/* * 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 <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 do not 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, int size){ 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= (char*)arg + i*size; 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; if (thread_count <= 1) return 0; 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); }