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
|
/*
* Copyright (c) 2010 Bobby Bingham
* 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
* aspect ratio modification video filters
*/
#include "avfilter.h"
typedef struct {
AVRational aspect;
} AspectContext;
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
{
AspectContext *aspect = ctx->priv;
double ratio;
int64_t gcd;
char c = 0;
if (args) {
if (sscanf(args, "%d:%d%c", &aspect->aspect.num, &aspect->aspect.den, &c) != 2)
if (sscanf(args, "%lf%c", &ratio, &c) == 1)
aspect->aspect = av_d2q(ratio, 100);
if (c || aspect->aspect.num <= 0 || aspect->aspect.den <= 0) {
av_log(ctx, AV_LOG_ERROR,
"Invalid string '%s' for aspect ratio.\n", args);
return AVERROR(EINVAL);
}
gcd = av_gcd(FFABS(aspect->aspect.num), FFABS(aspect->aspect.den));
if (gcd) {
aspect->aspect.num /= gcd;
aspect->aspect.den /= gcd;
}
}
if (aspect->aspect.den == 0)
aspect->aspect = (AVRational) {0, 1};
av_log(ctx, AV_LOG_INFO, "a:%d/%d\n", aspect->aspect.num, aspect->aspect.den);
return 0;
}
static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
{
AspectContext *aspect = link->dst->priv;
picref->video->pixel_aspect = aspect->aspect;
avfilter_start_frame(link->dst->outputs[0], picref);
}
#if CONFIG_SETDAR_FILTER
/* for setdar filter, convert from frame aspect ratio to pixel aspect ratio */
static int setdar_config_props(AVFilterLink *inlink)
{
AspectContext *aspect = inlink->dst->priv;
AVRational dar = aspect->aspect;
av_reduce(&aspect->aspect.num, &aspect->aspect.den,
aspect->aspect.num * inlink->h,
aspect->aspect.den * inlink->w, 100);
av_log(inlink->dst, AV_LOG_INFO, "w:%d h:%d -> dar:%d/%d par:%d/%d\n",
inlink->w, inlink->h, dar.num, dar.den, aspect->aspect.num, aspect->aspect.den);
inlink->sample_aspect_ratio = aspect->aspect;
return 0;
}
AVFilter avfilter_vf_setdar = {
.name = "setdar",
.description = NULL_IF_CONFIG_SMALL("Set the frame display aspect ratio."),
.init = init,
.priv_size = sizeof(AspectContext),
.inputs = (AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = setdar_config_props,
.get_video_buffer = avfilter_null_get_video_buffer,
.start_frame = start_frame,
.end_frame = avfilter_null_end_frame },
{ .name = NULL}},
.outputs = (AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO, },
{ .name = NULL}},
};
#endif /* CONFIG_SETDAR_FILTER */
#if CONFIG_SETSAR_FILTER
/* for setdar filter, convert from frame aspect ratio to pixel aspect ratio */
static int setsar_config_props(AVFilterLink *inlink)
{
AspectContext *aspect = inlink->dst->priv;
inlink->sample_aspect_ratio = aspect->aspect;
return 0;
}
AVFilter avfilter_vf_setsar = {
.name = "setsar",
.description = NULL_IF_CONFIG_SMALL("Set the pixel sample aspect ratio."),
.init = init,
.priv_size = sizeof(AspectContext),
.inputs = (AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = setsar_config_props,
.get_video_buffer = avfilter_null_get_video_buffer,
.start_frame = start_frame,
.end_frame = avfilter_null_end_frame },
{ .name = NULL}},
.outputs = (AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO, },
{ .name = NULL}},
};
#endif /* CONFIG_SETSAR_FILTER */
|
