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/* |
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* Copyright (c) 2007 Bobby Bingham |
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*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/** |
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* @file |
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* video vertical flip filter
*/
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#include "libavutil/pixdesc.h" |
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#include "avfilter.h" |
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#include "video.h" |
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typedef struct {
int vsub; ///< vertical chroma subsampling
} FlipContext;
static int config_input(AVFilterLink *link)
{
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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static AVFilterBufferRef *get_video_buffer(AVFilterLink *link, int perms, |
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int w, int h)
{
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 ff_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 ++) {
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];
}
}
return picref;
}
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static void start_frame(AVFilterLink *link, AVFilterBufferRef *inpicref) |
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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 ++) {
int vsub = i == 1 || i == 2 ? flip->vsub : 0;
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if (outpicref->data[i]) {
outpicref->data[i] += ((link->h >> vsub)-1) * outpicref->linesize[i];
outpicref->linesize[i] = -outpicref->linesize[i]; |
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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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{
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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}
AVFilter avfilter_vf_vflip = {
.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 = (const AVFilterPad[]) {{ .name = "default", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.get_video_buffer = get_video_buffer,
.start_frame = start_frame,
.draw_slice = draw_slice,
.config_props = config_input, },
{ .name = NULL}}, |
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.outputs = (const AVFilterPad[]) {{ .name = "default", |
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.type = AVMEDIA_TYPE_VIDEO, }, |
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{ .name = NULL}},
}; |