65 lines
2.6 KiB
C
65 lines
2.6 KiB
C
/*
|
|
* Atrac 1 compatible decoder data
|
|
* Copyright (c) 2009 Maxim Poliakovski
|
|
* Copyright (c) 2009 Benjamin Larsson
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* Atrac 1 compatible decoder data
|
|
*/
|
|
|
|
#ifndef AVCODEC_ATRAC1DATA_H
|
|
#define AVCODEC_ATRAC1DATA_H
|
|
|
|
#include <stdint.h>
|
|
|
|
static const uint8_t bfu_amount_tab1[8] = {20, 28, 32, 36, 40, 44, 48, 52};
|
|
static const uint8_t bfu_amount_tab2[4] = { 0, 112, 176, 208};
|
|
static const uint8_t bfu_amount_tab3[8] = { 0, 24, 36, 48, 72, 108, 132, 156};
|
|
|
|
/** number of BFUs in each QMF band */
|
|
static const uint8_t bfu_bands_t[4] = {0, 20, 36, 52};
|
|
|
|
/** number of spectral lines in each BFU
|
|
* block floating unit = group of spectral frequencies having the
|
|
* same quantization parameters like word length and scale factor
|
|
*/
|
|
static const uint8_t specs_per_bfu[52] = {
|
|
8, 8, 8, 8, 4, 4, 4, 4, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, // low band
|
|
6, 6, 6, 6, 7, 7, 7, 7, 9, 9, 9, 9, 10, 10, 10, 10, // midle band
|
|
12, 12, 12, 12, 12, 12, 12, 12, 20, 20, 20, 20, 20, 20, 20, 20 // high band
|
|
};
|
|
|
|
/** start position of each BFU in the MDCT spectrum for the long mode */
|
|
static const uint16_t bfu_start_long[52] = {
|
|
0, 8, 16, 24, 32, 36, 40, 44, 48, 56, 64, 72, 80, 86, 92, 98, 104, 110, 116, 122,
|
|
128, 134, 140, 146, 152, 159, 166, 173, 180, 189, 198, 207, 216, 226, 236, 246,
|
|
256, 268, 280, 292, 304, 316, 328, 340, 352, 372, 392, 412, 432, 452, 472, 492,
|
|
};
|
|
|
|
/** start position of each BFU in the MDCT spectrum for the short mode */
|
|
static const uint16_t bfu_start_short[52] = {
|
|
0, 32, 64, 96, 8, 40, 72, 104, 12, 44, 76, 108, 20, 52, 84, 116, 26, 58, 90, 122,
|
|
128, 160, 192, 224, 134, 166, 198, 230, 141, 173, 205, 237, 150, 182, 214, 246,
|
|
256, 288, 320, 352, 384, 416, 448, 480, 268, 300, 332, 364, 396, 428, 460, 492
|
|
};
|
|
|
|
#endif /* AVCODEC_ATRAC1DATA_H */
|