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/*
* Copyright (c) 2015-2016 Kieran Kunhya <kieran@kunhya.com>
*
* 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
*/
#include "libavutil/attributes.h"
#include "libavutil/common.h"
#include "cfhddsp.h"
static av_always_inline void filter(int16_t *output, ptrdiff_t out_stride,
const int16_t *low, ptrdiff_t low_stride,
const int16_t *high, ptrdiff_t high_stride,
int len, int clip)
{
int16_t tmp;
int i;
tmp = (11*low[0*low_stride] - 4*low[1*low_stride] + low[2*low_stride] + 4) >> 3;
output[(2*0+0)*out_stride] = (tmp + high[0*high_stride]) >> 1;
if (clip)
output[(2*0+0)*out_stride] = av_clip_uintp2_c(output[(2*0+0)*out_stride], clip);
tmp = ( 5*low[0*low_stride] + 4*low[1*low_stride] - low[2*low_stride] + 4) >> 3;
output[(2*0+1)*out_stride] = (tmp - high[0*high_stride]) >> 1;
if (clip)
output[(2*0+1)*out_stride] = av_clip_uintp2_c(output[(2*0+1)*out_stride], clip);
for (i = 1; i < len - 1; i++) {
tmp = (low[(i-1)*low_stride] - low[(i+1)*low_stride] + 4) >> 3;
output[(2*i+0)*out_stride] = (tmp + low[i*low_stride] + high[i*high_stride]) >> 1;
if (clip)
output[(2*i+0)*out_stride] = av_clip_uintp2_c(output[(2*i+0)*out_stride], clip);
tmp = (low[(i+1)*low_stride] - low[(i-1)*low_stride] + 4) >> 3;
output[(2*i+1)*out_stride] = (tmp + low[i*low_stride] - high[i*high_stride]) >> 1;
if (clip)
output[(2*i+1)*out_stride] = av_clip_uintp2_c(output[(2*i+1)*out_stride], clip);
}
tmp = ( 5*low[i*low_stride] + 4*low[(i-1)*low_stride] - low[(i-2)*low_stride] + 4) >> 3;
output[(2*i+0)*out_stride] = (tmp + high[i*high_stride]) >> 1;
if (clip)
output[(2*i+0)*out_stride] = av_clip_uintp2_c(output[(2*i+0)*out_stride], clip);
tmp = (11*low[i*low_stride] - 4*low[(i-1)*low_stride] + low[(i-2)*low_stride] + 4) >> 3;
output[(2*i+1)*out_stride] = (tmp - high[i*high_stride]) >> 1;
if (clip)
output[(2*i+1)*out_stride] = av_clip_uintp2_c(output[(2*i+1)*out_stride], clip);
}
static void vert_filter(int16_t *output, ptrdiff_t out_stride,
const int16_t *low, ptrdiff_t low_stride,
const int16_t *high, ptrdiff_t high_stride,
int width, int height)
{
for (int i = 0; i < width; i++) {
filter(output, out_stride, low, low_stride, high, high_stride, height, 0);
low++;
high++;
output++;
}
}
static void horiz_filter(int16_t *output, ptrdiff_t ostride,
const int16_t *low, ptrdiff_t lstride,
const int16_t *high, ptrdiff_t hstride,
int width, int height)
{
for (int i = 0; i < height; i++) {
filter(output, 1, low, 1, high, 1, width, 0);
low += lstride;
high += hstride;
output += ostride * 2;
}
}
static void horiz_filter_clip(int16_t *output, const int16_t *low, const int16_t *high,
int width, int clip)
{
filter(output, 1, low, 1, high, 1, width, clip);
}
static void horiz_filter_clip_bayer(int16_t *output, const int16_t *low, const int16_t *high,
int width, int clip)
{
filter(output, 2, low, 1, high, 1, width, clip);
}
av_cold void ff_cfhddsp_init(CFHDDSPContext *c, int depth, int bayer)
{
c->horiz_filter = horiz_filter;
c->vert_filter = vert_filter;
if (bayer)
c->horiz_filter_clip = horiz_filter_clip_bayer;
else
c->horiz_filter_clip = horiz_filter_clip;
#if ARCH_X86
ff_cfhddsp_init_x86(c, depth, bayer);
#endif
}
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