2 * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of FFmpeg.
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.
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.
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
26 #define WIN32_LEAN_AND_MEAN
30 typedef struct ThreadContext{
31 AVCodecContext *avctx;
35 int (*func)(AVCodecContext *c, void *arg);
41 static unsigned __stdcall thread_func(void *v){
45 //printf("thread_func %X enter wait\n", (int)v); fflush(stdout);
46 WaitForSingleObject(c->work_sem, INFINITE);
47 //printf("thread_func %X after wait (func=%X)\n", (int)v, (int)c->func); fflush(stdout);
49 c->ret= c->func(c->avctx, c->arg);
52 //printf("thread_func %X signal complete\n", (int)v); fflush(stdout);
53 ReleaseSemaphore(c->done_sem, 1, 0);
60 * free what has been allocated by avcodec_thread_init().
61 * must be called after decoding has finished, especially dont call while avcodec_thread_execute() is running
63 void avcodec_thread_free(AVCodecContext *s){
64 ThreadContext *c= s->thread_opaque;
67 for(i=0; i<s->thread_count; i++){
70 ReleaseSemaphore(c[i].work_sem, 1, 0);
71 WaitForSingleObject(c[i].thread, INFINITE);
72 if(c[i].work_sem) CloseHandle(c[i].work_sem);
73 if(c[i].done_sem) CloseHandle(c[i].done_sem);
76 av_freep(&s->thread_opaque);
79 int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count){
80 ThreadContext *c= s->thread_opaque;
83 assert(s == c->avctx);
84 assert(count <= s->thread_count);
86 /* note, we can be certain that this is not called with the same AVCodecContext by different threads at the same time */
88 for(i=0; i<count; i++){
93 ReleaseSemaphore(c[i].work_sem, 1, 0);
95 for(i=0; i<count; i++){
96 WaitForSingleObject(c[i].done_sem, INFINITE);
99 if(ret) ret[i]= c[i].ret;
104 int avcodec_thread_init(AVCodecContext *s, int thread_count){
109 s->thread_count= thread_count;
111 assert(!s->thread_opaque);
112 c= av_mallocz(sizeof(ThreadContext)*thread_count);
115 for(i=0; i<thread_count; i++){
116 //printf("init semaphors %d\n", i); fflush(stdout);
119 if(!(c[i].work_sem = CreateSemaphore(NULL, 0, s->thread_count, NULL)))
121 if(!(c[i].done_sem = CreateSemaphore(NULL, 0, s->thread_count, NULL)))
124 //printf("create thread %d\n", i); fflush(stdout);
125 c[i].thread = (HANDLE)_beginthreadex(NULL, 0, thread_func, &c[i], 0, &threadid );
126 if( !c[i].thread ) goto fail;
128 //printf("init done\n"); fflush(stdout);
130 s->execute= avcodec_thread_execute;
134 avcodec_thread_free(s);