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
38 #if HAVE_GETPROCESSAFFINITYMASK
43 #include <sys/param.h>
45 #include <sys/types.h>
46 #include <sys/param.h>
47 #include <sys/sysctl.h>
56 #include "libavutil/common.h"
61 #include "w32pthreads.h"
63 #include "os2threads.h"
66 typedef int (action_func)(AVCodecContext *c, void *arg);
67 typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr);
69 typedef struct ThreadContext {
79 pthread_cond_t last_job_cond;
80 pthread_cond_t current_job_cond;
81 pthread_mutex_t current_job_lock;
86 /// Max number of frame buffers that can be allocated when using frame threads.
87 #define MAX_BUFFERS (32+1)
90 * Context used by codec threads and stored in their AVCodecContext thread_opaque.
92 typedef struct PerThreadContext {
93 struct FrameThreadContext *parent;
97 pthread_cond_t input_cond; ///< Used to wait for a new packet from the main thread.
98 pthread_cond_t progress_cond; ///< Used by child threads to wait for progress to change.
99 pthread_cond_t output_cond; ///< Used by the main thread to wait for frames to finish.
101 pthread_mutex_t mutex; ///< Mutex used to protect the contents of the PerThreadContext.
102 pthread_mutex_t progress_mutex; ///< Mutex used to protect frame progress values and progress_cond.
104 AVCodecContext *avctx; ///< Context used to decode packets passed to this thread.
106 AVPacket avpkt; ///< Input packet (for decoding) or output (for encoding).
107 int allocated_buf_size; ///< Size allocated for avpkt.data
109 AVFrame frame; ///< Output frame (for decoding) or input (for encoding).
110 int got_frame; ///< The output of got_picture_ptr from the last avcodec_decode_video() call.
111 int result; ///< The result of the last codec decode/encode() call.
114 STATE_INPUT_READY, ///< Set when the thread is awaiting a packet.
115 STATE_SETTING_UP, ///< Set before the codec has called ff_thread_finish_setup().
116 STATE_GET_BUFFER, /**<
117 * Set when the codec calls get_buffer().
118 * State is returned to STATE_SETTING_UP afterwards.
120 STATE_SETUP_FINISHED ///< Set after the codec has called ff_thread_finish_setup().
124 * Array of frames passed to ff_thread_release_buffer().
125 * Frames are released after all threads referencing them are finished.
127 AVFrame released_buffers[MAX_BUFFERS];
128 int num_released_buffers;
131 * Array of progress values used by ff_thread_get_buffer().
133 volatile int progress[MAX_BUFFERS][2];
134 volatile uint8_t progress_used[MAX_BUFFERS];
136 AVFrame *requested_frame; ///< AVFrame the codec passed to get_buffer()
140 * Context stored in the client AVCodecContext thread_opaque.
142 typedef struct FrameThreadContext {
143 PerThreadContext *threads; ///< The contexts for each thread.
144 PerThreadContext *prev_thread; ///< The last thread submit_packet() was called on.
146 pthread_mutex_t buffer_mutex; ///< Mutex used to protect get/release_buffer().
148 int next_decoding; ///< The next context to submit a packet to.
149 int next_finished; ///< The next context to return output from.
152 * Set for the first N packets, where N is the number of threads.
153 * While it is set, ff_thread_en/decode_frame won't return any results.
156 int die; ///< Set when threads should exit.
157 } FrameThreadContext;
160 /* H264 slice threading seems to be buggy with more than 16 threads,
161 * limit the number of threads to 16 for automatic detection */
162 #define MAX_AUTO_THREADS 16
164 int ff_get_logical_cpus(AVCodecContext *avctx)
166 int ret, nb_cpus = 1;
167 #if HAVE_SCHED_GETAFFINITY && defined(CPU_COUNT)
172 ret = sched_getaffinity(0, sizeof(cpuset), &cpuset);
174 nb_cpus = CPU_COUNT(&cpuset);
176 #elif HAVE_GETPROCESSAFFINITYMASK
177 DWORD_PTR proc_aff, sys_aff;
178 ret = GetProcessAffinityMask(GetCurrentProcess(), &proc_aff, &sys_aff);
180 nb_cpus = av_popcount64(proc_aff);
181 #elif HAVE_SYSCTL && defined(HW_NCPU)
182 int mib[2] = { CTL_HW, HW_NCPU };
183 size_t len = sizeof(nb_cpus);
185 ret = sysctl(mib, 2, &nb_cpus, &len, NULL, 0);
188 #elif HAVE_SYSCONF && defined(_SC_NPROC_ONLN)
189 nb_cpus = sysconf(_SC_NPROC_ONLN);
190 #elif HAVE_SYSCONF && defined(_SC_NPROCESSORS_ONLN)
191 nb_cpus = sysconf(_SC_NPROCESSORS_ONLN);
193 av_log(avctx, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
196 nb_cpus = FFMIN(nb_cpus, (avctx->height+15)/16);
202 static void* attribute_align_arg worker(void *v)
204 AVCodecContext *avctx = v;
205 ThreadContext *c = avctx->thread_opaque;
206 int our_job = c->job_count;
207 int thread_count = avctx->thread_count;
210 pthread_mutex_lock(&c->current_job_lock);
211 self_id = c->current_job++;
213 while (our_job >= c->job_count) {
214 if (c->current_job == thread_count + c->job_count)
215 pthread_cond_signal(&c->last_job_cond);
217 pthread_cond_wait(&c->current_job_cond, &c->current_job_lock);
221 pthread_mutex_unlock(&c->current_job_lock);
225 pthread_mutex_unlock(&c->current_job_lock);
227 c->rets[our_job%c->rets_count] = c->func ? c->func(avctx, (char*)c->args + our_job*c->job_size):
228 c->func2(avctx, c->args, our_job, self_id);
230 pthread_mutex_lock(&c->current_job_lock);
231 our_job = c->current_job++;
235 static av_always_inline void avcodec_thread_park_workers(ThreadContext *c, int thread_count)
237 pthread_cond_wait(&c->last_job_cond, &c->current_job_lock);
238 pthread_mutex_unlock(&c->current_job_lock);
241 static void thread_free(AVCodecContext *avctx)
243 ThreadContext *c = avctx->thread_opaque;
246 pthread_mutex_lock(&c->current_job_lock);
248 pthread_cond_broadcast(&c->current_job_cond);
249 pthread_mutex_unlock(&c->current_job_lock);
251 for (i=0; i<avctx->thread_count; i++)
252 pthread_join(c->workers[i], NULL);
254 pthread_mutex_destroy(&c->current_job_lock);
255 pthread_cond_destroy(&c->current_job_cond);
256 pthread_cond_destroy(&c->last_job_cond);
258 av_freep(&avctx->thread_opaque);
261 static int avcodec_thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size)
263 ThreadContext *c= avctx->thread_opaque;
266 if (!(avctx->active_thread_type&FF_THREAD_SLICE) || avctx->thread_count <= 1)
267 return avcodec_default_execute(avctx, func, arg, ret, job_count, job_size);
272 pthread_mutex_lock(&c->current_job_lock);
274 c->current_job = avctx->thread_count;
275 c->job_count = job_count;
276 c->job_size = job_size;
281 c->rets_count = job_count;
283 c->rets = &dummy_ret;
286 pthread_cond_broadcast(&c->current_job_cond);
288 avcodec_thread_park_workers(c, avctx->thread_count);
293 static int avcodec_thread_execute2(AVCodecContext *avctx, action_func2* func2, void *arg, int *ret, int job_count)
295 ThreadContext *c= avctx->thread_opaque;
297 return avcodec_thread_execute(avctx, NULL, arg, ret, job_count, 0);
300 static int thread_init(AVCodecContext *avctx)
304 int thread_count = avctx->thread_count;
307 int nb_cpus = ff_get_logical_cpus(avctx);
308 // use number of cores + 1 as thread count if there is more than one
310 thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
312 thread_count = avctx->thread_count = 1;
315 if (thread_count <= 1) {
316 avctx->active_thread_type = 0;
320 c = av_mallocz(sizeof(ThreadContext));
324 c->workers = av_mallocz(sizeof(pthread_t)*thread_count);
330 avctx->thread_opaque = c;
335 pthread_cond_init(&c->current_job_cond, NULL);
336 pthread_cond_init(&c->last_job_cond, NULL);
337 pthread_mutex_init(&c->current_job_lock, NULL);
338 pthread_mutex_lock(&c->current_job_lock);
339 for (i=0; i<thread_count; i++) {
340 if(pthread_create(&c->workers[i], NULL, worker, avctx)) {
341 avctx->thread_count = i;
342 pthread_mutex_unlock(&c->current_job_lock);
343 ff_thread_free(avctx);
348 avcodec_thread_park_workers(c, thread_count);
350 avctx->execute = avcodec_thread_execute;
351 avctx->execute2 = avcodec_thread_execute2;
356 * Codec worker thread.
358 * Automatically calls ff_thread_finish_setup() if the codec does
359 * not provide an update_thread_context method, or if the codec returns
362 static attribute_align_arg void *frame_worker_thread(void *arg)
364 PerThreadContext *p = arg;
365 FrameThreadContext *fctx = p->parent;
366 AVCodecContext *avctx = p->avctx;
367 AVCodec *codec = avctx->codec;
369 pthread_mutex_lock(&p->mutex);
372 while (p->state == STATE_INPUT_READY && !fctx->die)
373 pthread_cond_wait(&p->input_cond, &p->mutex);
375 if (fctx->die) break;
377 if (!codec->update_thread_context && (avctx->thread_safe_callbacks || avctx->get_buffer == avcodec_default_get_buffer))
378 ff_thread_finish_setup(avctx);
380 avcodec_get_frame_defaults(&p->frame);
382 p->result = codec->decode(avctx, &p->frame, &p->got_frame, &p->avpkt);
384 if (p->state == STATE_SETTING_UP) ff_thread_finish_setup(avctx);
386 pthread_mutex_lock(&p->progress_mutex);
387 for (i = 0; i < MAX_BUFFERS; i++)
388 if (p->progress_used[i] && (p->got_frame || p->result<0 || avctx->codec_id != AV_CODEC_ID_H264)) {
389 p->progress[i][0] = INT_MAX;
390 p->progress[i][1] = INT_MAX;
392 p->state = STATE_INPUT_READY;
394 pthread_cond_broadcast(&p->progress_cond);
395 pthread_cond_signal(&p->output_cond);
396 pthread_mutex_unlock(&p->progress_mutex);
398 pthread_mutex_unlock(&p->mutex);
404 * Update the next thread's AVCodecContext with values from the reference thread's context.
406 * @param dst The destination context.
407 * @param src The source context.
408 * @param for_user 0 if the destination is a codec thread, 1 if the destination is the user's thread
410 static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src, int for_user)
415 dst->time_base = src->time_base;
416 dst->width = src->width;
417 dst->height = src->height;
418 dst->pix_fmt = src->pix_fmt;
420 dst->coded_width = src->coded_width;
421 dst->coded_height = src->coded_height;
423 dst->has_b_frames = src->has_b_frames;
424 dst->idct_algo = src->idct_algo;
426 dst->bits_per_coded_sample = src->bits_per_coded_sample;
427 dst->sample_aspect_ratio = src->sample_aspect_ratio;
428 dst->dtg_active_format = src->dtg_active_format;
430 dst->profile = src->profile;
431 dst->level = src->level;
433 dst->bits_per_raw_sample = src->bits_per_raw_sample;
434 dst->ticks_per_frame = src->ticks_per_frame;
435 dst->color_primaries = src->color_primaries;
437 dst->color_trc = src->color_trc;
438 dst->colorspace = src->colorspace;
439 dst->color_range = src->color_range;
440 dst->chroma_sample_location = src->chroma_sample_location;
444 dst->delay = src->thread_count - 1;
445 dst->coded_frame = src->coded_frame;
447 if (dst->codec->update_thread_context)
448 err = dst->codec->update_thread_context(dst, src);
455 * Update the next thread's AVCodecContext with values set by the user.
457 * @param dst The destination context.
458 * @param src The source context.
459 * @return 0 on success, negative error code on failure
461 static int update_context_from_user(AVCodecContext *dst, AVCodecContext *src)
463 #define copy_fields(s, e) memcpy(&dst->s, &src->s, (char*)&dst->e - (char*)&dst->s);
464 dst->flags = src->flags;
466 dst->draw_horiz_band= src->draw_horiz_band;
467 dst->get_buffer = src->get_buffer;
468 dst->release_buffer = src->release_buffer;
470 dst->opaque = src->opaque;
471 dst->debug = src->debug;
472 dst->debug_mv = src->debug_mv;
474 dst->slice_flags = src->slice_flags;
475 dst->flags2 = src->flags2;
477 copy_fields(skip_loop_filter, subtitle_header);
479 dst->frame_number = src->frame_number;
480 dst->reordered_opaque = src->reordered_opaque;
481 dst->thread_safe_callbacks = src->thread_safe_callbacks;
483 if (src->slice_count && src->slice_offset) {
484 if (dst->slice_count < src->slice_count) {
485 int *tmp = av_realloc(dst->slice_offset, src->slice_count *
486 sizeof(*dst->slice_offset));
488 av_free(dst->slice_offset);
489 return AVERROR(ENOMEM);
491 dst->slice_offset = tmp;
493 memcpy(dst->slice_offset, src->slice_offset,
494 src->slice_count * sizeof(*dst->slice_offset));
496 dst->slice_count = src->slice_count;
501 static void free_progress(AVFrame *f)
503 PerThreadContext *p = f->owner->thread_opaque;
504 volatile int *progress = f->thread_opaque;
506 p->progress_used[(progress - p->progress[0]) / 2] = 0;
509 /// Releases the buffers that this decoding thread was the last user of.
510 static void release_delayed_buffers(PerThreadContext *p)
512 FrameThreadContext *fctx = p->parent;
514 while (p->num_released_buffers > 0) {
517 pthread_mutex_lock(&fctx->buffer_mutex);
518 f = &p->released_buffers[--p->num_released_buffers];
520 f->thread_opaque = NULL;
522 f->owner->release_buffer(f->owner, f);
523 pthread_mutex_unlock(&fctx->buffer_mutex);
527 static int submit_packet(PerThreadContext *p, AVPacket *avpkt)
529 FrameThreadContext *fctx = p->parent;
530 PerThreadContext *prev_thread = fctx->prev_thread;
531 AVCodec *codec = p->avctx->codec;
532 uint8_t *buf = p->avpkt.data;
534 if (!avpkt->size && !(codec->capabilities & CODEC_CAP_DELAY)) return 0;
536 pthread_mutex_lock(&p->mutex);
538 release_delayed_buffers(p);
542 if (prev_thread->state == STATE_SETTING_UP) {
543 pthread_mutex_lock(&prev_thread->progress_mutex);
544 while (prev_thread->state == STATE_SETTING_UP)
545 pthread_cond_wait(&prev_thread->progress_cond, &prev_thread->progress_mutex);
546 pthread_mutex_unlock(&prev_thread->progress_mutex);
549 err = update_context_from_thread(p->avctx, prev_thread->avctx, 0);
551 pthread_mutex_unlock(&p->mutex);
556 av_fast_malloc(&buf, &p->allocated_buf_size, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
559 memcpy(buf, avpkt->data, avpkt->size);
560 memset(buf + avpkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
562 p->state = STATE_SETTING_UP;
563 pthread_cond_signal(&p->input_cond);
564 pthread_mutex_unlock(&p->mutex);
567 * If the client doesn't have a thread-safe get_buffer(),
568 * then decoding threads call back to the main thread,
569 * and it calls back to the client here.
572 if (!p->avctx->thread_safe_callbacks &&
573 p->avctx->get_buffer != avcodec_default_get_buffer) {
574 while (p->state != STATE_SETUP_FINISHED && p->state != STATE_INPUT_READY) {
575 pthread_mutex_lock(&p->progress_mutex);
576 while (p->state == STATE_SETTING_UP)
577 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
579 if (p->state == STATE_GET_BUFFER) {
580 p->result = p->avctx->get_buffer(p->avctx, p->requested_frame);
581 p->state = STATE_SETTING_UP;
582 pthread_cond_signal(&p->progress_cond);
584 pthread_mutex_unlock(&p->progress_mutex);
588 fctx->prev_thread = p;
589 fctx->next_decoding++;
594 int ff_thread_decode_frame(AVCodecContext *avctx,
595 AVFrame *picture, int *got_picture_ptr,
598 FrameThreadContext *fctx = avctx->thread_opaque;
599 int finished = fctx->next_finished;
604 * Submit a packet to the next decoding thread.
607 p = &fctx->threads[fctx->next_decoding];
608 err = update_context_from_user(p->avctx, avctx);
610 err = submit_packet(p, avpkt);
614 * If we're still receiving the initial packets, don't return a frame.
617 if (fctx->delaying) {
618 if (fctx->next_decoding >= (avctx->thread_count-1)) fctx->delaying = 0;
626 * Return the next available frame from the oldest thread.
627 * If we're at the end of the stream, then we have to skip threads that
628 * didn't output a frame, because we don't want to accidentally signal
629 * EOF (avpkt->size == 0 && *got_picture_ptr == 0).
633 p = &fctx->threads[finished++];
635 if (p->state != STATE_INPUT_READY) {
636 pthread_mutex_lock(&p->progress_mutex);
637 while (p->state != STATE_INPUT_READY)
638 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
639 pthread_mutex_unlock(&p->progress_mutex);
643 *got_picture_ptr = p->got_frame;
644 picture->pkt_dts = p->avpkt.dts;
647 * A later call with avkpt->size == 0 may loop over all threads,
648 * including this one, searching for a frame to return before being
649 * stopped by the "finished != fctx->next_finished" condition.
650 * Make sure we don't mistakenly return the same frame again.
654 if (finished >= avctx->thread_count) finished = 0;
655 } while (!avpkt->size && !*got_picture_ptr && finished != fctx->next_finished);
657 update_context_from_thread(avctx, p->avctx, 1);
659 if (fctx->next_decoding >= avctx->thread_count) fctx->next_decoding = 0;
661 fctx->next_finished = finished;
663 /* return the size of the consumed packet if no error occurred */
664 return (p->result >= 0) ? avpkt->size : p->result;
667 void ff_thread_report_progress(AVFrame *f, int n, int field)
670 volatile int *progress = f->thread_opaque;
672 if (!progress || progress[field] >= n) return;
674 p = f->owner->thread_opaque;
676 if (f->owner->debug&FF_DEBUG_THREADS)
677 av_log(f->owner, AV_LOG_DEBUG, "%p finished %d field %d\n", progress, n, field);
679 pthread_mutex_lock(&p->progress_mutex);
681 pthread_cond_broadcast(&p->progress_cond);
682 pthread_mutex_unlock(&p->progress_mutex);
685 void ff_thread_await_progress(AVFrame *f, int n, int field)
688 volatile int *progress = f->thread_opaque;
690 if (!progress || progress[field] >= n) return;
692 p = f->owner->thread_opaque;
694 if (f->owner->debug&FF_DEBUG_THREADS)
695 av_log(f->owner, AV_LOG_DEBUG, "thread awaiting %d field %d from %p\n", n, field, progress);
697 pthread_mutex_lock(&p->progress_mutex);
698 while (progress[field] < n)
699 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
700 pthread_mutex_unlock(&p->progress_mutex);
703 void ff_thread_finish_setup(AVCodecContext *avctx) {
704 PerThreadContext *p = avctx->thread_opaque;
706 if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
708 if(p->state == STATE_SETUP_FINISHED){
709 av_log(avctx, AV_LOG_WARNING, "Multiple ff_thread_finish_setup() calls\n");
712 pthread_mutex_lock(&p->progress_mutex);
713 p->state = STATE_SETUP_FINISHED;
714 pthread_cond_broadcast(&p->progress_cond);
715 pthread_mutex_unlock(&p->progress_mutex);
718 /// Waits for all threads to finish.
719 static void park_frame_worker_threads(FrameThreadContext *fctx, int thread_count)
723 for (i = 0; i < thread_count; i++) {
724 PerThreadContext *p = &fctx->threads[i];
726 if (p->state != STATE_INPUT_READY) {
727 pthread_mutex_lock(&p->progress_mutex);
728 while (p->state != STATE_INPUT_READY)
729 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
730 pthread_mutex_unlock(&p->progress_mutex);
736 static void frame_thread_free(AVCodecContext *avctx, int thread_count)
738 FrameThreadContext *fctx = avctx->thread_opaque;
739 AVCodec *codec = avctx->codec;
742 park_frame_worker_threads(fctx, thread_count);
744 if (fctx->prev_thread && fctx->prev_thread != fctx->threads)
745 update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0);
749 for (i = 0; i < thread_count; i++) {
750 PerThreadContext *p = &fctx->threads[i];
752 pthread_mutex_lock(&p->mutex);
753 pthread_cond_signal(&p->input_cond);
754 pthread_mutex_unlock(&p->mutex);
757 pthread_join(p->thread, NULL);
761 codec->close(p->avctx);
765 release_delayed_buffers(p);
768 for (i = 0; i < thread_count; i++) {
769 PerThreadContext *p = &fctx->threads[i];
771 avcodec_default_free_buffers(p->avctx);
773 pthread_mutex_destroy(&p->mutex);
774 pthread_mutex_destroy(&p->progress_mutex);
775 pthread_cond_destroy(&p->input_cond);
776 pthread_cond_destroy(&p->progress_cond);
777 pthread_cond_destroy(&p->output_cond);
778 av_freep(&p->avpkt.data);
781 av_freep(&p->avctx->priv_data);
782 av_freep(&p->avctx->internal);
783 av_freep(&p->avctx->slice_offset);
789 av_freep(&fctx->threads);
790 pthread_mutex_destroy(&fctx->buffer_mutex);
791 av_freep(&avctx->thread_opaque);
794 static int frame_thread_init(AVCodecContext *avctx)
796 int thread_count = avctx->thread_count;
797 AVCodec *codec = avctx->codec;
798 AVCodecContext *src = avctx;
799 FrameThreadContext *fctx;
803 int nb_cpus = ff_get_logical_cpus(avctx);
804 if ((avctx->debug & (FF_DEBUG_VIS_QP | FF_DEBUG_VIS_MB_TYPE)) || avctx->debug_mv)
806 // use number of cores + 1 as thread count if there is more than one
808 thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
810 thread_count = avctx->thread_count = 1;
813 if (thread_count <= 1) {
814 avctx->active_thread_type = 0;
818 avctx->thread_opaque = fctx = av_mallocz(sizeof(FrameThreadContext));
820 fctx->threads = av_mallocz(sizeof(PerThreadContext) * thread_count);
821 pthread_mutex_init(&fctx->buffer_mutex, NULL);
824 for (i = 0; i < thread_count; i++) {
825 AVCodecContext *copy = av_malloc(sizeof(AVCodecContext));
826 PerThreadContext *p = &fctx->threads[i];
828 pthread_mutex_init(&p->mutex, NULL);
829 pthread_mutex_init(&p->progress_mutex, NULL);
830 pthread_cond_init(&p->input_cond, NULL);
831 pthread_cond_init(&p->progress_cond, NULL);
832 pthread_cond_init(&p->output_cond, NULL);
838 err = AVERROR(ENOMEM);
843 copy->thread_opaque = p;
844 copy->pkt = &p->avpkt;
850 err = codec->init(copy);
852 update_context_from_thread(avctx, copy, 1);
854 copy->priv_data = av_malloc(codec->priv_data_size);
855 if (!copy->priv_data) {
856 err = AVERROR(ENOMEM);
859 memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
860 copy->internal = av_malloc(sizeof(AVCodecInternal));
861 if (!copy->internal) {
862 err = AVERROR(ENOMEM);
865 *copy->internal = *src->internal;
866 copy->internal->is_copy = 1;
868 if (codec->init_thread_copy)
869 err = codec->init_thread_copy(copy);
874 err = AVERROR(pthread_create(&p->thread, NULL, frame_worker_thread, p));
875 p->thread_init= !err;
883 frame_thread_free(avctx, i+1);
888 void ff_thread_flush(AVCodecContext *avctx)
891 FrameThreadContext *fctx = avctx->thread_opaque;
893 if (!avctx->thread_opaque) return;
895 park_frame_worker_threads(fctx, avctx->thread_count);
896 if (fctx->prev_thread) {
897 if (fctx->prev_thread != &fctx->threads[0])
898 update_context_from_thread(fctx->threads[0].avctx, fctx->prev_thread->avctx, 0);
899 if (avctx->codec->flush)
900 avctx->codec->flush(fctx->threads[0].avctx);
903 fctx->next_decoding = fctx->next_finished = 0;
905 fctx->prev_thread = NULL;
906 for (i = 0; i < avctx->thread_count; i++) {
907 PerThreadContext *p = &fctx->threads[i];
908 // Make sure decode flush calls with size=0 won't return old frames
911 release_delayed_buffers(p);
915 static volatile int *allocate_progress(PerThreadContext *p)
919 for (i = 0; i < MAX_BUFFERS; i++)
920 if (!p->progress_used[i]) break;
922 if (i == MAX_BUFFERS) {
923 av_log(p->avctx, AV_LOG_ERROR, "allocate_progress() overflow\n");
927 p->progress_used[i] = 1;
929 return p->progress[i];
932 int ff_thread_can_start_frame(AVCodecContext *avctx)
934 PerThreadContext *p = avctx->thread_opaque;
935 if ((avctx->active_thread_type&FF_THREAD_FRAME) && p->state != STATE_SETTING_UP &&
936 (avctx->codec->update_thread_context || (!avctx->thread_safe_callbacks &&
937 avctx->get_buffer != avcodec_default_get_buffer))) {
943 int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f)
945 PerThreadContext *p = avctx->thread_opaque;
947 volatile int *progress;
951 ff_init_buffer_info(avctx, f);
953 if (!(avctx->active_thread_type&FF_THREAD_FRAME)) {
954 f->thread_opaque = NULL;
955 return avctx->get_buffer(avctx, f);
958 if (p->state != STATE_SETTING_UP &&
959 (avctx->codec->update_thread_context || (!avctx->thread_safe_callbacks &&
960 avctx->get_buffer != avcodec_default_get_buffer))) {
961 av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
965 pthread_mutex_lock(&p->parent->buffer_mutex);
966 f->thread_opaque = (int*)(progress = allocate_progress(p));
969 pthread_mutex_unlock(&p->parent->buffer_mutex);
976 if (avctx->thread_safe_callbacks ||
977 avctx->get_buffer == avcodec_default_get_buffer) {
978 err = avctx->get_buffer(avctx, f);
980 pthread_mutex_lock(&p->progress_mutex);
981 p->requested_frame = f;
982 p->state = STATE_GET_BUFFER;
983 pthread_cond_broadcast(&p->progress_cond);
985 while (p->state != STATE_SETTING_UP)
986 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
990 pthread_mutex_unlock(&p->progress_mutex);
992 if (!avctx->codec->update_thread_context)
993 ff_thread_finish_setup(avctx);
998 f->thread_opaque = NULL;
1000 pthread_mutex_unlock(&p->parent->buffer_mutex);
1005 void ff_thread_release_buffer(AVCodecContext *avctx, AVFrame *f)
1007 PerThreadContext *p = avctx->thread_opaque;
1008 FrameThreadContext *fctx;
1010 if (!(avctx->active_thread_type&FF_THREAD_FRAME)) {
1011 avctx->release_buffer(avctx, f);
1015 if (p->num_released_buffers >= MAX_BUFFERS) {
1016 av_log(p->avctx, AV_LOG_ERROR, "too many thread_release_buffer calls!\n");
1020 if(avctx->debug & FF_DEBUG_BUFFERS)
1021 av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p\n", f);
1024 pthread_mutex_lock(&fctx->buffer_mutex);
1025 p->released_buffers[p->num_released_buffers++] = *f;
1026 pthread_mutex_unlock(&fctx->buffer_mutex);
1027 memset(f->data, 0, sizeof(f->data));
1031 * Set the threading algorithms used.
1033 * Threading requires more than one thread.
1034 * Frame threading requires entire frames to be passed to the codec,
1035 * and introduces extra decoding delay, so is incompatible with low_delay.
1037 * @param avctx The context.
1039 static void validate_thread_parameters(AVCodecContext *avctx)
1041 int frame_threading_supported = (avctx->codec->capabilities & CODEC_CAP_FRAME_THREADS)
1042 && !(avctx->flags & CODEC_FLAG_TRUNCATED)
1043 && !(avctx->flags & CODEC_FLAG_LOW_DELAY)
1044 && !(avctx->flags2 & CODEC_FLAG2_CHUNKS);
1045 if (avctx->thread_count == 1) {
1046 avctx->active_thread_type = 0;
1047 } else if (frame_threading_supported && (avctx->thread_type & FF_THREAD_FRAME)) {
1048 avctx->active_thread_type = FF_THREAD_FRAME;
1049 } else if (avctx->codec->capabilities & CODEC_CAP_SLICE_THREADS &&
1050 avctx->thread_type & FF_THREAD_SLICE) {
1051 avctx->active_thread_type = FF_THREAD_SLICE;
1052 } else if (!(avctx->codec->capabilities & CODEC_CAP_AUTO_THREADS)) {
1053 avctx->thread_count = 1;
1054 avctx->active_thread_type = 0;
1057 if (avctx->thread_count > MAX_AUTO_THREADS)
1058 av_log(avctx, AV_LOG_WARNING,
1059 "Application has requested %d threads. Using a thread count greater than %d is not recommended.\n",
1060 avctx->thread_count, MAX_AUTO_THREADS);
1063 int ff_thread_init(AVCodecContext *avctx)
1065 if (avctx->thread_opaque) {
1066 av_log(avctx, AV_LOG_ERROR, "avcodec_thread_init is ignored after avcodec_open\n");
1075 validate_thread_parameters(avctx);
1077 if (avctx->active_thread_type&FF_THREAD_SLICE)
1078 return thread_init(avctx);
1079 else if (avctx->active_thread_type&FF_THREAD_FRAME)
1080 return frame_thread_init(avctx);
1086 void ff_thread_free(AVCodecContext *avctx)
1088 if (avctx->active_thread_type&FF_THREAD_FRAME)
1089 frame_thread_free(avctx, avctx->thread_count);