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 FFmpeg. 7 * 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. 12 * 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. 17 * 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 21 */ 22 23 /** 24 * @file 25 * ATRAC1 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, // middle 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 */ 65