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FFmpeg/libavcodec/fmtconvert.c
Andreas Rheinhardt 40e6575aa3 all: Replace if (ARCH_FOO) checks by #if ARCH_FOO
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>
2022-06-15 04:56:37 +02:00

72 lines
2.2 KiB
C

/*
* Format Conversion Utils
* Copyright (c) 2000, 2001 Fabrice Bellard
* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "libavutil/attributes.h"
#include "avcodec.h"
#include "fmtconvert.h"
static void int32_to_float_fmul_scalar_c(float *dst, const int32_t *src,
float mul, int len)
{
int i;
for(i=0; i<len; i++)
dst[i] = src[i] * mul;
}
static void int32_to_float_c(float *dst, const int32_t *src, intptr_t len)
{
int i;
for (i = 0; i < len; i++)
dst[i] = (float)src[i];
}
static void int32_to_float_fmul_array8_c(FmtConvertContext *c, float *dst,
const int32_t *src, const float *mul,
int len)
{
int i;
for (i = 0; i < len; i += 8)
c->int32_to_float_fmul_scalar(&dst[i], &src[i], *mul++, 8);
}
av_cold void ff_fmt_convert_init(FmtConvertContext *c, AVCodecContext *avctx)
{
c->int32_to_float = int32_to_float_c;
c->int32_to_float_fmul_scalar = int32_to_float_fmul_scalar_c;
c->int32_to_float_fmul_array8 = int32_to_float_fmul_array8_c;
#if ARCH_AARCH64
ff_fmt_convert_init_aarch64(c, avctx);
#elif ARCH_ARM
ff_fmt_convert_init_arm(c, avctx);
#elif ARCH_PPC
ff_fmt_convert_init_ppc(c, avctx);
#elif ARCH_X86
ff_fmt_convert_init_x86(c, avctx);
#endif
#if HAVE_MIPSFPU
ff_fmt_convert_init_mips(c);
#endif
}