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https://github.com/FFmpeg/FFmpeg.git
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53 lines
1.8 KiB
C
53 lines
1.8 KiB
C
/*
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* TTA (The Lossless True Audio) data
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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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#include "ttadata.h"
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const uint32_t ff_tta_shift_1[] = {
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0x00000001, 0x00000002, 0x00000004, 0x00000008,
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0x00000010, 0x00000020, 0x00000040, 0x00000080,
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0x00000100, 0x00000200, 0x00000400, 0x00000800,
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0x00001000, 0x00002000, 0x00004000, 0x00008000,
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0x00010000, 0x00020000, 0x00040000, 0x00080000,
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0x00100000, 0x00200000, 0x00400000, 0x00800000,
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0x01000000, 0x02000000, 0x04000000, 0x08000000,
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0x10000000, 0x20000000, 0x40000000, 0x80000000,
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0x80000000, 0x80000000, 0x80000000, 0x80000000,
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0x80000000, 0x80000000, 0x80000000, 0x80000000
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};
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const uint32_t * const ff_tta_shift_16 = ff_tta_shift_1 + 4;
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const uint8_t ff_tta_filter_configs[] = { 10, 9, 10, 12 };
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void ff_tta_rice_init(TTARice *c, uint32_t k0, uint32_t k1)
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{
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c->k0 = k0;
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c->k1 = k1;
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c->sum0 = ff_tta_shift_16[k0];
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c->sum1 = ff_tta_shift_16[k1];
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}
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void ff_tta_filter_init(TTAFilter *c, int32_t shift) {
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memset(c, 0, sizeof(TTAFilter));
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c->shift = shift;
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c->round = ff_tta_shift_1[shift-1];
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}
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