63 lines
2.6 KiB
C
63 lines
2.6 KiB
C
/*
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* Atrac 1 compatible decoder data
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* Copyright (c) 2009 Maxim Poliakovski
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* Copyright (c) 2009 Benjamin Larsson
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file libavcodec/atrac1data.h
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* Atrac 1 compatible decoder data
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*/
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#ifndef AVCODEC_ATRAC1DATA_H
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#define AVCODEC_ATRAC1DATA_H
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static const uint8_t bfu_amount_tab1[8] = {20, 28, 32, 36, 40, 44, 48, 52};
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static const uint8_t bfu_amount_tab2[4] = { 0, 112, 176, 208};
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static const uint8_t bfu_amount_tab3[8] = { 0, 24, 36, 48, 72, 108, 132, 156};
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/** number of BFUs in each QMF band */
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static const uint8_t bfu_bands_t[4] = {0, 20, 36, 52};
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/** number of spectral lines in each BFU
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* block floating unit = group of spectral frequencies having the
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* same quantization parameters like word length and scale factor
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*/
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static const uint8_t specs_per_bfu[52] = {
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8, 8, 8, 8, 4, 4, 4, 4, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, // low band
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6, 6, 6, 6, 7, 7, 7, 7, 9, 9, 9, 9, 10, 10, 10, 10, // midle band
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12, 12, 12, 12, 12, 12, 12, 12, 20, 20, 20, 20, 20, 20, 20, 20 // high band
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};
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/** start position of each BFU in the MDCT spectrum for the long mode */
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static const uint16_t bfu_start_long[52] = {
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0, 8, 16, 24, 32, 36, 40, 44, 48, 56, 64, 72, 80, 86, 92, 98, 104, 110, 116, 122,
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128, 134, 140, 146, 152, 159, 166, 173, 180, 189, 198, 207, 216, 226, 236, 246,
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256, 268, 280, 292, 304, 316, 328, 340, 352, 372, 392, 412, 432, 452, 472, 492,
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};
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/** start position of each BFU in the MDCT spectrum for the short mode */
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static const uint16_t bfu_start_short[52] = {
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0, 32, 64, 96, 8, 40, 72, 104, 12, 44, 76, 108, 20, 52, 84, 116, 26, 58, 90, 122,
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128, 160, 192, 224, 134, 166, 198, 230, 141, 173, 205, 237, 150, 182, 214, 246,
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256, 288, 320, 352, 384, 416, 448, 480, 268, 300, 332, 364, 396, 428, 460, 492
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};
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#endif /* AVCODEC_ATRAC1DATA_H */
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