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/*
* 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
*/
/**
* @file
* Libavfilter multithreading support
*/
#include "config.h"
#include "libavutil/common.h"
#include "libavutil/cpu.h"
#include "libavutil/mem.h"
#include "libavutil/thread.h"
#include "libavutil/slicethread.h"
#include "avfilter.h"
#include "internal.h"
#include "thread.h"
typedef struct ThreadContext {
AVFilterGraph *graph;
AVSliceThread *thread;
avfilter_action_func *func;
/* per-execute parameters */
AVFilterContext *ctx;
void *arg;
int *rets;
} ThreadContext;
static void worker_func(void *priv, int jobnr, int threadnr, int nb_jobs, int nb_threads)
{
ThreadContext *c = priv;
int ret = c->func(c->ctx, c->arg, jobnr, nb_jobs);
if (c->rets)
c->rets[jobnr] = ret;
}
static void slice_thread_uninit(ThreadContext *c)
{
avpriv_slicethread_free(&c->thread);
}
static int thread_execute(AVFilterContext *ctx, avfilter_action_func *func,
void *arg, int *ret, int nb_jobs)
{
ThreadContext *c = ctx->graph->internal->thread;
if (nb_jobs <= 0)
return 0;
c->ctx = ctx;
c->arg = arg;
c->func = func;
c->rets = ret;
avpriv_slicethread_execute(c->thread, nb_jobs, 0);
return 0;
}
static int thread_init_internal(ThreadContext *c, int nb_threads)
{
nb_threads = avpriv_slicethread_create(&c->thread, c, worker_func, NULL, nb_threads);
if (nb_threads <= 1)
avpriv_slicethread_free(&c->thread);
return FFMAX(nb_threads, 1);
}
int ff_graph_thread_init(AVFilterGraph *graph)
{
int ret;
#if HAVE_W32THREADS
w32thread_init();
#endif
if (graph->nb_threads == 1) {
graph->thread_type = 0;
return 0;
}
graph->internal->thread = av_mallocz(sizeof(ThreadContext));
if (!graph->internal->thread)
return AVERROR(ENOMEM);
ret = thread_init_internal(graph->internal->thread, graph->nb_threads);
if (ret <= 1) {
av_freep(&graph->internal->thread);
graph->thread_type = 0;
graph->nb_threads = 1;
return (ret < 0) ? ret : 0;
}
graph->nb_threads = ret;
graph->internal->thread_execute = thread_execute;
return 0;
}
void ff_graph_thread_free(AVFilterGraph *graph)
{
if (graph->internal->thread)
slice_thread_uninit(graph->internal->thread);
av_freep(&graph->internal->thread);
}
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