1/* 2 * Copyright (c) 2004 Fran��ois Revol <revol@free.fr> 3 * 4 * This file is part of FFmpeg. 5 * 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. 10 * 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. 15 * 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 19 */ 20//#define DEBUG 21 22#include "avcodec.h" 23 24#include <OS.h> 25 26typedef struct ThreadContext{ 27 AVCodecContext *avctx; 28 thread_id thread; 29 sem_id work_sem; 30 sem_id done_sem; 31 int (*func)(AVCodecContext *c, void *arg); 32 void *arg; 33 int ret; 34}ThreadContext; 35 36// it's odd Be never patented that :D 37struct benaphore { 38 vint32 atom; 39 sem_id sem; 40}; 41static inline int lock_ben(struct benaphore *ben) 42{ 43 if (atomic_add(&ben->atom, 1) > 0) 44 return acquire_sem(ben->sem); 45 return B_OK; 46} 47static inline int unlock_ben(struct benaphore *ben) 48{ 49 if (atomic_add(&ben->atom, -1) > 1) 50 return release_sem(ben->sem); 51 return B_OK; 52} 53 54static struct benaphore av_thread_lib_ben; 55 56static int32 ff_thread_func(void *v){ 57 ThreadContext *c= v; 58 59 for(;;){ 60//printf("thread_func %X enter wait\n", (int)v); fflush(stdout); 61 acquire_sem(c->work_sem); 62//printf("thread_func %X after wait (func=%X)\n", (int)v, (int)c->func); fflush(stdout); 63 if(c->func) 64 c->ret= c->func(c->avctx, c->arg); 65 else 66 return 0; 67//printf("thread_func %X signal complete\n", (int)v); fflush(stdout); 68 release_sem(c->done_sem); 69 } 70 71 return B_OK; 72} 73 74/** 75 * Free what has been allocated by avcodec_thread_init(). 76 * Must be called after decoding has finished, especially do not call while avcodec_thread_execute() is running. 77 */ 78void avcodec_thread_free(AVCodecContext *s){ 79 ThreadContext *c= s->thread_opaque; 80 int i; 81 int32 ret; 82 83 for(i=0; i<s->thread_count; i++){ 84 85 c[i].func= NULL; 86 release_sem(c[i].work_sem); 87 wait_for_thread(c[i].thread, &ret); 88 if(c[i].work_sem > B_OK) delete_sem(c[i].work_sem); 89 if(c[i].done_sem > B_OK) delete_sem(c[i].done_sem); 90 } 91 92 av_freep(&s->thread_opaque); 93} 94 95static int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size){ 96 ThreadContext *c= s->thread_opaque; 97 int i; 98 99 assert(s == c->avctx); 100 assert(count <= s->thread_count); 101 102 /* note, we can be certain that this is not called with the same AVCodecContext by different threads at the same time */ 103 104 for(i=0; i<count; i++){ 105 c[i].arg= (char*)arg + i*size; 106 c[i].func= func; 107 c[i].ret= 12345; 108 109 release_sem(c[i].work_sem); 110 } 111 for(i=0; i<count; i++){ 112 acquire_sem(c[i].done_sem); 113 114 c[i].func= NULL; 115 if(ret) ret[i]= c[i].ret; 116 } 117 return 0; 118} 119 120int avcodec_thread_init(AVCodecContext *s, int thread_count){ 121 int i; 122 ThreadContext *c; 123 124 s->thread_count= thread_count; 125 126 if (thread_count <= 1) 127 return 0; 128 129 assert(!s->thread_opaque); 130 c= av_mallocz(sizeof(ThreadContext)*thread_count); 131 s->thread_opaque= c; 132 133 for(i=0; i<thread_count; i++){ 134//printf("init semaphors %d\n", i); fflush(stdout); 135 c[i].avctx= s; 136 137 if((c[i].work_sem = create_sem(0, "ff work sem")) < B_OK) 138 goto fail; 139 if((c[i].done_sem = create_sem(0, "ff done sem")) < B_OK) 140 goto fail; 141 142//printf("create thread %d\n", i); fflush(stdout); 143 c[i].thread = spawn_thread(ff_thread_func, "libavcodec thread", B_LOW_PRIORITY, &c[i] ); 144 if( c[i].thread < B_OK ) goto fail; 145 resume_thread(c[i].thread ); 146 } 147//printf("init done\n"); fflush(stdout); 148 149 s->execute= avcodec_thread_execute; 150 151 return 0; 152fail: 153 avcodec_thread_free(s); 154 return -1; 155} 156 157/* provide a mean to serialize calls to avcodec_*() for thread safety. */ 158 159int avcodec_thread_lock_lib(void) 160{ 161 return lock_ben(&av_thread_lib_ben); 162} 163 164int avcodec_thread_unlock_lib(void) 165{ 166 return unlock_ben(&av_thread_lib_ben); 167} 168 169/* our versions of _init and _fini (which are called by those actually from crt.o) */ 170 171void initialize_after(void) 172{ 173 av_thread_lib_ben.atom = 0; 174 av_thread_lib_ben.sem = create_sem(0, "libavcodec benaphore"); 175} 176 177void uninitialize_before(void) 178{ 179 delete_sem(av_thread_lib_ben.sem); 180} 181 182 183 184