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* Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
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* This file is part of Libav.
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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#define WIN32_LEAN_AND_MEAN
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typedef struct ThreadContext{
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AVCodecContext *avctx;
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int (*func)(AVCodecContext *c, void *arg);
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int (*func2)(AVCodecContext *c, void *arg, int, int);
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static unsigned WINAPI attribute_align_arg thread_func(void *v){
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//printf("thread_func %X enter wait\n", (int)v); fflush(stdout);
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WaitForSingleObject(c->work_sem, INFINITE);
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// avoid trying to access jobnr if we should quit
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if (!c->func && !c->func2)
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WaitForSingleObject(c->job_sem, INFINITE);
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jobnr = (*c->jobnr)++;
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ReleaseSemaphore(c->job_sem, 1, 0);
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//printf("thread_func %X after wait (func=%X)\n", (int)v, (int)c->func); fflush(stdout);
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ret= c->func(c->avctx, (uint8_t *)c->arg + jobnr*c->argsize);
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ret= c->func2(c->avctx, c->arg, jobnr, c->threadnr);
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//printf("thread_func %X signal complete\n", (int)v); fflush(stdout);
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ReleaseSemaphore(c->done_sem, 1, 0);
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* Free what has been allocated by ff_thread_init().
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* Must be called after decoding has finished, especially do not call while avcodec_thread_execute() is running.
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void ff_thread_free(AVCodecContext *s){
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ThreadContext *c= s->thread_opaque;
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for(i=0; i<s->thread_count; i++){
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ReleaseSemaphore(c[0].work_sem, s->thread_count, 0);
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for(i=0; i<s->thread_count; i++){
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WaitForSingleObject(c[i].thread, INFINITE);
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if(c[i].thread) CloseHandle(c[i].thread);
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if(c[0].work_sem) CloseHandle(c[0].work_sem);
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if(c[0].job_sem) CloseHandle(c[0].job_sem);
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if(c[0].done_sem) CloseHandle(c[0].done_sem);
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av_freep(&s->thread_opaque);
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static int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size){
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ThreadContext *c= s->thread_opaque;
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assert(s == c->avctx);
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/* note, we can be certain that this is not called with the same AVCodecContext by different threads at the same time */
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for(i=0; i<s->thread_count; i++){
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ReleaseSemaphore(c[0].work_sem, count, 0);
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for(i=0; i<count; i++)
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WaitForSingleObject(c[0].done_sem, INFINITE);
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static int avcodec_thread_execute2(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count){
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ThreadContext *c= s->thread_opaque;
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for(i=0; i<s->thread_count; i++)
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avcodec_thread_execute(s, NULL, arg, ret, count, 0);
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int ff_thread_init(AVCodecContext *s){
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if(!(s->thread_type & FF_THREAD_SLICE)){
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av_log(s, AV_LOG_WARNING, "The requested thread algorithm is not supported with this thread library.\n");
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s->active_thread_type= FF_THREAD_SLICE;
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if (s->thread_count <= 1)
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assert(!s->thread_opaque);
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c= av_mallocz(sizeof(ThreadContext)*s->thread_count);
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if(!(c[0].work_sem = CreateSemaphore(NULL, 0, INT_MAX, NULL)))
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if(!(c[0].job_sem = CreateSemaphore(NULL, 1, 1, NULL)))
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if(!(c[0].done_sem = CreateSemaphore(NULL, 0, INT_MAX, NULL)))
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for(i=0; i<s->thread_count; i++){
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//printf("init semaphors %d\n", i); fflush(stdout);
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c[i].work_sem = c[0].work_sem;
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c[i].job_sem = c[0].job_sem;
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c[i].done_sem = c[0].done_sem;
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//printf("create thread %d\n", i); fflush(stdout);
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c[i].thread = (HANDLE)_beginthreadex(NULL, 0, thread_func, &c[i], 0, &threadid );
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if( !c[i].thread ) goto fail;
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//printf("init done\n"); fflush(stdout);
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s->execute= avcodec_thread_execute;
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s->execute2= avcodec_thread_execute2;