1/* 2 * Copyright (c) 2004 Roman Shaposhnik 3 * 4 * Many thanks to Steven M. Schultz for providing clever ideas and 5 * to Michael Niedermayer <michaelni@gmx.at> for writing initial 6 * implementation. 7 * 8 * This file is part of FFmpeg. 9 * 10 * FFmpeg is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU Lesser General Public 12 * License as published by the Free Software Foundation; either 13 * version 2.1 of the License, or (at your option) any later version. 14 * 15 * FFmpeg is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * Lesser General Public License for more details. 19 * 20 * You should have received a copy of the GNU Lesser General Public 21 * License along with FFmpeg; if not, write to the Free Software 22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 23 */ 24#include <pthread.h> 25 26#include "avcodec.h" 27 28typedef int (action_func)(AVCodecContext *c, void *arg); 29 30typedef struct ThreadContext { 31 pthread_t *workers; 32 action_func *func; 33 void *args; 34 int *rets; 35 int rets_count; 36 int job_count; 37 int job_size; 38 39 pthread_cond_t last_job_cond; 40 pthread_cond_t current_job_cond; 41 pthread_mutex_t current_job_lock; 42 int current_job; 43 int done; 44} ThreadContext; 45 46static void* attribute_align_arg worker(void *v) 47{ 48 AVCodecContext *avctx = v; 49 ThreadContext *c = avctx->thread_opaque; 50 int our_job = c->job_count; 51 int thread_count = avctx->thread_count; 52 int self_id; 53 54 pthread_mutex_lock(&c->current_job_lock); 55 self_id = c->current_job++; 56 for (;;){ 57 while (our_job >= c->job_count) { 58 if (c->current_job == thread_count + c->job_count) 59 pthread_cond_signal(&c->last_job_cond); 60 61 pthread_cond_wait(&c->current_job_cond, &c->current_job_lock); 62 our_job = self_id; 63 64 if (c->done) { 65 pthread_mutex_unlock(&c->current_job_lock); 66 return NULL; 67 } 68 } 69 pthread_mutex_unlock(&c->current_job_lock); 70 71 c->rets[our_job%c->rets_count] = c->func(avctx, (char*)c->args + our_job*c->job_size); 72 73 pthread_mutex_lock(&c->current_job_lock); 74 our_job = c->current_job++; 75 } 76} 77 78static av_always_inline void avcodec_thread_park_workers(ThreadContext *c, int thread_count) 79{ 80 pthread_cond_wait(&c->last_job_cond, &c->current_job_lock); 81 pthread_mutex_unlock(&c->current_job_lock); 82} 83 84void avcodec_thread_free(AVCodecContext *avctx) 85{ 86 ThreadContext *c = avctx->thread_opaque; 87 int i; 88 89 pthread_mutex_lock(&c->current_job_lock); 90 c->done = 1; 91 pthread_cond_broadcast(&c->current_job_cond); 92 pthread_mutex_unlock(&c->current_job_lock); 93 94 for (i=0; i<avctx->thread_count; i++) 95 pthread_join(c->workers[i], NULL); 96 97 pthread_mutex_destroy(&c->current_job_lock); 98 pthread_cond_destroy(&c->current_job_cond); 99 pthread_cond_destroy(&c->last_job_cond); 100 av_free(c->workers); 101 av_freep(&avctx->thread_opaque); 102} 103 104int avcodec_thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size) 105{ 106 ThreadContext *c= avctx->thread_opaque; 107 int dummy_ret; 108 109 if (job_count <= 0) 110 return 0; 111 112 pthread_mutex_lock(&c->current_job_lock); 113 114 c->current_job = avctx->thread_count; 115 c->job_count = job_count; 116 c->job_size = job_size; 117 c->args = arg; 118 c->func = func; 119 if (ret) { 120 c->rets = ret; 121 c->rets_count = job_count; 122 } else { 123 c->rets = &dummy_ret; 124 c->rets_count = 1; 125 } 126 pthread_cond_broadcast(&c->current_job_cond); 127 128 avcodec_thread_park_workers(c, avctx->thread_count); 129 130 return 0; 131} 132 133int avcodec_thread_init(AVCodecContext *avctx, int thread_count) 134{ 135 int i; 136 ThreadContext *c; 137 138 c = av_mallocz(sizeof(ThreadContext)); 139 if (!c) 140 return -1; 141 142 c->workers = av_mallocz(sizeof(pthread_t)*thread_count); 143 if (!c->workers) { 144 av_free(c); 145 return -1; 146 } 147 148 avctx->thread_opaque = c; 149 avctx->thread_count = thread_count; 150 c->current_job = 0; 151 c->job_count = 0; 152 c->job_size = 0; 153 c->done = 0; 154 pthread_cond_init(&c->current_job_cond, NULL); 155 pthread_cond_init(&c->last_job_cond, NULL); 156 pthread_mutex_init(&c->current_job_lock, NULL); 157 pthread_mutex_lock(&c->current_job_lock); 158 for (i=0; i<thread_count; i++) { 159 if(pthread_create(&c->workers[i], NULL, worker, avctx)) { 160 avctx->thread_count = i; 161 pthread_mutex_unlock(&c->current_job_lock); 162 avcodec_thread_free(avctx); 163 return -1; 164 } 165 } 166 167 avcodec_thread_park_workers(c, thread_count); 168 169 avctx->execute = avcodec_thread_execute; 170 return 0; 171} 172