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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/liboilfuncs.h> |
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35 #include "liboil/dct/dct.h" |
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36 |
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37 |
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38 |
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39 #define C0_9808 0.980785280 |
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40 #define C0_9239 0.923879532 |
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41 #define C0_8315 0.831469612 |
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42 #define C0_7071 0.707106781 |
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43 #define C0_5556 0.555570233 |
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44 #define C0_3827 0.382683432 |
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45 #define C0_1951 0.195090322 |
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46 |
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47 /** |
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48 * oil_fdct8x8s_s16: |
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49 * @d_8x8: |
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50 * @ds: |
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51 * @s_8x8: |
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52 * @ss: |
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53 * |
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54 * Performs a 2-D Forward Discrete Cosine Transform on @s_8x8 and places |
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55 * the result in @d_8x8. |
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56 * |
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57 * This function uses an alternate scaling used by RTjpeg. |
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58 */ |
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59 OIL_DEFINE_CLASS(fdct8x8s_s16, |
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60 "int16_t *d_8x8, int ds, int16_t *s_8x8, int ss"); |
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61 |
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62 #if defined(oil_fdct8x8_f64) && defined(oil_conv8x8_s16_f64) |
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63 static void |
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64 fdct8x8s_s16_ref (int16_t *dest, int dstr, const int16_t *src, int sstr) |
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65 { |
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66 double s[64], d[64]; |
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67 double scale[8] = { |
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68 4*C0_7071, |
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69 4*C0_9808, |
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70 4*C0_9239, |
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71 4*C0_8315, |
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72 4*C0_7071, |
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73 4*C0_5556, |
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74 4*C0_3827, |
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75 4*C0_1951, |
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76 }; |
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77 int i,j; |
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78 |
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79 for(i=0;i<8;i++){ |
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80 for(j=0;j<8;j++){ |
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81 s[8*i+j] = OIL_GET (src,sstr*i+j*sizeof(int16_t), int16_t); |
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82 } |
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83 } |
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84 |
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85 oil_fdct8x8_f64(d,8*sizeof(double),s,8*sizeof(double)); |
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86 |
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87 for(i=0;i<8;i++){ |
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88 for(j=0;j<8;j++){ |
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89 d[8*i+j] *= scale[i] * scale[j]; |
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90 } |
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91 } |
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92 |
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93 oil_conv8x8_s16_f64(dest,dstr,d,8*sizeof(double)); |
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94 } |
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95 |
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96 OIL_DEFINE_IMPL_REF (fdct8x8s_s16_ref, fdct8x8s_s16); |
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97 #endif |
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98 |
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99 |
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100 |
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101 |
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102 #ifdef __SYMBIAN32__ |
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103 |
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104 OilFunctionClass* __oil_function_class_fdct8x8s_s16() { |
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105 return &_oil_function_class_fdct8x8s_s16; |
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106 } |
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107 #endif |
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108 |
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109 |
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110 |
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111 #ifdef __SYMBIAN32__ |
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112 |
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113 OilFunctionImpl* __oil_function_impl_fdct8x8s_s16_ref() { |
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114 return &_oil_function_impl_fdct8x8s_s16_ref; |
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115 } |
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116 #endif |
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117 |
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118 |
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119 |
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120 #ifdef __SYMBIAN32__ |
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121 |
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122 EXPORT_C void** _oil_function_class_ptr_fdct8x8s_s16 () { |
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123 oil_function_class_ptr_fdct8x8s_s16 = __oil_function_class_fdct8x8s_s16(); |
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124 return &oil_function_class_ptr_fdct8x8s_s16->func; |
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125 } |
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126 #endif |
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127 |