/* * Copyright (c) 2004 Michael Niedermayer * * 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 "thread.h" #define WIN32_LEAN_AND_MEAN #include #include typedef struct ThreadContext{ AVCodecContext *avctx; HANDLE thread; HANDLE work_sem; HANDLE job_sem; HANDLE done_sem; int (*func)(AVCodecContext *c, void *arg); int (*func2)(AVCodecContext *c, void *arg, int, int); void *arg; int argsize; int *jobnr; int *ret; int threadnr; }ThreadContext; static unsigned WINAPI attribute_align_arg thread_func(void *v){ ThreadContext *c= v; for(;;){ int ret, jobnr; //printf("thread_func %X enter wait\n", (int)v); fflush(stdout); WaitForSingleObject(c->work_sem, INFINITE); // avoid trying to access jobnr if we should quit if (!c->func && !c->func2) break; WaitForSingleObject(c->job_sem, INFINITE); jobnr = (*c->jobnr)++; ReleaseSemaphore(c->job_sem, 1, 0); //printf("thread_func %X after wait (func=%X)\n", (int)v, (int)c->func); fflush(stdout); if(c->func) ret= c->func(c->avctx, (uint8_t *)c->arg + jobnr*c->argsize); else ret= c->func2(c->avctx, c->arg, jobnr, c->threadnr); if (c->ret) c->ret[jobnr] = ret; //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 ff_thread_init(). * Must be called after decoding has finished, especially do not call while avcodec_thread_execute() is running. */ void ff_thread_free(AVCodecContext *s){ ThreadContext *c= s->thread_opaque; int i; for(i=0; ithread_count; i++){ c[i].func= NULL; c[i].func2= NULL; } ReleaseSemaphore(c[0].work_sem, s->thread_count, 0); for(i=0; ithread_count; i++){ WaitForSingleObject(c[i].thread, INFINITE); if(c[i].thread) CloseHandle(c[i].thread); } if(c[0].work_sem) CloseHandle(c[0].work_sem); if(c[0].job_sem) CloseHandle(c[0].job_sem); if(c[0].done_sem) CloseHandle(c[0].done_sem); av_freep(&s->thread_opaque); } static 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; int jobnr = 0; assert(s == c->avctx); /* note, we can be certain that this is not called with the same AVCodecContext by different threads at the same time */ for(i=0; ithread_count; i++){ c[i].arg= arg; c[i].argsize= size; c[i].func= func; c[i].ret= ret; c[i].jobnr = &jobnr; } ReleaseSemaphore(c[0].work_sem, count, 0); for(i=0; ithread_opaque; int i; for(i=0; ithread_count; i++) c[i].func2 = func; avcodec_thread_execute(s, NULL, arg, ret, count, 0); } int ff_thread_init(AVCodecContext *s){ int i; ThreadContext *c; uint32_t threadid; if(!(s->thread_type & FF_THREAD_SLICE)){ av_log(s, AV_LOG_WARNING, "The requested thread algorithm is not supported with this thread library.\n"); return 0; } s->active_thread_type= FF_THREAD_SLICE; if (thread_count <= 1) return 0; assert(!s->thread_opaque); c= av_mallocz(sizeof(ThreadContext)*thread_count); s->thread_opaque= c; if(!(c[0].work_sem = CreateSemaphore(NULL, 0, INT_MAX, NULL))) goto fail; if(!(c[0].job_sem = CreateSemaphore(NULL, 1, 1, NULL))) goto fail; if(!(c[0].done_sem = CreateSemaphore(NULL, 0, INT_MAX, NULL))) goto fail; for(i=0; iexecute= avcodec_thread_execute; s->execute2= avcodec_thread_execute2; return 0; fail: ff_thread_free(s); return -1; }