136 lines
1.4 KiB
C
Executable file
136 lines
1.4 KiB
C
Executable file
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* This file is only included exactly once!
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*
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* The tables here are derived from the tas3004 datasheet,
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* modulo typo corrections and some smoothing...
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*/
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#define TAS3004_TREBLE_MIN 0
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#define TAS3004_TREBLE_MAX 72
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#define TAS3004_BASS_MIN 0
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#define TAS3004_BASS_MAX 72
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#define TAS3004_TREBLE_ZERO 36
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#define TAS3004_BASS_ZERO 36
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static u8 tas3004_treble_table[] = {
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150, /* -18 dB */
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149,
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148,
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147,
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146,
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145,
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144,
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143,
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142,
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141,
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140,
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139,
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138,
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137,
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136,
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135,
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134,
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133,
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132,
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131,
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130,
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129,
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128,
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127,
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126,
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125,
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124,
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123,
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122,
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121,
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120,
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119,
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118,
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117,
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116,
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115,
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114, /* 0 dB */
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113,
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112,
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111,
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109,
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108,
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107,
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105,
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104,
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103,
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101,
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99,
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98,
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96,
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93,
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91,
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89,
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86,
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83,
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81,
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77,
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74,
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71,
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67,
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63,
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59,
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54,
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49,
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44,
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38,
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32,
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26,
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19,
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10,
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4,
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2,
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1, /* +18 dB */
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};
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static inline u8 tas3004_treble(int idx)
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{
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return tas3004_treble_table[idx];
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}
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/* I only save the difference here to the treble table
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* so that the binary is smaller...
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* I have also ignored completely differences of
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* +/- 1
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*/
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static s8 tas3004_bass_diff_to_treble[] = {
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2, /* 7 dB, offset 50 */
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2,
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2,
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2,
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2,
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1,
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2,
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2,
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2,
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3,
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4,
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4,
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5,
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6,
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7,
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8,
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9,
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10,
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11,
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14,
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13,
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8,
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1, /* 18 dB */
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};
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static inline u8 tas3004_bass(int idx)
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{
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u8 result = tas3004_treble_table[idx];
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if (idx >= 50)
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result += tas3004_bass_diff_to_treble[idx-50];
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return result;
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}
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