Libav 0.7.1
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00001 /* 00002 * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at> 00003 * 00004 * This file is part of Libav. 00005 * 00006 * Libav is free software; you can redistribute it and/or 00007 * modify it under the terms of the GNU Lesser General Public 00008 * License as published by the Free Software Foundation; either 00009 * version 2.1 of the License, or (at your option) any later version. 00010 * 00011 * Libav is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00014 * Lesser General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU Lesser General Public 00017 * License along with Libav; if not, write to the Free Software 00018 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00019 */ 00020 //#define DEBUG 00021 00022 #include "avcodec.h" 00023 #include "thread.h" 00024 00025 #define WIN32_LEAN_AND_MEAN 00026 #include <windows.h> 00027 #include <process.h> 00028 00029 typedef struct ThreadContext{ 00030 AVCodecContext *avctx; 00031 HANDLE thread; 00032 HANDLE work_sem; 00033 HANDLE job_sem; 00034 HANDLE done_sem; 00035 int (*func)(AVCodecContext *c, void *arg); 00036 int (*func2)(AVCodecContext *c, void *arg, int, int); 00037 void *arg; 00038 int argsize; 00039 int *jobnr; 00040 int *ret; 00041 int threadnr; 00042 }ThreadContext; 00043 00044 00045 static unsigned WINAPI attribute_align_arg thread_func(void *v){ 00046 ThreadContext *c= v; 00047 00048 for(;;){ 00049 int ret, jobnr; 00050 //printf("thread_func %X enter wait\n", (int)v); fflush(stdout); 00051 WaitForSingleObject(c->work_sem, INFINITE); 00052 // avoid trying to access jobnr if we should quit 00053 if (!c->func && !c->func2) 00054 break; 00055 WaitForSingleObject(c->job_sem, INFINITE); 00056 jobnr = (*c->jobnr)++; 00057 ReleaseSemaphore(c->job_sem, 1, 0); 00058 //printf("thread_func %X after wait (func=%X)\n", (int)v, (int)c->func); fflush(stdout); 00059 if(c->func) 00060 ret= c->func(c->avctx, (uint8_t *)c->arg + jobnr*c->argsize); 00061 else 00062 ret= c->func2(c->avctx, c->arg, jobnr, c->threadnr); 00063 if (c->ret) 00064 c->ret[jobnr] = ret; 00065 //printf("thread_func %X signal complete\n", (int)v); fflush(stdout); 00066 ReleaseSemaphore(c->done_sem, 1, 0); 00067 } 00068 00069 return 0; 00070 } 00071 00076 void ff_thread_free(AVCodecContext *s){ 00077 ThreadContext *c= s->thread_opaque; 00078 int i; 00079 00080 for(i=0; i<s->thread_count; i++){ 00081 00082 c[i].func= NULL; 00083 c[i].func2= NULL; 00084 } 00085 ReleaseSemaphore(c[0].work_sem, s->thread_count, 0); 00086 for(i=0; i<s->thread_count; i++){ 00087 WaitForSingleObject(c[i].thread, INFINITE); 00088 if(c[i].thread) CloseHandle(c[i].thread); 00089 } 00090 if(c[0].work_sem) CloseHandle(c[0].work_sem); 00091 if(c[0].job_sem) CloseHandle(c[0].job_sem); 00092 if(c[0].done_sem) CloseHandle(c[0].done_sem); 00093 00094 av_freep(&s->thread_opaque); 00095 } 00096 00097 static int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size){ 00098 ThreadContext *c= s->thread_opaque; 00099 int i; 00100 int jobnr = 0; 00101 00102 assert(s == c->avctx); 00103 00104 /* note, we can be certain that this is not called with the same AVCodecContext by different threads at the same time */ 00105 00106 for(i=0; i<s->thread_count; i++){ 00107 c[i].arg= arg; 00108 c[i].argsize= size; 00109 c[i].func= func; 00110 c[i].ret= ret; 00111 c[i].jobnr = &jobnr; 00112 } 00113 ReleaseSemaphore(c[0].work_sem, count, 0); 00114 for(i=0; i<count; i++) 00115 WaitForSingleObject(c[0].done_sem, INFINITE); 00116 00117 return 0; 00118 } 00119 00120 static int avcodec_thread_execute2(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count){ 00121 ThreadContext *c= s->thread_opaque; 00122 int i; 00123 for(i=0; i<s->thread_count; i++) 00124 c[i].func2 = func; 00125 avcodec_thread_execute(s, NULL, arg, ret, count, 0); 00126 } 00127 00128 int ff_thread_init(AVCodecContext *s){ 00129 int i; 00130 ThreadContext *c; 00131 uint32_t threadid; 00132 00133 if(!(s->thread_type & FF_THREAD_SLICE)){ 00134 av_log(s, AV_LOG_WARNING, "The requested thread algorithm is not supported with this thread library.\n"); 00135 return 0; 00136 } 00137 00138 s->active_thread_type= FF_THREAD_SLICE; 00139 00140 if (s->thread_count <= 1) 00141 return 0; 00142 00143 assert(!s->thread_opaque); 00144 c= av_mallocz(sizeof(ThreadContext)*s->thread_count); 00145 s->thread_opaque= c; 00146 if(!(c[0].work_sem = CreateSemaphore(NULL, 0, INT_MAX, NULL))) 00147 goto fail; 00148 if(!(c[0].job_sem = CreateSemaphore(NULL, 1, 1, NULL))) 00149 goto fail; 00150 if(!(c[0].done_sem = CreateSemaphore(NULL, 0, INT_MAX, NULL))) 00151 goto fail; 00152 00153 for(i=0; i<s->thread_count; i++){ 00154 //printf("init semaphors %d\n", i); fflush(stdout); 00155 c[i].avctx= s; 00156 c[i].work_sem = c[0].work_sem; 00157 c[i].job_sem = c[0].job_sem; 00158 c[i].done_sem = c[0].done_sem; 00159 c[i].threadnr = i; 00160 00161 //printf("create thread %d\n", i); fflush(stdout); 00162 c[i].thread = (HANDLE)_beginthreadex(NULL, 0, thread_func, &c[i], 0, &threadid ); 00163 if( !c[i].thread ) goto fail; 00164 } 00165 //printf("init done\n"); fflush(stdout); 00166 00167 s->execute= avcodec_thread_execute; 00168 s->execute2= avcodec_thread_execute2; 00169 00170 return 0; 00171 fail: 00172 ff_thread_free(s); 00173 return -1; 00174 }