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 St, Fifth Floor, Boston, MA 02110-1301 USA
23 // Ported by Vlad Stelmahovsky
31 #define INCL_DOSERRORS
32 #define INCL_DOSDEVIOCTL
35 typedef struct ThreadContext{
36 AVCodecContext *avctx;
40 int (*func)(AVCodecContext *c, void *arg);
46 void thread_func(void *v){
50 //printf("thread_func %X enter wait\n", (int)v); fflush(stdout);
51 DosWaitEventSem(c->work_sem, SEM_INDEFINITE_WAIT);
52 // WaitForSingleObject(c->work_sem, INFINITE);
53 //printf("thread_func %X after wait (func=%X)\n", (int)v, (int)c->func); fflush(stdout);
55 c->ret= c->func(c->avctx, c->arg);
58 //printf("thread_func %X signal complete\n", (int)v); fflush(stdout);
59 DosPostEventSem(c->done_sem);
60 // ReleaseSemaphore(c->done_sem, 1, 0);
67 * free what has been allocated by avcodec_thread_init().
68 * must be called after decoding has finished, especially dont call while avcodec_thread_execute() is running
70 void avcodec_thread_free(AVCodecContext *s){
71 ThreadContext *c= s->thread_opaque;
74 for(i=0; i<s->thread_count; i++){
77 DosPostEventSem(c[i].work_sem);
78 // ReleaseSemaphore(c[i].work_sem, 1, 0);
79 DosWaitThread((PTID)&c[i].thread,DCWW_WAIT);
80 // WaitForSingleObject(c[i].thread, INFINITE);
81 if(c[i].work_sem) DosCloseEventSem(c[i].work_sem);//CloseHandle(c[i].work_sem);
82 if(c[i].done_sem) DosCloseEventSem(c[i].done_sem);//CloseHandle(c[i].done_sem);
85 av_freep(&s->thread_opaque);
88 int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count){
89 ThreadContext *c= s->thread_opaque;
92 assert(s == c->avctx);
93 assert(count <= s->thread_count);
95 /* note, we can be certain that this is not called with the same AVCodecContext by different threads at the same time */
97 for(i=0; i<count; i++){
103 DosPostEventSem(c[i].work_sem);
104 // ReleaseSemaphore(c[i].work_sem, 1, 0);
106 for(i=0; i<count; i++){
107 DosWaitEventSem(c[i].done_sem,SEM_INDEFINITE_WAIT);
108 // WaitForSingleObject(c[i].done_sem, INFINITE);
111 if(ret) ret[i]= c[i].ret;
116 int avcodec_thread_init(AVCodecContext *s, int thread_count){
121 s->thread_count= thread_count;
123 assert(!s->thread_opaque);
124 c= av_mallocz(sizeof(ThreadContext)*thread_count);
127 for(i=0; i<thread_count; i++){
128 //printf("init semaphors %d\n", i); fflush(stdout);
131 if (DosCreateEventSem(NULL,&c[i].work_sem,DC_SEM_SHARED,0))
133 if (DosCreateEventSem(NULL,&c[i].done_sem,DC_SEM_SHARED,0))
136 //printf("create thread %d\n", i); fflush(stdout);
137 // c[i].thread = (HANDLE)_beginthreadex(NULL, 0, thread_func, &c[i], 0, &threadid );
138 c[i].thread = _beginthread(thread_func, NULL, 0x10000, &c[i]);
139 if( c[i].thread <= 0 ) goto fail;
141 //printf("init done\n"); fflush(stdout);
143 s->execute= avcodec_thread_execute;
147 avcodec_thread_free(s);