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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>
87 lines
2.8 KiB
C
87 lines
2.8 KiB
C
/*
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* Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
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* Copyright (c) 2010 Mans Rullgard <mans@mansr.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 <stdint.h>
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#include "config.h"
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#include "config_components.h"
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#include "libavutil/attributes.h"
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#include "vp56dsp.h"
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#include "libavutil/common.h"
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#define VP56_EDGE_FILTER(pfx, suf, pix_inc, line_inc) \
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static void pfx ## _edge_filter_ ## suf(uint8_t *yuv, ptrdiff_t stride, \
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int t) \
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{ \
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int pix2_inc = 2 * pix_inc; \
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int i, v; \
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\
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for (i=0; i<12; i++) { \
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v = (yuv[-pix2_inc] + 3*(yuv[0]-yuv[-pix_inc]) - yuv[pix_inc] + 4)>>3;\
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v = pfx##_adjust(v, t); \
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yuv[-pix_inc] = av_clip_uint8(yuv[-pix_inc] + v); \
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yuv[0] = av_clip_uint8(yuv[0] - v); \
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yuv += line_inc; \
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} \
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}
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#if CONFIG_VP5_DECODER
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/* Gives very similar result than the vp6 version except in a few cases */
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static int vp5_adjust(int v, int t)
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{
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int s2, s1 = v >> 31;
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v ^= s1;
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v -= s1;
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v *= v < 2*t;
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v -= t;
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s2 = v >> 31;
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v ^= s2;
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v -= s2;
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v = t - v;
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v += s1;
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v ^= s1;
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return v;
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}
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VP56_EDGE_FILTER(vp5, hor, 1, stride)
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VP56_EDGE_FILTER(vp5, ver, stride, 1)
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av_cold void ff_vp5dsp_init(VP56DSPContext *s)
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{
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s->edge_filter_hor = vp5_edge_filter_hor;
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s->edge_filter_ver = vp5_edge_filter_ver;
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}
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#endif /* CONFIG_VP5_DECODER */
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#if CONFIG_VP6_DECODER
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av_cold void ff_vp6dsp_init(VP56DSPContext *s)
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{
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s->vp6_filter_diag4 = ff_vp6_filter_diag4_c;
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#if ARCH_ARM
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ff_vp6dsp_init_arm(s);
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#elif ARCH_X86
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ff_vp6dsp_init_x86(s);
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#endif
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}
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#endif /* CONFIG_VP6_DECODER */
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