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 FFmpeg.
11
* FFmpeg 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
* FFmpeg 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 FFmpeg; 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
37
typedef int (action_func)(AVCodecContext *c, void *arg);
38
typedef int (action_func2)(AVCodecContext *c, void *arg, int jobnr, int threadnr);
40
typedef struct ThreadContext {
50
pthread_cond_t last_job_cond;
51
pthread_cond_t current_job_cond;
52
pthread_mutex_t current_job_lock;
57
/// Max number of frame buffers that can be allocated when using frame threads.
58
#define MAX_BUFFERS 32
61
* Context used by codec threads and stored in their AVCodecContext thread_opaque.
63
typedef struct PerThreadContext {
64
struct FrameThreadContext *parent;
67
pthread_cond_t input_cond; ///< Used to wait for a new frame from the main thread.
68
pthread_cond_t progress_cond; ///< Used by child threads to wait for progress to change.
69
pthread_cond_t output_cond; ///< Used by the main thread to wait for frames to finish.
71
pthread_mutex_t mutex; ///< Mutex used to protect the contents of the PerThreadContext.
72
pthread_mutex_t progress_mutex; ///< Mutex used to protect frame progress values and progress_cond.
74
AVCodecContext *avctx; ///< Context used to decode frames passed to this thread.
76
AVPacket avpkt; ///< Input frame (for decoding) or output (for encoding).
77
int allocated_buf_size; ///< Size allocated for avpkt.data
79
AVFrame picture; ///< Output picture (for decoding) or input (for encoding).
80
int got_picture; ///< The output of got_picture_ptr from the last avcodec_decode_video() call.
81
int result; ///< The result of the last codec decode/encode() call.
84
STATE_INPUT_READY, ///< Set when the thread is awaiting a frame.
85
STATE_SETTING_UP, ///< Set before the codec has called ff_thread_finish_setup().
87
* Set when the codec calls get_buffer().
88
* State is returned to STATE_SETTING_UP afterwards.
90
STATE_SETUP_FINISHED ///< Set after the codec has called ff_thread_finish_setup().
94
* Array of frames passed to ff_thread_release_buffer().
95
* Frames are released after all threads referencing them are finished.
97
AVFrame released_buffers[MAX_BUFFERS];
98
int num_released_buffers;
101
* Array of progress values used by ff_thread_get_buffer().
103
int progress[MAX_BUFFERS][2];
104
uint8_t progress_used[MAX_BUFFERS];
106
AVFrame *requested_frame; ///< AVFrame the codec passed to get_buffer()
110
* Context stored in the client AVCodecContext thread_opaque.
112
typedef struct FrameThreadContext {
113
PerThreadContext *threads; ///< The contexts for each thread.
114
PerThreadContext *prev_thread; ///< The last thread submit_frame() was called on.
116
pthread_mutex_t buffer_mutex; ///< Mutex used to protect get/release_buffer().
118
int next_decoding; ///< The next context to submit a frame to.
119
int next_finished; ///< The next context to return output from.
122
* Set for the first N frames, where N is the number of threads.
123
* While it is set, ff_en/decode_frame_threaded won't return any results.
126
int die; ///< Set when threads should exit.
127
} FrameThreadContext;
129
static void* attribute_align_arg worker(void *v)
131
AVCodecContext *avctx = v;
132
ThreadContext *c = avctx->thread_opaque;
133
int our_job = c->job_count;
134
int thread_count = avctx->thread_count;
137
pthread_mutex_lock(&c->current_job_lock);
138
self_id = c->current_job++;
140
while (our_job >= c->job_count) {
141
if (c->current_job == thread_count + c->job_count)
142
pthread_cond_signal(&c->last_job_cond);
144
pthread_cond_wait(&c->current_job_cond, &c->current_job_lock);
148
pthread_mutex_unlock(&c->current_job_lock);
152
pthread_mutex_unlock(&c->current_job_lock);
154
c->rets[our_job%c->rets_count] = c->func ? c->func(avctx, (char*)c->args + our_job*c->job_size):
155
c->func2(avctx, c->args, our_job, self_id);
157
pthread_mutex_lock(&c->current_job_lock);
158
our_job = c->current_job++;
162
static av_always_inline void avcodec_thread_park_workers(ThreadContext *c, int thread_count)
164
pthread_cond_wait(&c->last_job_cond, &c->current_job_lock);
165
pthread_mutex_unlock(&c->current_job_lock);
168
static void thread_free(AVCodecContext *avctx)
170
ThreadContext *c = avctx->thread_opaque;
173
pthread_mutex_lock(&c->current_job_lock);
175
pthread_cond_broadcast(&c->current_job_cond);
176
pthread_mutex_unlock(&c->current_job_lock);
178
for (i=0; i<avctx->thread_count; i++)
179
pthread_join(c->workers[i], NULL);
181
pthread_mutex_destroy(&c->current_job_lock);
182
pthread_cond_destroy(&c->current_job_cond);
183
pthread_cond_destroy(&c->last_job_cond);
185
av_freep(&avctx->thread_opaque);
188
static int avcodec_thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size)
190
ThreadContext *c= avctx->thread_opaque;
193
if (!(avctx->active_thread_type&FF_THREAD_SLICE) || avctx->thread_count <= 1)
194
return avcodec_default_execute(avctx, func, arg, ret, job_count, job_size);
199
pthread_mutex_lock(&c->current_job_lock);
201
c->current_job = avctx->thread_count;
202
c->job_count = job_count;
203
c->job_size = job_size;
208
c->rets_count = job_count;
210
c->rets = &dummy_ret;
213
pthread_cond_broadcast(&c->current_job_cond);
215
avcodec_thread_park_workers(c, avctx->thread_count);
220
static int avcodec_thread_execute2(AVCodecContext *avctx, action_func2* func2, void *arg, int *ret, int job_count)
222
ThreadContext *c= avctx->thread_opaque;
224
return avcodec_thread_execute(avctx, NULL, arg, ret, job_count, 0);
227
static int thread_init(AVCodecContext *avctx)
231
int thread_count = avctx->thread_count;
233
avctx->thread_count = thread_count;
235
if (thread_count <= 1)
238
c = av_mallocz(sizeof(ThreadContext));
242
c->workers = av_mallocz(sizeof(pthread_t)*thread_count);
248
avctx->thread_opaque = c;
253
pthread_cond_init(&c->current_job_cond, NULL);
254
pthread_cond_init(&c->last_job_cond, NULL);
255
pthread_mutex_init(&c->current_job_lock, NULL);
256
pthread_mutex_lock(&c->current_job_lock);
257
for (i=0; i<thread_count; i++) {
258
if(pthread_create(&c->workers[i], NULL, worker, avctx)) {
259
avctx->thread_count = i;
260
pthread_mutex_unlock(&c->current_job_lock);
261
avcodec_thread_free(avctx);
266
avcodec_thread_park_workers(c, thread_count);
268
avctx->execute = avcodec_thread_execute;
269
avctx->execute2 = avcodec_thread_execute2;
274
* Codec worker thread.
276
* Automatically calls ff_thread_finish_setup() if the codec does
277
* not provide an update_thread_context method, or if the codec returns
280
static attribute_align_arg void *frame_worker_thread(void *arg)
282
PerThreadContext *p = arg;
283
FrameThreadContext *fctx = p->parent;
284
AVCodecContext *avctx = p->avctx;
285
AVCodec *codec = avctx->codec;
288
if (p->state == STATE_INPUT_READY && !fctx->die) {
289
pthread_mutex_lock(&p->mutex);
290
while (p->state == STATE_INPUT_READY && !fctx->die)
291
pthread_cond_wait(&p->input_cond, &p->mutex);
292
pthread_mutex_unlock(&p->mutex);
295
if (fctx->die) break;
297
if (!codec->update_thread_context) ff_thread_finish_setup(avctx);
299
pthread_mutex_lock(&p->mutex);
300
avcodec_get_frame_defaults(&p->picture);
302
p->result = codec->decode(avctx, &p->picture, &p->got_picture, &p->avpkt);
304
if (p->state == STATE_SETTING_UP) ff_thread_finish_setup(avctx);
306
p->state = STATE_INPUT_READY;
308
pthread_mutex_lock(&p->progress_mutex);
309
pthread_cond_signal(&p->output_cond);
310
pthread_mutex_unlock(&p->progress_mutex);
312
pthread_mutex_unlock(&p->mutex);
319
* Updates the next thread's AVCodecContext with values from the reference thread's context.
321
* @param dst The destination context.
322
* @param src The source context.
323
* @param for_user 0 if the destination is a codec thread, 1 if the destination is the user's thread
325
static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src, int for_user)
330
dst->sub_id = src->sub_id;
331
dst->time_base = src->time_base;
332
dst->width = src->width;
333
dst->height = src->height;
334
dst->pix_fmt = src->pix_fmt;
336
dst->has_b_frames = src->has_b_frames;
337
dst->idct_algo = src->idct_algo;
338
dst->slice_count = src->slice_count;
340
dst->bits_per_coded_sample = src->bits_per_coded_sample;
341
dst->sample_aspect_ratio = src->sample_aspect_ratio;
342
dst->dtg_active_format = src->dtg_active_format;
344
dst->profile = src->profile;
345
dst->level = src->level;
347
dst->bits_per_raw_sample = src->bits_per_raw_sample;
348
dst->ticks_per_frame = src->ticks_per_frame;
349
dst->color_primaries = src->color_primaries;
351
dst->color_trc = src->color_trc;
352
dst->colorspace = src->colorspace;
353
dst->color_range = src->color_range;
354
dst->chroma_sample_location = src->chroma_sample_location;
358
dst->coded_frame = src->coded_frame;
359
dst->has_b_frames += src->thread_count - 1;
361
if (dst->codec->update_thread_context)
362
err = dst->codec->update_thread_context(dst, src);
369
* Update the next thread's AVCodecContext with values set by the user.
371
* @param dst The destination context.
372
* @param src The source context.
374
static void update_context_from_user(AVCodecContext *dst, AVCodecContext *src)
376
#define copy_fields(s, e) memcpy(&dst->s, &src->s, (char*)&dst->e - (char*)&dst->s);
377
dst->flags = src->flags;
379
dst->draw_horiz_band= src->draw_horiz_band;
380
dst->get_buffer = src->get_buffer;
381
dst->release_buffer = src->release_buffer;
383
dst->opaque = src->opaque;
384
dst->hurry_up = src->hurry_up;
385
dst->dsp_mask = src->dsp_mask;
386
dst->debug = src->debug;
387
dst->debug_mv = src->debug_mv;
389
dst->slice_flags = src->slice_flags;
390
dst->flags2 = src->flags2;
392
copy_fields(skip_loop_filter, bidir_refine);
394
dst->frame_number = src->frame_number;
395
dst->reordered_opaque = src->reordered_opaque;
399
static void free_progress(AVFrame *f)
401
PerThreadContext *p = f->owner->thread_opaque;
402
int *progress = f->thread_opaque;
404
p->progress_used[(progress - p->progress[0]) / 2] = 0;
407
/// Releases the buffers that this decoding thread was the last user of.
408
static void release_delayed_buffers(PerThreadContext *p)
410
FrameThreadContext *fctx = p->parent;
412
while (p->num_released_buffers > 0) {
413
AVFrame *f = &p->released_buffers[--p->num_released_buffers];
415
pthread_mutex_lock(&fctx->buffer_mutex);
417
f->thread_opaque = NULL;
419
f->owner->release_buffer(f->owner, f);
420
pthread_mutex_unlock(&fctx->buffer_mutex);
424
static int submit_frame(PerThreadContext *p, AVPacket *avpkt)
426
FrameThreadContext *fctx = p->parent;
427
PerThreadContext *prev_thread = fctx->prev_thread;
428
AVCodec *codec = p->avctx->codec;
429
uint8_t *buf = p->avpkt.data;
431
if (!avpkt->size && !(codec->capabilities & CODEC_CAP_DELAY)) return 0;
433
pthread_mutex_lock(&p->mutex);
435
release_delayed_buffers(p);
439
if (prev_thread->state == STATE_SETTING_UP) {
440
pthread_mutex_lock(&prev_thread->progress_mutex);
441
while (prev_thread->state == STATE_SETTING_UP)
442
pthread_cond_wait(&prev_thread->progress_cond, &prev_thread->progress_mutex);
443
pthread_mutex_unlock(&prev_thread->progress_mutex);
446
err = update_context_from_thread(p->avctx, prev_thread->avctx, 0);
448
pthread_mutex_unlock(&p->mutex);
453
av_fast_malloc(&buf, &p->allocated_buf_size, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
456
memcpy(buf, avpkt->data, avpkt->size);
457
memset(buf + avpkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
459
p->state = STATE_SETTING_UP;
460
pthread_cond_signal(&p->input_cond);
461
pthread_mutex_unlock(&p->mutex);
464
* If the client doesn't have a thread-safe get_buffer(),
465
* then decoding threads call back to the main thread,
466
* and it calls back to the client here.
469
if (!p->avctx->thread_safe_callbacks &&
470
p->avctx->get_buffer != avcodec_default_get_buffer) {
471
while (p->state != STATE_SETUP_FINISHED && p->state != STATE_INPUT_READY) {
472
pthread_mutex_lock(&p->progress_mutex);
473
while (p->state == STATE_SETTING_UP)
474
pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
476
if (p->state == STATE_GET_BUFFER) {
477
p->result = p->avctx->get_buffer(p->avctx, p->requested_frame);
478
p->state = STATE_SETTING_UP;
479
pthread_cond_signal(&p->progress_cond);
481
pthread_mutex_unlock(&p->progress_mutex);
485
fctx->prev_thread = p;
490
int ff_thread_decode_frame(AVCodecContext *avctx,
491
AVFrame *picture, int *got_picture_ptr,
494
FrameThreadContext *fctx = avctx->thread_opaque;
495
int finished = fctx->next_finished;
500
* Submit a frame to the next decoding thread.
503
p = &fctx->threads[fctx->next_decoding];
504
update_context_from_user(p->avctx, avctx);
505
err = submit_frame(p, avpkt);
508
fctx->next_decoding++;
511
* If we're still receiving the initial frames, don't return a picture.
514
if (fctx->delaying && avpkt->size) {
515
if (fctx->next_decoding >= (avctx->thread_count-1)) fctx->delaying = 0;
522
* Return the next available picture from the oldest thread.
523
* If we're at the end of the stream, then we have to skip threads that
524
* didn't output a picture, because we don't want to accidentally signal
525
* EOF (avpkt->size == 0 && *got_picture_ptr == 0).
529
p = &fctx->threads[finished++];
531
if (p->state != STATE_INPUT_READY) {
532
pthread_mutex_lock(&p->progress_mutex);
533
while (p->state != STATE_INPUT_READY)
534
pthread_cond_wait(&p->output_cond, &p->progress_mutex);
535
pthread_mutex_unlock(&p->progress_mutex);
538
*picture = p->picture;
539
*got_picture_ptr = p->got_picture;
540
picture->pkt_dts = p->avpkt.dts;
543
* A later call with avkpt->size == 0 may loop over all threads,
544
* including this one, searching for a frame to return before being
545
* stopped by the "finished != fctx->next_finished" condition.
546
* Make sure we don't mistakenly return the same frame again.
550
if (finished >= avctx->thread_count) finished = 0;
551
} while (!avpkt->size && !*got_picture_ptr && finished != fctx->next_finished);
553
update_context_from_thread(avctx, p->avctx, 1);
555
if (fctx->next_decoding >= avctx->thread_count) fctx->next_decoding = 0;
557
fctx->next_finished = finished;
562
void ff_thread_report_progress(AVFrame *f, int n, int field)
565
int *progress = f->thread_opaque;
567
if (!progress || progress[field] >= n) return;
569
p = f->owner->thread_opaque;
571
if (f->owner->debug&FF_DEBUG_THREADS)
572
av_log(f->owner, AV_LOG_DEBUG, "%p finished %d field %d\n", progress, n, field);
574
pthread_mutex_lock(&p->progress_mutex);
576
pthread_cond_broadcast(&p->progress_cond);
577
pthread_mutex_unlock(&p->progress_mutex);
580
void ff_thread_await_progress(AVFrame *f, int n, int field)
583
int *progress = f->thread_opaque;
585
if (!progress || progress[field] >= n) return;
587
p = f->owner->thread_opaque;
589
if (f->owner->debug&FF_DEBUG_THREADS)
590
av_log(f->owner, AV_LOG_DEBUG, "thread awaiting %d field %d from %p\n", n, field, progress);
592
pthread_mutex_lock(&p->progress_mutex);
593
while (progress[field] < n)
594
pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
595
pthread_mutex_unlock(&p->progress_mutex);
598
void ff_thread_finish_setup(AVCodecContext *avctx) {
599
PerThreadContext *p = avctx->thread_opaque;
601
if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
603
pthread_mutex_lock(&p->progress_mutex);
604
p->state = STATE_SETUP_FINISHED;
605
pthread_cond_broadcast(&p->progress_cond);
606
pthread_mutex_unlock(&p->progress_mutex);
609
/// Waits for all threads to finish.
610
static void park_frame_worker_threads(FrameThreadContext *fctx, int thread_count)
614
for (i = 0; i < thread_count; i++) {
615
PerThreadContext *p = &fctx->threads[i];
617
if (p->state != STATE_INPUT_READY) {
618
pthread_mutex_lock(&p->progress_mutex);
619
while (p->state != STATE_INPUT_READY)
620
pthread_cond_wait(&p->output_cond, &p->progress_mutex);
621
pthread_mutex_unlock(&p->progress_mutex);
626
static void frame_thread_free(AVCodecContext *avctx, int thread_count)
628
FrameThreadContext *fctx = avctx->thread_opaque;
629
AVCodec *codec = avctx->codec;
632
park_frame_worker_threads(fctx, thread_count);
634
if (fctx->prev_thread)
635
update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0);
639
for (i = 0; i < thread_count; i++) {
640
PerThreadContext *p = &fctx->threads[i];
642
pthread_mutex_lock(&p->mutex);
643
pthread_cond_signal(&p->input_cond);
644
pthread_mutex_unlock(&p->mutex);
646
pthread_join(p->thread, NULL);
649
codec->close(p->avctx);
653
release_delayed_buffers(p);
656
for (i = 0; i < thread_count; i++) {
657
PerThreadContext *p = &fctx->threads[i];
659
avcodec_default_free_buffers(p->avctx);
661
pthread_mutex_destroy(&p->mutex);
662
pthread_mutex_destroy(&p->progress_mutex);
663
pthread_cond_destroy(&p->input_cond);
664
pthread_cond_destroy(&p->progress_cond);
665
pthread_cond_destroy(&p->output_cond);
666
av_freep(&p->avpkt.data);
669
av_freep(&p->avctx->priv_data);
674
av_freep(&fctx->threads);
675
pthread_mutex_destroy(&fctx->buffer_mutex);
676
av_freep(&avctx->thread_opaque);
679
static int frame_thread_init(AVCodecContext *avctx)
681
int thread_count = avctx->thread_count;
682
AVCodec *codec = avctx->codec;
683
AVCodecContext *src = avctx;
684
FrameThreadContext *fctx;
687
avctx->thread_opaque = fctx = av_mallocz(sizeof(FrameThreadContext));
689
fctx->threads = av_mallocz(sizeof(PerThreadContext) * thread_count);
690
pthread_mutex_init(&fctx->buffer_mutex, NULL);
693
for (i = 0; i < thread_count; i++) {
694
AVCodecContext *copy = av_malloc(sizeof(AVCodecContext));
695
PerThreadContext *p = &fctx->threads[i];
697
pthread_mutex_init(&p->mutex, NULL);
698
pthread_mutex_init(&p->progress_mutex, NULL);
699
pthread_cond_init(&p->input_cond, NULL);
700
pthread_cond_init(&p->progress_cond, NULL);
701
pthread_cond_init(&p->output_cond, NULL);
707
copy->thread_opaque = p;
708
copy->pkt = &p->avpkt;
714
err = codec->init(copy);
716
update_context_from_thread(avctx, copy, 1);
719
copy->priv_data = av_malloc(codec->priv_data_size);
720
memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
722
if (codec->init_thread_copy)
723
err = codec->init_thread_copy(copy);
728
pthread_create(&p->thread, NULL, frame_worker_thread, p);
734
frame_thread_free(avctx, i+1);
739
void ff_thread_flush(AVCodecContext *avctx)
741
FrameThreadContext *fctx = avctx->thread_opaque;
743
if (!avctx->thread_opaque) return;
745
park_frame_worker_threads(fctx, avctx->thread_count);
747
if (fctx->prev_thread)
748
update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0);
750
fctx->next_decoding = fctx->next_finished = 0;
752
fctx->prev_thread = NULL;
755
static int *allocate_progress(PerThreadContext *p)
759
for (i = 0; i < MAX_BUFFERS; i++)
760
if (!p->progress_used[i]) break;
762
if (i == MAX_BUFFERS) {
763
av_log(p->avctx, AV_LOG_ERROR, "allocate_progress() overflow\n");
767
p->progress_used[i] = 1;
769
return p->progress[i];
772
int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f)
774
PerThreadContext *p = avctx->thread_opaque;
779
if (!(avctx->active_thread_type&FF_THREAD_FRAME)) {
780
f->thread_opaque = NULL;
781
return avctx->get_buffer(avctx, f);
784
if (p->state != STATE_SETTING_UP) {
785
av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
789
pthread_mutex_lock(&p->parent->buffer_mutex);
790
f->thread_opaque = progress = allocate_progress(p);
793
pthread_mutex_unlock(&p->parent->buffer_mutex);
800
if (avctx->thread_safe_callbacks ||
801
avctx->get_buffer == avcodec_default_get_buffer) {
802
err = avctx->get_buffer(avctx, f);
804
p->requested_frame = f;
805
p->state = STATE_GET_BUFFER;
806
pthread_mutex_lock(&p->progress_mutex);
807
pthread_cond_signal(&p->progress_cond);
809
while (p->state != STATE_SETTING_UP)
810
pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
814
pthread_mutex_unlock(&p->progress_mutex);
817
pthread_mutex_unlock(&p->parent->buffer_mutex);
820
* Buffer age is difficult to keep track of between
821
* multiple threads, and the optimizations it allows
822
* are not worth the effort. It is disabled for now.
829
void ff_thread_release_buffer(AVCodecContext *avctx, AVFrame *f)
831
PerThreadContext *p = avctx->thread_opaque;
833
if (!(avctx->active_thread_type&FF_THREAD_FRAME)) {
834
avctx->release_buffer(avctx, f);
838
if (p->num_released_buffers >= MAX_BUFFERS) {
839
av_log(p->avctx, AV_LOG_ERROR, "too many thread_release_buffer calls!\n");
843
if(avctx->debug & FF_DEBUG_BUFFERS)
844
av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p, %d buffers used\n",
845
f, f->owner->internal_buffer_count);
847
p->released_buffers[p->num_released_buffers++] = *f;
848
memset(f->data, 0, sizeof(f->data));
852
* Set the threading algorithms used.
854
* Threading requires more than one thread.
855
* Frame threading requires entire frames to be passed to the codec,
856
* and introduces extra decoding delay, so is incompatible with low_delay.
858
* @param avctx The context.
860
static void validate_thread_parameters(AVCodecContext *avctx)
862
int frame_threading_supported = (avctx->codec->capabilities & CODEC_CAP_FRAME_THREADS)
863
&& !(avctx->flags & CODEC_FLAG_TRUNCATED)
864
&& !(avctx->flags & CODEC_FLAG_LOW_DELAY)
865
&& !(avctx->flags2 & CODEC_FLAG2_CHUNKS);
866
if (avctx->thread_count == 1) {
867
avctx->active_thread_type = 0;
868
} else if (frame_threading_supported && (avctx->thread_type & FF_THREAD_FRAME)) {
869
avctx->active_thread_type = FF_THREAD_FRAME;
871
avctx->active_thread_type = FF_THREAD_SLICE;
875
int avcodec_thread_init(AVCodecContext *avctx, int thread_count)
877
if (avctx->thread_opaque) {
878
av_log(avctx, AV_LOG_ERROR, "avcodec_thread_init is ignored after avcodec_open\n");
882
avctx->thread_count = FFMAX(1, thread_count);
885
validate_thread_parameters(avctx);
887
if (avctx->active_thread_type&FF_THREAD_SLICE)
888
return thread_init(avctx);
889
else if (avctx->active_thread_type&FF_THREAD_FRAME)
890
return frame_thread_init(avctx);
896
void avcodec_thread_free(AVCodecContext *avctx)
898
if (avctx->active_thread_type&FF_THREAD_FRAME)
899
frame_thread_free(avctx, avctx->thread_count);