00001 /* 00002 * Copyright (c) 2004 Roman Shaposhnik 00003 * 00004 * Many thanks to Steven M. Schultz for providing clever ideas and 00005 * to Michael Niedermayer <michaelni@gmx.at> for writing initial 00006 * implementation. 00007 * 00008 * This file is part of FFmpeg. 00009 * 00010 * FFmpeg is free software; you can redistribute it and/or 00011 * modify it under the terms of the GNU Lesser General Public 00012 * License as published by the Free Software Foundation; either 00013 * version 2.1 of the License, or (at your option) any later version. 00014 * 00015 * FFmpeg is distributed in the hope that it will be useful, 00016 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00017 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00018 * Lesser General Public License for more details. 00019 * 00020 * You should have received a copy of the GNU Lesser General Public 00021 * License along with FFmpeg; if not, write to the Free Software 00022 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00023 */ 00024 #include <pthread.h> 00025 00026 #include "avcodec.h" 00027 00028 typedef int (action_func)(AVCodecContext *c, void *arg); 00029 00030 typedef struct ThreadContext { 00031 pthread_t *workers; 00032 action_func *func; 00033 void *args; 00034 int *rets; 00035 int rets_count; 00036 int job_count; 00037 int job_size; 00038 00039 pthread_cond_t last_job_cond; 00040 pthread_cond_t current_job_cond; 00041 pthread_mutex_t current_job_lock; 00042 int current_job; 00043 int done; 00044 } ThreadContext; 00045 00046 static void* attribute_align_arg worker(void *v) 00047 { 00048 AVCodecContext *avctx = v; 00049 ThreadContext *c = avctx->thread_opaque; 00050 int our_job = c->job_count; 00051 int thread_count = avctx->thread_count; 00052 int self_id; 00053 00054 pthread_mutex_lock(&c->current_job_lock); 00055 self_id = c->current_job++; 00056 for (;;){ 00057 while (our_job >= c->job_count) { 00058 if (c->current_job == thread_count + c->job_count) 00059 pthread_cond_signal(&c->last_job_cond); 00060 00061 pthread_cond_wait(&c->current_job_cond, &c->current_job_lock); 00062 our_job = self_id; 00063 00064 if (c->done) { 00065 pthread_mutex_unlock(&c->current_job_lock); 00066 return NULL; 00067 } 00068 } 00069 pthread_mutex_unlock(&c->current_job_lock); 00070 00071 c->rets[our_job%c->rets_count] = c->func(avctx, (char*)c->args + our_job*c->job_size); 00072 00073 pthread_mutex_lock(&c->current_job_lock); 00074 our_job = c->current_job++; 00075 } 00076 } 00077 00078 static av_always_inline void avcodec_thread_park_workers(ThreadContext *c, int thread_count) 00079 { 00080 pthread_cond_wait(&c->last_job_cond, &c->current_job_lock); 00081 pthread_mutex_unlock(&c->current_job_lock); 00082 } 00083 00084 void avcodec_thread_free(AVCodecContext *avctx) 00085 { 00086 ThreadContext *c = avctx->thread_opaque; 00087 int i; 00088 00089 pthread_mutex_lock(&c->current_job_lock); 00090 c->done = 1; 00091 pthread_cond_broadcast(&c->current_job_cond); 00092 pthread_mutex_unlock(&c->current_job_lock); 00093 00094 for (i=0; i<avctx->thread_count; i++) 00095 pthread_join(c->workers[i], NULL); 00096 00097 pthread_mutex_destroy(&c->current_job_lock); 00098 pthread_cond_destroy(&c->current_job_cond); 00099 pthread_cond_destroy(&c->last_job_cond); 00100 av_free(c->workers); 00101 av_freep(&avctx->thread_opaque); 00102 } 00103 00104 int avcodec_thread_execute(AVCodecContext *avctx, action_func* func, void *arg, int *ret, int job_count, int job_size) 00105 { 00106 ThreadContext *c= avctx->thread_opaque; 00107 int dummy_ret; 00108 00109 if (job_count <= 0) 00110 return 0; 00111 00112 pthread_mutex_lock(&c->current_job_lock); 00113 00114 c->current_job = avctx->thread_count; 00115 c->job_count = job_count; 00116 c->job_size = job_size; 00117 c->args = arg; 00118 c->func = func; 00119 if (ret) { 00120 c->rets = ret; 00121 c->rets_count = job_count; 00122 } else { 00123 c->rets = &dummy_ret; 00124 c->rets_count = 1; 00125 } 00126 pthread_cond_broadcast(&c->current_job_cond); 00127 00128 avcodec_thread_park_workers(c, avctx->thread_count); 00129 00130 return 0; 00131 } 00132 00133 int avcodec_thread_init(AVCodecContext *avctx, int thread_count) 00134 { 00135 int i; 00136 ThreadContext *c; 00137 00138 c = av_mallocz(sizeof(ThreadContext)); 00139 if (!c) 00140 return -1; 00141 00142 c->workers = av_mallocz(sizeof(pthread_t)*thread_count); 00143 if (!c->workers) { 00144 av_free(c); 00145 return -1; 00146 } 00147 00148 avctx->thread_opaque = c; 00149 avctx->thread_count = thread_count; 00150 c->current_job = 0; 00151 c->job_count = 0; 00152 c->job_size = 0; 00153 c->done = 0; 00154 pthread_cond_init(&c->current_job_cond, NULL); 00155 pthread_cond_init(&c->last_job_cond, NULL); 00156 pthread_mutex_init(&c->current_job_lock, NULL); 00157 pthread_mutex_lock(&c->current_job_lock); 00158 for (i=0; i<thread_count; i++) { 00159 if(pthread_create(&c->workers[i], NULL, worker, avctx)) { 00160 avctx->thread_count = i; 00161 pthread_mutex_unlock(&c->current_job_lock); 00162 avcodec_thread_free(avctx); 00163 return -1; 00164 } 00165 } 00166 00167 avcodec_thread_park_workers(c, thread_count); 00168 00169 avctx->execute = avcodec_thread_execute; 00170 return 0; 00171 }