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>
63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
/*
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* V210 decoder DSP init
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*
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* Copyright (C) 2009 Michael Niedermayer <michaelni@gmx.at>
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* Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot 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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#ifndef AVCODEC_V210DEC_INIT_H
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#define AVCODEC_V210DEC_INIT_H
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#include <stdint.h>
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#include "config.h"
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#include "libavutil/attributes.h"
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#include "libavutil/bswap.h"
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#include "v210dec.h"
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#define READ_PIXELS(a, b, c) \
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do { \
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val = av_le2ne32(*src++); \
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*a++ = val & 0x3FF; \
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*b++ = (val >> 10) & 0x3FF; \
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*c++ = (val >> 20) & 0x3FF; \
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} while (0)
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static void v210_planar_unpack_c(const uint32_t *src, uint16_t *y, uint16_t *u, uint16_t *v, int width)
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{
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uint32_t val;
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for (int i = 0; i < width - 5; i += 6) {
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READ_PIXELS(u, y, v);
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READ_PIXELS(y, u, y);
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READ_PIXELS(v, y, u);
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READ_PIXELS(y, v, y);
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}
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}
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static av_unused av_cold void ff_v210dec_init(V210DecContext *s)
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{
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s->unpack_frame = v210_planar_unpack_c;
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#if ARCH_X86
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ff_v210_x86_init(s);
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#endif
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}
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#endif /* AVCODEC_V210DEC_INIT_H */
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