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 Libav.
11 * Libav 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 * Libav 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 Libav; 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_GETSYSTEMINFO
43 #include <sys/param.h>
45 #include <sys/types.h>
46 #include <sys/sysctl.h>
56 #include "w32pthreads.h"
59 typedef int (action_func)(AVCodecContext *c, void *arg);
60 typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr);
62 typedef struct ThreadContext {
72 pthread_cond_t last_job_cond;
73 pthread_cond_t current_job_cond;
74 pthread_mutex_t current_job_lock;
79 /// Max number of frame buffers that can be allocated when using frame threads.
80 #define MAX_BUFFERS (32+1)
83 * Context used by codec threads and stored in their AVCodecContext thread_opaque.
85 typedef struct PerThreadContext {
86 struct FrameThreadContext *parent;
90 pthread_cond_t input_cond; ///< Used to wait for a new packet from the main thread.
91 pthread_cond_t progress_cond; ///< Used by child threads to wait for progress to change.
92 pthread_cond_t output_cond; ///< Used by the main thread to wait for frames to finish.
94 pthread_mutex_t mutex; ///< Mutex used to protect the contents of the PerThreadContext.
95 pthread_mutex_t progress_mutex; ///< Mutex used to protect frame progress values and progress_cond.
97 AVCodecContext *avctx; ///< Context used to decode packets passed to this thread.
99 AVPacket avpkt; ///< Input packet (for decoding) or output (for encoding).
100 int allocated_buf_size; ///< Size allocated for avpkt.data
102 AVFrame frame; ///< Output frame (for decoding) or input (for encoding).
103 int got_frame; ///< The output of got_picture_ptr from the last avcodec_decode_video() call.
104 int result; ///< The result of the last codec decode/encode() call.
107 STATE_INPUT_READY, ///< Set when the thread is awaiting a packet.
108 STATE_SETTING_UP, ///< Set before the codec has called ff_thread_finish_setup().
109 STATE_GET_BUFFER, /**<
110 * Set when the codec calls get_buffer().
111 * State is returned to STATE_SETTING_UP afterwards.
113 STATE_SETUP_FINISHED ///< Set after the codec has called ff_thread_finish_setup().
117 * Array of frames passed to ff_thread_release_buffer().
118 * Frames are released after all threads referencing them are finished.
120 AVFrame released_buffers[MAX_BUFFERS];
121 int num_released_buffers;
124 * Array of progress values used by ff_thread_get_buffer().
126 int progress[MAX_BUFFERS][2];
127 uint8_t progress_used[MAX_BUFFERS];
129 AVFrame *requested_frame; ///< AVFrame the codec passed to get_buffer()
133 * Context stored in the client AVCodecContext thread_opaque.
135 typedef struct FrameThreadContext {
136 PerThreadContext *threads; ///< The contexts for each thread.
137 PerThreadContext *prev_thread; ///< The last thread submit_packet() was called on.
139 pthread_mutex_t buffer_mutex; ///< Mutex used to protect get/release_buffer().
141 int next_decoding; ///< The next context to submit a packet to.
142 int next_finished; ///< The next context to return output from.
145 * Set for the first N packets, where N is the number of threads.
146 * While it is set, ff_thread_en/decode_frame won't return any results.
149 int die; ///< Set when threads should exit.
150 } FrameThreadContext;
153 /* H264 slice threading seems to be buggy with more than 16 threads,
154 * limit the number of threads to 16 for automatic detection */
155 #define MAX_AUTO_THREADS 16
157 static int get_logical_cpus(AVCodecContext *avctx)
159 int ret, nb_cpus = 1;
160 #if HAVE_SCHED_GETAFFINITY && defined(CPU_COUNT)
165 ret = sched_getaffinity(0, sizeof(cpuset), &cpuset);
167 nb_cpus = CPU_COUNT(&cpuset);
169 #elif HAVE_GETSYSTEMINFO
171 GetSystemInfo(&sysinfo);
172 nb_cpus = sysinfo.dwNumberOfProcessors;
173 #elif HAVE_SYSCTL && defined(HW_NCPU)
174 int mib[2] = { CTL_HW, HW_NCPU };
175 size_t len = sizeof(nb_cpus);
177 ret = sysctl(mib, 2, &nb_cpus, &len, NULL, 0);
181 av_log(avctx, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
182 return FFMIN(nb_cpus, MAX_AUTO_THREADS);
186 static void* attribute_align_arg worker(void *v)
188 AVCodecContext *avctx = v;
189 ThreadContext *c = avctx->thread_opaque;
190 int our_job = c->job_count;
191 int thread_count = avctx->thread_count;
194 pthread_mutex_lock(&c->current_job_lock);
195 self_id = c->current_job++;
197 while (our_job >= c->job_count) {
198 if (c->current_job == thread_count + c->job_count)
199 pthread_cond_signal(&c->last_job_cond);
201 pthread_cond_wait(&c->current_job_cond, &c->current_job_lock);
205 pthread_mutex_unlock(&c->current_job_lock);
209 pthread_mutex_unlock(&c->current_job_lock);
211 c->rets[our_job%c->rets_count] = c->func ? c->func(avctx, (char*)c->args + our_job*c->job_size):
212 c->func2(avctx, c->args, our_job, self_id);
214 pthread_mutex_lock(&c->current_job_lock);
215 our_job = c->current_job++;
219 static av_always_inline void avcodec_thread_park_workers(ThreadContext *c, int thread_count)
221 pthread_cond_wait(&c->last_job_cond, &c->current_job_lock);
222 pthread_mutex_unlock(&c->current_job_lock);
225 static void thread_free(AVCodecContext *avctx)
227 ThreadContext *c = avctx->thread_opaque;
230 pthread_mutex_lock(&c->current_job_lock);
232 pthread_cond_broadcast(&c->current_job_cond);
233 pthread_mutex_unlock(&c->current_job_lock);
235 for (i=0; i<avctx->thread_count; i++)
236 pthread_join(c->workers[i], NULL);
238 pthread_mutex_destroy(&c->current_job_lock);
239 pthread_cond_destroy(&c->current_job_cond);
240 pthread_cond_destroy(&c->last_job_cond);
242 av_freep(&avctx->thread_opaque);
245 static int avcodec_thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size)
247 ThreadContext *c= avctx->thread_opaque;
250 if (!(avctx->active_thread_type&FF_THREAD_SLICE) || avctx->thread_count <= 1)
251 return avcodec_default_execute(avctx, func, arg, ret, job_count, job_size);
256 pthread_mutex_lock(&c->current_job_lock);
258 c->current_job = avctx->thread_count;
259 c->job_count = job_count;
260 c->job_size = job_size;
265 c->rets_count = job_count;
267 c->rets = &dummy_ret;
270 pthread_cond_broadcast(&c->current_job_cond);
272 avcodec_thread_park_workers(c, avctx->thread_count);
277 static int avcodec_thread_execute2(AVCodecContext *avctx, action_func2* func2, void *arg, int *ret, int job_count)
279 ThreadContext *c= avctx->thread_opaque;
281 return avcodec_thread_execute(avctx, NULL, arg, ret, job_count, 0);
284 static int thread_init(AVCodecContext *avctx)
288 int thread_count = avctx->thread_count;
291 int nb_cpus = get_logical_cpus(avctx);
292 // use number of cores + 1 as thread count if there is motre than one
294 thread_count = avctx->thread_count = nb_cpus + 1;
297 if (thread_count <= 1) {
298 avctx->active_thread_type = 0;
302 c = av_mallocz(sizeof(ThreadContext));
306 c->workers = av_mallocz(sizeof(pthread_t)*thread_count);
312 avctx->thread_opaque = c;
317 pthread_cond_init(&c->current_job_cond, NULL);
318 pthread_cond_init(&c->last_job_cond, NULL);
319 pthread_mutex_init(&c->current_job_lock, NULL);
320 pthread_mutex_lock(&c->current_job_lock);
321 for (i=0; i<thread_count; i++) {
322 if(pthread_create(&c->workers[i], NULL, worker, avctx)) {
323 avctx->thread_count = i;
324 pthread_mutex_unlock(&c->current_job_lock);
325 ff_thread_free(avctx);
330 avcodec_thread_park_workers(c, thread_count);
332 avctx->execute = avcodec_thread_execute;
333 avctx->execute2 = avcodec_thread_execute2;
338 * Codec worker thread.
340 * Automatically calls ff_thread_finish_setup() if the codec does
341 * not provide an update_thread_context method, or if the codec returns
344 static attribute_align_arg void *frame_worker_thread(void *arg)
346 PerThreadContext *p = arg;
347 FrameThreadContext *fctx = p->parent;
348 AVCodecContext *avctx = p->avctx;
349 AVCodec *codec = avctx->codec;
352 if (p->state == STATE_INPUT_READY && !fctx->die) {
353 pthread_mutex_lock(&p->mutex);
354 while (p->state == STATE_INPUT_READY && !fctx->die)
355 pthread_cond_wait(&p->input_cond, &p->mutex);
356 pthread_mutex_unlock(&p->mutex);
359 if (fctx->die) break;
361 if (!codec->update_thread_context && avctx->thread_safe_callbacks)
362 ff_thread_finish_setup(avctx);
364 pthread_mutex_lock(&p->mutex);
365 avcodec_get_frame_defaults(&p->frame);
367 p->result = codec->decode(avctx, &p->frame, &p->got_frame, &p->avpkt);
369 if (p->state == STATE_SETTING_UP) ff_thread_finish_setup(avctx);
371 p->state = STATE_INPUT_READY;
373 pthread_mutex_lock(&p->progress_mutex);
374 pthread_cond_signal(&p->output_cond);
375 pthread_mutex_unlock(&p->progress_mutex);
377 pthread_mutex_unlock(&p->mutex);
384 * Update the next thread's AVCodecContext with values from the reference thread's context.
386 * @param dst The destination context.
387 * @param src The source context.
388 * @param for_user 0 if the destination is a codec thread, 1 if the destination is the user's thread
390 static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src, int for_user)
395 dst->sub_id = src->sub_id;
396 dst->time_base = src->time_base;
397 dst->width = src->width;
398 dst->height = src->height;
399 dst->pix_fmt = src->pix_fmt;
401 dst->coded_width = src->coded_width;
402 dst->coded_height = src->coded_height;
404 dst->has_b_frames = src->has_b_frames;
405 dst->idct_algo = src->idct_algo;
406 dst->slice_count = src->slice_count;
408 dst->bits_per_coded_sample = src->bits_per_coded_sample;
409 dst->sample_aspect_ratio = src->sample_aspect_ratio;
410 dst->dtg_active_format = src->dtg_active_format;
412 dst->profile = src->profile;
413 dst->level = src->level;
415 dst->bits_per_raw_sample = src->bits_per_raw_sample;
416 dst->ticks_per_frame = src->ticks_per_frame;
417 dst->color_primaries = src->color_primaries;
419 dst->color_trc = src->color_trc;
420 dst->colorspace = src->colorspace;
421 dst->color_range = src->color_range;
422 dst->chroma_sample_location = src->chroma_sample_location;
426 dst->coded_frame = src->coded_frame;
428 if (dst->codec->update_thread_context)
429 err = dst->codec->update_thread_context(dst, src);
436 * Update the next thread's AVCodecContext with values set by the user.
438 * @param dst The destination context.
439 * @param src The source context.
441 static void update_context_from_user(AVCodecContext *dst, AVCodecContext *src)
443 #define copy_fields(s, e) memcpy(&dst->s, &src->s, (char*)&dst->e - (char*)&dst->s);
444 dst->flags = src->flags;
446 dst->draw_horiz_band= src->draw_horiz_band;
447 dst->get_buffer = src->get_buffer;
448 dst->release_buffer = src->release_buffer;
450 dst->opaque = src->opaque;
451 dst->dsp_mask = src->dsp_mask;
452 dst->debug = src->debug;
453 dst->debug_mv = src->debug_mv;
455 dst->slice_flags = src->slice_flags;
456 dst->flags2 = src->flags2;
458 copy_fields(skip_loop_filter, bidir_refine);
460 dst->frame_number = src->frame_number;
461 dst->reordered_opaque = src->reordered_opaque;
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;
607 picture->sample_aspect_ratio = avctx->sample_aspect_ratio;
608 picture->width = avctx->width;
609 picture->height = avctx->height;
610 picture->format = avctx->pix_fmt;
613 * A later call with avkpt->size == 0 may loop over all threads,
614 * including this one, searching for a frame to return before being
615 * stopped by the "finished != fctx->next_finished" condition.
616 * Make sure we don't mistakenly return the same frame again.
620 if (finished >= avctx->thread_count) finished = 0;
621 } while (!avpkt->size && !*got_picture_ptr && finished != fctx->next_finished);
623 update_context_from_thread(avctx, p->avctx, 1);
625 if (fctx->next_decoding >= avctx->thread_count) fctx->next_decoding = 0;
627 fctx->next_finished = finished;
629 /* return the size of the consumed packet if no error occurred */
630 return (p->result >= 0) ? avpkt->size : p->result;
633 void ff_thread_report_progress(AVFrame *f, int n, int field)
636 int *progress = f->thread_opaque;
638 if (!progress || progress[field] >= n) return;
640 p = f->owner->thread_opaque;
642 if (f->owner->debug&FF_DEBUG_THREADS)
643 av_log(f->owner, AV_LOG_DEBUG, "%p finished %d field %d\n", progress, n, field);
645 pthread_mutex_lock(&p->progress_mutex);
647 pthread_cond_broadcast(&p->progress_cond);
648 pthread_mutex_unlock(&p->progress_mutex);
651 void ff_thread_await_progress(AVFrame *f, int n, int field)
654 int *progress = f->thread_opaque;
656 if (!progress || progress[field] >= n) return;
658 p = f->owner->thread_opaque;
660 if (f->owner->debug&FF_DEBUG_THREADS)
661 av_log(f->owner, AV_LOG_DEBUG, "thread awaiting %d field %d from %p\n", n, field, progress);
663 pthread_mutex_lock(&p->progress_mutex);
664 while (progress[field] < n)
665 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
666 pthread_mutex_unlock(&p->progress_mutex);
669 void ff_thread_finish_setup(AVCodecContext *avctx) {
670 PerThreadContext *p = avctx->thread_opaque;
672 if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
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);
721 codec->close(p->avctx);
725 release_delayed_buffers(p);
728 for (i = 0; i < thread_count; i++) {
729 PerThreadContext *p = &fctx->threads[i];
731 avcodec_default_free_buffers(p->avctx);
733 pthread_mutex_destroy(&p->mutex);
734 pthread_mutex_destroy(&p->progress_mutex);
735 pthread_cond_destroy(&p->input_cond);
736 pthread_cond_destroy(&p->progress_cond);
737 pthread_cond_destroy(&p->output_cond);
738 av_freep(&p->avpkt.data);
741 av_freep(&p->avctx->priv_data);
742 av_freep(&p->avctx->internal);
748 av_freep(&fctx->threads);
749 pthread_mutex_destroy(&fctx->buffer_mutex);
750 av_freep(&avctx->thread_opaque);
753 static int frame_thread_init(AVCodecContext *avctx)
755 int thread_count = avctx->thread_count;
756 AVCodec *codec = avctx->codec;
757 AVCodecContext *src = avctx;
758 FrameThreadContext *fctx;
762 int nb_cpus = get_logical_cpus(avctx);
763 // use number of cores + 1 as thread count if there is motre than one
765 thread_count = avctx->thread_count = nb_cpus + 1;
768 if (thread_count <= 1) {
769 avctx->active_thread_type = 0;
773 avctx->thread_opaque = fctx = av_mallocz(sizeof(FrameThreadContext));
775 fctx->threads = av_mallocz(sizeof(PerThreadContext) * thread_count);
776 pthread_mutex_init(&fctx->buffer_mutex, NULL);
779 for (i = 0; i < thread_count; i++) {
780 AVCodecContext *copy = av_malloc(sizeof(AVCodecContext));
781 PerThreadContext *p = &fctx->threads[i];
783 pthread_mutex_init(&p->mutex, NULL);
784 pthread_mutex_init(&p->progress_mutex, NULL);
785 pthread_cond_init(&p->input_cond, NULL);
786 pthread_cond_init(&p->progress_cond, NULL);
787 pthread_cond_init(&p->output_cond, NULL);
793 err = AVERROR(ENOMEM);
798 copy->thread_opaque = p;
799 copy->pkt = &p->avpkt;
805 err = codec->init(copy);
807 update_context_from_thread(avctx, copy, 1);
809 copy->priv_data = av_malloc(codec->priv_data_size);
810 if (!copy->priv_data) {
811 err = AVERROR(ENOMEM);
814 memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
815 copy->internal = av_malloc(sizeof(AVCodecInternal));
816 if (!copy->internal) {
817 err = AVERROR(ENOMEM);
820 *(copy->internal) = *(src->internal);
821 copy->internal->is_copy = 1;
823 if (codec->init_thread_copy)
824 err = codec->init_thread_copy(copy);
829 if (!pthread_create(&p->thread, NULL, frame_worker_thread, p))
836 frame_thread_free(avctx, i+1);
841 void ff_thread_flush(AVCodecContext *avctx)
843 FrameThreadContext *fctx = avctx->thread_opaque;
845 if (!avctx->thread_opaque) return;
847 park_frame_worker_threads(fctx, avctx->thread_count);
848 if (fctx->prev_thread) {
849 if (fctx->prev_thread != &fctx->threads[0])
850 update_context_from_thread(fctx->threads[0].avctx, fctx->prev_thread->avctx, 0);
851 if (avctx->codec->flush)
852 avctx->codec->flush(fctx->threads[0].avctx);
855 fctx->next_decoding = fctx->next_finished = 0;
857 fctx->prev_thread = NULL;
860 static int *allocate_progress(PerThreadContext *p)
864 for (i = 0; i < MAX_BUFFERS; i++)
865 if (!p->progress_used[i]) break;
867 if (i == MAX_BUFFERS) {
868 av_log(p->avctx, AV_LOG_ERROR, "allocate_progress() overflow\n");
872 p->progress_used[i] = 1;
874 return p->progress[i];
877 int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f)
879 PerThreadContext *p = avctx->thread_opaque;
884 if (!(avctx->active_thread_type&FF_THREAD_FRAME)) {
885 f->thread_opaque = NULL;
886 return avctx->get_buffer(avctx, f);
889 if (p->state != STATE_SETTING_UP &&
890 (avctx->codec->update_thread_context || !avctx->thread_safe_callbacks)) {
891 av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
895 pthread_mutex_lock(&p->parent->buffer_mutex);
896 f->thread_opaque = progress = allocate_progress(p);
899 pthread_mutex_unlock(&p->parent->buffer_mutex);
906 if (avctx->thread_safe_callbacks ||
907 avctx->get_buffer == avcodec_default_get_buffer) {
908 err = avctx->get_buffer(avctx, f);
910 p->requested_frame = f;
911 p->state = STATE_GET_BUFFER;
912 pthread_mutex_lock(&p->progress_mutex);
913 pthread_cond_signal(&p->progress_cond);
915 while (p->state != STATE_SETTING_UP)
916 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
920 pthread_mutex_unlock(&p->progress_mutex);
922 if (!avctx->codec->update_thread_context)
923 ff_thread_finish_setup(avctx);
926 pthread_mutex_unlock(&p->parent->buffer_mutex);
931 void ff_thread_release_buffer(AVCodecContext *avctx, AVFrame *f)
933 PerThreadContext *p = avctx->thread_opaque;
934 FrameThreadContext *fctx;
936 if (!(avctx->active_thread_type&FF_THREAD_FRAME)) {
937 avctx->release_buffer(avctx, f);
941 if (p->num_released_buffers >= MAX_BUFFERS) {
942 av_log(p->avctx, AV_LOG_ERROR, "too many thread_release_buffer calls!\n");
946 if(avctx->debug & FF_DEBUG_BUFFERS)
947 av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p\n", f);
950 pthread_mutex_lock(&fctx->buffer_mutex);
951 p->released_buffers[p->num_released_buffers++] = *f;
952 pthread_mutex_unlock(&fctx->buffer_mutex);
953 memset(f->data, 0, sizeof(f->data));
957 * Set the threading algorithms used.
959 * Threading requires more than one thread.
960 * Frame threading requires entire frames to be passed to the codec,
961 * and introduces extra decoding delay, so is incompatible with low_delay.
963 * @param avctx The context.
965 static void validate_thread_parameters(AVCodecContext *avctx)
967 int frame_threading_supported = (avctx->codec->capabilities & CODEC_CAP_FRAME_THREADS)
968 && !(avctx->flags & CODEC_FLAG_TRUNCATED)
969 && !(avctx->flags & CODEC_FLAG_LOW_DELAY)
970 && !(avctx->flags2 & CODEC_FLAG2_CHUNKS);
971 if (avctx->thread_count == 1) {
972 avctx->active_thread_type = 0;
973 } else if (frame_threading_supported && (avctx->thread_type & FF_THREAD_FRAME)) {
974 avctx->active_thread_type = FF_THREAD_FRAME;
975 } else if (avctx->codec->capabilities & CODEC_CAP_SLICE_THREADS &&
976 avctx->thread_type & FF_THREAD_SLICE) {
977 avctx->active_thread_type = FF_THREAD_SLICE;
981 int ff_thread_init(AVCodecContext *avctx)
983 if (avctx->thread_opaque) {
984 av_log(avctx, AV_LOG_ERROR, "avcodec_thread_init is ignored after avcodec_open\n");
993 validate_thread_parameters(avctx);
995 if (avctx->active_thread_type&FF_THREAD_SLICE)
996 return thread_init(avctx);
997 else if (avctx->active_thread_type&FF_THREAD_FRAME)
998 return frame_thread_init(avctx);
1004 void ff_thread_free(AVCodecContext *avctx)
1006 if (avctx->active_thread_type&FF_THREAD_FRAME)
1007 frame_thread_free(avctx, avctx->thread_count);