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
24 #define WIN32_LEAN_AND_MEAN
28 typedef struct ThreadContext{
29 AVCodecContext *avctx;
34 int (*func)(AVCodecContext *c, void *arg);
35 int (*func2)(AVCodecContext *c, void *arg, int, int);
44 static unsigned WINAPI attribute_align_arg thread_func(void *v){
49 //printf("thread_func %X enter wait\n", (int)v); fflush(stdout);
50 WaitForSingleObject(c->work_sem, INFINITE);
51 // avoid trying to access jobnr if we should quit
52 if (!c->func && !c->func2)
54 WaitForSingleObject(c->job_sem, INFINITE);
55 jobnr = (*c->jobnr)++;
56 ReleaseSemaphore(c->job_sem, 1, 0);
57 //printf("thread_func %X after wait (func=%X)\n", (int)v, (int)c->func); fflush(stdout);
59 ret= c->func(c->avctx, (uint8_t *)c->arg + jobnr*c->argsize);
61 ret= c->func2(c->avctx, c->arg, jobnr, c->threadnr);
64 //printf("thread_func %X signal complete\n", (int)v); fflush(stdout);
65 ReleaseSemaphore(c->done_sem, 1, 0);
72 * Free what has been allocated by avcodec_thread_init().
73 * Must be called after decoding has finished, especially do not call while avcodec_thread_execute() is running.
75 void avcodec_thread_free(AVCodecContext *s){
76 ThreadContext *c= s->thread_opaque;
79 for(i=0; i<s->thread_count; i++){
84 ReleaseSemaphore(c[0].work_sem, s->thread_count, 0);
85 for(i=0; i<s->thread_count; i++){
86 WaitForSingleObject(c[i].thread, INFINITE);
87 if(c[i].thread) CloseHandle(c[i].thread);
89 if(c[0].work_sem) CloseHandle(c[0].work_sem);
90 if(c[0].job_sem) CloseHandle(c[0].job_sem);
91 if(c[0].done_sem) CloseHandle(c[0].done_sem);
93 av_freep(&s->thread_opaque);
96 int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size){
97 ThreadContext *c= s->thread_opaque;
101 assert(s == c->avctx);
103 /* note, we can be certain that this is not called with the same AVCodecContext by different threads at the same time */
105 for(i=0; i<s->thread_count; i++){
112 ReleaseSemaphore(c[0].work_sem, count, 0);
113 for(i=0; i<count; i++)
114 WaitForSingleObject(c[0].done_sem, INFINITE);
119 int avcodec_thread_execute2(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count){
120 ThreadContext *c= s->thread_opaque;
122 for(i=0; i<s->thread_count; i++)
124 avcodec_thread_execute(s, NULL, arg, ret, count, 0);
127 int avcodec_thread_init(AVCodecContext *s, int thread_count){
132 s->thread_count= thread_count;
134 if (thread_count <= 1)
137 assert(!s->thread_opaque);
138 c= av_mallocz(sizeof(ThreadContext)*thread_count);
140 if(!(c[0].work_sem = CreateSemaphore(NULL, 0, INT_MAX, NULL)))
142 if(!(c[0].job_sem = CreateSemaphore(NULL, 1, 1, NULL)))
144 if(!(c[0].done_sem = CreateSemaphore(NULL, 0, INT_MAX, NULL)))
147 for(i=0; i<thread_count; i++){
148 //printf("init semaphors %d\n", i); fflush(stdout);
150 c[i].work_sem = c[0].work_sem;
151 c[i].job_sem = c[0].job_sem;
152 c[i].done_sem = c[0].done_sem;
155 //printf("create thread %d\n", i); fflush(stdout);
156 c[i].thread = (HANDLE)_beginthreadex(NULL, 0, thread_func, &c[i], 0, &threadid );
157 if( !c[i].thread ) goto fail;
159 //printf("init done\n"); fflush(stdout);
161 s->execute= avcodec_thread_execute;
162 s->execute2= avcodec_thread_execute2;
166 avcodec_thread_free(s);