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Rev | Author | Line No. | Line |
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576 | serge | 1 | /* |
2 | dct64_i486.c: DCT64, a plain C variant for i486 |
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3 | |||
4 | copyright 1998-2006 by the mpg123 project - free software under the terms of the LGPL 2.1 |
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5 | see COPYING and AUTHORS files in distribution or http://mpg123.de |
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6 | initially written by Fabrice Bellard |
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7 | */ |
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8 | |||
9 | /* Discrete Cosine Tansform (DCT) for subband synthesis. |
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10 | * |
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11 | * This code is optimized for 80486. It should be compiled with gcc |
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12 | * 2.7.2 or higher. |
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13 | * |
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14 | * Note: This code does not give the necessary accuracy. Moreover, no |
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15 | * overflow test are done. |
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16 | * |
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17 | * (c) 1998 Fabrice Bellard. |
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18 | */ |
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19 | |||
20 | #include "mpg123.h" |
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21 | |||
22 | #define COS_0_0 16403 |
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23 | #define COS_0_1 16563 |
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24 | #define COS_0_2 16890 |
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25 | #define COS_0_3 17401 |
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26 | #define COS_0_4 18124 |
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27 | #define COS_0_5 19101 |
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28 | #define COS_0_6 20398 |
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29 | #define COS_0_7 22112 |
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30 | #define COS_0_8 24396 |
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31 | #define COS_0_9 27503 |
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32 | #define COS_0_10 31869 |
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33 | #define COS_0_11 38320 |
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34 | #define COS_0_12 48633 |
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35 | #define COS_0_13 67429 |
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36 | #define COS_0_14 111660 |
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37 | #define COS_0_15 333906 |
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38 | #define COS_1_0 16463 |
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39 | #define COS_1_1 17121 |
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40 | #define COS_1_2 18577 |
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41 | #define COS_1_3 21195 |
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42 | #define COS_1_4 25826 |
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43 | #define COS_1_5 34756 |
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44 | #define COS_1_6 56441 |
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45 | #define COS_1_7 167154 |
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46 | #define COS_2_0 16704 |
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47 | #define COS_2_1 19704 |
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48 | #define COS_2_2 29490 |
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49 | #define COS_2_3 83981 |
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50 | #define COS_3_0 17733 |
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51 | #define COS_3_1 42813 |
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52 | #define COS_4_0 23170 |
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53 | |||
54 | #define SETOUT(out,n,expr) out[FIR_BUFFER_SIZE*(n)]=(expr) |
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55 | #define MULL(a,b) (((long)(a)*(long)(b)) >> 15) |
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56 | #define MUL(a,b) \ |
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57 | (\ |
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58 | ((!(b & 0x3F)) ? (((a)*(b >> 6)) >> 9) :\ |
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59 | ((!(b & 0x1F)) ? (((a)*(b >> 5)) >> 10) :\ |
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60 | ((!(b & 0x0F)) ? (((a)*(b >> 4)) >> 11) :\ |
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61 | ((!(b & 0x07)) ? (((a)*(b >> 3)) >> 12) :\ |
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62 | ((!(b & 0x03)) ? (((a)*(b >> 2)) >> 13) :\ |
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63 | ((!(b & 0x01)) ? (((a)*(b >> 1)) >> 14) :\ |
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64 | (((a)*(b )) >> 15)))))))) |
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65 | |||
66 | |||
67 | void dct64_1_486(int *out0,int *out1,int *b1,int *b2) |
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68 | { |
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69 | b1[0x00] = b2[0x00] + b2[0x1F]; |
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70 | b1[0x1F] = MUL((b2[0x00] - b2[0x1F]),COS_0_0); |
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71 | |||
72 | b1[0x01] = b2[0x01] + b2[0x1E]; |
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73 | b1[0x1E] = MUL((b2[0x01] - b2[0x1E]),COS_0_1); |
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74 | |||
75 | b1[0x02] = b2[0x02] + b2[0x1D]; |
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76 | b1[0x1D] = MUL((b2[0x02] - b2[0x1D]),COS_0_2); |
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77 | |||
78 | b1[0x03] = b2[0x03] + b2[0x1C]; |
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79 | b1[0x1C] = MUL((b2[0x03] - b2[0x1C]),COS_0_3); |
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80 | |||
81 | b1[0x04] = b2[0x04] + b2[0x1B]; |
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82 | b1[0x1B] = MUL((b2[0x04] - b2[0x1B]),COS_0_4); |
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83 | |||
84 | b1[0x05] = b2[0x05] + b2[0x1A]; |
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85 | b1[0x1A] = MUL((b2[0x05] - b2[0x1A]),COS_0_5); |
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86 | |||
87 | b1[0x06] = b2[0x06] + b2[0x19]; |
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88 | b1[0x19] = MUL((b2[0x06] - b2[0x19]),COS_0_6); |
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89 | |||
90 | b1[0x07] = b2[0x07] + b2[0x18]; |
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91 | b1[0x18] = MUL((b2[0x07] - b2[0x18]),COS_0_7); |
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92 | |||
93 | b1[0x08] = b2[0x08] + b2[0x17]; |
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94 | b1[0x17] = MUL((b2[0x08] - b2[0x17]),COS_0_8); |
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95 | |||
96 | b1[0x09] = b2[0x09] + b2[0x16]; |
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97 | b1[0x16] = MUL((b2[0x09] - b2[0x16]),COS_0_9); |
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98 | |||
99 | b1[0x0A] = b2[0x0A] + b2[0x15]; |
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100 | b1[0x15] = MUL((b2[0x0A] - b2[0x15]),COS_0_10); |
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101 | |||
102 | b1[0x0B] = b2[0x0B] + b2[0x14]; |
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103 | b1[0x14] = MUL((b2[0x0B] - b2[0x14]),COS_0_11); |
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104 | |||
105 | b1[0x0C] = b2[0x0C] + b2[0x13]; |
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106 | b1[0x13] = MUL((b2[0x0C] - b2[0x13]),COS_0_12); |
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107 | |||
108 | b1[0x0D] = b2[0x0D] + b2[0x12]; |
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109 | b1[0x12] = MULL((b2[0x0D] - b2[0x12]),COS_0_13); |
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110 | |||
111 | b1[0x0E] = b2[0x0E] + b2[0x11]; |
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112 | b1[0x11] = MULL((b2[0x0E] - b2[0x11]),COS_0_14); |
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113 | |||
114 | b1[0x0F] = b2[0x0F] + b2[0x10]; |
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115 | b1[0x10] = MULL((b2[0x0F] - b2[0x10]),COS_0_15); |
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116 | |||
117 | |||
118 | b2[0x00] = b1[0x00] + b1[0x0F]; |
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119 | b2[0x0F] = MUL((b1[0x00] - b1[0x0F]),COS_1_0); |
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120 | b2[0x01] = b1[0x01] + b1[0x0E]; |
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121 | b2[0x0E] = MUL((b1[0x01] - b1[0x0E]),COS_1_1); |
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122 | b2[0x02] = b1[0x02] + b1[0x0D]; |
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123 | b2[0x0D] = MUL((b1[0x02] - b1[0x0D]),COS_1_2); |
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124 | b2[0x03] = b1[0x03] + b1[0x0C]; |
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125 | b2[0x0C] = MUL((b1[0x03] - b1[0x0C]),COS_1_3); |
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126 | b2[0x04] = b1[0x04] + b1[0x0B]; |
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127 | b2[0x0B] = MUL((b1[0x04] - b1[0x0B]),COS_1_4); |
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128 | b2[0x05] = b1[0x05] + b1[0x0A]; |
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129 | b2[0x0A] = MUL((b1[0x05] - b1[0x0A]),COS_1_5); |
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130 | b2[0x06] = b1[0x06] + b1[0x09]; |
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131 | b2[0x09] = MUL((b1[0x06] - b1[0x09]),COS_1_6); |
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132 | b2[0x07] = b1[0x07] + b1[0x08]; |
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133 | b2[0x08] = MULL((b1[0x07] - b1[0x08]),COS_1_7); |
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134 | |||
135 | b2[0x10] = b1[0x10] + b1[0x1F]; |
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136 | b2[0x1F] = MUL((b1[0x1F] - b1[0x10]),COS_1_0); |
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137 | b2[0x11] = b1[0x11] + b1[0x1E]; |
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138 | b2[0x1E] = MUL((b1[0x1E] - b1[0x11]),COS_1_1); |
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139 | b2[0x12] = b1[0x12] + b1[0x1D]; |
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140 | b2[0x1D] = MUL((b1[0x1D] - b1[0x12]),COS_1_2); |
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141 | b2[0x13] = b1[0x13] + b1[0x1C]; |
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142 | b2[0x1C] = MUL((b1[0x1C] - b1[0x13]),COS_1_3); |
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143 | b2[0x14] = b1[0x14] + b1[0x1B]; |
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144 | b2[0x1B] = MUL((b1[0x1B] - b1[0x14]),COS_1_4); |
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145 | b2[0x15] = b1[0x15] + b1[0x1A]; |
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146 | b2[0x1A] = MUL((b1[0x1A] - b1[0x15]),COS_1_5); |
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147 | b2[0x16] = b1[0x16] + b1[0x19]; |
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148 | b2[0x19] = MUL((b1[0x19] - b1[0x16]),COS_1_6); |
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149 | b2[0x17] = b1[0x17] + b1[0x18]; |
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150 | b2[0x18] = MULL((b1[0x18] - b1[0x17]),COS_1_7); |
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151 | |||
152 | |||
153 | b1[0x00] = b2[0x00] + b2[0x07]; |
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154 | b1[0x07] = MUL((b2[0x00] - b2[0x07]),COS_2_0); |
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155 | b1[0x01] = b2[0x01] + b2[0x06]; |
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156 | b1[0x06] = MUL((b2[0x01] - b2[0x06]),COS_2_1); |
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157 | b1[0x02] = b2[0x02] + b2[0x05]; |
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158 | b1[0x05] = MUL((b2[0x02] - b2[0x05]),COS_2_2); |
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159 | b1[0x03] = b2[0x03] + b2[0x04]; |
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160 | b1[0x04] = MULL((b2[0x03] - b2[0x04]),COS_2_3); |
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161 | |||
162 | b1[0x08] = b2[0x08] + b2[0x0F]; |
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163 | b1[0x0F] = MUL((b2[0x0F] - b2[0x08]),COS_2_0); |
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164 | b1[0x09] = b2[0x09] + b2[0x0E]; |
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165 | b1[0x0E] = MUL((b2[0x0E] - b2[0x09]),COS_2_1); |
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166 | b1[0x0A] = b2[0x0A] + b2[0x0D]; |
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167 | b1[0x0D] = MUL((b2[0x0D] - b2[0x0A]),COS_2_2); |
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168 | b1[0x0B] = b2[0x0B] + b2[0x0C]; |
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169 | b1[0x0C] = MULL((b2[0x0C] - b2[0x0B]),COS_2_3); |
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170 | |||
171 | b1[0x10] = b2[0x10] + b2[0x17]; |
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172 | b1[0x17] = MUL((b2[0x10] - b2[0x17]),COS_2_0); |
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173 | b1[0x11] = b2[0x11] + b2[0x16]; |
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174 | b1[0x16] = MUL((b2[0x11] - b2[0x16]),COS_2_1); |
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175 | b1[0x12] = b2[0x12] + b2[0x15]; |
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176 | b1[0x15] = MUL((b2[0x12] - b2[0x15]),COS_2_2); |
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177 | b1[0x13] = b2[0x13] + b2[0x14]; |
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178 | b1[0x14] = MULL((b2[0x13] - b2[0x14]),COS_2_3); |
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179 | |||
180 | b1[0x18] = b2[0x18] + b2[0x1F]; |
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181 | b1[0x1F] = MUL((b2[0x1F] - b2[0x18]),COS_2_0); |
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182 | b1[0x19] = b2[0x19] + b2[0x1E]; |
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183 | b1[0x1E] = MUL((b2[0x1E] - b2[0x19]),COS_2_1); |
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184 | b1[0x1A] = b2[0x1A] + b2[0x1D]; |
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185 | b1[0x1D] = MUL((b2[0x1D] - b2[0x1A]),COS_2_2); |
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186 | b1[0x1B] = b2[0x1B] + b2[0x1C]; |
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187 | b1[0x1C] = MULL((b2[0x1C] - b2[0x1B]),COS_2_3); |
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188 | |||
189 | |||
190 | b2[0x00] = b1[0x00] + b1[0x03]; |
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191 | b2[0x03] = MUL((b1[0x00] - b1[0x03]),COS_3_0); |
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192 | b2[0x01] = b1[0x01] + b1[0x02]; |
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193 | b2[0x02] = MUL((b1[0x01] - b1[0x02]),COS_3_1); |
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194 | |||
195 | b2[0x04] = b1[0x04] + b1[0x07]; |
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196 | b2[0x07] = MUL((b1[0x07] - b1[0x04]),COS_3_0); |
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197 | b2[0x05] = b1[0x05] + b1[0x06]; |
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198 | b2[0x06] = MUL((b1[0x06] - b1[0x05]),COS_3_1); |
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199 | |||
200 | b2[0x08] = b1[0x08] + b1[0x0B]; |
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201 | b2[0x0B] = MUL((b1[0x08] - b1[0x0B]),COS_3_0); |
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202 | b2[0x09] = b1[0x09] + b1[0x0A]; |
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203 | b2[0x0A] = MUL((b1[0x09] - b1[0x0A]),COS_3_1); |
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204 | |||
205 | b2[0x0C] = b1[0x0C] + b1[0x0F]; |
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206 | b2[0x0F] = MUL((b1[0x0F] - b1[0x0C]),COS_3_0); |
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207 | b2[0x0D] = b1[0x0D] + b1[0x0E]; |
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208 | b2[0x0E] = MUL((b1[0x0E] - b1[0x0D]),COS_3_1); |
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209 | |||
210 | b2[0x10] = b1[0x10] + b1[0x13]; |
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211 | b2[0x13] = MUL((b1[0x10] - b1[0x13]),COS_3_0); |
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212 | b2[0x11] = b1[0x11] + b1[0x12]; |
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213 | b2[0x12] = MUL((b1[0x11] - b1[0x12]),COS_3_1); |
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214 | |||
215 | b2[0x14] = b1[0x14] + b1[0x17]; |
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216 | b2[0x17] = MUL((b1[0x17] - b1[0x14]),COS_3_0); |
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217 | b2[0x15] = b1[0x15] + b1[0x16]; |
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218 | b2[0x16] = MUL((b1[0x16] - b1[0x15]),COS_3_1); |
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219 | |||
220 | b2[0x18] = b1[0x18] + b1[0x1B]; |
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221 | b2[0x1B] = MUL((b1[0x18] - b1[0x1B]),COS_3_0); |
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222 | b2[0x19] = b1[0x19] + b1[0x1A]; |
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223 | b2[0x1A] = MUL((b1[0x19] - b1[0x1A]),COS_3_1); |
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224 | |||
225 | b2[0x1C] = b1[0x1C] + b1[0x1F]; |
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226 | b2[0x1F] = MUL((b1[0x1F] - b1[0x1C]),COS_3_0); |
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227 | b2[0x1D] = b1[0x1D] + b1[0x1E]; |
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228 | b2[0x1E] = MUL((b1[0x1E] - b1[0x1D]),COS_3_1); |
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229 | |||
230 | { |
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231 | int i; |
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232 | for(i=0;i<32;i+=4) { |
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233 | b1[i+0x00] = b2[i+0x00] + b2[i+0x01]; |
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234 | b1[i+0x01] = MUL((b2[i+0x00] - b2[i+0x01]),COS_4_0); |
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235 | b1[i+0x02] = b2[i+0x02] + b2[i+0x03]; |
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236 | b1[i+0x03] = MUL((b2[i+0x03] - b2[i+0x02]),COS_4_0); |
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237 | } |
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238 | } |
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239 | |||
240 | b1[0x02] += b1[0x03]; |
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241 | b1[0x06] += b1[0x07]; |
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242 | b1[0x04] += b1[0x06]; |
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243 | b1[0x06] += b1[0x05]; |
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244 | b1[0x05] += b1[0x07]; |
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245 | |||
246 | b1[0x0A] += b1[0x0B]; |
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247 | b1[0x0E] += b1[0x0F]; |
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248 | b1[0x0C] += b1[0x0E]; |
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249 | b1[0x0E] += b1[0x0D]; |
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250 | b1[0x0D] += b1[0x0F]; |
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251 | |||
252 | b1[0x12] += b1[0x13]; |
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253 | b1[0x16] += b1[0x17]; |
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254 | b1[0x14] += b1[0x16]; |
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255 | b1[0x16] += b1[0x15]; |
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256 | b1[0x15] += b1[0x17]; |
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257 | |||
258 | b1[0x1A] += b1[0x1B]; |
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259 | b1[0x1E] += b1[0x1F]; |
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260 | b1[0x1C] += b1[0x1E]; |
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261 | b1[0x1E] += b1[0x1D]; |
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262 | b1[0x1D] += b1[0x1F]; |
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263 | |||
264 | SETOUT(out0,16,b1[0x00]); |
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265 | SETOUT(out0,12,b1[0x04]); |
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266 | SETOUT(out0, 8,b1[0x02]); |
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267 | SETOUT(out0, 4,b1[0x06]); |
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268 | SETOUT(out0, 0,b1[0x01]); |
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269 | SETOUT(out1, 0,b1[0x01]); |
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270 | SETOUT(out1, 4,b1[0x05]); |
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271 | SETOUT(out1, 8,b1[0x03]); |
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272 | SETOUT(out1,12,b1[0x07]); |
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273 | |||
274 | b1[0x08] += b1[0x0C]; |
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275 | SETOUT(out0,14,b1[0x08]); |
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276 | b1[0x0C] += b1[0x0a]; |
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277 | SETOUT(out0,10,b1[0x0C]); |
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278 | b1[0x0A] += b1[0x0E]; |
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279 | SETOUT(out0, 6,b1[0x0A]); |
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280 | b1[0x0E] += b1[0x09]; |
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281 | SETOUT(out0, 2,b1[0x0E]); |
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282 | b1[0x09] += b1[0x0D]; |
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283 | SETOUT(out1, 2,b1[0x09]); |
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284 | b1[0x0D] += b1[0x0B]; |
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285 | SETOUT(out1, 6,b1[0x0D]); |
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286 | b1[0x0B] += b1[0x0F]; |
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287 | SETOUT(out1,10,b1[0x0B]); |
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288 | SETOUT(out1,14,b1[0x0F]); |
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289 | |||
290 | b1[0x18] += b1[0x1C]; |
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291 | SETOUT(out0,15,b1[0x10] + b1[0x18]); |
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292 | SETOUT(out0,13,b1[0x18] + b1[0x14]); |
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293 | b1[0x1C] += b1[0x1a]; |
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294 | SETOUT(out0,11,b1[0x14] + b1[0x1C]); |
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295 | SETOUT(out0, 9,b1[0x1C] + b1[0x12]); |
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296 | b1[0x1A] += b1[0x1E]; |
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297 | SETOUT(out0, 7,b1[0x12] + b1[0x1A]); |
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298 | SETOUT(out0, 5,b1[0x1A] + b1[0x16]); |
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299 | b1[0x1E] += b1[0x19]; |
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300 | SETOUT(out0, 3,b1[0x16] + b1[0x1E]); |
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301 | SETOUT(out0, 1,b1[0x1E] + b1[0x11]); |
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302 | b1[0x19] += b1[0x1D]; |
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303 | SETOUT(out1, 1,b1[0x11] + b1[0x19]); |
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304 | SETOUT(out1, 3,b1[0x19] + b1[0x15]); |
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305 | b1[0x1D] += b1[0x1B]; |
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306 | SETOUT(out1, 5,b1[0x15] + b1[0x1D]); |
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307 | SETOUT(out1, 7,b1[0x1D] + b1[0x13]); |
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308 | b1[0x1B] += b1[0x1F]; |
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309 | SETOUT(out1, 9,b1[0x13] + b1[0x1B]); |
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310 | SETOUT(out1,11,b1[0x1B] + b1[0x17]); |
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311 | SETOUT(out1,13,b1[0x17] + b1[0x1F]); |
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312 | SETOUT(out1,15,b1[0x1F]); |
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313 | } |
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314 | |||
315 | |||
316 | /* |
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317 | * the call via dct64 is a trick to force GCC to use |
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318 | * (new) registers for the b1,b2 pointer to the bufs[xx] field |
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319 | */ |
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320 | void dct64_486(int *a,int *b,real *samples) |
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321 | { |
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322 | int bufs[64]; |
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323 | int i; |
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324 | |||
325 | #ifdef REAL_IS_FIXED |
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326 | #define TOINT(a) ((a) * 32768 / (int)REAL_FACTOR) |
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327 | |||
328 | for(i=0;i<32;i++) { |
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329 | bufs[i]=TOINT(samples[i]); |
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330 | } |
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331 | #else |
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332 | int *p = bufs; |
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333 | register double const scale = ((65536.0 * 32) + 1) * 65536.0; |
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334 | |||
335 | for(i=0;i<32;i++) { |
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336 | *((double *) (p++)) = scale + *samples++; /* beware on bufs overrun: 8B store from x87 */ |
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337 | } |
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338 | #endif |
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339 | |||
340 | dct64_1_486(a,b,bufs+32,bufs); |
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341 | }32;i++)>32;i++)>32;i+=4)> |
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342 |