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 <stdint.h>
28
29 #include "avcodec.h"
30 #include "internal.h"
31 #include "pthread_internal.h"
32 #include "thread.h"
33 #include "version.h"
34
35 #include "libavutil/avassert.h"
36 #include "libavutil/buffer.h"
37 #include "libavutil/common.h"
38 #include "libavutil/cpu.h"
39 #include "libavutil/frame.h"
40 #include "libavutil/internal.h"
41 #include "libavutil/log.h"
42 #include "libavutil/mem.h"
43 #include "libavutil/opt.h"
44 #include "libavutil/thread.h"
45
46 #if defined(MOZ_TSAN)
47 typedef _Atomic(int) atomic_int;
48 #else
49 typedef volatile int atomic_int;
50 #endif
51
52 /**
53 * Context used by codec threads and stored in their AVCodecInternal thread_ctx.
54 */
55 typedef enum {
56 STATE_INPUT_READY, ///< Set when the thread is awaiting a packet.
57 STATE_SETTING_UP, ///< Set before the codec has called ff_thread_finish_setup().
58 STATE_GET_BUFFER, /**<
59 * Set when the codec calls get_buffer().
60 * State is returned to STATE_SETTING_UP afterwards.
61 */
62 STATE_GET_FORMAT, /**<
63 * Set when the codec calls get_format().
64 * State is returned to STATE_SETTING_UP afterwards.
65 */
66 STATE_SETUP_FINISHED ///< Set after the codec has called ff_thread_finish_setup().
67 } State;
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 const enum AVPixelFormat *available_formats; ///< Format array for get_format()
103 enum AVPixelFormat result_format; ///< get_format() result
104
105 int die; ///< Set when the thread should exit.
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 int next_decoding; ///< The next context to submit a packet to.
118 int next_finished; ///< The next context to return output from.
119
120 int delaying; /**<
121 * Set for the first N packets, where N is the number of threads.
122 * While it is set, ff_thread_en/decode_frame won't return any results.
123 */
124 } FrameThreadContext;
125
126 #define THREAD_SAFE_CALLBACKS(avctx) \
127 ((avctx)->thread_safe_callbacks || (avctx)->get_buffer2 == avcodec_default_get_buffer2)
128
129 /**
130 * Codec worker thread.
131 *
132 * Automatically calls ff_thread_finish_setup() if the codec does
133 * not provide an update_thread_context method, or if the codec returns
134 * before calling it.
135 */
frame_worker_thread(void * arg)136 static attribute_align_arg void *frame_worker_thread(void *arg)
137 {
138 PerThreadContext *p = arg;
139 AVCodecContext *avctx = p->avctx;
140 const AVCodec *codec = avctx->codec;
141
142 pthread_mutex_lock(&p->mutex);
143 while (1) {
144 while (p->state == STATE_INPUT_READY && !p->die)
145 pthread_cond_wait(&p->input_cond, &p->mutex);
146
147 if (p->die) break;
148
149 if (!codec->update_thread_context && THREAD_SAFE_CALLBACKS(avctx))
150 ff_thread_finish_setup(avctx);
151
152 av_frame_unref(p->frame);
153 p->got_frame = 0;
154 p->result = codec->decode(avctx, p->frame, &p->got_frame, &p->avpkt);
155
156 if ((p->result < 0 || !p->got_frame) && p->frame->buf[0]) {
157 if (avctx->internal->allocate_progress)
158 av_log(avctx, AV_LOG_ERROR, "A frame threaded decoder did not "
159 "free the frame on failure. This is a bug, please report it.\n");
160 av_frame_unref(p->frame);
161 }
162
163 if (p->state == STATE_SETTING_UP) ff_thread_finish_setup(avctx);
164
165 pthread_mutex_lock(&p->progress_mutex);
166 #if 0 //BUFREF-FIXME
167 for (i = 0; i < MAX_BUFFERS; i++)
168 if (p->progress_used[i] && (p->got_frame || p->result<0 || avctx->codec_id != AV_CODEC_ID_H264)) {
169 p->progress[i][0] = INT_MAX;
170 p->progress[i][1] = INT_MAX;
171 }
172 #endif
173 p->state = STATE_INPUT_READY;
174
175 pthread_cond_broadcast(&p->progress_cond);
176 pthread_cond_signal(&p->output_cond);
177 pthread_mutex_unlock(&p->progress_mutex);
178 }
179 pthread_mutex_unlock(&p->mutex);
180
181 return NULL;
182 }
183
184 /**
185 * Update the next thread's AVCodecContext with values from the reference thread's context.
186 *
187 * @param dst The destination context.
188 * @param src The source context.
189 * @param for_user 0 if the destination is a codec thread, 1 if the destination is the user's thread
190 * @return 0 on success, negative error code on failure
191 */
update_context_from_thread(AVCodecContext * dst,AVCodecContext * src,int for_user)192 static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src, int for_user)
193 {
194 int err = 0;
195
196 if (dst != src) {
197 dst->time_base = src->time_base;
198 dst->framerate = src->framerate;
199 dst->width = src->width;
200 dst->height = src->height;
201 dst->pix_fmt = src->pix_fmt;
202
203 dst->coded_width = src->coded_width;
204 dst->coded_height = src->coded_height;
205
206 dst->has_b_frames = src->has_b_frames;
207 dst->idct_algo = src->idct_algo;
208
209 dst->bits_per_coded_sample = src->bits_per_coded_sample;
210 dst->sample_aspect_ratio = src->sample_aspect_ratio;
211 #if FF_API_AFD
212 FF_DISABLE_DEPRECATION_WARNINGS
213 dst->dtg_active_format = src->dtg_active_format;
214 FF_ENABLE_DEPRECATION_WARNINGS
215 #endif /* FF_API_AFD */
216
217 dst->profile = src->profile;
218 dst->level = src->level;
219
220 dst->bits_per_raw_sample = src->bits_per_raw_sample;
221 dst->ticks_per_frame = src->ticks_per_frame;
222 dst->color_primaries = src->color_primaries;
223
224 dst->color_trc = src->color_trc;
225 dst->colorspace = src->colorspace;
226 dst->color_range = src->color_range;
227 dst->chroma_sample_location = src->chroma_sample_location;
228
229 dst->hwaccel = src->hwaccel;
230 dst->hwaccel_context = src->hwaccel_context;
231
232 dst->channels = src->channels;
233 dst->sample_rate = src->sample_rate;
234 dst->sample_fmt = src->sample_fmt;
235 dst->channel_layout = src->channel_layout;
236 dst->internal->hwaccel_priv_data = src->internal->hwaccel_priv_data;
237 }
238
239 if (for_user) {
240 dst->delay = src->thread_count - 1;
241 #if FF_API_CODED_FRAME
242 FF_DISABLE_DEPRECATION_WARNINGS
243 dst->coded_frame = src->coded_frame;
244 FF_ENABLE_DEPRECATION_WARNINGS
245 #endif
246 } else {
247 if (dst->codec->update_thread_context)
248 err = dst->codec->update_thread_context(dst, src);
249 }
250
251 return err;
252 }
253
254 /**
255 * Update the next thread's AVCodecContext with values set by the user.
256 *
257 * @param dst The destination context.
258 * @param src The source context.
259 * @return 0 on success, negative error code on failure
260 */
update_context_from_user(AVCodecContext * dst,AVCodecContext * src)261 static int update_context_from_user(AVCodecContext *dst, AVCodecContext *src)
262 {
263 #define copy_fields(s, e) memcpy(&dst->s, &src->s, (char*)&dst->e - (char*)&dst->s);
264 dst->flags = src->flags;
265
266 dst->draw_horiz_band= src->draw_horiz_band;
267 dst->get_buffer2 = src->get_buffer2;
268
269 dst->opaque = src->opaque;
270 dst->debug = src->debug;
271 dst->debug_mv = src->debug_mv;
272
273 dst->slice_flags = src->slice_flags;
274 dst->flags2 = src->flags2;
275
276 copy_fields(skip_loop_filter, subtitle_header);
277
278 dst->frame_number = src->frame_number;
279 dst->reordered_opaque = src->reordered_opaque;
280 dst->thread_safe_callbacks = src->thread_safe_callbacks;
281
282 if (src->slice_count && src->slice_offset) {
283 if (dst->slice_count < src->slice_count) {
284 int err = av_reallocp_array(&dst->slice_offset, src->slice_count,
285 sizeof(*dst->slice_offset));
286 if (err < 0)
287 return err;
288 }
289 memcpy(dst->slice_offset, src->slice_offset,
290 src->slice_count * sizeof(*dst->slice_offset));
291 }
292 dst->slice_count = src->slice_count;
293 return 0;
294 #undef copy_fields
295 }
296
297 /// Releases the buffers that this decoding thread was the last user of.
release_delayed_buffers(PerThreadContext * p)298 static void release_delayed_buffers(PerThreadContext *p)
299 {
300 FrameThreadContext *fctx = p->parent;
301
302 while (p->num_released_buffers > 0) {
303 AVFrame *f;
304
305 pthread_mutex_lock(&fctx->buffer_mutex);
306
307 // fix extended data in case the caller screwed it up
308 av_assert0(p->avctx->codec_type == AVMEDIA_TYPE_VIDEO ||
309 p->avctx->codec_type == AVMEDIA_TYPE_AUDIO);
310 f = &p->released_buffers[--p->num_released_buffers];
311 f->extended_data = f->data;
312 av_frame_unref(f);
313
314 pthread_mutex_unlock(&fctx->buffer_mutex);
315 }
316 }
317
submit_packet(PerThreadContext * p,AVPacket * avpkt)318 static int submit_packet(PerThreadContext *p, AVPacket *avpkt)
319 {
320 FrameThreadContext *fctx = p->parent;
321 PerThreadContext *prev_thread = fctx->prev_thread;
322 const AVCodec *codec = p->avctx->codec;
323
324 if (!avpkt->size && !(codec->capabilities & AV_CODEC_CAP_DELAY))
325 return 0;
326
327 pthread_mutex_lock(&p->mutex);
328
329 release_delayed_buffers(p);
330
331 if (prev_thread) {
332 int err;
333 if (prev_thread->state == STATE_SETTING_UP) {
334 pthread_mutex_lock(&prev_thread->progress_mutex);
335 while (prev_thread->state == STATE_SETTING_UP)
336 pthread_cond_wait(&prev_thread->progress_cond, &prev_thread->progress_mutex);
337 pthread_mutex_unlock(&prev_thread->progress_mutex);
338 }
339
340 err = update_context_from_thread(p->avctx, prev_thread->avctx, 0);
341 if (err) {
342 pthread_mutex_unlock(&p->mutex);
343 return err;
344 }
345 }
346
347 av_packet_unref(&p->avpkt);
348 av_packet_ref(&p->avpkt, avpkt);
349
350 p->state = STATE_SETTING_UP;
351 pthread_cond_signal(&p->input_cond);
352 pthread_mutex_unlock(&p->mutex);
353
354 /*
355 * If the client doesn't have a thread-safe get_buffer(),
356 * then decoding threads call back to the main thread,
357 * and it calls back to the client here.
358 */
359
360 if (!p->avctx->thread_safe_callbacks && (
361 p->avctx->get_format != avcodec_default_get_format ||
362 p->avctx->get_buffer2 != avcodec_default_get_buffer2)) {
363 while (p->state != STATE_SETUP_FINISHED && p->state != STATE_INPUT_READY) {
364 int call_done = 1;
365 pthread_mutex_lock(&p->progress_mutex);
366 while (p->state == STATE_SETTING_UP)
367 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
368
369 State p_state = (State)p->state;
370 switch (p_state) {
371 case STATE_GET_BUFFER:
372 p->result = ff_get_buffer(p->avctx, p->requested_frame, p->requested_flags);
373 break;
374 case STATE_GET_FORMAT:
375 p->result_format = ff_get_format(p->avctx, p->available_formats);
376 break;
377 default:
378 call_done = 0;
379 break;
380 }
381 if (call_done) {
382 p->state = STATE_SETTING_UP;
383 pthread_cond_signal(&p->progress_cond);
384 }
385 pthread_mutex_unlock(&p->progress_mutex);
386 }
387 }
388
389 fctx->prev_thread = p;
390 fctx->next_decoding++;
391
392 return 0;
393 }
394
ff_thread_decode_frame(AVCodecContext * avctx,AVFrame * picture,int * got_picture_ptr,AVPacket * avpkt)395 int ff_thread_decode_frame(AVCodecContext *avctx,
396 AVFrame *picture, int *got_picture_ptr,
397 AVPacket *avpkt)
398 {
399 FrameThreadContext *fctx = avctx->internal->thread_ctx;
400 int finished = fctx->next_finished;
401 PerThreadContext *p;
402 int err;
403
404 /*
405 * Submit a packet to the next decoding thread.
406 */
407
408 p = &fctx->threads[fctx->next_decoding];
409 err = update_context_from_user(p->avctx, avctx);
410 if (err) return err;
411 err = submit_packet(p, avpkt);
412 if (err) return err;
413
414 /*
415 * If we're still receiving the initial packets, don't return a frame.
416 */
417
418 if (fctx->next_decoding > (avctx->thread_count-1-(avctx->codec_id == AV_CODEC_ID_FFV1)))
419 fctx->delaying = 0;
420
421 if (fctx->delaying) {
422 *got_picture_ptr=0;
423 if (avpkt->size)
424 return avpkt->size;
425 }
426
427 /*
428 * Return the next available frame from the oldest thread.
429 * If we're at the end of the stream, then we have to skip threads that
430 * didn't output a frame, because we don't want to accidentally signal
431 * EOF (avpkt->size == 0 && *got_picture_ptr == 0).
432 */
433
434 do {
435 p = &fctx->threads[finished++];
436
437 if (p->state != STATE_INPUT_READY) {
438 pthread_mutex_lock(&p->progress_mutex);
439 while (p->state != STATE_INPUT_READY)
440 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
441 pthread_mutex_unlock(&p->progress_mutex);
442 }
443
444 av_frame_move_ref(picture, p->frame);
445 *got_picture_ptr = p->got_frame;
446 picture->pkt_dts = p->avpkt.dts;
447
448 if (p->result < 0)
449 err = p->result;
450
451 /*
452 * A later call with avkpt->size == 0 may loop over all threads,
453 * including this one, searching for a frame to return before being
454 * stopped by the "finished != fctx->next_finished" condition.
455 * Make sure we don't mistakenly return the same frame again.
456 */
457 p->got_frame = 0;
458
459 if (finished >= avctx->thread_count) finished = 0;
460 } while (!avpkt->size && !*got_picture_ptr && finished != fctx->next_finished);
461
462 update_context_from_thread(avctx, p->avctx, 1);
463
464 if (fctx->next_decoding >= avctx->thread_count) fctx->next_decoding = 0;
465
466 fctx->next_finished = finished;
467
468 /*
469 * When no frame was found while flushing, but an error occurred in
470 * any thread, return it instead of 0.
471 * Otherwise the error can get lost.
472 */
473 if (!avpkt->size && !*got_picture_ptr)
474 return err;
475
476 /* return the size of the consumed packet if no error occurred */
477 return (p->result >= 0) ? avpkt->size : p->result;
478 }
479
ff_thread_report_progress(ThreadFrame * f,int n,int field)480 void ff_thread_report_progress(ThreadFrame *f, int n, int field)
481 {
482 PerThreadContext *p;
483 atomic_int *progress = f->progress ? (atomic_int*)f->progress->data : NULL;
484
485 if (!progress || progress[field] >= n) return;
486
487 p = f->owner->internal->thread_ctx;
488
489 if (f->owner->debug&FF_DEBUG_THREADS)
490 av_log(f->owner, AV_LOG_DEBUG, "%p finished %d field %d\n", progress, n, field);
491
492 pthread_mutex_lock(&p->progress_mutex);
493 progress[field] = n;
494 pthread_cond_broadcast(&p->progress_cond);
495 pthread_mutex_unlock(&p->progress_mutex);
496 }
497
ff_thread_await_progress(ThreadFrame * f,int n,int field)498 void ff_thread_await_progress(ThreadFrame *f, int n, int field)
499 {
500 PerThreadContext *p;
501 atomic_int *progress = f->progress ? (atomic_int*)f->progress->data : NULL;
502
503 if (!progress || progress[field] >= n) return;
504
505 p = f->owner->internal->thread_ctx;
506
507 if (f->owner->debug&FF_DEBUG_THREADS)
508 av_log(f->owner, AV_LOG_DEBUG, "thread awaiting %d field %d from %p\n", n, field, progress);
509
510 pthread_mutex_lock(&p->progress_mutex);
511 while (progress[field] < n)
512 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
513 pthread_mutex_unlock(&p->progress_mutex);
514 }
515
ff_thread_finish_setup(AVCodecContext * avctx)516 void ff_thread_finish_setup(AVCodecContext *avctx) {
517 PerThreadContext *p = avctx->internal->thread_ctx;
518
519 if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
520
521 if(p->state == STATE_SETUP_FINISHED){
522 av_log(avctx, AV_LOG_WARNING, "Multiple ff_thread_finish_setup() calls\n");
523 }
524
525 pthread_mutex_lock(&p->progress_mutex);
526 p->state = STATE_SETUP_FINISHED;
527 pthread_cond_broadcast(&p->progress_cond);
528 pthread_mutex_unlock(&p->progress_mutex);
529 }
530
531 /// Waits for all threads to finish.
park_frame_worker_threads(FrameThreadContext * fctx,int thread_count)532 static void park_frame_worker_threads(FrameThreadContext *fctx, int thread_count)
533 {
534 int i;
535
536 for (i = 0; i < thread_count; i++) {
537 PerThreadContext *p = &fctx->threads[i];
538
539 if (p->state != STATE_INPUT_READY) {
540 pthread_mutex_lock(&p->progress_mutex);
541 while (p->state != STATE_INPUT_READY)
542 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
543 pthread_mutex_unlock(&p->progress_mutex);
544 }
545 p->got_frame = 0;
546 }
547 }
548
ff_frame_thread_free(AVCodecContext * avctx,int thread_count)549 void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
550 {
551 FrameThreadContext *fctx = avctx->internal->thread_ctx;
552 const AVCodec *codec = avctx->codec;
553 int i;
554
555 park_frame_worker_threads(fctx, thread_count);
556
557 if (fctx->prev_thread && fctx->prev_thread != fctx->threads)
558 if (update_context_from_thread(fctx->threads->avctx, fctx->prev_thread->avctx, 0) < 0) {
559 av_log(avctx, AV_LOG_ERROR, "Final thread update failed\n");
560 fctx->prev_thread->avctx->internal->is_copy = fctx->threads->avctx->internal->is_copy;
561 fctx->threads->avctx->internal->is_copy = 1;
562 }
563
564 for (i = 0; i < thread_count; i++) {
565 PerThreadContext *p = &fctx->threads[i];
566
567 pthread_mutex_lock(&p->mutex);
568 p->die = 1;
569 pthread_cond_signal(&p->input_cond);
570 pthread_mutex_unlock(&p->mutex);
571
572 if (p->thread_init)
573 pthread_join(p->thread, NULL);
574 p->thread_init=0;
575
576 if (codec->close && p->avctx)
577 codec->close(p->avctx);
578
579 release_delayed_buffers(p);
580 av_frame_free(&p->frame);
581 }
582
583 for (i = 0; i < thread_count; i++) {
584 PerThreadContext *p = &fctx->threads[i];
585
586 pthread_mutex_destroy(&p->mutex);
587 pthread_mutex_destroy(&p->progress_mutex);
588 pthread_cond_destroy(&p->input_cond);
589 pthread_cond_destroy(&p->progress_cond);
590 pthread_cond_destroy(&p->output_cond);
591 av_packet_unref(&p->avpkt);
592 av_freep(&p->released_buffers);
593
594 if (i && p->avctx) {
595 av_freep(&p->avctx->priv_data);
596 av_freep(&p->avctx->slice_offset);
597 }
598
599 if (p->avctx)
600 av_freep(&p->avctx->internal);
601 av_freep(&p->avctx);
602 }
603
604 av_freep(&fctx->threads);
605 pthread_mutex_destroy(&fctx->buffer_mutex);
606 av_freep(&avctx->internal->thread_ctx);
607
608 if (avctx->priv_data && avctx->codec && avctx->codec->priv_class)
609 av_opt_free(avctx->priv_data);
610 avctx->codec = NULL;
611 }
612
ff_frame_thread_init(AVCodecContext * avctx)613 int ff_frame_thread_init(AVCodecContext *avctx)
614 {
615 int thread_count = avctx->thread_count;
616 const AVCodec *codec = avctx->codec;
617 AVCodecContext *src = avctx;
618 FrameThreadContext *fctx;
619 int i, err = 0;
620
621 #if HAVE_W32THREADS
622 w32thread_init();
623 #endif
624
625 if (!thread_count) {
626 int nb_cpus = av_cpu_count();
627 if ((avctx->debug & (FF_DEBUG_VIS_QP | FF_DEBUG_VIS_MB_TYPE)) || avctx->debug_mv)
628 nb_cpus = 1;
629 // use number of cores + 1 as thread count if there is more than one
630 if (nb_cpus > 1)
631 thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
632 else
633 thread_count = avctx->thread_count = 1;
634 }
635
636 if (thread_count <= 1) {
637 avctx->active_thread_type = 0;
638 return 0;
639 }
640
641 avctx->internal->thread_ctx = fctx = av_mallocz(sizeof(FrameThreadContext));
642 if (!fctx)
643 return AVERROR(ENOMEM);
644
645 fctx->threads = av_mallocz_array(thread_count, sizeof(PerThreadContext));
646 if (!fctx->threads) {
647 av_freep(&avctx->internal->thread_ctx);
648 return AVERROR(ENOMEM);
649 }
650
651 pthread_mutex_init(&fctx->buffer_mutex, NULL);
652 fctx->delaying = 1;
653
654 for (i = 0; i < thread_count; i++) {
655 AVCodecContext *copy = av_malloc(sizeof(AVCodecContext));
656 PerThreadContext *p = &fctx->threads[i];
657
658 pthread_mutex_init(&p->mutex, NULL);
659 pthread_mutex_init(&p->progress_mutex, NULL);
660 pthread_cond_init(&p->input_cond, NULL);
661 pthread_cond_init(&p->progress_cond, NULL);
662 pthread_cond_init(&p->output_cond, NULL);
663
664 p->frame = av_frame_alloc();
665 if (!p->frame) {
666 av_freep(©);
667 err = AVERROR(ENOMEM);
668 goto error;
669 }
670
671 p->parent = fctx;
672 p->avctx = copy;
673
674 if (!copy) {
675 err = AVERROR(ENOMEM);
676 goto error;
677 }
678
679 *copy = *src;
680
681 copy->internal = av_malloc(sizeof(AVCodecInternal));
682 if (!copy->internal) {
683 copy->priv_data = NULL;
684 err = AVERROR(ENOMEM);
685 goto error;
686 }
687 *copy->internal = *src->internal;
688 copy->internal->thread_ctx = p;
689 copy->internal->pkt = &p->avpkt;
690
691 if (!i) {
692 src = copy;
693
694 if (codec->init)
695 err = codec->init(copy);
696
697 update_context_from_thread(avctx, copy, 1);
698 } else {
699 copy->priv_data = av_malloc(codec->priv_data_size);
700 if (!copy->priv_data) {
701 err = AVERROR(ENOMEM);
702 goto error;
703 }
704 memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
705 copy->internal->is_copy = 1;
706
707 if (codec->init_thread_copy)
708 err = codec->init_thread_copy(copy);
709 }
710
711 if (err) goto error;
712
713 err = AVERROR(pthread_create(&p->thread, NULL, frame_worker_thread, p));
714 p->thread_init= !err;
715 if(!p->thread_init)
716 goto error;
717 }
718
719 return 0;
720
721 error:
722 ff_frame_thread_free(avctx, i+1);
723
724 return err;
725 }
726
ff_thread_flush(AVCodecContext * avctx)727 void ff_thread_flush(AVCodecContext *avctx)
728 {
729 int i;
730 FrameThreadContext *fctx = avctx->internal->thread_ctx;
731
732 if (!fctx) return;
733
734 park_frame_worker_threads(fctx, avctx->thread_count);
735 if (fctx->prev_thread) {
736 if (fctx->prev_thread != &fctx->threads[0])
737 update_context_from_thread(fctx->threads[0].avctx, fctx->prev_thread->avctx, 0);
738 }
739
740 fctx->next_decoding = fctx->next_finished = 0;
741 fctx->delaying = 1;
742 fctx->prev_thread = NULL;
743 for (i = 0; i < avctx->thread_count; i++) {
744 PerThreadContext *p = &fctx->threads[i];
745 // Make sure decode flush calls with size=0 won't return old frames
746 p->got_frame = 0;
747 av_frame_unref(p->frame);
748
749 release_delayed_buffers(p);
750
751 if (avctx->codec->flush)
752 avctx->codec->flush(p->avctx);
753 }
754 }
755
ff_thread_can_start_frame(AVCodecContext * avctx)756 int ff_thread_can_start_frame(AVCodecContext *avctx)
757 {
758 PerThreadContext *p = avctx->internal->thread_ctx;
759 if ((avctx->active_thread_type&FF_THREAD_FRAME) && p->state != STATE_SETTING_UP &&
760 (avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {
761 return 0;
762 }
763 return 1;
764 }
765
thread_get_buffer_internal(AVCodecContext * avctx,ThreadFrame * f,int flags)766 static int thread_get_buffer_internal(AVCodecContext *avctx, ThreadFrame *f, int flags)
767 {
768 PerThreadContext *p = avctx->internal->thread_ctx;
769 int err;
770
771 f->owner = avctx;
772
773 ff_init_buffer_info(avctx, f->f);
774
775 if (!(avctx->active_thread_type & FF_THREAD_FRAME))
776 return ff_get_buffer(avctx, f->f, flags);
777
778 if (p->state != STATE_SETTING_UP &&
779 (avctx->codec->update_thread_context || !THREAD_SAFE_CALLBACKS(avctx))) {
780 av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
781 return -1;
782 }
783
784 if (avctx->internal->allocate_progress) {
785 int *progress;
786 f->progress = av_buffer_alloc(2 * sizeof(int));
787 if (!f->progress) {
788 return AVERROR(ENOMEM);
789 }
790 progress = (int*)f->progress->data;
791
792 progress[0] = progress[1] = -1;
793 }
794
795 pthread_mutex_lock(&p->parent->buffer_mutex);
796 if (avctx->thread_safe_callbacks ||
797 avctx->get_buffer2 == avcodec_default_get_buffer2) {
798 err = ff_get_buffer(avctx, f->f, flags);
799 } else {
800 pthread_mutex_lock(&p->progress_mutex);
801 p->requested_frame = f->f;
802 p->requested_flags = flags;
803 p->state = STATE_GET_BUFFER;
804 pthread_cond_broadcast(&p->progress_cond);
805
806 while (p->state != STATE_SETTING_UP)
807 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
808
809 err = p->result;
810
811 pthread_mutex_unlock(&p->progress_mutex);
812
813 }
814 if (!THREAD_SAFE_CALLBACKS(avctx) && !avctx->codec->update_thread_context)
815 ff_thread_finish_setup(avctx);
816 if (err)
817 av_buffer_unref(&f->progress);
818
819 pthread_mutex_unlock(&p->parent->buffer_mutex);
820
821 return err;
822 }
823
ff_thread_get_format(AVCodecContext * avctx,const enum AVPixelFormat * fmt)824 enum AVPixelFormat ff_thread_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
825 {
826 enum AVPixelFormat res;
827 PerThreadContext *p = avctx->internal->thread_ctx;
828 if (!(avctx->active_thread_type & FF_THREAD_FRAME) || avctx->thread_safe_callbacks ||
829 avctx->get_format == avcodec_default_get_format)
830 return ff_get_format(avctx, fmt);
831 if (p->state != STATE_SETTING_UP) {
832 av_log(avctx, AV_LOG_ERROR, "get_format() cannot be called after ff_thread_finish_setup()\n");
833 return -1;
834 }
835 pthread_mutex_lock(&p->progress_mutex);
836 p->available_formats = fmt;
837 p->state = STATE_GET_FORMAT;
838 pthread_cond_broadcast(&p->progress_cond);
839
840 while (p->state != STATE_SETTING_UP)
841 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
842
843 res = p->result_format;
844
845 pthread_mutex_unlock(&p->progress_mutex);
846
847 return res;
848 }
849
ff_thread_get_buffer(AVCodecContext * avctx,ThreadFrame * f,int flags)850 int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
851 {
852 int ret = thread_get_buffer_internal(avctx, f, flags);
853 if (ret < 0)
854 av_log(avctx, AV_LOG_ERROR, "thread_get_buffer() failed\n");
855 return ret;
856 }
857
ff_thread_release_buffer(AVCodecContext * avctx,ThreadFrame * f)858 void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
859 {
860 PerThreadContext *p = avctx->internal->thread_ctx;
861 FrameThreadContext *fctx;
862 AVFrame *dst, *tmp;
863 int can_direct_free = !(avctx->active_thread_type & FF_THREAD_FRAME) ||
864 avctx->thread_safe_callbacks ||
865 avctx->get_buffer2 == avcodec_default_get_buffer2;
866
867 if (!f->f || !f->f->buf[0])
868 return;
869
870 if (avctx->debug & FF_DEBUG_BUFFERS)
871 av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p\n", f);
872
873 av_buffer_unref(&f->progress);
874 f->owner = NULL;
875
876 if (can_direct_free) {
877 av_frame_unref(f->f);
878 return;
879 }
880
881 fctx = p->parent;
882 pthread_mutex_lock(&fctx->buffer_mutex);
883
884 if (p->num_released_buffers + 1 >= INT_MAX / sizeof(*p->released_buffers))
885 goto fail;
886 tmp = av_fast_realloc(p->released_buffers, &p->released_buffers_allocated,
887 (p->num_released_buffers + 1) *
888 sizeof(*p->released_buffers));
889 if (!tmp)
890 goto fail;
891 p->released_buffers = tmp;
892
893 dst = &p->released_buffers[p->num_released_buffers];
894 av_frame_move_ref(dst, f->f);
895
896 p->num_released_buffers++;
897
898 fail:
899 pthread_mutex_unlock(&fctx->buffer_mutex);
900 }
901