mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-09-09 01:07:01 +02:00
181 lines
4.6 KiB
C
181 lines
4.6 KiB
C
/*
|
|
* Copyright (c) 2004 François Revol <revol@free.fr>
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
//#define DEBUG
|
|
|
|
#include "avcodec.h"
|
|
#include "common.h"
|
|
|
|
#include <OS.h>
|
|
|
|
typedef struct ThreadContext{
|
|
AVCodecContext *avctx;
|
|
thread_id thread;
|
|
sem_id work_sem;
|
|
sem_id done_sem;
|
|
int (*func)(AVCodecContext *c, void *arg);
|
|
void *arg;
|
|
int ret;
|
|
}ThreadContext;
|
|
|
|
// it's odd Be never patented that :D
|
|
struct benaphore {
|
|
vint32 atom;
|
|
sem_id sem;
|
|
};
|
|
static inline int lock_ben(struct benaphore *ben)
|
|
{
|
|
if (atomic_add(&ben->atom, 1) > 0)
|
|
return acquire_sem(ben->sem);
|
|
return B_OK;
|
|
}
|
|
static inline int unlock_ben(struct benaphore *ben)
|
|
{
|
|
if (atomic_add(&ben->atom, -1) > 1)
|
|
return release_sem(ben->sem);
|
|
return B_OK;
|
|
}
|
|
|
|
static struct benaphore av_thread_lib_ben;
|
|
|
|
static int32 ff_thread_func(void *v){
|
|
ThreadContext *c= v;
|
|
|
|
for(;;){
|
|
//printf("thread_func %X enter wait\n", (int)v); fflush(stdout);
|
|
acquire_sem(c->work_sem);
|
|
//printf("thread_func %X after wait (func=%X)\n", (int)v, (int)c->func); fflush(stdout);
|
|
if(c->func)
|
|
c->ret= c->func(c->avctx, c->arg);
|
|
else
|
|
return 0;
|
|
//printf("thread_func %X signal complete\n", (int)v); fflush(stdout);
|
|
release_sem(c->done_sem);
|
|
}
|
|
|
|
return B_OK;
|
|
}
|
|
|
|
/**
|
|
* free what has been allocated by avcodec_thread_init().
|
|
* must be called after decoding has finished, especially dont call while avcodec_thread_execute() is running
|
|
*/
|
|
void avcodec_thread_free(AVCodecContext *s){
|
|
ThreadContext *c= s->thread_opaque;
|
|
int i;
|
|
int32 ret;
|
|
|
|
for(i=0; i<s->thread_count; i++){
|
|
|
|
c[i].func= NULL;
|
|
release_sem(c[i].work_sem);
|
|
wait_for_thread(c[i].thread, &ret);
|
|
if(c[i].work_sem > B_OK) delete_sem(c[i].work_sem);
|
|
if(c[i].done_sem > B_OK) delete_sem(c[i].done_sem);
|
|
}
|
|
|
|
av_freep(&s->thread_opaque);
|
|
}
|
|
|
|
int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count){
|
|
ThreadContext *c= s->thread_opaque;
|
|
int i;
|
|
|
|
assert(s == c->avctx);
|
|
assert(count <= s->thread_count);
|
|
|
|
/* note, we can be certain that this is not called with the same AVCodecContext by different threads at the same time */
|
|
|
|
for(i=0; i<count; i++){
|
|
c[i].arg= arg[i];
|
|
c[i].func= func;
|
|
c[i].ret= 12345;
|
|
|
|
release_sem(c[i].work_sem);
|
|
}
|
|
for(i=0; i<count; i++){
|
|
acquire_sem(c[i].done_sem);
|
|
|
|
c[i].func= NULL;
|
|
if(ret) ret[i]= c[i].ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int avcodec_thread_init(AVCodecContext *s, int thread_count){
|
|
int i;
|
|
ThreadContext *c;
|
|
|
|
s->thread_count= thread_count;
|
|
|
|
assert(!s->thread_opaque);
|
|
c= av_mallocz(sizeof(ThreadContext)*thread_count);
|
|
s->thread_opaque= c;
|
|
|
|
for(i=0; i<thread_count; i++){
|
|
//printf("init semaphors %d\n", i); fflush(stdout);
|
|
c[i].avctx= s;
|
|
|
|
if((c[i].work_sem = create_sem(0, "ff work sem")) < B_OK)
|
|
goto fail;
|
|
if((c[i].done_sem = create_sem(0, "ff done sem")) < B_OK)
|
|
goto fail;
|
|
|
|
//printf("create thread %d\n", i); fflush(stdout);
|
|
c[i].thread = spawn_thread(ff_thread_func, "libavcodec thread", B_LOW_PRIORITY, &c[i] );
|
|
if( c[i].thread < B_OK ) goto fail;
|
|
resume_thread(c[i].thread );
|
|
}
|
|
//printf("init done\n"); fflush(stdout);
|
|
|
|
s->execute= avcodec_thread_execute;
|
|
|
|
return 0;
|
|
fail:
|
|
avcodec_thread_free(s);
|
|
return -1;
|
|
}
|
|
|
|
/* provide a mean to serialize calls to avcodec_*() for thread safety. */
|
|
|
|
int avcodec_thread_lock_lib(void)
|
|
{
|
|
return lock_ben(&av_thread_lib_ben);
|
|
}
|
|
|
|
int avcodec_thread_unlock_lib(void)
|
|
{
|
|
return unlock_ben(&av_thread_lib_ben);
|
|
}
|
|
|
|
/* our versions of _init and _fini (which are called by those actually from crt.o) */
|
|
|
|
void initialize_after(void)
|
|
{
|
|
av_thread_lib_ben.atom = 0;
|
|
av_thread_lib_ben.sem = create_sem(0, "libavcodec benaphore");
|
|
}
|
|
|
|
void uninitialize_before(void)
|
|
{
|
|
delete_sem(av_thread_lib_ben.sem);
|
|
}
|
|
|
|
|
|
|