mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-26 01:02:33 +00:00
22b72de04b
Benchmark (with 2 cpus):
./ffmpeg -f rawvideo -s 1280x720 -t 1000 -i /dev/zero \
-filter_threads $threads -vf transpose=clock -f null null
threads=2:
old: 31.129s 31.446s 31.574s
new: 29.602s 29.636s 29.656s
threads=3 (nb_threads = nb_cpus + 1 is bad choice at this situation):
old: 40.132s 40.279s 40.279s
new: 39.308s 39.570s 39.693s
threads=4:
old: 31.306s 31.366s 31.654s
new: 30.231s 30.360s 30.451s
Signed-off-by: Muhammad Faiz <mfcc64@gmail.com>
121 lines
3.1 KiB
C
121 lines
3.1 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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*
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* FFmpeg 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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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; 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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*/
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/**
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* @file
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* Libavfilter multithreading support
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*/
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#include "config.h"
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#include "libavutil/common.h"
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#include "libavutil/cpu.h"
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#include "libavutil/mem.h"
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#include "libavutil/thread.h"
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#include "libavutil/slicethread.h"
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#include "avfilter.h"
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#include "internal.h"
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#include "thread.h"
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typedef struct ThreadContext {
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AVFilterGraph *graph;
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AVSliceThread *thread;
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avfilter_action_func *func;
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/* per-execute parameters */
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AVFilterContext *ctx;
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void *arg;
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int *rets;
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} ThreadContext;
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static void worker_func(void *priv, int jobnr, int threadnr, int nb_jobs, int nb_threads)
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{
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ThreadContext *c = priv;
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int ret = c->func(c->ctx, c->arg, jobnr, nb_jobs);
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if (c->rets)
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c->rets[jobnr] = ret;
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}
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static void slice_thread_uninit(ThreadContext *c)
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{
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avpriv_slicethread_free(&c->thread);
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}
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static int thread_execute(AVFilterContext *ctx, avfilter_action_func *func,
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void *arg, int *ret, int nb_jobs)
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{
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ThreadContext *c = ctx->graph->internal->thread;
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if (nb_jobs <= 0)
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return 0;
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c->ctx = ctx;
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c->arg = arg;
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c->func = func;
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c->rets = ret;
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avpriv_slicethread_execute(c->thread, nb_jobs, 0);
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return 0;
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}
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static int thread_init_internal(ThreadContext *c, int nb_threads)
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{
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nb_threads = avpriv_slicethread_create(&c->thread, c, worker_func, NULL, nb_threads);
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if (nb_threads <= 1)
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avpriv_slicethread_free(&c->thread);
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return FFMAX(nb_threads, 1);
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}
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int ff_graph_thread_init(AVFilterGraph *graph)
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{
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int ret;
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#if HAVE_W32THREADS
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w32thread_init();
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#endif
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if (graph->nb_threads == 1) {
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graph->thread_type = 0;
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return 0;
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}
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graph->internal->thread = av_mallocz(sizeof(ThreadContext));
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if (!graph->internal->thread)
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return AVERROR(ENOMEM);
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ret = thread_init_internal(graph->internal->thread, graph->nb_threads);
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if (ret <= 1) {
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av_freep(&graph->internal->thread);
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graph->thread_type = 0;
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graph->nb_threads = 1;
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return (ret < 0) ? ret : 0;
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}
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graph->nb_threads = ret;
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graph->internal->thread_execute = thread_execute;
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return 0;
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}
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void ff_graph_thread_free(AVFilterGraph *graph)
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{
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if (graph->internal->thread)
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slice_thread_uninit(graph->internal->thread);
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av_freep(&graph->internal->thread);
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}
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