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- /*
- * Copyright (c) 2004 François Revol <revol@free.fr>
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg 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 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg 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 FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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);
- }
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