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/*
* Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
*
* 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
* swap UV filter
*/
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
typedef struct SwapUVContext {
const AVClass *class;
} SwapUVContext;
static const AVOption swapuv_options[] = {
{ NULL }
};
AVFILTER_DEFINE_CLASS(swapuv);
static void do_swap(AVFrame *frame)
{
FFSWAP(uint8_t*, frame->data[1], frame->data[2]);
FFSWAP(int, frame->linesize[1], frame->linesize[2]);
FFSWAP(AVBufferRef*, frame->buf[1], frame->buf[2]);
}
static AVFrame *get_video_buffer(AVFilterLink *link, int w, int h)
{
AVFrame *picref = ff_default_get_video_buffer(link, w, h);
do_swap(picref);
return picref;
}
static int filter_frame(AVFilterLink *link, AVFrame *inpicref)
{
do_swap(inpicref);
return ff_filter_frame(link->dst->outputs[0], inpicref);
}
static int is_planar_yuv(const AVPixFmtDescriptor *desc)
{
int i;
if (desc->flags & ~(AV_PIX_FMT_FLAG_BE | AV_PIX_FMT_FLAG_PLANAR | AV_PIX_FMT_FLAG_ALPHA) ||
desc->nb_components < 3 ||
(desc->comp[1].depth != desc->comp[2].depth))
return 0;
for (i = 0; i < desc->nb_components; i++) {
if (desc->comp[i].offset != 0 ||
desc->comp[i].shift != 0 ||
desc->comp[i].plane != i)
return 0;
}
return 1;
}
static int query_formats(AVFilterContext *ctx)
{
AVFilterFormats *formats = NULL;
int fmt, ret;
for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
if (is_planar_yuv(desc) && (ret = ff_add_format(&formats, fmt)) < 0)
return ret;
}
return ff_set_common_formats(ctx, formats);
}
static const AVFilterPad swapuv_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.get_buffer.video = get_video_buffer,
.filter_frame = filter_frame,
},
};
const AVFilter ff_vf_swapuv = {
.name = "swapuv",
.description = NULL_IF_CONFIG_SMALL("Swap U and V components."),
.priv_size = sizeof(SwapUVContext),
.priv_class = &swapuv_class,
FILTER_INPUTS(swapuv_inputs),
FILTER_OUTPUTS(ff_video_default_filterpad),
FILTER_QUERY_FUNC(query_formats),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};
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