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https://gitee.com/openharmony/third_party_ffmpeg
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675bb1f4f9
This version is able to output multiple coefficients at a time and is able to altogether remove actual golomb code parsing. Its also able to partially recover the last coefficient in case the packet is incomplete. Total decoder performance gain for 8bit 420 1080p lossless: 40%. Total decoder performance gain for 10bit 420 1080p lossless: 40%. clang was able to vectorize the loop much better than my handwritten assembly, but gcc was very naive and didn't. Lookup table is a rewritten version of vc2hqdecode.
30 lines
1.1 KiB
C
30 lines
1.1 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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#ifndef AVCODEC_DIRAC_VLC_H
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#define AVCODEC_DIRAC_VLC_H
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#include "libavutil/avutil.h"
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int ff_dirac_golomb_read_16bit(const uint8_t *buf, int bytes,
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uint8_t *_dst, int coeffs);
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int ff_dirac_golomb_read_32bit(const uint8_t *buf, int bytes,
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uint8_t *_dst, int coeffs);
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#endif /* AVCODEC_DIRAC_VLC_H */
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