1/* 2 * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at> 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20//#define DEBUG 21 22#include "avcodec.h" 23 24#define WIN32_LEAN_AND_MEAN 25#include <windows.h> 26#include <process.h> 27 28typedef struct ThreadContext{ 29 AVCodecContext *avctx; 30 HANDLE thread; 31 HANDLE work_sem; 32 HANDLE done_sem; 33 int (*func)(AVCodecContext *c, void *arg); 34 void *arg; 35 int ret; 36}ThreadContext; 37 38 39static unsigned WINAPI attribute_align_arg thread_func(void *v){ 40 ThreadContext *c= v; 41 42 for(;;){ 43//printf("thread_func %X enter wait\n", (int)v); fflush(stdout); 44 WaitForSingleObject(c->work_sem, INFINITE); 45//printf("thread_func %X after wait (func=%X)\n", (int)v, (int)c->func); fflush(stdout); 46 if(c->func) 47 c->ret= c->func(c->avctx, c->arg); 48 else 49 return 0; 50//printf("thread_func %X signal complete\n", (int)v); fflush(stdout); 51 ReleaseSemaphore(c->done_sem, 1, 0); 52 } 53 54 return 0; 55} 56 57/** 58 * Free what has been allocated by avcodec_thread_init(). 59 * Must be called after decoding has finished, especially do not call while avcodec_thread_execute() is running. 60 */ 61void avcodec_thread_free(AVCodecContext *s){ 62 ThreadContext *c= s->thread_opaque; 63 int i; 64 65 for(i=0; i<s->thread_count; i++){ 66 67 c[i].func= NULL; 68 ReleaseSemaphore(c[i].work_sem, 1, 0); 69 WaitForSingleObject(c[i].thread, INFINITE); 70 if(c[i].work_sem) CloseHandle(c[i].work_sem); 71 if(c[i].done_sem) CloseHandle(c[i].done_sem); 72 } 73 74 av_freep(&s->thread_opaque); 75} 76 77int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size){ 78 ThreadContext *c= s->thread_opaque; 79 int i; 80 81 assert(s == c->avctx); 82 assert(count <= s->thread_count); 83 84 /* note, we can be certain that this is not called with the same AVCodecContext by different threads at the same time */ 85 86 for(i=0; i<count; i++){ 87 c[i].arg= (char*)arg + i*size; 88 c[i].func= func; 89 c[i].ret= 12345; 90 91 ReleaseSemaphore(c[i].work_sem, 1, 0); 92 } 93 for(i=0; i<count; i++){ 94 WaitForSingleObject(c[i].done_sem, INFINITE); 95 96 c[i].func= NULL; 97 if(ret) ret[i]= c[i].ret; 98 } 99 return 0; 100} 101 102int avcodec_thread_init(AVCodecContext *s, int thread_count){ 103 int i; 104 ThreadContext *c; 105 uint32_t threadid; 106 107 s->thread_count= thread_count; 108 109 assert(!s->thread_opaque); 110 c= av_mallocz(sizeof(ThreadContext)*thread_count); 111 s->thread_opaque= c; 112 113 for(i=0; i<thread_count; i++){ 114//printf("init semaphors %d\n", i); fflush(stdout); 115 c[i].avctx= s; 116 117 if(!(c[i].work_sem = CreateSemaphore(NULL, 0, s->thread_count, NULL))) 118 goto fail; 119 if(!(c[i].done_sem = CreateSemaphore(NULL, 0, s->thread_count, NULL))) 120 goto fail; 121 122//printf("create thread %d\n", i); fflush(stdout); 123 c[i].thread = (HANDLE)_beginthreadex(NULL, 0, thread_func, &c[i], 0, &threadid ); 124 if( !c[i].thread ) goto fail; 125 } 126//printf("init done\n"); fflush(stdout); 127 128 s->execute= avcodec_thread_execute; 129 130 return 0; 131fail: 132 avcodec_thread_free(s); 133 return -1; 134} 135