Statistics
| Branch: | Revision:

ffmpeg / libavcodec / atrac1data.h @ 2912e87a

History | View | Annotate | Download (2.59 KB)

1
/*
2
 * Atrac 1 compatible decoder data
3
 * Copyright (c) 2009 Maxim Poliakovski
4
 * Copyright (c) 2009 Benjamin Larsson
5
 *
6
 * This file is part of Libav.
7
 *
8
 * Libav is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2.1 of the License, or (at your option) any later version.
12
 *
13
 * Libav is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * Lesser General Public License for more details.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
19
 * License along with Libav; if not, write to the Free Software
20
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22

    
23
/**
24
 * @file
25
 * Atrac 1 compatible decoder data
26
 */
27

    
28
#ifndef AVCODEC_ATRAC1DATA_H
29
#define AVCODEC_ATRAC1DATA_H
30

    
31
#include <stdint.h>
32

    
33
static const uint8_t bfu_amount_tab1[8] = {20,  28,  32,  36, 40, 44, 48, 52};
34
static const uint8_t bfu_amount_tab2[4] = { 0, 112, 176, 208};
35
static const uint8_t bfu_amount_tab3[8] = { 0,  24,  36,  48, 72, 108, 132, 156};
36

    
37
/** number of BFUs in each QMF band */
38
static const uint8_t bfu_bands_t[4]  = {0, 20, 36, 52};
39

    
40
/** number of spectral lines in each BFU
41
 *  block floating unit = group of spectral frequencies having the
42
 *  same quantization parameters like word length and scale factor
43
 */
44
static const uint8_t specs_per_bfu[52] = {
45
     8,  8,  8,  8,  4,  4,  4,  4,  8,  8,  8,  8,  6,  6,  6,  6, 6, 6, 6, 6, // low band
46
     6,  6,  6,  6,  7,  7,  7,  7,  9,  9,  9,  9, 10, 10, 10, 10,             // midle band
47
    12, 12, 12, 12, 12, 12, 12, 12, 20, 20, 20, 20, 20, 20, 20, 20              // high band
48
};
49

    
50
/** start position of each BFU in the MDCT spectrum for the long mode */
51
static const uint16_t bfu_start_long[52] = {
52
      0,   8,  16,  24,  32,  36,  40,  44,  48,  56,  64,  72,  80,  86,  92,  98, 104, 110, 116, 122,
53
    128, 134, 140, 146, 152, 159, 166, 173, 180, 189, 198, 207, 216, 226, 236, 246,
54
    256, 268, 280, 292, 304, 316, 328, 340, 352, 372, 392, 412, 432, 452, 472, 492,
55
};
56

    
57
/** start position of each BFU in the MDCT spectrum for the short mode */
58
static const uint16_t bfu_start_short[52] = {
59
      0,  32,  64,  96,   8,  40,  72, 104,  12,  44,  76, 108,  20,  52,  84, 116, 26, 58, 90, 122,
60
    128, 160, 192, 224, 134, 166, 198, 230, 141, 173, 205, 237, 150, 182, 214, 246,
61
    256, 288, 320, 352, 384, 416, 448, 480, 268, 300, 332, 364, 396, 428, 460, 492
62
};
63

    
64
#endif /* AVCODEC_ATRAC1DATA_H */