2 * Copyright (c) 2004 Roman Shaposhnik
3 * Copyright (c) 2008 Alexander Strange (astrange@ithinksw.com)
5 * Many thanks to Steven M. Schultz for providing clever ideas and
6 * to Michael Niedermayer <michaelni@gmx.at> for writing initial
9 * This file is part of FFmpeg.
11 * FFmpeg is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU Lesser General Public
13 * License as published by the Free Software Foundation; either
14 * version 2.1 of the License, or (at your option) any later version.
16 * FFmpeg is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * Lesser General Public License for more details.
21 * You should have received a copy of the GNU Lesser General Public
22 * License along with FFmpeg; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 * Multithreading support functions
29 * @see doc/multithreading.txt
34 #if HAVE_SCHED_GETAFFINITY
37 #elif HAVE_GETSYSTEMINFO
40 #include <sys/types.h>
41 #include <sys/param.h>
42 #include <sys/sysctl.h>
52 #include "w32pthreads.h"
54 #include "os2threads.h"
57 typedef int (action_func)(AVCodecContext *c, void *arg);
58 typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr);
60 typedef struct ThreadContext {
70 pthread_cond_t last_job_cond;
71 pthread_cond_t current_job_cond;
72 pthread_mutex_t current_job_lock;
77 /// Max number of frame buffers that can be allocated when using frame threads.
78 #define MAX_BUFFERS (32+1)
81 * Context used by codec threads and stored in their AVCodecContext thread_opaque.
83 typedef struct PerThreadContext {
84 struct FrameThreadContext *parent;
88 pthread_cond_t input_cond; ///< Used to wait for a new packet from the main thread.
89 pthread_cond_t progress_cond; ///< Used by child threads to wait for progress to change.
90 pthread_cond_t output_cond; ///< Used by the main thread to wait for frames to finish.
92 pthread_mutex_t mutex; ///< Mutex used to protect the contents of the PerThreadContext.
93 pthread_mutex_t progress_mutex; ///< Mutex used to protect frame progress values and progress_cond.
95 AVCodecContext *avctx; ///< Context used to decode packets passed to this thread.
97 AVPacket avpkt; ///< Input packet (for decoding) or output (for encoding).
98 int allocated_buf_size; ///< Size allocated for avpkt.data
100 AVFrame frame; ///< Output frame (for decoding) or input (for encoding).
101 int got_frame; ///< The output of got_picture_ptr from the last avcodec_decode_video() call.
102 int result; ///< The result of the last codec decode/encode() call.
105 STATE_INPUT_READY, ///< Set when the thread is awaiting a packet.
106 STATE_SETTING_UP, ///< Set before the codec has called ff_thread_finish_setup().
107 STATE_GET_BUFFER, /**<
108 * Set when the codec calls get_buffer().
109 * State is returned to STATE_SETTING_UP afterwards.
111 STATE_SETUP_FINISHED ///< Set after the codec has called ff_thread_finish_setup().
115 * Array of frames passed to ff_thread_release_buffer().
116 * Frames are released after all threads referencing them are finished.
118 AVFrame released_buffers[MAX_BUFFERS];
119 int num_released_buffers;
122 * Array of progress values used by ff_thread_get_buffer().
124 int progress[MAX_BUFFERS][2];
125 uint8_t progress_used[MAX_BUFFERS];
127 AVFrame *requested_frame; ///< AVFrame the codec passed to get_buffer()
131 * Context stored in the client AVCodecContext thread_opaque.
133 typedef struct FrameThreadContext {
134 PerThreadContext *threads; ///< The contexts for each thread.
135 PerThreadContext *prev_thread; ///< The last thread submit_packet() was called on.
137 pthread_mutex_t buffer_mutex; ///< Mutex used to protect get/release_buffer().
139 int next_decoding; ///< The next context to submit a packet to.
140 int next_finished; ///< The next context to return output from.
143 * Set for the first N packets, where N is the number of threads.
144 * While it is set, ff_thread_en/decode_frame won't return any results.
147 int die; ///< Set when threads should exit.
148 } FrameThreadContext;
151 /* H264 slice threading seems to be buggy with more than 16 threads,
152 * limit the number of threads to 16 for automatic detection */
153 #define MAX_AUTO_THREADS 16
155 static int get_logical_cpus(AVCodecContext *avctx)
157 int ret, nb_cpus = 1;
158 #if HAVE_SCHED_GETAFFINITY && defined(CPU_COUNT)
163 ret = sched_getaffinity(0, sizeof(cpuset), &cpuset);
165 nb_cpus = CPU_COUNT(&cpuset);
167 #elif HAVE_GETSYSTEMINFO
169 GetSystemInfo(&sysinfo);
170 nb_cpus = sysinfo.dwNumberOfProcessors;
171 #elif HAVE_SYSCTL && defined(HW_NCPU)
172 int mib[2] = { CTL_HW, HW_NCPU };
173 size_t len = sizeof(nb_cpus);
175 ret = sysctl(mib, 2, &nb_cpus, &len, NULL, 0);
179 av_log(avctx, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
180 return FFMIN(nb_cpus, MAX_AUTO_THREADS);
184 static void* attribute_align_arg worker(void *v)
186 AVCodecContext *avctx = v;
187 ThreadContext *c = avctx->thread_opaque;
188 int our_job = c->job_count;
189 int thread_count = avctx->thread_count;
192 pthread_mutex_lock(&c->current_job_lock);
193 self_id = c->current_job++;
195 while (our_job >= c->job_count) {
196 if (c->current_job == thread_count + c->job_count)
197 pthread_cond_signal(&c->last_job_cond);
199 pthread_cond_wait(&c->current_job_cond, &c->current_job_lock);
203 pthread_mutex_unlock(&c->current_job_lock);
207 pthread_mutex_unlock(&c->current_job_lock);
209 c->rets[our_job%c->rets_count] = c->func ? c->func(avctx, (char*)c->args + our_job*c->job_size):
210 c->func2(avctx, c->args, our_job, self_id);
212 pthread_mutex_lock(&c->current_job_lock);
213 our_job = c->current_job++;
217 static av_always_inline void avcodec_thread_park_workers(ThreadContext *c, int thread_count)
219 pthread_cond_wait(&c->last_job_cond, &c->current_job_lock);
220 pthread_mutex_unlock(&c->current_job_lock);
223 static void thread_free(AVCodecContext *avctx)
225 ThreadContext *c = avctx->thread_opaque;
228 pthread_mutex_lock(&c->current_job_lock);
230 pthread_cond_broadcast(&c->current_job_cond);
231 pthread_mutex_unlock(&c->current_job_lock);
233 for (i=0; i<avctx->thread_count; i++)
234 pthread_join(c->workers[i], NULL);
236 pthread_mutex_destroy(&c->current_job_lock);
237 pthread_cond_destroy(&c->current_job_cond);
238 pthread_cond_destroy(&c->last_job_cond);
240 av_freep(&avctx->thread_opaque);
243 static int avcodec_thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size)
245 ThreadContext *c= avctx->thread_opaque;
248 if (!(avctx->active_thread_type&FF_THREAD_SLICE) || avctx->thread_count <= 1)
249 return avcodec_default_execute(avctx, func, arg, ret, job_count, job_size);
254 pthread_mutex_lock(&c->current_job_lock);
256 c->current_job = avctx->thread_count;
257 c->job_count = job_count;
258 c->job_size = job_size;
263 c->rets_count = job_count;
265 c->rets = &dummy_ret;
268 pthread_cond_broadcast(&c->current_job_cond);
270 avcodec_thread_park_workers(c, avctx->thread_count);
275 static int avcodec_thread_execute2(AVCodecContext *avctx, action_func2* func2, void *arg, int *ret, int job_count)
277 ThreadContext *c= avctx->thread_opaque;
279 return avcodec_thread_execute(avctx, NULL, arg, ret, job_count, 0);
282 static int thread_init(AVCodecContext *avctx)
286 int thread_count = avctx->thread_count;
289 int nb_cpus = get_logical_cpus(avctx);
290 // use number of cores + 1 as thread count if there is motre than one
292 thread_count = avctx->thread_count = nb_cpus + 1;
295 if (thread_count <= 1) {
296 avctx->active_thread_type = 0;
300 c = av_mallocz(sizeof(ThreadContext));
304 c->workers = av_mallocz(sizeof(pthread_t)*thread_count);
310 avctx->thread_opaque = c;
315 pthread_cond_init(&c->current_job_cond, NULL);
316 pthread_cond_init(&c->last_job_cond, NULL);
317 pthread_mutex_init(&c->current_job_lock, NULL);
318 pthread_mutex_lock(&c->current_job_lock);
319 for (i=0; i<thread_count; i++) {
320 if(pthread_create(&c->workers[i], NULL, worker, avctx)) {
321 avctx->thread_count = i;
322 pthread_mutex_unlock(&c->current_job_lock);
323 ff_thread_free(avctx);
328 avcodec_thread_park_workers(c, thread_count);
330 avctx->execute = avcodec_thread_execute;
331 avctx->execute2 = avcodec_thread_execute2;
336 * Codec worker thread.
338 * Automatically calls ff_thread_finish_setup() if the codec does
339 * not provide an update_thread_context method, or if the codec returns
342 static attribute_align_arg void *frame_worker_thread(void *arg)
344 PerThreadContext *p = arg;
345 FrameThreadContext *fctx = p->parent;
346 AVCodecContext *avctx = p->avctx;
347 AVCodec *codec = avctx->codec;
350 if (p->state == STATE_INPUT_READY && !fctx->die) {
351 pthread_mutex_lock(&p->mutex);
352 while (p->state == STATE_INPUT_READY && !fctx->die)
353 pthread_cond_wait(&p->input_cond, &p->mutex);
354 pthread_mutex_unlock(&p->mutex);
357 if (fctx->die) break;
359 if (!codec->update_thread_context && (avctx->thread_safe_callbacks || avctx->get_buffer == avcodec_default_get_buffer))
360 ff_thread_finish_setup(avctx);
362 pthread_mutex_lock(&p->mutex);
363 avcodec_get_frame_defaults(&p->frame);
365 p->result = codec->decode(avctx, &p->frame, &p->got_frame, &p->avpkt);
367 if (p->state == STATE_SETTING_UP) ff_thread_finish_setup(avctx);
369 p->state = STATE_INPUT_READY;
371 pthread_mutex_lock(&p->progress_mutex);
372 pthread_cond_signal(&p->output_cond);
373 pthread_mutex_unlock(&p->progress_mutex);
375 pthread_mutex_unlock(&p->mutex);
382 * Update the next thread's AVCodecContext with values from the reference thread's context.
384 * @param dst The destination context.
385 * @param src The source context.
386 * @param for_user 0 if the destination is a codec thread, 1 if the destination is the user's thread
388 static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src, int for_user)
393 dst->sub_id = src->sub_id;
394 dst->time_base = src->time_base;
395 dst->width = src->width;
396 dst->height = src->height;
397 dst->pix_fmt = src->pix_fmt;
399 dst->coded_width = src->coded_width;
400 dst->coded_height = src->coded_height;
402 dst->has_b_frames = src->has_b_frames;
403 dst->idct_algo = src->idct_algo;
404 dst->slice_count = src->slice_count;
406 dst->bits_per_coded_sample = src->bits_per_coded_sample;
407 dst->sample_aspect_ratio = src->sample_aspect_ratio;
408 dst->dtg_active_format = src->dtg_active_format;
410 dst->profile = src->profile;
411 dst->level = src->level;
413 dst->bits_per_raw_sample = src->bits_per_raw_sample;
414 dst->ticks_per_frame = src->ticks_per_frame;
415 dst->color_primaries = src->color_primaries;
417 dst->color_trc = src->color_trc;
418 dst->colorspace = src->colorspace;
419 dst->color_range = src->color_range;
420 dst->chroma_sample_location = src->chroma_sample_location;
424 dst->delay = src->thread_count - 1;
425 dst->coded_frame = src->coded_frame;
427 if (dst->codec->update_thread_context)
428 err = dst->codec->update_thread_context(dst, src);
435 * Update the next thread's AVCodecContext with values set by the user.
437 * @param dst The destination context.
438 * @param src The source context.
440 static void update_context_from_user(AVCodecContext *dst, AVCodecContext *src)
442 #define copy_fields(s, e) memcpy(&dst->s, &src->s, (char*)&dst->e - (char*)&dst->s);
443 dst->flags = src->flags;
445 dst->draw_horiz_band= src->draw_horiz_band;
446 dst->get_buffer = src->get_buffer;
447 dst->release_buffer = src->release_buffer;
449 dst->opaque = src->opaque;
450 dst->dsp_mask = src->dsp_mask;
451 dst->debug = src->debug;
452 dst->debug_mv = src->debug_mv;
454 dst->slice_flags = src->slice_flags;
455 dst->flags2 = src->flags2;
457 copy_fields(skip_loop_filter, bidir_refine);
459 dst->frame_number = src->frame_number;
460 dst->reordered_opaque = src->reordered_opaque;
461 dst->thread_safe_callbacks = src->thread_safe_callbacks;
465 static void free_progress(AVFrame *f)
467 PerThreadContext *p = f->owner->thread_opaque;
468 int *progress = f->thread_opaque;
470 p->progress_used[(progress - p->progress[0]) / 2] = 0;
473 /// Releases the buffers that this decoding thread was the last user of.
474 static void release_delayed_buffers(PerThreadContext *p)
476 FrameThreadContext *fctx = p->parent;
478 while (p->num_released_buffers > 0) {
481 pthread_mutex_lock(&fctx->buffer_mutex);
482 f = &p->released_buffers[--p->num_released_buffers];
484 f->thread_opaque = NULL;
486 f->owner->release_buffer(f->owner, f);
487 pthread_mutex_unlock(&fctx->buffer_mutex);
491 static int submit_packet(PerThreadContext *p, AVPacket *avpkt)
493 FrameThreadContext *fctx = p->parent;
494 PerThreadContext *prev_thread = fctx->prev_thread;
495 AVCodec *codec = p->avctx->codec;
496 uint8_t *buf = p->avpkt.data;
498 if (!avpkt->size && !(codec->capabilities & CODEC_CAP_DELAY)) return 0;
500 pthread_mutex_lock(&p->mutex);
502 release_delayed_buffers(p);
506 if (prev_thread->state == STATE_SETTING_UP) {
507 pthread_mutex_lock(&prev_thread->progress_mutex);
508 while (prev_thread->state == STATE_SETTING_UP)
509 pthread_cond_wait(&prev_thread->progress_cond, &prev_thread->progress_mutex);
510 pthread_mutex_unlock(&prev_thread->progress_mutex);
513 err = update_context_from_thread(p->avctx, prev_thread->avctx, 0);
515 pthread_mutex_unlock(&p->mutex);
520 av_fast_malloc(&buf, &p->allocated_buf_size, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
523 memcpy(buf, avpkt->data, avpkt->size);
524 memset(buf + avpkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
526 p->state = STATE_SETTING_UP;
527 pthread_cond_signal(&p->input_cond);
528 pthread_mutex_unlock(&p->mutex);
531 * If the client doesn't have a thread-safe get_buffer(),
532 * then decoding threads call back to the main thread,
533 * and it calls back to the client here.
536 if (!p->avctx->thread_safe_callbacks &&
537 p->avctx->get_buffer != avcodec_default_get_buffer) {
538 while (p->state != STATE_SETUP_FINISHED && p->state != STATE_INPUT_READY) {
539 pthread_mutex_lock(&p->progress_mutex);
540 while (p->state == STATE_SETTING_UP)
541 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
543 if (p->state == STATE_GET_BUFFER) {
544 p->result = p->avctx->get_buffer(p->avctx, p->requested_frame);
545 p->state = STATE_SETTING_UP;
546 pthread_cond_signal(&p->progress_cond);
548 pthread_mutex_unlock(&p->progress_mutex);
552 fctx->prev_thread = p;
553 fctx->next_decoding++;
558 int ff_thread_decode_frame(AVCodecContext *avctx,
559 AVFrame *picture, int *got_picture_ptr,
562 FrameThreadContext *fctx = avctx->thread_opaque;
563 int finished = fctx->next_finished;
568 * Submit a packet to the next decoding thread.
571 p = &fctx->threads[fctx->next_decoding];
572 update_context_from_user(p->avctx, avctx);
573 err = submit_packet(p, avpkt);
577 * If we're still receiving the initial packets, don't return a frame.
580 if (fctx->delaying && avpkt->size) {
581 if (fctx->next_decoding >= (avctx->thread_count-1)) fctx->delaying = 0;
588 * Return the next available frame from the oldest thread.
589 * If we're at the end of the stream, then we have to skip threads that
590 * didn't output a frame, because we don't want to accidentally signal
591 * EOF (avpkt->size == 0 && *got_picture_ptr == 0).
595 p = &fctx->threads[finished++];
597 if (p->state != STATE_INPUT_READY) {
598 pthread_mutex_lock(&p->progress_mutex);
599 while (p->state != STATE_INPUT_READY)
600 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
601 pthread_mutex_unlock(&p->progress_mutex);
605 *got_picture_ptr = p->got_frame;
606 picture->pkt_dts = p->avpkt.dts;
609 * A later call with avkpt->size == 0 may loop over all threads,
610 * including this one, searching for a frame to return before being
611 * stopped by the "finished != fctx->next_finished" condition.
612 * Make sure we don't mistakenly return the same frame again.
616 if (finished >= avctx->thread_count) finished = 0;
617 } while (!avpkt->size && !*got_picture_ptr && finished != fctx->next_finished);
619 update_context_from_thread(avctx, p->avctx, 1);
621 if (fctx->next_decoding >= avctx->thread_count) fctx->next_decoding = 0;
623 fctx->next_finished = finished;
625 /* return the size of the consumed packet if no error occurred */
626 return (p->result >= 0) ? avpkt->size : p->result;
629 void ff_thread_report_progress(AVFrame *f, int n, int field)
632 int *progress = f->thread_opaque;
634 if (!progress || progress[field] >= n) return;
636 p = f->owner->thread_opaque;
638 if (f->owner->debug&FF_DEBUG_THREADS)
639 av_log(f->owner, AV_LOG_DEBUG, "%p finished %d field %d\n", progress, n, field);
641 pthread_mutex_lock(&p->progress_mutex);
643 pthread_cond_broadcast(&p->progress_cond);
644 pthread_mutex_unlock(&p->progress_mutex);
647 void ff_thread_await_progress(AVFrame *f, int n, int field)
650 int *progress = f->thread_opaque;
652 if (!progress || progress[field] >= n) return;
654 p = f->owner->thread_opaque;
656 if (f->owner->debug&FF_DEBUG_THREADS)
657 av_log(f->owner, AV_LOG_DEBUG, "thread awaiting %d field %d from %p\n", n, field, progress);
659 pthread_mutex_lock(&p->progress_mutex);
660 while (progress[field] < n)
661 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
662 pthread_mutex_unlock(&p->progress_mutex);
665 void ff_thread_finish_setup(AVCodecContext *avctx) {
666 PerThreadContext *p = avctx->thread_opaque;
668 if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
670 if(p->state == STATE_SETUP_FINISHED){
671 av_log(avctx, AV_LOG_WARNING, "Multiple ff_thread_finish_setup() calls\n");
674 pthread_mutex_lock(&p->progress_mutex);
675 p->state = STATE_SETUP_FINISHED;
676 pthread_cond_broadcast(&p->progress_cond);
677 pthread_mutex_unlock(&p->progress_mutex);
680 /// Waits for all threads to finish.
681 static void park_frame_worker_threads(FrameThreadContext *fctx, int thread_count)
685 for (i = 0; i < thread_count; i++) {
686 PerThreadContext *p = &fctx->threads[i];
688 if (p->state != STATE_INPUT_READY) {
689 pthread_mutex_lock(&p->progress_mutex);
690 while (p->state != STATE_INPUT_READY)
691 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
692 pthread_mutex_unlock(&p->progress_mutex);
697 static void frame_thread_free(AVCodecContext *avctx, int thread_count)
699 FrameThreadContext *fctx = avctx->thread_opaque;
700 AVCodec *codec = avctx->codec;
703 park_frame_worker_threads(fctx, thread_count);
705 if (fctx->prev_thread && fctx->prev_thread != fctx->threads)
706 update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0);
710 for (i = 0; i < thread_count; i++) {
711 PerThreadContext *p = &fctx->threads[i];
713 pthread_mutex_lock(&p->mutex);
714 pthread_cond_signal(&p->input_cond);
715 pthread_mutex_unlock(&p->mutex);
718 pthread_join(p->thread, NULL);
722 codec->close(p->avctx);
726 release_delayed_buffers(p);
729 for (i = 0; i < thread_count; i++) {
730 PerThreadContext *p = &fctx->threads[i];
732 avcodec_default_free_buffers(p->avctx);
734 pthread_mutex_destroy(&p->mutex);
735 pthread_mutex_destroy(&p->progress_mutex);
736 pthread_cond_destroy(&p->input_cond);
737 pthread_cond_destroy(&p->progress_cond);
738 pthread_cond_destroy(&p->output_cond);
739 av_freep(&p->avpkt.data);
742 av_freep(&p->avctx->priv_data);
743 av_freep(&p->avctx->internal);
749 av_freep(&fctx->threads);
750 pthread_mutex_destroy(&fctx->buffer_mutex);
751 av_freep(&avctx->thread_opaque);
754 static int frame_thread_init(AVCodecContext *avctx)
756 int thread_count = avctx->thread_count;
757 AVCodec *codec = avctx->codec;
758 AVCodecContext *src = avctx;
759 FrameThreadContext *fctx;
763 int nb_cpus = get_logical_cpus(avctx);
764 // use number of cores + 1 as thread count if there is motre than one
766 thread_count = avctx->thread_count = nb_cpus + 1;
769 if (thread_count <= 1) {
770 avctx->active_thread_type = 0;
774 avctx->thread_opaque = fctx = av_mallocz(sizeof(FrameThreadContext));
776 fctx->threads = av_mallocz(sizeof(PerThreadContext) * thread_count);
777 pthread_mutex_init(&fctx->buffer_mutex, NULL);
780 for (i = 0; i < thread_count; i++) {
781 AVCodecContext *copy = av_malloc(sizeof(AVCodecContext));
782 PerThreadContext *p = &fctx->threads[i];
784 pthread_mutex_init(&p->mutex, NULL);
785 pthread_mutex_init(&p->progress_mutex, NULL);
786 pthread_cond_init(&p->input_cond, NULL);
787 pthread_cond_init(&p->progress_cond, NULL);
788 pthread_cond_init(&p->output_cond, NULL);
794 err = AVERROR(ENOMEM);
799 copy->thread_opaque = p;
800 copy->pkt = &p->avpkt;
806 err = codec->init(copy);
808 update_context_from_thread(avctx, copy, 1);
810 copy->priv_data = av_malloc(codec->priv_data_size);
811 if (!copy->priv_data) {
812 err = AVERROR(ENOMEM);
815 memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
816 copy->internal = av_malloc(sizeof(AVCodecInternal));
817 if (!copy->internal) {
818 err = AVERROR(ENOMEM);
821 *(copy->internal) = *(src->internal);
822 copy->internal->is_copy = 1;
824 if (codec->init_thread_copy)
825 err = codec->init_thread_copy(copy);
830 p->thread_init= !pthread_create(&p->thread, NULL, frame_worker_thread, p);
838 frame_thread_free(avctx, i+1);
843 void ff_thread_flush(AVCodecContext *avctx)
845 FrameThreadContext *fctx = avctx->thread_opaque;
847 if (!avctx->thread_opaque) return;
849 park_frame_worker_threads(fctx, avctx->thread_count);
850 if (fctx->prev_thread) {
851 if (fctx->prev_thread != &fctx->threads[0])
852 update_context_from_thread(fctx->threads[0].avctx, fctx->prev_thread->avctx, 0);
853 if (avctx->codec->flush)
854 avctx->codec->flush(fctx->threads[0].avctx);
857 fctx->next_decoding = fctx->next_finished = 0;
859 fctx->prev_thread = NULL;
862 static int *allocate_progress(PerThreadContext *p)
866 for (i = 0; i < MAX_BUFFERS; i++)
867 if (!p->progress_used[i]) break;
869 if (i == MAX_BUFFERS) {
870 av_log(p->avctx, AV_LOG_ERROR, "allocate_progress() overflow\n");
874 p->progress_used[i] = 1;
876 return p->progress[i];
879 int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f)
881 PerThreadContext *p = avctx->thread_opaque;
886 ff_init_buffer_info(avctx, f);
888 if (!(avctx->active_thread_type&FF_THREAD_FRAME)) {
889 f->thread_opaque = NULL;
890 return avctx->get_buffer(avctx, f);
893 if (p->state != STATE_SETTING_UP &&
894 (avctx->codec->update_thread_context || (!avctx->thread_safe_callbacks &&
895 avctx->get_buffer != avcodec_default_get_buffer))) {
896 av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
900 pthread_mutex_lock(&p->parent->buffer_mutex);
901 f->thread_opaque = progress = allocate_progress(p);
904 pthread_mutex_unlock(&p->parent->buffer_mutex);
911 if (avctx->thread_safe_callbacks ||
912 avctx->get_buffer == avcodec_default_get_buffer) {
913 err = avctx->get_buffer(avctx, f);
915 p->requested_frame = f;
916 p->state = STATE_GET_BUFFER;
917 pthread_mutex_lock(&p->progress_mutex);
918 pthread_cond_signal(&p->progress_cond);
920 while (p->state != STATE_SETTING_UP)
921 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
925 pthread_mutex_unlock(&p->progress_mutex);
927 if (!avctx->codec->update_thread_context)
928 ff_thread_finish_setup(avctx);
931 pthread_mutex_unlock(&p->parent->buffer_mutex);
936 void ff_thread_release_buffer(AVCodecContext *avctx, AVFrame *f)
938 PerThreadContext *p = avctx->thread_opaque;
939 FrameThreadContext *fctx;
941 if (!(avctx->active_thread_type&FF_THREAD_FRAME)) {
942 avctx->release_buffer(avctx, f);
946 if (p->num_released_buffers >= MAX_BUFFERS) {
947 av_log(p->avctx, AV_LOG_ERROR, "too many thread_release_buffer calls!\n");
951 if(avctx->debug & FF_DEBUG_BUFFERS)
952 av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p\n", f);
955 pthread_mutex_lock(&fctx->buffer_mutex);
956 p->released_buffers[p->num_released_buffers++] = *f;
957 pthread_mutex_unlock(&fctx->buffer_mutex);
958 memset(f->data, 0, sizeof(f->data));
962 * Set the threading algorithms used.
964 * Threading requires more than one thread.
965 * Frame threading requires entire frames to be passed to the codec,
966 * and introduces extra decoding delay, so is incompatible with low_delay.
968 * @param avctx The context.
970 static void validate_thread_parameters(AVCodecContext *avctx)
972 int frame_threading_supported = (avctx->codec->capabilities & CODEC_CAP_FRAME_THREADS)
973 && !(avctx->flags & CODEC_FLAG_TRUNCATED)
974 && !(avctx->flags & CODEC_FLAG_LOW_DELAY)
975 && !(avctx->flags2 & CODEC_FLAG2_CHUNKS);
976 if (avctx->thread_count == 1) {
977 avctx->active_thread_type = 0;
978 } else if (frame_threading_supported && (avctx->thread_type & FF_THREAD_FRAME)) {
979 avctx->active_thread_type = FF_THREAD_FRAME;
980 } else if (avctx->codec->capabilities & CODEC_CAP_SLICE_THREADS &&
981 avctx->thread_type & FF_THREAD_SLICE) {
982 avctx->active_thread_type = FF_THREAD_SLICE;
986 int ff_thread_init(AVCodecContext *avctx)
988 if (avctx->thread_opaque) {
989 av_log(avctx, AV_LOG_ERROR, "avcodec_thread_init is ignored after avcodec_open\n");
998 validate_thread_parameters(avctx);
1000 if (avctx->active_thread_type&FF_THREAD_SLICE)
1001 return thread_init(avctx);
1002 else if (avctx->active_thread_type&FF_THREAD_FRAME)
1003 return frame_thread_init(avctx);
1009 void ff_thread_free(AVCodecContext *avctx)
1011 if (avctx->active_thread_type&FF_THREAD_FRAME)
1012 frame_thread_free(avctx, avctx->thread_count);