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<div class="title">fe_sigproc.c</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">/* ====================================================================</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * Copyright (c) 1996-2004 Carnegie Mellon University. All rights </span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * reserved.</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"> * Redistribution and use in source and binary forms, with or without</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * modification, are permitted provided that the following conditions</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * are met:</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> * 1. Redistributions of source code must retain the above copyright</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * notice, this list of conditions and the following disclaimer. </span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * notice, this list of conditions and the following disclaimer in</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * the documentation and/or other materials provided with the</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * distribution.</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * This work was supported in part by funding from the Defense Advanced </span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * Research Projects Agency and the National Science Foundation of the </span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * United States of America, and the CMU Sphinx Speech Consortium.</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND </span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, </span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT </span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, </span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY </span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT </span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE </span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</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"> * ====================================================================</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> *</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> </div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="preprocessor">#include <stdio.h></span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="preprocessor">#include <math.h></span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="preprocessor">#include <string.h></span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="preprocessor">#include <stdlib.h></span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="preprocessor">#include <assert.h></span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="preprocessor">#ifdef HAVE_CONFIG_H</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="preprocessor">#include <config.h></span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="preprocessor">#ifdef _MSC_VER</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="preprocessor">#pragma warning (disable: 4244)</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="preprocessor">#ifndef M_PI</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="preprocessor">#define M_PI 3.14159265358979323846 </span><span class="comment">/* pi */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="preprocessor">#endif // M_PI</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> </div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="preprocessor">#include "<a class="code" href="prim__type_8h.html">sphinxbase/prim_type.h</a>"</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="preprocessor">#include "<a class="code" href="ckd__alloc_8h.html">sphinxbase/ckd_alloc.h</a>"</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="preprocessor">#include "sphinxbase/byteorder.h"</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="preprocessor">#include "sphinxbase/fixpoint.h"</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="preprocessor">#include "sphinxbase/fe.h"</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="preprocessor">#include "<a class="code" href="genrand_8h.html">sphinxbase/genrand.h</a>"</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="preprocessor">#include "<a class="code" href="err_8h.html">sphinxbase/err.h</a>"</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> </div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="preprocessor">#include "fe_internal.h"</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="preprocessor">#include "fe_warp.h"</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment">/* Use extra precision for cosines, Hamming window, pre-emphasis</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment"> * coefficient, twiddle factors. */</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="preprocessor">#ifdef FIXED_POINT</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="preprocessor">#define FLOAT2COS(x) FLOAT2FIX_ANY(x,30)</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="preprocessor">#define COSMUL(x,y) FIXMUL_ANY(x,y,30)</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="preprocessor">#define FLOAT2COS(x) (x)</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="preprocessor">#define COSMUL(x,y) ((x)*(y))</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> </div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="preprocessor">#ifdef FIXED_POINT</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment">/* Internal log-addition table for natural log with radix point at 8</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment"> * bits. Each entry is 256 * log(1 + e^{-n/256}). This is used in the</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment"> * log-add computation:</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment"> * e^z = e^x + e^y</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment"> * e^z = e^x(1 + e^{y-x}) = e^y(1 + e^{x-y})</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="comment"> * z = x + log(1 + e^{y-x}) = y + log(1 + e^{x-y})</span></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"> * So when y > x, z = y + logadd_table[-(x-y)]</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="comment"> * when x > y, z = x + logadd_table[-(y-x)]</span></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="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> fe_logadd_table[] = {</div>
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<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> 28, 28, 28, 28, 28, 28, 28, 28, 27, 27,</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span> 27, 27, 27, 27, 27, 27, 27, 27, 26, 26,</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> 26, 26, 26, 26, 26, 26, 26, 26, 25, 25,</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> 25, 25, 25, 25, 25, 25, 25, 25, 25, 24,</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span> 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> 23, 23, 22, 22, 22, 22, 22, 22, 22, 22,</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> 22, 22, 22, 22, 21, 21, 21, 21, 21, 21,</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> 21, 21, 21, 21, 21, 21, 21, 20, 20, 20,</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> 19, 19, 19, 19, 19, 19, 19, 19, 19, 19,</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> 19, 19, 19, 19, 18, 18, 18, 18, 18, 18,</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span> 18, 18, 18, 18, 18, 18, 18, 18, 18, 17,</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span> 17, 17, 17, 17, 17, 17, 17, 17, 17, 17,</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span> 17, 17, 17, 17, 16, 16, 16, 16, 16, 16,</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span> 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> 16, 15, 15, 15, 15, 15, 15, 15, 15, 15,</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span> 15, 15, 15, 15, 15, 15, 15, 15, 14, 14,</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span> 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span> 14, 14, 14, 14, 14, 14, 14, 13, 13, 13,</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span> 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span> 13, 13, 13, 13, 13, 13, 13, 12, 12, 12,</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span> 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span> 12, 12, 12, 12, 12, 12, 12, 12, 12, 11,</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span> 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span> 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> 11, 11, 11, 10, 10, 10, 10, 10, 10, 10,</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span> 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span> 10, 10, 10, 10, 10, 10, 10, 10, 10, 9,</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span> 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span> 9, 9, 9, 9, 9, 9, 9, 9, 8, 8,</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span> 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span> 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span> 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span> 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span> 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span> 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span> 7, 7, 7, 7, 7, 7, 7, 7, 6, 6,</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span> 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span> 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span> 6, 5, 5, 5, 5, 5, 5, 5, 5, 5,</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span> 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span> 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span> 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,</div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> 5, 5, 5, 4, 4, 4, 4, 4, 4, 4,</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span> 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,</div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span> 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,</div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span> 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span> 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span> 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span> 4, 4, 4, 4, 4, 4, 4, 4, 3, 3,</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span> 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span> 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span> 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span> 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span> 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span> 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span> 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span> 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,</div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span> 3, 3, 3, 3, 2, 2, 2, 2, 2, 2,</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span> 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span> 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span> 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,</div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span> 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,</div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span> 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span> 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span> 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,</div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span> 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,</div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span> 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,</div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span> 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,</div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span> 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,</div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span> 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,</div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span> 2, 2, 2, 2, 2, 2, 1, 1, 1, 1,</div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span> 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,</div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span> 1, 1, 1, 1, 1, 1, 1, 0</div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span> };</div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> fe_logadd_table_size = <span class="keyword">sizeof</span>(fe_logadd_table) / <span class="keyword">sizeof</span>(fe_logadd_table[0]);</div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span> </div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span> <span class="keyword">static</span> fixed32</div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span> fe_log_add(fixed32 x, fixed32 y)</div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span> {</div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  fixed32 d, r;</div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span> </div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  <span class="keywordflow">if</span> (x > y) {</div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  d = (x - y) >> (DEFAULT_RADIX - 8);</div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  r = x;</div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  }</div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  d = (y - x) >> (DEFAULT_RADIX - 8);</div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  r = y;</div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  }</div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  <span class="keywordflow">if</span> (d > fe_logadd_table_size - 1)</div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  <span class="keywordflow">return</span> r;</div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  r += ((fixed32)fe_logadd_table[d] << (DEFAULT_RADIX - 8));</div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span> <span class="comment"> printf("%d + %d = %d | %f + %f = %f | %f + %f = %f\n",</span></div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span> <span class="comment"> x, y, r, FIX2FLOAT(x), FIX2FLOAT(y), FIX2FLOAT(r),</span></div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span> <span class="comment"> exp(FIX2FLOAT(x)), exp(FIX2FLOAT(y)), exp(FIX2FLOAT(r)));</span></div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span> <span class="comment">*/</span></div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  <span class="keywordflow">return</span> r;</div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  }</div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span> }</div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span> </div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span> <span class="keyword">static</span> fixed32</div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span> fe_log(float32 x)</div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span> {</div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  <span class="keywordflow">if</span> (x <= 0) {</div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  <span class="keywordflow">return</span> MIN_FIXLOG;</div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  }</div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  <span class="keywordflow">return</span> FLOAT2FIX(log(x));</div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  }</div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span> }</div>
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span> </div>
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span> <span class="keyword">static</span> float32</div>
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span> fe_mel(<a class="code" href="structmelfb__s.html">melfb_t</a> *mel, float32 x)</div>
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span> {</div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  float32 warped = fe_warp_unwarped_to_warped(mel, x);</div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span> </div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  <span class="keywordflow">return</span> (float32) (2595.0 * log10(1.0 + warped / 700.0));</div>
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span> }</div>
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span> </div>
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span> <span class="keyword">static</span> float32</div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span> fe_melinv(<a class="code" href="structmelfb__s.html">melfb_t</a> *mel, float32 x)</div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span> {</div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  float32 warped = (float32) (700.0 * (pow(10.0, x / 2595.0) - 1.0));</div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  <span class="keywordflow">return</span> fe_warp_warped_to_unwarped(mel, warped);</div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span> }</div>
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span> </div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span> int32</div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span> fe_build_melfilters(<a class="code" href="structmelfb__s.html">melfb_t</a> *mel_fb)</div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span> {</div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  float32 melmin, melmax, melbw, fftfreq;</div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  <span class="keywordtype">int</span> n_coeffs, i, j;</div>
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span> </div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  <span class="comment">/* Filter coefficient matrix, in flattened form. */</span></div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  mel_fb->spec_start = <a class="code" href="ckd__alloc_8h.html#a8e89a31c3c70710a8e023a177084bff2">ckd_malloc</a>(mel_fb->num_filters * <span class="keyword">sizeof</span>(*mel_fb->spec_start));</div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  mel_fb->filt_start = <a class="code" href="ckd__alloc_8h.html#a8e89a31c3c70710a8e023a177084bff2">ckd_malloc</a>(mel_fb->num_filters * <span class="keyword">sizeof</span>(*mel_fb->filt_start));</div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  mel_fb->filt_width = <a class="code" href="ckd__alloc_8h.html#a8e89a31c3c70710a8e023a177084bff2">ckd_malloc</a>(mel_fb->num_filters * <span class="keyword">sizeof</span>(*mel_fb->filt_width));</div>
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span> </div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  <span class="comment">/* First calculate the widths of each filter. */</span></div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  <span class="comment">/* Minimum and maximum frequencies in mel scale. */</span></div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  melmin = fe_mel(mel_fb, mel_fb->lower_filt_freq);</div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  melmax = fe_mel(mel_fb, mel_fb->upper_filt_freq);</div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span> </div>
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  <span class="comment">/* Width of filters in mel scale */</span></div>
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  melbw = (melmax - melmin) / (mel_fb->num_filters + 1);</div>
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  <span class="keywordflow">if</span> (mel_fb->doublewide) {</div>
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  melmin -= melbw;</div>
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  melmax += melbw;</div>
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span>  <span class="keywordflow">if</span> ((fe_melinv(mel_fb, melmin) < 0) ||</div>
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  (fe_melinv(mel_fb, melmax) > mel_fb->sampling_rate / 2)) {</div>
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span>  <a class="code" href="err_8h.html#a6a794bec721b555ac1f2167f9e12f662">E_WARN</a></div>
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  (<span class="stringliteral">"Out of Range: low filter edge = %f (%f)\n"</span>,</div>
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  fe_melinv(mel_fb, melmin), 0.0);</div>
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span>  <a class="code" href="err_8h.html#a6a794bec721b555ac1f2167f9e12f662">E_WARN</a></div>
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  (<span class="stringliteral">" high filter edge = %f (%f)\n"</span>,</div>
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  fe_melinv(mel_fb, melmax), mel_fb->sampling_rate / 2);</div>
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span>  <span class="keywordflow">return</span> FE_INVALID_PARAM_ERROR;</div>
<div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  }</div>
<div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  }</div>
<div class="line"><a name="l00341"></a><span class="lineno"> 341</span> </div>
<div class="line"><a name="l00342"></a><span class="lineno"> 342</span>  <span class="comment">/* DFT point spacing */</span></div>
<div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  fftfreq = mel_fb->sampling_rate / (float32) mel_fb->fft_size;</div>
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span> </div>
<div class="line"><a name="l00345"></a><span class="lineno"> 345</span>  <span class="comment">/* Count and place filter coefficients. */</span></div>
<div class="line"><a name="l00346"></a><span class="lineno"> 346</span>  n_coeffs = 0;</div>
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span>  for (i = 0; i < mel_fb->num_filters; ++i) {</div>
<div class="line"><a name="l00348"></a><span class="lineno"> 348</span>  float32 freqs[3];</div>
<div class="line"><a name="l00349"></a><span class="lineno"> 349</span> </div>
<div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  <span class="comment">/* Left, center, right frequencies in Hertz */</span></div>
<div class="line"><a name="l00351"></a><span class="lineno"> 351</span>  <span class="keywordflow">for</span> (j = 0; j < 3; ++j) {</div>
<div class="line"><a name="l00352"></a><span class="lineno"> 352</span>  <span class="keywordflow">if</span> (mel_fb->doublewide)</div>
<div class="line"><a name="l00353"></a><span class="lineno"> 353</span>  freqs[j] = fe_melinv(mel_fb, (i + j * 2) * melbw + melmin);</div>
<div class="line"><a name="l00354"></a><span class="lineno"> 354</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00355"></a><span class="lineno"> 355</span>  freqs[j] = fe_melinv(mel_fb, (i + j) * melbw + melmin);</div>
<div class="line"><a name="l00356"></a><span class="lineno"> 356</span>  <span class="comment">/* Round them to DFT points if requested */</span></div>
<div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  <span class="keywordflow">if</span> (mel_fb->round_filters)</div>
<div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  freqs[j] = ((int)(freqs[j] / fftfreq + 0.5)) * fftfreq;</div>
<div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  }</div>
<div class="line"><a name="l00360"></a><span class="lineno"> 360</span> </div>
<div class="line"><a name="l00361"></a><span class="lineno"> 361</span>  <span class="comment">/* spec_start is the start of this filter in the power spectrum. */</span></div>
<div class="line"><a name="l00362"></a><span class="lineno"> 362</span>  mel_fb->spec_start[i] = -1;</div>
<div class="line"><a name="l00363"></a><span class="lineno"> 363</span>  <span class="comment">/* There must be a better way... */</span></div>
<div class="line"><a name="l00364"></a><span class="lineno"> 364</span>  <span class="keywordflow">for</span> (j = 0; j < mel_fb->fft_size/2+1; ++j) {</div>
<div class="line"><a name="l00365"></a><span class="lineno"> 365</span>  float32 hz = j * fftfreq;</div>
<div class="line"><a name="l00366"></a><span class="lineno"> 366</span>  <span class="keywordflow">if</span> (hz < freqs[0])</div>
<div class="line"><a name="l00367"></a><span class="lineno"> 367</span>  <span class="keywordflow">continue</span>;</div>
<div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (hz > freqs[2] || j == mel_fb->fft_size/2) {</div>
<div class="line"><a name="l00369"></a><span class="lineno"> 369</span>  <span class="comment">/* filt_width is the width in DFT points of this filter. */</span></div>
<div class="line"><a name="l00370"></a><span class="lineno"> 370</span>  mel_fb->filt_width[i] = j - mel_fb->spec_start[i];</div>
<div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  <span class="comment">/* filt_start is the start of this filter in the filt_coeffs array. */</span></div>
<div class="line"><a name="l00372"></a><span class="lineno"> 372</span>  mel_fb->filt_start[i] = n_coeffs;</div>
<div class="line"><a name="l00373"></a><span class="lineno"> 373</span>  n_coeffs += mel_fb->filt_width[i];</div>
<div class="line"><a name="l00374"></a><span class="lineno"> 374</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  }</div>
<div class="line"><a name="l00376"></a><span class="lineno"> 376</span>  <span class="keywordflow">if</span> (mel_fb->spec_start[i] == -1)</div>
<div class="line"><a name="l00377"></a><span class="lineno"> 377</span>  mel_fb->spec_start[i] = j;</div>
<div class="line"><a name="l00378"></a><span class="lineno"> 378</span>  }</div>
<div class="line"><a name="l00379"></a><span class="lineno"> 379</span>  }</div>
<div class="line"><a name="l00380"></a><span class="lineno"> 380</span> </div>
<div class="line"><a name="l00381"></a><span class="lineno"> 381</span>  <span class="comment">/* Now go back and allocate the coefficient array. */</span></div>
<div class="line"><a name="l00382"></a><span class="lineno"> 382</span>  mel_fb->filt_coeffs = <a class="code" href="ckd__alloc_8h.html#a8e89a31c3c70710a8e023a177084bff2">ckd_malloc</a>(n_coeffs * <span class="keyword">sizeof</span>(*mel_fb->filt_coeffs));</div>
<div class="line"><a name="l00383"></a><span class="lineno"> 383</span> </div>
<div class="line"><a name="l00384"></a><span class="lineno"> 384</span>  <span class="comment">/* And now generate the coefficients. */</span></div>
<div class="line"><a name="l00385"></a><span class="lineno"> 385</span>  n_coeffs = 0;</div>
<div class="line"><a name="l00386"></a><span class="lineno"> 386</span>  <span class="keywordflow">for</span> (i = 0; i < mel_fb->num_filters; ++i) {</div>
<div class="line"><a name="l00387"></a><span class="lineno"> 387</span>  float32 freqs[3];</div>
<div class="line"><a name="l00388"></a><span class="lineno"> 388</span> </div>
<div class="line"><a name="l00389"></a><span class="lineno"> 389</span>  <span class="comment">/* Left, center, right frequencies in Hertz */</span></div>
<div class="line"><a name="l00390"></a><span class="lineno"> 390</span>  <span class="keywordflow">for</span> (j = 0; j < 3; ++j) {</div>
<div class="line"><a name="l00391"></a><span class="lineno"> 391</span>  <span class="keywordflow">if</span> (mel_fb->doublewide)</div>
<div class="line"><a name="l00392"></a><span class="lineno"> 392</span>  freqs[j] = fe_melinv(mel_fb, (i + j * 2) * melbw + melmin);</div>
<div class="line"><a name="l00393"></a><span class="lineno"> 393</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00394"></a><span class="lineno"> 394</span>  freqs[j] = fe_melinv(mel_fb, (i + j) * melbw + melmin);</div>
<div class="line"><a name="l00395"></a><span class="lineno"> 395</span>  <span class="comment">/* Round them to DFT points if requested */</span></div>
<div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  <span class="keywordflow">if</span> (mel_fb->round_filters)</div>
<div class="line"><a name="l00397"></a><span class="lineno"> 397</span>  freqs[j] = ((int)(freqs[j] / fftfreq + 0.5)) * fftfreq;</div>
<div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  }</div>
<div class="line"><a name="l00399"></a><span class="lineno"> 399</span> </div>
<div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  <span class="keywordflow">for</span> (j = 0; j < mel_fb->filt_width[i]; ++j) {</div>
<div class="line"><a name="l00401"></a><span class="lineno"> 401</span>  float32 hz, loslope, hislope;</div>
<div class="line"><a name="l00402"></a><span class="lineno"> 402</span> </div>
<div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  hz = (mel_fb->spec_start[i] + j) * fftfreq;</div>
<div class="line"><a name="l00404"></a><span class="lineno"> 404</span>  <span class="keywordflow">if</span> (hz < freqs[0] || hz > freqs[2]) {</div>
<div class="line"><a name="l00405"></a><span class="lineno"> 405</span>  <a class="code" href="err_8h.html#a1a4495946ab2449d61108fe829a94613">E_FATAL</a>(<span class="stringliteral">"Failed to create filterbank, frequency range does not match. "</span></div>
<div class="line"><a name="l00406"></a><span class="lineno"> 406</span>  <span class="stringliteral">"Sample rate %f, FFT size %d, lowerf %f < freq %f > upperf %f.\n"</span>, mel_fb->sampling_rate, mel_fb->fft_size, freqs[2], hz, freqs[0]);</div>
<div class="line"><a name="l00407"></a><span class="lineno"> 407</span>  }</div>
<div class="line"><a name="l00408"></a><span class="lineno"> 408</span>  loslope = (hz - freqs[0]) / (freqs[1] - freqs[0]);</div>
<div class="line"><a name="l00409"></a><span class="lineno"> 409</span>  hislope = (freqs[2] - hz) / (freqs[2] - freqs[1]);</div>
<div class="line"><a name="l00410"></a><span class="lineno"> 410</span>  <span class="keywordflow">if</span> (mel_fb->unit_area) {</div>
<div class="line"><a name="l00411"></a><span class="lineno"> 411</span>  loslope *= 2 / (freqs[2] - freqs[0]);</div>
<div class="line"><a name="l00412"></a><span class="lineno"> 412</span>  hislope *= 2 / (freqs[2] - freqs[0]);</div>
<div class="line"><a name="l00413"></a><span class="lineno"> 413</span>  }</div>
<div class="line"><a name="l00414"></a><span class="lineno"> 414</span>  <span class="keywordflow">if</span> (loslope < hislope) {</div>
<div class="line"><a name="l00415"></a><span class="lineno"> 415</span> <span class="preprocessor">#ifdef FIXED_POINT</span></div>
<div class="line"><a name="l00416"></a><span class="lineno"> 416</span>  mel_fb->filt_coeffs[n_coeffs] = fe_log(loslope);</div>
<div class="line"><a name="l00417"></a><span class="lineno"> 417</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00418"></a><span class="lineno"> 418</span>  mel_fb->filt_coeffs[n_coeffs] = loslope;</div>
<div class="line"><a name="l00419"></a><span class="lineno"> 419</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00420"></a><span class="lineno"> 420</span>  }</div>
<div class="line"><a name="l00421"></a><span class="lineno"> 421</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00422"></a><span class="lineno"> 422</span> <span class="preprocessor">#ifdef FIXED_POINT</span></div>
<div class="line"><a name="l00423"></a><span class="lineno"> 423</span>  mel_fb->filt_coeffs[n_coeffs] = fe_log(hislope);</div>
<div class="line"><a name="l00424"></a><span class="lineno"> 424</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00425"></a><span class="lineno"> 425</span>  mel_fb->filt_coeffs[n_coeffs] = hislope;</div>
<div class="line"><a name="l00426"></a><span class="lineno"> 426</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00427"></a><span class="lineno"> 427</span>  }</div>
<div class="line"><a name="l00428"></a><span class="lineno"> 428</span>  ++n_coeffs;</div>
<div class="line"><a name="l00429"></a><span class="lineno"> 429</span>  }</div>
<div class="line"><a name="l00430"></a><span class="lineno"> 430</span>  }</div>
<div class="line"><a name="l00431"></a><span class="lineno"> 431</span>  </div>
<div class="line"><a name="l00432"></a><span class="lineno"> 432</span> </div>
<div class="line"><a name="l00433"></a><span class="lineno"> 433</span>  <span class="keywordflow">return</span> FE_SUCCESS;</div>
<div class="line"><a name="l00434"></a><span class="lineno"> 434</span> }</div>
<div class="line"><a name="l00435"></a><span class="lineno"> 435</span> </div>
<div class="line"><a name="l00436"></a><span class="lineno"> 436</span> int32</div>
<div class="line"><a name="l00437"></a><span class="lineno"> 437</span> fe_compute_melcosine(<a class="code" href="structmelfb__s.html">melfb_t</a> * mel_fb)</div>
<div class="line"><a name="l00438"></a><span class="lineno"> 438</span> {</div>
<div class="line"><a name="l00439"></a><span class="lineno"> 439</span> </div>
<div class="line"><a name="l00440"></a><span class="lineno"> 440</span>  float64 freqstep;</div>
<div class="line"><a name="l00441"></a><span class="lineno"> 441</span>  int32 i, j;</div>
<div class="line"><a name="l00442"></a><span class="lineno"> 442</span> </div>
<div class="line"><a name="l00443"></a><span class="lineno"> 443</span>  mel_fb->mel_cosine =</div>
<div class="line"><a name="l00444"></a><span class="lineno"> 444</span>  (mfcc_t **) <a class="code" href="ckd__alloc_8h.html#a949e7b50fcd9697b1563fa57f50e9c4f">ckd_calloc_2d</a>(mel_fb->num_cepstra,</div>
<div class="line"><a name="l00445"></a><span class="lineno"> 445</span>  mel_fb->num_filters,</div>
<div class="line"><a name="l00446"></a><span class="lineno"> 446</span>  <span class="keyword">sizeof</span>(mfcc_t));</div>
<div class="line"><a name="l00447"></a><span class="lineno"> 447</span> </div>
<div class="line"><a name="l00448"></a><span class="lineno"> 448</span>  freqstep = M_PI / mel_fb->num_filters;</div>
<div class="line"><a name="l00449"></a><span class="lineno"> 449</span>  <span class="comment">/* NOTE: The first row vector is actually unnecessary but we leave</span></div>
<div class="line"><a name="l00450"></a><span class="lineno"> 450</span> <span class="comment"> * it in to avoid confusion. */</span></div>
<div class="line"><a name="l00451"></a><span class="lineno"> 451</span>  <span class="keywordflow">for</span> (i = 0; i < mel_fb->num_cepstra; i++) {</div>
<div class="line"><a name="l00452"></a><span class="lineno"> 452</span>  <span class="keywordflow">for</span> (j = 0; j < mel_fb->num_filters; j++) {</div>
<div class="line"><a name="l00453"></a><span class="lineno"> 453</span>  float64 cosine;</div>
<div class="line"><a name="l00454"></a><span class="lineno"> 454</span> </div>
<div class="line"><a name="l00455"></a><span class="lineno"> 455</span>  cosine = cos(freqstep * i * (j + 0.5));</div>
<div class="line"><a name="l00456"></a><span class="lineno"> 456</span>  mel_fb->mel_cosine[i][j] = FLOAT2COS(cosine);</div>
<div class="line"><a name="l00457"></a><span class="lineno"> 457</span>  }</div>
<div class="line"><a name="l00458"></a><span class="lineno"> 458</span>  }</div>
<div class="line"><a name="l00459"></a><span class="lineno"> 459</span> </div>
<div class="line"><a name="l00460"></a><span class="lineno"> 460</span>  <span class="comment">/* Also precompute normalization constants for unitary DCT. */</span></div>
<div class="line"><a name="l00461"></a><span class="lineno"> 461</span>  mel_fb->sqrt_inv_n = FLOAT2COS(sqrt(1.0 / mel_fb->num_filters));</div>
<div class="line"><a name="l00462"></a><span class="lineno"> 462</span>  mel_fb->sqrt_inv_2n = FLOAT2COS(sqrt(2.0 / mel_fb->num_filters));</div>
<div class="line"><a name="l00463"></a><span class="lineno"> 463</span> </div>
<div class="line"><a name="l00464"></a><span class="lineno"> 464</span>  <span class="comment">/* And liftering weights */</span></div>
<div class="line"><a name="l00465"></a><span class="lineno"> 465</span>  <span class="keywordflow">if</span> (mel_fb->lifter_val) {</div>
<div class="line"><a name="l00466"></a><span class="lineno"> 466</span>  mel_fb->lifter = calloc(mel_fb->num_cepstra, <span class="keyword">sizeof</span>(*mel_fb->lifter));</div>
<div class="line"><a name="l00467"></a><span class="lineno"> 467</span>  <span class="keywordflow">for</span> (i = 0; i < mel_fb->num_cepstra; ++i) {</div>
<div class="line"><a name="l00468"></a><span class="lineno"> 468</span>  mel_fb->lifter[i] = FLOAT2MFCC(1 + mel_fb->lifter_val / 2</div>
<div class="line"><a name="l00469"></a><span class="lineno"> 469</span>  * sin(i * M_PI / mel_fb->lifter_val));</div>
<div class="line"><a name="l00470"></a><span class="lineno"> 470</span>  }</div>
<div class="line"><a name="l00471"></a><span class="lineno"> 471</span>  }</div>
<div class="line"><a name="l00472"></a><span class="lineno"> 472</span> </div>
<div class="line"><a name="l00473"></a><span class="lineno"> 473</span>  <span class="keywordflow">return</span> (0);</div>
<div class="line"><a name="l00474"></a><span class="lineno"> 474</span> }</div>
<div class="line"><a name="l00475"></a><span class="lineno"> 475</span> </div>
<div class="line"><a name="l00476"></a><span class="lineno"> 476</span> <span class="keyword">static</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00477"></a><span class="lineno"> 477</span> fe_pre_emphasis(int16 <span class="keyword">const</span> *in, frame_t * out, int32 len,</div>
<div class="line"><a name="l00478"></a><span class="lineno"> 478</span>  float32 factor, int16 prior)</div>
<div class="line"><a name="l00479"></a><span class="lineno"> 479</span> {</div>
<div class="line"><a name="l00480"></a><span class="lineno"> 480</span>  <span class="keywordtype">int</span> i;</div>
<div class="line"><a name="l00481"></a><span class="lineno"> 481</span> </div>
<div class="line"><a name="l00482"></a><span class="lineno"> 482</span> <span class="preprocessor">#if defined(FIXED16)</span></div>
<div class="line"><a name="l00483"></a><span class="lineno"> 483</span>  int16 fxd_alpha = (int16)(factor * 0x8000);</div>
<div class="line"><a name="l00484"></a><span class="lineno"> 484</span>  int32 tmp1, tmp2;</div>
<div class="line"><a name="l00485"></a><span class="lineno"> 485</span> </div>
<div class="line"><a name="l00486"></a><span class="lineno"> 486</span>  tmp1 = (int32)in[0] << 15;</div>
<div class="line"><a name="l00487"></a><span class="lineno"> 487</span>  tmp2 = (int32)prior * fxd_alpha;</div>
<div class="line"><a name="l00488"></a><span class="lineno"> 488</span>  out[0] = (int16)((tmp1 - tmp2) >> 15);</div>
<div class="line"><a name="l00489"></a><span class="lineno"> 489</span>  <span class="keywordflow">for</span> (i = 1; i < len; ++i) {</div>
<div class="line"><a name="l00490"></a><span class="lineno"> 490</span>  tmp1 = (int32)in[i] << 15;</div>
<div class="line"><a name="l00491"></a><span class="lineno"> 491</span>  tmp2 = (int32)in[i-1] * fxd_alpha;</div>
<div class="line"><a name="l00492"></a><span class="lineno"> 492</span>  out[i] = (int16)((tmp1 - tmp2) >> 15);</div>
<div class="line"><a name="l00493"></a><span class="lineno"> 493</span>  }</div>
<div class="line"><a name="l00494"></a><span class="lineno"> 494</span> <span class="preprocessor">#elif defined(FIXED_POINT)</span></div>
<div class="line"><a name="l00495"></a><span class="lineno"> 495</span>  fixed32 fxd_alpha = FLOAT2FIX(factor);</div>
<div class="line"><a name="l00496"></a><span class="lineno"> 496</span>  out[0] = ((fixed32)in[0] << DEFAULT_RADIX) - (prior * fxd_alpha);</div>
<div class="line"><a name="l00497"></a><span class="lineno"> 497</span>  <span class="keywordflow">for</span> (i = 1; i < len; ++i)</div>
<div class="line"><a name="l00498"></a><span class="lineno"> 498</span>  out[i] = ((fixed32)in[i] << DEFAULT_RADIX)</div>
<div class="line"><a name="l00499"></a><span class="lineno"> 499</span>  - (fixed32)in[i-1] * fxd_alpha;</div>
<div class="line"><a name="l00500"></a><span class="lineno"> 500</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00501"></a><span class="lineno"> 501</span>  out[0] = (frame_t) in[0] - (frame_t) prior * factor;</div>
<div class="line"><a name="l00502"></a><span class="lineno"> 502</span>  <span class="keywordflow">for</span> (i = 1; i < len; i++)</div>
<div class="line"><a name="l00503"></a><span class="lineno"> 503</span>  out[i] = (frame_t) in[i] - (frame_t) in[i-1] * factor;</div>
<div class="line"><a name="l00504"></a><span class="lineno"> 504</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00505"></a><span class="lineno"> 505</span> }</div>
<div class="line"><a name="l00506"></a><span class="lineno"> 506</span> </div>
<div class="line"><a name="l00507"></a><span class="lineno"> 507</span> <span class="keyword">static</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00508"></a><span class="lineno"> 508</span> fe_short_to_frame(int16 <span class="keyword">const</span> *in, frame_t * out, int32 len)</div>
<div class="line"><a name="l00509"></a><span class="lineno"> 509</span> {</div>
<div class="line"><a name="l00510"></a><span class="lineno"> 510</span>  <span class="keywordtype">int</span> i;</div>
<div class="line"><a name="l00511"></a><span class="lineno"> 511</span> </div>
<div class="line"><a name="l00512"></a><span class="lineno"> 512</span> <span class="preprocessor">#if defined(FIXED16)</span></div>
<div class="line"><a name="l00513"></a><span class="lineno"> 513</span>  memcpy(out, in, len * <span class="keyword">sizeof</span>(*out));</div>
<div class="line"><a name="l00514"></a><span class="lineno"> 514</span> <span class="preprocessor">#elif defined(FIXED_POINT)</span></div>
<div class="line"><a name="l00515"></a><span class="lineno"> 515</span>  <span class="keywordflow">for</span> (i = 0; i < len; i++)</div>
<div class="line"><a name="l00516"></a><span class="lineno"> 516</span>  out[i] = (int32) in[i] << DEFAULT_RADIX;</div>
<div class="line"><a name="l00517"></a><span class="lineno"> 517</span> <span class="preprocessor">#else </span><span class="comment">/* FIXED_POINT */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00518"></a><span class="lineno"> 518</span>  <span class="keywordflow">for</span> (i = 0; i < len; i++)</div>
<div class="line"><a name="l00519"></a><span class="lineno"> 519</span>  out[i] = (frame_t) in[i];</div>
<div class="line"><a name="l00520"></a><span class="lineno"> 520</span> <span class="preprocessor">#endif </span><span class="comment">/* FIXED_POINT */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00521"></a><span class="lineno"> 521</span> }</div>
<div class="line"><a name="l00522"></a><span class="lineno"> 522</span> </div>
<div class="line"><a name="l00523"></a><span class="lineno"> 523</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00524"></a><span class="lineno"> 524</span> fe_create_hamming(window_t * in, int32 in_len)</div>
<div class="line"><a name="l00525"></a><span class="lineno"> 525</span> {</div>
<div class="line"><a name="l00526"></a><span class="lineno"> 526</span>  <span class="keywordtype">int</span> i;</div>
<div class="line"><a name="l00527"></a><span class="lineno"> 527</span> </div>
<div class="line"><a name="l00528"></a><span class="lineno"> 528</span>  <span class="comment">/* Symmetric, so we only create the first half of it. */</span></div>
<div class="line"><a name="l00529"></a><span class="lineno"> 529</span>  <span class="keywordflow">for</span> (i = 0; i < in_len / 2; i++) {</div>
<div class="line"><a name="l00530"></a><span class="lineno"> 530</span>  float64 hamm;</div>
<div class="line"><a name="l00531"></a><span class="lineno"> 531</span>  hamm = (0.54 - 0.46 * cos(2 * M_PI * i /</div>
<div class="line"><a name="l00532"></a><span class="lineno"> 532</span>  ((float64) in_len - 1.0)));</div>
<div class="line"><a name="l00533"></a><span class="lineno"> 533</span> <span class="preprocessor">#ifdef FIXED16</span></div>
<div class="line"><a name="l00534"></a><span class="lineno"> 534</span>  in[i] = (int16)(hamm * 0x8000);</div>
<div class="line"><a name="l00535"></a><span class="lineno"> 535</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00536"></a><span class="lineno"> 536</span>  in[i] = FLOAT2COS(hamm);</div>
<div class="line"><a name="l00537"></a><span class="lineno"> 537</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00538"></a><span class="lineno"> 538</span>  }</div>
<div class="line"><a name="l00539"></a><span class="lineno"> 539</span> }</div>
<div class="line"><a name="l00540"></a><span class="lineno"> 540</span> </div>
<div class="line"><a name="l00541"></a><span class="lineno"> 541</span> <span class="keyword">static</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00542"></a><span class="lineno"> 542</span> fe_hamming_window(frame_t * in, window_t * window, int32 in_len, int32 remove_dc)</div>
<div class="line"><a name="l00543"></a><span class="lineno"> 543</span> {</div>
<div class="line"><a name="l00544"></a><span class="lineno"> 544</span>  <span class="keywordtype">int</span> i;</div>
<div class="line"><a name="l00545"></a><span class="lineno"> 545</span> </div>
<div class="line"><a name="l00546"></a><span class="lineno"> 546</span>  <span class="keywordflow">if</span> (remove_dc) {</div>
<div class="line"><a name="l00547"></a><span class="lineno"> 547</span> <span class="preprocessor">#ifdef FIXED16</span></div>
<div class="line"><a name="l00548"></a><span class="lineno"> 548</span>  int32 mean = 0; <span class="comment">/* Use int32 to avoid possibility of overflow */</span></div>
<div class="line"><a name="l00549"></a><span class="lineno"> 549</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00550"></a><span class="lineno"> 550</span>  frame_t mean = 0;</div>
<div class="line"><a name="l00551"></a><span class="lineno"> 551</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00552"></a><span class="lineno"> 552</span> </div>
<div class="line"><a name="l00553"></a><span class="lineno"> 553</span>  <span class="keywordflow">for</span> (i = 0; i < in_len; i++)</div>
<div class="line"><a name="l00554"></a><span class="lineno"> 554</span>  mean += in[i];</div>
<div class="line"><a name="l00555"></a><span class="lineno"> 555</span>  mean /= in_len;</div>
<div class="line"><a name="l00556"></a><span class="lineno"> 556</span>  <span class="keywordflow">for</span> (i = 0; i < in_len; i++)</div>
<div class="line"><a name="l00557"></a><span class="lineno"> 557</span>  in[i] -= (frame_t)mean;</div>
<div class="line"><a name="l00558"></a><span class="lineno"> 558</span>  }</div>
<div class="line"><a name="l00559"></a><span class="lineno"> 559</span> </div>
<div class="line"><a name="l00560"></a><span class="lineno"> 560</span> <span class="preprocessor">#ifdef FIXED16</span></div>
<div class="line"><a name="l00561"></a><span class="lineno"> 561</span>  <span class="keywordflow">for</span> (i = 0; i < in_len/2; i++) {</div>
<div class="line"><a name="l00562"></a><span class="lineno"> 562</span>  int32 tmp1, tmp2;</div>
<div class="line"><a name="l00563"></a><span class="lineno"> 563</span> </div>
<div class="line"><a name="l00564"></a><span class="lineno"> 564</span>  tmp1 = (int32)in[i] * window[i];</div>
<div class="line"><a name="l00565"></a><span class="lineno"> 565</span>  tmp2 = (int32)in[in_len-1-i] * window[i];</div>
<div class="line"><a name="l00566"></a><span class="lineno"> 566</span>  in[i] = (int16)(tmp1 >> 15);</div>
<div class="line"><a name="l00567"></a><span class="lineno"> 567</span>  in[in_len-1-i] = (int16)(tmp2 >> 15);</div>
<div class="line"><a name="l00568"></a><span class="lineno"> 568</span>  }</div>
<div class="line"><a name="l00569"></a><span class="lineno"> 569</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00570"></a><span class="lineno"> 570</span>  <span class="keywordflow">for</span> (i = 0; i < in_len/2; i++) {</div>
<div class="line"><a name="l00571"></a><span class="lineno"> 571</span>  in[i] = COSMUL(in[i], window[i]);</div>
<div class="line"><a name="l00572"></a><span class="lineno"> 572</span>  in[in_len-1-i] = COSMUL(in[in_len-1-i], window[i]);</div>
<div class="line"><a name="l00573"></a><span class="lineno"> 573</span>  }</div>
<div class="line"><a name="l00574"></a><span class="lineno"> 574</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00575"></a><span class="lineno"> 575</span> }</div>
<div class="line"><a name="l00576"></a><span class="lineno"> 576</span> </div>
<div class="line"><a name="l00577"></a><span class="lineno"> 577</span> <span class="keyword">static</span> <span class="keywordtype">int</span></div>
<div class="line"><a name="l00578"></a><span class="lineno"> 578</span> fe_spch_to_frame(<a class="code" href="structfe__s.html">fe_t</a> *fe, <span class="keywordtype">int</span> len)</div>
<div class="line"><a name="l00579"></a><span class="lineno"> 579</span> {</div>
<div class="line"><a name="l00580"></a><span class="lineno"> 580</span>  <span class="comment">/* Copy to the frame buffer. */</span></div>
<div class="line"><a name="l00581"></a><span class="lineno"> 581</span>  <span class="keywordflow">if</span> (fe->pre_emphasis_alpha != 0.0) {</div>
<div class="line"><a name="l00582"></a><span class="lineno"> 582</span>  fe_pre_emphasis(fe->spch, fe->frame, len,</div>
<div class="line"><a name="l00583"></a><span class="lineno"> 583</span>  fe->pre_emphasis_alpha, fe->prior);</div>
<div class="line"><a name="l00584"></a><span class="lineno"> 584</span>  <span class="keywordflow">if</span> (len >= fe->frame_shift)</div>
<div class="line"><a name="l00585"></a><span class="lineno"> 585</span>  fe->prior = fe->spch[fe->frame_shift - 1];</div>
<div class="line"><a name="l00586"></a><span class="lineno"> 586</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00587"></a><span class="lineno"> 587</span>  fe->prior = fe->spch[len - 1];</div>
<div class="line"><a name="l00588"></a><span class="lineno"> 588</span>  }</div>
<div class="line"><a name="l00589"></a><span class="lineno"> 589</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00590"></a><span class="lineno"> 590</span>  fe_short_to_frame(fe->spch, fe->frame, len);</div>
<div class="line"><a name="l00591"></a><span class="lineno"> 591</span> </div>
<div class="line"><a name="l00592"></a><span class="lineno"> 592</span>  <span class="comment">/* Zero pad up to FFT size. */</span></div>
<div class="line"><a name="l00593"></a><span class="lineno"> 593</span>  memset(fe->frame + len, 0,</div>
<div class="line"><a name="l00594"></a><span class="lineno"> 594</span>  (fe->fft_size - len) * <span class="keyword">sizeof</span>(*fe->frame));</div>
<div class="line"><a name="l00595"></a><span class="lineno"> 595</span> </div>
<div class="line"><a name="l00596"></a><span class="lineno"> 596</span>  <span class="comment">/* Window. */</span></div>
<div class="line"><a name="l00597"></a><span class="lineno"> 597</span>  fe_hamming_window(fe->frame, fe->hamming_window, fe->frame_size,</div>
<div class="line"><a name="l00598"></a><span class="lineno"> 598</span>  fe->remove_dc);</div>
<div class="line"><a name="l00599"></a><span class="lineno"> 599</span> </div>
<div class="line"><a name="l00600"></a><span class="lineno"> 600</span>  <span class="keywordflow">return</span> len;</div>
<div class="line"><a name="l00601"></a><span class="lineno"> 601</span> }</div>
<div class="line"><a name="l00602"></a><span class="lineno"> 602</span> </div>
<div class="line"><a name="l00603"></a><span class="lineno"> 603</span> <span class="keywordtype">int</span></div>
<div class="line"><a name="l00604"></a><span class="lineno"> 604</span> fe_read_frame(<a class="code" href="structfe__s.html">fe_t</a> *fe, int16 <span class="keyword">const</span> *in, int32 len)</div>
<div class="line"><a name="l00605"></a><span class="lineno"> 605</span> {</div>
<div class="line"><a name="l00606"></a><span class="lineno"> 606</span>  <span class="keywordtype">int</span> i;</div>
<div class="line"><a name="l00607"></a><span class="lineno"> 607</span> </div>
<div class="line"><a name="l00608"></a><span class="lineno"> 608</span>  <span class="keywordflow">if</span> (len > fe->frame_size)</div>
<div class="line"><a name="l00609"></a><span class="lineno"> 609</span>  len = fe->frame_size;</div>
<div class="line"><a name="l00610"></a><span class="lineno"> 610</span> </div>
<div class="line"><a name="l00611"></a><span class="lineno"> 611</span>  <span class="comment">/* Read it into the raw speech buffer. */</span></div>
<div class="line"><a name="l00612"></a><span class="lineno"> 612</span>  memcpy(fe->spch, in, len * <span class="keyword">sizeof</span>(*in));</div>
<div class="line"><a name="l00613"></a><span class="lineno"> 613</span>  <span class="comment">/* Swap and dither if necessary. */</span></div>
<div class="line"><a name="l00614"></a><span class="lineno"> 614</span>  <span class="keywordflow">if</span> (fe->swap)</div>
<div class="line"><a name="l00615"></a><span class="lineno"> 615</span>  <span class="keywordflow">for</span> (i = 0; i < len; ++i)</div>
<div class="line"><a name="l00616"></a><span class="lineno"> 616</span>  SWAP_INT16(&fe->spch[i]);</div>
<div class="line"><a name="l00617"></a><span class="lineno"> 617</span>  <span class="keywordflow">if</span> (fe->dither)</div>
<div class="line"><a name="l00618"></a><span class="lineno"> 618</span>  <span class="keywordflow">for</span> (i = 0; i < len; ++i)</div>
<div class="line"><a name="l00619"></a><span class="lineno"> 619</span>  fe->spch[i] += (int16) ((!(s3_rand_int31() % 4)) ? 1 : 0);</div>
<div class="line"><a name="l00620"></a><span class="lineno"> 620</span> </div>
<div class="line"><a name="l00621"></a><span class="lineno"> 621</span>  <span class="keywordflow">return</span> fe_spch_to_frame(fe, len);</div>
<div class="line"><a name="l00622"></a><span class="lineno"> 622</span> }</div>
<div class="line"><a name="l00623"></a><span class="lineno"> 623</span> </div>
<div class="line"><a name="l00624"></a><span class="lineno"> 624</span> <span class="keywordtype">int</span></div>
<div class="line"><a name="l00625"></a><span class="lineno"> 625</span> fe_shift_frame(<a class="code" href="structfe__s.html">fe_t</a> *fe, int16 <span class="keyword">const</span> *in, int32 len)</div>
<div class="line"><a name="l00626"></a><span class="lineno"> 626</span> {</div>
<div class="line"><a name="l00627"></a><span class="lineno"> 627</span>  <span class="keywordtype">int</span> offset, i;</div>
<div class="line"><a name="l00628"></a><span class="lineno"> 628</span> </div>
<div class="line"><a name="l00629"></a><span class="lineno"> 629</span>  <span class="keywordflow">if</span> (len > fe->frame_shift)</div>
<div class="line"><a name="l00630"></a><span class="lineno"> 630</span>  len = fe->frame_shift;</div>
<div class="line"><a name="l00631"></a><span class="lineno"> 631</span>  offset = fe->frame_size - fe->frame_shift;</div>
<div class="line"><a name="l00632"></a><span class="lineno"> 632</span> </div>
<div class="line"><a name="l00633"></a><span class="lineno"> 633</span>  <span class="comment">/* Shift data into the raw speech buffer. */</span></div>
<div class="line"><a name="l00634"></a><span class="lineno"> 634</span>  memmove(fe->spch, fe->spch + fe->frame_shift,</div>
<div class="line"><a name="l00635"></a><span class="lineno"> 635</span>  offset * <span class="keyword">sizeof</span>(*fe->spch));</div>
<div class="line"><a name="l00636"></a><span class="lineno"> 636</span>  memcpy(fe->spch + offset, in, len * <span class="keyword">sizeof</span>(*fe->spch));</div>
<div class="line"><a name="l00637"></a><span class="lineno"> 637</span>  <span class="comment">/* Swap and dither if necessary. */</span></div>
<div class="line"><a name="l00638"></a><span class="lineno"> 638</span>  <span class="keywordflow">if</span> (fe->swap)</div>
<div class="line"><a name="l00639"></a><span class="lineno"> 639</span>  <span class="keywordflow">for</span> (i = 0; i < len; ++i)</div>
<div class="line"><a name="l00640"></a><span class="lineno"> 640</span>  SWAP_INT16(&fe->spch[offset + i]);</div>
<div class="line"><a name="l00641"></a><span class="lineno"> 641</span>  <span class="keywordflow">if</span> (fe->dither)</div>
<div class="line"><a name="l00642"></a><span class="lineno"> 642</span>  <span class="keywordflow">for</span> (i = 0; i < len; ++i)</div>
<div class="line"><a name="l00643"></a><span class="lineno"> 643</span>  fe->spch[offset + i]</div>
<div class="line"><a name="l00644"></a><span class="lineno"> 644</span>  += (int16) ((!(s3_rand_int31() % 4)) ? 1 : 0);</div>
<div class="line"><a name="l00645"></a><span class="lineno"> 645</span>  </div>
<div class="line"><a name="l00646"></a><span class="lineno"> 646</span>  <span class="keywordflow">return</span> fe_spch_to_frame(fe, offset + len);</div>
<div class="line"><a name="l00647"></a><span class="lineno"> 647</span> }</div>
<div class="line"><a name="l00648"></a><span class="lineno"> 648</span> </div>
<div class="line"><a name="l00652"></a><span class="lineno"> 652</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00653"></a><span class="lineno"> 653</span> fe_create_twiddle(<a class="code" href="structfe__s.html">fe_t</a> *fe)</div>
<div class="line"><a name="l00654"></a><span class="lineno"> 654</span> {</div>
<div class="line"><a name="l00655"></a><span class="lineno"> 655</span>  <span class="keywordtype">int</span> i;</div>
<div class="line"><a name="l00656"></a><span class="lineno"> 656</span> </div>
<div class="line"><a name="l00657"></a><span class="lineno"> 657</span>  <span class="keywordflow">for</span> (i = 0; i < fe->fft_size / 4; ++i) {</div>
<div class="line"><a name="l00658"></a><span class="lineno"> 658</span>  float64 a = 2 * M_PI * i / fe->fft_size;</div>
<div class="line"><a name="l00659"></a><span class="lineno"> 659</span> <span class="preprocessor">#ifdef FIXED16</span></div>
<div class="line"><a name="l00660"></a><span class="lineno"> 660</span>  fe->ccc[i] = (int16)(cos(a) * 0x8000);</div>
<div class="line"><a name="l00661"></a><span class="lineno"> 661</span>  fe->sss[i] = (int16)(sin(a) * 0x8000);</div>
<div class="line"><a name="l00662"></a><span class="lineno"> 662</span> <span class="preprocessor">#elif defined(FIXED_POINT)</span></div>
<div class="line"><a name="l00663"></a><span class="lineno"> 663</span>  fe->ccc[i] = FLOAT2COS(cos(a));</div>
<div class="line"><a name="l00664"></a><span class="lineno"> 664</span>  fe->sss[i] = FLOAT2COS(sin(a));</div>
<div class="line"><a name="l00665"></a><span class="lineno"> 665</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00666"></a><span class="lineno"> 666</span>  fe->ccc[i] = cos(a);</div>
<div class="line"><a name="l00667"></a><span class="lineno"> 667</span>  fe->sss[i] = sin(a);</div>
<div class="line"><a name="l00668"></a><span class="lineno"> 668</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00669"></a><span class="lineno"> 669</span>  }</div>
<div class="line"><a name="l00670"></a><span class="lineno"> 670</span> }</div>
<div class="line"><a name="l00671"></a><span class="lineno"> 671</span> </div>
<div class="line"><a name="l00672"></a><span class="lineno"> 672</span> <span class="comment">/* Translated from the FORTRAN (obviously) from "Real-Valued Fast</span></div>
<div class="line"><a name="l00673"></a><span class="lineno"> 673</span> <span class="comment"> * Fourier Transform Algorithms" by Henrik V. Sorensen et al., IEEE</span></div>
<div class="line"><a name="l00674"></a><span class="lineno"> 674</span> <span class="comment"> * Transactions on Acoustics, Speech, and Signal Processing, vol. 35,</span></div>
<div class="line"><a name="l00675"></a><span class="lineno"> 675</span> <span class="comment"> * no.6. The 16-bit version does a version of "block floating</span></div>
<div class="line"><a name="l00676"></a><span class="lineno"> 676</span> <span class="comment"> * point" in order to avoid rounding errors.</span></div>
<div class="line"><a name="l00677"></a><span class="lineno"> 677</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00678"></a><span class="lineno"> 678</span> <span class="preprocessor">#if defined(FIXED16)</span></div>
<div class="line"><a name="l00679"></a><span class="lineno"> 679</span> <span class="keyword">static</span> <span class="keywordtype">int</span></div>
<div class="line"><a name="l00680"></a><span class="lineno"> 680</span> fe_fft_real(<a class="code" href="structfe__s.html">fe_t</a> *fe)</div>
<div class="line"><a name="l00681"></a><span class="lineno"> 681</span> {</div>
<div class="line"><a name="l00682"></a><span class="lineno"> 682</span>  <span class="keywordtype">int</span> i, j, k, m, n, lz;</div>
<div class="line"><a name="l00683"></a><span class="lineno"> 683</span>  frame_t *x, xt, max;</div>
<div class="line"><a name="l00684"></a><span class="lineno"> 684</span> </div>
<div class="line"><a name="l00685"></a><span class="lineno"> 685</span>  x = fe->frame;</div>
<div class="line"><a name="l00686"></a><span class="lineno"> 686</span>  m = fe->fft_order;</div>
<div class="line"><a name="l00687"></a><span class="lineno"> 687</span>  n = fe->fft_size;</div>
<div class="line"><a name="l00688"></a><span class="lineno"> 688</span> </div>
<div class="line"><a name="l00689"></a><span class="lineno"> 689</span>  <span class="comment">/* Bit-reverse the input. */</span></div>
<div class="line"><a name="l00690"></a><span class="lineno"> 690</span>  j = 0;</div>
<div class="line"><a name="l00691"></a><span class="lineno"> 691</span>  <span class="keywordflow">for</span> (i = 0; i < n - 1; ++i) {</div>
<div class="line"><a name="l00692"></a><span class="lineno"> 692</span>  <span class="keywordflow">if</span> (i < j) {</div>
<div class="line"><a name="l00693"></a><span class="lineno"> 693</span>  xt = x[j];</div>
<div class="line"><a name="l00694"></a><span class="lineno"> 694</span>  x[j] = x[i];</div>
<div class="line"><a name="l00695"></a><span class="lineno"> 695</span>  x[i] = xt;</div>
<div class="line"><a name="l00696"></a><span class="lineno"> 696</span>  }</div>
<div class="line"><a name="l00697"></a><span class="lineno"> 697</span>  k = n / 2;</div>
<div class="line"><a name="l00698"></a><span class="lineno"> 698</span>  <span class="keywordflow">while</span> (k <= j) {</div>
<div class="line"><a name="l00699"></a><span class="lineno"> 699</span>  j -= k;</div>
<div class="line"><a name="l00700"></a><span class="lineno"> 700</span>  k /= 2;</div>
<div class="line"><a name="l00701"></a><span class="lineno"> 701</span>  }</div>
<div class="line"><a name="l00702"></a><span class="lineno"> 702</span>  j += k;</div>
<div class="line"><a name="l00703"></a><span class="lineno"> 703</span>  }</div>
<div class="line"><a name="l00704"></a><span class="lineno"> 704</span>  <span class="comment">/* Determine how many bits of dynamic range are in the input. */</span></div>
<div class="line"><a name="l00705"></a><span class="lineno"> 705</span>  max = 0;</div>
<div class="line"><a name="l00706"></a><span class="lineno"> 706</span>  <span class="keywordflow">for</span> (i = 0; i < n; ++i)</div>
<div class="line"><a name="l00707"></a><span class="lineno"> 707</span>  <span class="keywordflow">if</span> (abs(x[i]) > max)</div>
<div class="line"><a name="l00708"></a><span class="lineno"> 708</span>  max = abs(x[i]);</div>
<div class="line"><a name="l00709"></a><span class="lineno"> 709</span>  <span class="comment">/* The FFT has a gain of M bits, so we need to attenuate the input</span></div>
<div class="line"><a name="l00710"></a><span class="lineno"> 710</span> <span class="comment"> * by M bits minus the number of leading zeroes in the input's</span></div>
<div class="line"><a name="l00711"></a><span class="lineno"> 711</span> <span class="comment"> * range in order to avoid overflows. */</span></div>
<div class="line"><a name="l00712"></a><span class="lineno"> 712</span>  <span class="keywordflow">for</span> (lz = 0; lz < m; ++lz)</div>
<div class="line"><a name="l00713"></a><span class="lineno"> 713</span>  <span class="keywordflow">if</span> (max & (1 << (15-lz)))</div>
<div class="line"><a name="l00714"></a><span class="lineno"> 714</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00715"></a><span class="lineno"> 715</span> </div>
<div class="line"><a name="l00716"></a><span class="lineno"> 716</span>  <span class="comment">/* Basic butterflies (2-point FFT, real twiddle factors):</span></div>
<div class="line"><a name="l00717"></a><span class="lineno"> 717</span> <span class="comment"> * x[i] = x[i] + 1 * x[i+1]</span></div>
<div class="line"><a name="l00718"></a><span class="lineno"> 718</span> <span class="comment"> * x[i+1] = x[i] + -1 * x[i+1]</span></div>
<div class="line"><a name="l00719"></a><span class="lineno"> 719</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00720"></a><span class="lineno"> 720</span>  <span class="comment">/* The quantization error introduced by attenuating the input at</span></div>
<div class="line"><a name="l00721"></a><span class="lineno"> 721</span> <span class="comment"> * any given stage of the FFT has a cascading effect, so we hold</span></div>
<div class="line"><a name="l00722"></a><span class="lineno"> 722</span> <span class="comment"> * off on it until it's absolutely necessary. */</span></div>
<div class="line"><a name="l00723"></a><span class="lineno"> 723</span>  <span class="keywordflow">for</span> (i = 0; i < n; i += 2) {</div>
<div class="line"><a name="l00724"></a><span class="lineno"> 724</span>  <span class="keywordtype">int</span> atten = (lz == 0);</div>
<div class="line"><a name="l00725"></a><span class="lineno"> 725</span>  xt = x[i] >> atten;</div>
<div class="line"><a name="l00726"></a><span class="lineno"> 726</span>  x[i] = xt + (x[i + 1] >> atten);</div>
<div class="line"><a name="l00727"></a><span class="lineno"> 727</span>  x[i + 1] = xt - (x[i + 1] >> atten);</div>
<div class="line"><a name="l00728"></a><span class="lineno"> 728</span>  }</div>
<div class="line"><a name="l00729"></a><span class="lineno"> 729</span> </div>
<div class="line"><a name="l00730"></a><span class="lineno"> 730</span>  <span class="comment">/* The rest of the butterflies, in stages from 1..m */</span></div>
<div class="line"><a name="l00731"></a><span class="lineno"> 731</span>  <span class="keywordflow">for</span> (k = 1; k < m; ++k) {</div>
<div class="line"><a name="l00732"></a><span class="lineno"> 732</span>  <span class="keywordtype">int</span> n1, n2, n4;</div>
<div class="line"><a name="l00733"></a><span class="lineno"> 733</span>  <span class="comment">/* Start attenuating once we hit the number of leading zeros. */</span></div>
<div class="line"><a name="l00734"></a><span class="lineno"> 734</span>  <span class="keywordtype">int</span> atten = (k >= lz);</div>
<div class="line"><a name="l00735"></a><span class="lineno"> 735</span> </div>
<div class="line"><a name="l00736"></a><span class="lineno"> 736</span>  n4 = k - 1;</div>
<div class="line"><a name="l00737"></a><span class="lineno"> 737</span>  n2 = k;</div>
<div class="line"><a name="l00738"></a><span class="lineno"> 738</span>  n1 = k + 1;</div>
<div class="line"><a name="l00739"></a><span class="lineno"> 739</span>  <span class="comment">/* Stride over each (1 << (k+1)) points */</span></div>
<div class="line"><a name="l00740"></a><span class="lineno"> 740</span>  <span class="keywordflow">for</span> (i = 0; i < n; i += (1 << n1)) {</div>
<div class="line"><a name="l00741"></a><span class="lineno"> 741</span>  <span class="comment">/* Basic butterfly with real twiddle factors:</span></div>
<div class="line"><a name="l00742"></a><span class="lineno"> 742</span> <span class="comment"> * x[i] = x[i] + 1 * x[i + (1<<k)]</span></div>
<div class="line"><a name="l00743"></a><span class="lineno"> 743</span> <span class="comment"> * x[i + (1<<k)] = x[i] + -1 * x[i + (1<<k)]</span></div>
<div class="line"><a name="l00744"></a><span class="lineno"> 744</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00745"></a><span class="lineno"> 745</span>  xt = x[i] >> atten;</div>
<div class="line"><a name="l00746"></a><span class="lineno"> 746</span>  x[i] = xt + (x[i + (1 << n2)] >> atten);</div>
<div class="line"><a name="l00747"></a><span class="lineno"> 747</span>  x[i + (1 << n2)] = xt - (x[i + (1 << n2)] >> atten);</div>
<div class="line"><a name="l00748"></a><span class="lineno"> 748</span> </div>
<div class="line"><a name="l00749"></a><span class="lineno"> 749</span>  <span class="comment">/* The other ones with real twiddle factors:</span></div>
<div class="line"><a name="l00750"></a><span class="lineno"> 750</span> <span class="comment"> * x[i + (1<<k) + (1<<(k-1))]</span></div>
<div class="line"><a name="l00751"></a><span class="lineno"> 751</span> <span class="comment"> * = 0 * x[i + (1<<k-1)] + -1 * x[i + (1<<k) + (1<<k-1)]</span></div>
<div class="line"><a name="l00752"></a><span class="lineno"> 752</span> <span class="comment"> * x[i + (1<<(k-1))]</span></div>
<div class="line"><a name="l00753"></a><span class="lineno"> 753</span> <span class="comment"> * = 1 * x[i + (1<<k-1)] + 0 * x[i + (1<<k) + (1<<k-1)]</span></div>
<div class="line"><a name="l00754"></a><span class="lineno"> 754</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00755"></a><span class="lineno"> 755</span>  x[i + (1 << n2) + (1 << n4)] = -x[i + (1 << n2) + (1 << n4)] >> atten;</div>
<div class="line"><a name="l00756"></a><span class="lineno"> 756</span>  x[i + (1 << n4)] = x[i + (1 << n4)] >> atten;</div>
<div class="line"><a name="l00757"></a><span class="lineno"> 757</span>  </div>
<div class="line"><a name="l00758"></a><span class="lineno"> 758</span>  <span class="comment">/* Butterflies with complex twiddle factors.</span></div>
<div class="line"><a name="l00759"></a><span class="lineno"> 759</span> <span class="comment"> * There are (1<<k-1) of them.</span></div>
<div class="line"><a name="l00760"></a><span class="lineno"> 760</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00761"></a><span class="lineno"> 761</span>  <span class="keywordflow">for</span> (j = 1; j < (1 << n4); ++j) {</div>
<div class="line"><a name="l00762"></a><span class="lineno"> 762</span>  frame_t cc, ss, t1, t2;</div>
<div class="line"><a name="l00763"></a><span class="lineno"> 763</span>  <span class="keywordtype">int</span> i1, i2, i3, i4;</div>
<div class="line"><a name="l00764"></a><span class="lineno"> 764</span> </div>
<div class="line"><a name="l00765"></a><span class="lineno"> 765</span>  i1 = i + j;</div>
<div class="line"><a name="l00766"></a><span class="lineno"> 766</span>  i2 = i + (1 << n2) - j;</div>
<div class="line"><a name="l00767"></a><span class="lineno"> 767</span>  i3 = i + (1 << n2) + j;</div>
<div class="line"><a name="l00768"></a><span class="lineno"> 768</span>  i4 = i + (1 << n2) + (1 << n2) - j;</div>
<div class="line"><a name="l00769"></a><span class="lineno"> 769</span> </div>
<div class="line"><a name="l00770"></a><span class="lineno"> 770</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00771"></a><span class="lineno"> 771</span> <span class="comment"> * cc = real(W[j * n / (1<<(k+1))])</span></div>
<div class="line"><a name="l00772"></a><span class="lineno"> 772</span> <span class="comment"> * ss = imag(W[j * n / (1<<(k+1))])</span></div>
<div class="line"><a name="l00773"></a><span class="lineno"> 773</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00774"></a><span class="lineno"> 774</span>  cc = fe->ccc[j << (m - n1)];</div>
<div class="line"><a name="l00775"></a><span class="lineno"> 775</span>  ss = fe->sss[j << (m - n1)];</div>
<div class="line"><a name="l00776"></a><span class="lineno"> 776</span> </div>
<div class="line"><a name="l00777"></a><span class="lineno"> 777</span>  <span class="comment">/* There are some symmetry properties which allow us</span></div>
<div class="line"><a name="l00778"></a><span class="lineno"> 778</span> <span class="comment"> * to get away with only four multiplications here. */</span></div>
<div class="line"><a name="l00779"></a><span class="lineno"> 779</span>  {</div>
<div class="line"><a name="l00780"></a><span class="lineno"> 780</span>  int32 tmp1, tmp2;</div>
<div class="line"><a name="l00781"></a><span class="lineno"> 781</span>  tmp1 = (int32)x[i3] * cc + (int32)x[i4] * ss;</div>
<div class="line"><a name="l00782"></a><span class="lineno"> 782</span>  tmp2 = (int32)x[i3] * ss - (int32)x[i4] * cc;</div>
<div class="line"><a name="l00783"></a><span class="lineno"> 783</span>  t1 = (int16)(tmp1 >> 15) >> atten;</div>
<div class="line"><a name="l00784"></a><span class="lineno"> 784</span>  t2 = (int16)(tmp2 >> 15) >> atten;</div>
<div class="line"><a name="l00785"></a><span class="lineno"> 785</span>  }</div>
<div class="line"><a name="l00786"></a><span class="lineno"> 786</span> </div>
<div class="line"><a name="l00787"></a><span class="lineno"> 787</span>  x[i4] = (x[i2] >> atten) - t2;</div>
<div class="line"><a name="l00788"></a><span class="lineno"> 788</span>  x[i3] = (-x[i2] >> atten) - t2;</div>
<div class="line"><a name="l00789"></a><span class="lineno"> 789</span>  x[i2] = (x[i1] >> atten) - t1;</div>
<div class="line"><a name="l00790"></a><span class="lineno"> 790</span>  x[i1] = (x[i1] >> atten) + t1;</div>
<div class="line"><a name="l00791"></a><span class="lineno"> 791</span>  }</div>
<div class="line"><a name="l00792"></a><span class="lineno"> 792</span>  }</div>
<div class="line"><a name="l00793"></a><span class="lineno"> 793</span>  }</div>
<div class="line"><a name="l00794"></a><span class="lineno"> 794</span> </div>
<div class="line"><a name="l00795"></a><span class="lineno"> 795</span>  <span class="comment">/* Return the residual scaling factor. */</span></div>
<div class="line"><a name="l00796"></a><span class="lineno"> 796</span>  <span class="keywordflow">return</span> lz;</div>
<div class="line"><a name="l00797"></a><span class="lineno"> 797</span> }</div>
<div class="line"><a name="l00798"></a><span class="lineno"> 798</span> <span class="preprocessor">#else </span><span class="comment">/* !FIXED16 */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00799"></a><span class="lineno"> 799</span> <span class="keyword">static</span> <span class="keywordtype">int</span></div>
<div class="line"><a name="l00800"></a><span class="lineno"> 800</span> fe_fft_real(<a class="code" href="structfe__s.html">fe_t</a> *fe)</div>
<div class="line"><a name="l00801"></a><span class="lineno"> 801</span> {</div>
<div class="line"><a name="l00802"></a><span class="lineno"> 802</span>  <span class="keywordtype">int</span> i, j, k, m, n;</div>
<div class="line"><a name="l00803"></a><span class="lineno"> 803</span>  frame_t *x, xt;</div>
<div class="line"><a name="l00804"></a><span class="lineno"> 804</span> </div>
<div class="line"><a name="l00805"></a><span class="lineno"> 805</span>  x = fe->frame;</div>
<div class="line"><a name="l00806"></a><span class="lineno"> 806</span>  m = fe->fft_order;</div>
<div class="line"><a name="l00807"></a><span class="lineno"> 807</span>  n = fe->fft_size;</div>
<div class="line"><a name="l00808"></a><span class="lineno"> 808</span> </div>
<div class="line"><a name="l00809"></a><span class="lineno"> 809</span>  <span class="comment">/* Bit-reverse the input. */</span></div>
<div class="line"><a name="l00810"></a><span class="lineno"> 810</span>  j = 0;</div>
<div class="line"><a name="l00811"></a><span class="lineno"> 811</span>  <span class="keywordflow">for</span> (i = 0; i < n - 1; ++i) {</div>
<div class="line"><a name="l00812"></a><span class="lineno"> 812</span>  <span class="keywordflow">if</span> (i < j) {</div>
<div class="line"><a name="l00813"></a><span class="lineno"> 813</span>  xt = x[j];</div>
<div class="line"><a name="l00814"></a><span class="lineno"> 814</span>  x[j] = x[i];</div>
<div class="line"><a name="l00815"></a><span class="lineno"> 815</span>  x[i] = xt;</div>
<div class="line"><a name="l00816"></a><span class="lineno"> 816</span>  }</div>
<div class="line"><a name="l00817"></a><span class="lineno"> 817</span>  k = n / 2;</div>
<div class="line"><a name="l00818"></a><span class="lineno"> 818</span>  <span class="keywordflow">while</span> (k <= j) {</div>
<div class="line"><a name="l00819"></a><span class="lineno"> 819</span>  j -= k;</div>
<div class="line"><a name="l00820"></a><span class="lineno"> 820</span>  k /= 2;</div>
<div class="line"><a name="l00821"></a><span class="lineno"> 821</span>  }</div>
<div class="line"><a name="l00822"></a><span class="lineno"> 822</span>  j += k;</div>
<div class="line"><a name="l00823"></a><span class="lineno"> 823</span>  }</div>
<div class="line"><a name="l00824"></a><span class="lineno"> 824</span> </div>
<div class="line"><a name="l00825"></a><span class="lineno"> 825</span>  <span class="comment">/* Basic butterflies (2-point FFT, real twiddle factors):</span></div>
<div class="line"><a name="l00826"></a><span class="lineno"> 826</span> <span class="comment"> * x[i] = x[i] + 1 * x[i+1]</span></div>
<div class="line"><a name="l00827"></a><span class="lineno"> 827</span> <span class="comment"> * x[i+1] = x[i] + -1 * x[i+1]</span></div>
<div class="line"><a name="l00828"></a><span class="lineno"> 828</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00829"></a><span class="lineno"> 829</span>  <span class="keywordflow">for</span> (i = 0; i < n; i += 2) {</div>
<div class="line"><a name="l00830"></a><span class="lineno"> 830</span>  xt = x[i];</div>
<div class="line"><a name="l00831"></a><span class="lineno"> 831</span>  x[i] = (xt + x[i + 1]);</div>
<div class="line"><a name="l00832"></a><span class="lineno"> 832</span>  x[i + 1] = (xt - x[i + 1]);</div>
<div class="line"><a name="l00833"></a><span class="lineno"> 833</span>  }</div>
<div class="line"><a name="l00834"></a><span class="lineno"> 834</span> </div>
<div class="line"><a name="l00835"></a><span class="lineno"> 835</span>  <span class="comment">/* The rest of the butterflies, in stages from 1..m */</span></div>
<div class="line"><a name="l00836"></a><span class="lineno"> 836</span>  <span class="keywordflow">for</span> (k = 1; k < m; ++k) {</div>
<div class="line"><a name="l00837"></a><span class="lineno"> 837</span>  <span class="keywordtype">int</span> n1, n2, n4;</div>
<div class="line"><a name="l00838"></a><span class="lineno"> 838</span> </div>
<div class="line"><a name="l00839"></a><span class="lineno"> 839</span>  n4 = k - 1;</div>
<div class="line"><a name="l00840"></a><span class="lineno"> 840</span>  n2 = k;</div>
<div class="line"><a name="l00841"></a><span class="lineno"> 841</span>  n1 = k + 1;</div>
<div class="line"><a name="l00842"></a><span class="lineno"> 842</span>  <span class="comment">/* Stride over each (1 << (k+1)) points */</span></div>
<div class="line"><a name="l00843"></a><span class="lineno"> 843</span>  <span class="keywordflow">for</span> (i = 0; i < n; i += (1 << n1)) {</div>
<div class="line"><a name="l00844"></a><span class="lineno"> 844</span>  <span class="comment">/* Basic butterfly with real twiddle factors:</span></div>
<div class="line"><a name="l00845"></a><span class="lineno"> 845</span> <span class="comment"> * x[i] = x[i] + 1 * x[i + (1<<k)]</span></div>
<div class="line"><a name="l00846"></a><span class="lineno"> 846</span> <span class="comment"> * x[i + (1<<k)] = x[i] + -1 * x[i + (1<<k)]</span></div>
<div class="line"><a name="l00847"></a><span class="lineno"> 847</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00848"></a><span class="lineno"> 848</span>  xt = x[i];</div>
<div class="line"><a name="l00849"></a><span class="lineno"> 849</span>  x[i] = (xt + x[i + (1 << n2)]);</div>
<div class="line"><a name="l00850"></a><span class="lineno"> 850</span>  x[i + (1 << n2)] = (xt - x[i + (1 << n2)]);</div>
<div class="line"><a name="l00851"></a><span class="lineno"> 851</span> </div>
<div class="line"><a name="l00852"></a><span class="lineno"> 852</span>  <span class="comment">/* The other ones with real twiddle factors:</span></div>
<div class="line"><a name="l00853"></a><span class="lineno"> 853</span> <span class="comment"> * x[i + (1<<k) + (1<<(k-1))]</span></div>
<div class="line"><a name="l00854"></a><span class="lineno"> 854</span> <span class="comment"> * = 0 * x[i + (1<<k-1)] + -1 * x[i + (1<<k) + (1<<k-1)]</span></div>
<div class="line"><a name="l00855"></a><span class="lineno"> 855</span> <span class="comment"> * x[i + (1<<(k-1))]</span></div>
<div class="line"><a name="l00856"></a><span class="lineno"> 856</span> <span class="comment"> * = 1 * x[i + (1<<k-1)] + 0 * x[i + (1<<k) + (1<<k-1)]</span></div>
<div class="line"><a name="l00857"></a><span class="lineno"> 857</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00858"></a><span class="lineno"> 858</span>  x[i + (1 << n2) + (1 << n4)] = -x[i + (1 << n2) + (1 << n4)];</div>
<div class="line"><a name="l00859"></a><span class="lineno"> 859</span>  x[i + (1 << n4)] = x[i + (1 << n4)];</div>
<div class="line"><a name="l00860"></a><span class="lineno"> 860</span>  </div>
<div class="line"><a name="l00861"></a><span class="lineno"> 861</span>  <span class="comment">/* Butterflies with complex twiddle factors.</span></div>
<div class="line"><a name="l00862"></a><span class="lineno"> 862</span> <span class="comment"> * There are (1<<k-1) of them.</span></div>
<div class="line"><a name="l00863"></a><span class="lineno"> 863</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00864"></a><span class="lineno"> 864</span>  <span class="keywordflow">for</span> (j = 1; j < (1 << n4); ++j) {</div>
<div class="line"><a name="l00865"></a><span class="lineno"> 865</span>  frame_t cc, ss, t1, t2;</div>
<div class="line"><a name="l00866"></a><span class="lineno"> 866</span>  <span class="keywordtype">int</span> i1, i2, i3, i4;</div>
<div class="line"><a name="l00867"></a><span class="lineno"> 867</span> </div>
<div class="line"><a name="l00868"></a><span class="lineno"> 868</span>  i1 = i + j;</div>
<div class="line"><a name="l00869"></a><span class="lineno"> 869</span>  i2 = i + (1 << n2) - j;</div>
<div class="line"><a name="l00870"></a><span class="lineno"> 870</span>  i3 = i + (1 << n2) + j;</div>
<div class="line"><a name="l00871"></a><span class="lineno"> 871</span>  i4 = i + (1 << n2) + (1 << n2) - j;</div>
<div class="line"><a name="l00872"></a><span class="lineno"> 872</span> </div>
<div class="line"><a name="l00873"></a><span class="lineno"> 873</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00874"></a><span class="lineno"> 874</span> <span class="comment"> * cc = real(W[j * n / (1<<(k+1))])</span></div>
<div class="line"><a name="l00875"></a><span class="lineno"> 875</span> <span class="comment"> * ss = imag(W[j * n / (1<<(k+1))])</span></div>
<div class="line"><a name="l00876"></a><span class="lineno"> 876</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00877"></a><span class="lineno"> 877</span>  cc = fe->ccc[j << (m - n1)];</div>
<div class="line"><a name="l00878"></a><span class="lineno"> 878</span>  ss = fe->sss[j << (m - n1)];</div>
<div class="line"><a name="l00879"></a><span class="lineno"> 879</span> </div>
<div class="line"><a name="l00880"></a><span class="lineno"> 880</span>  <span class="comment">/* There are some symmetry properties which allow us</span></div>
<div class="line"><a name="l00881"></a><span class="lineno"> 881</span> <span class="comment"> * to get away with only four multiplications here. */</span></div>
<div class="line"><a name="l00882"></a><span class="lineno"> 882</span>  t1 = COSMUL(x[i3], cc) + COSMUL(x[i4], ss);</div>
<div class="line"><a name="l00883"></a><span class="lineno"> 883</span>  t2 = COSMUL(x[i3], ss) - COSMUL(x[i4], cc);</div>
<div class="line"><a name="l00884"></a><span class="lineno"> 884</span> </div>
<div class="line"><a name="l00885"></a><span class="lineno"> 885</span>  x[i4] = (x[i2] - t2);</div>
<div class="line"><a name="l00886"></a><span class="lineno"> 886</span>  x[i3] = (-x[i2] - t2);</div>
<div class="line"><a name="l00887"></a><span class="lineno"> 887</span>  x[i2] = (x[i1] - t1);</div>
<div class="line"><a name="l00888"></a><span class="lineno"> 888</span>  x[i1] = (x[i1] + t1);</div>
<div class="line"><a name="l00889"></a><span class="lineno"> 889</span>  }</div>
<div class="line"><a name="l00890"></a><span class="lineno"> 890</span>  }</div>
<div class="line"><a name="l00891"></a><span class="lineno"> 891</span>  }</div>
<div class="line"><a name="l00892"></a><span class="lineno"> 892</span> </div>
<div class="line"><a name="l00893"></a><span class="lineno"> 893</span>  <span class="comment">/* This isn't used, but return it for completeness. */</span></div>
<div class="line"><a name="l00894"></a><span class="lineno"> 894</span>  <span class="keywordflow">return</span> m;</div>
<div class="line"><a name="l00895"></a><span class="lineno"> 895</span> }</div>
<div class="line"><a name="l00896"></a><span class="lineno"> 896</span> <span class="preprocessor">#endif </span><span class="comment">/* !FIXED16 */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00897"></a><span class="lineno"> 897</span> </div>
<div class="line"><a name="l00898"></a><span class="lineno"> 898</span> <span class="keyword">static</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00899"></a><span class="lineno"> 899</span> fe_spec_magnitude(<a class="code" href="structfe__s.html">fe_t</a> *fe)</div>
<div class="line"><a name="l00900"></a><span class="lineno"> 900</span> {</div>
<div class="line"><a name="l00901"></a><span class="lineno"> 901</span>  frame_t *fft;</div>
<div class="line"><a name="l00902"></a><span class="lineno"> 902</span>  powspec_t *spec;</div>
<div class="line"><a name="l00903"></a><span class="lineno"> 903</span>  int32 j, scale, fftsize;</div>
<div class="line"><a name="l00904"></a><span class="lineno"> 904</span> </div>
<div class="line"><a name="l00905"></a><span class="lineno"> 905</span>  <span class="comment">/* Do FFT and get the scaling factor back (only actually used in</span></div>
<div class="line"><a name="l00906"></a><span class="lineno"> 906</span> <span class="comment"> * fixed-point). Note the scaling factor is expressed in bits. */</span></div>
<div class="line"><a name="l00907"></a><span class="lineno"> 907</span>  scale = fe_fft_real(fe);</div>
<div class="line"><a name="l00908"></a><span class="lineno"> 908</span> </div>
<div class="line"><a name="l00909"></a><span class="lineno"> 909</span>  <span class="comment">/* Convenience pointers to make things less awkward below. */</span></div>
<div class="line"><a name="l00910"></a><span class="lineno"> 910</span>  fft = fe->frame;</div>
<div class="line"><a name="l00911"></a><span class="lineno"> 911</span>  spec = fe->spec;</div>
<div class="line"><a name="l00912"></a><span class="lineno"> 912</span>  fftsize = fe->fft_size;</div>
<div class="line"><a name="l00913"></a><span class="lineno"> 913</span> </div>
<div class="line"><a name="l00914"></a><span class="lineno"> 914</span>  <span class="comment">/* We need to scale things up the rest of the way to N. */</span></div>
<div class="line"><a name="l00915"></a><span class="lineno"> 915</span>  scale = fe->fft_order - scale;</div>
<div class="line"><a name="l00916"></a><span class="lineno"> 916</span> </div>
<div class="line"><a name="l00917"></a><span class="lineno"> 917</span>  <span class="comment">/* The first point (DC coefficient) has no imaginary part */</span></div>
<div class="line"><a name="l00918"></a><span class="lineno"> 918</span>  {</div>
<div class="line"><a name="l00919"></a><span class="lineno"> 919</span> <span class="preprocessor">#ifdef FIXED16</span></div>
<div class="line"><a name="l00920"></a><span class="lineno"> 920</span>  spec[0] = fixlog(abs(fft[0]) << scale) * 2;</div>
<div class="line"><a name="l00921"></a><span class="lineno"> 921</span> <span class="preprocessor">#elif defined(FIXED_POINT)</span></div>
<div class="line"><a name="l00922"></a><span class="lineno"> 922</span>  spec[0] = FIXLN(abs(fft[0]) << scale) * 2;</div>
<div class="line"><a name="l00923"></a><span class="lineno"> 923</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00924"></a><span class="lineno"> 924</span>  spec[0] = fft[0] * fft[0];</div>
<div class="line"><a name="l00925"></a><span class="lineno"> 925</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00926"></a><span class="lineno"> 926</span>  }</div>
<div class="line"><a name="l00927"></a><span class="lineno"> 927</span> </div>
<div class="line"><a name="l00928"></a><span class="lineno"> 928</span>  <span class="keywordflow">for</span> (j = 1; j <= fftsize / 2; j++) {</div>
<div class="line"><a name="l00929"></a><span class="lineno"> 929</span> <span class="preprocessor">#ifdef FIXED16</span></div>
<div class="line"><a name="l00930"></a><span class="lineno"> 930</span>  int32 rr = fixlog(abs(fft[j]) << scale) * 2;</div>
<div class="line"><a name="l00931"></a><span class="lineno"> 931</span>  int32 ii = fixlog(abs(fft[fftsize - j]) << scale) * 2;</div>
<div class="line"><a name="l00932"></a><span class="lineno"> 932</span>  spec[j] = fe_log_add(rr, ii);</div>
<div class="line"><a name="l00933"></a><span class="lineno"> 933</span> <span class="preprocessor">#elif defined(FIXED_POINT)</span></div>
<div class="line"><a name="l00934"></a><span class="lineno"> 934</span>  int32 rr = FIXLN(abs(fft[j]) << scale) * 2;</div>
<div class="line"><a name="l00935"></a><span class="lineno"> 935</span>  int32 ii = FIXLN(abs(fft[fftsize - j]) << scale) * 2;</div>
<div class="line"><a name="l00936"></a><span class="lineno"> 936</span>  spec[j] = fe_log_add(rr, ii);</div>
<div class="line"><a name="l00937"></a><span class="lineno"> 937</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00938"></a><span class="lineno"> 938</span>  spec[j] = fft[j] * fft[j] + fft[fftsize - j] * fft[fftsize - j];</div>
<div class="line"><a name="l00939"></a><span class="lineno"> 939</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00940"></a><span class="lineno"> 940</span>  }</div>
<div class="line"><a name="l00941"></a><span class="lineno"> 941</span> }</div>
<div class="line"><a name="l00942"></a><span class="lineno"> 942</span> </div>
<div class="line"><a name="l00943"></a><span class="lineno"> 943</span> <span class="keyword">static</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00944"></a><span class="lineno"> 944</span> fe_mel_spec(<a class="code" href="structfe__s.html">fe_t</a> * fe)</div>
<div class="line"><a name="l00945"></a><span class="lineno"> 945</span> {</div>
<div class="line"><a name="l00946"></a><span class="lineno"> 946</span>  <span class="keywordtype">int</span> whichfilt;</div>
<div class="line"><a name="l00947"></a><span class="lineno"> 947</span>  powspec_t *spec, *mfspec;</div>
<div class="line"><a name="l00948"></a><span class="lineno"> 948</span> </div>
<div class="line"><a name="l00949"></a><span class="lineno"> 949</span>  <span class="comment">/* Convenience poitners. */</span></div>
<div class="line"><a name="l00950"></a><span class="lineno"> 950</span>  spec = fe->spec;</div>
<div class="line"><a name="l00951"></a><span class="lineno"> 951</span>  mfspec = fe->mfspec;</div>
<div class="line"><a name="l00952"></a><span class="lineno"> 952</span> </div>
<div class="line"><a name="l00953"></a><span class="lineno"> 953</span>  <span class="keywordflow">for</span> (whichfilt = 0; whichfilt < fe->mel_fb->num_filters; whichfilt++) {</div>
<div class="line"><a name="l00954"></a><span class="lineno"> 954</span>  <span class="keywordtype">int</span> spec_start, filt_start, i;</div>
<div class="line"><a name="l00955"></a><span class="lineno"> 955</span> </div>
<div class="line"><a name="l00956"></a><span class="lineno"> 956</span>  spec_start = fe->mel_fb->spec_start[whichfilt];</div>
<div class="line"><a name="l00957"></a><span class="lineno"> 957</span>  filt_start = fe->mel_fb->filt_start[whichfilt];</div>
<div class="line"><a name="l00958"></a><span class="lineno"> 958</span> </div>
<div class="line"><a name="l00959"></a><span class="lineno"> 959</span> <span class="preprocessor">#ifdef FIXED_POINT</span></div>
<div class="line"><a name="l00960"></a><span class="lineno"> 960</span>  mfspec[whichfilt] = spec[spec_start] + fe->mel_fb->filt_coeffs[filt_start];</div>
<div class="line"><a name="l00961"></a><span class="lineno"> 961</span>  <span class="keywordflow">for</span> (i = 1; i < fe->mel_fb->filt_width[whichfilt]; i++) {</div>
<div class="line"><a name="l00962"></a><span class="lineno"> 962</span>  mfspec[whichfilt] = fe_log_add(mfspec[whichfilt],</div>
<div class="line"><a name="l00963"></a><span class="lineno"> 963</span>  spec[spec_start + i] +</div>
<div class="line"><a name="l00964"></a><span class="lineno"> 964</span>  fe->mel_fb->filt_coeffs[filt_start + i]);</div>
<div class="line"><a name="l00965"></a><span class="lineno"> 965</span>  }</div>
<div class="line"><a name="l00966"></a><span class="lineno"> 966</span> <span class="preprocessor">#else </span><span class="comment">/* !FIXED_POINT */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00967"></a><span class="lineno"> 967</span>  mfspec[whichfilt] = 0;</div>
<div class="line"><a name="l00968"></a><span class="lineno"> 968</span>  <span class="keywordflow">for</span> (i = 0; i < fe->mel_fb->filt_width[whichfilt]; i++)</div>
<div class="line"><a name="l00969"></a><span class="lineno"> 969</span>  mfspec[whichfilt] +=</div>
<div class="line"><a name="l00970"></a><span class="lineno"> 970</span>  spec[spec_start + i] * fe->mel_fb->filt_coeffs[filt_start + i];</div>
<div class="line"><a name="l00971"></a><span class="lineno"> 971</span> #endif <span class="comment">/* !FIXED_POINT */</span></div>
<div class="line"><a name="l00972"></a><span class="lineno"> 972</span>  }</div>
<div class="line"><a name="l00973"></a><span class="lineno"> 973</span> }</div>
<div class="line"><a name="l00974"></a><span class="lineno"> 974</span> </div>
<div class="line"><a name="l00975"></a><span class="lineno"> 975</span> <span class="keyword">static</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00976"></a><span class="lineno"> 976</span> fe_mel_cep(<a class="code" href="structfe__s.html">fe_t</a> * fe, mfcc_t *mfcep)</div>
<div class="line"><a name="l00977"></a><span class="lineno"> 977</span> {</div>
<div class="line"><a name="l00978"></a><span class="lineno"> 978</span>  int32 i;</div>
<div class="line"><a name="l00979"></a><span class="lineno"> 979</span>  powspec_t *mfspec;</div>
<div class="line"><a name="l00980"></a><span class="lineno"> 980</span> </div>
<div class="line"><a name="l00981"></a><span class="lineno"> 981</span>  <span class="comment">/* Convenience pointer. */</span></div>
<div class="line"><a name="l00982"></a><span class="lineno"> 982</span>  mfspec = fe->mfspec;</div>
<div class="line"><a name="l00983"></a><span class="lineno"> 983</span> </div>
<div class="line"><a name="l00984"></a><span class="lineno"> 984</span>  <span class="keywordflow">for</span> (i = 0; i < fe->mel_fb->num_filters; ++i) {</div>
<div class="line"><a name="l00985"></a><span class="lineno"> 985</span> <span class="preprocessor">#ifndef FIXED_POINT </span><span class="comment">/* It's already in log domain for fixed point */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00986"></a><span class="lineno"> 986</span>  <span class="keywordflow">if</span> (mfspec[i] > 0)</div>
<div class="line"><a name="l00987"></a><span class="lineno"> 987</span>  mfspec[i] = log(mfspec[i]);</div>
<div class="line"><a name="l00988"></a><span class="lineno"> 988</span>  <span class="keywordflow">else</span> <span class="comment">/* This number should be smaller than anything</span></div>
<div class="line"><a name="l00989"></a><span class="lineno"> 989</span> <span class="comment"> * else, but not too small, so as to avoid</span></div>
<div class="line"><a name="l00990"></a><span class="lineno"> 990</span> <span class="comment"> * infinities in the inverse transform (this is</span></div>
<div class="line"><a name="l00991"></a><span class="lineno"> 991</span> <span class="comment"> * the frequency-domain equivalent of</span></div>
<div class="line"><a name="l00992"></a><span class="lineno"> 992</span> <span class="comment"> * dithering) */</span></div>
<div class="line"><a name="l00993"></a><span class="lineno"> 993</span>  mfspec[i] = -10.0;</div>
<div class="line"><a name="l00994"></a><span class="lineno"> 994</span> <span class="preprocessor">#endif </span><span class="comment">/* !FIXED_POINT */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00995"></a><span class="lineno"> 995</span>  }</div>
<div class="line"><a name="l00996"></a><span class="lineno"> 996</span> </div>
<div class="line"><a name="l00997"></a><span class="lineno"> 997</span>  <span class="comment">/* If we are doing LOG_SPEC, then do nothing. */</span></div>
<div class="line"><a name="l00998"></a><span class="lineno"> 998</span>  <span class="keywordflow">if</span> (fe->log_spec == RAW_LOG_SPEC) {</div>
<div class="line"><a name="l00999"></a><span class="lineno"> 999</span>  <span class="keywordflow">for</span> (i = 0; i < fe->feature_dimension; i++) {</div>
<div class="line"><a name="l01000"></a><span class="lineno"> 1000</span>  mfcep[i] = (mfcc_t) mfspec[i];</div>
<div class="line"><a name="l01001"></a><span class="lineno"> 1001</span>  }</div>
<div class="line"><a name="l01002"></a><span class="lineno"> 1002</span>  }</div>
<div class="line"><a name="l01003"></a><span class="lineno"> 1003</span>  <span class="comment">/* For smoothed spectrum, do DCT-II followed by (its inverse) DCT-III */</span></div>
<div class="line"><a name="l01004"></a><span class="lineno"> 1004</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (fe->log_spec == SMOOTH_LOG_SPEC) {</div>
<div class="line"><a name="l01005"></a><span class="lineno"> 1005</span>  <span class="comment">/* FIXME: This is probably broken for fixed-point. */</span></div>
<div class="line"><a name="l01006"></a><span class="lineno"> 1006</span>  fe_dct2(fe, mfspec, mfcep, 0);</div>
<div class="line"><a name="l01007"></a><span class="lineno"> 1007</span>  fe_dct3(fe, mfcep, mfspec);</div>
<div class="line"><a name="l01008"></a><span class="lineno"> 1008</span>  <span class="keywordflow">for</span> (i = 0; i < fe->feature_dimension; i++) {</div>
<div class="line"><a name="l01009"></a><span class="lineno"> 1009</span>  mfcep[i] = (mfcc_t) mfspec[i];</div>
<div class="line"><a name="l01010"></a><span class="lineno"> 1010</span>  }</div>
<div class="line"><a name="l01011"></a><span class="lineno"> 1011</span>  }</div>
<div class="line"><a name="l01012"></a><span class="lineno"> 1012</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (fe->transform == DCT_II)</div>
<div class="line"><a name="l01013"></a><span class="lineno"> 1013</span>  fe_dct2(fe, mfspec, mfcep, FALSE);</div>
<div class="line"><a name="l01014"></a><span class="lineno"> 1014</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (fe->transform == DCT_HTK)</div>
<div class="line"><a name="l01015"></a><span class="lineno"> 1015</span>  fe_dct2(fe, mfspec, mfcep, TRUE);</div>
<div class="line"><a name="l01016"></a><span class="lineno"> 1016</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l01017"></a><span class="lineno"> 1017</span>  fe_spec2cep(fe, mfspec, mfcep);</div>
<div class="line"><a name="l01018"></a><span class="lineno"> 1018</span> </div>
<div class="line"><a name="l01019"></a><span class="lineno"> 1019</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l01020"></a><span class="lineno"> 1020</span> }</div>
<div class="line"><a name="l01021"></a><span class="lineno"> 1021</span> </div>
<div class="line"><a name="l01022"></a><span class="lineno"> 1022</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l01023"></a><span class="lineno"> 1023</span> fe_spec2cep(<a class="code" href="structfe__s.html">fe_t</a> * fe, <span class="keyword">const</span> powspec_t * mflogspec, mfcc_t * mfcep)</div>
<div class="line"><a name="l01024"></a><span class="lineno"> 1024</span> {</div>
<div class="line"><a name="l01025"></a><span class="lineno"> 1025</span>  int32 i, j, beta;</div>
<div class="line"><a name="l01026"></a><span class="lineno"> 1026</span> </div>
<div class="line"><a name="l01027"></a><span class="lineno"> 1027</span>  <span class="comment">/* Compute C0 separately (its basis vector is 1) to avoid</span></div>
<div class="line"><a name="l01028"></a><span class="lineno"> 1028</span> <span class="comment"> * costly multiplications. */</span></div>
<div class="line"><a name="l01029"></a><span class="lineno"> 1029</span>  mfcep[0] = mflogspec[0] / 2; <span class="comment">/* beta = 0.5 */</span></div>
<div class="line"><a name="l01030"></a><span class="lineno"> 1030</span>  <span class="keywordflow">for</span> (j = 1; j < fe->mel_fb->num_filters; j++)</div>
<div class="line"><a name="l01031"></a><span class="lineno"> 1031</span>  mfcep[0] += mflogspec[j]; <span class="comment">/* beta = 1.0 */</span></div>
<div class="line"><a name="l01032"></a><span class="lineno"> 1032</span>  mfcep[0] /= (frame_t) fe->mel_fb->num_filters;</div>
<div class="line"><a name="l01033"></a><span class="lineno"> 1033</span> </div>
<div class="line"><a name="l01034"></a><span class="lineno"> 1034</span>  for (i = 1; i < fe->num_cepstra; ++i) {</div>
<div class="line"><a name="l01035"></a><span class="lineno"> 1035</span>  mfcep[i] = 0;</div>
<div class="line"><a name="l01036"></a><span class="lineno"> 1036</span>  <span class="keywordflow">for</span> (j = 0; j < fe->mel_fb->num_filters; j++) {</div>
<div class="line"><a name="l01037"></a><span class="lineno"> 1037</span>  <span class="keywordflow">if</span> (j == 0)</div>
<div class="line"><a name="l01038"></a><span class="lineno"> 1038</span>  beta = 1; <span class="comment">/* 0.5 */</span></div>
<div class="line"><a name="l01039"></a><span class="lineno"> 1039</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l01040"></a><span class="lineno"> 1040</span>  beta = 2; <span class="comment">/* 1.0 */</span></div>
<div class="line"><a name="l01041"></a><span class="lineno"> 1041</span>  mfcep[i] += COSMUL(mflogspec[j],</div>
<div class="line"><a name="l01042"></a><span class="lineno"> 1042</span>  fe->mel_fb->mel_cosine[i][j]) * beta;</div>
<div class="line"><a name="l01043"></a><span class="lineno"> 1043</span>  }</div>
<div class="line"><a name="l01044"></a><span class="lineno"> 1044</span>  <span class="comment">/* Note that this actually normalizes by num_filters, like the</span></div>
<div class="line"><a name="l01045"></a><span class="lineno"> 1045</span> <span class="comment"> * original Sphinx front-end, due to the doubled 'beta' factor</span></div>
<div class="line"><a name="l01046"></a><span class="lineno"> 1046</span> <span class="comment"> * above. */</span></div>
<div class="line"><a name="l01047"></a><span class="lineno"> 1047</span>  mfcep[i] /= (frame_t) fe->mel_fb->num_filters * 2;</div>
<div class="line"><a name="l01048"></a><span class="lineno"> 1048</span>  }</div>
<div class="line"><a name="l01049"></a><span class="lineno"> 1049</span> }</div>
<div class="line"><a name="l01050"></a><span class="lineno"> 1050</span> </div>
<div class="line"><a name="l01051"></a><span class="lineno"> 1051</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l01052"></a><span class="lineno"> 1052</span> fe_dct2(<a class="code" href="structfe__s.html">fe_t</a> * fe, <span class="keyword">const</span> powspec_t * mflogspec, mfcc_t * mfcep, <span class="keywordtype">int</span> htk)</div>
<div class="line"><a name="l01053"></a><span class="lineno"> 1053</span> {</div>
<div class="line"><a name="l01054"></a><span class="lineno"> 1054</span>  int32 i, j;</div>
<div class="line"><a name="l01055"></a><span class="lineno"> 1055</span> </div>
<div class="line"><a name="l01056"></a><span class="lineno"> 1056</span>  <span class="comment">/* Compute C0 separately (its basis vector is 1) to avoid</span></div>
<div class="line"><a name="l01057"></a><span class="lineno"> 1057</span> <span class="comment"> * costly multiplications. */</span></div>
<div class="line"><a name="l01058"></a><span class="lineno"> 1058</span>  mfcep[0] = mflogspec[0];</div>
<div class="line"><a name="l01059"></a><span class="lineno"> 1059</span>  <span class="keywordflow">for</span> (j = 1; j < fe->mel_fb->num_filters; j++)</div>
<div class="line"><a name="l01060"></a><span class="lineno"> 1060</span>  mfcep[0] += mflogspec[j];</div>
<div class="line"><a name="l01061"></a><span class="lineno"> 1061</span>  <span class="keywordflow">if</span> (htk)</div>
<div class="line"><a name="l01062"></a><span class="lineno"> 1062</span>  mfcep[0] = COSMUL(mfcep[0], fe->mel_fb->sqrt_inv_2n);</div>
<div class="line"><a name="l01063"></a><span class="lineno"> 1063</span>  <span class="keywordflow">else</span> <span class="comment">/* sqrt(1/N) = sqrt(2/N) * 1/sqrt(2) */</span></div>
<div class="line"><a name="l01064"></a><span class="lineno"> 1064</span>  mfcep[0] = COSMUL(mfcep[0], fe->mel_fb->sqrt_inv_n);</div>
<div class="line"><a name="l01065"></a><span class="lineno"> 1065</span> </div>
<div class="line"><a name="l01066"></a><span class="lineno"> 1066</span>  <span class="keywordflow">for</span> (i = 1; i < fe->num_cepstra; ++i) {</div>
<div class="line"><a name="l01067"></a><span class="lineno"> 1067</span>  mfcep[i] = 0;</div>
<div class="line"><a name="l01068"></a><span class="lineno"> 1068</span>  <span class="keywordflow">for</span> (j = 0; j < fe->mel_fb->num_filters; j++) {</div>
<div class="line"><a name="l01069"></a><span class="lineno"> 1069</span>  mfcep[i] += COSMUL(mflogspec[j],</div>
<div class="line"><a name="l01070"></a><span class="lineno"> 1070</span>  fe->mel_fb->mel_cosine[i][j]);</div>
<div class="line"><a name="l01071"></a><span class="lineno"> 1071</span>  }</div>
<div class="line"><a name="l01072"></a><span class="lineno"> 1072</span>  mfcep[i] = COSMUL(mfcep[i], fe->mel_fb->sqrt_inv_2n);</div>
<div class="line"><a name="l01073"></a><span class="lineno"> 1073</span>  }</div>
<div class="line"><a name="l01074"></a><span class="lineno"> 1074</span> }</div>
<div class="line"><a name="l01075"></a><span class="lineno"> 1075</span> </div>
<div class="line"><a name="l01076"></a><span class="lineno"> 1076</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l01077"></a><span class="lineno"> 1077</span> fe_lifter(<a class="code" href="structfe__s.html">fe_t</a> *fe, mfcc_t *mfcep)</div>
<div class="line"><a name="l01078"></a><span class="lineno"> 1078</span> {</div>
<div class="line"><a name="l01079"></a><span class="lineno"> 1079</span>  int32 i;</div>
<div class="line"><a name="l01080"></a><span class="lineno"> 1080</span> </div>
<div class="line"><a name="l01081"></a><span class="lineno"> 1081</span>  <span class="keywordflow">if</span> (fe->mel_fb->lifter_val == 0)</div>
<div class="line"><a name="l01082"></a><span class="lineno"> 1082</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l01083"></a><span class="lineno"> 1083</span> </div>
<div class="line"><a name="l01084"></a><span class="lineno"> 1084</span>  <span class="keywordflow">for</span> (i = 0; i < fe->num_cepstra; ++i) {</div>
<div class="line"><a name="l01085"></a><span class="lineno"> 1085</span>  mfcep[i] = MFCCMUL(mfcep[i], fe->mel_fb->lifter[i]);</div>
<div class="line"><a name="l01086"></a><span class="lineno"> 1086</span>  }</div>
<div class="line"><a name="l01087"></a><span class="lineno"> 1087</span> }</div>
<div class="line"><a name="l01088"></a><span class="lineno"> 1088</span> </div>
<div class="line"><a name="l01089"></a><span class="lineno"> 1089</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l01090"></a><span class="lineno"> 1090</span> fe_dct3(<a class="code" href="structfe__s.html">fe_t</a> * fe, <span class="keyword">const</span> mfcc_t * mfcep, powspec_t * mflogspec)</div>
<div class="line"><a name="l01091"></a><span class="lineno"> 1091</span> {</div>
<div class="line"><a name="l01092"></a><span class="lineno"> 1092</span>  int32 i, j;</div>
<div class="line"><a name="l01093"></a><span class="lineno"> 1093</span> </div>
<div class="line"><a name="l01094"></a><span class="lineno"> 1094</span>  <span class="keywordflow">for</span> (i = 0; i < fe->mel_fb->num_filters; ++i) {</div>
<div class="line"><a name="l01095"></a><span class="lineno"> 1095</span>  mflogspec[i] = COSMUL(mfcep[0], SQRT_HALF);</div>
<div class="line"><a name="l01096"></a><span class="lineno"> 1096</span>  <span class="keywordflow">for</span> (j = 1; j < fe->num_cepstra; j++) {</div>
<div class="line"><a name="l01097"></a><span class="lineno"> 1097</span>  mflogspec[i] += COSMUL(mfcep[j],</div>
<div class="line"><a name="l01098"></a><span class="lineno"> 1098</span>  fe->mel_fb->mel_cosine[j][i]);</div>
<div class="line"><a name="l01099"></a><span class="lineno"> 1099</span>  }</div>
<div class="line"><a name="l01100"></a><span class="lineno"> 1100</span>  mflogspec[i] = COSMUL(mflogspec[i], fe->mel_fb->sqrt_inv_2n);</div>
<div class="line"><a name="l01101"></a><span class="lineno"> 1101</span>  }</div>
<div class="line"><a name="l01102"></a><span class="lineno"> 1102</span> }</div>
<div class="line"><a name="l01103"></a><span class="lineno"> 1103</span> </div>
<div class="line"><a name="l01104"></a><span class="lineno"> 1104</span> int32</div>
<div class="line"><a name="l01105"></a><span class="lineno"> 1105</span> fe_write_frame(<a class="code" href="structfe__s.html">fe_t</a> * fe, mfcc_t * fea)</div>
<div class="line"><a name="l01106"></a><span class="lineno"> 1106</span> {</div>
<div class="line"><a name="l01107"></a><span class="lineno"> 1107</span>  fe_spec_magnitude(fe);</div>
<div class="line"><a name="l01108"></a><span class="lineno"> 1108</span>  fe_mel_spec(fe);</div>
<div class="line"><a name="l01109"></a><span class="lineno"> 1109</span>  fe_mel_cep(fe, fea);</div>
<div class="line"><a name="l01110"></a><span class="lineno"> 1110</span>  fe_lifter(fe, fea);</div>
<div class="line"><a name="l01111"></a><span class="lineno"> 1111</span> </div>
<div class="line"><a name="l01112"></a><span class="lineno"> 1112</span>  <span class="keywordflow">return</span> 1;</div>
<div class="line"><a name="l01113"></a><span class="lineno"> 1113</span> }</div>
<div class="line"><a name="l01114"></a><span class="lineno"> 1114</span> </div>
<div class="line"><a name="l01115"></a><span class="lineno"> 1115</span> <span class="keywordtype">void</span> *</div>
<div class="line"><a name="l01116"></a><span class="lineno"> 1116</span> fe_create_2d(int32 d1, int32 d2, int32 elem_size)</div>
<div class="line"><a name="l01117"></a><span class="lineno"> 1117</span> {</div>
<div class="line"><a name="l01118"></a><span class="lineno"> 1118</span>  <span class="keywordflow">return</span> (<span class="keywordtype">void</span> *)<a class="code" href="ckd__alloc_8h.html#a949e7b50fcd9697b1563fa57f50e9c4f">ckd_calloc_2d</a>(d1, d2, elem_size);</div>
<div class="line"><a name="l01119"></a><span class="lineno"> 1119</span> }</div>
<div class="line"><a name="l01120"></a><span class="lineno"> 1120</span> </div>
<div class="line"><a name="l01121"></a><span class="lineno"> 1121</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l01122"></a><span class="lineno"> 1122</span> fe_free_2d(<span class="keywordtype">void</span> *arr)</div>
<div class="line"><a name="l01123"></a><span class="lineno"> 1123</span> {</div>
<div class="line"><a name="l01124"></a><span class="lineno"> 1124</span>  <a class="code" href="ckd__alloc_8h.html#a8246c071ac12e98b7e1df9fe6da15aef">ckd_free_2d</a>((<span class="keywordtype">void</span> **)arr);</div>
<div class="line"><a name="l01125"></a><span class="lineno"> 1125</span> }</div>
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<div class="ttc" id="ckd__alloc_8h_html_a8e89a31c3c70710a8e023a177084bff2"><div class="ttname"><a href="ckd__alloc_8h.html#a8e89a31c3c70710a8e023a177084bff2">ckd_malloc</a></div><div class="ttdeci">#define ckd_malloc(sz)</div><div class="ttdoc">Macro for ckd_malloc </div><div class="ttdef"><b>Definition:</b> <a href="ckd__alloc_8h_source.html#l00253">ckd_alloc.h:253</a></div></div>
<div class="ttc" id="err_8h_html_a1a4495946ab2449d61108fe829a94613"><div class="ttname"><a href="err_8h.html#a1a4495946ab2449d61108fe829a94613">E_FATAL</a></div><div class="ttdeci">#define E_FATAL</div><div class="ttdoc">Exit with non-zero status after error message. </div><div class="ttdef"><b>Definition:</b> <a href="err_8h_source.html#l00127">err.h:127</a></div></div>
<div class="ttc" id="ckd__alloc_8h_html_a8246c071ac12e98b7e1df9fe6da15aef"><div class="ttname"><a href="ckd__alloc_8h.html#a8246c071ac12e98b7e1df9fe6da15aef">ckd_free_2d</a></div><div class="ttdeci">SPHINXBASE_EXPORT void ckd_free_2d(void *ptr)</div><div class="ttdoc">Free a 2-D array (ptr) previously allocated by ckd_calloc_2d. </div><div class="ttdef"><b>Definition:</b> <a href="ckd__alloc_8c_source.html#l00252">ckd_alloc.c:252</a></div></div>
<div class="ttc" id="structfe__s_html"><div class="ttname"><a href="structfe__s.html">fe_s</a></div><div class="ttdoc">Structure for the front-end computation. </div><div class="ttdef"><b>Definition:</b> <a href="fe__internal_8h_source.html#l00124">fe_internal.h:124</a></div></div>
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