2 * Copyright (c) 2007 Bobby Bingham
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
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.
11 * FFmpeg is distributed in the hope that it will be useful,
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.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * video vertical flip filter
26 #include "libavutil/internal.h"
27 #include "libavutil/pixdesc.h"
33 int vsub; ///< vertical chroma subsampling
36 static int config_input(AVFilterLink *link)
38 FlipContext *flip = link->dst->priv;
39 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
41 flip->vsub = desc->log2_chroma_h;
46 static AVFrame *get_video_buffer(AVFilterLink *link, int w, int h)
48 FlipContext *flip = link->dst->priv;
52 frame = ff_get_video_buffer(link->dst->outputs[0], w, h);
56 for (i = 0; i < 4; i ++) {
57 int vsub = i == 1 || i == 2 ? flip->vsub : 0;
60 frame->data[i] += (((h + (1<<vsub) - 1) >> vsub) - 1) * frame->linesize[i];
61 frame->linesize[i] = -frame->linesize[i];
68 static int filter_frame(AVFilterLink *link, AVFrame *frame)
70 FlipContext *flip = link->dst->priv;
73 for (i = 0; i < 4; i ++) {
74 int vsub = i == 1 || i == 2 ? flip->vsub : 0;
77 frame->data[i] += (((link->h + (1<<vsub)-1)>> vsub)-1) * frame->linesize[i];
78 frame->linesize[i] = -frame->linesize[i];
82 return ff_filter_frame(link->dst->outputs[0], frame);
84 static const AVFilterPad avfilter_vf_vflip_inputs[] = {
87 .type = AVMEDIA_TYPE_VIDEO,
88 .get_video_buffer = get_video_buffer,
89 .filter_frame = filter_frame,
90 .config_props = config_input,
95 static const AVFilterPad avfilter_vf_vflip_outputs[] = {
98 .type = AVMEDIA_TYPE_VIDEO,
103 AVFilter avfilter_vf_vflip = {
105 .description = NULL_IF_CONFIG_SMALL("Flip the input video vertically."),
107 .priv_size = sizeof(FlipContext),
109 .inputs = avfilter_vf_vflip_inputs,
110 .outputs = avfilter_vf_vflip_outputs,