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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>
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/*
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* Copyright (C) 2012 Ronald S. Bultje
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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 "libavutil/avassert.h"
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#include "libavutil/macros.h"
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#include "videodsp.h"
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#define BIT_DEPTH 8
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#include "videodsp_template.c"
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#undef BIT_DEPTH
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#define BIT_DEPTH 16
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#include "videodsp_template.c"
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#undef BIT_DEPTH
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static void just_return(uint8_t *buf, ptrdiff_t stride, int h)
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{
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}
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av_cold void ff_videodsp_init(VideoDSPContext *ctx, int bpc)
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{
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ctx->prefetch = just_return;
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if (bpc <= 8) {
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ctx->emulated_edge_mc = ff_emulated_edge_mc_8;
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} else {
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ctx->emulated_edge_mc = ff_emulated_edge_mc_16;
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}
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#if ARCH_AARCH64
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ff_videodsp_init_aarch64(ctx, bpc);
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#elif ARCH_ARM
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ff_videodsp_init_arm(ctx, bpc);
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#elif ARCH_PPC
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ff_videodsp_init_ppc(ctx, bpc);
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#elif ARCH_X86
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ff_videodsp_init_x86(ctx, bpc);
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#elif ARCH_MIPS
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ff_videodsp_init_mips(ctx, bpc);
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#elif ARCH_LOONGARCH64
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ff_videodsp_init_loongarch(ctx, bpc);
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#endif
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}
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