frameworks/base/media/libeffects/lvm/lib/Eq/src/LVEQNB_Tables.c

   1 /*
   2  * Copyright (C) 2004-2010 NXP Software
   3  * Copyright (C) 2010 The Android Open Source Project
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *      http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18
  19 /************************************************************************************/
  20 /*                                                                                  */
  21 /*    Includes                                                                      */
  22 /*                                                                                  */
  23 /************************************************************************************/
  24
  25 #include "LVEQNB.h"
  26 #include "LVEQNB_Coeffs.h"
  27
  28
  29 /************************************************************************************/
  30 /*                                                                                  */
  31 /*    Sample rate table                                                             */
  32 /*                                                                                  */
  33 /************************************************************************************/
  34
  35 /*
  36  * Sample rate table for converting between the enumerated type and the actual
  37  * frequency
  38  */
  39 const LVM_UINT16    LVEQNB_SampleRateTab[] = {8000,                    /* 8kS/s  */
  40                                               11025,
  41                                               12000,
  42                                               16000,
  43                                               22050,
  44                                               24000,
  45                                               32000,
  46                                               44100,
  47                                               48000};                  /* 48kS/s */
  48
  49
  50 /************************************************************************************/
  51 /*                                                                                  */
  52 /*    Coefficient calculation tables                                                */
  53 /*                                                                                  */
  54 /************************************************************************************/
  55
  56 /*
  57  * Table for 2 * Pi / Fs
  58  */
  59 const LVM_INT16     LVEQNB_TwoPiOnFsTable[] = {LVEQNB_2PiOn_8000,      /* 8kS/s */
  60                                                LVEQNB_2PiOn_11025,
  61                                                LVEQNB_2PiOn_12000,
  62                                                LVEQNB_2PiOn_16000,
  63                                                LVEQNB_2PiOn_22050,
  64                                                LVEQNB_2PiOn_24000,
  65                                                LVEQNB_2PiOn_32000,
  66                                                LVEQNB_2PiOn_44100,
  67                                                LVEQNB_2PiOn_48000};    /* 48kS/s */
  68
  69 /*
  70  * Gain table
  71  */
  72 const LVM_INT16     LVEQNB_GainTable[] = {LVEQNB_Gain_Neg15_dB,        /* -15dB gain */
  73                                           LVEQNB_Gain_Neg14_dB,
  74                                           LVEQNB_Gain_Neg13_dB,
  75                                           LVEQNB_Gain_Neg12_dB,
  76                                           LVEQNB_Gain_Neg11_dB,
  77                                           LVEQNB_Gain_Neg10_dB,
  78                                           LVEQNB_Gain_Neg9_dB,
  79                                           LVEQNB_Gain_Neg8_dB,
  80                                           LVEQNB_Gain_Neg7_dB,
  81                                           LVEQNB_Gain_Neg6_dB,
  82                                           LVEQNB_Gain_Neg5_dB,
  83                                           LVEQNB_Gain_Neg4_dB,
  84                                           LVEQNB_Gain_Neg3_dB,
  85                                           LVEQNB_Gain_Neg2_dB,
  86                                           LVEQNB_Gain_Neg1_dB,
  87                                           LVEQNB_Gain_0_dB,            /* 0dB gain */
  88                                           LVEQNB_Gain_1_dB,
  89                                           LVEQNB_Gain_2_dB,
  90                                           LVEQNB_Gain_3_dB,
  91                                           LVEQNB_Gain_4_dB,
  92                                           LVEQNB_Gain_5_dB,
  93                                           LVEQNB_Gain_6_dB,
  94                                           LVEQNB_Gain_7_dB,
  95                                           LVEQNB_Gain_8_dB,
  96                                           LVEQNB_Gain_9_dB,
  97                                           LVEQNB_Gain_10_dB,
  98                                           LVEQNB_Gain_11_dB,
  99                                           LVEQNB_Gain_12_dB,
 100                                           LVEQNB_Gain_13_dB,
 101                                           LVEQNB_Gain_14_dB,
 102                                           LVEQNB_Gain_15_dB};          /* +15dB gain */
 103
 104
 105 /*
 106  * D table for 100 / (Gain + 1)
 107  */
 108 const LVM_INT16    LVEQNB_DTable[] = {LVEQNB_100D_Neg15_dB,            /* -15dB gain */
 109                                       LVEQNB_100D_Neg14_dB,
 110                                       LVEQNB_100D_Neg13_dB,
 111                                       LVEQNB_100D_Neg12_dB,
 112                                       LVEQNB_100D_Neg11_dB,
 113                                       LVEQNB_100D_Neg10_dB,
 114                                       LVEQNB_100D_Neg9_dB,
 115                                       LVEQNB_100D_Neg8_dB,
 116                                       LVEQNB_100D_Neg7_dB,
 117                                       LVEQNB_100D_Neg6_dB,
 118                                       LVEQNB_100D_Neg5_dB,
 119                                       LVEQNB_100D_Neg4_dB,
 120                                       LVEQNB_100D_Neg3_dB,
 121                                       LVEQNB_100D_Neg2_dB,
 122                                       LVEQNB_100D_Neg1_dB,
 123                                       LVEQNB_100D_0_dB};               /* 0dB gain */
 124
 125
 126 /************************************************************************************/
 127 /*                                                                                  */
 128 /*    Filter polynomial coefficients                                                */
 129 /*                                                                                  */
 130 /************************************************************************************/
 131
 132 /*
 133  * Coefficients for calculating the cosine with the equation:
 134  *
 135  *  Cos(x) = (2^Shifts)*(a0 + a1*x + a2*x^2 + a3*x^3 + a4*x^4 + a5*x^5)
 136  *
 137  * These coefficients expect the input, x, to be in the range 0 to 32768 respresenting
 138  * a range of 0 to Pi. The output is in the range 32767 to -32768 representing the range
 139  * +1.0 to -1.0
 140  */
 141 const LVM_INT16     LVEQNB_CosCoef[] = {3,                             /* Shifts */
 142                                         4096,                          /* a0 */
 143                                         -36,                           /* a1 */
 144                                         -19725,                        /* a2 */
 145                                         -2671,                         /* a3 */
 146                                         23730,                         /* a4 */
 147                                         -9490};                        /* a5 */
 148
 149 /*
 150  * Coefficients for calculating the cosine error with the equation:
 151  *
 152  *  CosErr(x) = (2^Shifts)*(a0 + a1*x + a2*x^2 + a3*x^3)
 153  *
 154  * These coefficients expect the input, x, to be in the range 0 to 32768 respresenting
 155  * a range of 0 to Pi/25. The output is in the range 0 to 32767 representing the range
 156  * 0.0 to 0.0078852986
 157  *
 158  * This is used to give a double precision cosine over the range 0 to Pi/25 using the
 159  * the equation:
 160  *
 161  * Cos(x) = 1.0 - CosErr(x)
 162  */
 163 const LVM_INT16     LVEQNB_DPCosCoef[] = {1,                           /* Shifts */
 164                                           0,                           /* a0 */
 165                                           -6,                          /* a1 */
 166                                           16586,                       /* a2 */
 167                                           -44};                        /* a3 */
 168
 169 /************************************************************************************/
 170 /*                                                                                  */
 171 /*  Bypass mixer time constants (100ms)                                             */
 172 /*                                                                                  */
 173 /************************************************************************************/
 174
 175 #define LVEQNB_MIX_TC_Fs8000    32580         /* Floating point value 0.994262695 */
 176 #define LVEQNB_MIX_TC_Fs11025   32632         /* Floating point value 0.995849609 */
 177 #define LVEQNB_MIX_TC_Fs12000   32643         /* Floating point value 0.996185303 */
 178 #define LVEQNB_MIX_TC_Fs16000   32674         /* Floating point value 0.997131348 */
 179 #define LVEQNB_MIX_TC_Fs22050   32700         /* Floating point value 0.997924805 */
 180 #define LVEQNB_MIX_TC_Fs24000   32705         /* Floating point value 0.998077393 */
 181 #define LVEQNB_MIX_TC_Fs32000   32721         /* Floating point value 0.998565674 */
 182 #define LVEQNB_MIX_TC_Fs44100   32734         /* Floating point value 0.998962402 */
 183 #define LVEQNB_MIX_TC_Fs48000   32737         /* Floating point value 0.999053955 */
 184
 185
 186 const LVM_INT16 LVEQNB_MixerTCTable[] = {
 187     LVEQNB_MIX_TC_Fs8000,
 188     LVEQNB_MIX_TC_Fs11025,
 189     LVEQNB_MIX_TC_Fs12000,
 190     LVEQNB_MIX_TC_Fs16000,
 191     LVEQNB_MIX_TC_Fs22050,
 192     LVEQNB_MIX_TC_Fs24000,
 193     LVEQNB_MIX_TC_Fs32000,
 194     LVEQNB_MIX_TC_Fs44100,
 195     LVEQNB_MIX_TC_Fs48000};