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<a href="musicutils_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> Copyright (C) 2003-2013 Paul Brossier <piem@aubio.org></span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"></span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> This file is part of aubio.</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"></span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> aubio is free software: you can redistribute it and/or modify</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> it under the terms of the GNU General Public License as published by</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> the Free Software Foundation, either version 3 of the License, or</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> (at your option) any later version.</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"></span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> aubio is distributed in the hope that it will be useful,</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> GNU General Public License for more details.</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"></span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> You should have received a copy of the GNU General Public License</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> along with aubio. If not, see <http://www.gnu.org/licenses/>.</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"></span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment">*/</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"></span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment">/** @file</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> * various functions useful in audio signal processing</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> */</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#ifndef _AUBIO__MUSICUTILS_H</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#define _AUBIO__MUSICUTILS_H</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#ifdef __cplusplus</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="keyword">extern</span> <span class="stringliteral">"C"</span> {</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"></span></div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment">/** create window </span></div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"></span></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> \param window_type type of the window to create</span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> \param size length of the window to create (see fvec_set_window())</span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> </span></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment">*/</span></div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <a class="code" href="structfvec__t.html">fvec_t</a> *<a class="code" href="musicutils_8h.html#a2de17a3340d23911350f511e9ac2c63c">new_aubio_window</a> (<a class="code" href="types_8h.html#a40bb5262bf908c328fbcfbe5d29d0201">char_t</a> * window_type, <a class="code" href="types_8h.html#a12a1e9b3ce141648783a82445d02b58d">uint_t</a> size);</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"></span></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment">/** set elements of a vector to window coefficients</span></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"></span></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> \param window exsting ::fvec_t to use</span></div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"> \param window_type type of the window to create</span></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment"></span></div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"> List of available window types: "rectangle", "hamming", "hanning",</span></div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"> "hanningz", "blackman", "blackman_harris", "gaussian", "welch", "parzen",</span></div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment"> "default".</span></div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment"></span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"> "default" is equivalent to "hanningz".</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"></span></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"> References:</span></div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment"> </span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment"> - <a href="http://en.wikipedia.org/wiki/Window_function">Window</span></div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment">function</a> on Wikipedia</span></div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="comment"> - Amalia de Götzen, Nicolas Bernardini, and Daniel Arfib. Traditional (?)</span></div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment">implementations of a phase vocoder: the tricks of the trade. In Proceedings of</span></div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment">the International Conference on Digital Audio Effects (DAFx-00), pages 37–44,</span></div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment">Uni- versity of Verona, Italy, 2000.</span></div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment"> (<a href="http://profs.sci.univr.it/%7Edafx/Final-Papers/ps/Bernardini.ps.gz"></span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment"> ps.gz</a>)</span></div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"></span></div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment"> */</span></div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <a class="code" href="types_8h.html#a12a1e9b3ce141648783a82445d02b58d">uint_t</a> <a class="code" href="musicutils_8h.html#a55c9b59b050c70c0c70ecee1ee2c23dd">fvec_set_window</a> (<a class="code" href="structfvec__t.html">fvec_t</a> * window, <a class="code" href="types_8h.html#a40bb5262bf908c328fbcfbe5d29d0201">char_t</a> * window_type);</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment"></span></div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment">/** compute the principal argument</span></div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment"></span></div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment"> This function maps the input phase to its corresponding value wrapped in the</span></div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment">range \f$ [-\pi, \pi] \f$.</span></div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment"></span></div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment"> \param phase unwrapped phase to map to the unit circle</span></div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment"> </span></div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment"> \return equivalent phase wrapped to the unit circle</span></div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment"></span></div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment">*/</span></div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> <a class="code" href="musicutils_8h.html#adc254da5d4e7a8674bc4830bc6f0554b">aubio_unwrap2pi</a> (<a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> phase);</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment"></span></div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment">/** convert frequency bin to midi value */</span></div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> <a class="code" href="musicutils_8h.html#aa73e67530bdc66bfa08ee4f08e48c3fc">aubio_bintomidi</a> (<a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> bin, <a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> samplerate, <a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> fftsize);</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment"></span></div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment">/** convert midi value to frequency bin */</span></div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> <a class="code" href="musicutils_8h.html#a4ca9575b66357f1e75e4ead52f73f720">aubio_miditobin</a> (<a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> midi, <a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> samplerate, <a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> fftsize);</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment"></span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment">/** convert frequency bin to frequency (Hz) */</span></div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> <a class="code" href="musicutils_8h.html#a08cbeb1881cd3d9adba9e8606bb3f089">aubio_bintofreq</a> (<a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> bin, <a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> samplerate, <a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> fftsize);</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment"></span></div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment">/** convert frequency (Hz) to frequency bin */</span></div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> <a class="code" href="musicutils_8h.html#af3a7e117c7c2e06ce8defa90f1d8e170">aubio_freqtobin</a> (<a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> freq, <a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> samplerate, <a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> fftsize);</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="comment"></span></div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="comment">/** convert frequency (Hz) to midi value (0-128) */</span></div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> <a class="code" href="musicutils_8h.html#a26df6f267c73981029ced924c0572f82">aubio_freqtomidi</a> (<a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> freq);</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment"></span></div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment">/** convert midi value (0-128) to frequency (Hz) */</span></div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> <a class="code" href="musicutils_8h.html#ae1417d0e88f401df87538182bfb9272f">aubio_miditofreq</a> (<a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> midi);</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="comment"></span></div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="comment">/** clean up cached memory at the end of program</span></div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="comment"> </span></div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment"> This function should be used at the end of programs to purge all cached</span></div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="comment"> memory. So far it is only useful to clean FFTW's cache.</span></div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="comment"></span></div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="comment">*/</span></div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="keywordtype">void</span> <a class="code" href="musicutils_8h.html#a2b5d813f8d70b69add6f4811a68c9424">aubio_cleanup</a> (<span class="keywordtype">void</span>);</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="comment"></span></div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment">/** zero-crossing rate (ZCR)</span></div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment"></span></div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment"> The zero-crossing rate is the number of times a signal changes sign,</span></div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="comment"> divided by the length of this signal.</span></div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="comment"></span></div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="comment"> \param v vector to compute ZCR from</span></div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span> <span class="comment"></span></div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span> <span class="comment"> \return zero-crossing rate of v</span></div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="comment"></span></div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span> <span class="comment">*/</span></div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span> <a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> <a class="code" href="musicutils_8h.html#afb1233f499a7df24e4621e47f93454bc">aubio_zero_crossing_rate</a> (<a class="code" href="structfvec__t.html">fvec_t</a> * v);</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="comment"></span></div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="comment">/** compute sound level on a linear</span></div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="comment"></span></div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="comment"> This gives the average of the square amplitudes.</span></div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="comment"></span></div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="comment"> \param v vector to compute dB SPL from</span></div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="comment"></span></div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="comment"> \return level of v</span></div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span> <span class="comment"></span></div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="comment">*/</span></div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> <a class="code" href="musicutils_8h.html#a73f016353e3b67941d9d83938d7119de">aubio_level_lin</a> (<a class="code" href="structfvec__t.html">fvec_t</a> * v);</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span> <span class="comment"></span></div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="comment">/** compute sound pressure level (SPL) in dB</span></div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span> <span class="comment"></span></div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span> <span class="comment"> This quantity is often wrongly called 'loudness'.</span></div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="comment"></span></div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="comment"> This gives ten times the log10 of the average of the square amplitudes.</span></div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span> <span class="comment"></span></div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="comment"> \param v vector to compute dB SPL from</span></div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="comment"></span></div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span> <span class="comment"> \return level of v in dB SPL</span></div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="comment"></span></div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span> <span class="comment">*/</span></div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> <a class="code" href="musicutils_8h.html#aa84b2c82553c094f4d520fa7c4e265fb">aubio_db_spl</a> (<a class="code" href="structfvec__t.html">fvec_t</a> * v);</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="comment"></span></div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="comment">/** check if buffer level in dB SPL is under a given threshold</span></div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="comment"> </span></div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span> <span class="comment"> \param v vector to get level from</span></div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span> <span class="comment"> \param threshold threshold in dB SPL</span></div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="comment"></span></div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span> <span class="comment"> \return 0 if level is under the given threshold, 1 otherwise</span></div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="comment"></span></div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span> <span class="comment">*/</span></div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <a class="code" href="types_8h.html#a12a1e9b3ce141648783a82445d02b58d">uint_t</a> <a class="code" href="musicutils_8h.html#a4277e50cf32d171f0efb84ed01a17dc0">aubio_silence_detection</a> (<a class="code" href="structfvec__t.html">fvec_t</a> * v, <a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> threshold);</div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span> <span class="comment"></span></div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span> <span class="comment">/** get buffer level if level >= threshold, 1. otherwise</span></div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span> <span class="comment"></span></div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="comment"> \param v vector to get level from</span></div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="comment"> \param threshold threshold in dB SPL</span></div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span> <span class="comment"></span></div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span> <span class="comment"> \return level in dB SPL if level >= threshold, 1. otherwise</span></div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span> <span class="comment"></span></div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span> <span class="comment">*/</span></div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span> <a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> <a class="code" href="musicutils_8h.html#a6fbd8fb35d0547fcbba8c3a058c5b0cd">aubio_level_detection</a> (<a class="code" href="structfvec__t.html">fvec_t</a> * v, <a class="code" href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a> threshold);</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span> </div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span> <span class="preprocessor">#ifdef __cplusplus</span></div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span> }</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span> </div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span> <span class="preprocessor">#endif </span><span class="comment">/* _AUBIO__MUSICUTILS_H */</span><span class="preprocessor"></span></div><div class="ttc" id="musicutils_8h_html_a08cbeb1881cd3d9adba9e8606bb3f089"><div class="ttname"><a href="musicutils_8h.html#a08cbeb1881cd3d9adba9e8606bb3f089">aubio_bintofreq</a></div><div class="ttdeci">smpl_t aubio_bintofreq(smpl_t bin, smpl_t samplerate, smpl_t fftsize)</div><div class="ttdoc">convert frequency bin to frequency (Hz) </div></div>
<div class="ttc" id="musicutils_8h_html_aa73e67530bdc66bfa08ee4f08e48c3fc"><div class="ttname"><a href="musicutils_8h.html#aa73e67530bdc66bfa08ee4f08e48c3fc">aubio_bintomidi</a></div><div class="ttdeci">smpl_t aubio_bintomidi(smpl_t bin, smpl_t samplerate, smpl_t fftsize)</div><div class="ttdoc">convert frequency bin to midi value </div></div>
<div class="ttc" id="musicutils_8h_html_adc254da5d4e7a8674bc4830bc6f0554b"><div class="ttname"><a href="musicutils_8h.html#adc254da5d4e7a8674bc4830bc6f0554b">aubio_unwrap2pi</a></div><div class="ttdeci">smpl_t aubio_unwrap2pi(smpl_t phase)</div><div class="ttdoc">compute the principal argument </div></div>
<div class="ttc" id="musicutils_8h_html_a2b5d813f8d70b69add6f4811a68c9424"><div class="ttname"><a href="musicutils_8h.html#a2b5d813f8d70b69add6f4811a68c9424">aubio_cleanup</a></div><div class="ttdeci">void aubio_cleanup(void)</div><div class="ttdoc">clean up cached memory at the end of program </div></div>
<div class="ttc" id="musicutils_8h_html_af3a7e117c7c2e06ce8defa90f1d8e170"><div class="ttname"><a href="musicutils_8h.html#af3a7e117c7c2e06ce8defa90f1d8e170">aubio_freqtobin</a></div><div class="ttdeci">smpl_t aubio_freqtobin(smpl_t freq, smpl_t samplerate, smpl_t fftsize)</div><div class="ttdoc">convert frequency (Hz) to frequency bin </div></div>
<div class="ttc" id="types_8h_html_a5d7119468d78a1dc35cf76d0adfb1436"><div class="ttname"><a href="types_8h.html#a5d7119468d78a1dc35cf76d0adfb1436">smpl_t</a></div><div class="ttdeci">float smpl_t</div><div class="ttdoc">short sample format (32 or 64 bits) </div><div class="ttdef"><b>Definition:</b> <a href="types_8h_source.html#l00041">types.h:41</a></div></div>
<div class="ttc" id="musicutils_8h_html_ae1417d0e88f401df87538182bfb9272f"><div class="ttname"><a href="musicutils_8h.html#ae1417d0e88f401df87538182bfb9272f">aubio_miditofreq</a></div><div class="ttdeci">smpl_t aubio_miditofreq(smpl_t midi)</div><div class="ttdoc">convert midi value (0-128) to frequency (Hz) </div></div>
<div class="ttc" id="musicutils_8h_html_a26df6f267c73981029ced924c0572f82"><div class="ttname"><a href="musicutils_8h.html#a26df6f267c73981029ced924c0572f82">aubio_freqtomidi</a></div><div class="ttdeci">smpl_t aubio_freqtomidi(smpl_t freq)</div><div class="ttdoc">convert frequency (Hz) to midi value (0-128) </div></div>
<div class="ttc" id="musicutils_8h_html_a55c9b59b050c70c0c70ecee1ee2c23dd"><div class="ttname"><a href="musicutils_8h.html#a55c9b59b050c70c0c70ecee1ee2c23dd">fvec_set_window</a></div><div class="ttdeci">uint_t fvec_set_window(fvec_t *window, char_t *window_type)</div><div class="ttdoc">set elements of a vector to window coefficients </div></div>
<div class="ttc" id="musicutils_8h_html_a4ca9575b66357f1e75e4ead52f73f720"><div class="ttname"><a href="musicutils_8h.html#a4ca9575b66357f1e75e4ead52f73f720">aubio_miditobin</a></div><div class="ttdeci">smpl_t aubio_miditobin(smpl_t midi, smpl_t samplerate, smpl_t fftsize)</div><div class="ttdoc">convert midi value to frequency bin </div></div>
<div class="ttc" id="musicutils_8h_html_a6fbd8fb35d0547fcbba8c3a058c5b0cd"><div class="ttname"><a href="musicutils_8h.html#a6fbd8fb35d0547fcbba8c3a058c5b0cd">aubio_level_detection</a></div><div class="ttdeci">smpl_t aubio_level_detection(fvec_t *v, smpl_t threshold)</div><div class="ttdoc">get buffer level if level >= threshold, 1. </div></div>
<div class="ttc" id="structfvec__t_html"><div class="ttname"><a href="structfvec__t.html">fvec_t</a></div><div class="ttdoc">Buffer for real data. </div><div class="ttdef"><b>Definition:</b> <a href="fvec_8h_source.html#l00067">fvec.h:67</a></div></div>
<div class="ttc" id="musicutils_8h_html_a73f016353e3b67941d9d83938d7119de"><div class="ttname"><a href="musicutils_8h.html#a73f016353e3b67941d9d83938d7119de">aubio_level_lin</a></div><div class="ttdeci">smpl_t aubio_level_lin(fvec_t *v)</div><div class="ttdoc">compute sound level on a linear </div></div>
<div class="ttc" id="musicutils_8h_html_a2de17a3340d23911350f511e9ac2c63c"><div class="ttname"><a href="musicutils_8h.html#a2de17a3340d23911350f511e9ac2c63c">new_aubio_window</a></div><div class="ttdeci">fvec_t * new_aubio_window(char_t *window_type, uint_t size)</div><div class="ttdoc">create window </div></div>
<div class="ttc" id="types_8h_html_a12a1e9b3ce141648783a82445d02b58d"><div class="ttname"><a href="types_8h.html#a12a1e9b3ce141648783a82445d02b58d">uint_t</a></div><div class="ttdeci">unsigned int uint_t</div><div class="ttdoc">unsigned integer </div><div class="ttdef"><b>Definition:</b> <a href="types_8h_source.html#l00060">types.h:60</a></div></div>
<div class="ttc" id="musicutils_8h_html_afb1233f499a7df24e4621e47f93454bc"><div class="ttname"><a href="musicutils_8h.html#afb1233f499a7df24e4621e47f93454bc">aubio_zero_crossing_rate</a></div><div class="ttdeci">smpl_t aubio_zero_crossing_rate(fvec_t *v)</div><div class="ttdoc">zero-crossing rate (ZCR) </div></div>
<div class="ttc" id="types_8h_html_a40bb5262bf908c328fbcfbe5d29d0201"><div class="ttname"><a href="types_8h.html#a40bb5262bf908c328fbcfbe5d29d0201">char_t</a></div><div class="ttdeci">char char_t</div><div class="ttdoc">character </div><div class="ttdef"><b>Definition:</b> <a href="types_8h_source.html#l00064">types.h:64</a></div></div>
<div class="ttc" id="musicutils_8h_html_aa84b2c82553c094f4d520fa7c4e265fb"><div class="ttname"><a href="musicutils_8h.html#aa84b2c82553c094f4d520fa7c4e265fb">aubio_db_spl</a></div><div class="ttdeci">smpl_t aubio_db_spl(fvec_t *v)</div><div class="ttdoc">compute sound pressure level (SPL) in dB </div></div>
<div class="ttc" id="musicutils_8h_html_a4277e50cf32d171f0efb84ed01a17dc0"><div class="ttname"><a href="musicutils_8h.html#a4277e50cf32d171f0efb84ed01a17dc0">aubio_silence_detection</a></div><div class="ttdeci">uint_t aubio_silence_detection(fvec_t *v, smpl_t threshold)</div><div class="ttdoc">check if buffer level in dB SPL is under a given threshold </div></div>
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