pkt = &p->avpkt;
680 
681  if (!i) {
682  src = copy;
683 
684  if (codec->init)
685  err = codec->init(copy);
686 
687  update_context_from_thread(avctx, copy, 1);
688  } else {
689  copy->priv_data = av_malloc(codec->priv_data_size);
690  if (!copy->priv_data) {
691  err = AVERROR(ENOMEM);
692  goto error;
693  }
694  memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
695  copy->internal->is_copy = 1;
696 
697  if (codec->init_thread_copy)
698  err = codec->init_thread_copy(copy);
699  }
700 
701  if (err) goto error;
702 
703  err = AVERROR(pthread_create(&p->thread, NULL, frame_worker_thread, p));
704  p->thread_init= !err;
705  if(!p->thread_init)
706  goto error;
707  }
708 
709  return 0;
710 
711 error:
712  ff_frame_thread_free(avctx, i+1);
713 
714  return err;
715 }
716 
718 {
719  int i;
720  FrameThreadContext *fctx = avctx->internal->thread_ctx;
721 
722  if (!fctx) return;
723 
725  if (fctx->prev_thread) {
726  if (fctx->prev_thread != &fctx->threads[0])
728  }
729 
730  fctx->next_decoding = fctx->next_finished = 0;
731  fctx->delaying = 1;
732  fctx->prev_thread = NULL;
733  for (i = 0; i < avctx->thread_count; i++) {
734  PerThreadContext *p = &fctx->threads[i];
735  // Make sure decode flush calls with size=0 won't return old frames
736  p->got_frame = 0;
737  av_frame_unref(p->frame);
738 
740 
741  if (avctx->codec->flush)
742  avctx->codec->flush(p->avctx);
743  }
744 }
745 
747 {
748  PerThreadContext *p = avctx->internal->thread_ctx;
749  if ((avctx->active_thread_type&FF_THREAD_FRAME) && p->state != STATE_SETTING_UP &&
750  (avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {
751  return 0;
752  }
753  return 1;
754 }
755 
757 {
758  PerThreadContext *p = avctx->internal->thread_ctx;
759  int err;
760 
761  f->owner = avctx;
762 
763  ff_init_buffer_info(avctx, f->f);
764 
765  if (!(avctx->active_thread_type & FF_THREAD_FRAME))
766  return ff_get_buffer(avctx, f->f, flags);
767 
768  if (p->state != STATE_SETTING_UP &&
769  (avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {
770  av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
771  return -1;
772  }
773 
774  if (avctx->internal->allocate_progress) {
775  int *progress;
776  f->progress = av_buffer_alloc(2 * sizeof(int));
777  if (!f->progress) {
778  return AVERROR(ENOMEM);
779  }
780  progress = (int*)f->progress->data;
781 
782  progress[0] = progress[1] = -1;
783  }
784 
787  if (avctx->thread_safe_callbacks || (
789  !avctx->get_buffer &&
790 #endif
793  err = ff_get_buffer(avctx, f->f, flags);
794  } else {
796  p->requested_frame = f->f;
797  p->requested_flags = flags;
798  p->state = STATE_GET_BUFFER;
800 
801  while (p->state != STATE_SETTING_UP)
803 
804  err = p->result;
805 
807 
808  }
809  if (!THREAD_SAFE_CALLBACKS(avctx) && !avctx->codec->update_thread_context)
810  ff_thread_finish_setup(avctx);
811 
812  if (err)
814 
816 
817  return err;
818 }
819 
821 {
822  enum AVPixelFormat res;
823  PerThreadContext *p = avctx->internal->thread_ctx;
824  if (!(avctx->active_thread_type & FF_THREAD_FRAME) || avctx->thread_safe_callbacks ||
826  return ff_get_format(avctx, fmt);
827  if (p->state != STATE_SETTING_UP) {
828  av_log(avctx, AV_LOG_ERROR, "get_format() cannot be called after ff_thread_finish_setup()\n");
829  return -1;
830  }
832  p->available_formats = fmt;
833  p->state = STATE_GET_FORMAT;
835 
836  while (p->state != STATE_SETTING_UP)
838 
839  res = p->result_format;
840 
842 
843  return res;
844 }
845 
847 {
848  int ret = thread_get_buffer_internal(avctx, f, flags);
849  if (ret < 0)
850  av_log(avctx, AV_LOG_ERROR, "thread_get_buffer() failed\n");
851  return ret;
852 }
853 
855 {
856  PerThreadContext *p = avctx->internal->thread_ctx;
857  FrameThreadContext *fctx;
858  AVFrame *dst, *tmp;
860  int can_direct_free = !(avctx->active_thread_type & FF_THREAD_FRAME) ||
861  avctx->thread_safe_callbacks ||
862  (
864  !avctx->get_buffer &&
865 #endif
868 
869  if (!f->f || !f->f->buf[0])
870  return;
871 
872  if (avctx->debug & FF_DEBUG_BUFFERS)
873  av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p\n", f);
874 
876  f->owner = NULL;
877 
878  if (can_direct_free) {
879  av_frame_unref(f->f);
880  return;
881  }
882 
883  fctx = p->parent;
885 
886  if (p->num_released_buffers + 1 >= INT_MAX / sizeof(*p->released_buffers))
887  goto fail;
889  (p->num_released_buffers + 1) *
890  sizeof(*p->released_buffers));
891  if (!tmp)
892  goto fail;
893  p->released_buffers = tmp;
894 
896  av_frame_move_ref(dst, f->f);
897 
899 
900 fail:
902 }