FFmpeg
ttadata.c
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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 }
static int shift(int a, int b)
Definition: sonic.c:82
void ff_tta_rice_init(TTARice *c, uint32_t k0, uint32_t k1)
Definition: ttadata.c:40
int32_t round
Definition: ttadata.h:28
uint8_t
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
int32_t shift
Definition: ttadata.h:28
uint32_t sum1
Definition: ttadata.h:35
const uint32_t ff_tta_shift_1[]
Definition: ttadata.c:23
const uint32_t *const ff_tta_shift_16
Definition: ttadata.c:36
int32_t
uint32_t k1
Definition: ttadata.h:35
const uint8_t ff_tta_filter_configs[]
Definition: ttadata.c:38
uint32_t k0
Definition: ttadata.h:35
void ff_tta_filter_init(TTAFilter *c, int32_t shift)
Definition: ttadata.c:48
uint32_t sum0
Definition: ttadata.h:35