FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
ttadata.c
Go to the documentation of this file.
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 };
35 
36 const uint32_t * const ff_tta_shift_16 = ff_tta_shift_1 + 4;
37 
38 const uint8_t ff_tta_filter_configs[] = { 10, 9, 10, 12 };
39 
40 void ff_tta_rice_init(TTARice *c, uint32_t k0, uint32_t k1)
41 {
42  c->k0 = k0;
43  c->k1 = k1;
44  c->sum0 = ff_tta_shift_16[k0];
45  c->sum1 = ff_tta_shift_16[k1];
46 }
47 
49  memset(c, 0, sizeof(TTAFilter));
50  c->shift = shift;
51  c->round = ff_tta_shift_1[shift-1];
52 }