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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
/*
* Copyright (c) 2018 Marton Balint
*
* 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 "filters.h"
#include "internal.h"
typedef struct CueContext {
const AVClass *class;
int64_t first_pts;
int64_t cue;
int64_t preroll;
int64_t buffer;
int status;
} CueContext;
static int activate(AVFilterContext *ctx)
{
AVFilterLink *inlink = ctx->inputs[0];
AVFilterLink *outlink = ctx->outputs[0];
CueContext *s = ctx->priv;
FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
if (ff_inlink_queued_frames(inlink)) {
AVFrame *frame = ff_inlink_peek_frame(inlink, 0);
int64_t pts = av_rescale_q(frame->pts, inlink->time_base, AV_TIME_BASE_Q);
if (!s->status) {
s->first_pts = pts;
s->status++;
}
if (s->status == 1) {
if (pts - s->first_pts < s->preroll) {
int ret = ff_inlink_consume_frame(inlink, &frame);
if (ret < 0)
return ret;
return ff_filter_frame(outlink, frame);
}
s->first_pts = pts;
s->status++;
}
if (s->status == 2) {
frame = ff_inlink_peek_frame(inlink, ff_inlink_queued_frames(inlink) - 1);
pts = av_rescale_q(frame->pts, inlink->time_base, AV_TIME_BASE_Q);
if (!(pts - s->first_pts < s->buffer && (av_gettime() - s->cue) < 0))
s->status++;
}
if (s->status == 3) {
int64_t diff;
while ((diff = (av_gettime() - s->cue)) < 0)
av_usleep(av_clip(-diff / 2, 100, 1000000));
s->status++;
}
if (s->status == 4) {
int ret = ff_inlink_consume_frame(inlink, &frame);
if (ret < 0)
return ret;
return ff_filter_frame(outlink, frame);
}
}
FF_FILTER_FORWARD_STATUS(inlink, outlink);
FF_FILTER_FORWARD_WANTED(outlink, inlink);
return FFERROR_NOT_READY;
}
#define OFFSET(x) offsetof(CueContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
static const AVOption options[] = {
{ "cue", "cue unix timestamp in microseconds", OFFSET(cue), AV_OPT_TYPE_INT64, { .i64 = 0 }, 0, INT64_MAX, FLAGS },
{ "preroll", "preroll duration in seconds", OFFSET(preroll), AV_OPT_TYPE_DURATION, { .i64 = 0 }, 0, INT64_MAX, FLAGS },
{ "buffer", "buffer duration in seconds", OFFSET(buffer), AV_OPT_TYPE_DURATION, { .i64 = 0 }, 0, INT64_MAX, FLAGS },
{ NULL }
};
#if CONFIG_CUE_FILTER
#define cue_options options
AVFILTER_DEFINE_CLASS(cue);
static const AVFilterPad cue_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
static const AVFilterPad cue_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
const AVFilter ff_vf_cue = {
.name = "cue",
.description = NULL_IF_CONFIG_SMALL("Delay filtering to match a cue."),
.priv_size = sizeof(CueContext),
.priv_class = &cue_class,
.inputs = cue_inputs,
.outputs = cue_outputs,
.activate = activate,
};
#endif /* CONFIG_CUE_FILTER */
#if CONFIG_ACUE_FILTER
#define acue_options options
AVFILTER_DEFINE_CLASS(acue);
static const AVFilterPad acue_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
},
{ NULL }
};
static const AVFilterPad acue_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
},
{ NULL }
};
const AVFilter ff_af_acue = {
.name = "acue",
.description = NULL_IF_CONFIG_SMALL("Delay filtering to match a cue."),
.priv_size = sizeof(CueContext),
.priv_class = &acue_class,
.inputs = acue_inputs,
.outputs = acue_outputs,
.activate = activate,
};
#endif /* CONFIG_ACUE_FILTER */
|
