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_GETPROCESSAFFINITYMASK
43 #include <sys/param.h>
45 #include <sys/types.h>
46 #include <sys/sysctl.h>
59 #include "w32pthreads.h"
62 typedef int (action_func)(AVCodecContext *c, void *arg);
63 typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr);
65 typedef struct ThreadContext {
75 pthread_cond_t last_job_cond;
76 pthread_cond_t current_job_cond;
77 pthread_mutex_t current_job_lock;
82 /// Max number of frame buffers that can be allocated when using frame threads.
83 #define MAX_BUFFERS (32+1)
86 * Context used by codec threads and stored in their AVCodecContext thread_opaque.
88 typedef struct PerThreadContext {
89 struct FrameThreadContext *parent;
93 pthread_cond_t input_cond; ///< Used to wait for a new packet from the main thread.
94 pthread_cond_t progress_cond; ///< Used by child threads to wait for progress to change.
95 pthread_cond_t output_cond; ///< Used by the main thread to wait for frames to finish.
97 pthread_mutex_t mutex; ///< Mutex used to protect the contents of the PerThreadContext.
98 pthread_mutex_t progress_mutex; ///< Mutex used to protect frame progress values and progress_cond.
100 AVCodecContext *avctx; ///< Context used to decode packets passed to this thread.
102 AVPacket avpkt; ///< Input packet (for decoding) or output (for encoding).
103 int allocated_buf_size; ///< Size allocated for avpkt.data
105 AVFrame frame; ///< Output frame (for decoding) or input (for encoding).
106 int got_frame; ///< The output of got_picture_ptr from the last avcodec_decode_video() call.
107 int result; ///< The result of the last codec decode/encode() call.
110 STATE_INPUT_READY, ///< Set when the thread is awaiting a packet.
111 STATE_SETTING_UP, ///< Set before the codec has called ff_thread_finish_setup().
112 STATE_GET_BUFFER, /**<
113 * Set when the codec calls get_buffer().
114 * State is returned to STATE_SETTING_UP afterwards.
116 STATE_SETUP_FINISHED ///< Set after the codec has called ff_thread_finish_setup().
120 * Array of frames passed to ff_thread_release_buffer().
121 * Frames are released after all threads referencing them are finished.
123 AVFrame released_buffers[MAX_BUFFERS];
124 int num_released_buffers;
127 * Array of progress values used by ff_thread_get_buffer().
129 int progress[MAX_BUFFERS][2];
130 uint8_t progress_used[MAX_BUFFERS];
132 AVFrame *requested_frame; ///< AVFrame the codec passed to get_buffer()
136 * Context stored in the client AVCodecContext thread_opaque.
138 typedef struct FrameThreadContext {
139 PerThreadContext *threads; ///< The contexts for each thread.
140 PerThreadContext *prev_thread; ///< The last thread submit_packet() was called on.
142 pthread_mutex_t buffer_mutex; ///< Mutex used to protect get/release_buffer().
144 int next_decoding; ///< The next context to submit a packet to.
145 int next_finished; ///< The next context to return output from.
148 * Set for the first N packets, where N is the number of threads.
149 * While it is set, ff_thread_en/decode_frame won't return any results.
152 int die; ///< Set when threads should exit.
153 } FrameThreadContext;
156 /* H264 slice threading seems to be buggy with more than 16 threads,
157 * limit the number of threads to 16 for automatic detection */
158 #define MAX_AUTO_THREADS 16
160 static int get_logical_cpus(AVCodecContext *avctx)
162 int ret, nb_cpus = 1;
163 #if HAVE_SCHED_GETAFFINITY && defined(CPU_COUNT)
168 ret = sched_getaffinity(0, sizeof(cpuset), &cpuset);
170 nb_cpus = CPU_COUNT(&cpuset);
172 #elif HAVE_GETPROCESSAFFINITYMASK
173 DWORD_PTR proc_aff, sys_aff;
174 ret = GetProcessAffinityMask(GetCurrentProcess(), &proc_aff, &sys_aff);
176 nb_cpus = av_popcount64(proc_aff);
177 #elif HAVE_SYSCTL && defined(HW_NCPU)
178 int mib[2] = { CTL_HW, HW_NCPU };
179 size_t len = sizeof(nb_cpus);
181 ret = sysctl(mib, 2, &nb_cpus, &len, NULL, 0);
184 #elif HAVE_SYSCONF && defined(_SC_NPROC_ONLN)
185 nb_cpus = sysconf(_SC_NPROC_ONLN);
186 #elif HAVE_SYSCONF && defined(_SC_NPROCESSORS_ONLN)
187 nb_cpus = sysconf(_SC_NPROCESSORS_ONLN);
189 av_log(avctx, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
194 static void* attribute_align_arg worker(void *v)
196 AVCodecContext *avctx = v;
197 ThreadContext *c = avctx->thread_opaque;
198 int our_job = c->job_count;
199 int thread_count = avctx->thread_count;
202 pthread_mutex_lock(&c->current_job_lock);
203 self_id = c->current_job++;
205 while (our_job >= c->job_count) {
206 if (c->current_job == thread_count + c->job_count)
207 pthread_cond_signal(&c->last_job_cond);
209 pthread_cond_wait(&c->current_job_cond, &c->current_job_lock);
213 pthread_mutex_unlock(&c->current_job_lock);
217 pthread_mutex_unlock(&c->current_job_lock);
219 c->rets[our_job%c->rets_count] = c->func ? c->func(avctx, (char*)c->args + our_job*c->job_size):
220 c->func2(avctx, c->args, our_job, self_id);
222 pthread_mutex_lock(&c->current_job_lock);
223 our_job = c->current_job++;
227 static av_always_inline void avcodec_thread_park_workers(ThreadContext *c, int thread_count)
229 pthread_cond_wait(&c->last_job_cond, &c->current_job_lock);
230 pthread_mutex_unlock(&c->current_job_lock);
233 static void thread_free(AVCodecContext *avctx)
235 ThreadContext *c = avctx->thread_opaque;
238 pthread_mutex_lock(&c->current_job_lock);
240 pthread_cond_broadcast(&c->current_job_cond);
241 pthread_mutex_unlock(&c->current_job_lock);
243 for (i=0; i<avctx->thread_count; i++)
244 pthread_join(c->workers[i], NULL);
246 pthread_mutex_destroy(&c->current_job_lock);
247 pthread_cond_destroy(&c->current_job_cond);
248 pthread_cond_destroy(&c->last_job_cond);
250 av_freep(&avctx->thread_opaque);
253 static int avcodec_thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size)
255 ThreadContext *c= avctx->thread_opaque;
258 if (!(avctx->active_thread_type&FF_THREAD_SLICE) || avctx->thread_count <= 1)
259 return avcodec_default_execute(avctx, func, arg, ret, job_count, job_size);
264 pthread_mutex_lock(&c->current_job_lock);
266 c->current_job = avctx->thread_count;
267 c->job_count = job_count;
268 c->job_size = job_size;
273 c->rets_count = job_count;
275 c->rets = &dummy_ret;
278 pthread_cond_broadcast(&c->current_job_cond);
280 avcodec_thread_park_workers(c, avctx->thread_count);
285 static int avcodec_thread_execute2(AVCodecContext *avctx, action_func2* func2, void *arg, int *ret, int job_count)
287 ThreadContext *c= avctx->thread_opaque;
289 return avcodec_thread_execute(avctx, NULL, arg, ret, job_count, 0);
292 static int thread_init(AVCodecContext *avctx)
296 int thread_count = avctx->thread_count;
299 int nb_cpus = get_logical_cpus(avctx);
300 // use number of cores + 1 as thread count if there is more than one
302 thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
304 thread_count = avctx->thread_count = 1;
307 if (thread_count <= 1) {
308 avctx->active_thread_type = 0;
312 c = av_mallocz(sizeof(ThreadContext));
316 c->workers = av_mallocz(sizeof(pthread_t)*thread_count);
322 avctx->thread_opaque = c;
327 pthread_cond_init(&c->current_job_cond, NULL);
328 pthread_cond_init(&c->last_job_cond, NULL);
329 pthread_mutex_init(&c->current_job_lock, NULL);
330 pthread_mutex_lock(&c->current_job_lock);
331 for (i=0; i<thread_count; i++) {
332 if(pthread_create(&c->workers[i], NULL, worker, avctx)) {
333 avctx->thread_count = i;
334 pthread_mutex_unlock(&c->current_job_lock);
335 ff_thread_free(avctx);
340 avcodec_thread_park_workers(c, thread_count);
342 avctx->execute = avcodec_thread_execute;
343 avctx->execute2 = avcodec_thread_execute2;
348 * Codec worker thread.
350 * Automatically calls ff_thread_finish_setup() if the codec does
351 * not provide an update_thread_context method, or if the codec returns
354 static attribute_align_arg void *frame_worker_thread(void *arg)
356 PerThreadContext *p = arg;
357 FrameThreadContext *fctx = p->parent;
358 AVCodecContext *avctx = p->avctx;
359 AVCodec *codec = avctx->codec;
362 if (p->state == STATE_INPUT_READY && !fctx->die) {
363 pthread_mutex_lock(&p->mutex);
364 while (p->state == STATE_INPUT_READY && !fctx->die)
365 pthread_cond_wait(&p->input_cond, &p->mutex);
366 pthread_mutex_unlock(&p->mutex);
369 if (fctx->die) break;
371 if (!codec->update_thread_context && avctx->thread_safe_callbacks)
372 ff_thread_finish_setup(avctx);
374 pthread_mutex_lock(&p->mutex);
375 avcodec_get_frame_defaults(&p->frame);
377 p->result = codec->decode(avctx, &p->frame, &p->got_frame, &p->avpkt);
379 if (p->state == STATE_SETTING_UP) ff_thread_finish_setup(avctx);
381 p->state = STATE_INPUT_READY;
383 pthread_mutex_lock(&p->progress_mutex);
384 pthread_cond_signal(&p->output_cond);
385 pthread_mutex_unlock(&p->progress_mutex);
387 pthread_mutex_unlock(&p->mutex);
394 * Update the next thread's AVCodecContext with values from the reference thread's context.
396 * @param dst The destination context.
397 * @param src The source context.
398 * @param for_user 0 if the destination is a codec thread, 1 if the destination is the user's thread
400 static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src, int for_user)
405 dst->sub_id = src->sub_id;
406 dst->time_base = src->time_base;
407 dst->width = src->width;
408 dst->height = src->height;
409 dst->pix_fmt = src->pix_fmt;
411 dst->coded_width = src->coded_width;
412 dst->coded_height = src->coded_height;
414 dst->has_b_frames = src->has_b_frames;
415 dst->idct_algo = src->idct_algo;
417 dst->bits_per_coded_sample = src->bits_per_coded_sample;
418 dst->sample_aspect_ratio = src->sample_aspect_ratio;
419 dst->dtg_active_format = src->dtg_active_format;
421 dst->profile = src->profile;
422 dst->level = src->level;
424 dst->bits_per_raw_sample = src->bits_per_raw_sample;
425 dst->ticks_per_frame = src->ticks_per_frame;
426 dst->color_primaries = src->color_primaries;
428 dst->color_trc = src->color_trc;
429 dst->colorspace = src->colorspace;
430 dst->color_range = src->color_range;
431 dst->chroma_sample_location = src->chroma_sample_location;
435 dst->coded_frame = src->coded_frame;
437 if (dst->codec->update_thread_context)
438 err = dst->codec->update_thread_context(dst, src);
445 * Update the next thread's AVCodecContext with values set by the user.
447 * @param dst The destination context.
448 * @param src The source context.
449 * @return 0 on success, negative error code on failure
451 static int update_context_from_user(AVCodecContext *dst, AVCodecContext *src)
453 #define copy_fields(s, e) memcpy(&dst->s, &src->s, (char*)&dst->e - (char*)&dst->s);
454 dst->flags = src->flags;
456 dst->draw_horiz_band= src->draw_horiz_band;
457 dst->get_buffer = src->get_buffer;
458 dst->release_buffer = src->release_buffer;
460 dst->opaque = src->opaque;
461 dst->dsp_mask = src->dsp_mask;
462 dst->debug = src->debug;
463 dst->debug_mv = src->debug_mv;
465 dst->slice_flags = src->slice_flags;
466 dst->flags2 = src->flags2;
468 copy_fields(skip_loop_filter, bidir_refine);
470 dst->frame_number = src->frame_number;
471 dst->reordered_opaque = src->reordered_opaque;
473 if (src->slice_count && src->slice_offset) {
474 if (dst->slice_count < src->slice_count) {
475 int *tmp = av_realloc(dst->slice_offset, src->slice_count *
476 sizeof(*dst->slice_offset));
478 av_free(dst->slice_offset);
479 return AVERROR(ENOMEM);
481 dst->slice_offset = tmp;
483 memcpy(dst->slice_offset, src->slice_offset,
484 src->slice_count * sizeof(*dst->slice_offset));
486 dst->slice_count = src->slice_count;
491 static void free_progress(AVFrame *f)
493 PerThreadContext *p = f->owner->thread_opaque;
494 int *progress = f->thread_opaque;
496 p->progress_used[(progress - p->progress[0]) / 2] = 0;
499 /// Releases the buffers that this decoding thread was the last user of.
500 static void release_delayed_buffers(PerThreadContext *p)
502 FrameThreadContext *fctx = p->parent;
504 while (p->num_released_buffers > 0) {
507 pthread_mutex_lock(&fctx->buffer_mutex);
508 f = &p->released_buffers[--p->num_released_buffers];
510 f->thread_opaque = NULL;
512 f->owner->release_buffer(f->owner, f);
513 pthread_mutex_unlock(&fctx->buffer_mutex);
517 static int submit_packet(PerThreadContext *p, AVPacket *avpkt)
519 FrameThreadContext *fctx = p->parent;
520 PerThreadContext *prev_thread = fctx->prev_thread;
521 AVCodec *codec = p->avctx->codec;
522 uint8_t *buf = p->avpkt.data;
524 if (!avpkt->size && !(codec->capabilities & CODEC_CAP_DELAY)) return 0;
526 pthread_mutex_lock(&p->mutex);
528 release_delayed_buffers(p);
532 if (prev_thread->state == STATE_SETTING_UP) {
533 pthread_mutex_lock(&prev_thread->progress_mutex);
534 while (prev_thread->state == STATE_SETTING_UP)
535 pthread_cond_wait(&prev_thread->progress_cond, &prev_thread->progress_mutex);
536 pthread_mutex_unlock(&prev_thread->progress_mutex);
539 err = update_context_from_thread(p->avctx, prev_thread->avctx, 0);
541 pthread_mutex_unlock(&p->mutex);
546 av_fast_malloc(&buf, &p->allocated_buf_size, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
549 memcpy(buf, avpkt->data, avpkt->size);
550 memset(buf + avpkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
552 p->state = STATE_SETTING_UP;
553 pthread_cond_signal(&p->input_cond);
554 pthread_mutex_unlock(&p->mutex);
557 * If the client doesn't have a thread-safe get_buffer(),
558 * then decoding threads call back to the main thread,
559 * and it calls back to the client here.
562 if (!p->avctx->thread_safe_callbacks &&
563 p->avctx->get_buffer != avcodec_default_get_buffer) {
564 while (p->state != STATE_SETUP_FINISHED && p->state != STATE_INPUT_READY) {
565 pthread_mutex_lock(&p->progress_mutex);
566 while (p->state == STATE_SETTING_UP)
567 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
569 if (p->state == STATE_GET_BUFFER) {
570 p->result = p->avctx->get_buffer(p->avctx, p->requested_frame);
571 p->state = STATE_SETTING_UP;
572 pthread_cond_signal(&p->progress_cond);
574 pthread_mutex_unlock(&p->progress_mutex);
578 fctx->prev_thread = p;
579 fctx->next_decoding++;
584 int ff_thread_decode_frame(AVCodecContext *avctx,
585 AVFrame *picture, int *got_picture_ptr,
588 FrameThreadContext *fctx = avctx->thread_opaque;
589 int finished = fctx->next_finished;
594 * Submit a packet to the next decoding thread.
597 p = &fctx->threads[fctx->next_decoding];
598 err = update_context_from_user(p->avctx, avctx);
600 err = submit_packet(p, avpkt);
604 * If we're still receiving the initial packets, don't return a frame.
607 if (fctx->delaying && avpkt->size) {
608 if (fctx->next_decoding >= (avctx->thread_count-1)) fctx->delaying = 0;
615 * Return the next available frame from the oldest thread.
616 * If we're at the end of the stream, then we have to skip threads that
617 * didn't output a frame, because we don't want to accidentally signal
618 * EOF (avpkt->size == 0 && *got_picture_ptr == 0).
622 p = &fctx->threads[finished++];
624 if (p->state != STATE_INPUT_READY) {
625 pthread_mutex_lock(&p->progress_mutex);
626 while (p->state != STATE_INPUT_READY)
627 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
628 pthread_mutex_unlock(&p->progress_mutex);
632 *got_picture_ptr = p->got_frame;
633 picture->pkt_dts = p->avpkt.dts;
634 picture->sample_aspect_ratio = avctx->sample_aspect_ratio;
635 picture->width = avctx->width;
636 picture->height = avctx->height;
637 picture->format = avctx->pix_fmt;
640 * A later call with avkpt->size == 0 may loop over all threads,
641 * including this one, searching for a frame to return before being
642 * stopped by the "finished != fctx->next_finished" condition.
643 * Make sure we don't mistakenly return the same frame again.
647 if (finished >= avctx->thread_count) finished = 0;
648 } while (!avpkt->size && !*got_picture_ptr && finished != fctx->next_finished);
650 update_context_from_thread(avctx, p->avctx, 1);
652 if (fctx->next_decoding >= avctx->thread_count) fctx->next_decoding = 0;
654 fctx->next_finished = finished;
656 /* return the size of the consumed packet if no error occurred */
657 return (p->result >= 0) ? avpkt->size : p->result;
660 void ff_thread_report_progress(AVFrame *f, int n, int field)
663 int *progress = f->thread_opaque;
665 if (!progress || progress[field] >= n) return;
667 p = f->owner->thread_opaque;
669 if (f->owner->debug&FF_DEBUG_THREADS)
670 av_log(f->owner, AV_LOG_DEBUG, "%p finished %d field %d\n", progress, n, field);
672 pthread_mutex_lock(&p->progress_mutex);
674 pthread_cond_broadcast(&p->progress_cond);
675 pthread_mutex_unlock(&p->progress_mutex);
678 void ff_thread_await_progress(AVFrame *f, int n, int field)
681 int *progress = f->thread_opaque;
683 if (!progress || progress[field] >= n) return;
685 p = f->owner->thread_opaque;
687 if (f->owner->debug&FF_DEBUG_THREADS)
688 av_log(f->owner, AV_LOG_DEBUG, "thread awaiting %d field %d from %p\n", n, field, progress);
690 pthread_mutex_lock(&p->progress_mutex);
691 while (progress[field] < n)
692 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
693 pthread_mutex_unlock(&p->progress_mutex);
696 void ff_thread_finish_setup(AVCodecContext *avctx) {
697 PerThreadContext *p = avctx->thread_opaque;
699 if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
701 pthread_mutex_lock(&p->progress_mutex);
702 p->state = STATE_SETUP_FINISHED;
703 pthread_cond_broadcast(&p->progress_cond);
704 pthread_mutex_unlock(&p->progress_mutex);
707 /// Waits for all threads to finish.
708 static void park_frame_worker_threads(FrameThreadContext *fctx, int thread_count)
712 for (i = 0; i < thread_count; i++) {
713 PerThreadContext *p = &fctx->threads[i];
715 if (p->state != STATE_INPUT_READY) {
716 pthread_mutex_lock(&p->progress_mutex);
717 while (p->state != STATE_INPUT_READY)
718 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
719 pthread_mutex_unlock(&p->progress_mutex);
724 static void frame_thread_free(AVCodecContext *avctx, int thread_count)
726 FrameThreadContext *fctx = avctx->thread_opaque;
727 AVCodec *codec = avctx->codec;
730 park_frame_worker_threads(fctx, thread_count);
732 if (fctx->prev_thread && fctx->prev_thread != fctx->threads)
733 update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0);
737 for (i = 0; i < thread_count; i++) {
738 PerThreadContext *p = &fctx->threads[i];
740 pthread_mutex_lock(&p->mutex);
741 pthread_cond_signal(&p->input_cond);
742 pthread_mutex_unlock(&p->mutex);
745 pthread_join(p->thread, NULL);
748 codec->close(p->avctx);
752 release_delayed_buffers(p);
755 for (i = 0; i < thread_count; i++) {
756 PerThreadContext *p = &fctx->threads[i];
758 avcodec_default_free_buffers(p->avctx);
760 pthread_mutex_destroy(&p->mutex);
761 pthread_mutex_destroy(&p->progress_mutex);
762 pthread_cond_destroy(&p->input_cond);
763 pthread_cond_destroy(&p->progress_cond);
764 pthread_cond_destroy(&p->output_cond);
765 av_freep(&p->avpkt.data);
768 av_freep(&p->avctx->priv_data);
769 av_freep(&p->avctx->internal);
770 av_freep(&p->avctx->slice_offset);
776 av_freep(&fctx->threads);
777 pthread_mutex_destroy(&fctx->buffer_mutex);
778 av_freep(&avctx->thread_opaque);
781 static int frame_thread_init(AVCodecContext *avctx)
783 int thread_count = avctx->thread_count;
784 AVCodec *codec = avctx->codec;
785 AVCodecContext *src = avctx;
786 FrameThreadContext *fctx;
790 int nb_cpus = get_logical_cpus(avctx);
791 // use number of cores + 1 as thread count if there is more than one
793 thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
795 thread_count = avctx->thread_count = 1;
798 if (thread_count <= 1) {
799 avctx->active_thread_type = 0;
803 avctx->thread_opaque = fctx = av_mallocz(sizeof(FrameThreadContext));
805 fctx->threads = av_mallocz(sizeof(PerThreadContext) * thread_count);
806 pthread_mutex_init(&fctx->buffer_mutex, NULL);
809 for (i = 0; i < thread_count; i++) {
810 AVCodecContext *copy = av_malloc(sizeof(AVCodecContext));
811 PerThreadContext *p = &fctx->threads[i];
813 pthread_mutex_init(&p->mutex, NULL);
814 pthread_mutex_init(&p->progress_mutex, NULL);
815 pthread_cond_init(&p->input_cond, NULL);
816 pthread_cond_init(&p->progress_cond, NULL);
817 pthread_cond_init(&p->output_cond, NULL);
823 err = AVERROR(ENOMEM);
828 copy->thread_opaque = p;
829 copy->pkt = &p->avpkt;
835 err = codec->init(copy);
837 update_context_from_thread(avctx, copy, 1);
839 copy->priv_data = av_malloc(codec->priv_data_size);
840 if (!copy->priv_data) {
841 err = AVERROR(ENOMEM);
844 memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
845 copy->internal = av_malloc(sizeof(AVCodecInternal));
846 if (!copy->internal) {
847 err = AVERROR(ENOMEM);
850 *copy->internal = *src->internal;
851 copy->internal->is_copy = 1;
853 if (codec->init_thread_copy)
854 err = codec->init_thread_copy(copy);
859 if (!pthread_create(&p->thread, NULL, frame_worker_thread, p))
866 frame_thread_free(avctx, i+1);
871 void ff_thread_flush(AVCodecContext *avctx)
873 FrameThreadContext *fctx = avctx->thread_opaque;
875 if (!avctx->thread_opaque) return;
877 park_frame_worker_threads(fctx, avctx->thread_count);
878 if (fctx->prev_thread) {
879 if (fctx->prev_thread != &fctx->threads[0])
880 update_context_from_thread(fctx->threads[0].avctx, fctx->prev_thread->avctx, 0);
881 if (avctx->codec->flush)
882 avctx->codec->flush(fctx->threads[0].avctx);
885 fctx->next_decoding = fctx->next_finished = 0;
887 fctx->prev_thread = NULL;
890 static int *allocate_progress(PerThreadContext *p)
894 for (i = 0; i < MAX_BUFFERS; i++)
895 if (!p->progress_used[i]) break;
897 if (i == MAX_BUFFERS) {
898 av_log(p->avctx, AV_LOG_ERROR, "allocate_progress() overflow\n");
902 p->progress_used[i] = 1;
904 return p->progress[i];
907 int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f)
909 PerThreadContext *p = avctx->thread_opaque;
914 if (!(avctx->active_thread_type&FF_THREAD_FRAME)) {
915 f->thread_opaque = NULL;
916 return avctx->get_buffer(avctx, f);
919 if (p->state != STATE_SETTING_UP &&
920 (avctx->codec->update_thread_context || !avctx->thread_safe_callbacks)) {
921 av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
925 pthread_mutex_lock(&p->parent->buffer_mutex);
926 f->thread_opaque = progress = allocate_progress(p);
929 pthread_mutex_unlock(&p->parent->buffer_mutex);
936 if (avctx->thread_safe_callbacks ||
937 avctx->get_buffer == avcodec_default_get_buffer) {
938 err = avctx->get_buffer(avctx, f);
940 p->requested_frame = f;
941 p->state = STATE_GET_BUFFER;
942 pthread_mutex_lock(&p->progress_mutex);
943 pthread_cond_signal(&p->progress_cond);
945 while (p->state != STATE_SETTING_UP)
946 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
950 pthread_mutex_unlock(&p->progress_mutex);
952 if (!avctx->codec->update_thread_context)
953 ff_thread_finish_setup(avctx);
956 pthread_mutex_unlock(&p->parent->buffer_mutex);
961 void ff_thread_release_buffer(AVCodecContext *avctx, AVFrame *f)
963 PerThreadContext *p = avctx->thread_opaque;
964 FrameThreadContext *fctx;
966 if (!(avctx->active_thread_type&FF_THREAD_FRAME)) {
967 avctx->release_buffer(avctx, f);
971 if (p->num_released_buffers >= MAX_BUFFERS) {
972 av_log(p->avctx, AV_LOG_ERROR, "too many thread_release_buffer calls!\n");
976 if(avctx->debug & FF_DEBUG_BUFFERS)
977 av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p\n", f);
980 pthread_mutex_lock(&fctx->buffer_mutex);
981 p->released_buffers[p->num_released_buffers++] = *f;
982 pthread_mutex_unlock(&fctx->buffer_mutex);
983 memset(f->data, 0, sizeof(f->data));
987 * Set the threading algorithms used.
989 * Threading requires more than one thread.
990 * Frame threading requires entire frames to be passed to the codec,
991 * and introduces extra decoding delay, so is incompatible with low_delay.
993 * @param avctx The context.
995 static void validate_thread_parameters(AVCodecContext *avctx)
997 int frame_threading_supported = (avctx->codec->capabilities & CODEC_CAP_FRAME_THREADS)
998 && !(avctx->flags & CODEC_FLAG_TRUNCATED)
999 && !(avctx->flags & CODEC_FLAG_LOW_DELAY)
1000 && !(avctx->flags2 & CODEC_FLAG2_CHUNKS);
1001 if (avctx->thread_count == 1) {
1002 avctx->active_thread_type = 0;
1003 } else if (frame_threading_supported && (avctx->thread_type & FF_THREAD_FRAME)) {
1004 avctx->active_thread_type = FF_THREAD_FRAME;
1005 } else if (avctx->codec->capabilities & CODEC_CAP_SLICE_THREADS &&
1006 avctx->thread_type & FF_THREAD_SLICE) {
1007 avctx->active_thread_type = FF_THREAD_SLICE;
1008 } else if (!(avctx->codec->capabilities & CODEC_CAP_AUTO_THREADS)) {
1009 avctx->thread_count = 1;
1010 avctx->active_thread_type = 0;
1014 int ff_thread_init(AVCodecContext *avctx)
1016 if (avctx->thread_opaque) {
1017 av_log(avctx, AV_LOG_ERROR, "avcodec_thread_init is ignored after avcodec_open\n");
1026 validate_thread_parameters(avctx);
1028 if (avctx->active_thread_type&FF_THREAD_SLICE)
1029 return thread_init(avctx);
1030 else if (avctx->active_thread_type&FF_THREAD_FRAME)
1031 return frame_thread_init(avctx);
1037 void ff_thread_free(AVCodecContext *avctx)
1039 if (avctx->active_thread_type&FF_THREAD_FRAME)
1040 frame_thread_free(avctx, avctx->thread_count);