FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/pthread_frame.c
Date: 2025-10-10 03:51:19
Exec Total Coverage
Lines: 418 538 77.7%
Functions: 26 28 92.9%
Branches: 186 312 59.6%
Line Branch Exec Source
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 <stdatomic.h>
26
27 #include "avcodec.h"
28 #include "avcodec_internal.h"
29 #include "codec_desc.h"
30 #include "codec_internal.h"
31 #include "decode.h"
32 #include "hwaccel_internal.h"
33 #include "hwconfig.h"
34 #include "internal.h"
35 #include "packet_internal.h"
36 #include "pthread_internal.h"
37 #include "libavutil/refstruct.h"
38 #include "thread.h"
39 #include "threadframe.h"
40 #include "version_major.h"
41
42 #include "libavutil/avassert.h"
43 #include "libavutil/buffer.h"
44 #include "libavutil/common.h"
45 #include "libavutil/cpu.h"
46 #include "libavutil/frame.h"
47 #include "libavutil/internal.h"
48 #include "libavutil/log.h"
49 #include "libavutil/mem.h"
50 #include "libavutil/opt.h"
51 #include "libavutil/thread.h"
52
53 enum {
54 /// Set when the thread is awaiting a packet.
55 STATE_INPUT_READY,
56 /// Set before the codec has called ff_thread_finish_setup().
57 STATE_SETTING_UP,
58 /// Set after the codec has called ff_thread_finish_setup().
59 STATE_SETUP_FINISHED,
60 };
61
62 enum {
63 UNINITIALIZED, ///< Thread has not been created, AVCodec->close mustn't be called
64 NEEDS_CLOSE, ///< FFCodec->close needs to be called
65 INITIALIZED, ///< Thread has been properly set up
66 };
67
68 typedef struct DecodedFrames {
69 AVFrame **f;
70 size_t nb_f;
71 size_t nb_f_allocated;
72 } DecodedFrames;
73
74 typedef struct ThreadFrameProgress {
75 atomic_int progress[2];
76 } ThreadFrameProgress;
77
78 /**
79 * Context used by codec threads and stored in their AVCodecInternal thread_ctx.
80 */
81 typedef struct PerThreadContext {
82 struct FrameThreadContext *parent;
83
84 pthread_t thread;
85 int thread_init;
86 unsigned pthread_init_cnt;///< Number of successfully initialized mutexes/conditions
87 pthread_cond_t input_cond; ///< Used to wait for a new packet from the main thread.
88 pthread_cond_t progress_cond; ///< Used by child threads to wait for progress to change.
89 pthread_cond_t output_cond; ///< Used by the main thread to wait for frames to finish.
90
91 pthread_mutex_t mutex; ///< Mutex used to protect the contents of the PerThreadContext.
92 pthread_mutex_t progress_mutex; ///< Mutex used to protect frame progress values and progress_cond.
93
94 AVCodecContext *avctx; ///< Context used to decode packets passed to this thread.
95
96 AVPacket *avpkt; ///< Input packet (for decoding) or output (for encoding).
97
98 /**
99 * Decoded frames from a single decode iteration.
100 */
101 DecodedFrames df;
102 int result; ///< The result of the last codec decode/encode() call.
103
104 atomic_int state;
105
106 int die; ///< Set when the thread should exit.
107
108 int hwaccel_serializing;
109 int async_serializing;
110
111 // set to 1 in ff_thread_finish_setup() when a threadsafe hwaccel is used;
112 // cannot check hwaccel caps directly, because
113 // worked threads clear hwaccel state for thread-unsafe hwaccels
114 // after each decode call
115 int hwaccel_threadsafe;
116
117 atomic_int debug_threads; ///< Set if the FF_DEBUG_THREADS option is set.
118 } PerThreadContext;
119
120 /**
121 * Context stored in the client AVCodecInternal thread_ctx.
122 */
123 typedef struct FrameThreadContext {
124 PerThreadContext *threads; ///< The contexts for each thread.
125 PerThreadContext *prev_thread; ///< The last thread submit_packet() was called on.
126
127 unsigned pthread_init_cnt; ///< Number of successfully initialized mutexes/conditions
128 pthread_mutex_t buffer_mutex; ///< Mutex used to protect get/release_buffer().
129 /**
130 * This lock is used for ensuring threads run in serial when thread-unsafe
131 * hwaccel is used.
132 */
133 pthread_mutex_t hwaccel_mutex;
134 pthread_mutex_t async_mutex;
135 pthread_cond_t async_cond;
136 int async_lock;
137
138 DecodedFrames df;
139 int result;
140
141 /**
142 * Packet to be submitted to the next thread for decoding.
143 */
144 AVPacket *next_pkt;
145
146 int next_decoding; ///< The next context to submit a packet to.
147 int next_finished; ///< The next context to return output from.
148
149 /* hwaccel state for thread-unsafe hwaccels is temporarily stored here in
150 * order to transfer its ownership to the next decoding thread without the
151 * need for extra synchronization */
152 const AVHWAccel *stash_hwaccel;
153 void *stash_hwaccel_context;
154 void *stash_hwaccel_priv;
155 } FrameThreadContext;
156
157 1818 static int hwaccel_serial(const AVCodecContext *avctx)
158 {
159
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 1818 return avctx->hwaccel && !(ffhwaccel(avctx->hwaccel)->caps_internal & HWACCEL_CAP_THREAD_SAFE);
160 }
161
162 842 static void async_lock(FrameThreadContext *fctx)
163 {
164 842 pthread_mutex_lock(&fctx->async_mutex);
165
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 842 while (fctx->async_lock)
166 ✗ pthread_cond_wait(&fctx->async_cond, &fctx->async_mutex);
167 842 fctx->async_lock = 1;
168 842 pthread_mutex_unlock(&fctx->async_mutex);
169 842 }
170
171 842 static void async_unlock(FrameThreadContext *fctx)
172 {
173 842 pthread_mutex_lock(&fctx->async_mutex);
174
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 842 av_assert0(fctx->async_lock);
175 842 fctx->async_lock = 0;
176 842 pthread_cond_broadcast(&fctx->async_cond);
177 842 pthread_mutex_unlock(&fctx->async_mutex);
178 842 }
179
180 76 static void thread_set_name(PerThreadContext *p)
181 {
182 76 AVCodecContext *avctx = p->avctx;
183 76 int idx = p - p->parent->threads;
184 char name[16];
185
186 76 snprintf(name, sizeof(name), "av:%.7s:df%d", avctx->codec->name, idx);
187
188 76 ff_thread_setname(name);
189 76 }
190
191 // get a free frame to decode into
192 1144 static AVFrame *decoded_frames_get_free(DecodedFrames *df)
193 {
194
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 1144 if (df->nb_f == df->nb_f_allocated) {
195 163 AVFrame **tmp = av_realloc_array(df->f, df->nb_f + 1,
196 sizeof(*df->f));
197
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 163 if (!tmp)
198 ✗ return NULL;
199 163 df->f = tmp;
200
201 163 df->f[df->nb_f] = av_frame_alloc();
202
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 163 if (!df->f[df->nb_f])
203 ✗ return NULL;
204
205 163 df->nb_f_allocated++;
206 }
207
208
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 1144 av_assert0(!df->f[df->nb_f]->buf[0]);
209
210 1144 return df->f[df->nb_f];
211 }
212
213 537 static void decoded_frames_pop(DecodedFrames *df, AVFrame *dst)
214 {
215 537 AVFrame *tmp_frame = df->f[0];
216 537 av_frame_move_ref(dst, tmp_frame);
217 537 memmove(df->f, df->f + 1, (df->nb_f - 1) * sizeof(*df->f));
218 537 df->f[--df->nb_f] = tmp_frame;
219 537 }
220
221 ✗ static void decoded_frames_flush(DecodedFrames *df)
222 {
223 ✗ for (size_t i = 0; i < df->nb_f; i++)
224 ✗ av_frame_unref(df->f[i]);
225 ✗ df->nb_f = 0;
226 ✗ }
227
228 86 static void decoded_frames_free(DecodedFrames *df)
229 {
230
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 249 for (size_t i = 0; i < df->nb_f_allocated; i++)
231 163 av_frame_free(&df->f[i]);
232 86 av_freep(&df->f);
233 86 df->nb_f = 0;
234 86 df->nb_f_allocated = 0;
235 86 }
236
237 /**
238 * Codec worker thread.
239 *
240 * Automatically calls ff_thread_finish_setup() if the codec does
241 * not provide an update_thread_context method, or if the codec returns
242 * before calling it.
243 */
244 76 static attribute_align_arg void *frame_worker_thread(void *arg)
245 {
246 76 PerThreadContext *p = arg;
247 76 AVCodecContext *avctx = p->avctx;
248 76 const FFCodec *codec = ffcodec(avctx->codec);
249
250 76 thread_set_name(p);
251
252 76 pthread_mutex_lock(&p->mutex);
253 606 while (1) {
254 int ret;
255
256
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 1357 while (atomic_load(&p->state) == STATE_INPUT_READY && !p->die)
257 675 pthread_cond_wait(&p->input_cond, &p->mutex);
258
259
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 682 if (p->die) break;
260
261
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 606 if (!codec->update_thread_context)
262 494 ff_thread_finish_setup(avctx);
263
264 /* If a decoder supports hwaccel, then it must call ff_get_format().
265 * Since that call must happen before ff_thread_finish_setup(), the
266 * decoder is required to implement update_thread_context() and call
267 * ff_thread_finish_setup() manually. Therefore the above
268 * ff_thread_finish_setup() call did not happen and hwaccel_serializing
269 * cannot be true here. */
270
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 606 av_assert0(!p->hwaccel_serializing);
271
272 /* if the previous thread uses thread-unsafe hwaccel then we take the
273 * lock to ensure the threads don't run concurrently */
274
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 606 if (hwaccel_serial(avctx)) {
275 ✗ pthread_mutex_lock(&p->parent->hwaccel_mutex);
276 ✗ p->hwaccel_serializing = 1;
277 }
278
279 606 ret = 0;
280
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 1750 while (ret >= 0) {
281 AVFrame *frame;
282
283 /* get the frame which will store the output */
284 1144 frame = decoded_frames_get_free(&p->df);
285
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 1144 if (!frame) {
286 ✗ p->result = AVERROR(ENOMEM);
287 ✗ goto alloc_fail;
288 }
289
290 /* do the actual decoding */
291 1144 ret = ff_decode_receive_frame_internal(avctx, frame);
292
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 1144 if (ret == 0)
293 538 p->df.nb_f++;
294
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 606 else if (ret < 0 && frame->buf[0])
295 ✗ av_frame_unref(frame);
296
297
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 1144 p->result = (ret == AVERROR(EAGAIN)) ? 0 : ret;
298 }
299
300
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 606 if (atomic_load(&p->state) == STATE_SETTING_UP)
301 28 ff_thread_finish_setup(avctx);
302
303 578 alloc_fail:
304
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 606 if (p->hwaccel_serializing) {
305 /* wipe hwaccel state for thread-unsafe hwaccels to avoid stale
306 * pointers lying around;
307 * the state was transferred to FrameThreadContext in
308 * ff_thread_finish_setup(), so nothing is leaked */
309 ✗ avctx->hwaccel = NULL;
310 ✗ avctx->hwaccel_context = NULL;
311 ✗ avctx->internal->hwaccel_priv_data = NULL;
312
313 ✗ p->hwaccel_serializing = 0;
314 ✗ pthread_mutex_unlock(&p->parent->hwaccel_mutex);
315 }
316
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 606 av_assert0(!avctx->hwaccel ||
317 (ffhwaccel(avctx->hwaccel)->caps_internal & HWACCEL_CAP_THREAD_SAFE));
318
319
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 606 if (p->async_serializing) {
320 ✗ p->async_serializing = 0;
321
322 ✗ async_unlock(p->parent);
323 }
324
325 606 pthread_mutex_lock(&p->progress_mutex);
326
327 606 atomic_store(&p->state, STATE_INPUT_READY);
328
329 606 pthread_cond_broadcast(&p->progress_cond);
330 606 pthread_cond_signal(&p->output_cond);
331 606 pthread_mutex_unlock(&p->progress_mutex);
332 }
333 76 pthread_mutex_unlock(&p->mutex);
334
335 76 return NULL;
336 }
337
338 /**
339 * Update the next thread's AVCodecContext with values from the reference thread's context.
340 *
341 * @param dst The destination context.
342 * @param src The source context.
343 * @param for_user 0 if the destination is a codec thread, 1 if the destination is the user's thread
344 * @return 0 on success, negative error code on failure
345 */
346 1111 static int update_context_from_thread(AVCodecContext *dst, const AVCodecContext *src, int for_user)
347 {
348 1111 const FFCodec *const codec = ffcodec(dst->codec);
349 1111 int err = 0;
350
351
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 1111 if (dst != src && (for_user || codec->update_thread_context)) {
352 664 dst->time_base = src->time_base;
353 664 dst->framerate = src->framerate;
354 664 dst->width = src->width;
355 664 dst->height = src->height;
356 664 dst->pix_fmt = src->pix_fmt;
357 664 dst->sw_pix_fmt = src->sw_pix_fmt;
358
359 664 dst->coded_width = src->coded_width;
360 664 dst->coded_height = src->coded_height;
361
362 664 dst->has_b_frames = src->has_b_frames;
363 664 dst->idct_algo = src->idct_algo;
364 #if FF_API_CODEC_PROPS
365 FF_DISABLE_DEPRECATION_WARNINGS
366 664 dst->properties = src->properties;
367 FF_ENABLE_DEPRECATION_WARNINGS
368 #endif
369
370 664 dst->bits_per_coded_sample = src->bits_per_coded_sample;
371 664 dst->sample_aspect_ratio = src->sample_aspect_ratio;
372
373 664 dst->profile = src->profile;
374 664 dst->level = src->level;
375
376 664 dst->bits_per_raw_sample = src->bits_per_raw_sample;
377 664 dst->color_primaries = src->color_primaries;
378
379 664 dst->color_trc = src->color_trc;
380 664 dst->colorspace = src->colorspace;
381 664 dst->color_range = src->color_range;
382 664 dst->chroma_sample_location = src->chroma_sample_location;
383
384 664 dst->sample_rate = src->sample_rate;
385 664 dst->sample_fmt = src->sample_fmt;
386 664 err = av_channel_layout_copy(&dst->ch_layout, &src->ch_layout);
387
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 664 if (err < 0)
388 ✗ return err;
389
390
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 664 if (!!dst->hw_frames_ctx != !!src->hw_frames_ctx ||
391
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 664 (dst->hw_frames_ctx && dst->hw_frames_ctx->data != src->hw_frames_ctx->data)) {
392 ✗ av_buffer_unref(&dst->hw_frames_ctx);
393
394 ✗ if (src->hw_frames_ctx) {
395 ✗ dst->hw_frames_ctx = av_buffer_ref(src->hw_frames_ctx);
396 ✗ if (!dst->hw_frames_ctx)
397 ✗ return AVERROR(ENOMEM);
398 }
399 }
400
401 664 dst->hwaccel_flags = src->hwaccel_flags;
402
403 664 av_refstruct_replace(&dst->internal->pool, src->internal->pool);
404 664 ff_decode_internal_sync(dst, src);
405 }
406
407
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 1111 if (for_user) {
408
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 556 if (codec->update_thread_context_for_user)
409 58 err = codec->update_thread_context_for_user(dst, src);
410 } else {
411 555 const PerThreadContext *p_src = src->internal->thread_ctx;
412 555 PerThreadContext *p_dst = dst->internal->thread_ctx;
413
414
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 555 if (codec->update_thread_context) {
415 108 err = codec->update_thread_context(dst, src);
416
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 108 if (err < 0)
417 ✗ return err;
418 }
419
420 // reset dst hwaccel state if needed
421
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 555 av_assert0(p_dst->hwaccel_threadsafe ||
422 (!dst->hwaccel && !dst->internal->hwaccel_priv_data));
423
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 555 if (p_dst->hwaccel_threadsafe &&
424 ✗ (!p_src->hwaccel_threadsafe || dst->hwaccel != src->hwaccel)) {
425 ✗ ff_hwaccel_uninit(dst);
426 ✗ p_dst->hwaccel_threadsafe = 0;
427 }
428
429 // propagate hwaccel state for threadsafe hwaccels
430
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 555 if (p_src->hwaccel_threadsafe) {
431 ✗ const FFHWAccel *hwaccel = ffhwaccel(src->hwaccel);
432 ✗ if (!dst->hwaccel) {
433 ✗ if (hwaccel->priv_data_size) {
434 ✗ av_assert0(hwaccel->update_thread_context);
435
436 ✗ dst->internal->hwaccel_priv_data =
437 ✗ av_mallocz(hwaccel->priv_data_size);
438 ✗ if (!dst->internal->hwaccel_priv_data)
439 ✗ return AVERROR(ENOMEM);
440 }
441 ✗ dst->hwaccel = src->hwaccel;
442 }
443 ✗ av_assert0(dst->hwaccel == src->hwaccel);
444
445 ✗ if (hwaccel->update_thread_context) {
446 ✗ err = hwaccel->update_thread_context(dst, src);
447 ✗ if (err < 0) {
448 ✗ av_log(dst, AV_LOG_ERROR, "Error propagating hwaccel state\n");
449 ✗ ff_hwaccel_uninit(dst);
450 ✗ return err;
451 }
452 }
453 ✗ p_dst->hwaccel_threadsafe = 1;
454 }
455 }
456
457 1111 return err;
458 }
459
460 /**
461 * Update the next thread's AVCodecContext with values set by the user.
462 *
463 * @param dst The destination context.
464 * @param src The source context.
465 * @return 0 on success, negative error code on failure
466 */
467 606 static int update_context_from_user(AVCodecContext *dst, const AVCodecContext *src)
468 {
469 int err;
470
471 606 dst->flags = src->flags;
472
473 606 dst->draw_horiz_band= src->draw_horiz_band;
474 606 dst->get_buffer2 = src->get_buffer2;
475
476 606 dst->opaque = src->opaque;
477 606 dst->debug = src->debug;
478
479 606 dst->slice_flags = src->slice_flags;
480 606 dst->flags2 = src->flags2;
481 606 dst->export_side_data = src->export_side_data;
482
483 606 dst->skip_loop_filter = src->skip_loop_filter;
484 606 dst->skip_idct = src->skip_idct;
485 606 dst->skip_frame = src->skip_frame;
486
487 606 dst->frame_num = src->frame_num;
488
489 606 av_packet_unref(dst->internal->last_pkt_props);
490 606 err = av_packet_copy_props(dst->internal->last_pkt_props, src->internal->last_pkt_props);
491
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 606 if (err < 0)
492 ✗ return err;
493
494 606 return 0;
495 }
496
497 606 static int submit_packet(PerThreadContext *p, AVCodecContext *user_avctx,
498 AVPacket *in_pkt)
499 {
500 606 FrameThreadContext *fctx = p->parent;
501 606 PerThreadContext *prev_thread = fctx->prev_thread;
502 606 const AVCodec *codec = p->avctx->codec;
503 int ret;
504
505 606 pthread_mutex_lock(&p->mutex);
506
507 606 av_packet_unref(p->avpkt);
508 606 av_packet_move_ref(p->avpkt, in_pkt);
509
510
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 606 if (AVPACKET_IS_EMPTY(p->avpkt))
511 68 p->avctx->internal->draining = 1;
512
513 606 ret = update_context_from_user(p->avctx, user_avctx);
514
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 606 if (ret) {
515 ✗ pthread_mutex_unlock(&p->mutex);
516 ✗ return ret;
517 }
518 606 atomic_store_explicit(&p->debug_threads,
519 (p->avctx->debug & FF_DEBUG_THREADS) != 0,
520 memory_order_relaxed);
521
522
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 606 if (prev_thread) {
523
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 596 if (atomic_load(&prev_thread->state) == STATE_SETTING_UP) {
524 322 pthread_mutex_lock(&prev_thread->progress_mutex);
525
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 644 while (atomic_load(&prev_thread->state) == STATE_SETTING_UP)
526 322 pthread_cond_wait(&prev_thread->progress_cond, &prev_thread->progress_mutex);
527 322 pthread_mutex_unlock(&prev_thread->progress_mutex);
528 }
529
530 /* codecs without delay might not be prepared to be called repeatedly here during
531 * flushing (vp3/theora), and also don't need to be, since from this point on, they
532 * will always return EOF anyway */
533
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 596 if (!p->avctx->internal->draining ||
534
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 68 (codec->capabilities & AV_CODEC_CAP_DELAY)) {
535 555 ret = update_context_from_thread(p->avctx, prev_thread->avctx, 0);
536
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 555 if (ret) {
537 ✗ pthread_mutex_unlock(&p->mutex);
538 ✗ return ret;
539 }
540 }
541 }
542
543 /* transfer the stashed hwaccel state, if any */
544
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 606 av_assert0(!p->avctx->hwaccel || p->hwaccel_threadsafe);
545
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 606 if (!p->hwaccel_threadsafe) {
546 606 FFSWAP(const AVHWAccel*, p->avctx->hwaccel, fctx->stash_hwaccel);
547 606 FFSWAP(void*, p->avctx->hwaccel_context, fctx->stash_hwaccel_context);
548 606 FFSWAP(void*, p->avctx->internal->hwaccel_priv_data, fctx->stash_hwaccel_priv);
549 }
550
551 606 atomic_store(&p->state, STATE_SETTING_UP);
552 606 pthread_cond_signal(&p->input_cond);
553 606 pthread_mutex_unlock(&p->mutex);
554
555 606 fctx->prev_thread = p;
556 606 fctx->next_decoding = (fctx->next_decoding + 1) % p->avctx->thread_count;
557
558 606 return 0;
559 }
560
561 832 int ff_thread_receive_frame(AVCodecContext *avctx, AVFrame *frame)
562 {
563 832 FrameThreadContext *fctx = avctx->internal->thread_ctx;
564 832 int ret = 0;
565
566 /* release the async lock, permitting blocked hwaccel threads to
567 * go forward while we are in this function */
568 832 async_unlock(fctx);
569
570 /* submit packets to threads while there are no buffered results to return */
571
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 1438 while (!fctx->df.nb_f && !fctx->result) {
572 PerThreadContext *p;
573
574 /* get a packet to be submitted to the next thread */
575 892 av_packet_unref(fctx->next_pkt);
576 892 ret = ff_decode_get_packet(avctx, fctx->next_pkt);
577
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 892 if (ret < 0 && ret != AVERROR_EOF)
578 286 goto finish;
579
580 606 ret = submit_packet(&fctx->threads[fctx->next_decoding], avctx,
581 fctx->next_pkt);
582
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 606 if (ret < 0)
583 ✗ goto finish;
584
585 /* do not return any frames until all threads have something to do */
586
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 606 if (fctx->next_decoding != fctx->next_finished &&
587
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 72 !avctx->internal->draining)
588 60 continue;
589
590 546 p = &fctx->threads[fctx->next_finished];
591 546 fctx->next_finished = (fctx->next_finished + 1) % avctx->thread_count;
592
593
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 546 if (atomic_load(&p->state) != STATE_INPUT_READY) {
594 141 pthread_mutex_lock(&p->progress_mutex);
595
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 281 while (atomic_load_explicit(&p->state, memory_order_relaxed) != STATE_INPUT_READY)
596 140 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
597 141 pthread_mutex_unlock(&p->progress_mutex);
598 }
599
600 546 update_context_from_thread(avctx, p->avctx, 1);
601 546 fctx->result = p->result;
602 546 p->result = 0;
603
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 546 if (p->df.nb_f)
604 535 FFSWAP(DecodedFrames, fctx->df, p->df);
605 }
606
607 /* a thread may return multiple frames AND an error
608 * we first return all the frames, then the error */
609
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 546 if (fctx->df.nb_f) {
610 537 decoded_frames_pop(&fctx->df, frame);
611 537 ret = 0;
612 } else {
613 9 ret = fctx->result;
614 9 fctx->result = 0;
615 }
616
617 832 finish:
618 832 async_lock(fctx);
619 832 return ret;
620 }
621
622 287215 void ff_thread_report_progress(ThreadFrame *f, int n, int field)
623 {
624 PerThreadContext *p;
625
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 287215 atomic_int *progress = f->progress ? f->progress->progress : NULL;
626
627
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 287215 if (!progress ||
628
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 1240 atomic_load_explicit(&progress[field], memory_order_relaxed) >= n)
629 286002 return;
630
631 1213 p = f->owner[field]->internal->thread_ctx;
632
633
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 1213 if (atomic_load_explicit(&p->debug_threads, memory_order_relaxed))
634 ✗ av_log(f->owner[field], AV_LOG_DEBUG,
635 "%p finished %d field %d\n", progress, n, field);
636
637 1213 pthread_mutex_lock(&p->progress_mutex);
638
639 1213 atomic_store_explicit(&progress[field], n, memory_order_release);
640
641 1213 pthread_cond_broadcast(&p->progress_cond);
642 1213 pthread_mutex_unlock(&p->progress_mutex);
643 }
644
645 150874 void ff_thread_await_progress(const ThreadFrame *f, int n, int field)
646 {
647 PerThreadContext *p;
648
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 150874 atomic_int *progress = f->progress ? f->progress->progress : NULL;
649
650
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 150874 if (!progress ||
651
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 150193 atomic_load_explicit(&progress[field], memory_order_acquire) >= n)
652 150314 return;
653
654 560 p = f->owner[field]->internal->thread_ctx;
655
656
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 560 if (atomic_load_explicit(&p->debug_threads, memory_order_relaxed))
657 ✗ av_log(f->owner[field], AV_LOG_DEBUG,
658 "thread awaiting %d field %d from %p\n", n, field, progress);
659
660 560 pthread_mutex_lock(&p->progress_mutex);
661
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 1123 while (atomic_load_explicit(&progress[field], memory_order_relaxed) < n)
662 563 pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
663 560 pthread_mutex_unlock(&p->progress_mutex);
664 }
665
666 24053 void ff_thread_finish_setup(AVCodecContext *avctx) {
667 PerThreadContext *p;
668
669
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 24053 if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
670
671 606 p = avctx->internal->thread_ctx;
672
673
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 606 p->hwaccel_threadsafe = avctx->hwaccel &&
674 ✗ (ffhwaccel(avctx->hwaccel)->caps_internal & HWACCEL_CAP_THREAD_SAFE);
675
676
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 606 if (hwaccel_serial(avctx) && !p->hwaccel_serializing) {
677 ✗ pthread_mutex_lock(&p->parent->hwaccel_mutex);
678 ✗ p->hwaccel_serializing = 1;
679 }
680
681 /* this assumes that no hwaccel calls happen before ff_thread_finish_setup() */
682
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 606 if (avctx->hwaccel &&
683 ✗ !(ffhwaccel(avctx->hwaccel)->caps_internal & HWACCEL_CAP_ASYNC_SAFE)) {
684 ✗ p->async_serializing = 1;
685
686 ✗ async_lock(p->parent);
687 }
688
689 /* thread-unsafe hwaccels share a single private data instance, so we
690 * save hwaccel state for passing to the next thread;
691 * this is done here so that this worker thread can wipe its own hwaccel
692 * state after decoding, without requiring synchronization */
693
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 606 av_assert0(!p->parent->stash_hwaccel);
694
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 606 if (hwaccel_serial(avctx)) {
695 ✗ p->parent->stash_hwaccel = avctx->hwaccel;
696 ✗ p->parent->stash_hwaccel_context = avctx->hwaccel_context;
697 ✗ p->parent->stash_hwaccel_priv = avctx->internal->hwaccel_priv_data;
698 }
699
700 606 pthread_mutex_lock(&p->progress_mutex);
701
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 606 if(atomic_load(&p->state) == STATE_SETUP_FINISHED){
702 ✗ av_log(avctx, AV_LOG_WARNING, "Multiple ff_thread_finish_setup() calls\n");
703 }
704
705 606 atomic_store(&p->state, STATE_SETUP_FINISHED);
706
707 606 pthread_cond_broadcast(&p->progress_cond);
708 606 pthread_mutex_unlock(&p->progress_mutex);
709 }
710
711 /// Waits for all threads to finish.
712 10 static av_cold void park_frame_worker_threads(FrameThreadContext *fctx, int thread_count)
713 {
714 int i;
715
716 10 async_unlock(fctx);
717
718
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 86 for (i = 0; i < thread_count; i++) {
719 76 PerThreadContext *p = &fctx->threads[i];
720
721
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 76 if (atomic_load(&p->state) != STATE_INPUT_READY) {
722 8 pthread_mutex_lock(&p->progress_mutex);
723
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 16 while (atomic_load(&p->state) != STATE_INPUT_READY)
724 8 pthread_cond_wait(&p->output_cond, &p->progress_mutex);
725 8 pthread_mutex_unlock(&p->progress_mutex);
726 }
727 }
728
729 10 async_lock(fctx);
730 10 }
731
732 #define OFF(member) offsetof(FrameThreadContext, member)
733 DEFINE_OFFSET_ARRAY(FrameThreadContext, thread_ctx, pthread_init_cnt,
734 (OFF(buffer_mutex), OFF(hwaccel_mutex), OFF(async_mutex)),
735 (OFF(async_cond)));
736 #undef OFF
737
738 #define OFF(member) offsetof(PerThreadContext, member)
739 DEFINE_OFFSET_ARRAY(PerThreadContext, per_thread, pthread_init_cnt,
740 (OFF(progress_mutex), OFF(mutex)),
741 (OFF(input_cond), OFF(progress_cond), OFF(output_cond)));
742 #undef OFF
743
744 10 av_cold void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
745 {
746 10 FrameThreadContext *fctx = avctx->internal->thread_ctx;
747 10 const FFCodec *codec = ffcodec(avctx->codec);
748 int i;
749
750 10 park_frame_worker_threads(fctx, thread_count);
751
752
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 86 for (i = 0; i < thread_count; i++) {
753 76 PerThreadContext *p = &fctx->threads[i];
754 76 AVCodecContext *ctx = p->avctx;
755
756
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 76 if (ctx->internal) {
757
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 76 if (p->thread_init == INITIALIZED) {
758 76 pthread_mutex_lock(&p->mutex);
759 76 p->die = 1;
760 76 pthread_cond_signal(&p->input_cond);
761 76 pthread_mutex_unlock(&p->mutex);
762
763 76 pthread_join(p->thread, NULL);
764 }
765
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 76 if (codec->close && p->thread_init != UNINITIALIZED)
766 76 codec->close(ctx);
767
768 /* When using a threadsafe hwaccel, this is where
769 * each thread's context is uninit'd and freed. */
770 76 ff_hwaccel_uninit(ctx);
771
772
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 76 if (ctx->priv_data) {
773
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 76 if (codec->p.priv_class)
774 58 av_opt_free(ctx->priv_data);
775 76 av_freep(&ctx->priv_data);
776 }
777
778 76 av_refstruct_unref(&ctx->internal->pool);
779 76 av_packet_free(&ctx->internal->in_pkt);
780 76 av_packet_free(&ctx->internal->last_pkt_props);
781 76 ff_decode_internal_uninit(ctx);
782 76 av_freep(&ctx->internal);
783 76 av_buffer_unref(&ctx->hw_frames_ctx);
784 76 av_frame_side_data_free(&ctx->decoded_side_data,
785 &ctx->nb_decoded_side_data);
786 }
787
788 76 decoded_frames_free(&p->df);
789
790 76 ff_pthread_free(p, per_thread_offsets);
791 76 av_packet_free(&p->avpkt);
792
793 76 av_freep(&p->avctx);
794 }
795
796 10 decoded_frames_free(&fctx->df);
797 10 av_packet_free(&fctx->next_pkt);
798
799 10 av_freep(&fctx->threads);
800 10 ff_pthread_free(fctx, thread_ctx_offsets);
801
802 /* if we have stashed hwaccel state, move it to the user-facing context,
803 * so it will be freed in ff_codec_close() */
804
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 10 av_assert0(!avctx->hwaccel);
805 10 FFSWAP(const AVHWAccel*, avctx->hwaccel, fctx->stash_hwaccel);
806 10 FFSWAP(void*, avctx->hwaccel_context, fctx->stash_hwaccel_context);
807 10 FFSWAP(void*, avctx->internal->hwaccel_priv_data, fctx->stash_hwaccel_priv);
808
809 10 av_freep(&avctx->internal->thread_ctx);
810 10 }
811
812 76 static av_cold int init_thread(PerThreadContext *p, int *threads_to_free,
813 FrameThreadContext *fctx, AVCodecContext *avctx,
814 const FFCodec *codec, int first)
815 {
816 AVCodecContext *copy;
817 int err;
818
819 76 atomic_init(&p->state, STATE_INPUT_READY);
820
821 76 copy = av_memdup(avctx, sizeof(*avctx));
822
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 76 if (!copy)
823 ✗ return AVERROR(ENOMEM);
824 76 copy->priv_data = NULL;
825 76 copy->decoded_side_data = NULL;
826 76 copy->nb_decoded_side_data = 0;
827
828 /* From now on, this PerThreadContext will be cleaned up by
829 * ff_frame_thread_free in case of errors. */
830 76 (*threads_to_free)++;
831
832 76 p->parent = fctx;
833 76 p->avctx = copy;
834
835 76 copy->internal = ff_decode_internal_alloc();
836
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 76 if (!copy->internal)
837 ✗ return AVERROR(ENOMEM);
838 76 ff_decode_internal_sync(copy, avctx);
839 76 copy->internal->thread_ctx = p;
840 76 copy->internal->progress_frame_pool = avctx->internal->progress_frame_pool;
841
842 76 copy->delay = avctx->delay;
843
844
1/2
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 76 if (codec->priv_data_size) {
845 76 copy->priv_data = av_mallocz(codec->priv_data_size);
846
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 76 if (!copy->priv_data)
847 ✗ return AVERROR(ENOMEM);
848
849
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 76 if (codec->p.priv_class) {
850 58 *(const AVClass **)copy->priv_data = codec->p.priv_class;
851 58 err = av_opt_copy(copy->priv_data, avctx->priv_data);
852
1/2
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 58 if (err < 0)
853 ✗ return err;
854 }
855 }
856
857 76 err = ff_pthread_init(p, per_thread_offsets);
858
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 76 if (err < 0)
859 ✗ return err;
860
861
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 76 if (!(p->avpkt = av_packet_alloc()))
862 ✗ return AVERROR(ENOMEM);
863
864 76 copy->internal->is_frame_mt = 1;
865
2/2
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 76 if (!first)
866 66 copy->internal->is_copy = 1;
867
868 76 copy->internal->in_pkt = av_packet_alloc();
869
1/2
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 76 if (!copy->internal->in_pkt)
870 ✗ return AVERROR(ENOMEM);
871
872 76 copy->internal->last_pkt_props = av_packet_alloc();
873
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 76 if (!copy->internal->last_pkt_props)
874 ✗ return AVERROR(ENOMEM);
875
876
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✗ Branch 1 not taken.
 76 if (codec->init) {
877 76 err = codec->init(copy);
878
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 76 if (err < 0) {
879 ✗ if (codec->caps_internal & FF_CODEC_CAP_INIT_CLEANUP)
880 ✗ p->thread_init = NEEDS_CLOSE;
881 ✗ return err;
882 }
883 }
884 76 p->thread_init = NEEDS_CLOSE;
885
886
2/2
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 76 if (first) {
887 10 update_context_from_thread(avctx, copy, 1);
888
889 10 av_frame_side_data_free(&avctx->decoded_side_data, &avctx->nb_decoded_side_data);
890
1/2
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 10 for (int i = 0; i < copy->nb_decoded_side_data; i++) {
891 ✗ err = av_frame_side_data_clone(&avctx->decoded_side_data,
892 &avctx->nb_decoded_side_data,
893 ✗ copy->decoded_side_data[i], 0);
894 ✗ if (err < 0)
895 ✗ return err;
896 }
897 }
898
899 76 atomic_init(&p->debug_threads, (copy->debug & FF_DEBUG_THREADS) != 0);
900
901 76 err = AVERROR(pthread_create(&p->thread, NULL, frame_worker_thread, p));
902
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 76 if (err < 0)
903 ✗ return err;
904 76 p->thread_init = INITIALIZED;
905
906 76 return 0;
907 }
908
909 10 av_cold int ff_frame_thread_init(AVCodecContext *avctx)
910 {
911 10 int thread_count = avctx->thread_count;
912 10 const FFCodec *codec = ffcodec(avctx->codec);
913 FrameThreadContext *fctx;
914 10 int err, i = 0;
915
916
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 10 if (!thread_count) {
917 ✗ int nb_cpus = av_cpu_count();
918 // use number of cores + 1 as thread count if there is more than one
919 ✗ if (nb_cpus > 1)
920 ✗ thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
921 else
922 ✗ thread_count = avctx->thread_count = 1;
923 }
924
925
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 10 if (thread_count <= 1) {
926 ✗ avctx->active_thread_type = 0;
927 ✗ return 0;
928 }
929
930 10 avctx->internal->thread_ctx = fctx = av_mallocz(sizeof(FrameThreadContext));
931
1/2
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 10 if (!fctx)
932 ✗ return AVERROR(ENOMEM);
933
934 10 err = ff_pthread_init(fctx, thread_ctx_offsets);
935
1/2
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 10 if (err < 0) {
936 ✗ ff_pthread_free(fctx, thread_ctx_offsets);
937 ✗ av_freep(&avctx->internal->thread_ctx);
938 ✗ return err;
939 }
940
941 10 fctx->next_pkt = av_packet_alloc();
942
1/2
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 10 if (!fctx->next_pkt)
943 ✗ return AVERROR(ENOMEM);
944
945 10 fctx->async_lock = 1;
946
947
2/2
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 10 if (codec->p.type == AVMEDIA_TYPE_VIDEO)
948 6 avctx->delay = avctx->thread_count - 1;
949
950 10 fctx->threads = av_calloc(thread_count, sizeof(*fctx->threads));
951
1/2
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 10 if (!fctx->threads) {
952 ✗ err = AVERROR(ENOMEM);
953 ✗ goto error;
954 }
955
956
2/2
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 86 for (; i < thread_count; ) {
957 76 PerThreadContext *p = &fctx->threads[i];
958 76 int first = !i;
959
960 76 err = init_thread(p, &i, fctx, avctx, codec, first);
961
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 76 if (err < 0)
962 ✗ goto error;
963 }
964
965 10 return 0;
966
967 ✗ error:
968 ✗ ff_frame_thread_free(avctx, i);
969 ✗ return err;
970 }
971
972 ✗ av_cold void ff_thread_flush(AVCodecContext *avctx)
973 {
974 int i;
975 ✗ FrameThreadContext *fctx = avctx->internal->thread_ctx;
976
977 ✗ if (!fctx) return;
978
979 ✗ park_frame_worker_threads(fctx, avctx->thread_count);
980 ✗ if (fctx->prev_thread) {
981 ✗ if (fctx->prev_thread != &fctx->threads[0])
982 ✗ update_context_from_thread(fctx->threads[0].avctx, fctx->prev_thread->avctx, 0);
983 }
984
985 ✗ fctx->next_decoding = fctx->next_finished = 0;
986 ✗ fctx->prev_thread = NULL;
987
988 ✗ decoded_frames_flush(&fctx->df);
989 ✗ fctx->result = 0;
990
991 ✗ for (i = 0; i < avctx->thread_count; i++) {
992 ✗ PerThreadContext *p = &fctx->threads[i];
993
994 ✗ decoded_frames_flush(&p->df);
995 ✗ p->result = 0;
996
997 ✗ avcodec_flush_buffers(p->avctx);
998 }
999 }
1000
1001 37098 int ff_thread_can_start_frame(AVCodecContext *avctx)
1002 {
1003
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 37098 if ((avctx->active_thread_type & FF_THREAD_FRAME) &&
1004
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✗ Branch 2 not taken.
 52 ffcodec(avctx->codec)->update_thread_context) {
1005 52 PerThreadContext *p = avctx->internal->thread_ctx;
1006
1007
1/2
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 52 if (atomic_load(&p->state) != STATE_SETTING_UP)
1008 ✗ return 0;
1009 }
1010
1011 37098 return 1;
1012 }
1013
1014 53002 static int thread_get_buffer_internal(AVCodecContext *avctx, AVFrame *f, int flags)
1015 {
1016 PerThreadContext *p;
1017 int err;
1018
1019
2/2
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 53002 if (!(avctx->active_thread_type & FF_THREAD_FRAME))
1020 52464 return ff_get_buffer(avctx, f, flags);
1021
1022 538 p = avctx->internal->thread_ctx;
1023
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 538 if (atomic_load(&p->state) != STATE_SETTING_UP &&
1024
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 453 ffcodec(avctx->codec)->update_thread_context) {
1025 ✗ av_log(avctx, AV_LOG_ERROR, "get_buffer() cannot be called after ff_thread_finish_setup()\n");
1026 ✗ return -1;
1027 }
1028
1029 538 pthread_mutex_lock(&p->parent->buffer_mutex);
1030 538 err = ff_get_buffer(avctx, f, flags);
1031
1032 538 pthread_mutex_unlock(&p->parent->buffer_mutex);
1033
1034 538 return err;
1035 }
1036
1037 53002 int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f, int flags)
1038 {
1039 53002 int ret = thread_get_buffer_internal(avctx, f, flags);
1040
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 53002 if (ret < 0)
1041 ✗ av_log(avctx, AV_LOG_ERROR, "thread_get_buffer() failed\n");
1042 53002 return ret;
1043 }
1044
1045 25684 int ff_thread_get_ext_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
1046 {
1047 int ret;
1048
1049 25684 f->owner[0] = f->owner[1] = avctx;
1050
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 25684 if (!(avctx->active_thread_type & FF_THREAD_FRAME))
1051 25642 return ff_get_buffer(avctx, f->f, flags);
1052
1053 42 f->progress = av_refstruct_allocz(sizeof(*f->progress));
1054
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 42 if (!f->progress)
1055 ✗ return AVERROR(ENOMEM);
1056
1057 42 atomic_init(&f->progress->progress[0], -1);
1058 42 atomic_init(&f->progress->progress[1], -1);
1059
1060 42 ret = ff_thread_get_buffer(avctx, f->f, flags);
1061
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 42 if (ret)
1062 ✗ av_refstruct_unref(&f->progress);
1063 42 return ret;
1064 }
1065
1066 53252 void ff_thread_release_ext_buffer(ThreadFrame *f)
1067 {
1068 53252 av_refstruct_unref(&f->progress);
1069 53252 f->owner[0] = f->owner[1] = NULL;
1070
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 53252 if (f->f)
1071 53252 av_frame_unref(f->f);
1072 53252 }
1073
1074 710 av_cold enum ThreadingStatus ff_thread_sync_ref(AVCodecContext *avctx, size_t offset)
1075 {
1076 PerThreadContext *p;
1077 const void *ref;
1078
1079
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 710 if (!avctx->internal->is_copy)
1080 702 return avctx->active_thread_type & FF_THREAD_FRAME ?
1081
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 702 FF_THREAD_IS_FIRST_THREAD : FF_THREAD_NO_FRAME_THREADING;
1082
1083 8 p = avctx->internal->thread_ctx;
1084
1085 av_assert1(memcpy(&ref, (char*)avctx->priv_data + offset, sizeof(ref)) && ref == NULL);
1086
1087 8 memcpy(&ref, (const char*)p->parent->threads[0].avctx->priv_data + offset, sizeof(ref));
1088 av_assert1(ref);
1089 8 av_refstruct_replace((char*)avctx->priv_data + offset, ref);
1090
1091 8 return FF_THREAD_IS_COPY;
1092 }
1093
1094 1076 int ff_thread_get_packet(AVCodecContext *avctx, AVPacket *pkt)
1095 {
1096 1076 PerThreadContext *p = avctx->internal->thread_ctx;
1097
1098
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 1076 if (!AVPACKET_IS_EMPTY(p->avpkt)) {
1099 538 av_packet_move_ref(pkt, p->avpkt);
1100 538 return 0;
1101 }
1102
1103
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 538 return avctx->internal->draining ? AVERROR_EOF : AVERROR(EAGAIN);
1104 }
1105