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FFmpeg/libavcodec/fdctdsp.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

52 lines
1.7 KiB
C

/*
* 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 "libavutil/attributes.h"
#include "avcodec.h"
#include "dct.h"
#include "faandct.h"
#include "fdctdsp.h"
#include "config.h"
av_cold void ff_fdctdsp_init(FDCTDSPContext *c, AVCodecContext *avctx)
{
av_unused const unsigned high_bit_depth = avctx->bits_per_raw_sample > 8;
if (avctx->bits_per_raw_sample == 10 || avctx->bits_per_raw_sample == 9) {
c->fdct = ff_jpeg_fdct_islow_10;
c->fdct248 = ff_fdct248_islow_10;
} else if (avctx->dct_algo == FF_DCT_FASTINT) {
c->fdct = ff_fdct_ifast;
c->fdct248 = ff_fdct_ifast248;
#if CONFIG_FAANDCT
} else if (avctx->dct_algo == FF_DCT_FAAN) {
c->fdct = ff_faandct;
c->fdct248 = ff_faandct248;
#endif /* CONFIG_FAANDCT */
} else {
c->fdct = ff_jpeg_fdct_islow_8; // slow/accurate/default
c->fdct248 = ff_fdct248_islow_8;
}
#if ARCH_PPC
ff_fdctdsp_init_ppc(c, avctx, high_bit_depth);
#elif ARCH_X86
ff_fdctdsp_init_x86(c, avctx, high_bit_depth);
#endif
}