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https://git.ffmpeg.org/ffmpeg.git
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508b82c605
Add runtime-dispatched SSSE3 and AVX2 implementations for packed
10-bit YUV 4:2:2. The SSSE3 loop follows the negative-width output-offset
pattern used by v210. The AVX2 loop processes 16 pixels at a time and has
an internal eight-pixel tail.
Both implementations use exact-width input loads and therefore do not
rely on padded input or legal overread. They passed 300 consecutive checkasm
seeds.
Benchmark command:
./tests/checkasm/checkasm --bench --test=bitpackeddec \
--duration=1000000 51000
Intel Xeon E-2356G, GCC 8.5, NASM 2.15.03:
bitpacked_unpack_yuv422p10_c: 13516.7
bitpacked_unpack_yuv422p10_ssse3: 3415.8 (3.96x)
bitpacked_unpack_yuv422p10_avx2: 2183.1 (6.19x)
57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
/*
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* Bitpacked decoder DSP init
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* Copyright (c) 2017 Savoir-faire Linux, Inc
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* Copyright (c) 2026 Devin Heitmueller <dheitmueller@ltnglobal.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_BITPACKED_DEC_INIT_H
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#define AVCODEC_BITPACKED_DEC_INIT_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 "bitpacked_dec.h"
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static void bitpacked_unpack_yuv422p10_c(const uint8_t *src,
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uint16_t *y, uint16_t *u, uint16_t *v,
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int width)
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{
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for (int i = 0; i < width; i += 2) {
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*u++ = (src[0] << 2) | (src[1] >> 6);
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*v++ = ((src[2] << 6) | (src[3] >> 2)) & 0x3ff;
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*y++ = ((src[1] << 4) | (src[2] >> 4)) & 0x3ff;
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*y++ = ((src[3] << 8) | src[4]) & 0x3ff;
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src += 5;
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}
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}
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av_unused static av_cold void ff_bitpackeddec_init(struct BitpackedContext *s)
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{
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s->unpack_yuv422p10 = bitpacked_unpack_yuv422p10_c;
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#if ARCH_AARCH64
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ff_bitpacked_init_aarch64(s);
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#elif ARCH_X86 && HAVE_X86ASM
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ff_bitpacked_init_x86(s);
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#endif
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}
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#endif /* AVCODEC_BITPACKED_DEC_INIT_H */
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