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
25 #define WIN32_LEAN_AND_MEAN
29 typedef struct ThreadContext{
30 AVCodecContext *avctx;
35 int (*func)(AVCodecContext *c, void *arg);
36 int (*func2)(AVCodecContext *c, void *arg, int, int);
45 static unsigned WINAPI attribute_align_arg thread_func(void *v){
50 //printf("thread_func %X enter wait\n", (int)v); fflush(stdout);
51 WaitForSingleObject(c->work_sem, INFINITE);
52 // avoid trying to access jobnr if we should quit
53 if (!c->func && !c->func2)
55 WaitForSingleObject(c->job_sem, INFINITE);
56 jobnr = (*c->jobnr)++;
57 ReleaseSemaphore(c->job_sem, 1, 0);
58 //printf("thread_func %X after wait (func=%X)\n", (int)v, (int)c->func); fflush(stdout);
60 ret= c->func(c->avctx, (uint8_t *)c->arg + jobnr*c->argsize);
62 ret= c->func2(c->avctx, c->arg, jobnr, c->threadnr);
65 //printf("thread_func %X signal complete\n", (int)v); fflush(stdout);
66 ReleaseSemaphore(c->done_sem, 1, 0);
73 * Free what has been allocated by ff_thread_init().
74 * Must be called after decoding has finished, especially do not call while avcodec_thread_execute() is running.
76 void ff_thread_free(AVCodecContext *s){
77 ThreadContext *c= s->thread_opaque;
80 for(i=0; i<s->thread_count; i++){
85 ReleaseSemaphore(c[0].work_sem, s->thread_count, 0);
86 for(i=0; i<s->thread_count; i++){
87 WaitForSingleObject(c[i].thread, INFINITE);
88 if(c[i].thread) CloseHandle(c[i].thread);
90 if(c[0].work_sem) CloseHandle(c[0].work_sem);
91 if(c[0].job_sem) CloseHandle(c[0].job_sem);
92 if(c[0].done_sem) CloseHandle(c[0].done_sem);
94 av_freep(&s->thread_opaque);
97 static int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size){
98 ThreadContext *c= s->thread_opaque;
102 assert(s == c->avctx);
104 /* note, we can be certain that this is not called with the same AVCodecContext by different threads at the same time */
106 for(i=0; i<s->thread_count; i++){
113 ReleaseSemaphore(c[0].work_sem, count, 0);
114 for(i=0; i<count; i++)
115 WaitForSingleObject(c[0].done_sem, INFINITE);
120 static int avcodec_thread_execute2(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count){
121 ThreadContext *c= s->thread_opaque;
123 for(i=0; i<s->thread_count; i++)
125 avcodec_thread_execute(s, NULL, arg, ret, count, 0);
128 int ff_thread_init(AVCodecContext *s){
133 if(!(s->thread_type & FF_THREAD_SLICE)){
134 av_log(s, AV_LOG_WARNING, "The requested thread algorithm is not supported with this thread library.\n");
138 if (s->thread_count <= 1)
141 s->active_thread_type= FF_THREAD_SLICE;
143 assert(!s->thread_opaque);
144 c= av_mallocz(sizeof(ThreadContext)*s->thread_count);
146 if(!(c[0].work_sem = CreateSemaphore(NULL, 0, INT_MAX, NULL)))
148 if(!(c[0].job_sem = CreateSemaphore(NULL, 1, 1, NULL)))
150 if(!(c[0].done_sem = CreateSemaphore(NULL, 0, INT_MAX, NULL)))
153 for(i=0; i<s->thread_count; i++){
154 //printf("init semaphors %d\n", i); fflush(stdout);
156 c[i].work_sem = c[0].work_sem;
157 c[i].job_sem = c[0].job_sem;
158 c[i].done_sem = c[0].done_sem;
161 //printf("create thread %d\n", i); fflush(stdout);
162 c[i].thread = (HANDLE)_beginthreadex(NULL, 0, thread_func, &c[i], 0, &threadid );
163 if( !c[i].thread ) goto fail;
165 //printf("init done\n"); fflush(stdout);
167 s->execute= avcodec_thread_execute;
168 s->execute2= avcodec_thread_execute2;