annotate ffmpeg/libavcodec/atrac3data.h @ 13:844d341cf643 tip

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/*
 * Atrac 3 compatible decoder data
 * Copyright (c) 2006-2007 Maxim Poliakovski
 * Copyright (c) 2006-2007 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 3 AKA RealAudio 8 compatible decoder data
 */

#ifndef AVCODEC_ATRAC3DATA_H
#define AVCODEC_ATRAC3DATA_H

#include <stdint.h>

/* VLC tables */

static const uint8_t huffcode1[9] = {
    0x0, 0x4, 0x5, 0xC, 0xD, 0x1C, 0x1D, 0x1E, 0x1F
};

static const uint8_t huffbits1[9] = { 1, 3, 3, 4, 4, 5, 5, 5, 5 };

static const uint8_t huffcode2[5] = { 0x0, 0x4, 0x5, 0x6, 0x7 };

static const uint8_t huffbits2[5] = { 1, 3, 3, 3, 3 };

static const uint8_t huffcode3[7] = { 0x0, 0x4, 0x5, 0xC, 0xD, 0xE, 0xF };

static const uint8_t huffbits3[7] = { 1, 3, 3, 4, 4, 4, 4 };

static const uint8_t huffcode4[9] = {
    0x0, 0x4, 0x5, 0xC, 0xD, 0x1C, 0x1D, 0x1E, 0x1F
};

static const uint8_t huffbits4[9] = { 1, 3, 3, 4, 4, 5, 5, 5, 5 };

static const uint8_t huffcode5[15] = {
    0x00, 0x02, 0x03, 0x08, 0x09, 0x0A, 0x0B, 0x1C,
    0x1D, 0x3C, 0x3D, 0x3E, 0x3F, 0x0C, 0x0D
};

static const uint8_t huffbits5[15] = {
    2, 3, 3, 4, 4, 4, 4, 5, 5, 6, 6, 6, 6, 4, 4
};

static const uint8_t huffcode6[31] = {
    0x00, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x14,
    0x15, 0x16, 0x17, 0x18, 0x19, 0x34, 0x35, 0x36,
    0x37, 0x38, 0x39, 0x3A, 0x3B, 0x78, 0x79, 0x7A,
    0x7B, 0x7C, 0x7D, 0x7E, 0x7F, 0x08, 0x09
};

static const uint8_t huffbits6[31] = {
    3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 6, 6, 6,
    6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 4, 4
};

static const uint8_t huffcode7[63] = {
    0x00, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
    0x0F, 0x10, 0x11, 0x24, 0x25, 0x26, 0x27, 0x28,
    0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30,
    0x31, 0x32, 0x33, 0x68, 0x69, 0x6A, 0x6B, 0x6C,
    0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72, 0x73, 0x74,
    0x75, 0xEC, 0xED, 0xEE, 0xEF, 0xF0, 0xF1, 0xF2,
    0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0xFA,
    0xFB, 0xFC, 0xFD, 0xFE, 0xFF, 0x02, 0x03
};

static const uint8_t huffbits7[63] = {
    3, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6,
    6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7,
    7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8,
    8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 4, 4
};

static const uint8_t huff_tab_sizes[7] = {
    9, 5, 7, 9, 15, 31, 63,
};

static const uint8_t* const huff_codes[7] = {
    huffcode1, huffcode2, huffcode3, huffcode4, huffcode5, huffcode6, huffcode7
};

static const uint8_t* const huff_bits[7] = {
    huffbits1, huffbits2, huffbits3, huffbits4, huffbits5, huffbits6, huffbits7,
};

static const uint16_t atrac3_vlc_offs[9] = {
    0, 512, 1024, 1536, 2048, 2560, 3072, 3584, 4096
};

/* selector tables */

static const uint8_t clc_length_tab[8] = { 0, 4, 3, 3, 4, 4, 5, 6 };

static const int8_t mantissa_clc_tab[4] = { 0, 1, -2, -1 };

static const int8_t mantissa_vlc_tab[18] = {
    0, 0,  0, 1,  0, -1,  1, 0,  -1, 0,  1, 1,  1, -1,  -1, 1,  -1, -1
};


/* tables for the scalefactor decoding */

static const float inv_max_quant[8] = {
      0.0,       1.0 / 1.5, 1.0 /  2.5, 1.0 /  3.5,
      1.0 / 4.5, 1.0 / 7.5, 1.0 / 15.5, 1.0 / 31.5
};

static const uint16_t subband_tab[33] = {
      0,   8,  16,  24,  32,  40,  48,  56,
     64,  80,  96, 112, 128, 144, 160, 176,
    192, 224, 256, 288, 320, 352, 384, 416,
    448, 480, 512, 576, 640, 704, 768, 896,
    1024
};

/* joint stereo related tables */
static const float matrix_coeffs[8] = {
    0.0, 2.0, 2.0, 2.0, 0.0, 0.0, 1.0, 1.0
};

#endif /* AVCODEC_ATRAC3DATA_H */