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https://github.com/FFmpeg/FFmpeg.git
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112 lines
2.9 KiB
C
112 lines
2.9 KiB
C
/*
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* Copyright (c) 2007 Bobby Bingham
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* video vertical flip filter
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*/
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#include "libavutil/internal.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "internal.h"
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#include "video.h"
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typedef struct FlipContext {
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int vsub; ///< vertical chroma subsampling
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} FlipContext;
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static int config_input(AVFilterLink *link)
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{
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FlipContext *flip = link->dst->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
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flip->vsub = desc->log2_chroma_h;
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return 0;
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}
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static AVFrame *get_video_buffer(AVFilterLink *link, int w, int h)
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{
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FlipContext *flip = link->dst->priv;
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AVFrame *frame;
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int i;
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frame = ff_get_video_buffer(link->dst->outputs[0], w, h);
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if (!frame)
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return NULL;
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for (i = 0; i < 4; i ++) {
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int vsub = i == 1 || i == 2 ? flip->vsub : 0;
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if (frame->data[i]) {
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frame->data[i] += ((h >> vsub) - 1) * frame->linesize[i];
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frame->linesize[i] = -frame->linesize[i];
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}
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}
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return frame;
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}
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static int filter_frame(AVFilterLink *link, AVFrame *frame)
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{
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FlipContext *flip = link->dst->priv;
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int i;
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for (i = 0; i < 4; i ++) {
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int vsub = i == 1 || i == 2 ? flip->vsub : 0;
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if (frame->data[i]) {
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frame->data[i] += ((link->h >> vsub)-1) * frame->linesize[i];
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frame->linesize[i] = -frame->linesize[i];
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}
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}
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return ff_filter_frame(link->dst->outputs[0], frame);
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}
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static const AVFilterPad avfilter_vf_vflip_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.get_video_buffer = get_video_buffer,
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.filter_frame = filter_frame,
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.config_props = config_input,
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},
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{ NULL }
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};
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static const AVFilterPad avfilter_vf_vflip_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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AVFilter ff_vf_vflip = {
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.name = "vflip",
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.description = NULL_IF_CONFIG_SMALL("Flip the input video vertically."),
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.priv_size = sizeof(FlipContext),
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.inputs = avfilter_vf_vflip_inputs,
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.outputs = avfilter_vf_vflip_outputs,
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};
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