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1 /* |
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2 |
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3 This file is part of Octave. |
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4 |
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5 Octave is free software; you can redistribute it and/or modify it |
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6 under the terms of the GNU General Public License as published by the |
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7 Free Software Foundation; either version 2, or (at your option) any |
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8 later version. |
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9 |
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10 Octave is distributed in the hope that it will be useful, but WITHOUT |
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11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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13 for more details. |
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14 |
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15 You should have received a copy of the GNU General Public License |
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16 along with Octave; see the file COPYING. If not, write to the Free |
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17 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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18 |
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19 */ |
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20 |
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21 #ifdef HAVE_CONFIG_H |
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22 #include <config.h> |
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23 #endif |
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24 |
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25 #ifdef HAVE_FFTW |
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26 |
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27 #include "oct-fftw.h" |
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28 #include "lo-error.h" |
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29 |
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30 |
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31 // Helper class to create and cache fftw plans for both 1d and 2d. This |
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32 // implementation uses FFTW_ESTIMATE to create the plans, which in theory |
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33 // is suboptimal, but provides quite reasonable performance. Future |
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34 // enhancement will be to add a dynamically loadable interface ("fftw") |
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35 // to manipulate fftw wisdom so that users may choose the appropriate |
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36 // planner. |
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37 |
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38 class |
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39 octave_fftw_planner |
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40 { |
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41 public: |
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42 octave_fftw_planner (); |
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43 |
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44 fftw_plan create_plan (fftw_direction, size_t); |
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45 fftwnd_plan create_plan2d (fftw_direction, size_t, size_t); |
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46 |
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47 private: |
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48 int plan_flags; |
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49 |
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50 fftw_plan plan[2]; |
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51 fftwnd_plan plan2d[2]; |
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52 |
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53 size_t n[2]; |
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54 size_t n2d[2][2]; |
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55 }; |
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56 |
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57 octave_fftw_planner::octave_fftw_planner () |
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58 { |
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59 plan_flags = FFTW_ESTIMATE; |
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60 |
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61 plan[0] = plan[1] = 0; |
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62 plan2d[0] = plan2d[1] = 0; |
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63 |
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64 n[0] = n[1] = 0; |
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65 n2d[0][0] = n2d[0][1] = n2d[1][0] = n2d[1][1] = 0; |
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66 } |
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67 |
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68 fftw_plan |
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69 octave_fftw_planner::create_plan (fftw_direction dir, size_t npts) |
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70 { |
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71 size_t which = (dir == FFTW_FORWARD) ? 0 : 1; |
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72 fftw_plan *cur_plan_p = &plan[which]; |
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73 bool create_new_plan = false; |
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74 |
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75 if (plan[which] == 0 || n[which] != npts) |
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76 { |
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77 create_new_plan = true; |
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78 n[which] = npts; |
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79 } |
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80 |
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81 if (create_new_plan) |
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82 { |
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83 if (*cur_plan_p) |
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84 fftw_destroy_plan (*cur_plan_p); |
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85 |
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86 *cur_plan_p = fftw_create_plan (npts, dir, plan_flags); |
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87 |
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88 if (*cur_plan_p == 0) |
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89 (*current_liboctave_error_handler) ("Error creating fftw plan"); |
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90 } |
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91 |
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92 return *cur_plan_p; |
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93 } |
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94 |
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95 fftwnd_plan |
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96 octave_fftw_planner::create_plan2d (fftw_direction dir, |
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97 size_t nrows, size_t ncols) |
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98 { |
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99 size_t which = (dir == FFTW_FORWARD) ? 0 : 1; |
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100 fftwnd_plan *cur_plan_p = &plan2d[which]; |
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101 bool create_new_plan = false; |
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102 |
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103 if (plan2d[which] == 0 || n2d[which][0] != nrows || n2d[which][1] != ncols) |
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104 { |
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105 create_new_plan = true; |
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106 |
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107 n2d[which][0] = nrows; |
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108 n2d[which][1] = ncols; |
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109 } |
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110 |
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111 if (create_new_plan) |
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112 { |
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113 if (*cur_plan_p) |
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114 fftwnd_destroy_plan (*cur_plan_p); |
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115 |
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116 *cur_plan_p = fftw2d_create_plan (nrows, ncols, dir, |
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117 plan_flags | FFTW_IN_PLACE); |
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118 |
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119 if (*cur_plan_p == 0) |
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120 (*current_liboctave_error_handler) ("Error creating 2d fftw plan"); |
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121 } |
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122 |
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123 return *cur_plan_p; |
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124 } |
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125 |
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126 static octave_fftw_planner fftw_planner; |
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127 |
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128 int |
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129 octave_fftw::fft (const Complex *in, Complex *out, size_t npts) |
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130 { |
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131 fftw_one (fftw_planner.create_plan (FFTW_FORWARD, npts), |
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132 reinterpret_cast<fftw_complex *> (const_cast<Complex *> (in)), |
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133 reinterpret_cast<fftw_complex *> (out)); |
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134 |
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135 return 0; |
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136 } |
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137 |
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138 int |
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139 octave_fftw::ifft (const Complex *in, Complex *out, size_t npts) |
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140 { |
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141 fftw_one (fftw_planner.create_plan (FFTW_BACKWARD, npts), |
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142 reinterpret_cast<fftw_complex *> (const_cast<Complex *> (in)), |
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143 reinterpret_cast<fftw_complex *> (out)); |
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144 |
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145 const Complex scale = npts; |
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146 for (size_t i = 0; i < npts; i++) |
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147 out[i] /= scale; |
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148 |
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149 return 0; |
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150 } |
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151 |
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152 int |
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153 octave_fftw::fft2d (Complex *inout, size_t nr, size_t nc) |
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154 { |
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155 fftwnd_one (fftw_planner.create_plan2d (FFTW_FORWARD, nr, nc), |
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156 reinterpret_cast<fftw_complex *> (inout), |
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157 0); |
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158 |
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159 return 0; |
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160 } |
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161 |
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162 int |
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163 octave_fftw::ifft2d (Complex *inout, size_t nr, size_t nc) |
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164 { |
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165 fftwnd_one (fftw_planner.create_plan2d (FFTW_BACKWARD, nr, nc), |
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166 reinterpret_cast<fftw_complex *> (inout), |
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167 0); |
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168 |
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169 const size_t npts = nr * nc; |
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170 const Complex scale = npts; |
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171 for (size_t i = 0; i < npts; i++) |
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172 inout[i] /= scale; |
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173 |
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174 return 0; |
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175 } |
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176 |
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177 #endif |
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178 |
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179 /* |
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180 ;;; Local Variables: *** |
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181 ;;; mode: C++ *** |
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182 ;;; End: *** |
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183 */ |
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184 |
