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https://github.com/FFmpeg/FFmpeg.git
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64ab577954
To avoid data dependencies, this does the following unroll, which
requires one extra but probably free addition:
coeff = (b * left_weight) >> decorr_shift;
b += a;
a -= coeff;
b -= coeff;
swap(a, b);
36 lines
1.3 KiB
C
36 lines
1.3 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_ALACDSP_H
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#define AVCODEC_ALACDSP_H
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#include <stdint.h>
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typedef struct ALACDSPContext {
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void (*decorrelate_stereo)(int32_t *buffer[2], int nb_samples,
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int decorr_shift, int decorr_left_weight);
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void (*append_extra_bits[2])(int32_t *buffer[2], int32_t *extra_bits_buffer[2],
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int extra_bits, int channels, int nb_samples);
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} ALACDSPContext;
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void ff_alacdsp_init(ALACDSPContext *c);
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void ff_alacdsp_init_riscv(ALACDSPContext *c);
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void ff_alacdsp_init_x86(ALACDSPContext *c);
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#endif /* AVCODEC_ALACDSP_H */
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