1/* 2 * TTA (The Lossless True Audio) data 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21#include <string.h> 22#include "ttadata.h" 23 24const uint32_t ff_tta_shift_1[] = { 25 0x00000001, 0x00000002, 0x00000004, 0x00000008, 26 0x00000010, 0x00000020, 0x00000040, 0x00000080, 27 0x00000100, 0x00000200, 0x00000400, 0x00000800, 28 0x00001000, 0x00002000, 0x00004000, 0x00008000, 29 0x00010000, 0x00020000, 0x00040000, 0x00080000, 30 0x00100000, 0x00200000, 0x00400000, 0x00800000, 31 0x01000000, 0x02000000, 0x04000000, 0x08000000, 32 0x10000000, 0x20000000, 0x40000000, 0x80000000, 33 0x80000000, 0x80000000, 0x80000000, 0x80000000, 34 0x80000000, 0x80000000, 0x80000000, 0x80000000, 35 0xFFFFFFFF 36}; 37 38const uint32_t * const ff_tta_shift_16 = ff_tta_shift_1 + 4; 39 40const uint8_t ff_tta_filter_configs[] = { 10, 9, 10, 12 }; 41 42void ff_tta_rice_init(TTARice *c, uint32_t k0, uint32_t k1) 43{ 44 c->k0 = k0; 45 c->k1 = k1; 46 c->sum0 = ff_tta_shift_16[k0]; 47 c->sum1 = ff_tta_shift_16[k1]; 48} 49 50void ff_tta_filter_init(TTAFilter *c, int32_t shift) { 51 memset(c, 0, sizeof(TTAFilter)); 52 c->shift = shift; 53 c->round = ff_tta_shift_1[shift-1]; 54} 55