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40e6575aa3
This is more spec-compliant because it does not rely on dead-code elimination by the compiler. Especially MSVC has problems with this, as can be seen in https://ffmpeg.org/pipermail/ffmpeg-devel/2022-May/296373.html or https://ffmpeg.org/pipermail/ffmpeg-devel/2022-May/297022.html This commit does not eliminate every instance where we rely on dead code elimination: It only tackles branching to the initialization of arch-specific dsp code, not e.g. all uses of CONFIG_ and HAVE_ checks. But maybe it is already enough to compile FFmpeg with MSVC with whole-programm-optimizations enabled (if one does not disable too many components). Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
119 lines
4.3 KiB
C
119 lines
4.3 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 "cfhddsp.h"
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static av_always_inline void filter(int16_t *output, ptrdiff_t out_stride,
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const int16_t *low, ptrdiff_t low_stride,
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const int16_t *high, ptrdiff_t high_stride,
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int len, int clip)
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{
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int16_t tmp;
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int i;
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tmp = (11*low[0*low_stride] - 4*low[1*low_stride] + low[2*low_stride] + 4) >> 3;
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output[(2*0+0)*out_stride] = (tmp + high[0*high_stride]) >> 1;
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if (clip)
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output[(2*0+0)*out_stride] = av_clip_uintp2_c(output[(2*0+0)*out_stride], clip);
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tmp = ( 5*low[0*low_stride] + 4*low[1*low_stride] - low[2*low_stride] + 4) >> 3;
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output[(2*0+1)*out_stride] = (tmp - high[0*high_stride]) >> 1;
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if (clip)
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output[(2*0+1)*out_stride] = av_clip_uintp2_c(output[(2*0+1)*out_stride], clip);
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for (i = 1; i < len - 1; i++) {
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tmp = (low[(i-1)*low_stride] - low[(i+1)*low_stride] + 4) >> 3;
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output[(2*i+0)*out_stride] = (tmp + low[i*low_stride] + high[i*high_stride]) >> 1;
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if (clip)
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output[(2*i+0)*out_stride] = av_clip_uintp2_c(output[(2*i+0)*out_stride], clip);
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tmp = (low[(i+1)*low_stride] - low[(i-1)*low_stride] + 4) >> 3;
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output[(2*i+1)*out_stride] = (tmp + low[i*low_stride] - high[i*high_stride]) >> 1;
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if (clip)
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output[(2*i+1)*out_stride] = av_clip_uintp2_c(output[(2*i+1)*out_stride], clip);
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}
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tmp = ( 5*low[i*low_stride] + 4*low[(i-1)*low_stride] - low[(i-2)*low_stride] + 4) >> 3;
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output[(2*i+0)*out_stride] = (tmp + high[i*high_stride]) >> 1;
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if (clip)
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output[(2*i+0)*out_stride] = av_clip_uintp2_c(output[(2*i+0)*out_stride], clip);
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tmp = (11*low[i*low_stride] - 4*low[(i-1)*low_stride] + low[(i-2)*low_stride] + 4) >> 3;
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output[(2*i+1)*out_stride] = (tmp - high[i*high_stride]) >> 1;
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if (clip)
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output[(2*i+1)*out_stride] = av_clip_uintp2_c(output[(2*i+1)*out_stride], clip);
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}
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static void vert_filter(int16_t *output, ptrdiff_t out_stride,
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const int16_t *low, ptrdiff_t low_stride,
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const int16_t *high, 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(output, out_stride, low, low_stride, high, high_stride, height, 0);
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low++;
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high++;
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output++;
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}
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}
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static void horiz_filter(int16_t *output, ptrdiff_t ostride,
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const int16_t *low, ptrdiff_t lstride,
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const int16_t *high, ptrdiff_t hstride,
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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(output, 1, low, 1, high, 1, width, 0);
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low += lstride;
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high += hstride;
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output += ostride * 2;
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}
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}
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static void horiz_filter_clip(int16_t *output, const int16_t *low, const int16_t *high,
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int width, int clip)
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{
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filter(output, 1, low, 1, high, 1, width, clip);
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}
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static void horiz_filter_clip_bayer(int16_t *output, const int16_t *low, const int16_t *high,
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int width, int clip)
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{
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filter(output, 2, low, 1, high, 1, width, clip);
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}
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av_cold void ff_cfhddsp_init(CFHDDSPContext *c, int depth, int bayer)
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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 (bayer)
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c->horiz_filter_clip = horiz_filter_clip_bayer;
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else
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c->horiz_filter_clip = horiz_filter_clip;
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#if ARCH_X86
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ff_cfhddsp_init_x86(c, depth, bayer);
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#endif
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}
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