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
37 #elif HAVE_GETSYSTEMINFO
40 #include <sys/types.h>
41 #include <sys/sysctl.h>
51 #include "w32pthreads.h"
54 typedef int (action_func)(AVCodecContext *c, void *arg);
55 typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr);
57 typedef struct ThreadContext {
67 pthread_cond_t last_job_cond;
68 pthread_cond_t current_job_cond;
69 pthread_mutex_t current_job_lock;
74 /// Max number of frame buffers that can be allocated when using frame threads.
75 #define MAX_BUFFERS (32+1)
78 * Context used by codec threads and stored in their AVCodecContext thread_opaque.
80 typedef struct PerThreadContext {
81 struct FrameThreadContext *parent;
85 pthread_cond_t input_cond; ///< Used to wait for a new packet from the main thread.
86 pthread_cond_t progress_cond; ///< Used by child threads to wait for progress to change.
87 pthread_cond_t output_cond; ///< Used by the main thread to wait for frames to finish.
89 pthread_mutex_t mutex; ///< Mutex used to protect the contents of the PerThreadContext.
90 pthread_mutex_t progress_mutex; ///< Mutex used to protect frame progress values and progress_cond.
92 AVCodecContext *avctx; ///< Context used to decode packets passed to this thread.
94 AVPacket avpkt; ///< Input packet (for decoding) or output (for encoding).
95 int allocated_buf_size; ///< Size allocated for avpkt.data
97 AVFrame frame; ///< Output frame (for decoding) or input (for encoding).
98 int got_frame; ///< The output of got_picture_ptr from the last avcodec_decode_video() call.
99 int result; ///< The result of the last codec decode/encode() call.
102 STATE_INPUT_READY, ///< Set when the thread is awaiting a packet.
103 STATE_SETTING_UP, ///< Set before the codec has called ff_thread_finish_setup().
104 STATE_GET_BUFFER, /**<
105 * Set when the codec calls get_buffer().
106 * State is returned to STATE_SETTING_UP afterwards.
108 STATE_SETUP_FINISHED ///< Set after the codec has called ff_thread_finish_setup().
112 * Array of frames passed to ff_thread_release_buffer().
113 * Frames are released after all threads referencing them are finished.
115 AVFrame released_buffers[MAX_BUFFERS];
116 int num_released_buffers;
119 * Array of progress values used by ff_thread_get_buffer().
121 int progress[MAX_BUFFERS][2];
122 uint8_t progress_used[MAX_BUFFERS];
124 AVFrame *requested_frame; ///< AVFrame the codec passed to get_buffer()
128 * Context stored in the client AVCodecContext thread_opaque.
130 typedef struct FrameThreadContext {
131 PerThreadContext *threads; ///< The contexts for each thread.
132 PerThreadContext *prev_thread; ///< The last thread submit_packet() was called on.
134 pthread_mutex_t buffer_mutex; ///< Mutex used to protect get/release_buffer().
136 int next_decoding; ///< The next context to submit a packet to.
137 int next_finished; ///< The next context to return output from.
140 * Set for the first N packets, where N is the number of threads.
141 * While it is set, ff_thread_en/decode_frame won't return any results.
144 int die; ///< Set when threads should exit.
145 } FrameThreadContext;
148 /* H264 slice threading seems to be buggy with more than 16 threads,
149 * limit the number of threads to 16 for automatic detection */
150 #define MAX_AUTO_THREADS 16
152 static int get_logical_cpus(AVCodecContext *avctx)
154 int ret, nb_cpus = 1;
155 #if HAVE_SCHED_GETAFFINITY && defined(CPU_COUNT)
160 ret = sched_getaffinity(0, sizeof(cpuset), &cpuset);
162 nb_cpus = CPU_COUNT(&cpuset);
164 #elif HAVE_GETSYSTEMINFO
166 GetSystemInfo(&sysinfo);
167 nb_cpus = sysinfo.dwNumberOfProcessors;
168 #elif HAVE_SYSCTL && defined(HW_NCPU)
169 int mib[2] = { CTL_HW, HW_NCPU };
170 size_t len = sizeof(nb_cpus);
172 ret = sysctl(mib, 2, &nb_cpus, &len, NULL, 0);
176 av_log(avctx, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
177 return FFMIN(nb_cpus, MAX_AUTO_THREADS);
181 static void* attribute_align_arg worker(void *v)
183 AVCodecContext *avctx = v;
184 ThreadContext *c = avctx->thread_opaque;
185 int our_job = c->job_count;
186 int thread_count = avctx->thread_count;
189 pthread_mutex_lock(&c->current_job_lock);
190 self_id = c->current_job++;
192 while (our_job >= c->job_count) {
193 if (c->current_job == thread_count + c->job_count)
194 pthread_cond_signal(&c->last_job_cond);
196 pthread_cond_wait(&c->current_job_cond, &c->current_job_lock);
200 pthread_mutex_unlock(&c->current_job_lock);
204 pthread_mutex_unlock(&c->current_job_lock);
206 c->rets[our_job%c->rets_count] = c->func ? c->func(avctx, (char*)c->args + our_job*c->job_size):
207 c->func2(avctx, c->args, our_job, self_id);
209 pthread_mutex_lock(&c->current_job_lock);
210 our_job = c->current_job++;
214 static av_always_inline void avcodec_thread_park_workers(ThreadContext *c, int thread_count)
216 pthread_cond_wait(&c->last_job_cond, &c->current_job_lock);
217 pthread_mutex_unlock(&c->current_job_lock);
220 static void thread_free(AVCodecContext *avctx)
222 ThreadContext *c = avctx->thread_opaque;
225 pthread_mutex_lock(&c->current_job_lock);
227 pthread_cond_broadcast(&c->current_job_cond);
228 pthread_mutex_unlock(&c->current_job_lock);
230 for (i=0; i<avctx->thread_count; i++)
231 pthread_join(c->workers[i], NULL);
233 pthread_mutex_destroy(&c->current_job_lock);
234 pthread_cond_destroy(&c->current_job_cond);
235 pthread_cond_destroy(&c->last_job_cond);
237 av_freep(&avctx->thread_opaque);
240 static int avcodec_thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size)
242 ThreadContext *c= avctx->thread_opaque;
245 if (!(avctx->active_thread_type&FF_THREAD_SLICE) || avctx->thread_count <= 1)
246 return avcodec_default_execute(avctx, func, arg, ret, job_count, job_size);
251 pthread_mutex_lock(&c->current_job_lock);
253 c->current_job = avctx->thread_count;
254 c->job_count = job_count;
255 c->job_size = job_size;
260 c->rets_count = job_count;
262 c->rets = &dummy_ret;
265 pthread_cond_broadcast(&c->current_job_cond);
267 avcodec_thread_park_workers(c, avctx->thread_count);
272 static int avcodec_thread_execute2(AVCodecContext *avctx, action_func2* func2, void *arg, int *ret, int job_count)
274 ThreadContext *c= avctx->thread_opaque;
276 return avcodec_thread_execute(avctx, NULL, arg, ret, job_count, 0);
279 static int thread_init(AVCodecContext *avctx)
283 int thread_count = avctx->thread_count;
286 int nb_cpus = get_logical_cpus(avctx);
287 // use number of cores + 1 as thread count if there is motre than one
289 thread_count = avctx->thread_count = nb_cpus + 1;
292 if (thread_count <= 1) {
293 avctx->active_thread_type = 0;
297 c = av_mallocz(sizeof(ThreadContext));
301 c->workers = av_mallocz(sizeof(pthread_t)*thread_count);
307 avctx->thread_opaque = c;
312 pthread_cond_init(&c->current_job_cond, NULL);
313 pthread_cond_init(&c->last_job_cond, NULL);
314 pthread_mutex_init(&c->current_job_lock, NULL);
315 pthread_mutex_lock(&c->current_job_lock);
316 for (i=0; i<thread_count; i++) {
317 if(pthread_create(&c->workers[i], NULL, worker, avctx)) {
318 avctx->thread_count = i;
319 pthread_mutex_unlock(&c->current_job_lock);
320 ff_thread_free(avctx);
325 avcodec_thread_park_workers(c, thread_count);
327 avctx->execute = avcodec_thread_execute;
328 avctx->execute2 = avcodec_thread_execute2;
333 * Codec worker thread.
335 * Automatically calls ff_thread_finish_setup() if the codec does
336 * not provide an update_thread_context method, or if the codec returns
339 static attribute_align_arg void *frame_worker_thread(void *arg)
341 PerThreadContext *p = arg;
342 FrameThreadContext *fctx = p->parent;
343 AVCodecContext *avctx = p->avctx;
344 AVCodec *codec = avctx->codec;
347 if (p->state == STATE_INPUT_READY && !fctx->die) {
348 pthread_mutex_lock(&p->mutex);
349 while (p->state == STATE_INPUT_READY && !fctx->die)
350 pthread_cond_wait(&p->input_cond, &p->mutex);
351 pthread_mutex_unlock(&p->mutex);
354 if (fctx->die) break;
356 if (!codec->update_thread_context && avctx->thread_safe_callbacks)
357 ff_thread_finish_setup(avctx);
359 pthread_mutex_lock(&p->mutex);
360 avcodec_get_frame_defaults(&p->frame);
362 p->result = codec->decode(avctx, &p->frame, &p->got_frame, &p->avpkt);
364 if (p->state == STATE_SETTING_UP) ff_thread_finish_setup(avctx);
366 p->state = STATE_INPUT_READY;
368 pthread_mutex_lock(&p->progress_mutex);
369 pthread_cond_signal(&p->output_cond);
370 pthread_mutex_unlock(&p->progress_mutex);
372 pthread_mutex_unlock(&p->mutex);
379 * Update the next thread's AVCodecContext with values from the reference thread's context.
381 * @param dst The destination context.
382 * @param src The source context.
383 * @param for_user 0 if the destination is a codec thread, 1 if the destination is the user's thread
385 static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src, int for_user)
390 dst->sub_id = src->sub_id;
391 dst->time_base = src->time_base;
392 dst->width = src->width;
393 dst->height = src->height;
394 dst->pix_fmt = src->pix_fmt;
396 dst->coded_width = src->coded_width;
397 dst->coded_height = src->coded_height;
399 dst->has_b_frames = src->has_b_frames;
400 dst->idct_algo = src->idct_algo;
401 dst->slice_count = src->slice_count;
403 dst->bits_per_coded_sample = src->bits_per_coded_sample;
404 dst->sample_aspect_ratio = src->sample_aspect_ratio;
405 dst->dtg_active_format = src->dtg_active_format;
407 dst->profile = src->profile;
408 dst->level = src->level;
410 dst->bits_per_raw_sample = src->bits_per_raw_sample;
411 dst->ticks_per_frame = src->ticks_per_frame;
412 dst->color_primaries = src->color_primaries;
414 dst->color_trc = src->color_trc;
415 dst->colorspace = src->colorspace;
416 dst->color_range = src->color_range;
417 dst->chroma_sample_location = src->chroma_sample_location;
421 dst->coded_frame = src->coded_frame;
423 if (dst->codec->update_thread_context)
424 err = dst->codec->update_thread_context(dst, src);
431 * Update the next thread's AVCodecContext with values set by the user.
433 * @param dst The destination context.
434 * @param src The source context.
436 static void update_context_from_user(AVCodecContext *dst, AVCodecContext *src)
438 #define copy_fields(s, e) memcpy(&dst->s, &src->s, (char*)&dst->e - (char*)&dst->s);
439 dst->flags = src->flags;
441 dst->draw_horiz_band= src->draw_horiz_band;
442 dst->get_buffer = src->get_buffer;
443 dst->release_buffer = src->release_buffer;
445 dst->opaque = src->opaque;
446 dst->dsp_mask = src->dsp_mask;
447 dst->debug = src->debug;
448 dst->debug_mv = src->debug_mv;
450 dst->slice_flags = src->slice_flags;
451 dst->flags2 = src->flags2;
453 copy_fields(skip_loop_filter, bidir_refine);
455 dst->frame_number = src->frame_number;
456 dst->reordered_opaque = src->reordered_opaque;
460 static void free_progress(AVFrame *f)
462 PerThreadContext *p = f->owner->thread_opaque;
463 int *progress = f->thread_opaque;
465 p->progress_used[(progress - p->progress[0]) / 2] = 0;
468 /// Releases the buffers that this decoding thread was the last user of.
469 static void release_delayed_buffers(PerThreadContext *p)
471 FrameThreadContext *fctx = p->parent;
473 while (p->num_released_buffers > 0) {
476 pthread_mutex_lock(&fctx->buffer_mutex);
477 f = &p->released_buffers[--p->num_released_buffers];
479 f->thread_opaque = NULL;
481 f->owner->release_buffer(f->owner, f);
482 pthread_mutex_unlock(&fctx->buffer_mutex);
486 static int submit_packet(PerThreadContext *p, AVPacket *avpkt)
488 FrameThreadContext *fctx = p->parent;
489 PerThreadContext *prev_thread = fctx->prev_thread;
490 AVCodec *codec = p->avctx->codec;
491 uint8_t *buf = p->avpkt.data;
493 if (!avpkt->size && !(codec->capabilities & CODEC_CAP_DELAY)) return 0;
495 pthread_mutex_lock(&p->mutex);
497 release_delayed_buffers(p);
501 if (prev_thread->state == STATE_SETTING_UP) {
502 pthread_mutex_lock(&prev_thread->progress_mutex);
503 while (prev_thread->state == STATE_SETTING_UP)
504 pthread_cond_wait(&prev_thread->progress_cond, &prev_thread->progress_mutex);
505 pthread_mutex_unlock(&prev_thread->progress_mutex);
508 err = update_context_from_thread(p->avctx, prev_thread->avctx, 0);
510 pthread_mutex_unlock(&p->mutex);
515 av_fast_malloc(&buf, &p->allocated_buf_size, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
518 memcpy(buf, avpkt->data, avpkt->size);
519 memset(buf + avpkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
521 p->state = STATE_SETTING_UP;
522 pthread_cond_signal(&p->input_cond);
523 pthread_mutex_unlock(&p->mutex);
526 * If the client doesn't have a thread-safe get_buffer(),
527 * then decoding threads call back to the main thread,
528 * and it calls back to the client here.
531 if (!p->avctx->thread_safe_callbacks &&
532 p->avctx->get_buffer != avcodec_default_get_buffer) {
533 while (p->state != STATE_SETUP_FINISHED && p->state != STATE_INPUT_READY) {
534 pthread_mutex_lock(&p->progress_mutex);
535 while (p->state == STATE_SETTING_UP)
536 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
538 if (p->state == STATE_GET_BUFFER) {
539 p->result = p->avctx->get_buffer(p->avctx, p->requested_frame);
540 p->state = STATE_SETTING_UP;
541 pthread_cond_signal(&p->progress_cond);
543 pthread_mutex_unlock(&p->progress_mutex);
547 fctx->prev_thread = p;
548 fctx->next_decoding++;
553 int ff_thread_decode_frame(AVCodecContext *avctx,
554 AVFrame *picture, int *got_picture_ptr,
557 FrameThreadContext *fctx = avctx->thread_opaque;
558 int finished = fctx->next_finished;
563 * Submit a packet to the next decoding thread.
566 p = &fctx->threads[fctx->next_decoding];
567 update_context_from_user(p->avctx, avctx);
568 err = submit_packet(p, avpkt);
572 * If we're still receiving the initial packets, don't return a frame.
575 if (fctx->delaying && avpkt->size) {
576 if (fctx->next_decoding >= (avctx->thread_count-1)) fctx->delaying = 0;
583 * Return the next available frame from the oldest thread.
584 * If we're at the end of the stream, then we have to skip threads that
585 * didn't output a frame, because we don't want to accidentally signal
586 * EOF (avpkt->size == 0 && *got_picture_ptr == 0).
590 p = &fctx->threads[finished++];
592 if (p->state != STATE_INPUT_READY) {
593 pthread_mutex_lock(&p->progress_mutex);
594 while (p->state != STATE_INPUT_READY)
595 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
596 pthread_mutex_unlock(&p->progress_mutex);
600 *got_picture_ptr = p->got_frame;
601 picture->pkt_dts = p->avpkt.dts;
602 picture->sample_aspect_ratio = avctx->sample_aspect_ratio;
605 * A later call with avkpt->size == 0 may loop over all threads,
606 * including this one, searching for a frame to return before being
607 * stopped by the "finished != fctx->next_finished" condition.
608 * Make sure we don't mistakenly return the same frame again.
612 if (finished >= avctx->thread_count) finished = 0;
613 } while (!avpkt->size && !*got_picture_ptr && finished != fctx->next_finished);
615 update_context_from_thread(avctx, p->avctx, 1);
617 if (fctx->next_decoding >= avctx->thread_count) fctx->next_decoding = 0;
619 fctx->next_finished = finished;
621 /* return the size of the consumed packet if no error occurred */
622 return (p->result >= 0) ? avpkt->size : p->result;
625 void ff_thread_report_progress(AVFrame *f, int n, int field)
628 int *progress = f->thread_opaque;
630 if (!progress || progress[field] >= n) return;
632 p = f->owner->thread_opaque;
634 if (f->owner->debug&FF_DEBUG_THREADS)
635 av_log(f->owner, AV_LOG_DEBUG, "%p finished %d field %d\n", progress, n, field);
637 pthread_mutex_lock(&p->progress_mutex);
639 pthread_cond_broadcast(&p->progress_cond);
640 pthread_mutex_unlock(&p->progress_mutex);
643 void ff_thread_await_progress(AVFrame *f, int n, int field)
646 int *progress = f->thread_opaque;
648 if (!progress || progress[field] >= n) return;
650 p = f->owner->thread_opaque;
652 if (f->owner->debug&FF_DEBUG_THREADS)
653 av_log(f->owner, AV_LOG_DEBUG, "thread awaiting %d field %d from %p\n", n, field, progress);
655 pthread_mutex_lock(&p->progress_mutex);
656 while (progress[field] < n)
657 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
658 pthread_mutex_unlock(&p->progress_mutex);
661 void ff_thread_finish_setup(AVCodecContext *avctx) {
662 PerThreadContext *p = avctx->thread_opaque;
664 if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
666 pthread_mutex_lock(&p->progress_mutex);
667 p->state = STATE_SETUP_FINISHED;
668 pthread_cond_broadcast(&p->progress_cond);
669 pthread_mutex_unlock(&p->progress_mutex);
672 /// Waits for all threads to finish.
673 static void park_frame_worker_threads(FrameThreadContext *fctx, int thread_count)
677 for (i = 0; i < thread_count; i++) {
678 PerThreadContext *p = &fctx->threads[i];
680 if (p->state != STATE_INPUT_READY) {
681 pthread_mutex_lock(&p->progress_mutex);
682 while (p->state != STATE_INPUT_READY)
683 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
684 pthread_mutex_unlock(&p->progress_mutex);
689 static void frame_thread_free(AVCodecContext *avctx, int thread_count)
691 FrameThreadContext *fctx = avctx->thread_opaque;
692 AVCodec *codec = avctx->codec;
695 park_frame_worker_threads(fctx, thread_count);
697 if (fctx->prev_thread && fctx->prev_thread != fctx->threads)
698 update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0);
702 for (i = 0; i < thread_count; i++) {
703 PerThreadContext *p = &fctx->threads[i];
705 pthread_mutex_lock(&p->mutex);
706 pthread_cond_signal(&p->input_cond);
707 pthread_mutex_unlock(&p->mutex);
710 pthread_join(p->thread, NULL);
713 codec->close(p->avctx);
717 release_delayed_buffers(p);
720 for (i = 0; i < thread_count; i++) {
721 PerThreadContext *p = &fctx->threads[i];
723 avcodec_default_free_buffers(p->avctx);
725 pthread_mutex_destroy(&p->mutex);
726 pthread_mutex_destroy(&p->progress_mutex);
727 pthread_cond_destroy(&p->input_cond);
728 pthread_cond_destroy(&p->progress_cond);
729 pthread_cond_destroy(&p->output_cond);
730 av_freep(&p->avpkt.data);
733 av_freep(&p->avctx->priv_data);
734 av_freep(&p->avctx->internal);
740 av_freep(&fctx->threads);
741 pthread_mutex_destroy(&fctx->buffer_mutex);
742 av_freep(&avctx->thread_opaque);
745 static int frame_thread_init(AVCodecContext *avctx)
747 int thread_count = avctx->thread_count;
748 AVCodec *codec = avctx->codec;
749 AVCodecContext *src = avctx;
750 FrameThreadContext *fctx;
754 int nb_cpus = get_logical_cpus(avctx);
755 // use number of cores + 1 as thread count if there is motre than one
757 thread_count = avctx->thread_count = nb_cpus + 1;
760 if (thread_count <= 1) {
761 avctx->active_thread_type = 0;
765 avctx->thread_opaque = fctx = av_mallocz(sizeof(FrameThreadContext));
767 fctx->threads = av_mallocz(sizeof(PerThreadContext) * thread_count);
768 pthread_mutex_init(&fctx->buffer_mutex, NULL);
771 for (i = 0; i < thread_count; i++) {
772 AVCodecContext *copy = av_malloc(sizeof(AVCodecContext));
773 PerThreadContext *p = &fctx->threads[i];
775 pthread_mutex_init(&p->mutex, NULL);
776 pthread_mutex_init(&p->progress_mutex, NULL);
777 pthread_cond_init(&p->input_cond, NULL);
778 pthread_cond_init(&p->progress_cond, NULL);
779 pthread_cond_init(&p->output_cond, NULL);
785 err = AVERROR(ENOMEM);
790 copy->thread_opaque = p;
791 copy->pkt = &p->avpkt;
797 err = codec->init(copy);
799 update_context_from_thread(avctx, copy, 1);
801 copy->priv_data = av_malloc(codec->priv_data_size);
802 if (!copy->priv_data) {
803 err = AVERROR(ENOMEM);
806 memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
807 copy->internal = av_malloc(sizeof(AVCodecInternal));
808 if (!copy->internal) {
809 err = AVERROR(ENOMEM);
812 *(copy->internal) = *(src->internal);
813 copy->internal->is_copy = 1;
815 if (codec->init_thread_copy)
816 err = codec->init_thread_copy(copy);
821 if (!pthread_create(&p->thread, NULL, frame_worker_thread, p))
828 frame_thread_free(avctx, i+1);
833 void ff_thread_flush(AVCodecContext *avctx)
835 FrameThreadContext *fctx = avctx->thread_opaque;
837 if (!avctx->thread_opaque) return;
839 park_frame_worker_threads(fctx, avctx->thread_count);
840 if (fctx->prev_thread) {
841 if (fctx->prev_thread != &fctx->threads[0])
842 update_context_from_thread(fctx->threads[0].avctx, fctx->prev_thread->avctx, 0);
843 if (avctx->codec->flush)
844 avctx->codec->flush(fctx->threads[0].avctx);
847 fctx->next_decoding = fctx->next_finished = 0;
849 fctx->prev_thread = NULL;
852 static int *allocate_progress(PerThreadContext *p)
856 for (i = 0; i < MAX_BUFFERS; i++)
857 if (!p->progress_used[i]) break;
859 if (i == MAX_BUFFERS) {
860 av_log(p->avctx, AV_LOG_ERROR, "allocate_progress() overflow\n");
864 p->progress_used[i] = 1;
866 return p->progress[i];
869 int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f)
871 PerThreadContext *p = avctx->thread_opaque;
876 if (!(avctx->active_thread_type&FF_THREAD_FRAME)) {
877 f->thread_opaque = NULL;
878 return avctx->get_buffer(avctx, f);
881 if (p->state != STATE_SETTING_UP &&
882 (avctx->codec->update_thread_context || !avctx->thread_safe_callbacks)) {
883 av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
887 pthread_mutex_lock(&p->parent->buffer_mutex);
888 f->thread_opaque = progress = allocate_progress(p);
891 pthread_mutex_unlock(&p->parent->buffer_mutex);
898 if (avctx->thread_safe_callbacks ||
899 avctx->get_buffer == avcodec_default_get_buffer) {
900 err = avctx->get_buffer(avctx, f);
902 p->requested_frame = f;
903 p->state = STATE_GET_BUFFER;
904 pthread_mutex_lock(&p->progress_mutex);
905 pthread_cond_signal(&p->progress_cond);
907 while (p->state != STATE_SETTING_UP)
908 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
912 pthread_mutex_unlock(&p->progress_mutex);
914 if (!avctx->codec->update_thread_context)
915 ff_thread_finish_setup(avctx);
918 pthread_mutex_unlock(&p->parent->buffer_mutex);
923 void ff_thread_release_buffer(AVCodecContext *avctx, AVFrame *f)
925 PerThreadContext *p = avctx->thread_opaque;
926 FrameThreadContext *fctx;
928 if (!(avctx->active_thread_type&FF_THREAD_FRAME)) {
929 avctx->release_buffer(avctx, f);
933 if (p->num_released_buffers >= MAX_BUFFERS) {
934 av_log(p->avctx, AV_LOG_ERROR, "too many thread_release_buffer calls!\n");
938 if(avctx->debug & FF_DEBUG_BUFFERS)
939 av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p\n", f);
942 pthread_mutex_lock(&fctx->buffer_mutex);
943 p->released_buffers[p->num_released_buffers++] = *f;
944 pthread_mutex_unlock(&fctx->buffer_mutex);
945 memset(f->data, 0, sizeof(f->data));
949 * Set the threading algorithms used.
951 * Threading requires more than one thread.
952 * Frame threading requires entire frames to be passed to the codec,
953 * and introduces extra decoding delay, so is incompatible with low_delay.
955 * @param avctx The context.
957 static void validate_thread_parameters(AVCodecContext *avctx)
959 int frame_threading_supported = (avctx->codec->capabilities & CODEC_CAP_FRAME_THREADS)
960 && !(avctx->flags & CODEC_FLAG_TRUNCATED)
961 && !(avctx->flags & CODEC_FLAG_LOW_DELAY)
962 && !(avctx->flags2 & CODEC_FLAG2_CHUNKS);
963 if (avctx->thread_count == 1) {
964 avctx->active_thread_type = 0;
965 } else if (frame_threading_supported && (avctx->thread_type & FF_THREAD_FRAME)) {
966 avctx->active_thread_type = FF_THREAD_FRAME;
967 } else if (avctx->codec->capabilities & CODEC_CAP_SLICE_THREADS &&
968 avctx->thread_type & FF_THREAD_SLICE) {
969 avctx->active_thread_type = FF_THREAD_SLICE;
973 int ff_thread_init(AVCodecContext *avctx)
975 if (avctx->thread_opaque) {
976 av_log(avctx, AV_LOG_ERROR, "avcodec_thread_init is ignored after avcodec_open\n");
985 validate_thread_parameters(avctx);
987 if (avctx->active_thread_type&FF_THREAD_SLICE)
988 return thread_init(avctx);
989 else if (avctx->active_thread_type&FF_THREAD_FRAME)
990 return frame_thread_init(avctx);
996 void ff_thread_free(AVCodecContext *avctx)
998 if (avctx->active_thread_type&FF_THREAD_FRAME)
999 frame_thread_free(avctx, avctx->thread_count);