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;
126 pthread_cond_t async_cond;
129 int next_decoding; ///< The next context to submit a packet to.
130 int next_finished; ///< The next context to return output from.
133 * Set for the first N packets, where N is the number of threads.
134 * While it is set, ff_thread_en/decode_frame won't return any results.
136 } FrameThreadContext;
138 #define THREAD_SAFE_CALLBACKS(avctx) \
139 ((avctx)->thread_safe_callbacks || (avctx)->get_buffer2 == avcodec_default_get_buffer2)
141 static void async_lock(FrameThreadContext *fctx)
143 pthread_mutex_lock(&fctx->async_mutex);
144 while (fctx->async_lock)
145 pthread_cond_wait(&fctx->async_cond, &fctx->async_mutex);
146 fctx->async_lock = 1;
147 pthread_mutex_unlock(&fctx->async_mutex);
150 static void async_unlock(FrameThreadContext *fctx)
152 pthread_mutex_lock(&fctx->async_mutex);
153 av_assert0(fctx->async_lock);
154 fctx->async_lock = 0;
155 pthread_cond_broadcast(&fctx->async_cond);
156 pthread_mutex_unlock(&fctx->async_mutex);
160 * Codec worker thread.
162 * Automatically calls ff_thread_finish_setup() if the codec does
163 * not provide an update_thread_context method, or if the codec returns
166 static attribute_align_arg void *frame_worker_thread(void *arg)
168 PerThreadContext *p = arg;
169 AVCodecContext *avctx = p->avctx;
170 const AVCodec *codec = avctx->codec;
172 pthread_mutex_lock(&p->mutex);
174 while (atomic_load(&p->state) == STATE_INPUT_READY && !p->die)
175 pthread_cond_wait(&p->input_cond, &p->mutex);
179 if (!codec->update_thread_context && THREAD_SAFE_CALLBACKS(avctx))
180 ff_thread_finish_setup(avctx);
182 /* If a decoder supports hwaccel, then it must call ff_get_format().
183 * Since that call must happen before ff_thread_finish_setup(), the
184 * decoder is required to implement update_thread_context() and call
185 * ff_thread_finish_setup() manually. Therefore the above
186 * ff_thread_finish_setup() call did not happen and hwaccel_serializing
187 * cannot be true here. */
188 av_assert0(!p->hwaccel_serializing);
190 /* if the previous thread uses hwaccel then we take the lock to ensure
191 * the threads don't run concurrently */
192 if (avctx->hwaccel) {
193 pthread_mutex_lock(&p->parent->hwaccel_mutex);
194 p->hwaccel_serializing = 1;
197 av_frame_unref(p->frame);
199 p->result = codec->decode(avctx, p->frame, &p->got_frame, &p->avpkt);
201 if ((p->result < 0 || !p->got_frame) && p->frame->buf[0]) {
202 if (avctx->internal->allocate_progress)
203 av_log(avctx, AV_LOG_ERROR, "A frame threaded decoder did not "
204 "free the frame on failure. This is a bug, please report it.\n");
205 av_frame_unref(p->frame);
208 if (atomic_load(&p->state) == STATE_SETTING_UP)
209 ff_thread_finish_setup(avctx);
211 if (p->hwaccel_serializing) {
212 p->hwaccel_serializing = 0;
213 pthread_mutex_unlock(&p->parent->hwaccel_mutex);
216 if (p->async_serializing) {
217 p->async_serializing = 0;
219 async_unlock(p->parent);
222 pthread_mutex_lock(&p->progress_mutex);
224 atomic_store(&p->state, STATE_INPUT_READY);
226 pthread_cond_broadcast(&p->progress_cond);
227 pthread_cond_signal(&p->output_cond);
228 pthread_mutex_unlock(&p->progress_mutex);
230 pthread_mutex_unlock(&p->mutex);
236 * Update the next thread's AVCodecContext with values from the reference thread's context.
238 * @param dst The destination context.
239 * @param src The source context.
240 * @param for_user 0 if the destination is a codec thread, 1 if the destination is the user's thread
241 * @return 0 on success, negative error code on failure
243 static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src, int for_user)
247 if (dst != src && (for_user || !(av_codec_get_codec_descriptor(src)->props & AV_CODEC_PROP_INTRA_ONLY))) {
248 dst->time_base = src->time_base;
249 dst->framerate = src->framerate;
250 dst->width = src->width;
251 dst->height = src->height;
252 dst->pix_fmt = src->pix_fmt;
254 dst->coded_width = src->coded_width;
255 dst->coded_height = src->coded_height;
257 dst->has_b_frames = src->has_b_frames;
258 dst->idct_algo = src->idct_algo;
260 dst->bits_per_coded_sample = src->bits_per_coded_sample;
261 dst->sample_aspect_ratio = src->sample_aspect_ratio;
263 FF_DISABLE_DEPRECATION_WARNINGS
264 dst->dtg_active_format = src->dtg_active_format;
265 FF_ENABLE_DEPRECATION_WARNINGS
266 #endif /* FF_API_AFD */
268 dst->profile = src->profile;
269 dst->level = src->level;
271 dst->bits_per_raw_sample = src->bits_per_raw_sample;
272 dst->ticks_per_frame = src->ticks_per_frame;
273 dst->color_primaries = src->color_primaries;
275 dst->color_trc = src->color_trc;
276 dst->colorspace = src->colorspace;
277 dst->color_range = src->color_range;
278 dst->chroma_sample_location = src->chroma_sample_location;
280 dst->hwaccel = src->hwaccel;
281 dst->hwaccel_context = src->hwaccel_context;
283 dst->channels = src->channels;
284 dst->sample_rate = src->sample_rate;
285 dst->sample_fmt = src->sample_fmt;
286 dst->channel_layout = src->channel_layout;
287 dst->internal->hwaccel_priv_data = src->internal->hwaccel_priv_data;
289 if (!!dst->hw_frames_ctx != !!src->hw_frames_ctx ||
290 (dst->hw_frames_ctx && dst->hw_frames_ctx->data != src->hw_frames_ctx->data)) {
291 av_buffer_unref(&dst->hw_frames_ctx);
293 if (src->hw_frames_ctx) {
294 dst->hw_frames_ctx = av_buffer_ref(src->hw_frames_ctx);
295 if (!dst->hw_frames_ctx)
296 return AVERROR(ENOMEM);
300 dst->hwaccel_flags = src->hwaccel_flags;
304 dst->delay = src->thread_count - 1;
305 #if FF_API_CODED_FRAME
306 FF_DISABLE_DEPRECATION_WARNINGS
307 dst->coded_frame = src->coded_frame;
308 FF_ENABLE_DEPRECATION_WARNINGS
311 if (dst->codec->update_thread_context)
312 err = dst->codec->update_thread_context(dst, src);
319 * Update the next thread's AVCodecContext with values set by the user.
321 * @param dst The destination context.
322 * @param src The source context.
323 * @return 0 on success, negative error code on failure
325 static int update_context_from_user(AVCodecContext *dst, AVCodecContext *src)
327 #define copy_fields(s, e) memcpy(&dst->s, &src->s, (char*)&dst->e - (char*)&dst->s);
328 dst->flags = src->flags;
330 dst->draw_horiz_band= src->draw_horiz_band;
331 dst->get_buffer2 = src->get_buffer2;
333 dst->opaque = src->opaque;
334 dst->debug = src->debug;
335 dst->debug_mv = src->debug_mv;
337 dst->slice_flags = src->slice_flags;
338 dst->flags2 = src->flags2;
340 copy_fields(skip_loop_filter, subtitle_header);
342 dst->frame_number = src->frame_number;
343 dst->reordered_opaque = src->reordered_opaque;
344 dst->thread_safe_callbacks = src->thread_safe_callbacks;
346 if (src->slice_count && src->slice_offset) {
347 if (dst->slice_count < src->slice_count) {
348 int err = av_reallocp_array(&dst->slice_offset, src->slice_count,
349 sizeof(*dst->slice_offset));
353 memcpy(dst->slice_offset, src->slice_offset,
354 src->slice_count * sizeof(*dst->slice_offset));
356 dst->slice_count = src->slice_count;
361 /// Releases the buffers that this decoding thread was the last user of.
362 static void release_delayed_buffers(PerThreadContext *p)
364 FrameThreadContext *fctx = p->parent;
366 while (p->num_released_buffers > 0) {
369 pthread_mutex_lock(&fctx->buffer_mutex);
371 // fix extended data in case the caller screwed it up
372 av_assert0(p->avctx->codec_type == AVMEDIA_TYPE_VIDEO ||
373 p->avctx->codec_type == AVMEDIA_TYPE_AUDIO);
374 f = &p->released_buffers[--p->num_released_buffers];
375 f->extended_data = f->data;
378 pthread_mutex_unlock(&fctx->buffer_mutex);
382 static int submit_packet(PerThreadContext *p, AVPacket *avpkt)
384 FrameThreadContext *fctx = p->parent;
385 PerThreadContext *prev_thread = fctx->prev_thread;
386 const AVCodec *codec = p->avctx->codec;
389 if (!avpkt->size && !(codec->capabilities & AV_CODEC_CAP_DELAY))
392 pthread_mutex_lock(&p->mutex);
394 release_delayed_buffers(p);
398 if (atomic_load(&prev_thread->state) == STATE_SETTING_UP) {
399 pthread_mutex_lock(&prev_thread->progress_mutex);
400 while (atomic_load(&prev_thread->state) == STATE_SETTING_UP)
401 pthread_cond_wait(&prev_thread->progress_cond, &prev_thread->progress_mutex);
402 pthread_mutex_unlock(&prev_thread->progress_mutex);
405 err = update_context_from_thread(p->avctx, prev_thread->avctx, 0);
407 pthread_mutex_unlock(&p->mutex);
412 av_packet_unref(&p->avpkt);
413 ret = av_packet_ref(&p->avpkt, avpkt);
415 pthread_mutex_unlock(&p->mutex);
416 av_log(p->avctx, AV_LOG_ERROR, "av_packet_ref() failed in submit_packet()\n");
420 atomic_store(&p->state, STATE_SETTING_UP);
421 pthread_cond_signal(&p->input_cond);
422 pthread_mutex_unlock(&p->mutex);
425 * If the client doesn't have a thread-safe get_buffer(),
426 * then decoding threads call back to the main thread,
427 * and it calls back to the client here.
430 if (!p->avctx->thread_safe_callbacks && (
431 p->avctx->get_format != avcodec_default_get_format ||
432 p->avctx->get_buffer2 != avcodec_default_get_buffer2)) {
433 while (atomic_load(&p->state) != STATE_SETUP_FINISHED && atomic_load(&p->state) != STATE_INPUT_READY) {
435 pthread_mutex_lock(&p->progress_mutex);
436 while (atomic_load(&p->state) == STATE_SETTING_UP)
437 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
439 switch (atomic_load_explicit(&p->state, memory_order_acquire)) {
440 case STATE_GET_BUFFER:
441 p->result = ff_get_buffer(p->avctx, p->requested_frame, p->requested_flags);
443 case STATE_GET_FORMAT:
444 p->result_format = ff_get_format(p->avctx, p->available_formats);
451 atomic_store(&p->state, STATE_SETTING_UP);
452 pthread_cond_signal(&p->progress_cond);
454 pthread_mutex_unlock(&p->progress_mutex);
458 fctx->prev_thread = p;
459 fctx->next_decoding++;
464 int ff_thread_decode_frame(AVCodecContext *avctx,
465 AVFrame *picture, int *got_picture_ptr,
468 FrameThreadContext *fctx = avctx->internal->thread_ctx;
469 int finished = fctx->next_finished;
473 /* release the async lock, permitting blocked hwaccel threads to
474 * go forward while we are in this function */
478 * Submit a packet to the next decoding thread.
481 p = &fctx->threads[fctx->next_decoding];
482 err = update_context_from_user(p->avctx, avctx);
485 err = submit_packet(p, avpkt);
490 * If we're still receiving the initial packets, don't return a frame.
493 if (fctx->next_decoding > (avctx->thread_count-1-(avctx->codec_id == AV_CODEC_ID_FFV1)))
496 if (fctx->delaying) {
505 * Return the next available frame from the oldest thread.
506 * If we're at the end of the stream, then we have to skip threads that
507 * didn't output a frame, because we don't want to accidentally signal
508 * EOF (avpkt->size == 0 && *got_picture_ptr == 0).
512 p = &fctx->threads[finished++];
514 if (atomic_load(&p->state) != STATE_INPUT_READY) {
515 pthread_mutex_lock(&p->progress_mutex);
516 while (atomic_load_explicit(&p->state, memory_order_relaxed) != STATE_INPUT_READY)
517 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
518 pthread_mutex_unlock(&p->progress_mutex);
521 av_frame_move_ref(picture, p->frame);
522 *got_picture_ptr = p->got_frame;
523 picture->pkt_dts = p->avpkt.dts;
529 * A later call with avkpt->size == 0 may loop over all threads,
530 * including this one, searching for a frame to return before being
531 * stopped by the "finished != fctx->next_finished" condition.
532 * Make sure we don't mistakenly return the same frame again.
536 if (finished >= avctx->thread_count) finished = 0;
537 } while (!avpkt->size && !*got_picture_ptr && finished != fctx->next_finished);
539 update_context_from_thread(avctx, p->avctx, 1);
541 if (fctx->next_decoding >= avctx->thread_count) fctx->next_decoding = 0;
543 fctx->next_finished = finished;
545 /* return the size of the consumed packet if no error occurred */
553 void ff_thread_report_progress(ThreadFrame *f, int n, int field)
556 atomic_int *progress = f->progress ? (atomic_int*)f->progress->data : NULL;
559 atomic_load_explicit(&progress[field], memory_order_relaxed) >= n)
562 p = f->owner->internal->thread_ctx;
564 if (f->owner->debug&FF_DEBUG_THREADS)
565 av_log(f->owner, AV_LOG_DEBUG, "%p finished %d field %d\n", progress, n, field);
567 pthread_mutex_lock(&p->progress_mutex);
569 atomic_store_explicit(&progress[field], n, memory_order_release);
571 pthread_cond_broadcast(&p->progress_cond);
572 pthread_mutex_unlock(&p->progress_mutex);
575 void ff_thread_await_progress(ThreadFrame *f, int n, int field)
578 atomic_int *progress = f->progress ? (atomic_int*)f->progress->data : NULL;
581 atomic_load_explicit(&progress[field], memory_order_acquire) >= n)
584 p = f->owner->internal->thread_ctx;
586 if (f->owner->debug&FF_DEBUG_THREADS)
587 av_log(f->owner, AV_LOG_DEBUG, "thread awaiting %d field %d from %p\n", n, field, progress);
589 pthread_mutex_lock(&p->progress_mutex);
590 while (atomic_load_explicit(&progress[field], memory_order_relaxed) < n)
591 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
592 pthread_mutex_unlock(&p->progress_mutex);
595 void ff_thread_finish_setup(AVCodecContext *avctx) {
596 PerThreadContext *p = avctx->internal->thread_ctx;
598 if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
600 if (avctx->hwaccel && !p->hwaccel_serializing) {
601 pthread_mutex_lock(&p->parent->hwaccel_mutex);
602 p->hwaccel_serializing = 1;
605 /* this assumes that no hwaccel calls happen before ff_thread_finish_setup() */
606 if (avctx->hwaccel &&
607 !(avctx->hwaccel->caps_internal & HWACCEL_CAP_ASYNC_SAFE)) {
608 p->async_serializing = 1;
610 async_lock(p->parent);
613 pthread_mutex_lock(&p->progress_mutex);
614 if(atomic_load(&p->state) == STATE_SETUP_FINISHED){
615 av_log(avctx, AV_LOG_WARNING, "Multiple ff_thread_finish_setup() calls\n");
618 atomic_store(&p->state, STATE_SETUP_FINISHED);
620 pthread_cond_broadcast(&p->progress_cond);
621 pthread_mutex_unlock(&p->progress_mutex);
624 /// Waits for all threads to finish.
625 static void park_frame_worker_threads(FrameThreadContext *fctx, int thread_count)
631 for (i = 0; i < thread_count; i++) {
632 PerThreadContext *p = &fctx->threads[i];
634 if (atomic_load(&p->state) != STATE_INPUT_READY) {
635 pthread_mutex_lock(&p->progress_mutex);
636 while (atomic_load(&p->state) != STATE_INPUT_READY)
637 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
638 pthread_mutex_unlock(&p->progress_mutex);
646 void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
648 FrameThreadContext *fctx = avctx->internal->thread_ctx;
649 const AVCodec *codec = avctx->codec;
652 park_frame_worker_threads(fctx, thread_count);
654 if (fctx->prev_thread && fctx->prev_thread != fctx->threads)
655 if (update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0) < 0) {
656 av_log(avctx, AV_LOG_ERROR, "Final thread update failed\n");
657 fctx->prev_thread->avctx->internal->is_copy = fctx->threads->avctx->internal->is_copy;
658 fctx->threads->avctx->internal->is_copy = 1;
661 for (i = 0; i < thread_count; i++) {
662 PerThreadContext *p = &fctx->threads[i];
664 pthread_mutex_lock(&p->mutex);
666 pthread_cond_signal(&p->input_cond);
667 pthread_mutex_unlock(&p->mutex);
670 pthread_join(p->thread, NULL);
673 if (codec->close && p->avctx)
674 codec->close(p->avctx);
676 release_delayed_buffers(p);
677 av_frame_free(&p->frame);
680 for (i = 0; i < thread_count; i++) {
681 PerThreadContext *p = &fctx->threads[i];
683 pthread_mutex_destroy(&p->mutex);
684 pthread_mutex_destroy(&p->progress_mutex);
685 pthread_cond_destroy(&p->input_cond);
686 pthread_cond_destroy(&p->progress_cond);
687 pthread_cond_destroy(&p->output_cond);
688 av_packet_unref(&p->avpkt);
689 av_freep(&p->released_buffers);
692 av_freep(&p->avctx->priv_data);
693 av_freep(&p->avctx->slice_offset);
697 av_freep(&p->avctx->internal);
698 av_buffer_unref(&p->avctx->hw_frames_ctx);
704 av_freep(&fctx->threads);
705 pthread_mutex_destroy(&fctx->buffer_mutex);
706 pthread_mutex_destroy(&fctx->hwaccel_mutex);
707 pthread_mutex_destroy(&fctx->async_mutex);
708 pthread_cond_destroy(&fctx->async_cond);
710 av_freep(&avctx->internal->thread_ctx);
712 if (avctx->priv_data && avctx->codec && avctx->codec->priv_class)
713 av_opt_free(avctx->priv_data);
717 int ff_frame_thread_init(AVCodecContext *avctx)
719 int thread_count = avctx->thread_count;
720 const AVCodec *codec = avctx->codec;
721 AVCodecContext *src = avctx;
722 FrameThreadContext *fctx;
730 int nb_cpus = av_cpu_count();
731 if ((avctx->debug & (FF_DEBUG_VIS_QP | FF_DEBUG_VIS_MB_TYPE)) || avctx->debug_mv)
733 // use number of cores + 1 as thread count if there is more than one
735 thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
737 thread_count = avctx->thread_count = 1;
740 if (thread_count <= 1) {
741 avctx->active_thread_type = 0;
745 avctx->internal->thread_ctx = fctx = av_mallocz(sizeof(FrameThreadContext));
747 return AVERROR(ENOMEM);
749 fctx->threads = av_mallocz_array(thread_count, sizeof(PerThreadContext));
750 if (!fctx->threads) {
751 av_freep(&avctx->internal->thread_ctx);
752 return AVERROR(ENOMEM);
755 pthread_mutex_init(&fctx->buffer_mutex, NULL);
756 pthread_mutex_init(&fctx->hwaccel_mutex, NULL);
757 pthread_mutex_init(&fctx->async_mutex, NULL);
758 pthread_cond_init(&fctx->async_cond, NULL);
760 fctx->async_lock = 1;
763 for (i = 0; i < thread_count; i++) {
764 AVCodecContext *copy = av_malloc(sizeof(AVCodecContext));
765 PerThreadContext *p = &fctx->threads[i];
767 pthread_mutex_init(&p->mutex, NULL);
768 pthread_mutex_init(&p->progress_mutex, NULL);
769 pthread_cond_init(&p->input_cond, NULL);
770 pthread_cond_init(&p->progress_cond, NULL);
771 pthread_cond_init(&p->output_cond, NULL);
773 p->frame = av_frame_alloc();
776 err = AVERROR(ENOMEM);
784 err = AVERROR(ENOMEM);
790 copy->internal = av_malloc(sizeof(AVCodecInternal));
791 if (!copy->internal) {
792 copy->priv_data = NULL;
793 err = AVERROR(ENOMEM);
796 *copy->internal = *src->internal;
797 copy->internal->thread_ctx = p;
798 copy->internal->pkt = &p->avpkt;
804 err = codec->init(copy);
806 update_context_from_thread(avctx, copy, 1);
808 copy->priv_data = av_malloc(codec->priv_data_size);
809 if (!copy->priv_data) {
810 err = AVERROR(ENOMEM);
813 memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
814 copy->internal->is_copy = 1;
816 if (codec->init_thread_copy)
817 err = codec->init_thread_copy(copy);
822 err = AVERROR(pthread_create(&p->thread, NULL, frame_worker_thread, p));
823 p->thread_init= !err;
831 ff_frame_thread_free(avctx, i+1);
836 void ff_thread_flush(AVCodecContext *avctx)
839 FrameThreadContext *fctx = avctx->internal->thread_ctx;
843 park_frame_worker_threads(fctx, avctx->thread_count);
844 if (fctx->prev_thread) {
845 if (fctx->prev_thread != &fctx->threads[0])
846 update_context_from_thread(fctx->threads[0].avctx, fctx->prev_thread->avctx, 0);
849 fctx->next_decoding = fctx->next_finished = 0;
851 fctx->prev_thread = NULL;
852 for (i = 0; i < avctx->thread_count; i++) {
853 PerThreadContext *p = &fctx->threads[i];
854 // Make sure decode flush calls with size=0 won't return old frames
856 av_frame_unref(p->frame);
858 release_delayed_buffers(p);
860 if (avctx->codec->flush)
861 avctx->codec->flush(p->avctx);
865 int ff_thread_can_start_frame(AVCodecContext *avctx)
867 PerThreadContext *p = avctx->internal->thread_ctx;
868 if ((avctx->active_thread_type&FF_THREAD_FRAME) && atomic_load(&p->state) != STATE_SETTING_UP &&
869 (avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {
875 static int thread_get_buffer_internal(AVCodecContext *avctx, ThreadFrame *f, int flags)
877 PerThreadContext *p = avctx->internal->thread_ctx;
882 ff_init_buffer_info(avctx, f->f);
884 if (!(avctx->active_thread_type & FF_THREAD_FRAME))
885 return ff_get_buffer(avctx, f->f, flags);
887 if (atomic_load(&p->state) != STATE_SETTING_UP &&
888 (avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {
889 av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
893 if (avctx->internal->allocate_progress) {
894 atomic_int *progress;
895 f->progress = av_buffer_alloc(2 * sizeof(*progress));
897 return AVERROR(ENOMEM);
899 progress = (atomic_int*)f->progress->data;
901 atomic_init(&progress[0], -1);
902 atomic_init(&progress[1], -1);
905 pthread_mutex_lock(&p->parent->buffer_mutex);
906 if (avctx->thread_safe_callbacks ||
907 avctx->get_buffer2 == avcodec_default_get_buffer2) {
908 err = ff_get_buffer(avctx, f->f, flags);
910 pthread_mutex_lock(&p->progress_mutex);
911 p->requested_frame = f->f;
912 p->requested_flags = flags;
913 atomic_store_explicit(&p->state, STATE_GET_BUFFER, memory_order_release);
914 pthread_cond_broadcast(&p->progress_cond);
916 while (atomic_load(&p->state) != STATE_SETTING_UP)
917 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
921 pthread_mutex_unlock(&p->progress_mutex);
924 if (!THREAD_SAFE_CALLBACKS(avctx) && !avctx->codec->update_thread_context)
925 ff_thread_finish_setup(avctx);
927 av_buffer_unref(&f->progress);
929 pthread_mutex_unlock(&p->parent->buffer_mutex);
934 enum AVPixelFormat ff_thread_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
936 enum AVPixelFormat res;
937 PerThreadContext *p = avctx->internal->thread_ctx;
938 if (!(avctx->active_thread_type & FF_THREAD_FRAME) || avctx->thread_safe_callbacks ||
939 avctx->get_format == avcodec_default_get_format)
940 return ff_get_format(avctx, fmt);
941 if (atomic_load(&p->state) != STATE_SETTING_UP) {
942 av_log(avctx, AV_LOG_ERROR, "get_format() cannot be called after ff_thread_finish_setup()\n");
945 pthread_mutex_lock(&p->progress_mutex);
946 p->available_formats = fmt;
947 atomic_store(&p->state, STATE_GET_FORMAT);
948 pthread_cond_broadcast(&p->progress_cond);
950 while (atomic_load(&p->state) != STATE_SETTING_UP)
951 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
953 res = p->result_format;
955 pthread_mutex_unlock(&p->progress_mutex);
960 int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
962 int ret = thread_get_buffer_internal(avctx, f, flags);
964 av_log(avctx, AV_LOG_ERROR, "thread_get_buffer() failed\n");
968 void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
970 PerThreadContext *p = avctx->internal->thread_ctx;
971 FrameThreadContext *fctx;
973 int can_direct_free = !(avctx->active_thread_type & FF_THREAD_FRAME) ||
974 avctx->thread_safe_callbacks ||
975 avctx->get_buffer2 == avcodec_default_get_buffer2;
977 if (!f->f || !f->f->buf[0])
980 if (avctx->debug & FF_DEBUG_BUFFERS)
981 av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p\n", f);
983 av_buffer_unref(&f->progress);
986 if (can_direct_free) {
987 av_frame_unref(f->f);
992 pthread_mutex_lock(&fctx->buffer_mutex);
994 if (p->num_released_buffers + 1 >= INT_MAX / sizeof(*p->released_buffers))
996 tmp = av_fast_realloc(p->released_buffers, &p->released_buffers_allocated,
997 (p->num_released_buffers + 1) *
998 sizeof(*p->released_buffers));
1001 p->released_buffers = tmp;
1003 dst = &p->released_buffers[p->num_released_buffers];
1004 av_frame_move_ref(dst, f->f);
1006 p->num_released_buffers++;
1009 pthread_mutex_unlock(&fctx->buffer_mutex);