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