| Line | Branch | Exec | Source |
|---|---|---|---|
| 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/attributes.h" | ||
| 33 | #include "libavutil/thread.h" | ||
| 34 | |||
| 35 | #include "avcodec.h" | ||
| 36 | #include "avcodec_internal.h" | ||
| 37 | #include "codec_internal.h" | ||
| 38 | #include "pthread_internal.h" | ||
| 39 | |||
| 40 | /** | ||
| 41 | * Set the threading algorithms used. | ||
| 42 | * | ||
| 43 | * Threading requires more than one thread. | ||
| 44 | * Frame threading requires entire frames to be passed to the codec, | ||
| 45 | * and introduces extra decoding delay, so is incompatible with low_delay. | ||
| 46 | * | ||
| 47 | * @param avctx The context. | ||
| 48 | */ | ||
| 49 | 35399 | static av_cold void validate_thread_parameters(AVCodecContext *avctx) | |
| 50 | { | ||
| 51 | 70798 | int frame_threading_supported = (avctx->codec->capabilities & AV_CODEC_CAP_FRAME_THREADS) | |
| 52 |
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21249 | && !(avctx->flags & AV_CODEC_FLAG_LOW_DELAY) |
| 53 |
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56648 | && !(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS); |
| 54 |
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35399 | if (avctx->thread_count == 1) { |
| 55 | 34178 | avctx->active_thread_type = 0; | |
| 56 |
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1221 | } else if (frame_threading_supported && (avctx->thread_type & FF_THREAD_FRAME)) { |
| 57 | 10 | avctx->active_thread_type = FF_THREAD_FRAME; | |
| 58 |
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1211 | } else if (avctx->codec->capabilities & AV_CODEC_CAP_SLICE_THREADS && |
| 59 |
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28 | avctx->thread_type & FF_THREAD_SLICE) { |
| 60 | 28 | avctx->active_thread_type = FF_THREAD_SLICE; | |
| 61 |
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1183 | } else if (!(ffcodec(avctx->codec)->caps_internal & FF_CODEC_CAP_AUTO_THREADS)) { |
| 62 | 1183 | avctx->thread_count = 1; | |
| 63 | 1183 | avctx->active_thread_type = 0; | |
| 64 | } | ||
| 65 | |||
| 66 |
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35399 | if (avctx->thread_count > MAX_AUTO_THREADS) |
| 67 | ✗ | av_log(avctx, AV_LOG_WARNING, | |
| 68 | "Application has requested %d threads. Using a thread count greater than %d is not recommended.\n", | ||
| 69 | avctx->thread_count, MAX_AUTO_THREADS); | ||
| 70 | 35399 | } | |
| 71 | |||
| 72 | 35399 | av_cold int ff_thread_init(AVCodecContext *avctx) | |
| 73 | { | ||
| 74 | 35399 | validate_thread_parameters(avctx); | |
| 75 | |||
| 76 |
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35399 | if (avctx->active_thread_type&FF_THREAD_SLICE) |
| 77 | 28 | return ff_slice_thread_init(avctx); | |
| 78 |
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35371 | else if (avctx->active_thread_type&FF_THREAD_FRAME) |
| 79 | 10 | return ff_frame_thread_init(avctx); | |
| 80 | |||
| 81 | 35361 | return 0; | |
| 82 | } | ||
| 83 | |||
| 84 | 35 | av_cold void ff_thread_free(AVCodecContext *avctx) | |
| 85 | { | ||
| 86 |
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35 | if (avctx->active_thread_type&FF_THREAD_FRAME) |
| 87 | 10 | ff_frame_thread_free(avctx, avctx->thread_count); | |
| 88 | else | ||
| 89 | 25 | ff_slice_thread_free(avctx); | |
| 90 | 35 | } | |
| 91 | |||
| 92 | 6158 | av_cold void ff_pthread_free(void *obj, const unsigned offsets[]) | |
| 93 | { | ||
| 94 | 6158 | unsigned cnt = *(unsigned*)((char*)obj + offsets[0]); | |
| 95 | 6158 | const unsigned *cur_offset = offsets; | |
| 96 | |||
| 97 | 6158 | *(unsigned*)((char*)obj + offsets[0]) = 0; | |
| 98 | |||
| 99 |
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9660 | for (; *(++cur_offset) != THREAD_SENTINEL && cnt; cnt--) |
| 100 | 3502 | pthread_mutex_destroy((pthread_mutex_t*)((char*)obj + *cur_offset)); | |
| 101 |
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9716 | for (; *(++cur_offset) != THREAD_SENTINEL && cnt; cnt--) |
| 102 | 3558 | pthread_cond_destroy ((pthread_cond_t *)((char*)obj + *cur_offset)); | |
| 103 | 6158 | } | |
| 104 | |||
| 105 | 1758 | av_cold int ff_pthread_init(void *obj, const unsigned offsets[]) | |
| 106 | { | ||
| 107 | 1758 | const unsigned *cur_offset = offsets; | |
| 108 | 1758 | unsigned cnt = 0; | |
| 109 | int err; | ||
| 110 | |||
| 111 | #define PTHREAD_INIT_LOOP(type) \ | ||
| 112 | for (; *(++cur_offset) != THREAD_SENTINEL; cnt++) { \ | ||
| 113 | pthread_ ## type ## _t *dst = (void*)((char*)obj + *cur_offset); \ | ||
| 114 | err = pthread_ ## type ## _init(dst, NULL); \ | ||
| 115 | if (err) { \ | ||
| 116 | err = AVERROR(err); \ | ||
| 117 | goto fail; \ | ||
| 118 | } \ | ||
| 119 | } | ||
| 120 |
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5260 | PTHREAD_INIT_LOOP(mutex) |
| 121 |
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5316 | PTHREAD_INIT_LOOP(cond) |
| 122 | |||
| 123 | 1758 | fail: | |
| 124 | 1758 | *(unsigned*)((char*)obj + offsets[0]) = cnt; | |
| 125 | 1758 | return err; | |
| 126 | } | ||
| 127 |