GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/pthread_frame.c Lines: 352 504 69.8 %
Date: 2019-11-18 18:00:01 Branches: 175 299 58.5 %

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 "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
143
594
static void async_lock(FrameThreadContext *fctx)
144
{
145
594
    pthread_mutex_lock(&fctx->async_mutex);
146
594
    while (fctx->async_lock)
147
        pthread_cond_wait(&fctx->async_cond, &fctx->async_mutex);
148
594
    fctx->async_lock = 1;
149
594
    pthread_mutex_unlock(&fctx->async_mutex);
150
594
}
151
152
594
static void async_unlock(FrameThreadContext *fctx)
153
{
154
594
    pthread_mutex_lock(&fctx->async_mutex);
155
594
    av_assert0(fctx->async_lock);
156
594
    fctx->async_lock = 0;
157
594
    pthread_cond_broadcast(&fctx->async_cond);
158
594
    pthread_mutex_unlock(&fctx->async_mutex);
159
594
}
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
 */
168
94
static attribute_align_arg void *frame_worker_thread(void *arg)
169
{
170
94
    PerThreadContext *p = arg;
171
94
    AVCodecContext *avctx = p->avctx;
172
94
    const AVCodec *codec = avctx->codec;
173
174
94
    pthread_mutex_lock(&p->mutex);
175
    while (1) {
176

1229
        while (atomic_load(&p->state) == STATE_INPUT_READY && !p->die)
177
602
            pthread_cond_wait(&p->input_cond, &p->mutex);
178
179
627
        if (p->die) break;
180
181

533
        if (!codec->update_thread_context && THREAD_SAFE_CALLBACKS(avctx))
182
453
            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
533
        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
533
        if (avctx->hwaccel) {
195
            pthread_mutex_lock(&p->parent->hwaccel_mutex);
196
            p->hwaccel_serializing = 1;
197
        }
198
199
533
        av_frame_unref(p->frame);
200
533
        p->got_frame = 0;
201
533
        p->result = codec->decode(avctx, p->frame, &p->got_frame, &p->avpkt);
202
203

533
        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
533
        if (atomic_load(&p->state) == STATE_SETTING_UP)
211
12
            ff_thread_finish_setup(avctx);
212
213
533
        if (p->hwaccel_serializing) {
214
            p->hwaccel_serializing = 0;
215
            pthread_mutex_unlock(&p->parent->hwaccel_mutex);
216
        }
217
218
533
        if (p->async_serializing) {
219
            p->async_serializing = 0;
220
221
            async_unlock(p->parent);
222
        }
223
224
533
        pthread_mutex_lock(&p->progress_mutex);
225
226
533
        atomic_store(&p->state, STATE_INPUT_READY);
227
228
533
        pthread_cond_broadcast(&p->progress_cond);
229
533
        pthread_cond_signal(&p->output_cond);
230
533
        pthread_mutex_unlock(&p->progress_mutex);
231
    }
232
94
    pthread_mutex_unlock(&p->mutex);
233
234
94
    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
 */
245
1074
static int update_context_from_thread(AVCodecContext *dst, AVCodecContext *src, int for_user)
246
{
247
1074
    int err = 0;
248
249

1074
    if (dst != src && (for_user || !(src->codec_descriptor->props & AV_CODEC_PROP_INTRA_ONLY))) {
250
621
        dst->time_base = src->time_base;
251
621
        dst->framerate = src->framerate;
252
621
        dst->width     = src->width;
253
621
        dst->height    = src->height;
254
621
        dst->pix_fmt   = src->pix_fmt;
255
621
        dst->sw_pix_fmt = src->sw_pix_fmt;
256
257
621
        dst->coded_width  = src->coded_width;
258
621
        dst->coded_height = src->coded_height;
259
260
621
        dst->has_b_frames = src->has_b_frames;
261
621
        dst->idct_algo    = src->idct_algo;
262
263
621
        dst->bits_per_coded_sample = src->bits_per_coded_sample;
264
621
        dst->sample_aspect_ratio   = src->sample_aspect_ratio;
265
266
621
        dst->profile = src->profile;
267
621
        dst->level   = src->level;
268
269
621
        dst->bits_per_raw_sample = src->bits_per_raw_sample;
270
621
        dst->ticks_per_frame     = src->ticks_per_frame;
271
621
        dst->color_primaries     = src->color_primaries;
272
273
621
        dst->color_trc   = src->color_trc;
274
621
        dst->colorspace  = src->colorspace;
275
621
        dst->color_range = src->color_range;
276
621
        dst->chroma_sample_location = src->chroma_sample_location;
277
278
621
        dst->hwaccel = src->hwaccel;
279
621
        dst->hwaccel_context = src->hwaccel_context;
280
281
621
        dst->channels       = src->channels;
282
621
        dst->sample_rate    = src->sample_rate;
283
621
        dst->sample_fmt     = src->sample_fmt;
284
621
        dst->channel_layout = src->channel_layout;
285
621
        dst->internal->hwaccel_priv_data = src->internal->hwaccel_priv_data;
286
287
621
        if (!!dst->hw_frames_ctx != !!src->hw_frames_ctx ||
288

621
            (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
621
        dst->hwaccel_flags = src->hwaccel_flags;
299
    }
300
301
1074
    if (for_user) {
302
546
        dst->delay       = src->thread_count - 1;
303
#if FF_API_CODED_FRAME
304
FF_DISABLE_DEPRECATION_WARNINGS
305
546
        dst->coded_frame = src->coded_frame;
306
FF_ENABLE_DEPRECATION_WARNINGS
307
#endif
308
    } else {
309
528
        if (dst->codec->update_thread_context)
310
75
            err = dst->codec->update_thread_context(dst, src);
311
    }
312
313
1074
    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
 */
323
533
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
533
    dst->flags          = src->flags;
327
328
533
    dst->draw_horiz_band= src->draw_horiz_band;
329
533
    dst->get_buffer2    = src->get_buffer2;
330
331
533
    dst->opaque   = src->opaque;
332
533
    dst->debug    = src->debug;
333
533
    dst->debug_mv = src->debug_mv;
334
335
533
    dst->slice_flags = src->slice_flags;
336
533
    dst->flags2      = src->flags2;
337
338
533
    copy_fields(skip_loop_filter, subtitle_header);
339
340
533
    dst->frame_number     = src->frame_number;
341
533
    dst->reordered_opaque = src->reordered_opaque;
342
533
    dst->thread_safe_callbacks = src->thread_safe_callbacks;
343
344

533
    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
533
    dst->slice_count = src->slice_count;
355
533
    return 0;
356
#undef copy_fields
357
}
358
359
/// Releases the buffers that this decoding thread was the last user of.
360
627
static void release_delayed_buffers(PerThreadContext *p)
361
{
362
627
    FrameThreadContext *fctx = p->parent;
363
364
627
    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
627
}
379
380
582
static int submit_packet(PerThreadContext *p, AVCodecContext *user_avctx,
381
                         AVPacket *avpkt)
382
{
383
582
    FrameThreadContext *fctx = p->parent;
384
582
    PerThreadContext *prev_thread = fctx->prev_thread;
385
582
    const AVCodec *codec = p->avctx->codec;
386
    int ret;
387
388

582
    if (!avpkt->size && !(codec->capabilities & AV_CODEC_CAP_DELAY))
389
49
        return 0;
390
391
533
    pthread_mutex_lock(&p->mutex);
392
393
533
    ret = update_context_from_user(p->avctx, user_avctx);
394
533
    if (ret) {
395
        pthread_mutex_unlock(&p->mutex);
396
        return ret;
397
    }
398
533
    atomic_store_explicit(&p->debug_threads,
399
                          (p->avctx->debug & FF_DEBUG_THREADS) != 0,
400
                          memory_order_relaxed);
401
402
533
    release_delayed_buffers(p);
403
404
533
    if (prev_thread) {
405
        int err;
406
521
        if (atomic_load(&prev_thread->state) == STATE_SETTING_UP) {
407
100
            pthread_mutex_lock(&prev_thread->progress_mutex);
408
200
            while (atomic_load(&prev_thread->state) == STATE_SETTING_UP)
409
100
                pthread_cond_wait(&prev_thread->progress_cond, &prev_thread->progress_mutex);
410
100
            pthread_mutex_unlock(&prev_thread->progress_mutex);
411
        }
412
413
521
        err = update_context_from_thread(p->avctx, prev_thread->avctx, 0);
414
521
        if (err) {
415
            pthread_mutex_unlock(&p->mutex);
416
            return err;
417
        }
418
    }
419
420
533
    av_packet_unref(&p->avpkt);
421
533
    ret = av_packet_ref(&p->avpkt, avpkt);
422
533
    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
533
    atomic_store(&p->state, STATE_SETTING_UP);
429
533
    pthread_cond_signal(&p->input_cond);
430
533
    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
533
    if (!p->avctx->thread_safe_callbacks && (
439
368
         p->avctx->get_format != avcodec_default_get_format ||
440
368
         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
533
    fctx->prev_thread = p;
467
533
    fctx->next_decoding++;
468
469
533
    return 0;
470
}
471
472
582
int ff_thread_decode_frame(AVCodecContext *avctx,
473
                           AVFrame *picture, int *got_picture_ptr,
474
                           AVPacket *avpkt)
475
{
476
582
    FrameThreadContext *fctx = avctx->internal->thread_ctx;
477
582
    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
582
    async_unlock(fctx);
484
485
    /*
486
     * Submit a packet to the next decoding thread.
487
     */
488
489
582
    p = &fctx->threads[fctx->next_decoding];
490
582
    err = submit_packet(p, avctx, avpkt);
491
582
    if (err)
492
        goto finish;
493
494
    /*
495
     * If we're still receiving the initial packets, don't return a frame.
496
     */
497
498
582
    if (fctx->next_decoding > (avctx->thread_count-1-(avctx->codec_id == AV_CODEC_ID_FFV1)))
499
118
        fctx->delaying = 0;
500
501
582
    if (fctx->delaying) {
502
68
        *got_picture_ptr=0;
503
68
        if (avpkt->size) {
504
48
            err = avpkt->size;
505
48
            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
615
        p = &fctx->threads[finished++];
518
519
615
        if (atomic_load(&p->state) != STATE_INPUT_READY) {
520
144
            pthread_mutex_lock(&p->progress_mutex);
521
288
            while (atomic_load_explicit(&p->state, memory_order_relaxed) != STATE_INPUT_READY)
522
144
                pthread_cond_wait(&p->output_cond, &p->progress_mutex);
523
144
            pthread_mutex_unlock(&p->progress_mutex);
524
        }
525
526
615
        av_frame_move_ref(picture, p->frame);
527
615
        *got_picture_ptr = p->got_frame;
528
615
        picture->pkt_dts = p->avpkt.dts;
529
615
        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
615
        p->got_frame = 0;
538
615
        p->result = 0;
539
540
615
        if (finished >= avctx->thread_count) finished = 0;
541


615
    } while (!avpkt->size && !*got_picture_ptr && err >= 0 && finished != fctx->next_finished);
542
543
534
    update_context_from_thread(avctx, p->avctx, 1);
544
545
534
    if (fctx->next_decoding >= avctx->thread_count) fctx->next_decoding = 0;
546
547
534
    fctx->next_finished = finished;
548
549
    /* return the size of the consumed packet if no error occurred */
550
534
    if (err >= 0)
551
534
        err = avpkt->size;
552
finish:
553
582
    async_lock(fctx);
554
582
    return err;
555
}
556
557
402376
void ff_thread_report_progress(ThreadFrame *f, int n, int field)
558
{
559
    PerThreadContext *p;
560
402376
    atomic_int *progress = f->progress ? (atomic_int*)f->progress->data : NULL;
561
562
402376
    if (!progress ||
563
1172
        atomic_load_explicit(&progress[field], memory_order_relaxed) >= n)
564
401223
        return;
565
566
1153
    p = f->owner[field]->internal->thread_ctx;
567
568
1153
    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
1153
    pthread_mutex_lock(&p->progress_mutex);
573
574
1153
    atomic_store_explicit(&progress[field], n, memory_order_release);
575
576
1153
    pthread_cond_broadcast(&p->progress_cond);
577
1153
    pthread_mutex_unlock(&p->progress_mutex);
578
}
579
580
2672292
void ff_thread_await_progress(ThreadFrame *f, int n, int field)
581
{
582
    PerThreadContext *p;
583
2672292
    atomic_int *progress = f->progress ? (atomic_int*)f->progress->data : NULL;
584
585
2672292
    if (!progress ||
586
182570
        atomic_load_explicit(&progress[field], memory_order_acquire) >= n)
587
2671957
        return;
588
589
335
    p = f->owner[field]->internal->thread_ctx;
590
591
335
    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
335
    pthread_mutex_lock(&p->progress_mutex);
596
677
    while (atomic_load_explicit(&progress[field], memory_order_relaxed) < n)
597
342
        pthread_cond_wait(&p->progress_cond, &p->progress_mutex);
598
335
    pthread_mutex_unlock(&p->progress_mutex);
599
}
600
601
21570
void ff_thread_finish_setup(AVCodecContext *avctx) {
602
21570
    PerThreadContext *p = avctx->internal->thread_ctx;
603
604
21570
    if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
605
606

533
    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
533
    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
533
    pthread_mutex_lock(&p->progress_mutex);
620
533
    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
533
    atomic_store(&p->state, STATE_SETUP_FINISHED);
625
626
533
    pthread_cond_broadcast(&p->progress_cond);
627
533
    pthread_mutex_unlock(&p->progress_mutex);
628
}
629
630
/// Waits for all threads to finish.
631
12
static void park_frame_worker_threads(FrameThreadContext *fctx, int thread_count)
632
{
633
    int i;
634
635
12
    async_unlock(fctx);
636
637
106
    for (i = 0; i < thread_count; i++) {
638
94
        PerThreadContext *p = &fctx->threads[i];
639
640
94
        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
94
        p->got_frame = 0;
647
    }
648
649
12
    async_lock(fctx);
650
12
}
651
652
12
void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
653
{
654
12
    FrameThreadContext *fctx = avctx->internal->thread_ctx;
655
12
    const AVCodec *codec = avctx->codec;
656
    int i;
657
658
12
    park_frame_worker_threads(fctx, thread_count);
659
660

12
    if (fctx->prev_thread && fctx->prev_thread != fctx->threads)
661
7
        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
106
    for (i = 0; i < thread_count; i++) {
668
94
        PerThreadContext *p = &fctx->threads[i];
669
670
94
        pthread_mutex_lock(&p->mutex);
671
94
        p->die = 1;
672
94
        pthread_cond_signal(&p->input_cond);
673
94
        pthread_mutex_unlock(&p->mutex);
674
675
94
        if (p->thread_init)
676
94
            pthread_join(p->thread, NULL);
677
94
        p->thread_init=0;
678
679

94
        if (codec->close && p->avctx)
680
94
            codec->close(p->avctx);
681
682
94
        release_delayed_buffers(p);
683
94
        av_frame_free(&p->frame);
684
    }
685
686
106
    for (i = 0; i < thread_count; i++) {
687
94
        PerThreadContext *p = &fctx->threads[i];
688
689
94
        pthread_mutex_destroy(&p->mutex);
690
94
        pthread_mutex_destroy(&p->progress_mutex);
691
94
        pthread_cond_destroy(&p->input_cond);
692
94
        pthread_cond_destroy(&p->progress_cond);
693
94
        pthread_cond_destroy(&p->output_cond);
694
94
        av_packet_unref(&p->avpkt);
695
94
        av_freep(&p->released_buffers);
696
697

94
        if (i && p->avctx) {
698
82
            av_freep(&p->avctx->priv_data);
699
82
            av_freep(&p->avctx->slice_offset);
700
        }
701
702
94
        if (p->avctx) {
703
94
            av_freep(&p->avctx->internal);
704
94
            av_buffer_unref(&p->avctx->hw_frames_ctx);
705
        }
706
707
94
        av_freep(&p->avctx);
708
    }
709
710
12
    av_freep(&fctx->threads);
711
12
    pthread_mutex_destroy(&fctx->buffer_mutex);
712
12
    pthread_mutex_destroy(&fctx->hwaccel_mutex);
713
12
    pthread_mutex_destroy(&fctx->async_mutex);
714
12
    pthread_cond_destroy(&fctx->async_cond);
715
716
12
    av_freep(&avctx->internal->thread_ctx);
717
718

12
    if (avctx->priv_data && avctx->codec && avctx->codec->priv_class)
719
6
        av_opt_free(avctx->priv_data);
720
12
    avctx->codec = NULL;
721
12
}
722
723
12
int ff_frame_thread_init(AVCodecContext *avctx)
724
{
725
12
    int thread_count = avctx->thread_count;
726
12
    const AVCodec *codec = avctx->codec;
727
12
    AVCodecContext *src = avctx;
728
    FrameThreadContext *fctx;
729
12
    int i, err = 0;
730
731
12
    if (!thread_count) {
732
4
        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
4
        if (nb_cpus > 1)
739
4
            thread_count = avctx->thread_count = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
740
        else
741
            thread_count = avctx->thread_count = 1;
742
    }
743
744
12
    if (thread_count <= 1) {
745
        avctx->active_thread_type = 0;
746
        return 0;
747
    }
748
749
12
    avctx->internal->thread_ctx = fctx = av_mallocz(sizeof(FrameThreadContext));
750
12
    if (!fctx)
751
        return AVERROR(ENOMEM);
752
753
12
    fctx->threads = av_mallocz_array(thread_count, sizeof(PerThreadContext));
754
12
    if (!fctx->threads) {
755
        av_freep(&avctx->internal->thread_ctx);
756
        return AVERROR(ENOMEM);
757
    }
758
759
12
    pthread_mutex_init(&fctx->buffer_mutex, NULL);
760
12
    pthread_mutex_init(&fctx->hwaccel_mutex, NULL);
761
12
    pthread_mutex_init(&fctx->async_mutex, NULL);
762
12
    pthread_cond_init(&fctx->async_cond, NULL);
763
764
12
    fctx->async_lock = 1;
765
12
    fctx->delaying = 1;
766
767
106
    for (i = 0; i < thread_count; i++) {
768
94
        AVCodecContext *copy = av_malloc(sizeof(AVCodecContext));
769
94
        PerThreadContext *p  = &fctx->threads[i];
770
771
94
        pthread_mutex_init(&p->mutex, NULL);
772
94
        pthread_mutex_init(&p->progress_mutex, NULL);
773
94
        pthread_cond_init(&p->input_cond, NULL);
774
94
        pthread_cond_init(&p->progress_cond, NULL);
775
94
        pthread_cond_init(&p->output_cond, NULL);
776
777
94
        p->frame = av_frame_alloc();
778
94
        if (!p->frame) {
779
            av_freep(&copy);
780
            err = AVERROR(ENOMEM);
781
            goto error;
782
        }
783
784
94
        p->parent = fctx;
785
94
        p->avctx  = copy;
786
787
94
        if (!copy) {
788
            err = AVERROR(ENOMEM);
789
            goto error;
790
        }
791
792
94
        *copy = *src;
793
794
94
        copy->internal = av_malloc(sizeof(AVCodecInternal));
795
94
        if (!copy->internal) {
796
            copy->priv_data = NULL;
797
            err = AVERROR(ENOMEM);
798
            goto error;
799
        }
800
94
        *copy->internal = *src->internal;
801
94
        copy->internal->thread_ctx = p;
802
94
        copy->internal->last_pkt_props = &p->avpkt;
803
804
94
        if (!i) {
805
12
            src = copy;
806
807
12
            if (codec->init)
808
12
                err = codec->init(copy);
809
810
12
            update_context_from_thread(avctx, copy, 1);
811
        } else {
812
82
            copy->priv_data = av_malloc(codec->priv_data_size);
813
82
            if (!copy->priv_data) {
814
                err = AVERROR(ENOMEM);
815
                goto error;
816
            }
817
82
            memcpy(copy->priv_data, src->priv_data, codec->priv_data_size);
818
82
            copy->internal->is_copy = 1;
819
820
82
            if (codec->init_thread_copy)
821
82
                err = codec->init_thread_copy(copy);
822
        }
823
824
94
        if (err) goto error;
825
826
94
        atomic_init(&p->debug_threads, (copy->debug & FF_DEBUG_THREADS) != 0);
827
828
94
        err = AVERROR(pthread_create(&p->thread, NULL, frame_worker_thread, p));
829
94
        p->thread_init= !err;
830
94
        if(!p->thread_init)
831
            goto error;
832
    }
833
834
12
    return 0;
835
836
error:
837
    ff_frame_thread_free(avctx, i+1);
838
839
    return err;
840
}
841
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
872
34119
int ff_thread_can_start_frame(AVCodecContext *avctx)
873
{
874
34119
    PerThreadContext *p = avctx->internal->thread_ctx;
875

34119
    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
34119
    return 1;
880
}
881
882
79023
static int thread_get_buffer_internal(AVCodecContext *avctx, ThreadFrame *f, int flags)
883
{
884
79023
    PerThreadContext *p = avctx->internal->thread_ctx;
885
    int err;
886
887
79023
    f->owner[0] = f->owner[1] = avctx;
888
889
79023
    if (!(avctx->active_thread_type & FF_THREAD_FRAME))
890
78502
        return ff_get_buffer(avctx, f->f, flags);
891
892
521
    if (atomic_load(&p->state) != STATE_SETTING_UP &&
893

453
        (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
521
    if (avctx->internal->allocate_progress) {
899
        atomic_int *progress;
900
68
        f->progress = av_buffer_alloc(2 * sizeof(*progress));
901
68
        if (!f->progress) {
902
            return AVERROR(ENOMEM);
903
        }
904
68
        progress = (atomic_int*)f->progress->data;
905
906
68
        atomic_init(&progress[0], -1);
907
68
        atomic_init(&progress[1], -1);
908
    }
909
910
521
    pthread_mutex_lock(&p->parent->buffer_mutex);
911

521
    if (THREAD_SAFE_CALLBACKS(avctx)) {
912
521
        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

521
    if (!THREAD_SAFE_CALLBACKS(avctx) && !avctx->codec->update_thread_context)
929
        ff_thread_finish_setup(avctx);
930
521
    if (err)
931
        av_buffer_unref(&f->progress);
932
933
521
    pthread_mutex_unlock(&p->parent->buffer_mutex);
934
935
521
    return err;
936
}
937
938
1599
enum AVPixelFormat ff_thread_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
939
{
940
    enum AVPixelFormat res;
941
1599
    PerThreadContext *p = avctx->internal->thread_ctx;
942

1599
    if (!(avctx->active_thread_type & FF_THREAD_FRAME) || avctx->thread_safe_callbacks ||
943
1
        avctx->get_format == avcodec_default_get_format)
944
1599
        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
964
79023
int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
965
{
966
79023
    int ret = thread_get_buffer_internal(avctx, f, flags);
967
79023
    if (ret < 0)
968
        av_log(avctx, AV_LOG_ERROR, "thread_get_buffer() failed\n");
969
79023
    return ret;
970
}
971
972
882474
void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
973
{
974
882474
    PerThreadContext *p = avctx->internal->thread_ctx;
975
    FrameThreadContext *fctx;
976
    AVFrame *dst, *tmp;
977
882983
    int can_direct_free = !(avctx->active_thread_type & FF_THREAD_FRAME) ||
978

509
                          THREAD_SAFE_CALLBACKS(avctx);
979
980

882474
    if (!f->f || !f->f->buf[0])
981
688174
        return;
982
983
194300
    if (avctx->debug & FF_DEBUG_BUFFERS)
984
        av_log(avctx, AV_LOG_DEBUG, "thread_release_buffer called on pic %p\n", f);
985
986
194300
    av_buffer_unref(&f->progress);
987
194300
    f->owner[0] = f->owner[1] = NULL;
988
989
194300
    if (can_direct_free) {
990
194300
        av_frame_unref(f->f);
991
194300
        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
}