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51 lines
1.8 KiB
C
51 lines
1.8 KiB
C
/*
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* Copyright (C) 2016 Open Broadcast Systems Ltd.
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* Author 2016 Rostislav Pehlivanov <rpehlivanov@obe.tv>
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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_DIRAC_VLC_H
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#define AVCODEC_DIRAC_VLC_H
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#include "libavutil/avutil.h"
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/* Can be 32 bits wide for some performance gain on some machines, but it will
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* incorrectly decode very long coefficients (usually only 1 or 2 per frame) */
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typedef uint64_t residual;
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#define LUT_BITS 8
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/* Exactly 64 bytes */
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typedef struct DiracGolombLUT {
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residual preamble, leftover;
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int32_t ready[LUT_BITS];
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int32_t preamble_bits, leftover_bits, ready_num;
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int8_t need_s, sign;
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} DiracGolombLUT;
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av_cold int ff_dirac_golomb_reader_init(DiracGolombLUT **lut_ctx);
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int ff_dirac_golomb_read_32bit(DiracGolombLUT *lut_ctx, const uint8_t *buf,
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int bytes, uint8_t *dst, int coeffs);
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int ff_dirac_golomb_read_16bit(DiracGolombLUT *lut_ctx, const uint8_t *buf,
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int bytes, uint8_t *_dst, int coeffs);
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av_cold void ff_dirac_golomb_reader_end(DiracGolombLUT **lut_ctx);
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#endif /* AVCODEC_DIRAC_VLC_H */
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