Add pad filter.
[libav.git] / libavfilter / vf_aspect.c
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1/*
2 * Aspect ratio modification video filter
3 * Copyright (c) 2010 Bobby Bingham
4
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/**
ba87f080 23 * @file
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24 * aspect ratio modification video filter
25 */
26
27#include "avfilter.h"
28
29typedef struct {
30 AVRational aspect;
31} AspectContext;
32
33static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
34{
35 AspectContext *aspect = ctx->priv;
36 double ratio;
37 int64_t gcd;
38
39 if(args) {
40 if(sscanf(args, "%d:%d", &aspect->aspect.num, &aspect->aspect.den) < 2) {
41 if(sscanf(args, "%lf", &ratio) < 1)
42 return -1;
43 aspect->aspect = av_d2q(ratio, 100);
44 } else {
45 gcd = av_gcd(FFABS(aspect->aspect.num), FFABS(aspect->aspect.den));
46 if(gcd) {
47 aspect->aspect.num /= gcd;
48 aspect->aspect.den /= gcd;
49 }
50 }
51 }
52
53 if(aspect->aspect.den == 0)
54 aspect->aspect = (AVRational) {0, 1};
55
56 return 0;
57}
58
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59static void start_frame(AVFilterLink *link, AVFilterPicRef *picref)
60{
61 AspectContext *aspect = link->dst->priv;
62
63 picref->pixel_aspect = aspect->aspect;
64 avfilter_start_frame(link->dst->outputs[0], picref);
65}
66
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67#if CONFIG_ASPECT_FILTER
68/* for aspect filter, convert from frame aspect ratio to pixel aspect ratio */
69static int frameaspect_config_props(AVFilterLink *inlink)
70{
71 AspectContext *aspect = inlink->dst->priv;
72
73 av_reduce(&aspect->aspect.num, &aspect->aspect.den,
74 aspect->aspect.num * inlink->h,
75 aspect->aspect.den * inlink->w, 100);
76
77 return 0;
78}
79
80AVFilter avfilter_vf_aspect = {
81 .name = "aspect",
82 .description = NULL_IF_CONFIG_SMALL("Set the frame aspect ratio."),
83
84 .init = init,
85
86 .priv_size = sizeof(AspectContext),
87
88 .inputs = (AVFilterPad[]) {{ .name = "default",
72415b2a 89 .type = AVMEDIA_TYPE_VIDEO,
3922deb5 90 .config_props = frameaspect_config_props,
d313e17a 91 .get_video_buffer = avfilter_null_get_video_buffer,
3922deb5 92 .start_frame = start_frame,
d313e17a 93 .end_frame = avfilter_null_end_frame },
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94 { .name = NULL}},
95
96 .outputs = (AVFilterPad[]) {{ .name = "default",
72415b2a 97 .type = AVMEDIA_TYPE_VIDEO, },
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98 { .name = NULL}},
99};
100#endif /* CONFIG_ASPECT_FILTER */
101
102#if CONFIG_PIXELASPECT_FILTER
103AVFilter avfilter_vf_pixelaspect = {
104 .name = "pixelaspect",
105 .description = NULL_IF_CONFIG_SMALL("Set the pixel aspect ratio."),
106
107 .init = init,
108
109 .priv_size = sizeof(AspectContext),
110
111 .inputs = (AVFilterPad[]) {{ .name = "default",
72415b2a 112 .type = AVMEDIA_TYPE_VIDEO,
d313e17a 113 .get_video_buffer = avfilter_null_get_video_buffer,
3922deb5 114 .start_frame = start_frame,
d313e17a 115 .end_frame = avfilter_null_end_frame },
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116 { .name = NULL}},
117
118 .outputs = (AVFilterPad[]) {{ .name = "default",
72415b2a 119 .type = AVMEDIA_TYPE_VIDEO, },
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120 { .name = NULL}},
121};
122#endif /* CONFIG_PIXELASPECT_FILTER */
123