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 "ttadata.h"
22
23 const uint32_t ff_tta_shift_1[] = {
24 0x00000001, 0x00000002, 0x00000004, 0x00000008,
25 0x00000010, 0x00000020, 0x00000040, 0x00000080,
26 0x00000100, 0x00000200, 0x00000400, 0x00000800,
27 0x00001000, 0x00002000, 0x00004000, 0x00008000,
28 0x00010000, 0x00020000, 0x00040000, 0x00080000,
29 0x00100000, 0x00200000, 0x00400000, 0x00800000,
30 0x01000000, 0x02000000, 0x04000000, 0x08000000,
31 0x10000000, 0x20000000, 0x40000000, 0x80000000,
32 0x80000000, 0x80000000, 0x80000000, 0x80000000,
33 0x80000000, 0x80000000, 0x80000000, 0x80000000,
34 0xFFFFFFFF
35 };
36
37 const uint32_t * const ff_tta_shift_16 = ff_tta_shift_1 + 4;
38
39 const uint8_t ff_tta_filter_configs[] = { 10, 9, 10, 12 };
40
ff_tta_rice_init(TTARice * c,uint32_t k0,uint32_t k1)41 void ff_tta_rice_init(TTARice *c, uint32_t k0, uint32_t k1)
42 {
43 c->k0 = k0;
44 c->k1 = k1;
45 c->sum0 = ff_tta_shift_16[k0];
46 c->sum1 = ff_tta_shift_16[k1];
47 }
48
ff_tta_filter_init(TTAFilter * c,int32_t shift)49 void ff_tta_filter_init(TTAFilter *c, int32_t shift) {
50 memset(c, 0, sizeof(TTAFilter));
51 c->shift = shift;
52 c->round = ff_tta_shift_1[shift-1];
53 }
54