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1 /* |
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2 * LIBOIL - Library of Optimized Inner Loops |
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3 * Copyright (c) 2003,2004 David A. Schleef <ds@schleef.org> |
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4 * All rights reserved. |
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5 * |
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6 * Redistribution and use in source and binary forms, with or without |
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7 * modification, are permitted provided that the following conditions |
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8 * are met: |
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9 * 1. Redistributions of source code must retain the above copyright |
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10 * notice, this list of conditions and the following disclaimer. |
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11 * 2. Redistributions in binary form must reproduce the above copyright |
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12 * notice, this list of conditions and the following disclaimer in the |
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13 * documentation and/or other materials provided with the distribution. |
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14 * |
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15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, |
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19 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
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21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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23 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
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24 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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25 * POSSIBILITY OF SUCH DAMAGE. |
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26 */ |
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27 //Portions Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. |
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28 |
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29 #ifdef HAVE_CONFIG_H |
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30 #include "config.h" |
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31 #endif |
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32 |
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33 #include <liboil/liboilfunction.h> |
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34 #include "liboil/dct/dct.h" |
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35 #include <math.h> |
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36 |
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37 /** |
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38 * oil_idct8_f64: |
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39 * @d_8: |
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40 * @dstr: |
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41 * @s_8: |
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42 * @sstr: |
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43 * |
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44 * Performs a Inverse Discrete Cosine Transform on @s_8 and places |
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45 * the result in @d_8. |
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46 */ |
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47 OIL_DEFINE_CLASS (idct8_f64, "double *d_8, int dstr, double *s_8, int sstr"); |
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48 |
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49 #define C0_9808 0.980785280 |
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50 #define C0_9239 0.923879532 |
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51 #define C0_8315 0.831469612 |
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52 #define C0_7071 0.707106781 |
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53 #define C0_5556 0.555570233 |
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54 #define C0_3827 0.382683432 |
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55 #define C0_1951 0.195090322 |
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56 |
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57 static void idct8_f64_ref(double *dest, int dstr, const double *src, int sstr) |
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58 { |
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59 static double idct_coeff[8][8]; |
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60 static int idct_coeff_init = 0; |
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61 int i,j; |
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62 double x; |
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63 |
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64 if(!idct_coeff_init){ |
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65 double scale; |
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66 |
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67 for(i=0;i<8;i++){ |
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68 scale = (i==0) ? sqrt(0.125) : 0.5; |
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69 for(j=0;j<8;j++){ |
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70 idct_coeff[j][i] = scale * |
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71 cos((M_PI/8)*i*(j+0.5)); |
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72 } |
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73 } |
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74 idct_coeff_init = 1; |
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75 } |
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76 |
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77 for(i=0;i<8;i++){ |
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78 x = 0; |
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79 for(j=0;j<8;j++){ |
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80 x += idct_coeff[i][j] * OIL_GET (src, sstr*j, double); |
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81 } |
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82 OIL_GET (dest, dstr*i, double) = x; |
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83 } |
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84 } |
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85 |
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86 OIL_DEFINE_IMPL_REF (idct8_f64_ref, idct8_f64); |
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87 |
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88 |
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89 static void idct8_f64_fastx(double *dest, int dstr, const double *src, int sstr) |
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90 { |
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91 double s07, s16, s25, s34; |
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92 double d07, d16, d25, d34; |
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93 double ss07s34, ss16s25; |
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94 double ds07s34, ds16s25; |
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95 |
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96 ss07s34 = C0_7071*(OIL_GET(src,sstr*0, double) + OIL_GET(src,sstr*4, double)); |
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97 ss16s25 = C0_7071*(OIL_GET(src,sstr*0, double) - OIL_GET(src,sstr*4, double)); |
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98 |
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99 ds07s34 = C0_9239* OIL_GET(src,sstr*2, double) + C0_3827* OIL_GET(src,sstr*6, double); |
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100 ds16s25 = C0_3827* OIL_GET(src,sstr*2, double) - C0_9239* OIL_GET(src,sstr*6, double); |
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101 |
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102 s07 = ss07s34 + ds07s34; |
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103 s34 = ss07s34 - ds07s34; |
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104 |
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105 s16 = ss16s25 + ds16s25; |
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106 s25 = ss16s25 - ds16s25; |
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107 |
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108 d07 = C0_9808* OIL_GET(src,sstr*1, double) + C0_8315* OIL_GET(src,sstr*3, double) |
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109 + C0_5556* OIL_GET(src,sstr*5, double) + C0_1951* OIL_GET(src,sstr*7, double); |
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110 d16 = C0_8315* OIL_GET(src,sstr*1, double) - C0_1951* OIL_GET(src,sstr*3, double) |
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111 - C0_9808* OIL_GET(src,sstr*5, double) - C0_5556* OIL_GET(src,sstr*7, double); |
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112 d25 = C0_5556* OIL_GET(src,sstr*1, double) - C0_9808* OIL_GET(src,sstr*3, double) |
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113 + C0_1951* OIL_GET(src,sstr*5, double) + C0_8315* OIL_GET(src,sstr*7, double); |
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114 d34 = C0_1951* OIL_GET(src,sstr*1, double) - C0_5556* OIL_GET(src,sstr*3, double) |
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115 + C0_8315* OIL_GET(src,sstr*5, double) - C0_9808* OIL_GET(src,sstr*7, double); |
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116 |
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117 OIL_GET(dest,dstr*0, double) = 0.5 * (s07 + d07); |
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118 OIL_GET(dest,dstr*1, double) = 0.5 * (s16 + d16); |
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119 OIL_GET(dest,dstr*2, double) = 0.5 * (s25 + d25); |
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120 OIL_GET(dest,dstr*3, double) = 0.5 * (s34 + d34); |
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121 OIL_GET(dest,dstr*4, double) = 0.5 * (s34 - d34); |
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122 OIL_GET(dest,dstr*5, double) = 0.5 * (s25 - d25); |
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123 OIL_GET(dest,dstr*6, double) = 0.5 * (s16 - d16); |
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124 OIL_GET(dest,dstr*7, double) = 0.5 * (s07 - d07); |
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125 |
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126 } |
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127 |
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128 OIL_DEFINE_IMPL (idct8_f64_fastx, idct8_f64); |
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129 |
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130 |
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131 |
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132 |
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133 #ifdef __SYMBIAN32__ |
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134 |
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135 OilFunctionClass* __oil_function_class_idct8_f64() { |
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136 return &_oil_function_class_idct8_f64; |
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137 } |
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138 #endif |
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139 |
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140 |
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141 |
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142 #ifdef __SYMBIAN32__ |
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143 |
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144 OilFunctionImpl* __oil_function_impl_idct8_f64_ref() { |
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145 return &_oil_function_impl_idct8_f64_ref; |
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146 } |
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147 #endif |
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148 |
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149 #ifdef __SYMBIAN32__ |
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150 |
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151 OilFunctionImpl* __oil_function_impl_idct8_f64_fastx() { |
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152 return &_oil_function_impl_idct8_f64_fastx; |
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153 } |
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154 #endif |
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155 |
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156 |
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157 |
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158 #ifdef __SYMBIAN32__ |
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159 |
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160 EXPORT_C void** _oil_function_class_ptr_idct8_f64 () { |
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161 oil_function_class_ptr_idct8_f64 = __oil_function_class_idct8_f64(); |
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162 return &oil_function_class_ptr_idct8_f64->func; |
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163 } |
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164 #endif |
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165 |