1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 /**
20 * @file
21 * Libavfilter multithreading support
22 */
23
24 #include "config.h"
25
26 #include "libavutil/common.h"
27 #include "libavutil/cpu.h"
28 #include "libavutil/mem.h"
29 #include "libavutil/thread.h"
30 #include "libavutil/slicethread.h"
31
32 #include "avfilter.h"
33 #include "internal.h"
34 #include "thread.h"
35
36 typedef struct ThreadContext {
37 AVFilterGraph *graph;
38 AVSliceThread *thread;
39 avfilter_action_func *func;
40
41 /* per-execute parameters */
42 AVFilterContext *ctx;
43 void *arg;
44 int *rets;
45 } ThreadContext;
46
worker_func(void * priv,int jobnr,int threadnr,int nb_jobs,int nb_threads)47 static void worker_func(void *priv, int jobnr, int threadnr, int nb_jobs, int nb_threads)
48 {
49 ThreadContext *c = priv;
50 int ret = c->func(c->ctx, c->arg, jobnr, nb_jobs);
51 if (c->rets)
52 c->rets[jobnr] = ret;
53 }
54
slice_thread_uninit(ThreadContext * c)55 static void slice_thread_uninit(ThreadContext *c)
56 {
57 avpriv_slicethread_free(&c->thread);
58 }
59
thread_execute(AVFilterContext * ctx,avfilter_action_func * func,void * arg,int * ret,int nb_jobs)60 static int thread_execute(AVFilterContext *ctx, avfilter_action_func *func,
61 void *arg, int *ret, int nb_jobs)
62 {
63 ThreadContext *c = ctx->graph->internal->thread;
64
65 if (nb_jobs <= 0)
66 return 0;
67 c->ctx = ctx;
68 c->arg = arg;
69 c->func = func;
70 c->rets = ret;
71
72 avpriv_slicethread_execute(c->thread, nb_jobs, 0);
73 return 0;
74 }
75
thread_init_internal(ThreadContext * c,int nb_threads)76 static int thread_init_internal(ThreadContext *c, int nb_threads)
77 {
78 nb_threads = avpriv_slicethread_create(&c->thread, c, worker_func, NULL, nb_threads);
79 if (nb_threads <= 1)
80 avpriv_slicethread_free(&c->thread);
81 return FFMAX(nb_threads, 1);
82 }
83
ff_graph_thread_init(AVFilterGraph * graph)84 int ff_graph_thread_init(AVFilterGraph *graph)
85 {
86 int ret;
87
88 if (graph->nb_threads == 1) {
89 graph->thread_type = 0;
90 return 0;
91 }
92
93 graph->internal->thread = av_mallocz(sizeof(ThreadContext));
94 if (!graph->internal->thread)
95 return AVERROR(ENOMEM);
96
97 ret = thread_init_internal(graph->internal->thread, graph->nb_threads);
98 if (ret <= 1) {
99 av_freep(&graph->internal->thread);
100 graph->thread_type = 0;
101 graph->nb_threads = 1;
102 return (ret < 0) ? ret : 0;
103 }
104 graph->nb_threads = ret;
105
106 graph->internal->thread_execute = thread_execute;
107
108 return 0;
109 }
110
ff_graph_thread_free(AVFilterGraph * graph)111 void ff_graph_thread_free(AVFilterGraph *graph)
112 {
113 if (graph->internal->thread)
114 slice_thread_uninit(graph->internal->thread);
115 av_freep(&graph->internal->thread);
116 }
117