1 /*
2 * This file is part of FFmpeg.
3 *
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.
8 *
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.
13 *
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
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 #include "avcodec.h"
31 #include "hwaccel.h"
32 #include "internal.h"
33 #include "pthread_internal.h"
34 #include "thread.h"
35 #include "version.h"
36
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"
47
48 enum {
49 ///< Set when the thread is awaiting a packet.
50 STATE_INPUT_READY,
51 ///< Set before the codec has called ff_thread_finish_setup().
52 STATE_SETTING_UP,
53 /**
54 * Set when the codec calls get_buffer().
55 * State is returned to STATE_SETTING_UP afterwards.
56 */
57 STATE_GET_BUFFER,
58 /**
59 * Set when the codec calls get_format().
60 * State is returned to STATE_SETTING_UP afterwards.
61 */
62 STATE_GET_FORMAT,
63 ///< Set after the codec has called ff_thread_finish_setup().
64 STATE_SETUP_FINISHED,
65 };
66
67 /**
68 * Context used by codec threads and stored in their AVCodecInternal thread_ctx.
69 */
70 typedef struct PerThreadContext {
71 struct FrameThreadContext *parent;
72
73 pthread_t thread;
74 int thread_init;
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.
78
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.
81
82 AVCodecContext *avctx; ///< Context used to decode packets passed to this thread.
83
84 AVPacket avpkt; ///< Input packet (for decoding) or output (for encoding).
85
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.
89
90 atomic_int state;
91
92 /**
93 * Array of frames passed to ff_thread_release_buffer().
94 * Frames are released after all threads referencing them are finished.
95 */
96 AVFrame *released_buffers;
97 int num_released_buffers;
98 int released_buffers_allocated;
99
100 AVFrame *requested_frame; ///< AVFrame the codec passed to get_buffer()
101 int requested_flags; ///< flags passed to get_buffer() for requested_frame
102
103 const enum AVPixelFormat *available_formats; ///< Format array for get_format()
104 enum AVPixelFormat result_format; ///< get_format() result
105
106 int die; ///< Set when the thread should exit.
107
108 int hwaccel_serializing;
109 int async_serializing;
110
111 atomic_int debug_threads; ///< Set if the FF_DEBUG_THREADS option is set.
112 } PerThreadContext;
113
114 /**
115 * Context stored in the client AVCodecInternal thread_ctx.
116 */
117 typedef struct FrameThreadContext {
118 PerThreadContext *threads; ///< The contexts for each thread.
119 PerThreadContext *prev_thread; ///< The last thread submit_packet() was called on.
120
121 pthread_mutex_t buffer_mutex; ///< Mutex used to protect get/release_buffer().
122 /**
123 * This lock is used for ensuring threads run in serial when hwaccel
124 * is used.
125 */
126 pthread_mutex_t hwaccel_mutex;
127 pthread_mutex_t async_mutex;
128 pthread_cond_t async_cond;
129 int async_lock;
130
131 int next_decoding; ///< The next context to submit a packet to.
132 int next_finished; ///< The next context to return output from.
133
134 int delaying; /**<
135 * Set for the first N packets, where N is the number of threads.
136 * While it is set, ff_thread_en/decode_frame won't return any results.
137 */
138 } FrameThreadContext;
139
140 #define THREAD_SAFE_CALLBACKS(avctx) \
141 ((avctx)->thread_safe_callbacks || (avctx)->get_buffer2 == avcodec_default_get_buffer2)
142
async_lock(FrameThreadContext * fctx)143 static void async_lock(FrameThreadContext *fctx)
144 {
145 pthread_mutex_lock(&fctx->async_mutex);
146 while (fctx->async_lock)
147 pthread_cond_wait(&fctx->async_cond, &fctx->async_mutex);
148 fctx->async_lock = 1;
149 pthread_mutex_unlock(&fctx->async_mutex);
150 }
151
async_unlock(FrameThreadContext * fctx)152 static void async_unlock(FrameThreadContext *fctx)
153 {
154 pthread_mutex_lock(&fctx->async_mutex);
155 av_assert0(fctx->async_lock);
156 fctx->async_lock = 0;
157 pthread_cond_broadcast(&fctx->async_cond);
158 pthread_mutex_unlock(&fctx->async_mutex);
159 }
160
161 /**
162 * Codec worker thread.
163 *
164 * Automatically calls ff_thread_finish_setup() if the codec does
165 * not provide an update_thread_context method, or if the codec returns
166 * before calling it.
167 */
frame_worker_thread(void * arg)168 static attribute_align_arg void *frame_worker_thread(void *arg)
169 {
170 PerThreadContext *p = arg;
171 AVCodecContext *avctx = p->avctx;
172 const AVCodec *codec = avctx->codec;
173
174 pthread_mutex_lock(&p->mutex);
175 while (1) {
176 while (atomic_load(&p->state) == STATE_INPUT_READY && !p->die)
177 pthread_cond_wait(&p->input_cond, &p->mutex);
178
179 if (p->die) break;
180
181 if (!codec->update_thread_context && THREAD_SAFE_CALLBACKS(avctx))
182 ff_thread_finish_setup(avctx);
183
184 /* If a decoder supports hwaccel, then it must call ff_get_format().
185 * Since that call must happen before ff_thread_finish_setup(), the
186 * decoder is required to implement update_thread_context() and call
187 * ff_thread_finish_setup() manually. Therefore the above
188 * ff_thread_finish_setup() call did not happen and hwaccel_serializing
189 * cannot be true here. */
190 av_assert0(!p->hwaccel_serializing);
191
192 /* if the previous thread uses hwaccel then we take the lock to ensure
193 * the threads don't run concurrently */
194 if (avctx->hwaccel) {
195 pthread_mutex_lock(&p->parent->hwaccel_mutex);
196 p->hwaccel_serializing = 1;
197 }
198
199 av_frame_unref(p->frame);
200 p->got_frame = 0;
201 p->result = codec->decode(avctx, p->frame, &p->got_frame, &p->avpkt);
202
203 if ((p->result < 0 || !p->got_frame) && p->frame->buf[0]) {
204 if (avctx->internal->allocate_progress)
205 av_log(avctx, AV_LOG_ERROR, "A frame threaded decoder did not "
206 "free the frame on failure. This is a bug, please report it.\n");
207 av_frame_unref(p->frame);
208 }
209
210 if (atomic_load(&p->state) == STATE_SETTING_UP)
211 ff_thread_finish_setup(avctx);
212
213 if (p->hwaccel_serializing) {
214 p->hwaccel_serializing = 0;
215 pthread_mutex_unlock(&p->parent->hwaccel_mutex);
216 }
217
218 if (p->async_serializing) {
219 p->async_serializing = 0;
220
221 async_unlock(p->parent);
222 }
223
224 pthread_mutex_lock(&p->progress_mutex);
225
226 atomic_store(&p->state, STATE_INPUT_READY);
227
228 pthread_cond_broadcast(&p->progress_cond);
229 pthread_cond_signal(&p->output_cond);
230 pthread_mutex_unlock(&p->progress_mutex);
231 }
232 pthread_mutex_unlock(&p->mutex);
233
234 return NULL;
235 }
236
237 /**
238 * Update the next thread's AVCodecContext with values from the reference thread's context.
239 *
240 * @param dst The destination context.
241 * @param src The source context.
242 * @param for_user 0 if the destination is a codec thread, 1 if the destination is the user's thread
243 * @return 0 on success, negative error code on failure
244 */
update_context_from_thread(AVCodecContext * dst,AVCodecContext * src,int for_user)245 static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src, int for_user)
246 {
247 int err = 0;
248
249 if (dst != src && (for_user || !(src->codec_descriptor->props & AV_CODEC_PROP_INTRA_ONLY))) {
250 dst->time_base = src->time_base;
251 dst->framerate = src->framerate;
252 dst->width = src->width;
253 dst->height = src->height;
254 dst->pix_fmt = src->pix_fmt;
255 dst->sw_pix_fmt = src->sw_pix_fmt;
256
257 dst->coded_width = src->coded_width;
258 dst->coded_height = src->coded_height;
259
260 dst->has_b_frames = src->has_b_frames;
261 dst->idct_algo = src->idct_algo;
262
263 dst->bits_per_coded_sample = src->bits_per_coded_sample;
264 dst->sample_aspect_ratio = src->sample_aspect_ratio;
265
266 dst->profile = src->profile;
267 dst->level = src->level;
268
269 dst->bits_per_raw_sample = src->bits_per_raw_sample;
270 dst->ticks_per_frame = src->ticks_per_frame;
271 dst->color_primaries = src->color_primaries;
272
273 dst->color_trc = src->color_trc;
274 dst->colorspace = src->colorspace;
275 dst->color_range = src->color_range;
276 dst->chroma_sample_location = src->chroma_sample_location;
277
278 dst->hwaccel = src->hwaccel;
279 dst->hwaccel_context = src->hwaccel_context;
280
281 dst->channels = src->channels;
282 dst->sample_rate = src->sample_rate;
283 dst->sample_fmt = src->sample_fmt;
284 dst->channel_layout = src->channel_layout;
285 dst->internal->hwaccel_priv_data = src->internal->hwaccel_priv_data;
286
287 if (!!dst->hw_frames_ctx != !!src->hw_frames_ctx ||
288 (dst->hw_frames_ctx && dst->hw_frames_ctx->data != src->hw_frames_ctx->data)) {
289 av_buffer_unref(&dst->hw_frames_ctx);
290
291 if (src->hw_frames_ctx) {
292 dst->hw_frames_ctx = av_buffer_ref(src->hw_frames_ctx);
293 if (!dst->hw_frames_ctx)
294 return AVERROR(ENOMEM);
295 }
296 }
297
298 dst->hwaccel_flags = src->hwaccel_flags;
299 }
300
301 if (for_user) {
302 dst->delay = src->thread_count - 1;
303 #if FF_API_CODED_FRAME
304 FF_DISABLE_DEPRECATION_WARNINGS
305 dst->coded_frame = src->coded_frame;
306 FF_ENABLE_DEPRECATION_WARNINGS
307 #endif
308 } else {
309 if (dst->codec->update_thread_context)
310 err = dst->codec->update_thread_context(dst, src);
311 }
312
313 return err;
314 }
315
316 /**
317 * Update the next thread's AVCodecContext with values set by the user.
318 *
319 * @param dst The destination context.
320 * @param src The source context.
321 * @return 0 on success, negative error code on failure
322 */
update_context_from_user(AVCodecContext * dst,AVCodecContext * src)323 static int update_context_from_user(AVCodecContext *dst, AVCodecContext *src)
324 {
325 #define copy_fields(s, e) memcpy(&dst->s, &src->s, (char*)&dst->e - (char*)&dst->s);
326 dst->flags = src->flags;
327
328 dst->draw_horiz_band= src->draw_horiz_band;
329 dst->get_buffer2 = src->get_buffer2;
330
331 dst->opaque = src->opaque;
332 dst->debug = src->debug;
333 dst->debug_mv = src->debug_mv;
334
335 dst->slice_flags = src->slice_flags;
336 dst->flags2 = src->flags2;
337
338 copy_fields(skip_loop_filter, subtitle_header);
339
340 dst->frame_number = src->frame_number;
341 dst->reordered_opaque = src->reordered_opaque;
342 dst->thread_safe_callbacks = src->thread_safe_callbacks;
343
344 if (src->slice_count && src->slice_offset) {
345 if (dst->slice_count < src->slice_count) {
346 int err = av_reallocp_array(&dst->slice_offset, src->slice_count,
347 sizeof(*dst->slice_offset));
348 if (err < 0)
349 return err;
350 }
351 memcpy(dst->slice_offset, src->slice_offset,
352 src->slice_count * sizeof(*dst->slice_offset));
353 }
354 dst->slice_count = src->slice_count;
355 return 0;
356 #undef copy_fields
357 }
358
359 /// Releases the buffers that this decoding thread was the last user of.
release_delayed_buffers(PerThreadContext * p)360 static void release_delayed_buffers(PerThreadContext *p)
361 {
362 FrameThreadContext *fctx = p->parent;
363
364 while (p->num_released_buffers > 0) {
365 AVFrame *f;
366
367 pthread_mutex_lock(&fctx->buffer_mutex);
368
369 // fix extended data in case the caller screwed it up
370 av_assert0(p->avctx->codec_type == AVMEDIA_TYPE_VIDEO ||
371 p->avctx->codec_type == AVMEDIA_TYPE_AUDIO);
372 f = &p->released_buffers[--p->num_released_buffers];
373 f->extended_data = f->data;
374 av_frame_unref(f);
375
376 pthread_mutex_unlock(&fctx->buffer_mutex);
377 }
378 }
379
submit_packet(PerThreadContext * p,AVCodecContext * user_avctx,AVPacket * avpkt)380 static int submit_packet(PerThreadContext *p, AVCodecContext *user_avctx,
381 AVPacket *avpkt)
382 {
383 FrameThreadContext *fctx = p->parent;
384 PerThreadContext *prev_thread = fctx->prev_thread;
385 const AVCodec *codec = p->avctx->codec;
386 int ret;
387
388 if (!avpkt->size && !(codec->capabilities & AV_CODEC_CAP_DELAY))
389 return 0;
390
391 pthread_mutex_lock(&p->mutex);
392
393 ret = update_context_from_user(p->avctx, user_avctx);
394 if (ret) {
395 pthread_mutex_unlock(&p->mutex);
396 return ret;
397 }
398 atomic_store_explicit(&p->debug_threads,
399 (p->avctx->debug & FF_DEBUG_THREADS) != 0,
400 memory_order_relaxed);
401
402 release_delayed_buffers(p);
403
404 if (prev_thread) {
405 int err;
406 if (atomic_load(&prev_thread->state) == STATE_SETTING_UP) {
407 pthread_mutex_lock(&prev_thread->progress_mutex);
408 while (atomic_load(&prev_thread->state) == STATE_SETTING_UP)
409 pthread_cond_wait(&prev_thread->progress_cond, &prev_thread->progress_mutex);
410 pthread_mutex_unlock(&prev_thread->progress_mutex);
411 }
412
413 err = update_context_from_thread(p->avctx, prev_thread->avctx, 0);
414 if (err) {
415 pthread_mutex_unlock(&p->mutex);
416 return err;
417 }
418 }
419
420 av_packet_unref(&p->avpkt);
421 ret = av_packet_ref(&p->avpkt, avpkt);
422 if (ret < 0) {
423 pthread_mutex_unlock(&p->mutex);
424 av_log(p->avctx, AV_LOG_ERROR, "av_packet_ref() failed in submit_packet()\n");
425 return ret;
426 }
427
428 atomic_store(&p->state, STATE_SETTING_UP);
429 pthread_cond_signal(&p->input_cond);
430 pthread_mutex_unlock(&p->mutex);
431
432 /*
433 * If the client doesn't have a thread-safe get_buffer(),
434 * then decoding threads call back to the main thread,
435 * and it calls back to the client here.
436 */
437
438 if (!p->avctx->thread_safe_callbacks && (
439 p->avctx->get_format != avcodec_default_get_format ||
440 p->avctx->get_buffer2 != avcodec_default_get_buffer2)) {
441 while (atomic_load(&p->state) != STATE_SETUP_FINISHED && atomic_load(&p->state) != STATE_INPUT_READY) {
442 int call_done = 1;
443 pthread_mutex_lock(&p->progress_mutex);
444 while (atomic_load(&p->state) == STATE_SETTING_UP)
445 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
446
447 switch (atomic_load_explicit(&p->state, memory_order_acquire)) {
448 case STATE_GET_BUFFER:
449 p->result = ff_get_buffer(p->avctx, p->requested_frame, p->requested_flags);
450 break;
451 case STATE_GET_FORMAT:
452 p->result_format = ff_get_format(p->avctx, p->available_formats);
453 break;
454 default:
455 call_done = 0;
456 break;
457 }
458 if (call_done) {
459 atomic_store(&p->state, STATE_SETTING_UP);
460 pthread_cond_signal(&p->progress_cond);
461 }
462 pthread_mutex_unlock(&p->progress_mutex);
463 }
464 }
465
466 fctx->prev_thread = p;
467 fctx->next_decoding++;
468
469 return 0;
470 }
471
ff_thread_decode_frame(AVCodecContext * avctx,AVFrame * picture,int * got_picture_ptr,AVPacket * avpkt)472 int ff_thread_decode_frame(AVCodecContext *avctx,
473 AVFrame *picture, int *got_picture_ptr,
474 AVPacket *avpkt)
475 {
476 FrameThreadContext *fctx = avctx->internal->thread_ctx;
477 int finished = fctx->next_finished;
478 PerThreadContext *p;
479 int err;
480
481 /* release the async lock, permitting blocked hwaccel threads to
482 * go forward while we are in this function */
483 async_unlock(fctx);
484
485 /*
486 * Submit a packet to the next decoding thread.
487 */
488
489 p = &fctx->threads[fctx->next_decoding];
490 err = submit_packet(p, avctx, avpkt);
491 if (err)
492 goto finish;
493
494 /*
495 * If we're still receiving the initial packets, don't return a frame.
496 */
497
498 if (fctx->next_decoding > (avctx->thread_count-1-(avctx->codec_id == AV_CODEC_ID_FFV1)))
499 fctx->delaying = 0;
500
501 if (fctx->delaying) {
502 *got_picture_ptr=0;
503 if (avpkt->size) {
504 err = avpkt->size;
505 goto finish;
506 }
507 }
508
509 /*
510 * Return the next available frame from the oldest thread.
511 * If we're at the end of the stream, then we have to skip threads that
512 * didn't output a frame/error, because we don't want to accidentally signal
513 * EOF (avpkt->size == 0 && *got_picture_ptr == 0 && err >= 0).
514 */
515
516 do {
517 p = &fctx->threads[finished++];
518
519 if (atomic_load(&p->state) != STATE_INPUT_READY) {
520 pthread_mutex_lock(&p->progress_mutex);
521 while (atomic_load_explicit(&p->state, memory_order_relaxed) != STATE_INPUT_READY)
522 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
523 pthread_mutex_unlock(&p->progress_mutex);
524 }
525
526 av_frame_move_ref(picture, p->frame);
527 *got_picture_ptr = p->got_frame;
528 picture->pkt_dts = p->avpkt.dts;
529 err = p->result;
530
531 /*
532 * A later call with avkpt->size == 0 may loop over all threads,
533 * including this one, searching for a frame/error to return before being
534 * stopped by the "finished != fctx->next_finished" condition.
535 * Make sure we don't mistakenly return the same frame/error again.
536 */
537 p->got_frame = 0;
538 p->result = 0;
539
540 if (finished >= avctx->thread_count) finished = 0;
541 } while (!avpkt->size && !*got_picture_ptr && err >= 0 && finished != fctx->next_finished);
542
543 update_context_from_thread(avctx, p->avctx, 1);
544
545 if (fctx->next_decoding >= avctx->thread_count) fctx->next_decoding = 0;
546
547 fctx->next_finished = finished;
548
549 /* return the size of the consumed packet if no error occurred */
550 if (err >= 0)
551 err = avpkt->size;
552 finish:
553 async_lock(fctx);
554 return err;
555 }
556
ff_thread_report_progress(ThreadFrame * f,int n,int field)557 void ff_thread_report_progress(ThreadFrame *f, int n, int field)
558 {
559 PerThreadContext *p;
560 atomic_int *progress = f->progress ? (atomic_int*)f->progress->data : NULL;
561
562 if (!progress ||
563 atomic_load_explicit(&progress[field], memory_order_relaxed) >= n)
564 return;
565
566 p = f->owner[field]->internal->thread_ctx;
567
568 if (atomic_load_explicit(&p->debug_threads, memory_order_relaxed))
569 av_log(f->owner[field], AV_LOG_DEBUG,
570 "%p finished %d field %d\n", progress, n, field);
571
572 pthread_mutex_lock(&p->progress_mutex);
573
574 atomic_store_explicit(&progress[field], n, memory_order_release);
575
576 pthread_cond_broadcast(&p->progress_cond);
577 pthread_mutex_unlock(&p->progress_mutex);
578 }
579
ff_thread_await_progress(ThreadFrame * f,int n,int field)580 void ff_thread_await_progress(ThreadFrame *f, int n, int field)
581 {
582 PerThreadContext *p;
583 atomic_int *progress = f->progress ? (atomic_int*)f->progress->data : NULL;
584
585 if (!progress ||
586 atomic_load_explicit(&progress[field], memory_order_acquire) >= n)
587 return;
588
589 p = f->owner[field]->internal->thread_ctx;
590
591 if (atomic_load_explicit(&p->debug_threads, memory_order_relaxed))
592 av_log(f->owner[field], AV_LOG_DEBUG,
593 "thread awaiting %d field %d from %p\n", n, field, progress);
594
595 pthread_mutex_lock(&p->progress_mutex);
596 while (atomic_load_explicit(&progress[field], memory_order_relaxed) < n)
597 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
598 pthread_mutex_unlock(&p->progress_mutex);
599 }
600
ff_thread_finish_setup(AVCodecContext * avctx)601 void ff_thread_finish_setup(AVCodecContext *avctx) {
602 PerThreadContext *p = avctx->internal->thread_ctx;
603
604 if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
605
606 if (avctx->hwaccel && !p->hwaccel_serializing) {
607 pthread_mutex_lock(&p->parent->hwaccel_mutex);
608 p->hwaccel_serializing = 1;
609 }
610
611 /* this assumes that no hwaccel calls happen before ff_thread_finish_setup() */
612 if (avctx->hwaccel &&
613 !(avctx->hwaccel->caps_internal & HWACCEL_CAP_ASYNC_SAFE)) {
614 p->async_serializing = 1;
615
616 async_lock(p->parent);
617 }
618
619 pthread_mutex_lock(&p->progress_mutex);
620 if(atomic_load(&p->state) == STATE_SETUP_FINISHED){
621 av_log(avctx, AV_LOG_WARNING, "Multiple ff_thread_finish_setup() calls\n");
622 }
623
624 atomic_store(&p->state, STATE_SETUP_FINISHED);
625
626 pthread_cond_broadcast(&p->progress_cond);
627 pthread_mutex_unlock(&p->progress_mutex);
628 }
629
630 /// Waits for all threads to finish.
park_frame_worker_threads(FrameThreadContext * fctx,int thread_count)631 static void park_frame_worker_threads(FrameThreadContext *fctx, int thread_count)
632 {
633 int i;
634
635 async_unlock(fctx);
636
637 for (i = 0; i < thread_count; i++) {
638 PerThreadContext *p = &fctx->threads[i];
639
640 if (atomic_load(&p->state) != STATE_INPUT_READY) {
641 pthread_mutex_lock(&p->progress_mutex);
642 while (atomic_load(&p->state) != STATE_INPUT_READY)
643 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
644 pthread_mutex_unlock(&p->progress_mutex);
645 }
646 p->got_frame = 0;
647 }
648
649 async_lock(fctx);
650 }
651
ff_frame_thread_free(AVCodecContext * avctx,int thread_count)652 void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
653 {
654 FrameThreadContext *fctx = avctx->internal->thread_ctx;
655 const AVCodec *codec = avctx->codec;
656 int i;
657
658 park_frame_worker_threads(fctx, thread_count);
659
660 if (fctx->prev_thread && fctx->prev_thread != fctx->threads)
661 if (update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0) < 0) {
662 av_log(avctx, AV_LOG_ERROR, "Final thread update failed\n");
663 fctx->prev_thread->avctx->internal->is_copy = fctx->threads->avctx->internal->is_copy;
664 fctx->threads->avctx->internal->is_copy = 1;
665 }
666
667 for (i = 0; i < thread_count; i++) {
668 PerThreadContext *p = &fctx->threads[i];
669
670 pthread_mutex_lock(&p->mutex);
671 p->die = 1;
672 pthread_cond_signal(&p->input_cond);
673 pthread_mutex_unlock(&p->mutex);
674
675 if (p->thread_init)
676 pthread_join(p->thread, NULL);
677 p->thread_init=0;
678
679 if (codec->close && p->avctx)
680 codec->close(p->avctx);
681
682 release_delayed_buffers(p);
683 av_frame_free(&p->frame);
684 }
685
686 for (i = 0; i < thread_count; i++) {
687 PerThreadContext *p = &fctx->threads[i];
688
689 pthread_mutex_destroy(&p->mutex);
690 pthread_mutex_destroy(&p->progress_mutex);
691 pthread_cond_destroy(&p->input_cond);
692 pthread_cond_destroy(&p->progress_cond);
693 pthread_cond_destroy(&p->output_cond);
694 av_packet_unref(&p->avpkt);
695 av_freep(&p->released_buffers);
696
697 if (i && p->avctx) {
698 av_freep(&p->avctx->priv_data);
699 av_freep(&p->avctx->slice_offset);
700 }
701
702 if (p->avctx) {
703 av_freep(&p->avctx->internal);
704 av_buffer_unref(&p->avctx->hw_frames_ctx);
705 }
706
707 av_freep(&p->avctx);
708 }
709
710 av_freep(&fctx->threads);
711 pthread_mutex_destroy(&fctx->buffer_mutex);
712 pthread_mutex_destroy(&fctx->hwaccel_mutex);
713 pthread_mutex_destroy(&fctx->async_mutex);
714 pthread_cond_destroy(&fctx->async_cond);
715
716 av_freep(&avctx->internal->thread_ctx);
717
718 if (avctx->priv_data && avctx->codec && avctx->codec->priv_class)
719 av_opt_free(avctx->priv_data);
720 avctx->codec = NULL;
721 }
722
ff_frame_thread_init(AVCodecContext * avctx)723 int ff_frame_thread_init(AVCodecContext *avctx)
724 {
725 int thread_count = avctx->thread_count;
726 const AVCodec *codec = avctx->codec;
727 AVCodecContext *src = avctx;
728 FrameThreadContext *fctx;
729 int i, err = 0;
730
731 if (!thread_count) {
732 int nb_cpus = av_cpu_count();
733 #if FF_API_DEBUG_MV
734 if ((avctx->debug & (FF_DEBUG_VIS_QP | FF_DEBUG_VIS_MB_TYPE)) || avctx->debug_mv)
735 nb_cpus = 1;
736 #endif
737 // use number of cores + 1 as thread count if there is more than one
738 if (nb_cpus > 1)
739 thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
740 else
741 thread_count = avctx->thread_count = 1;
742 }
743
744 if (thread_count <= 1) {
745 avctx->active_thread_type = 0;
746 return 0;
747 }
748
749 avctx->internal->thread_ctx = fctx = av_mallocz(sizeof(FrameThreadContext));
750 if (!fctx)
751 return AVERROR(ENOMEM);
752
753 fctx->threads = av_mallocz_array(thread_count, sizeof(PerThreadContext));
754 if (!fctx->threads) {
755 av_freep(&avctx->internal->thread_ctx);
756 return AVERROR(ENOMEM);
757 }
758
759 pthread_mutex_init(&fctx->buffer_mutex, NULL);
760 pthread_mutex_init(&fctx->hwaccel_mutex, NULL);
761 pthread_mutex_init(&fctx->async_mutex, NULL);
762 pthread_cond_init(&fctx->async_cond, NULL);
763
764 fctx->async_lock = 1;
765 fctx->delaying = 1;
766
767 for (i = 0; i < thread_count; i++) {
768 AVCodecContext *copy = av_malloc(sizeof(AVCodecContext));
769 PerThreadContext *p = &fctx->threads[i];
770
771 pthread_mutex_init(&p->mutex, NULL);
772 pthread_mutex_init(&p->progress_mutex, NULL);
773 pthread_cond_init(&p->input_cond, NULL);
774 pthread_cond_init(&p->progress_cond, NULL);
775 pthread_cond_init(&p->output_cond, NULL);
776
777 p->frame = av_frame_alloc();
778 if (!p->frame) {
779 av_freep(©);
780 err = AVERROR(ENOMEM);
781 goto error;
782 }
783
784 p->parent = fctx;
785 p->avctx = copy;
786
787 if (!copy) {
788 err = AVERROR(ENOMEM);
789 goto error;
790 }
791
792 *copy = *src;
793
794 copy->internal = av_malloc(sizeof(AVCodecInternal));
795 if (!copy->internal) {
796 copy->priv_data = NULL;
797 err = AVERROR(ENOMEM);
798 goto error;
799 }
800 *copy->internal = *src->internal;
801 copy->internal->thread_ctx = p;
802 copy->internal->last_pkt_props = &p->avpkt;
803
804 if (!i) {
805 src = copy;
806
807 if (codec->init)
808 err = codec->init(copy);
809
810 update_context_from_thread(avctx, copy, 1);
811 } else {
812 copy->priv_data = av_malloc(codec->priv_data_size);
813 if (!copy->priv_data) {
814 err = AVERROR(ENOMEM);
815 goto error;
816 }
817 memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
818 copy->internal->is_copy = 1;
819
820 if (codec->init_thread_copy)
821 err = codec->init_thread_copy(copy);
822 }
823
824 if (err) goto error;
825
826 atomic_init(&p->debug_threads, (copy->debug & FF_DEBUG_THREADS) != 0);
827
828 err = AVERROR(pthread_create(&p->thread, NULL, frame_worker_thread, p));
829 p->thread_init= !err;
830 if(!p->thread_init)
831 goto error;
832 }
833
834 return 0;
835
836 error:
837 ff_frame_thread_free(avctx, i+1);
838
839 return err;
840 }
841
ff_thread_flush(AVCodecContext * avctx)842 void ff_thread_flush(AVCodecContext *avctx)
843 {
844 int i;
845 FrameThreadContext *fctx = avctx->internal->thread_ctx;
846
847 if (!fctx) return;
848
849 park_frame_worker_threads(fctx, avctx->thread_count);
850 if (fctx->prev_thread) {
851 if (fctx->prev_thread != &fctx->threads[0])
852 update_context_from_thread(fctx->threads[0].avctx, fctx->prev_thread->avctx, 0);
853 }
854
855 fctx->next_decoding = fctx->next_finished = 0;
856 fctx->delaying = 1;
857 fctx->prev_thread = NULL;
858 for (i = 0; i < avctx->thread_count; i++) {
859 PerThreadContext *p = &fctx->threads[i];
860 // Make sure decode flush calls with size=0 won't return old frames
861 p->got_frame = 0;
862 av_frame_unref(p->frame);
863 p->result = 0;
864
865 release_delayed_buffers(p);
866
867 if (avctx->codec->flush)
868 avctx->codec->flush(p->avctx);
869 }
870 }
871
ff_thread_can_start_frame(AVCodecContext * avctx)872 int ff_thread_can_start_frame(AVCodecContext *avctx)
873 {
874 PerThreadContext *p = avctx->internal->thread_ctx;
875 if ((avctx->active_thread_type&FF_THREAD_FRAME) && atomic_load(&p->state) != STATE_SETTING_UP &&
876 (avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {
877 return 0;
878 }
879 return 1;
880 }
881
thread_get_buffer_internal(AVCodecContext * avctx,ThreadFrame * f,int flags)882 static int thread_get_buffer_internal(AVCodecContext *avctx, ThreadFrame *f, int flags)
883 {
884 PerThreadContext *p = avctx->internal->thread_ctx;
885 int err;
886
887 f->owner[0] = f->owner[1] = avctx;
888
889 if (!(avctx->active_thread_type & FF_THREAD_FRAME))
890 return ff_get_buffer(avctx, f->f, flags);
891
892 if (atomic_load(&p->state) != STATE_SETTING_UP &&
893 (avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {
894 av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
895 return -1;
896 }
897
898 if (avctx->internal->allocate_progress) {
899 atomic_int *progress;
900 f->progress = av_buffer_alloc(2 * sizeof(*progress));
901 if (!f->progress) {
902 return AVERROR(ENOMEM);
903 }
904 progress = (atomic_int*)f->progress->data;
905
906 atomic_init(&progress[0], -1);
907 atomic_init(&progress[1], -1);
908 }
909
910 pthread_mutex_lock(&p->parent->buffer_mutex);
911 if (THREAD_SAFE_CALLBACKS(avctx)) {
912 err = ff_get_buffer(avctx, f->f, flags);
913 } else {
914 pthread_mutex_lock(&p->progress_mutex);
915 p->requested_frame = f->f;
916 p->requested_flags = flags;
917 atomic_store_explicit(&p->state, STATE_GET_BUFFER, memory_order_release);
918 pthread_cond_broadcast(&p->progress_cond);
919
920 while (atomic_load(&p->state) != STATE_SETTING_UP)
921 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
922
923 err = p->result;
924
925 pthread_mutex_unlock(&p->progress_mutex);
926
927 }
928 if (!THREAD_SAFE_CALLBACKS(avctx) && !avctx->codec->update_thread_context)
929 ff_thread_finish_setup(avctx);
930 if (err)
931 av_buffer_unref(&f->progress);
932
933 pthread_mutex_unlock(&p->parent->buffer_mutex);
934
935 return err;
936 }
937
ff_thread_get_format(AVCodecContext * avctx,const enum AVPixelFormat * fmt)938 enum AVPixelFormat ff_thread_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
939 {
940 enum AVPixelFormat res;
941 PerThreadContext *p = avctx->internal->thread_ctx;
942 if (!(avctx->active_thread_type & FF_THREAD_FRAME) || avctx->thread_safe_callbacks ||
943 avctx->get_format == avcodec_default_get_format)
944 return ff_get_format(avctx, fmt);
945 if (atomic_load(&p->state) != STATE_SETTING_UP) {
946 av_log(avctx, AV_LOG_ERROR, "get_format() cannot be called after ff_thread_finish_setup()\n");
947 return -1;
948 }
949 pthread_mutex_lock(&p->progress_mutex);
950 p->available_formats = fmt;
951 atomic_store(&p->state, STATE_GET_FORMAT);
952 pthread_cond_broadcast(&p->progress_cond);
953
954 while (atomic_load(&p->state) != STATE_SETTING_UP)
955 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
956
957 res = p->result_format;
958
959 pthread_mutex_unlock(&p->progress_mutex);
960
961 return res;
962 }
963
ff_thread_get_buffer(AVCodecContext * avctx,ThreadFrame * f,int flags)964 int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
965 {
966 int ret = thread_get_buffer_internal(avctx, f, flags);
967 if (ret < 0)
968 av_log(avctx, AV_LOG_ERROR, "thread_get_buffer() failed\n");
969 return ret;
970 }
971
ff_thread_release_buffer(AVCodecContext * avctx,ThreadFrame * f)972 void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
973 {
974 PerThreadContext *p = avctx->internal->thread_ctx;
975 FrameThreadContext *fctx;
976 AVFrame *dst, *tmp;
977 int can_direct_free = !(avctx->active_thread_type & FF_THREAD_FRAME) ||
978 THREAD_SAFE_CALLBACKS(avctx);
979
980 if (!f->f || !f->f->buf[0])
981 return;
982
983 if (avctx->debug & FF_DEBUG_BUFFERS)
984 av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p\n", f);
985
986 av_buffer_unref(&f->progress);
987 f->owner[0] = f->owner[1] = NULL;
988
989 if (can_direct_free) {
990 av_frame_unref(f->f);
991 return;
992 }
993
994 fctx = p->parent;
995 pthread_mutex_lock(&fctx->buffer_mutex);
996
997 if (p->num_released_buffers + 1 >= INT_MAX / sizeof(*p->released_buffers))
998 goto fail;
999 tmp = av_fast_realloc(p->released_buffers, &p->released_buffers_allocated,
1000 (p->num_released_buffers + 1) *
1001 sizeof(*p->released_buffers));
1002 if (!tmp)
1003 goto fail;
1004 p->released_buffers = tmp;
1005
1006 dst = &p->released_buffers[p->num_released_buffers];
1007 av_frame_move_ref(dst, f->f);
1008
1009 p->num_released_buffers++;
1010
1011 fail:
1012 pthread_mutex_unlock(&fctx->buffer_mutex);
1013 }
1014