w32pthreads: always use Vista+ API, drop XP support
[libav.git] / libavcodec / pthread_frame.c
1 /*
2 * This file is part of Libav.
3 *
4 * Libav 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.
8 *
9 * Libav 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.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with Libav; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 /**
20 * @file
21 * Frame multithreading support functions
22 * @see doc/multithreading.txt
23 */
24
25 #include "config.h"
26
27 #include <stdatomic.h>
28 #include <stdint.h>
29
30 #if HAVE_PTHREADS
31 #include <pthread.h>
32 #elif HAVE_W32THREADS
33 #include "compat/w32pthreads.h"
34 #endif
35
36 #include "avcodec.h"
37 #include "hwaccel.h"
38 #include "internal.h"
39 #include "pthread_internal.h"
40 #include "thread.h"
41 #include "version.h"
42
43 #include "libavutil/avassert.h"
44 #include "libavutil/buffer.h"
45 #include "libavutil/common.h"
46 #include "libavutil/cpu.h"
47 #include "libavutil/frame.h"
48 #include "libavutil/internal.h"
49 #include "libavutil/log.h"
50 #include "libavutil/mem.h"
51
52 enum {
53 ///< Set when the thread is awaiting a packet.
54 STATE_INPUT_READY,
55 ///< Set before the codec has called ff_thread_finish_setup().
56 STATE_SETTING_UP,
57 /**
58 * Set when the codec calls get_buffer().
59 * State is returned to STATE_SETTING_UP afterwards.
60 */
61 STATE_GET_BUFFER,
62 ///< Set after the codec has called ff_thread_finish_setup().
63 STATE_SETUP_FINISHED,
64 };
65
66 /**
67 * Context used by codec threads and stored in their AVCodecInternal thread_ctx.
68 */
69 typedef struct PerThreadContext {
70 struct FrameThreadContext *parent;
71
72 pthread_t thread;
73 int thread_init;
74 pthread_cond_t input_cond; ///< Used to wait for a new packet from the main thread.
75 pthread_cond_t progress_cond; ///< Used by child threads to wait for progress to change.
76 pthread_cond_t output_cond; ///< Used by the main thread to wait for frames to finish.
77
78 pthread_mutex_t mutex; ///< Mutex used to protect the contents of the PerThreadContext.
79 pthread_mutex_t progress_mutex; ///< Mutex used to protect frame progress values and progress_cond.
80
81 AVCodecContext *avctx; ///< Context used to decode packets passed to this thread.
82
83 AVPacket avpkt; ///< Input packet (for decoding) or output (for encoding).
84
85 AVFrame *frame; ///< Output frame (for decoding) or input (for encoding).
86 int got_frame; ///< The output of got_picture_ptr from the last avcodec_decode_video() call.
87 int result; ///< The result of the last codec decode/encode() call.
88
89 atomic_int state;
90
91 /**
92 * Array of frames passed to ff_thread_release_buffer().
93 * Frames are released after all threads referencing them are finished.
94 */
95 AVFrame *released_buffers;
96 int num_released_buffers;
97 int released_buffers_allocated;
98
99 AVFrame *requested_frame; ///< AVFrame the codec passed to get_buffer()
100 int requested_flags; ///< flags passed to get_buffer() for requested_frame
101
102 int die; ///< Set when the thread should exit.
103
104 int hwaccel_serializing;
105 int async_serializing;
106 } PerThreadContext;
107
108 /**
109 * Context stored in the client AVCodecInternal thread_ctx.
110 */
111 typedef struct FrameThreadContext {
112 PerThreadContext *threads; ///< The contexts for each thread.
113 PerThreadContext *prev_thread; ///< The last thread submit_packet() was called on.
114
115 pthread_mutex_t buffer_mutex; ///< Mutex used to protect get/release_buffer().
116 /**
117 * This lock is used for ensuring threads run in serial when hwaccel
118 * is used.
119 */
120 pthread_mutex_t hwaccel_mutex;
121 pthread_mutex_t async_mutex;
122
123 int next_decoding; ///< The next context to submit a packet to.
124 int next_finished; ///< The next context to return output from.
125
126 int delaying; /**<
127 * Set for the first N packets, where N is the number of threads.
128 * While it is set, ff_thread_en/decode_frame won't return any results.
129 */
130 } FrameThreadContext;
131
132 /**
133 * Codec worker thread.
134 *
135 * Automatically calls ff_thread_finish_setup() if the codec does
136 * not provide an update_thread_context method, or if the codec returns
137 * before calling it.
138 */
139 static attribute_align_arg void *frame_worker_thread(void *arg)
140 {
141 PerThreadContext *p = arg;
142 AVCodecContext *avctx = p->avctx;
143 const AVCodec *codec = avctx->codec;
144
145 while (1) {
146 if (atomic_load(&p->state) == STATE_INPUT_READY) {
147 pthread_mutex_lock(&p->mutex);
148 while (atomic_load(&p->state) == STATE_INPUT_READY) {
149 if (p->die) {
150 pthread_mutex_unlock(&p->mutex);
151 goto die;
152 }
153 pthread_cond_wait(&p->input_cond, &p->mutex);
154 }
155 pthread_mutex_unlock(&p->mutex);
156 }
157
158 if (!codec->update_thread_context && avctx->thread_safe_callbacks)
159 ff_thread_finish_setup(avctx);
160
161 pthread_mutex_lock(&p->mutex);
162
163 /* If a decoder supports hwaccel, then it must call ff_get_format().
164 * Since that call must happen before ff_thread_finish_setup(), the
165 * decoder is required to implement update_thread_context() and call
166 * ff_thread_finish_setup() manually. Therefore the above
167 * ff_thread_finish_setup() call did not happen and hwaccel_serializing
168 * cannot be true here. */
169 av_assert0(!p->hwaccel_serializing);
170
171 /* if the previous thread uses hwaccel then we take the lock to ensure
172 * the threads don't run concurrently */
173 if (avctx->hwaccel) {
174 pthread_mutex_lock(&p->parent->hwaccel_mutex);
175 p->hwaccel_serializing = 1;
176 }
177
178 av_frame_unref(p->frame);
179 p->got_frame = 0;
180 p->result = codec->decode(avctx, p->frame, &p->got_frame, &p->avpkt);
181
182 if ((p->result < 0 || !p->got_frame) && p->frame->buf[0]) {
183 if (avctx->internal->allocate_progress)
184 av_log(avctx, AV_LOG_ERROR, "A frame threaded decoder did not "
185 "free the frame on failure. This is a bug, please report it.\n");
186 av_frame_unref(p->frame);
187 }
188
189 if (atomic_load(&p->state) == STATE_SETTING_UP)
190 ff_thread_finish_setup(avctx);
191
192 if (p->hwaccel_serializing) {
193 p->hwaccel_serializing = 0;
194 pthread_mutex_unlock(&p->parent->hwaccel_mutex);
195 }
196
197 if (p->async_serializing) {
198 p->async_serializing = 0;
199 pthread_mutex_unlock(&p->parent->async_mutex);
200 }
201
202 atomic_store(&p->state, STATE_INPUT_READY);
203
204 pthread_mutex_lock(&p->progress_mutex);
205 pthread_cond_signal(&p->output_cond);
206 pthread_mutex_unlock(&p->progress_mutex);
207
208 pthread_mutex_unlock(&p->mutex);
209 }
210 die:
211
212 return NULL;
213 }
214
215 /**
216 * Update the next thread's AVCodecContext with values from the reference thread's context.
217 *
218 * @param dst The destination context.
219 * @param src The source context.
220 * @param for_user 0 if the destination is a codec thread, 1 if the destination is the user's thread
221 */
222 static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src, int for_user)
223 {
224 int err = 0;
225
226 if (dst != src) {
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;
232 dst->sw_pix_fmt = src->sw_pix_fmt;
233
234 dst->coded_width = src->coded_width;
235 dst->coded_height = src->coded_height;
236
237 dst->has_b_frames = src->has_b_frames;
238 dst->idct_algo = src->idct_algo;
239
240 dst->bits_per_coded_sample = src->bits_per_coded_sample;
241 dst->sample_aspect_ratio = src->sample_aspect_ratio;
242
243 dst->profile = src->profile;
244 dst->level = src->level;
245
246 dst->bits_per_raw_sample = src->bits_per_raw_sample;
247 dst->ticks_per_frame = src->ticks_per_frame;
248 dst->color_primaries = src->color_primaries;
249
250 dst->color_trc = src->color_trc;
251 dst->colorspace = src->colorspace;
252 dst->color_range = src->color_range;
253 dst->chroma_sample_location = src->chroma_sample_location;
254
255 dst->hwaccel = src->hwaccel;
256 dst->hwaccel_context = src->hwaccel_context;
257 dst->internal->hwaccel_priv_data = src->internal->hwaccel_priv_data;
258
259 if (!!dst->hw_frames_ctx != !!src->hw_frames_ctx ||
260 (dst->hw_frames_ctx && dst->hw_frames_ctx->data != src->hw_frames_ctx->data)) {
261 av_buffer_unref(&dst->hw_frames_ctx);
262
263 if (src->hw_frames_ctx) {
264 dst->hw_frames_ctx = av_buffer_ref(src->hw_frames_ctx);
265 if (!dst->hw_frames_ctx)
266 return AVERROR(ENOMEM);
267 }
268 }
269
270 dst->hwaccel_flags = src->hwaccel_flags;
271 }
272
273 if (for_user) {
274 #if FF_API_CODED_FRAME
275 FF_DISABLE_DEPRECATION_WARNINGS
276 dst->coded_frame = src->coded_frame;
277 FF_ENABLE_DEPRECATION_WARNINGS
278 #endif
279 } else {
280 if (dst->codec->update_thread_context)
281 err = dst->codec->update_thread_context(dst, src);
282 }
283
284 return err;
285 }
286
287 /**
288 * Update the next thread's AVCodecContext with values set by the user.
289 *
290 * @param dst The destination context.
291 * @param src The source context.
292 * @return 0 on success, negative error code on failure
293 */
294 static int update_context_from_user(AVCodecContext *dst, AVCodecContext *src)
295 {
296 #define copy_fields(s, e) memcpy(&dst->s, &src->s, (char*)&dst->e - (char*)&dst->s);
297 dst->flags = src->flags;
298
299 dst->draw_horiz_band= src->draw_horiz_band;
300 dst->get_buffer2 = src->get_buffer2;
301
302 dst->opaque = src->opaque;
303 dst->debug = src->debug;
304
305 dst->slice_flags = src->slice_flags;
306 dst->flags2 = src->flags2;
307
308 copy_fields(skip_loop_filter, subtitle_header);
309
310 dst->frame_number = src->frame_number;
311 dst->reordered_opaque = src->reordered_opaque;
312
313 if (src->slice_count && src->slice_offset) {
314 if (dst->slice_count < src->slice_count) {
315 int *tmp = av_realloc(dst->slice_offset, src->slice_count *
316 sizeof(*dst->slice_offset));
317 if (!tmp) {
318 av_free(dst->slice_offset);
319 return AVERROR(ENOMEM);
320 }
321 dst->slice_offset = tmp;
322 }
323 memcpy(dst->slice_offset, src->slice_offset,
324 src->slice_count * sizeof(*dst->slice_offset));
325 }
326 dst->slice_count = src->slice_count;
327 return 0;
328 #undef copy_fields
329 }
330
331 /// Releases the buffers that this decoding thread was the last user of.
332 static void release_delayed_buffers(PerThreadContext *p)
333 {
334 FrameThreadContext *fctx = p->parent;
335
336 while (p->num_released_buffers > 0) {
337 AVFrame *f;
338
339 pthread_mutex_lock(&fctx->buffer_mutex);
340
341 // fix extended data in case the caller screwed it up
342 av_assert0(p->avctx->codec_type == AVMEDIA_TYPE_VIDEO);
343 f = &p->released_buffers[--p->num_released_buffers];
344 f->extended_data = f->data;
345 av_frame_unref(f);
346
347 pthread_mutex_unlock(&fctx->buffer_mutex);
348 }
349 }
350
351 static int submit_packet(PerThreadContext *p, AVPacket *avpkt)
352 {
353 FrameThreadContext *fctx = p->parent;
354 PerThreadContext *prev_thread = fctx->prev_thread;
355 const AVCodec *codec = p->avctx->codec;
356
357 if (!avpkt->size && !(codec->capabilities & AV_CODEC_CAP_DELAY))
358 return 0;
359
360 pthread_mutex_lock(&p->mutex);
361
362 release_delayed_buffers(p);
363
364 if (prev_thread) {
365 int err;
366 if (atomic_load(&prev_thread->state) == STATE_SETTING_UP) {
367 pthread_mutex_lock(&prev_thread->progress_mutex);
368 while (atomic_load(&prev_thread->state) == STATE_SETTING_UP)
369 pthread_cond_wait(&prev_thread->progress_cond, &prev_thread->progress_mutex);
370 pthread_mutex_unlock(&prev_thread->progress_mutex);
371 }
372
373 err = update_context_from_thread(p->avctx, prev_thread->avctx, 0);
374 if (err) {
375 pthread_mutex_unlock(&p->mutex);
376 return err;
377 }
378 }
379
380 av_packet_unref(&p->avpkt);
381 av_packet_ref(&p->avpkt, avpkt);
382
383 atomic_store(&p->state, STATE_SETTING_UP);
384 pthread_cond_signal(&p->input_cond);
385 pthread_mutex_unlock(&p->mutex);
386
387 /*
388 * If the client doesn't have a thread-safe get_buffer(),
389 * then decoding threads call back to the main thread,
390 * and it calls back to the client here.
391 */
392
393 if (!p->avctx->thread_safe_callbacks &&
394 p->avctx->get_buffer2 != avcodec_default_get_buffer2) {
395 while (atomic_load(&p->state) != STATE_SETUP_FINISHED &&
396 atomic_load(&p->state) != STATE_INPUT_READY) {
397 pthread_mutex_lock(&p->progress_mutex);
398 while (atomic_load(&p->state) == STATE_SETTING_UP)
399 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
400
401 if (atomic_load_explicit(&p->state, memory_order_acquire) == STATE_GET_BUFFER) {
402 p->result = ff_get_buffer(p->avctx, p->requested_frame, p->requested_flags);
403 atomic_store(&p->state, STATE_SETTING_UP);
404 pthread_cond_signal(&p->progress_cond);
405 }
406 pthread_mutex_unlock(&p->progress_mutex);
407 }
408 }
409
410 fctx->prev_thread = p;
411 fctx->next_decoding++;
412
413 return 0;
414 }
415
416 int ff_thread_decode_frame(AVCodecContext *avctx,
417 AVFrame *picture, int *got_picture_ptr,
418 AVPacket *avpkt)
419 {
420 FrameThreadContext *fctx = avctx->internal->thread_ctx;
421 int finished = fctx->next_finished;
422 PerThreadContext *p;
423 int err, ret;
424
425 /* release the async lock, permitting blocked hwaccel threads to
426 * go forward while we are in this function */
427 pthread_mutex_unlock(&fctx->async_mutex);
428
429 /*
430 * Submit a packet to the next decoding thread.
431 */
432
433 p = &fctx->threads[fctx->next_decoding];
434 err = update_context_from_user(p->avctx, avctx);
435 if (err)
436 goto finish;
437 err = submit_packet(p, avpkt);
438 if (err)
439 goto finish;
440
441 /*
442 * If we're still receiving the initial packets, don't return a frame.
443 */
444
445 if (fctx->delaying) {
446 if (fctx->next_decoding >= (avctx->thread_count-1)) fctx->delaying = 0;
447
448 *got_picture_ptr=0;
449 if (avpkt->size) {
450 ret = avpkt->size;
451 goto finish;
452 }
453 }
454
455 /*
456 * Return the next available frame from the oldest thread.
457 * If we're at the end of the stream, then we have to skip threads that
458 * didn't output a frame, because we don't want to accidentally signal
459 * EOF (avpkt->size == 0 && *got_picture_ptr == 0).
460 */
461
462 do {
463 p = &fctx->threads[finished++];
464
465 if (atomic_load(&p->state) != STATE_INPUT_READY) {
466 pthread_mutex_lock(&p->progress_mutex);
467 while (atomic_load_explicit(&p->state, memory_order_relaxed) != STATE_INPUT_READY)
468 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
469 pthread_mutex_unlock(&p->progress_mutex);
470 }
471
472 av_frame_move_ref(picture, p->frame);
473 *got_picture_ptr = p->got_frame;
474 picture->pkt_dts = p->avpkt.dts;
475
476 /*
477 * A later call with avkpt->size == 0 may loop over all threads,
478 * including this one, searching for a frame to return before being
479 * stopped by the "finished != fctx->next_finished" condition.
480 * Make sure we don't mistakenly return the same frame again.
481 */
482 p->got_frame = 0;
483
484 if (finished >= avctx->thread_count) finished = 0;
485 } while (!avpkt->size && !*got_picture_ptr && finished != fctx->next_finished);
486
487 update_context_from_thread(avctx, p->avctx, 1);
488
489 if (fctx->next_decoding >= avctx->thread_count) fctx->next_decoding = 0;
490
491 fctx->next_finished = finished;
492
493 /* return the size of the consumed packet if no error occurred */
494 ret = (p->result >= 0) ? avpkt->size : p->result;
495 finish:
496 pthread_mutex_lock(&fctx->async_mutex);
497 if (err < 0)
498 return err;
499 return ret;
500 }
501
502 void ff_thread_report_progress(ThreadFrame *f, int n, int field)
503 {
504 PerThreadContext *p;
505 atomic_int *progress = f->progress ? (atomic_int*)f->progress->data : NULL;
506
507 if (!progress ||
508 atomic_load_explicit(&progress[field], memory_order_relaxed) >= n)
509 return;
510
511 p = f->owner->internal->thread_ctx;
512
513 if (f->owner->debug&FF_DEBUG_THREADS)
514 av_log(f->owner, AV_LOG_DEBUG, "%p finished %d field %d\n", progress, n, field);
515
516 pthread_mutex_lock(&p->progress_mutex);
517
518 atomic_store_explicit(&progress[field], n, memory_order_release);
519
520 pthread_cond_broadcast(&p->progress_cond);
521 pthread_mutex_unlock(&p->progress_mutex);
522 }
523
524 void ff_thread_await_progress(ThreadFrame *f, int n, int field)
525 {
526 PerThreadContext *p;
527 atomic_int *progress = f->progress ? (atomic_int*)f->progress->data : NULL;
528
529 if (!progress ||
530 atomic_load_explicit(&progress[field], memory_order_acquire) >= n)
531 return;
532
533 p = f->owner->internal->thread_ctx;
534
535 if (f->owner->debug&FF_DEBUG_THREADS)
536 av_log(f->owner, AV_LOG_DEBUG, "thread awaiting %d field %d from %p\n", n, field, progress);
537
538 pthread_mutex_lock(&p->progress_mutex);
539 while (atomic_load_explicit(&progress[field], memory_order_relaxed) < n)
540 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
541 pthread_mutex_unlock(&p->progress_mutex);
542 }
543
544 void ff_thread_finish_setup(AVCodecContext *avctx) {
545 PerThreadContext *p = avctx->internal->thread_ctx;
546
547 if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
548
549 if (avctx->hwaccel && !p->hwaccel_serializing) {
550 pthread_mutex_lock(&p->parent->hwaccel_mutex);
551 p->hwaccel_serializing = 1;
552 }
553
554 /* this assumes that no hwaccel calls happen before ff_thread_finish_setup() */
555 if (avctx->hwaccel &&
556 !(avctx->hwaccel->caps_internal & HWACCEL_CAP_ASYNC_SAFE)) {
557 p->async_serializing = 1;
558 pthread_mutex_lock(&p->parent->async_mutex);
559 }
560
561 pthread_mutex_lock(&p->progress_mutex);
562
563 atomic_store(&p->state, STATE_SETUP_FINISHED);
564
565 pthread_cond_broadcast(&p->progress_cond);
566 pthread_mutex_unlock(&p->progress_mutex);
567 }
568
569 /// Waits for all threads to finish.
570 static void park_frame_worker_threads(FrameThreadContext *fctx, int thread_count)
571 {
572 int i;
573
574 pthread_mutex_unlock(&fctx->async_mutex);
575
576 for (i = 0; i < thread_count; i++) {
577 PerThreadContext *p = &fctx->threads[i];
578
579 if (atomic_load(&p->state) != STATE_INPUT_READY) {
580 pthread_mutex_lock(&p->progress_mutex);
581 while (atomic_load(&p->state) != STATE_INPUT_READY)
582 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
583 pthread_mutex_unlock(&p->progress_mutex);
584 }
585 }
586
587 pthread_mutex_lock(&fctx->async_mutex);
588 }
589
590 void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
591 {
592 FrameThreadContext *fctx = avctx->internal->thread_ctx;
593 const AVCodec *codec = avctx->codec;
594 int i;
595
596 park_frame_worker_threads(fctx, thread_count);
597
598 if (fctx->prev_thread && fctx->prev_thread != fctx->threads)
599 update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0);
600
601 for (i = 0; i < thread_count; i++) {
602 PerThreadContext *p = &fctx->threads[i];
603
604 pthread_mutex_lock(&p->mutex);
605 p->die = 1;
606 pthread_cond_signal(&p->input_cond);
607 pthread_mutex_unlock(&p->mutex);
608
609 if (p->thread_init)
610 pthread_join(p->thread, NULL);
611
612 if (codec->close)
613 codec->close(p->avctx);
614
615 avctx->codec = NULL;
616
617 release_delayed_buffers(p);
618 av_frame_free(&p->frame);
619 }
620
621 for (i = 0; i < thread_count; i++) {
622 PerThreadContext *p = &fctx->threads[i];
623
624 pthread_mutex_destroy(&p->mutex);
625 pthread_mutex_destroy(&p->progress_mutex);
626 pthread_cond_destroy(&p->input_cond);
627 pthread_cond_destroy(&p->progress_cond);
628 pthread_cond_destroy(&p->output_cond);
629 av_packet_unref(&p->avpkt);
630 av_freep(&p->released_buffers);
631
632 if (i) {
633 av_freep(&p->avctx->priv_data);
634 av_freep(&p->avctx->slice_offset);
635 }
636
637 av_buffer_unref(&p->avctx->hw_frames_ctx);
638
639 av_freep(&p->avctx->internal);
640 av_freep(&p->avctx);
641 }
642
643 av_freep(&fctx->threads);
644 pthread_mutex_destroy(&fctx->buffer_mutex);
645 pthread_mutex_destroy(&fctx->hwaccel_mutex);
646
647 pthread_mutex_unlock(&fctx->async_mutex);
648 pthread_mutex_destroy(&fctx->async_mutex);
649
650 av_freep(&avctx->internal->thread_ctx);
651 }
652
653 int ff_frame_thread_init(AVCodecContext *avctx)
654 {
655 int thread_count = avctx->thread_count;
656 const AVCodec *codec = avctx->codec;
657 AVCodecContext *src = avctx;
658 FrameThreadContext *fctx;
659 int i, err = 0;
660
661 if (!thread_count) {
662 int nb_cpus = av_cpu_count();
663 av_log(avctx, AV_LOG_DEBUG, "detected %d logical cores\n", nb_cpus);
664 // use number of cores + 1 as thread count if there is more than one
665 if (nb_cpus > 1)
666 thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
667 else
668 thread_count = avctx->thread_count = 1;
669 }
670
671 if (thread_count <= 1) {
672 avctx->active_thread_type = 0;
673 return 0;
674 }
675
676 avctx->internal->thread_ctx = fctx = av_mallocz(sizeof(FrameThreadContext));
677 if (!fctx)
678 return AVERROR(ENOMEM);
679
680 fctx->threads = av_mallocz(sizeof(PerThreadContext) * thread_count);
681 if (!fctx->threads) {
682 av_freep(&avctx->internal->thread_ctx);
683 return AVERROR(ENOMEM);
684 }
685
686 pthread_mutex_init(&fctx->buffer_mutex, NULL);
687 pthread_mutex_init(&fctx->hwaccel_mutex, NULL);
688
689 pthread_mutex_init(&fctx->async_mutex, NULL);
690 pthread_mutex_lock(&fctx->async_mutex);
691
692 fctx->delaying = 1;
693
694 for (i = 0; i < thread_count; i++) {
695 AVCodecContext *copy = av_malloc(sizeof(AVCodecContext));
696 PerThreadContext *p = &fctx->threads[i];
697
698 pthread_mutex_init(&p->mutex, NULL);
699 pthread_mutex_init(&p->progress_mutex, NULL);
700 pthread_cond_init(&p->input_cond, NULL);
701 pthread_cond_init(&p->progress_cond, NULL);
702 pthread_cond_init(&p->output_cond, NULL);
703
704 p->frame = av_frame_alloc();
705 if (!p->frame) {
706 av_freep(&copy);
707 err = AVERROR(ENOMEM);
708 goto error;
709 }
710
711 p->parent = fctx;
712 p->avctx = copy;
713
714 if (!copy) {
715 err = AVERROR(ENOMEM);
716 goto error;
717 }
718
719 *copy = *src;
720
721 copy->internal = av_malloc(sizeof(AVCodecInternal));
722 if (!copy->internal) {
723 err = AVERROR(ENOMEM);
724 goto error;
725 }
726 *copy->internal = *src->internal;
727 copy->internal->thread_ctx = p;
728 copy->internal->last_pkt_props = &p->avpkt;
729
730 if (!i) {
731 src = copy;
732
733 if (codec->init)
734 err = codec->init(copy);
735
736 update_context_from_thread(avctx, copy, 1);
737 } else {
738 copy->priv_data = av_malloc(codec->priv_data_size);
739 if (!copy->priv_data) {
740 err = AVERROR(ENOMEM);
741 goto error;
742 }
743 memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
744 copy->internal->is_copy = 1;
745
746 if (codec->init_thread_copy)
747 err = codec->init_thread_copy(copy);
748 }
749
750 if (err) goto error;
751
752 if (!pthread_create(&p->thread, NULL, frame_worker_thread, p))
753 p->thread_init = 1;
754 }
755
756 return 0;
757
758 error:
759 ff_frame_thread_free(avctx, i+1);
760
761 return err;
762 }
763
764 void ff_thread_flush(AVCodecContext *avctx)
765 {
766 int i;
767 FrameThreadContext *fctx = avctx->internal->thread_ctx;
768
769 if (!fctx) return;
770
771 park_frame_worker_threads(fctx, avctx->thread_count);
772 if (fctx->prev_thread) {
773 if (fctx->prev_thread != &fctx->threads[0])
774 update_context_from_thread(fctx->threads[0].avctx, fctx->prev_thread->avctx, 0);
775 }
776
777 fctx->next_decoding = fctx->next_finished = 0;
778 fctx->delaying = 1;
779 fctx->prev_thread = NULL;
780 for (i = 0; i < avctx->thread_count; i++) {
781 PerThreadContext *p = &fctx->threads[i];
782 // Make sure decode flush calls with size=0 won't return old frames
783 p->got_frame = 0;
784 av_frame_unref(p->frame);
785
786 release_delayed_buffers(p);
787
788 if (avctx->codec->flush)
789 avctx->codec->flush(p->avctx);
790 }
791 }
792
793 int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
794 {
795 PerThreadContext *p = avctx->internal->thread_ctx;
796 int err;
797
798 f->owner = avctx;
799
800 if (!(avctx->active_thread_type & FF_THREAD_FRAME))
801 return ff_get_buffer(avctx, f->f, flags);
802
803 if (atomic_load(&p->state) != STATE_SETTING_UP &&
804 (avctx->codec->update_thread_context || !avctx->thread_safe_callbacks)) {
805 av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
806 return -1;
807 }
808
809 if (avctx->internal->allocate_progress) {
810 atomic_int *progress;
811 f->progress = av_buffer_alloc(2 * sizeof(*progress));
812 if (!f->progress) {
813 return AVERROR(ENOMEM);
814 }
815 progress = (atomic_int*)f->progress->data;
816
817 atomic_init(&progress[0], -1);
818 atomic_init(&progress[1], -1);
819 }
820
821 pthread_mutex_lock(&p->parent->buffer_mutex);
822 if (avctx->thread_safe_callbacks ||
823 avctx->get_buffer2 == avcodec_default_get_buffer2) {
824 err = ff_get_buffer(avctx, f->f, flags);
825 } else {
826 p->requested_frame = f->f;
827 p->requested_flags = flags;
828 atomic_store_explicit(&p->state, STATE_GET_BUFFER, memory_order_release);
829 pthread_mutex_lock(&p->progress_mutex);
830 pthread_cond_signal(&p->progress_cond);
831
832 while (atomic_load(&p->state) != STATE_SETTING_UP)
833 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
834
835 err = p->result;
836
837 pthread_mutex_unlock(&p->progress_mutex);
838
839 }
840 if (!avctx->thread_safe_callbacks && !avctx->codec->update_thread_context)
841 ff_thread_finish_setup(avctx);
842
843 if (err)
844 av_buffer_unref(&f->progress);
845
846 pthread_mutex_unlock(&p->parent->buffer_mutex);
847
848 return err;
849 }
850
851 void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
852 {
853 PerThreadContext *p = avctx->internal->thread_ctx;
854 FrameThreadContext *fctx;
855 AVFrame *dst, *tmp;
856 int can_direct_free = !(avctx->active_thread_type & FF_THREAD_FRAME) ||
857 avctx->thread_safe_callbacks ||
858 avctx->get_buffer2 == avcodec_default_get_buffer2;
859
860 if (!f->f || !f->f->buf[0])
861 return;
862
863 if (avctx->debug & FF_DEBUG_BUFFERS)
864 av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p\n", f);
865
866 av_buffer_unref(&f->progress);
867 f->owner = NULL;
868
869 if (can_direct_free) {
870 av_frame_unref(f->f);
871 return;
872 }
873
874 fctx = p->parent;
875 pthread_mutex_lock(&fctx->buffer_mutex);
876
877 if (p->num_released_buffers + 1 >= INT_MAX / sizeof(*p->released_buffers))
878 goto fail;
879 tmp = av_fast_realloc(p->released_buffers, &p->released_buffers_allocated,
880 (p->num_released_buffers + 1) *
881 sizeof(*p->released_buffers));
882 if (!tmp)
883 goto fail;
884 p->released_buffers = tmp;
885
886 dst = &p->released_buffers[p->num_released_buffers];
887 av_frame_move_ref(dst, f->f);
888
889 p->num_released_buffers++;
890
891 fail:
892 pthread_mutex_unlock(&fctx->buffer_mutex);
893 }