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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 "cfhdencdsp.h"
static av_always_inline void filter(const int16_t *input, ptrdiff_t in_stride,
int16_t *low, ptrdiff_t low_stride,
int16_t *high, ptrdiff_t high_stride,
int len)
{
low[(0>>1) * low_stride] = av_clip_int16(input[0*in_stride] + input[1*in_stride]);
high[(0>>1) * high_stride] = av_clip_int16((5 * input[0*in_stride] - 11 * input[1*in_stride] +
4 * input[2*in_stride] + 4 * input[3*in_stride] -
1 * input[4*in_stride] - 1 * input[5*in_stride] + 4) >> 3);
for (int i = 2; i < len - 2; i += 2) {
low[(i>>1) * low_stride] = av_clip_int16(input[i*in_stride] + input[(i+1)*in_stride]);
high[(i>>1) * high_stride] = av_clip_int16(((-input[(i-2)*in_stride] - input[(i-1)*in_stride] +
input[(i+2)*in_stride] + input[(i+3)*in_stride] + 4) >> 3) +
input[(i+0)*in_stride] - input[(i+1)*in_stride]);
}
low[((len-2)>>1) * low_stride] = av_clip_int16(input[((len-2)+0)*in_stride] + input[((len-2)+1)*in_stride]);
high[((len-2)>>1) * high_stride] = av_clip_int16((11* input[((len-2)+0)*in_stride] - 5 * input[((len-2)+1)*in_stride] -
4 * input[((len-2)-1)*in_stride] - 4 * input[((len-2)-2)*in_stride] +
1 * input[((len-2)-3)*in_stride] + 1 * input[((len-2)-4)*in_stride] + 4) >> 3);
}
static void horiz_filter(const int16_t *input, int16_t *low, int16_t *high,
ptrdiff_t in_stride, ptrdiff_t low_stride,
ptrdiff_t high_stride,
int width, int height)
{
for (int i = 0; i < height; i++) {
filter(input, 1, low, 1, high, 1, width);
input += in_stride;
low += low_stride;
high += high_stride;
}
}
static void vert_filter(const int16_t *input, int16_t *low, int16_t *high,
ptrdiff_t in_stride, ptrdiff_t low_stride,
ptrdiff_t high_stride,
int width, int height)
{
for (int i = 0; i < width; i++)
filter(&input[i], in_stride, &low[i], low_stride, &high[i], high_stride, height);
}
av_cold void ff_cfhdencdsp_init(CFHDEncDSPContext *c)
{
c->horiz_filter = horiz_filter;
c->vert_filter = vert_filter;
#if ARCH_X86
ff_cfhdencdsp_init_x86(c);
#endif
}
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