| /* |
| * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at> |
| * |
| * 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" |
| |
| #define WIN32_LEAN_AND_MEAN |
| #include <windows.h> |
| #include <process.h> |
| |
| typedef struct ThreadContext{ |
| AVCodecContext *avctx; |
| HANDLE thread; |
| HANDLE work_sem; |
| HANDLE done_sem; |
| int (*func)(AVCodecContext *c, void *arg); |
| void *arg; |
| int ret; |
| }ThreadContext; |
| |
| |
| static unsigned WINAPI attribute_align_arg thread_func(void *v){ |
| ThreadContext *c= v; |
| |
| for(;;){ |
| //printf("thread_func %X enter wait\n", (int)v); fflush(stdout); |
| WaitForSingleObject(c->work_sem, INFINITE); |
| //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); |
| ReleaseSemaphore(c->done_sem, 1, 0); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * 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; |
| |
| for(i=0; i<s->thread_count; i++){ |
| |
| c[i].func= NULL; |
| ReleaseSemaphore(c[i].work_sem, 1, 0); |
| WaitForSingleObject(c[i].thread, INFINITE); |
| if(c[i].work_sem) CloseHandle(c[i].work_sem); |
| if(c[i].done_sem) CloseHandle(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; |
| |
| ReleaseSemaphore(c[i].work_sem, 1, 0); |
| } |
| for(i=0; i<count; i++){ |
| WaitForSingleObject(c[i].done_sem, INFINITE); |
| |
| 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; |
| uint32_t threadid; |
| |
| 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 = CreateSemaphore(NULL, 0, s->thread_count, NULL))) |
| goto fail; |
| if(!(c[i].done_sem = CreateSemaphore(NULL, 0, s->thread_count, NULL))) |
| goto fail; |
| |
| //printf("create thread %d\n", i); fflush(stdout); |
| c[i].thread = (HANDLE)_beginthreadex(NULL, 0, thread_func, &c[i], 0, &threadid ); |
| if( !c[i].thread ) goto fail; |
| } |
| //printf("init done\n"); fflush(stdout); |
| |
| s->execute= avcodec_thread_execute; |
| |
| return 0; |
| fail: |
| avcodec_thread_free(s); |
| return -1; |
| } |