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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)
43 lines
1.5 KiB
C
43 lines
1.5 KiB
C
/*
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* Unpack bit-packed streams to formats supported by FFmpeg
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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_H
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#define AVCODEC_BITPACKED_DEC_H
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#include <stdint.h>
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#include "avcodec.h"
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struct BitpackedContext {
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int (*decode)(AVCodecContext *avctx, AVFrame *frame,
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const AVPacket *pkt);
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/* width must be a positive multiple of 8; src contains width * 5 / 2 bytes. */
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void (*unpack_yuv422p10)(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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void ff_bitpacked_init_aarch64(struct BitpackedContext *s);
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void ff_bitpacked_init_x86(struct BitpackedContext *s);
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#endif /* AVCODEC_BITPACKED_DEC_H */
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