mirror of https://git.videolan.org/git/ffmpeg.git
127 lines
4.9 KiB
C
127 lines
4.9 KiB
C
/*
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* Copyright (c) 2022 Thilo Borgmann <thilo.borgmann _at_ mail.de>
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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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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*/
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#include "libavutil/avassert.h"
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#include "avfilter.h"
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#include "internal.h"
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#include "video.h"
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#undef pixel
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#if DEPTH == 8
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#define pixel uint8_t
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#else
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#define pixel uint16_t
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#endif
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#undef fn
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#undef fn2
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#undef fn3
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#define fn3(a,b) ff_##a##_##b
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#define fn2(a,b) fn3(a,b)
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#define fn(a) fn2(a, DEPTH)
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void fn(sobel)(int w, int h,
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uint16_t *dst, int dst_linesize,
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int8_t *dir, int dir_linesize,
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const uint8_t *src, int src_linesize, int src_stride)
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{
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pixel *srcp = (pixel *)src;
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src_stride /= sizeof(pixel);
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src_linesize /= sizeof(pixel);
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dst_linesize /= sizeof(pixel);
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for (int j = 1; j < h - 1; j++) {
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dst += dst_linesize;
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dir += dir_linesize;
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srcp += src_linesize;
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for (int i = 1; i < w - 1; i++) {
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const int gx =
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-1*srcp[-src_linesize + (i-1)*src_stride] + 1*srcp[-src_linesize + (i+1)*src_stride]
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-2*srcp[ (i-1)*src_stride] + 2*srcp[ (i+1)*src_stride]
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-1*srcp[ src_linesize + (i-1)*src_stride] + 1*srcp[ src_linesize + (i+1)*src_stride];
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const int gy =
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-1*srcp[-src_linesize + (i-1)*src_stride] + 1*srcp[ src_linesize + (i-1)*src_stride]
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-2*srcp[-src_linesize + (i )*src_stride] + 2*srcp[ src_linesize + (i )*src_stride]
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-1*srcp[-src_linesize + (i+1)*src_stride] + 1*srcp[ src_linesize + (i+1)*src_stride];
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dst[i] = FFABS(gx) + FFABS(gy);
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dir[i] = get_rounded_direction(gx, gy);
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}
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}
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}
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void fn(gaussian_blur)(int w, int h,
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uint8_t *dst, int dst_linesize,
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const uint8_t *src, int src_linesize, int src_stride)
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{
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int j;
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pixel *srcp = (pixel *)src;
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pixel *dstp = (pixel *)dst;
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src_stride /= sizeof(pixel);
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src_linesize /= sizeof(pixel);
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dst_linesize /= sizeof(pixel);
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for (j = 0; j < FFMIN(h, 2); j++) {
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memcpy(dstp, srcp, w*sizeof(pixel));
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dstp += dst_linesize;
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srcp += src_linesize;
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}
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for (; j < h - 2; j++) {
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int i;
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for (i = 0; i < FFMIN(w, 2); i++)
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dstp[i] = srcp[i*src_stride];
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for (; i < w - 2; i++) {
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/* Gaussian mask of size 5x5 with sigma = 1.4 */
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dstp[i] = ((srcp[-2*src_linesize + (i-2)*src_stride] + srcp[2*src_linesize + (i-2)*src_stride]) * 2
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+ (srcp[-2*src_linesize + (i-1)*src_stride] + srcp[2*src_linesize + (i-1)*src_stride]) * 4
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+ (srcp[-2*src_linesize + (i )*src_stride] + srcp[2*src_linesize + (i )*src_stride]) * 5
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+ (srcp[-2*src_linesize + (i+1)*src_stride] + srcp[2*src_linesize + (i+1)*src_stride]) * 4
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+ (srcp[-2*src_linesize + (i+2)*src_stride] + srcp[2*src_linesize + (i+2)*src_stride]) * 2
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+ (srcp[ -src_linesize + (i-2)*src_stride] + srcp[ src_linesize + (i-2)*src_stride]) * 4
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+ (srcp[ -src_linesize + (i-1)*src_stride] + srcp[ src_linesize + (i-1)*src_stride]) * 9
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+ (srcp[ -src_linesize + (i )*src_stride] + srcp[ src_linesize + (i )*src_stride]) * 12
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+ (srcp[ -src_linesize + (i+1)*src_stride] + srcp[ src_linesize + (i+1)*src_stride]) * 9
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+ (srcp[ -src_linesize + (i+2)*src_stride] + srcp[ src_linesize + (i+2)*src_stride]) * 4
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+ srcp[(i-2)*src_stride] * 5
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+ srcp[(i-1)*src_stride] * 12
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+ srcp[(i )*src_stride] * 15
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+ srcp[(i+1)*src_stride] * 12
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+ srcp[(i+2)*src_stride] * 5) / 159;
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}
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for (; i < w; i++)
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dstp[i] = srcp[i*src_stride];
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dstp += dst_linesize;
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srcp += src_linesize;
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}
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for (; j < h; j++) {
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memcpy(dstp, srcp, w*sizeof(pixel));
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dstp += dst_linesize;
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srcp += src_linesize;
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}
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}
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