2 * This file is part of FFmpeg.
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 * Frame multithreading support functions
22 * @see doc/multithreading.txt
27 #include <stdatomic.h>
33 #include "pthread_internal.h"
37 #include "libavutil/avassert.h"
38 #include "libavutil/buffer.h"
39 #include "libavutil/common.h"
40 #include "libavutil/cpu.h"
41 #include "libavutil/frame.h"
42 #include "libavutil/internal.h"
43 #include "libavutil/log.h"
44 #include "libavutil/mem.h"
45 #include "libavutil/opt.h"
46 #include "libavutil/thread.h"
49 ///< Set when the thread is awaiting a packet.
51 ///< Set before the codec has called ff_thread_finish_setup().
54 * Set when the codec calls get_buffer().
55 * State is returned to STATE_SETTING_UP afterwards.
59 * Set when the codec calls get_format().
60 * State is returned to STATE_SETTING_UP afterwards.
63 ///< Set after the codec has called ff_thread_finish_setup().
68 * Context used by codec threads and stored in their AVCodecInternal thread_ctx.
70 typedef struct PerThreadContext {
71 struct FrameThreadContext *parent;
75 pthread_cond_t input_cond; ///< Used to wait for a new packet from the main thread.
76 pthread_cond_t progress_cond; ///< Used by child threads to wait for progress to change.
77 pthread_cond_t output_cond; ///< Used by the main thread to wait for frames to finish.
79 pthread_mutex_t mutex; ///< Mutex used to protect the contents of the PerThreadContext.
80 pthread_mutex_t progress_mutex; ///< Mutex used to protect frame progress values and progress_cond.
82 AVCodecContext *avctx; ///< Context used to decode packets passed to this thread.
84 AVPacket avpkt; ///< Input packet (for decoding) or output (for encoding).
86 AVFrame *frame; ///< Output frame (for decoding) or input (for encoding).
87 int got_frame; ///< The output of got_picture_ptr from the last avcodec_decode_video() call.
88 int result; ///< The result of the last codec decode/encode() call.
93 * Array of frames passed to ff_thread_release_buffer().
94 * Frames are released after all threads referencing them are finished.
96 AVFrame *released_buffers;
97 int num_released_buffers;
98 int released_buffers_allocated;
100 AVFrame *requested_frame; ///< AVFrame the codec passed to get_buffer()
101 int requested_flags; ///< flags passed to get_buffer() for requested_frame
103 const enum AVPixelFormat *available_formats; ///< Format array for get_format()
104 enum AVPixelFormat result_format; ///< get_format() result
106 int die; ///< Set when the thread should exit.
108 int hwaccel_serializing;
109 int async_serializing;
113 * Context stored in the client AVCodecInternal thread_ctx.
115 typedef struct FrameThreadContext {
116 PerThreadContext *threads; ///< The contexts for each thread.
117 PerThreadContext *prev_thread; ///< The last thread submit_packet() was called on.
119 pthread_mutex_t buffer_mutex; ///< Mutex used to protect get/release_buffer().
121 * This lock is used for ensuring threads run in serial when hwaccel
124 pthread_mutex_t hwaccel_mutex;
125 pthread_mutex_t async_mutex;
127 int next_decoding; ///< The next context to submit a packet to.
128 int next_finished; ///< The next context to return output from.
131 * Set for the first N packets, where N is the number of threads.
132 * While it is set, ff_thread_en/decode_frame won't return any results.
134 } FrameThreadContext;
136 #define THREAD_SAFE_CALLBACKS(avctx) \
137 ((avctx)->thread_safe_callbacks || (avctx)->get_buffer2 == avcodec_default_get_buffer2)
140 * Codec worker thread.
142 * Automatically calls ff_thread_finish_setup() if the codec does
143 * not provide an update_thread_context method, or if the codec returns
146 static attribute_align_arg void *frame_worker_thread(void *arg)
148 PerThreadContext *p = arg;
149 AVCodecContext *avctx = p->avctx;
150 const AVCodec *codec = avctx->codec;
152 pthread_mutex_lock(&p->mutex);
154 while (atomic_load(&p->state) == STATE_INPUT_READY && !p->die)
155 pthread_cond_wait(&p->input_cond, &p->mutex);
159 if (!codec->update_thread_context && THREAD_SAFE_CALLBACKS(avctx))
160 ff_thread_finish_setup(avctx);
162 /* If a decoder supports hwaccel, then it must call ff_get_format().
163 * Since that call must happen before ff_thread_finish_setup(), the
164 * decoder is required to implement update_thread_context() and call
165 * ff_thread_finish_setup() manually. Therefore the above
166 * ff_thread_finish_setup() call did not happen and hwaccel_serializing
167 * cannot be true here. */
168 av_assert0(!p->hwaccel_serializing);
170 /* if the previous thread uses hwaccel then we take the lock to ensure
171 * the threads don't run concurrently */
172 if (avctx->hwaccel) {
173 pthread_mutex_lock(&p->parent->hwaccel_mutex);
174 p->hwaccel_serializing = 1;
177 av_frame_unref(p->frame);
179 p->result = codec->decode(avctx, p->frame, &p->got_frame, &p->avpkt);
181 if ((p->result < 0 || !p->got_frame) && p->frame->buf[0]) {
182 if (avctx->internal->allocate_progress)
183 av_log(avctx, AV_LOG_ERROR, "A frame threaded decoder did not "
184 "free the frame on failure. This is a bug, please report it.\n");
185 av_frame_unref(p->frame);
188 if (atomic_load(&p->state) == STATE_SETTING_UP)
189 ff_thread_finish_setup(avctx);
191 if (p->hwaccel_serializing) {
192 p->hwaccel_serializing = 0;
193 pthread_mutex_unlock(&p->parent->hwaccel_mutex);
196 if (p->async_serializing) {
197 p->async_serializing = 0;
198 pthread_mutex_unlock(&p->parent->async_mutex);
201 pthread_mutex_lock(&p->progress_mutex);
203 atomic_store(&p->state, STATE_INPUT_READY);
205 pthread_cond_broadcast(&p->progress_cond);
206 pthread_cond_signal(&p->output_cond);
207 pthread_mutex_unlock(&p->progress_mutex);
209 pthread_mutex_unlock(&p->mutex);
215 * Update the next thread's AVCodecContext with values from the reference thread's context.
217 * @param dst The destination context.
218 * @param src The source context.
219 * @param for_user 0 if the destination is a codec thread, 1 if the destination is the user's thread
220 * @return 0 on success, negative error code on failure
222 static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src, int for_user)
227 dst->time_base = src->time_base;
228 dst->framerate = src->framerate;
229 dst->width = src->width;
230 dst->height = src->height;
231 dst->pix_fmt = src->pix_fmt;
233 dst->coded_width = src->coded_width;
234 dst->coded_height = src->coded_height;
236 dst->has_b_frames = src->has_b_frames;
237 dst->idct_algo = src->idct_algo;
239 dst->bits_per_coded_sample = src->bits_per_coded_sample;
240 dst->sample_aspect_ratio = src->sample_aspect_ratio;
242 FF_DISABLE_DEPRECATION_WARNINGS
243 dst->dtg_active_format = src->dtg_active_format;
244 FF_ENABLE_DEPRECATION_WARNINGS
245 #endif /* FF_API_AFD */
247 dst->profile = src->profile;
248 dst->level = src->level;
250 dst->bits_per_raw_sample = src->bits_per_raw_sample;
251 dst->ticks_per_frame = src->ticks_per_frame;
252 dst->color_primaries = src->color_primaries;
254 dst->color_trc = src->color_trc;
255 dst->colorspace = src->colorspace;
256 dst->color_range = src->color_range;
257 dst->chroma_sample_location = src->chroma_sample_location;
259 dst->hwaccel = src->hwaccel;
260 dst->hwaccel_context = src->hwaccel_context;
262 dst->channels = src->channels;
263 dst->sample_rate = src->sample_rate;
264 dst->sample_fmt = src->sample_fmt;
265 dst->channel_layout = src->channel_layout;
266 dst->internal->hwaccel_priv_data = src->internal->hwaccel_priv_data;
268 if (!!dst->hw_frames_ctx != !!src->hw_frames_ctx ||
269 (dst->hw_frames_ctx && dst->hw_frames_ctx->data != src->hw_frames_ctx->data)) {
270 av_buffer_unref(&dst->hw_frames_ctx);
272 if (src->hw_frames_ctx) {
273 dst->hw_frames_ctx = av_buffer_ref(src->hw_frames_ctx);
274 if (!dst->hw_frames_ctx)
275 return AVERROR(ENOMEM);
279 dst->hwaccel_flags = src->hwaccel_flags;
283 dst->delay = src->thread_count - 1;
284 #if FF_API_CODED_FRAME
285 FF_DISABLE_DEPRECATION_WARNINGS
286 dst->coded_frame = src->coded_frame;
287 FF_ENABLE_DEPRECATION_WARNINGS
290 if (dst->codec->update_thread_context)
291 err = dst->codec->update_thread_context(dst, src);
298 * Update the next thread's AVCodecContext with values set by the user.
300 * @param dst The destination context.
301 * @param src The source context.
302 * @return 0 on success, negative error code on failure
304 static int update_context_from_user(AVCodecContext *dst, AVCodecContext *src)
306 #define copy_fields(s, e) memcpy(&dst->s, &src->s, (char*)&dst->e - (char*)&dst->s);
307 dst->flags = src->flags;
309 dst->draw_horiz_band= src->draw_horiz_band;
310 dst->get_buffer2 = src->get_buffer2;
312 dst->opaque = src->opaque;
313 dst->debug = src->debug;
314 dst->debug_mv = src->debug_mv;
316 dst->slice_flags = src->slice_flags;
317 dst->flags2 = src->flags2;
319 copy_fields(skip_loop_filter, subtitle_header);
321 dst->frame_number = src->frame_number;
322 dst->reordered_opaque = src->reordered_opaque;
323 dst->thread_safe_callbacks = src->thread_safe_callbacks;
325 if (src->slice_count && src->slice_offset) {
326 if (dst->slice_count < src->slice_count) {
327 int err = av_reallocp_array(&dst->slice_offset, src->slice_count,
328 sizeof(*dst->slice_offset));
332 memcpy(dst->slice_offset, src->slice_offset,
333 src->slice_count * sizeof(*dst->slice_offset));
335 dst->slice_count = src->slice_count;
340 /// Releases the buffers that this decoding thread was the last user of.
341 static void release_delayed_buffers(PerThreadContext *p)
343 FrameThreadContext *fctx = p->parent;
345 while (p->num_released_buffers > 0) {
348 pthread_mutex_lock(&fctx->buffer_mutex);
350 // fix extended data in case the caller screwed it up
351 av_assert0(p->avctx->codec_type == AVMEDIA_TYPE_VIDEO ||
352 p->avctx->codec_type == AVMEDIA_TYPE_AUDIO);
353 f = &p->released_buffers[--p->num_released_buffers];
354 f->extended_data = f->data;
357 pthread_mutex_unlock(&fctx->buffer_mutex);
361 static int submit_packet(PerThreadContext *p, AVPacket *avpkt)
363 FrameThreadContext *fctx = p->parent;
364 PerThreadContext *prev_thread = fctx->prev_thread;
365 const AVCodec *codec = p->avctx->codec;
368 if (!avpkt->size && !(codec->capabilities & AV_CODEC_CAP_DELAY))
371 pthread_mutex_lock(&p->mutex);
373 release_delayed_buffers(p);
377 if (atomic_load(&prev_thread->state) == STATE_SETTING_UP) {
378 pthread_mutex_lock(&prev_thread->progress_mutex);
379 while (atomic_load(&prev_thread->state) == STATE_SETTING_UP)
380 pthread_cond_wait(&prev_thread->progress_cond, &prev_thread->progress_mutex);
381 pthread_mutex_unlock(&prev_thread->progress_mutex);
384 err = update_context_from_thread(p->avctx, prev_thread->avctx, 0);
386 pthread_mutex_unlock(&p->mutex);
391 av_packet_unref(&p->avpkt);
392 ret = av_packet_ref(&p->avpkt, avpkt);
394 pthread_mutex_unlock(&p->mutex);
395 av_log(p->avctx, AV_LOG_ERROR, "av_packet_ref() failed in submit_packet()\n");
399 atomic_store(&p->state, STATE_SETTING_UP);
400 pthread_cond_signal(&p->input_cond);
401 pthread_mutex_unlock(&p->mutex);
404 * If the client doesn't have a thread-safe get_buffer(),
405 * then decoding threads call back to the main thread,
406 * and it calls back to the client here.
409 if (!p->avctx->thread_safe_callbacks && (
410 p->avctx->get_format != avcodec_default_get_format ||
411 p->avctx->get_buffer2 != avcodec_default_get_buffer2)) {
412 while (atomic_load(&p->state) != STATE_SETUP_FINISHED && atomic_load(&p->state) != STATE_INPUT_READY) {
414 pthread_mutex_lock(&p->progress_mutex);
415 while (atomic_load(&p->state) == STATE_SETTING_UP)
416 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
418 switch (atomic_load_explicit(&p->state, memory_order_acquire)) {
419 case STATE_GET_BUFFER:
420 p->result = ff_get_buffer(p->avctx, p->requested_frame, p->requested_flags);
422 case STATE_GET_FORMAT:
423 p->result_format = ff_get_format(p->avctx, p->available_formats);
430 atomic_store(&p->state, STATE_SETTING_UP);
431 pthread_cond_signal(&p->progress_cond);
433 pthread_mutex_unlock(&p->progress_mutex);
437 fctx->prev_thread = p;
438 fctx->next_decoding++;
443 int ff_thread_decode_frame(AVCodecContext *avctx,
444 AVFrame *picture, int *got_picture_ptr,
447 FrameThreadContext *fctx = avctx->internal->thread_ctx;
448 int finished = fctx->next_finished;
452 /* release the async lock, permitting blocked hwaccel threads to
453 * go forward while we are in this function */
454 pthread_mutex_unlock(&fctx->async_mutex);
457 * Submit a packet to the next decoding thread.
460 p = &fctx->threads[fctx->next_decoding];
461 err = update_context_from_user(p->avctx, avctx);
464 err = submit_packet(p, avpkt);
469 * If we're still receiving the initial packets, don't return a frame.
472 if (fctx->next_decoding > (avctx->thread_count-1-(avctx->codec_id == AV_CODEC_ID_FFV1)))
475 if (fctx->delaying) {
484 * Return the next available frame from the oldest thread.
485 * If we're at the end of the stream, then we have to skip threads that
486 * didn't output a frame, because we don't want to accidentally signal
487 * EOF (avpkt->size == 0 && *got_picture_ptr == 0).
491 p = &fctx->threads[finished++];
493 if (atomic_load(&p->state) != STATE_INPUT_READY) {
494 pthread_mutex_lock(&p->progress_mutex);
495 while (atomic_load_explicit(&p->state, memory_order_relaxed) != STATE_INPUT_READY)
496 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
497 pthread_mutex_unlock(&p->progress_mutex);
500 av_frame_move_ref(picture, p->frame);
501 *got_picture_ptr = p->got_frame;
502 picture->pkt_dts = p->avpkt.dts;
508 * A later call with avkpt->size == 0 may loop over all threads,
509 * including this one, searching for a frame to return before being
510 * stopped by the "finished != fctx->next_finished" condition.
511 * Make sure we don't mistakenly return the same frame again.
515 if (finished >= avctx->thread_count) finished = 0;
516 } while (!avpkt->size && !*got_picture_ptr && finished != fctx->next_finished);
518 update_context_from_thread(avctx, p->avctx, 1);
520 if (fctx->next_decoding >= avctx->thread_count) fctx->next_decoding = 0;
522 fctx->next_finished = finished;
525 * When no frame was found while flushing, but an error occurred in
526 * any thread, return it instead of 0.
527 * Otherwise the error can get lost.
529 if (!avpkt->size && !*got_picture_ptr)
532 /* return the size of the consumed packet if no error occurred */
533 ret = (p->result >= 0) ? avpkt->size : p->result;
535 pthread_mutex_lock(&fctx->async_mutex);
541 void ff_thread_report_progress(ThreadFrame *f, int n, int field)
544 atomic_int *progress = f->progress ? (atomic_int*)f->progress->data : NULL;
547 atomic_load_explicit(&progress[field], memory_order_relaxed) >= n)
550 p = f->owner->internal->thread_ctx;
552 if (f->owner->debug&FF_DEBUG_THREADS)
553 av_log(f->owner, AV_LOG_DEBUG, "%p finished %d field %d\n", progress, n, field);
555 pthread_mutex_lock(&p->progress_mutex);
557 atomic_store_explicit(&progress[field], n, memory_order_release);
559 pthread_cond_broadcast(&p->progress_cond);
560 pthread_mutex_unlock(&p->progress_mutex);
563 void ff_thread_await_progress(ThreadFrame *f, int n, int field)
566 atomic_int *progress = f->progress ? (atomic_int*)f->progress->data : NULL;
569 atomic_load_explicit(&progress[field], memory_order_acquire) >= n)
572 p = f->owner->internal->thread_ctx;
574 if (f->owner->debug&FF_DEBUG_THREADS)
575 av_log(f->owner, AV_LOG_DEBUG, "thread awaiting %d field %d from %p\n", n, field, progress);
577 pthread_mutex_lock(&p->progress_mutex);
578 while (atomic_load_explicit(&progress[field], memory_order_relaxed) < n)
579 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
580 pthread_mutex_unlock(&p->progress_mutex);
583 void ff_thread_finish_setup(AVCodecContext *avctx) {
584 PerThreadContext *p = avctx->internal->thread_ctx;
586 if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
588 if (avctx->hwaccel && !p->hwaccel_serializing) {
589 pthread_mutex_lock(&p->parent->hwaccel_mutex);
590 p->hwaccel_serializing = 1;
593 /* this assumes that no hwaccel calls happen before ff_thread_finish_setup() */
594 if (avctx->hwaccel &&
595 !(avctx->hwaccel->caps_internal & HWACCEL_CAP_ASYNC_SAFE)) {
596 p->async_serializing = 1;
597 pthread_mutex_lock(&p->parent->async_mutex);
600 pthread_mutex_lock(&p->progress_mutex);
601 if(atomic_load(&p->state) == STATE_SETUP_FINISHED){
602 av_log(avctx, AV_LOG_WARNING, "Multiple ff_thread_finish_setup() calls\n");
605 atomic_store(&p->state, STATE_SETUP_FINISHED);
607 pthread_cond_broadcast(&p->progress_cond);
608 pthread_mutex_unlock(&p->progress_mutex);
611 /// Waits for all threads to finish.
612 static void park_frame_worker_threads(FrameThreadContext *fctx, int thread_count)
616 pthread_mutex_unlock(&fctx->async_mutex);
618 for (i = 0; i < thread_count; i++) {
619 PerThreadContext *p = &fctx->threads[i];
621 if (atomic_load(&p->state) != STATE_INPUT_READY) {
622 pthread_mutex_lock(&p->progress_mutex);
623 while (atomic_load(&p->state) != STATE_INPUT_READY)
624 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
625 pthread_mutex_unlock(&p->progress_mutex);
630 pthread_mutex_lock(&fctx->async_mutex);
633 void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
635 FrameThreadContext *fctx = avctx->internal->thread_ctx;
636 const AVCodec *codec = avctx->codec;
639 park_frame_worker_threads(fctx, thread_count);
641 if (fctx->prev_thread && fctx->prev_thread != fctx->threads)
642 if (update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0) < 0) {
643 av_log(avctx, AV_LOG_ERROR, "Final thread update failed\n");
644 fctx->prev_thread->avctx->internal->is_copy = fctx->threads->avctx->internal->is_copy;
645 fctx->threads->avctx->internal->is_copy = 1;
648 for (i = 0; i < thread_count; i++) {
649 PerThreadContext *p = &fctx->threads[i];
651 pthread_mutex_lock(&p->mutex);
653 pthread_cond_signal(&p->input_cond);
654 pthread_mutex_unlock(&p->mutex);
657 pthread_join(p->thread, NULL);
660 if (codec->close && p->avctx)
661 codec->close(p->avctx);
663 release_delayed_buffers(p);
664 av_frame_free(&p->frame);
667 for (i = 0; i < thread_count; i++) {
668 PerThreadContext *p = &fctx->threads[i];
670 pthread_mutex_destroy(&p->mutex);
671 pthread_mutex_destroy(&p->progress_mutex);
672 pthread_cond_destroy(&p->input_cond);
673 pthread_cond_destroy(&p->progress_cond);
674 pthread_cond_destroy(&p->output_cond);
675 av_packet_unref(&p->avpkt);
676 av_freep(&p->released_buffers);
679 av_freep(&p->avctx->priv_data);
680 av_freep(&p->avctx->slice_offset);
684 av_freep(&p->avctx->internal);
685 av_buffer_unref(&p->avctx->hw_frames_ctx);
691 av_freep(&fctx->threads);
692 pthread_mutex_destroy(&fctx->buffer_mutex);
693 pthread_mutex_destroy(&fctx->hwaccel_mutex);
695 pthread_mutex_unlock(&fctx->async_mutex);
696 pthread_mutex_destroy(&fctx->async_mutex);
698 av_freep(&avctx->internal->thread_ctx);
700 if (avctx->priv_data && avctx->codec && avctx->codec->priv_class)
701 av_opt_free(avctx->priv_data);
705 int ff_frame_thread_init(AVCodecContext *avctx)
707 int thread_count = avctx->thread_count;
708 const AVCodec *codec = avctx->codec;
709 AVCodecContext *src = avctx;
710 FrameThreadContext *fctx;
718 int nb_cpus = av_cpu_count();
719 if ((avctx->debug & (FF_DEBUG_VIS_QP | FF_DEBUG_VIS_MB_TYPE)) || avctx->debug_mv)
721 // use number of cores + 1 as thread count if there is more than one
723 thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
725 thread_count = avctx->thread_count = 1;
728 if (thread_count <= 1) {
729 avctx->active_thread_type = 0;
733 avctx->internal->thread_ctx = fctx = av_mallocz(sizeof(FrameThreadContext));
735 return AVERROR(ENOMEM);
737 fctx->threads = av_mallocz_array(thread_count, sizeof(PerThreadContext));
738 if (!fctx->threads) {
739 av_freep(&avctx->internal->thread_ctx);
740 return AVERROR(ENOMEM);
743 pthread_mutex_init(&fctx->buffer_mutex, NULL);
744 pthread_mutex_init(&fctx->hwaccel_mutex, NULL);
746 pthread_mutex_init(&fctx->async_mutex, NULL);
747 pthread_mutex_lock(&fctx->async_mutex);
751 for (i = 0; i < thread_count; i++) {
752 AVCodecContext *copy = av_malloc(sizeof(AVCodecContext));
753 PerThreadContext *p = &fctx->threads[i];
755 pthread_mutex_init(&p->mutex, NULL);
756 pthread_mutex_init(&p->progress_mutex, NULL);
757 pthread_cond_init(&p->input_cond, NULL);
758 pthread_cond_init(&p->progress_cond, NULL);
759 pthread_cond_init(&p->output_cond, NULL);
761 p->frame = av_frame_alloc();
764 err = AVERROR(ENOMEM);
772 err = AVERROR(ENOMEM);
778 copy->internal = av_malloc(sizeof(AVCodecInternal));
779 if (!copy->internal) {
780 copy->priv_data = NULL;
781 err = AVERROR(ENOMEM);
784 *copy->internal = *src->internal;
785 copy->internal->thread_ctx = p;
786 copy->internal->pkt = &p->avpkt;
792 err = codec->init(copy);
794 update_context_from_thread(avctx, copy, 1);
796 copy->priv_data = av_malloc(codec->priv_data_size);
797 if (!copy->priv_data) {
798 err = AVERROR(ENOMEM);
801 memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
802 copy->internal->is_copy = 1;
804 if (codec->init_thread_copy)
805 err = codec->init_thread_copy(copy);
810 err = AVERROR(pthread_create(&p->thread, NULL, frame_worker_thread, p));
811 p->thread_init= !err;
819 ff_frame_thread_free(avctx, i+1);
824 void ff_thread_flush(AVCodecContext *avctx)
827 FrameThreadContext *fctx = avctx->internal->thread_ctx;
831 park_frame_worker_threads(fctx, avctx->thread_count);
832 if (fctx->prev_thread) {
833 if (fctx->prev_thread != &fctx->threads[0])
834 update_context_from_thread(fctx->threads[0].avctx, fctx->prev_thread->avctx, 0);
837 fctx->next_decoding = fctx->next_finished = 0;
839 fctx->prev_thread = NULL;
840 for (i = 0; i < avctx->thread_count; i++) {
841 PerThreadContext *p = &fctx->threads[i];
842 // Make sure decode flush calls with size=0 won't return old frames
844 av_frame_unref(p->frame);
846 release_delayed_buffers(p);
848 if (avctx->codec->flush)
849 avctx->codec->flush(p->avctx);
853 int ff_thread_can_start_frame(AVCodecContext *avctx)
855 PerThreadContext *p = avctx->internal->thread_ctx;
856 if ((avctx->active_thread_type&FF_THREAD_FRAME) && atomic_load(&p->state) != STATE_SETTING_UP &&
857 (avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {
863 static int thread_get_buffer_internal(AVCodecContext *avctx, ThreadFrame *f, int flags)
865 PerThreadContext *p = avctx->internal->thread_ctx;
870 ff_init_buffer_info(avctx, f->f);
872 if (!(avctx->active_thread_type & FF_THREAD_FRAME))
873 return ff_get_buffer(avctx, f->f, flags);
875 if (atomic_load(&p->state) != STATE_SETTING_UP &&
876 (avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {
877 av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
881 if (avctx->internal->allocate_progress) {
882 atomic_int *progress;
883 f->progress = av_buffer_alloc(2 * sizeof(*progress));
885 return AVERROR(ENOMEM);
887 progress = (atomic_int*)f->progress->data;
889 atomic_init(&progress[0], -1);
890 atomic_init(&progress[1], -1);
893 pthread_mutex_lock(&p->parent->buffer_mutex);
894 if (avctx->thread_safe_callbacks ||
895 avctx->get_buffer2 == avcodec_default_get_buffer2) {
896 err = ff_get_buffer(avctx, f->f, flags);
898 pthread_mutex_lock(&p->progress_mutex);
899 p->requested_frame = f->f;
900 p->requested_flags = flags;
901 atomic_store_explicit(&p->state, STATE_GET_BUFFER, memory_order_release);
902 pthread_cond_broadcast(&p->progress_cond);
904 while (atomic_load(&p->state) != STATE_SETTING_UP)
905 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
909 pthread_mutex_unlock(&p->progress_mutex);
912 if (!THREAD_SAFE_CALLBACKS(avctx) && !avctx->codec->update_thread_context)
913 ff_thread_finish_setup(avctx);
915 av_buffer_unref(&f->progress);
917 pthread_mutex_unlock(&p->parent->buffer_mutex);
922 enum AVPixelFormat ff_thread_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
924 enum AVPixelFormat res;
925 PerThreadContext *p = avctx->internal->thread_ctx;
926 if (!(avctx->active_thread_type & FF_THREAD_FRAME) || avctx->thread_safe_callbacks ||
927 avctx->get_format == avcodec_default_get_format)
928 return ff_get_format(avctx, fmt);
929 if (atomic_load(&p->state) != STATE_SETTING_UP) {
930 av_log(avctx, AV_LOG_ERROR, "get_format() cannot be called after ff_thread_finish_setup()\n");
933 pthread_mutex_lock(&p->progress_mutex);
934 p->available_formats = fmt;
935 atomic_store(&p->state, STATE_GET_FORMAT);
936 pthread_cond_broadcast(&p->progress_cond);
938 while (atomic_load(&p->state) != STATE_SETTING_UP)
939 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
941 res = p->result_format;
943 pthread_mutex_unlock(&p->progress_mutex);
948 int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
950 int ret = thread_get_buffer_internal(avctx, f, flags);
952 av_log(avctx, AV_LOG_ERROR, "thread_get_buffer() failed\n");
956 void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
958 PerThreadContext *p = avctx->internal->thread_ctx;
959 FrameThreadContext *fctx;
961 int can_direct_free = !(avctx->active_thread_type & FF_THREAD_FRAME) ||
962 avctx->thread_safe_callbacks ||
963 avctx->get_buffer2 == avcodec_default_get_buffer2;
965 if (!f->f || !f->f->buf[0])
968 if (avctx->debug & FF_DEBUG_BUFFERS)
969 av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p\n", f);
971 av_buffer_unref(&f->progress);
974 if (can_direct_free) {
975 av_frame_unref(f->f);
980 pthread_mutex_lock(&fctx->buffer_mutex);
982 if (p->num_released_buffers + 1 >= INT_MAX / sizeof(*p->released_buffers))
984 tmp = av_fast_realloc(p->released_buffers, &p->released_buffers_allocated,
985 (p->num_released_buffers + 1) *
986 sizeof(*p->released_buffers));
989 p->released_buffers = tmp;
991 dst = &p->released_buffers[p->num_released_buffers];
992 av_frame_move_ref(dst, f->f);
994 p->num_released_buffers++;
997 pthread_mutex_unlock(&fctx->buffer_mutex);