1 | /* |
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2 | Copyright (C) 2003-2009 Paul Brossier <piem@aubio.org> |
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3 | |
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4 | This file is part of aubio. |
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5 | |
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6 | aubio is free software: you can redistribute it and/or modify |
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7 | it under the terms of the GNU General Public License as published by |
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8 | the Free Software Foundation, either version 3 of the License, or |
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9 | (at your option) any later version. |
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10 | |
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11 | aubio is distributed in the hope that it will be useful, |
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | GNU General Public License for more details. |
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15 | |
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16 | You should have received a copy of the GNU General Public License |
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17 | along with aubio. If not, see <http://www.gnu.org/licenses/>. |
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18 | |
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19 | */ |
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20 | |
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21 | #ifndef _CVEC_H |
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22 | #define _CVEC_H |
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23 | |
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24 | #ifdef __cplusplus |
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25 | extern "C" { |
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26 | #endif |
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27 | |
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28 | /** \file |
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29 | |
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30 | Vector of complex-valued data |
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31 | |
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32 | This file specifies the ::cvec_t buffer type, which is used throughout aubio |
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33 | to store complex data. Complex values are stored in terms of ::cvec_t.phas |
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34 | and norm, within size/2+1 long vectors of ::smpl_t. |
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35 | |
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36 | \example test-cvec.c |
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37 | |
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38 | */ |
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39 | |
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40 | /** Buffer for complex data |
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41 | |
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42 | \code |
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43 | |
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44 | uint_t buffer_size = 1024; |
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45 | |
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46 | // create a complex vector of 512 values |
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47 | cvec_t * input = new_cvec (buffer_size); |
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48 | |
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49 | // set some values of the vector |
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50 | input->norm[23] = 2.; |
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51 | input->phas[23] = M_PI; |
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52 | // .. |
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53 | |
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54 | // compute the mean of the vector |
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55 | mean = cvec_mean(input); |
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56 | |
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57 | // destroy the vector |
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58 | del_cvec (input); |
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59 | |
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60 | \endcode |
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61 | |
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62 | */ |
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63 | typedef struct { |
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64 | uint_t length; /**< length of buffer = (requested length)/2 + 1 */ |
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65 | smpl_t *norm; /**< norm array of size ::cvec_t.length */ |
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66 | smpl_t *phas; /**< phase array of size ::cvec_t.length */ |
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67 | } cvec_t; |
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68 | |
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69 | /** cvec_t buffer creation function |
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70 | |
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71 | This function creates a cvec_t structure holding two arrays of size |
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72 | [length/2+1], corresponding to the norm and phase values of the |
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73 | spectral frame. The length stored in the structure is the actual size of both |
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74 | arrays, not the length of the complex and symmetrical vector, specified as |
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75 | creation argument. |
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76 | |
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77 | \param length the length of the buffer to create |
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78 | |
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79 | */ |
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80 | cvec_t * new_cvec(uint_t length); |
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81 | /** cvec_t buffer deletion function |
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82 | |
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83 | \param s buffer to delete as returned by new_cvec() |
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84 | |
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85 | */ |
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86 | void del_cvec(cvec_t *s); |
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87 | /** write norm value in a complex buffer |
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88 | |
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89 | Note that this function is not used in the aubio library, since the same |
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90 | result can be obtained by assigning vec->norm[position]. Its purpose |
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91 | is to access these values from wrappers, as created by swig. |
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92 | |
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93 | \param s vector to write to |
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94 | \param data norm value to write in s->norm[position] |
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95 | \param position sample position to write to |
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96 | |
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97 | */ |
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98 | void cvec_write_norm(cvec_t *s, smpl_t data, uint_t position); |
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99 | /** write phase value in a complex buffer |
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100 | |
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101 | Note that this function is not used in the aubio library, since the same |
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102 | result can be obtained by assigning vec->phas[position]. Its purpose |
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103 | is to access these values from wrappers, as created by swig. |
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104 | |
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105 | \param s vector to write to |
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106 | \param data phase value to write in s->phas[position] |
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107 | \param position sample position to write to |
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108 | |
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109 | */ |
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110 | void cvec_write_phas(cvec_t *s, smpl_t data, uint_t position); |
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111 | /** read norm value from a complex buffer |
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112 | |
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113 | Note that this function is not used in the aubio library, since the same |
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114 | result can be obtained with vec->norm[position]. Its purpose is to |
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115 | access these values from wrappers, as created by swig. |
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116 | |
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117 | \param s vector to read from |
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118 | \param position sample position to read from |
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119 | |
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120 | */ |
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121 | smpl_t cvec_read_norm(cvec_t *s, uint_t position); |
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122 | /** read phase value from a complex buffer |
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123 | |
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124 | Note that this function is not used in the aubio library, since the same |
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125 | result can be obtained with vec->phas[position]. Its purpose is to |
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126 | access these values from wrappers, as created by swig. |
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127 | |
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128 | \param s vector to read from |
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129 | \param position sample position to read from |
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130 | |
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131 | */ |
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132 | smpl_t cvec_read_phas(cvec_t *s, uint_t position); |
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133 | /** read norm data from a complex buffer |
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134 | |
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135 | Note that this function is not used in the aubio library, since the same |
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136 | result can be obtained with vec->norm. Its purpose is to access these values |
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137 | from wrappers, as created by swig. |
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138 | |
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139 | \param s vector to read from |
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140 | |
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141 | */ |
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142 | smpl_t * cvec_get_norm(cvec_t *s); |
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143 | /** read phase data from a complex buffer |
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144 | |
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145 | Note that this function is not used in the aubio library, since the same |
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146 | result can be obtained with vec->phas. Its purpose is to access these values |
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147 | from wrappers, as created by swig. |
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148 | |
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149 | \param s vector to read from |
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150 | |
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151 | */ |
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152 | smpl_t * cvec_get_phas(cvec_t *s); |
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153 | |
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154 | /** print out cvec data |
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155 | |
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156 | \param s vector to print out |
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157 | |
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158 | */ |
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159 | void cvec_print(cvec_t *s); |
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160 | |
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161 | /** set all elements to a given value |
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162 | |
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163 | \param s vector to modify |
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164 | \param val value to set elements to |
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165 | |
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166 | */ |
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167 | void cvec_set(cvec_t *s, smpl_t val); |
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168 | |
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169 | /** set all elements to zero |
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170 | |
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171 | \param s vector to modify |
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172 | |
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173 | */ |
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174 | void cvec_zeros(cvec_t *s); |
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175 | |
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176 | /** set all elements to ones |
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177 | |
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178 | \param s vector to modify |
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179 | |
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180 | */ |
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181 | void cvec_ones(cvec_t *s); |
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182 | |
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183 | #ifdef __cplusplus |
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184 | } |
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185 | #endif |
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186 | |
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187 | #endif /* _CVEC_H */ |
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188 | |
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