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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>
72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
/*
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* Format Conversion Utils
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* Copyright (c) 2000, 2001 Fabrice Bellard
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* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
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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 "config.h"
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#include "libavutil/attributes.h"
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#include "avcodec.h"
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#include "fmtconvert.h"
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static void int32_to_float_fmul_scalar_c(float *dst, const int32_t *src,
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float mul, int len)
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{
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int i;
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for(i=0; i<len; i++)
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dst[i] = src[i] * mul;
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}
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static void int32_to_float_c(float *dst, const int32_t *src, intptr_t len)
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{
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int i;
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for (i = 0; i < len; i++)
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dst[i] = (float)src[i];
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}
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static void int32_to_float_fmul_array8_c(FmtConvertContext *c, float *dst,
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const int32_t *src, const float *mul,
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int len)
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{
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int i;
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for (i = 0; i < len; i += 8)
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c->int32_to_float_fmul_scalar(&dst[i], &src[i], *mul++, 8);
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}
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av_cold void ff_fmt_convert_init(FmtConvertContext *c, AVCodecContext *avctx)
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{
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c->int32_to_float = int32_to_float_c;
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c->int32_to_float_fmul_scalar = int32_to_float_fmul_scalar_c;
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c->int32_to_float_fmul_array8 = int32_to_float_fmul_array8_c;
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#if ARCH_AARCH64
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ff_fmt_convert_init_aarch64(c, avctx);
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#elif ARCH_ARM
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ff_fmt_convert_init_arm(c, avctx);
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#elif ARCH_PPC
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ff_fmt_convert_init_ppc(c, avctx);
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#elif ARCH_X86
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ff_fmt_convert_init_x86(c, avctx);
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#endif
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#if HAVE_MIPSFPU
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ff_fmt_convert_init_mips(c);
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#endif
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}
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