1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
/*
* Copyright (c) 2015 Nicolas George
*
* 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
*/
#include "libavutil/opt.h"
#include "libavutil/time.h"
#include "avfilter.h"
#include "internal.h"
#include <float.h>
typedef struct RealtimeContext {
const AVClass *class;
int64_t delta;
int64_t limit;
double speed;
unsigned inited;
} RealtimeContext;
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
AVFilterContext *ctx = inlink->dst;
RealtimeContext *s = ctx->priv;
if (frame->pts != AV_NOPTS_VALUE) {
int64_t pts = av_rescale_q(frame->pts, inlink->time_base, AV_TIME_BASE_Q) / s->speed;
int64_t now = av_gettime_relative();
int64_t sleep = pts - now + s->delta;
if (!s->inited) {
s->inited = 1;
sleep = 0;
s->delta = now - pts;
}
if (FFABS(sleep) > s->limit / s->speed) {
av_log(ctx, AV_LOG_WARNING,
"time discontinuity detected: %"PRIi64" us, resetting\n",
sleep);
sleep = 0;
s->delta = now - pts;
}
if (sleep > 0) {
av_log(ctx, AV_LOG_DEBUG, "sleeping %"PRIi64" us\n", sleep);
for (; sleep > 600000000; sleep -= 600000000)
av_usleep(600000000);
av_usleep(sleep);
}
}
return ff_filter_frame(inlink->dst->outputs[0], frame);
}
#define OFFSET(x) offsetof(RealtimeContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
static const AVOption options[] = {
{ "limit", "sleep time limit", OFFSET(limit), AV_OPT_TYPE_DURATION, { .i64 = 2000000 }, 0, INT64_MAX, FLAGS },
{ "speed", "speed factor", OFFSET(speed), AV_OPT_TYPE_DOUBLE, { .dbl = 1.0 }, DBL_MIN, DBL_MAX, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS_EXT(realtime, "(a)realtime", options);
#if CONFIG_REALTIME_FILTER
static const AVFilterPad avfilter_vf_realtime_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
};
static const AVFilterPad avfilter_vf_realtime_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
};
const AVFilter ff_vf_realtime = {
.name = "realtime",
.description = NULL_IF_CONFIG_SMALL("Slow down filtering to match realtime."),
.priv_size = sizeof(RealtimeContext),
.priv_class = &realtime_class,
.flags = AVFILTER_FLAG_METADATA_ONLY,
FILTER_INPUTS(avfilter_vf_realtime_inputs),
FILTER_OUTPUTS(avfilter_vf_realtime_outputs),
};
#endif /* CONFIG_REALTIME_FILTER */
#if CONFIG_AREALTIME_FILTER
static const AVFilterPad arealtime_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.filter_frame = filter_frame,
},
};
static const AVFilterPad arealtime_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
},
};
const AVFilter ff_af_arealtime = {
.name = "arealtime",
.description = NULL_IF_CONFIG_SMALL("Slow down filtering to match realtime."),
.priv_class = &realtime_class,
.priv_size = sizeof(RealtimeContext),
.flags = AVFILTER_FLAG_METADATA_ONLY,
FILTER_INPUTS(arealtime_inputs),
FILTER_OUTPUTS(arealtime_outputs),
};
#endif /* CONFIG_AREALTIME_FILTER */
|
