mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
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>
58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
/*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* Copyright (c) 2006 Industrial Light & Magic, a division of Lucas Digital Ltd. LLC
|
|
*
|
|
* 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 <stdint.h>
|
|
|
|
#include "libavutil/attributes.h"
|
|
#include "exrdsp.h"
|
|
#include "config.h"
|
|
|
|
static void reorder_pixels_scalar(uint8_t *dst, const uint8_t *src, ptrdiff_t size)
|
|
{
|
|
const uint8_t *t1 = src;
|
|
int half_size = size / 2;
|
|
const uint8_t *t2 = src + half_size;
|
|
uint8_t *s = dst;
|
|
int i;
|
|
|
|
for (i = 0; i < half_size; i++) {
|
|
*(s++) = *(t1++);
|
|
*(s++) = *(t2++);
|
|
}
|
|
}
|
|
|
|
static void predictor_scalar(uint8_t *src, ptrdiff_t size)
|
|
{
|
|
ptrdiff_t i;
|
|
|
|
for (i = 1; i < size; i++)
|
|
src[i] += src[i-1] - 128;
|
|
}
|
|
|
|
av_cold void ff_exrdsp_init(ExrDSPContext *c)
|
|
{
|
|
c->reorder_pixels = reorder_pixels_scalar;
|
|
c->predictor = predictor_scalar;
|
|
|
|
#if ARCH_X86
|
|
ff_exrdsp_init_x86(c);
|
|
#endif
|
|
}
|