ecc8dada37
The struct is going to be used for storing audio buffer references as well, and the new name is more generic. Patch by S.N. Hemanth Meenakshisundaram @smeenaks@ucsd@edu@. Originally committed as revision 24730 to svn://svn.ffmpeg.org/ffmpeg/trunk
105 lines
3.3 KiB
C
105 lines
3.3 KiB
C
/*
|
|
* copyright (c) 2007 Bobby Bingham
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* video vertical flip filter
|
|
*/
|
|
|
|
#include "libavutil/pixdesc.h"
|
|
#include "avfilter.h"
|
|
|
|
typedef struct {
|
|
int vsub; ///< vertical chroma subsampling
|
|
} FlipContext;
|
|
|
|
static int config_input(AVFilterLink *link)
|
|
{
|
|
FlipContext *flip = link->dst->priv;
|
|
|
|
flip->vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static AVFilterBufferRef *get_video_buffer(AVFilterLink *link, int perms,
|
|
int w, int h)
|
|
{
|
|
FlipContext *flip = link->dst->priv;
|
|
int i;
|
|
|
|
AVFilterBufferRef *picref = avfilter_get_video_buffer(link->dst->outputs[0],
|
|
perms, w, h);
|
|
|
|
for (i = 0; i < 4; i ++) {
|
|
int vsub = i == 1 || i == 2 ? flip->vsub : 0;
|
|
|
|
if (picref->data[i]) {
|
|
picref->data[i] += ((h >> vsub)-1) * picref->linesize[i];
|
|
picref->linesize[i] = -picref->linesize[i];
|
|
}
|
|
}
|
|
|
|
return picref;
|
|
}
|
|
|
|
static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
|
|
{
|
|
FlipContext *flip = link->dst->priv;
|
|
int i;
|
|
|
|
for (i = 0; i < 4; i ++) {
|
|
int vsub = i == 1 || i == 2 ? flip->vsub : 0;
|
|
|
|
if (picref->data[i]) {
|
|
picref->data[i] += ((link->h >> vsub)-1) * picref->linesize[i];
|
|
picref->linesize[i] = -picref->linesize[i];
|
|
}
|
|
}
|
|
|
|
avfilter_start_frame(link->dst->outputs[0], picref);
|
|
}
|
|
|
|
static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
|
|
{
|
|
AVFilterContext *ctx = link->dst;
|
|
|
|
avfilter_draw_slice(ctx->outputs[0], link->h - (y+h), h, -1 * slice_dir);
|
|
}
|
|
|
|
AVFilter avfilter_vf_vflip = {
|
|
.name = "vflip",
|
|
.description = NULL_IF_CONFIG_SMALL("Flip the input video vertically."),
|
|
|
|
.priv_size = sizeof(FlipContext),
|
|
|
|
.inputs = (AVFilterPad[]) {{ .name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.get_video_buffer = get_video_buffer,
|
|
.start_frame = start_frame,
|
|
.draw_slice = draw_slice,
|
|
.end_frame = avfilter_null_end_frame,
|
|
.config_props = config_input, },
|
|
{ .name = NULL}},
|
|
.outputs = (AVFilterPad[]) {{ .name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO, },
|
|
{ .name = NULL}},
|
|
};
|