2 * Atrac 1 compatible decoder data
3 * Copyright (c) 2009 Maxim Poliakovski
4 * Copyright (c) 2009 Benjamin Larsson
6 * This file is part of FFmpeg.
8 * FFmpeg 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.
13 * FFmpeg 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.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 * Atrac 1 compatible decoder data
28 #ifndef AVCODEC_ATRAC1DATA_H
29 #define AVCODEC_ATRAC1DATA_H
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};
37 /** number of BFUs in each QMF band */
38 static const uint8_t bfu_bands_t
[4] = {0, 20, 36, 52};
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
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
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,
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
64 #endif /* AVCODEC_ATRAC1DATA_H */