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https://git.ffmpeg.org/ffmpeg.git
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80 lines
3.4 KiB
C
80 lines
3.4 KiB
C
/*
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* Copyright (c) 2015-2016 Kieran Kunhya <kieran@kunhya.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/attributes.h"
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#include "libavutil/common.h"
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#include "cfhdencdsp.h"
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static av_always_inline void filter(const int16_t *input, ptrdiff_t in_stride,
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int16_t *low, ptrdiff_t low_stride,
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int16_t *high, ptrdiff_t high_stride,
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int len)
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{
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low[(0>>1) * low_stride] = av_clip_int16(input[0*in_stride] + input[1*in_stride]);
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high[(0>>1) * high_stride] = av_clip_int16((5 * input[0*in_stride] - 11 * input[1*in_stride] +
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4 * input[2*in_stride] + 4 * input[3*in_stride] -
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1 * input[4*in_stride] - 1 * input[5*in_stride] + 4) >> 3);
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for (int i = 2; i < len - 2; i += 2) {
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low[(i>>1) * low_stride] = av_clip_int16(input[i*in_stride] + input[(i+1)*in_stride]);
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high[(i>>1) * high_stride] = av_clip_int16(((-input[(i-2)*in_stride] - input[(i-1)*in_stride] +
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input[(i+2)*in_stride] + input[(i+3)*in_stride] + 4) >> 3) +
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input[(i+0)*in_stride] - input[(i+1)*in_stride]);
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}
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low[((len-2)>>1) * low_stride] = av_clip_int16(input[((len-2)+0)*in_stride] + input[((len-2)+1)*in_stride]);
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high[((len-2)>>1) * high_stride] = av_clip_int16((11* input[((len-2)+0)*in_stride] - 5 * input[((len-2)+1)*in_stride] -
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4 * input[((len-2)-1)*in_stride] - 4 * input[((len-2)-2)*in_stride] +
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1 * input[((len-2)-3)*in_stride] + 1 * input[((len-2)-4)*in_stride] + 4) >> 3);
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}
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static void horiz_filter(const int16_t *input, int16_t *low, int16_t *high,
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ptrdiff_t in_stride, ptrdiff_t low_stride,
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ptrdiff_t high_stride,
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int width, int height)
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{
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for (int i = 0; i < height; i++) {
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filter(input, 1, low, 1, high, 1, width);
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input += in_stride;
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low += low_stride;
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high += high_stride;
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}
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}
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static void vert_filter(const int16_t *input, int16_t *low, int16_t *high,
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ptrdiff_t in_stride, ptrdiff_t low_stride,
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ptrdiff_t high_stride,
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int width, int height)
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{
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for (int i = 0; i < width; i++)
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filter(&input[i], in_stride, &low[i], low_stride, &high[i], high_stride, height);
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}
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av_cold void ff_cfhdencdsp_init(CFHDEncDSPContext *c)
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{
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c->horiz_filter = horiz_filter;
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c->vert_filter = vert_filter;
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#if ARCH_X86
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ff_cfhdencdsp_init_x86(c);
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#endif
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}
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