mirror of
https://github.com/FFmpeg/FFmpeg.git
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140 lines
3.9 KiB
C
140 lines
3.9 KiB
C
/*
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* Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <semaphore.h>
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#include <pthread.h>
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//#define DEBUG
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#include "avcodec.h"
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#include "common.h"
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typedef struct ThreadContext{
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AVCodecContext *avctx;
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pthread_t thread;
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sem_t work_sem;
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sem_t done_sem;
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int (*func)(AVCodecContext *c, void *arg);
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void *arg;
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int ret;
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}ThreadContext;
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static void * thread_func(void *v){
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ThreadContext *c= v;
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for(;;){
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//printf("thread_func %X enter wait\n", (int)v); fflush(stdout);
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sem_wait(&c->work_sem);
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//printf("thread_func %X after wait (func=%X)\n", (int)v, (int)c->func); fflush(stdout);
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if(c->func)
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c->ret= c->func(c->avctx, c->arg);
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else
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return NULL;
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//printf("thread_func %X signal complete\n", (int)v); fflush(stdout);
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sem_post(&c->done_sem);
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}
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return NULL;
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}
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/**
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* free what has been allocated by avcodec_thread_init().
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* must be called after decoding has finished, especially dont call while avcodec_thread_execute() is running
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*/
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void avcodec_thread_free(AVCodecContext *s){
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ThreadContext *c= s->thread_opaque;
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int i;
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for(i=0; i<s->thread_count; i++){
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int val;
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sem_getvalue(&c[i].work_sem, &val); assert(val == 0);
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sem_getvalue(&c[i].done_sem, &val); assert(val == 0);
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c[i].func= NULL;
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sem_post(&c[i].work_sem);
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pthread_join(c[i].thread, NULL);
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sem_destroy(&c[i].work_sem);
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sem_destroy(&c[i].done_sem);
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}
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av_freep(&s->thread_opaque);
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}
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int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count){
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ThreadContext *c= s->thread_opaque;
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int i, val;
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assert(s == c->avctx);
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assert(count <= s->thread_count);
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/* note, we can be certain that this is not called with the same AVCodecContext by different threads at the same time */
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for(i=0; i<count; i++){
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sem_getvalue(&c[i].work_sem, &val); assert(val == 0);
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sem_getvalue(&c[i].done_sem, &val); assert(val == 0);
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c[i].arg= arg[i];
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c[i].func= func;
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c[i].ret= 12345;
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sem_post(&c[i].work_sem);
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}
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for(i=0; i<count; i++){
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sem_wait(&c[i].done_sem);
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sem_getvalue(&c[i].work_sem, &val); assert(val == 0);
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sem_getvalue(&c[i].done_sem, &val); assert(val == 0);
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c[i].func= NULL;
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if(ret) ret[i]= c[i].ret;
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}
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return 0;
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}
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int avcodec_thread_init(AVCodecContext *s, int thread_count){
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int i;
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ThreadContext *c;
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s->thread_count= thread_count;
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assert(!s->thread_opaque);
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c= av_mallocz(sizeof(ThreadContext)*thread_count);
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s->thread_opaque= c;
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for(i=0; i<thread_count; i++){
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//printf("init semaphors %d\n", i); fflush(stdout);
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c[i].avctx= s;
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if(sem_init(&c[i].work_sem, 0, 0))
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goto fail;
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if(sem_init(&c[i].done_sem, 0, 0))
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goto fail;
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//printf("create thread %d\n", i); fflush(stdout);
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if(pthread_create(&c[i].thread, NULL, thread_func, &c[i]))
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goto fail;
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}
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//printf("init done\n"); fflush(stdout);
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s->execute= avcodec_thread_execute;
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return 0;
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fail:
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avcodec_thread_free(s);
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return -1;
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}
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