FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/pthread.c
Date: 2022-07-07 01:21:54
Exec Total Coverage
Lines: 46 47 97.9%
Branches: 35 44 79.5%

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1 /*
2 * Copyright (c) 2004 Roman Shaposhnik
3 * Copyright (c) 2008 Alexander Strange (astrange@ithinksw.com)
4 *
5 * Many thanks to Steven M. Schultz for providing clever ideas and
6 * to Michael Niedermayer <michaelni@gmx.at> for writing initial
7 * implementation.
8 *
9 * This file is part of FFmpeg.
10 *
11 * FFmpeg is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU Lesser General Public
13 * License as published by the Free Software Foundation; either
14 * version 2.1 of the License, or (at your option) any later version.
15 *
16 * FFmpeg is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * Lesser General Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser General Public
22 * License along with FFmpeg; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 */
25
26 /**
27 * @file
28 * Multithreading support functions
29 * @see doc/multithreading.txt
30 */
31
32 #include "libavutil/thread.h"
33
34 #include "avcodec.h"
35 #include "codec_internal.h"
36 #include "pthread_internal.h"
37 #include "thread.h"
38
39 /**
40 * Set the threading algorithms used.
41 *
42 * Threading requires more than one thread.
43 * Frame threading requires entire frames to be passed to the codec,
44 * and introduces extra decoding delay, so is incompatible with low_delay.
45 *
46 * @param avctx The context.
47 */
48 30052 static void validate_thread_parameters(AVCodecContext *avctx)
49 {
50 60104 int frame_threading_supported = (avctx->codec->capabilities & AV_CODEC_CAP_FRAME_THREADS)
51 #if FF_API_FLAG_TRUNCATED
52
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17930 && !(avctx->flags & AV_CODEC_FLAG_TRUNCATED)
53 #endif
54
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17930 && !(avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
55
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47982 && !(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS);
56
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30052 if (avctx->thread_count == 1) {
57 28947 avctx->active_thread_type = 0;
58
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1105 } else if (frame_threading_supported && (avctx->thread_type & FF_THREAD_FRAME)) {
59 8 avctx->active_thread_type = FF_THREAD_FRAME;
60
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1097 } else if (avctx->codec->capabilities & AV_CODEC_CAP_SLICE_THREADS &&
61
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17 avctx->thread_type & FF_THREAD_SLICE) {
62 17 avctx->active_thread_type = FF_THREAD_SLICE;
63
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1080 } else if (!(ffcodec(avctx->codec)->caps_internal & FF_CODEC_CAP_AUTO_THREADS)) {
64 1080 avctx->thread_count = 1;
65 1080 avctx->active_thread_type = 0;
66 }
67
68
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30052 if (avctx->thread_count > MAX_AUTO_THREADS)
69 av_log(avctx, AV_LOG_WARNING,
70 "Application has requested %d threads. Using a thread count greater than %d is not recommended.\n",
71 avctx->thread_count, MAX_AUTO_THREADS);
72 30052 }
73
74 30052 int ff_thread_init(AVCodecContext *avctx)
75 {
76 30052 validate_thread_parameters(avctx);
77
78
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30052 if (avctx->active_thread_type&FF_THREAD_SLICE)
79 17 return ff_slice_thread_init(avctx);
80
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30035 else if (avctx->active_thread_type&FF_THREAD_FRAME)
81 8 return ff_frame_thread_init(avctx);
82
83 30027 return 0;
84 }
85
86 25 void ff_thread_free(AVCodecContext *avctx)
87 {
88
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25 if (avctx->active_thread_type&FF_THREAD_FRAME)
89 8 ff_frame_thread_free(avctx, avctx->thread_count);
90 else
91 17 ff_slice_thread_free(avctx);
92 25 }
93
94 2051 av_cold void ff_pthread_free(void *obj, const unsigned offsets[])
95 {
96 2051 unsigned cnt = *(unsigned*)((char*)obj + offsets[0]);
97 2051 const unsigned *cur_offset = offsets;
98
99 2051 *(unsigned*)((char*)obj + offsets[0]) = 0;
100
101
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6739 for (; *(++cur_offset) != THREAD_SENTINEL && cnt; cnt--)
102 4688 pthread_mutex_destroy((pthread_mutex_t*)((char*)obj + *cur_offset));
103
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5265 for (; *(++cur_offset) != THREAD_SENTINEL && cnt; cnt--)
104 3214 pthread_cond_destroy ((pthread_cond_t *)((char*)obj + *cur_offset));
105 2051 }
106
107 1582 av_cold int ff_pthread_init(void *obj, const unsigned offsets[])
108 {
109 1582 const unsigned *cur_offset = offsets;
110 1582 unsigned cnt = 0;
111 int err;
112
113 #define PTHREAD_INIT_LOOP(type) \
114 for (; *(++cur_offset) != THREAD_SENTINEL; cnt++) { \
115 pthread_ ## type ## _t *dst = (void*)((char*)obj + *cur_offset); \
116 err = pthread_ ## type ## _init(dst, NULL); \
117 if (err) { \
118 err = AVERROR(err); \
119 goto fail; \
120 } \
121 }
122
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6270 PTHREAD_INIT_LOOP(mutex)
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4796 PTHREAD_INIT_LOOP(cond)
124
125 1582 fail:
126 1582 *(unsigned*)((char*)obj + offsets[0]) = cnt;
127 1582 return err;
128 }
129