mirror of
https://github.com/FFmpeg/FFmpeg.git
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107 lines
3.4 KiB
C
107 lines
3.4 KiB
C
/*
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* Copyright (c) 2007 Bobby Bingham
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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/pixdesc.h"
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#include "avfilter.h"
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typedef struct {
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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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flip->vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
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return 0;
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}
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static AVFilterBufferRef *get_video_buffer(AVFilterLink *link, int perms,
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int w, int h)
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{
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FlipContext *flip = link->dst->priv;
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AVFilterBufferRef *picref;
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int i;
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if (!(perms & AV_PERM_NEG_LINESIZES))
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return avfilter_default_get_video_buffer(link, perms, w, h);
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picref = avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
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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 (picref->data[i]) {
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picref->data[i] += ((h >> vsub)-1) * picref->linesize[i];
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picref->linesize[i] = -picref->linesize[i];
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}
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}
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return picref;
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}
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static void start_frame(AVFilterLink *link, AVFilterBufferRef *inpicref)
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{
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FlipContext *flip = link->dst->priv;
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AVFilterBufferRef *outpicref = avfilter_ref_buffer(inpicref, ~0);
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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 (outpicref->data[i]) {
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outpicref->data[i] += ((link->h >> vsub)-1) * outpicref->linesize[i];
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outpicref->linesize[i] = -outpicref->linesize[i];
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}
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}
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avfilter_start_frame(link->dst->outputs[0], outpicref);
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}
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static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
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{
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AVFilterContext *ctx = link->dst;
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avfilter_draw_slice(ctx->outputs[0], link->h - (y+h), h, -1 * slice_dir);
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}
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AVFilter avfilter_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 = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.get_video_buffer = get_video_buffer,
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.start_frame = start_frame,
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.draw_slice = draw_slice,
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.config_props = config_input, },
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{ .name = NULL}},
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.outputs = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO, },
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{ .name = NULL}},
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};
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