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>
92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
/*
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* V210 encoder DSP init
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*
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* Copyright (C) 2009 Michael Niedermayer <michaelni@gmx.at>
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* Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
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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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#ifndef AVCODEC_V210ENC_INIT_H
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#define AVCODEC_V210ENC_INIT_H
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#include <stddef.h>
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#include <stdint.h>
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#include "config.h"
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#include "libavutil/attributes.h"
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#include "libavutil/common.h"
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#include "libavutil/intreadwrite.h"
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#include "v210enc.h"
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#define CLIP(v, depth) av_clip(v, 1<<(depth-8), ((1<<depth)-(1<<(depth-8))-1))
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#define WRITE_PIXELS(a, b, c, depth) \
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do { \
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val = CLIP(*a++, depth) << (10-depth); \
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val |= (CLIP(*b++, depth) << (20-depth)) | \
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(CLIP(*c++, depth) << (30-depth)); \
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AV_WL32(dst, val); \
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dst += 4; \
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} while (0)
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static void v210_planar_pack_8_c(const uint8_t *y, const uint8_t *u,
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const uint8_t *v, uint8_t *dst,
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ptrdiff_t width)
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{
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uint32_t val;
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/* unroll this to match the assembly */
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for (int i = 0; i < width - 11; i += 12) {
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WRITE_PIXELS(u, y, v, 8);
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WRITE_PIXELS(y, u, y, 8);
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WRITE_PIXELS(v, y, u, 8);
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WRITE_PIXELS(y, v, y, 8);
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WRITE_PIXELS(u, y, v, 8);
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WRITE_PIXELS(y, u, y, 8);
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WRITE_PIXELS(v, y, u, 8);
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WRITE_PIXELS(y, v, y, 8);
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}
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}
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static void v210_planar_pack_10_c(const uint16_t *y, const uint16_t *u,
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const uint16_t *v, uint8_t *dst,
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ptrdiff_t width)
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{
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uint32_t val;
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for (int i = 0; i < width - 5; i += 6) {
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WRITE_PIXELS(u, y, v, 10);
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WRITE_PIXELS(y, u, y, 10);
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WRITE_PIXELS(v, y, u, 10);
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WRITE_PIXELS(y, v, y, 10);
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}
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}
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static av_cold av_unused void ff_v210enc_init(V210EncContext *s)
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{
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s->pack_line_8 = v210_planar_pack_8_c;
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s->pack_line_10 = v210_planar_pack_10_c;
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s->sample_factor_8 = 2;
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s->sample_factor_10 = 1;
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#if ARCH_X86
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ff_v210enc_init_x86(s);
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#endif
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}
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#endif /* AVCODEC_V210ENC_INIT_H */
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