AVFrame: add side data.
[libav.git] / libavfilter / vf_vflip.c
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c38ae71f 1/*
3fa77bde 2 * Copyright (c) 2007 Bobby Bingham
c38ae71f 3 *
2912e87a 4 * This file is part of Libav.
c38ae71f 5 *
2912e87a 6 * Libav is free software; you can redistribute it and/or
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7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
2912e87a 11 * Libav is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
2912e87a 17 * License along with Libav; if not, write to the Free Software
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21/**
ba87f080 22 * @file
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23 * video vertical flip filter
24 */
25
1d9c2dc8 26#include "libavutil/internal.h"
b4b66456 27#include "libavutil/pixdesc.h"
c38ae71f 28#include "avfilter.h"
9d0bfc50 29#include "internal.h"
43c7a01e 30#include "video.h"
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31
32typedef struct {
33 int vsub; ///< vertical chroma subsampling
34} FlipContext;
35
36static int config_input(AVFilterLink *link)
37{
38 FlipContext *flip = link->dst->priv;
59ee9f78 39 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
c38ae71f 40
59ee9f78 41 flip->vsub = desc->log2_chroma_h;
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42
43 return 0;
44}
45
ecc8dada 46static AVFilterBufferRef *get_video_buffer(AVFilterLink *link, int perms,
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47 int w, int h)
48{
49 FlipContext *flip = link->dst->priv;
0ccabeea 50 AVFilterBufferRef *picref;
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51 int i;
52
0ccabeea 53 if (!(perms & AV_PERM_NEG_LINESIZES))
43c7a01e 54 return ff_default_get_video_buffer(link, perms, w, h);
c38ae71f 55
6d58358a 56 picref = ff_get_video_buffer(link->dst->outputs[0], perms, w, h);
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57 if (!picref)
58 return NULL;
59
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60 for (i = 0; i < 4; i ++) {
61 int vsub = i == 1 || i == 2 ? flip->vsub : 0;
62
c38ae71f 63 if (picref->data[i]) {
e87eb039 64 picref->data[i] += ((h >> vsub)-1) * picref->linesize[i];
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65 picref->linesize[i] = -picref->linesize[i];
66 }
67 }
68
69 return picref;
70}
71
565e4993 72static int filter_frame(AVFilterLink *link, AVFilterBufferRef *frame)
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73{
74 FlipContext *flip = link->dst->priv;
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75 int i;
76
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77 for (i = 0; i < 4; i ++) {
78 int vsub = i == 1 || i == 2 ? flip->vsub : 0;
79
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80 if (frame->data[i]) {
81 frame->data[i] += ((link->h >> vsub)-1) * frame->linesize[i];
82 frame->linesize[i] = -frame->linesize[i];
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83 }
84 }
85
565e4993 86 return ff_filter_frame(link->dst->outputs[0], frame);
c38ae71f 87}
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88static const AVFilterPad avfilter_vf_vflip_inputs[] = {
89 {
90 .name = "default",
91 .type = AVMEDIA_TYPE_VIDEO,
92 .get_video_buffer = get_video_buffer,
565e4993 93 .filter_frame = filter_frame,
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94 .config_props = config_input,
95 },
96 { NULL }
97};
98
99static const AVFilterPad avfilter_vf_vflip_outputs[] = {
100 {
101 .name = "default",
102 .type = AVMEDIA_TYPE_VIDEO,
103 },
104 { NULL }
105};
106
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107AVFilter avfilter_vf_vflip = {
108 .name = "vflip",
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109 .description = NULL_IF_CONFIG_SMALL("Flip the input video vertically."),
110
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111 .priv_size = sizeof(FlipContext),
112
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113 .inputs = avfilter_vf_vflip_inputs,
114 .outputs = avfilter_vf_vflip_outputs,
c38ae71f 115};