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https://github.com/FFmpeg/FFmpeg.git
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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>
79 lines
2.0 KiB
C
79 lines
2.0 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 <stdint.h>
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#include <string.h>
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#include "config.h"
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#include "libavutil/attributes.h"
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#include "avcodec.h"
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#include "blockdsp.h"
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static void clear_block_c(int16_t *block)
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{
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memset(block, 0, sizeof(int16_t) * 64);
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}
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static void clear_blocks_c(int16_t *blocks)
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{
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memset(blocks, 0, sizeof(int16_t) * 6 * 64);
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}
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static void fill_block16_c(uint8_t *block, uint8_t value, ptrdiff_t line_size,
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int h)
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{
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int i;
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for (i = 0; i < h; i++) {
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memset(block, value, 16);
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block += line_size;
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}
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}
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static void fill_block8_c(uint8_t *block, uint8_t value, ptrdiff_t line_size,
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int h)
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{
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int i;
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for (i = 0; i < h; i++) {
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memset(block, value, 8);
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block += line_size;
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}
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}
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av_cold void ff_blockdsp_init(BlockDSPContext *c, AVCodecContext *avctx)
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{
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c->clear_block = clear_block_c;
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c->clear_blocks = clear_blocks_c;
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c->fill_block_tab[0] = fill_block16_c;
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c->fill_block_tab[1] = fill_block8_c;
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#if ARCH_ALPHA
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ff_blockdsp_init_alpha(c);
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#elif ARCH_ARM
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ff_blockdsp_init_arm(c);
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#elif ARCH_PPC
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ff_blockdsp_init_ppc(c);
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#elif ARCH_X86
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ff_blockdsp_init_x86(c, avctx);
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#elif ARCH_MIPS
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ff_blockdsp_init_mips(c);
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#endif
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}
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