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1 /*
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2 Extended Audio Converter for SDL (Simple DirectMedia Layer)
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3 Copyright (C) 2002 Frank Ranostaj
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4 Institute of Applied Physik
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5 Johann Wolfgang Goethe-Universität
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6 Frankfurt am Main, Germany
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7
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8 This library is free software; you can redistribute it and/or
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9 modify it under the terms of the GNU Library General Public
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10 License as published by the Free Software Foundation; either
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11 version 2 of the License, or (at your option) any later version.
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12
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13 This library is distributed in the hope that it will be useful,
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 Library General Public License for more details.
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17
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18 You should have received a copy of the GNU Library General Public
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19 License along with this library; if not, write to the Free
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20 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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21
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22 Frank Ranostaj
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23 ranostaj@stud.uni-frankfurt.de
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24 */
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25
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26 #ifndef Suffix
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27 #error include filter_template.h with defined Suffix macro!
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28 #else
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29 #define CH(x) (Suffix((x)*))
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30 //---------------------------------------------------------------------------
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31 int Suffix(_doubleRate)( short *buffer, int mode, int length )
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32 {
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33 const fsize = _fsize/2;
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34 int i,di,border;
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35 short inbuffer[_fsize];
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36
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37 if( mode & SDL_AI_Loop )
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38 {
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39 for( i = 0; i < fsize; i++ )
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40 {
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41 inbuffer[CH(i+fsize)] = buffer[CH(length+i)] = buffer[CH(i)];
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42 inbuffer[CH(i)] = buffer[CH(length-fsize+i)];
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43 }
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44 border = 0;
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45 }
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46 else
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47 {
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48 for( i = 0; i < fsize; i++ )
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49 {
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50 inbuffer[CH(i)] = buffer[CH(length+i)] = 0;
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51 inbuffer[CH(i+fsize)] = buffer[CH(i)];
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52 }
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53 border = fsize/2;
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54 }
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55
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56 for(i = length + border - 1; i >= -border; i--)
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57 {
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58 const short* const inp = i < fsize/2 ?
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59 &inbuffer[CH(i+fsize)] : &buffer[CH(i)];
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60 short* const outp = &buffer[CH(2*(i+border))];
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61 int out = 0;
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62
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63 for( di = 1; di < 1+fsize; di+=2 )
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64 out+= filter[di]*( inp[CH(di)/2] + inp[CH(1-di)/2] );
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65 outp[CH(1)] = ( 32770*inp[CH(1)] + out) >> 16;
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66 outp[CH(0)] = ( 32770*inp[CH(0)] + out) >> 16;
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67 }
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68 return 2*length + 4*border;
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69 }
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70
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71 //---------------------------------------------------------------------------
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72 short Suffix(filterHalfBand)( short* inp )
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73 {
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74 static const int fsize = _fsize;
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75 int out = 32770*inp[0];
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76 int di;
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77 for( di = 1; di < fsize/2; di+=2 )
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78 out+= filter[di]*( inp[CH(di)] + inp[CH(-di)] );
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79 return out >> 16;
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80 }
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81
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82 int Suffix(_halfRate)( short *buffer, int mode, int length )
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83 {
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84 static const int fsize = _fsize;
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85
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86 int i,border;
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87
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88 short inbuffer[3*_fsize];
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89 short *finp, *linp;
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90
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91 if( mode & SDL_AI_Loop )
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92 {
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93 if( length & 1 )
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94 {
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95 // do something meaningful
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96 }
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97 for( i = 0; i < fsize; i++ )
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98 {
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99 inbuffer[CH(i)] = buffer[CH(length-fsize+i)];
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100 inbuffer[CH(i+fsize)] = buffer[CH(i)];
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101 }
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102 border = 0;
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103 finp = inbuffer + CH( fsize );
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104 linp = inbuffer + CH( fsize-length );
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105 }
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106 else
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107 {
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108 for( i = 0; i < fsize; i++ )
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109 {
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110 inbuffer[CH(i)] = buffer[CH(length-fsize+i)];
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111 inbuffer[CH(i+fsize)] = 0;
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112 inbuffer[CH(i+2*fsize)] = buffer[CH(i)];
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113 }
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114 border = fsize;
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115 finp = inbuffer + CH( (3*fsize)/2 + 2*border );
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116 linp = inbuffer + CH( fsize/2 - length );
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117 }
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118
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119 length = ( length + 1 ) / 2;
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120
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121 for(i = -border; i < fsize; i++)
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122 {
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123 buffer[CH(i+border)] = Suffix(filterHalfBand)( finp+CH(2*i) );
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124 }
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125 for(; i < length-fsize; i++)
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126 {
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127 buffer[CH(i+border)] = Suffix(filterHalfBand)( buffer+CH(2*i) );
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128 }
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129 for(; i < length+border; i++)
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130 {
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131 buffer[CH(i+border)] = Suffix(filterHalfBand)( linp+CH(2*i) );
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132 }
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133 return length + 2*border;
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134 }
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135
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136 //---------------------------------------------------------------------------
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137 short Suffix(filterVarBand)( VarFilter* filt, short** inpp, char* cpos )
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138 {
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139 int di;
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140 int out = 0;
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141 short *inp = *inpp;
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142 int pos = *cpos;
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143 short *filter = filt->c[pos];
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144
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145 for( di = 0; di < 2*_fsize; di++ )
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146 out+= filter[di] * (int)inp[CH(di)];
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147
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148 *inpp += CH(filt->incr[pos]);
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149 *cpos = ( pos + 1 ) % filt->pos_mod;
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150 return out >> 16;
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151 }
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152
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153 int Suffix(_varRateDown)( short* buffer, int mode, VarFilter* filter, int length )
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154 {
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155 static const int fsize = _fsize;
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156 int i,border;
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157 short inbuffer[CH(3*_fsize)];
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158 short *finp, *linp, *bufp, *outbuf;
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159 char pos = 0;
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160 VarFilter* filterp = filter;
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161
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162 if( mode & SDL_AI_Loop )
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163 {
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164 for( i = 0; i < fsize; i++ )
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165 {
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166 inbuffer[CH(i)] = buffer[CH(length-fsize+i)];
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167 inbuffer[CH(i+fsize)] = buffer[CH(i)];
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168 }
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169 border = 0;
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170 finp = inbuffer+CH(fsize);
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171 linp = inbuffer+CH(fsize-length);
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172 }
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173 else
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174 {
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175 for( i = 0; i < fsize; i++ )
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176 {
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177 inbuffer[CH(i)] = buffer[CH(length-fsize+i)];
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178 inbuffer[CH(i+fsize)] = 0;
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179 inbuffer[CH(i+2*fsize)] = buffer[CH(i)];
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180 }
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181 border = fsize;
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182 finp = inbuffer + CH( 3*fsize/2 );
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183 linp = inbuffer + CH( fsize/2 );
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184 }
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185
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186 length = ( length + 1 ) / 2;
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187 bufp = buffer;
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188 outbuf = buffer+CH(border);
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189
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190 for(i = -border; i < fsize; i++)
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191 {
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192 outbuf[CH(i)] = Suffix(filterVarBand)( filterp, &finp, &pos );
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193 }
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194 for(; i < length-fsize; i++)
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195 {
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196 outbuf[CH(i)] = Suffix(filterVarBand)( filterp, &bufp, &pos );
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197 }
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198 for(; i < length+border; i++)
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199 {
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200 outbuf[CH(i)] = Suffix(filterVarBand)( filterp, &linp, &pos );
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201 }
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202 return length + 2*border;
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203 }
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204
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205 int Suffix(_varRateUp)( short* buffer, int mode, VarFilter* filter, int length )
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206 {
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207 static const int fsize = _fsize;
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208 int i,border;
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209 short inbuffer[CH(3*_fsize)];
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210 short *finp, *linp, *bufp, *outbuf;
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211 char pos = 0;
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212 VarFilter* filterp = filter;
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213
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214 if( mode & SDL_AI_Loop )
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215 {
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216 for( i = 0; i < fsize; i++ )
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217 {
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218 inbuffer[CH(i)] = buffer[CH(length-fsize+i)];
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219 inbuffer[CH(i+fsize)] = buffer[CH(i)];
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220 }
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221 border = 0;
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222 finp = inbuffer+CH(fsize);
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223 linp = inbuffer+CH(fsize-length);
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224 }
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225 else
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226 {
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227 for( i = 0; i < fsize; i++ )
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228 {
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229 inbuffer[CH(i)] = buffer[CH(length-fsize+i)];
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230 inbuffer[CH(i+fsize)] = 0;
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231 inbuffer[CH(i+2*fsize)] = buffer[CH(i)];
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232 }
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233 border = fsize;
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234 finp = inbuffer + CH( 3*fsize/2 );
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235 linp = inbuffer + CH( fsize/2 );
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236 }
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237
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238 length = 2 * length;
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239 bufp = buffer+length;
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240 outbuf = buffer+CH(border);
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241
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242 for(i = length+border-1; i > length-fsize-1; i--)
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243 {
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244 outbuf[CH(i)] = Suffix(filterVarBand)( filterp, &linp, &pos );
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245 }
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246 for(; i > fsize-1 ; i--)
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247 {
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248 outbuf[CH(i)] = Suffix(filterVarBand)( filterp, &bufp, &pos );
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249 }
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250 for(; i > -border-1; i--)
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251 {
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252 outbuf[CH(i)] = Suffix(filterVarBand)( filterp, &finp, &pos );
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253 }
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254 return length + 2*border;
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255 }
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256 //---------------------------------------------------------------------------
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257 #undef CH
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258 #endif /* Suffix */
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