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<div id="projectname">PortAudio
 <span id="projectnumber">2.0</span>
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<div class="title">paex_ocean_shore.c</div> </div>
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<a href="paex__ocean__shore_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</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"> * $Id: paex_ocean_shore.c 1816 2012-02-22 12:20:26Z robiwan $</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * This program uses the PortAudio Portable Audio Library.</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * For more information see: http://www.portaudio.com</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * Copyright (c) 1999-2000 Ross Bencina and Phil Burk</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> * Permission is hereby granted, free of charge, to any person obtaining</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> * a copy of this software and associated documentation files</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> * (the "Software"), to deal in the Software without restriction,</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> * including without limitation the rights to use, copy, modify, merge,</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> * publish, distribute, sublicense, and/or sell copies of the Software,</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> * and to permit persons to whom the Software is furnished to do so,</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> * subject to the following conditions:</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"> * The above copyright notice and this permission notice shall be</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> * included in all copies or substantial portions of the Software.</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"> * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment"> * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"> * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"> */</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="comment">/*</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"> * The text above constitutes the entire PortAudio license; however, </span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"> * the PortAudio community also makes the following non-binding requests:</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment"> * Any person wishing to distribute modifications to the Software is</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment"> * requested to send the modifications to the original developer so that</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment"> * they can be incorporated into the canonical version. It is also </span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="comment"> * requested that these non-binding requests be included along with the </span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment"> * license above.</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment"> */</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 <stdio.h></span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="preprocessor">#include <stdlib.h></span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="preprocessor">#include <string.h></span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="preprocessor">#include <math.h></span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="preprocessor">#include <time.h></span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="preprocessor">#include "<a class="code" href="portaudio_8h.html" title="The portable PortAudio API.">portaudio.h</a>"</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="preprocessor">#include "pa_ringbuffer.h"</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="preprocessor">#include "pa_util.h"</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> </div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="preprocessor">#define PINK_MAX_RANDOM_ROWS (30)</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="preprocessor"></span><span class="preprocessor">#define PINK_RANDOM_BITS (24)</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="preprocessor"></span><span class="preprocessor">#define PINK_RANDOM_SHIFT ((sizeof(long)*8)-PINK_RANDOM_BITS)</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00073"></a><span class="lineno"><a class="code" href="structPinkNoise.html"> 73</a></span> <span class="keyword">typedef</span> <span class="keyword">struct</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> {</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keywordtype">long</span> pink_Rows[PINK_MAX_RANDOM_ROWS];</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keywordtype">long</span> pink_RunningSum; <span class="comment">/* Used to optimize summing of generators. */</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="keywordtype">int</span> pink_Index; <span class="comment">/* Incremented each sample. */</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keywordtype">int</span> pink_IndexMask; <span class="comment">/* Index wrapped by ANDing with this mask. */</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keywordtype">float</span> pink_Scalar; <span class="comment">/* Used to scale within range of -1.0 to +1.0 */</span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> }</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <a class="code" href="structPinkNoise.html">PinkNoise</a>;</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> </div>
<div class="line"><a name="l00083"></a><span class="lineno"><a class="code" href="structBiQuad.html"> 83</a></span> <span class="keyword">typedef</span> <span class="keyword">struct </span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> {</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordtype">float</span> bq_b0;</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordtype">float</span> bq_b1;</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordtype">float</span> bq_b2;</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordtype">float</span> bq_a1;</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordtype">float</span> bq_a2;</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> } <a class="code" href="structBiQuad.html">BiQuad</a>;</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> </div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="keyword">typedef</span> <span class="keyword">enum</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> {</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  State_kAttack,</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  State_kPreDecay,</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  State_kDecay,</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  State_kCnt,</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> } EnvState;</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> </div>
<div class="line"><a name="l00100"></a><span class="lineno"><a class="code" href="structOceanWave.html"> 100</a></span> <span class="keyword">typedef</span> <span class="keyword">struct</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> {</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <a class="code" href="structPinkNoise.html">PinkNoise</a> wave_left;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <a class="code" href="structPinkNoise.html">PinkNoise</a> wave_right;</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> </div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <a class="code" href="structBiQuad.html">BiQuad</a> wave_bq_coeffs;</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keywordtype">float</span> wave_bq_left[2];</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keywordtype">float</span> wave_bq_right[2];</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> </div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  EnvState wave_envelope_state;</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keywordtype">float</span> wave_envelope_level;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordtype">float</span> wave_envelope_max_level;</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordtype">float</span> wave_pan_left;</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordtype">float</span> wave_pan_right;</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keywordtype">float</span> wave_attack_incr;</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keywordtype">float</span> wave_decay_incr;</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> </div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> } <a class="code" href="structOceanWave.html">OceanWave</a>;</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> </div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="comment">/* Prototypes */</span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="keyword">static</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> GenerateRandomNumber( <span class="keywordtype">void</span> );</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="keywordtype">void</span> InitializePinkNoise( <a class="code" href="structPinkNoise.html">PinkNoise</a> *pink, <span class="keywordtype">int</span> numRows );</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> <span class="keywordtype">float</span> GeneratePinkNoise( <a class="code" href="structPinkNoise.html">PinkNoise</a> *pink );</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="keywordtype">unsigned</span> GenerateWave( <a class="code" href="structOceanWave.html">OceanWave</a>* wave, <span class="keywordtype">float</span>* output, <span class="keywordtype">unsigned</span> noOfFrames);</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> </div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> <span class="comment">/************************************************************/</span></div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="comment">/* Calculate pseudo-random 32 bit number based on linear congruential method. */</span></div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> <span class="keyword">static</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> GenerateRandomNumber( <span class="keywordtype">void</span> )</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> {</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="comment">/* Change this seed for different random sequences. */</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keyword">static</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> randSeed = 22222;</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  randSeed = (randSeed * 196314165) + 907633515;</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="keywordflow">return</span> randSeed;</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> }</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> </div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="comment">/************************************************************/</span></div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> <span class="comment">/* Setup PinkNoise structure for N rows of generators. */</span></div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="keywordtype">void</span> InitializePinkNoise( <a class="code" href="structPinkNoise.html">PinkNoise</a> *pink, <span class="keywordtype">int</span> numRows )</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> {</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordtype">int</span> i;</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  <span class="keywordtype">long</span> pmax;</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  pink->pink_Index = 0;</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  pink->pink_IndexMask = (1<<numRows) - 1;</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="comment">/* Calculate maximum possible signed random value. Extra 1 for white noise always added. */</span></div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  pmax = (numRows + 1) * (1<<(PINK_RANDOM_BITS-1));</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  pink->pink_Scalar = 1.0f / pmax;</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  <span class="comment">/* Initialize rows. */</span></div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="keywordflow">for</span>( i=0; i<numRows; i++ ) pink->pink_Rows[i] = 0;</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  pink->pink_RunningSum = 0;</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span> }</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> </div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="comment">/* Generate Pink noise values between -1.0 and +1.0 */</span></div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="keywordtype">float</span> GeneratePinkNoise( <a class="code" href="structPinkNoise.html">PinkNoise</a> *pink )</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span> {</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="keywordtype">long</span> newRandom;</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  <span class="keywordtype">long</span> sum;</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="keywordtype">float</span> output;</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  <span class="comment">/* Increment and mask index. */</span></div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  pink->pink_Index = (pink->pink_Index + 1) & pink->pink_IndexMask;</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="comment">/* If index is zero, don't update any random values. */</span></div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <span class="keywordflow">if</span>( pink->pink_Index != 0 )</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  {</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <span class="comment">/* Determine how many trailing zeros in PinkIndex. */</span></div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="comment">/* This algorithm will hang if n==0 so test first. */</span></div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="keywordtype">int</span> numZeros = 0;</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="keywordtype">int</span> n = pink->pink_Index;</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="keywordflow">while</span>( (n & 1) == 0 )</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  {</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  n = n >> 1;</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  numZeros++;</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  }</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="comment">/* Replace the indexed ROWS random value.</span></div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span> <span class="comment"> * Subtract and add back to RunningSum instead of adding all the random</span></div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span> <span class="comment"> * values together. Only one changes each time.</span></div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  pink->pink_RunningSum -= pink->pink_Rows[numZeros];</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  newRandom = ((long)GenerateRandomNumber()) >> PINK_RANDOM_SHIFT;</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  pink->pink_RunningSum += newRandom;</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  pink->pink_Rows[numZeros] = newRandom;</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  }</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span> </div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="comment">/* Add extra white noise value. */</span></div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  newRandom = ((long)GenerateRandomNumber()) >> PINK_RANDOM_SHIFT;</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  sum = pink->pink_RunningSum + newRandom;</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  <span class="comment">/* Scale to range of -1.0 to 0.9999. */</span></div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  output = pink->pink_Scalar * sum;</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="keywordflow">return</span> output;</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span> }</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span> </div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> <span class="keywordtype">float</span> ProcessBiquad(<span class="keyword">const</span> <a class="code" href="structBiQuad.html">BiQuad</a>* coeffs, <span class="keywordtype">float</span>* memory, <span class="keywordtype">float</span> input)</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> {</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  <span class="keywordtype">float</span> w = input - coeffs->bq_a1 * memory[0] - coeffs->bq_a2 * memory[1];</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  <span class="keywordtype">float</span> out = coeffs->bq_b1 * memory[0] + coeffs->bq_b2 * memory[1] + coeffs->bq_b0 * w;</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  memory[1] = memory[0];</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  memory[0] = w;</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  <span class="keywordflow">return</span> out;</div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> }</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span> </div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">float</span> one_over_2Q_LP = 0.3f;</div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">float</span> one_over_2Q_HP = 1.0f;</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span> </div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span> <span class="keywordtype">unsigned</span> GenerateWave( <a class="code" href="structOceanWave.html">OceanWave</a>* wave, <span class="keywordtype">float</span>* output, <span class="keywordtype">unsigned</span> noOfFrames )</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span> {</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keywordtype">unsigned</span> retval=0,i;</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="keywordtype">float</span> targetLevel, levelIncr, currentLevel;</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  <span class="keywordflow">switch</span> (wave->wave_envelope_state)</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  {</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <span class="keywordflow">case</span> State_kAttack:</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  targetLevel = noOfFrames * wave->wave_attack_incr + wave->wave_envelope_level;</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <span class="keywordflow">if</span> (targetLevel >= wave->wave_envelope_max_level)</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  {</div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <span class="comment">/* Go to decay state */</span></div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  wave->wave_envelope_state = State_kPreDecay;</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  targetLevel = wave->wave_envelope_max_level;</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  }</div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  <span class="comment">/* Calculate lowpass biquad coeffs</span></div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span> <span class="comment"> </span></div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span> <span class="comment"> alpha = sin(w0)/(2*Q)</span></div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span> <span class="comment"></span></div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span> <span class="comment"> b0 = (1 - cos(w0))/2</span></div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span> <span class="comment"> b1 = 1 - cos(w0)</span></div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span> <span class="comment"> b2 = (1 - cos(w0))/2</span></div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span> <span class="comment"> a0 = 1 + alpha</span></div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span> <span class="comment"> a1 = -2*cos(w0)</span></div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span> <span class="comment"> a2 = 1 - alpha</span></div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span> <span class="comment"></span></div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span> <span class="comment"> w0 = [0 - pi[</span></div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  {</div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> w0 = 3.141592654f * targetLevel / wave->wave_envelope_max_level;</div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> alpha = sinf(w0) * one_over_2Q_LP;</div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> cosw0 = cosf(w0);</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> a0_fact = 1.0f / (1.0f + alpha);</div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  wave->wave_bq_coeffs.bq_b1 = (1.0f - cosw0) * a0_fact;</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  wave->wave_bq_coeffs.bq_b0 = wave->wave_bq_coeffs.bq_b1 * 0.5f;</div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  wave->wave_bq_coeffs.bq_b2 = wave->wave_bq_coeffs.bq_b0;</div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  wave->wave_bq_coeffs.bq_a2 = (1.0f - alpha) * a0_fact;</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  wave->wave_bq_coeffs.bq_a1 = -2.0f * cosw0 * a0_fact;</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  }</div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span> </div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  <span class="keywordflow">case</span> State_kPreDecay:</div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  <span class="comment">/* Reset biquad state */</span></div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  memset(wave->wave_bq_left, 0, 2 * <span class="keyword">sizeof</span>(<span class="keywordtype">float</span>));</div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  memset(wave->wave_bq_right, 0, 2 * <span class="keyword">sizeof</span>(<span class="keywordtype">float</span>));</div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  wave->wave_envelope_state = State_kDecay;</div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span> </div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  <span class="comment">/* Deliberate fall-through */</span></div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span> </div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  <span class="keywordflow">case</span> State_kDecay:</div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  targetLevel = noOfFrames * wave->wave_decay_incr + wave->wave_envelope_level;</div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  <span class="keywordflow">if</span> (targetLevel < 0.001f)</div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  {</div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  <span class="comment">/* < -60 dB, we're done */</span></div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  wave->wave_envelope_state = 3;</div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  retval = 1;</div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  }</div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  <span class="comment">/* Calculate highpass biquad coeffs</span></div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span> <span class="comment"></span></div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span> <span class="comment"> alpha = sin(w0)/(2*Q)</span></div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span> <span class="comment"></span></div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span> <span class="comment"> b0 = (1 + cos(w0))/2</span></div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span> <span class="comment"> b1 = -(1 + cos(w0))</span></div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span> <span class="comment"> b2 = (1 + cos(w0))/2</span></div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span> <span class="comment"> a0 = 1 + alpha</span></div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span> <span class="comment"> a1 = -2*cos(w0)</span></div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span> <span class="comment"> a2 = 1 - alpha</span></div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span> <span class="comment"></span></div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span> <span class="comment"> w0 = [0 - pi/2[</span></div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  {</div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> v = targetLevel / wave->wave_envelope_max_level;</div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> w0 = 1.5707963f * (1.0f - (v*v));</div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> alpha = sinf(w0) * one_over_2Q_HP;</div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> cosw0 = cosf(w0);</div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> a0_fact = 1.0f / (1.0f + alpha);</div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  wave->wave_bq_coeffs.bq_b1 = (float)(- (1 + cosw0) * a0_fact);</div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  wave->wave_bq_coeffs.bq_b0 = -wave->wave_bq_coeffs.bq_b1 * 0.5f;</div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  wave->wave_bq_coeffs.bq_b2 = wave->wave_bq_coeffs.bq_b0;</div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  wave->wave_bq_coeffs.bq_a2 = (float)((1.0 - alpha) * a0_fact);</div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  wave->wave_bq_coeffs.bq_a1 = (float)(-2.0 * cosw0 * a0_fact);</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="keywordflow">break</span>;</div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span> </div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  <span class="keywordflow">default</span>:</div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  }</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>  currentLevel = wave->wave_envelope_level;</div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  wave->wave_envelope_level = targetLevel;</div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  levelIncr = (targetLevel - currentLevel) / noOfFrames;</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="keywordflow">for</span> (i = 0; i < noOfFrames; ++i, currentLevel += levelIncr)</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>  (*output++) += ProcessBiquad(&wave->wave_bq_coeffs, wave->wave_bq_left, (GeneratePinkNoise(&wave->wave_left))) * currentLevel * wave->wave_pan_left;</div>
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  (*output++) += ProcessBiquad(&wave->wave_bq_coeffs, wave->wave_bq_right, (GeneratePinkNoise(&wave->wave_right))) * currentLevel * wave->wave_pan_right;</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> </div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  <span class="keywordflow">return</span> retval;</div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span> }</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="comment">/*******************************************************************/</span></div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span> </div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span> <span class="comment">/* Context for callback routine. */</span></div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span> <span class="keyword">typedef</span> <span class="keyword">struct</span></div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span> {</div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  <a class="code" href="structOceanWave.html">OceanWave</a>* waves[16]; <span class="comment">/* Maximum 16 waves */</span></div>
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  <span class="keywordtype">unsigned</span> noOfActiveWaves;</div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span> </div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  <span class="comment">/* Ring buffer (FIFO) for "communicating" towards audio callback */</span></div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  PaUtilRingBuffer rBufToRT;</div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  <span class="keywordtype">void</span>* rBufToRTData;</div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span> </div>
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  <span class="comment">/* Ring buffer (FIFO) for "communicating" from audio callback */</span></div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  PaUtilRingBuffer rBufFromRT;</div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  <span class="keywordtype">void</span>* rBufFromRTData;</div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span> }</div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span> <a class="code" href="structpaTestData.html">paTestData</a>;</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">/* This routine will be called by the PortAudio engine when audio is needed.</span></div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span> <span class="comment">** It may called at interrupt level on some machines so don't do anything</span></div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span> <span class="comment">** that could mess up the system like calling malloc() or free().</span></div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span> <span class="comment">*/</span></div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span> <span class="keyword">static</span> <span class="keywordtype">int</span> patestCallback(<span class="keyword">const</span> <span class="keywordtype">void</span>* inputBuffer,</div>
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  <span class="keywordtype">void</span>* outputBuffer,</div>
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> framesPerBuffer,</div>
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  <span class="keyword">const</span> <a class="code" href="structPaStreamCallbackTimeInfo.html">PaStreamCallbackTimeInfo</a>* timeInfo,</div>
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  <a class="code" href="portaudio_8h.html#a55a005924bcfa0424594f4f65cd4ae82">PaStreamCallbackFlags</a> statusFlags,</div>
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  <span class="keywordtype">void</span>* userData)</div>
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span> {</div>
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  <span class="keywordtype">int</span> i;</div>
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span>  <a class="code" href="structpaTestData.html">paTestData</a> *data = (<a class="code" href="structpaTestData.html">paTestData</a>*)userData;</div>
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  <span class="keywordtype">float</span> *out = (<span class="keywordtype">float</span>*)outputBuffer;</div>
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  (void) inputBuffer; <span class="comment">/* Prevent "unused variable" warnings. */</span></div>
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span> </div>
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  <span class="comment">/* Reset output data first */</span></div>
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  memset(out, 0, framesPerBuffer * 2 * <span class="keyword">sizeof</span>(<span class="keywordtype">float</span>));</div>
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span> </div>
<div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  <span class="keywordflow">for</span> (i = 0; i < 16; ++i)</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>  <span class="comment">/* Consume the input queue */</span></div>
<div class="line"><a name="l00342"></a><span class="lineno"> 342</span>  <span class="keywordflow">if</span> (data->waves[i] == 0 && PaUtil_GetRingBufferReadAvailable(&data->rBufToRT))</div>
<div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  {</div>
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  <a class="code" href="structOceanWave.html">OceanWave</a>* ptr = 0;</div>
<div class="line"><a name="l00345"></a><span class="lineno"> 345</span>  PaUtil_ReadRingBuffer(&data->rBufToRT, &ptr, 1);</div>
<div class="line"><a name="l00346"></a><span class="lineno"> 346</span>  data->waves[i] = ptr;</div>
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span>  }</div>
<div class="line"><a name="l00348"></a><span class="lineno"> 348</span> </div>
<div class="line"><a name="l00349"></a><span class="lineno"> 349</span>  <span class="keywordflow">if</span> (data->waves[i] != 0)</div>
<div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  {</div>
<div class="line"><a name="l00351"></a><span class="lineno"> 351</span>  <span class="keywordflow">if</span> (GenerateWave(data->waves[i], out, framesPerBuffer))</div>
<div class="line"><a name="l00352"></a><span class="lineno"> 352</span>  {</div>
<div class="line"><a name="l00353"></a><span class="lineno"> 353</span>  <span class="comment">/* If wave is "done", post it back to the main thread for deletion */</span></div>
<div class="line"><a name="l00354"></a><span class="lineno"> 354</span>  PaUtil_WriteRingBuffer(&data->rBufFromRT, &data->waves[i], 1);</div>
<div class="line"><a name="l00355"></a><span class="lineno"> 355</span>  data->waves[i] = 0;</div>
<div class="line"><a name="l00356"></a><span class="lineno"> 356</span>  }</div>
<div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  }</div>
<div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  }</div>
<div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  <span class="keywordflow">return</span> <a class="code" href="portaudio_8h.html#ae9bfb9c4e1895326f30f80d415c66c32acba49cbf0e3bf605bb3deecef3b4fce3">paContinue</a>;</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> </div>
<div class="line"><a name="l00362"></a><span class="lineno"> 362</span> <span class="preprocessor">#define NEW_ROW_SIZE (12 + (8*rand())/RAND_MAX)</span></div>
<div class="line"><a name="l00363"></a><span class="lineno"> 363</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00364"></a><span class="lineno"> 364</span> <a class="code" href="structOceanWave.html">OceanWave</a>* InitializeWave(<span class="keywordtype">double</span> SR, <span class="keywordtype">float</span> attackInSeconds, <span class="keywordtype">float</span> maxLevel, <span class="keywordtype">float</span> positionLeftRight)</div>
<div class="line"><a name="l00365"></a><span class="lineno"> 365</span> {</div>
<div class="line"><a name="l00366"></a><span class="lineno"> 366</span>  <a class="code" href="structOceanWave.html">OceanWave</a>* wave = NULL;</div>
<div class="line"><a name="l00367"></a><span class="lineno"> 367</span>  <span class="keyword">static</span> <span class="keywordtype">unsigned</span> lastNoOfRows = 12;</div>
<div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  <span class="keywordtype">unsigned</span> newNoOfRows;</div>
<div class="line"><a name="l00369"></a><span class="lineno"> 369</span> </div>
<div class="line"><a name="l00370"></a><span class="lineno"> 370</span>  wave = (<a class="code" href="structOceanWave.html">OceanWave</a>*)PaUtil_AllocateMemory(<span class="keyword">sizeof</span>(<a class="code" href="structOceanWave.html">OceanWave</a>));</div>
<div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  <span class="keywordflow">if</span> (wave != NULL)</div>
<div class="line"><a name="l00372"></a><span class="lineno"> 372</span>  {</div>
<div class="line"><a name="l00373"></a><span class="lineno"> 373</span>  InitializePinkNoise(&wave->wave_left, lastNoOfRows);</div>
<div class="line"><a name="l00374"></a><span class="lineno"> 374</span>  <span class="keywordflow">while</span> ((newNoOfRows = NEW_ROW_SIZE) == lastNoOfRows);</div>
<div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  InitializePinkNoise(&wave->wave_right, newNoOfRows);</div>
<div class="line"><a name="l00376"></a><span class="lineno"> 376</span>  lastNoOfRows = newNoOfRows;</div>
<div class="line"><a name="l00377"></a><span class="lineno"> 377</span> </div>
<div class="line"><a name="l00378"></a><span class="lineno"> 378</span>  wave->wave_envelope_state = State_kAttack;</div>
<div class="line"><a name="l00379"></a><span class="lineno"> 379</span>  wave->wave_envelope_level = 0.f;</div>
<div class="line"><a name="l00380"></a><span class="lineno"> 380</span>  wave->wave_envelope_max_level = maxLevel;</div>
<div class="line"><a name="l00381"></a><span class="lineno"> 381</span>  wave->wave_attack_incr = wave->wave_envelope_max_level / (attackInSeconds * (float)SR);</div>
<div class="line"><a name="l00382"></a><span class="lineno"> 382</span>  wave->wave_decay_incr = - wave->wave_envelope_max_level / (attackInSeconds * 4 * (float)SR);</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>  wave->wave_pan_left = sqrtf(1.0 - positionLeftRight);</div>
<div class="line"><a name="l00385"></a><span class="lineno"> 385</span>  wave->wave_pan_right = sqrtf(positionLeftRight);</div>
<div class="line"><a name="l00386"></a><span class="lineno"> 386</span>  }</div>
<div class="line"><a name="l00387"></a><span class="lineno"> 387</span>  <span class="keywordflow">return</span> wave;</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> </div>
<div class="line"><a name="l00390"></a><span class="lineno"> 390</span> <span class="keyword">static</span> <span class="keywordtype">float</span> GenerateFloatRandom(<span class="keywordtype">float</span> minValue, <span class="keywordtype">float</span> maxValue)</div>
<div class="line"><a name="l00391"></a><span class="lineno"> 391</span> {</div>
<div class="line"><a name="l00392"></a><span class="lineno"> 392</span>  <span class="keywordflow">return</span> minValue + ((maxValue - minValue) * rand()) / RAND_MAX;</div>
<div class="line"><a name="l00393"></a><span class="lineno"> 393</span> }</div>
<div class="line"><a name="l00394"></a><span class="lineno"> 394</span> </div>
<div class="line"><a name="l00395"></a><span class="lineno"> 395</span> <span class="comment">/*******************************************************************/</span></div>
<div class="line"><a name="l00396"></a><span class="lineno"> 396</span> <span class="keywordtype">int</span> main(<span class="keywordtype">void</span>);</div>
<div class="line"><a name="l00397"></a><span class="lineno"> 397</span> <span class="keywordtype">int</span> main(<span class="keywordtype">void</span>)</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>  <a class="code" href="portaudio_8h.html#a19874734f89958fccf86785490d53b4c">PaStream</a>* stream;</div>
<div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  <a class="code" href="portaudio_8h.html#a4949e4a8ef9f9dbe8cbee414ce69841d">PaError</a> err;</div>
<div class="line"><a name="l00401"></a><span class="lineno"> 401</span>  <a class="code" href="structpaTestData.html">paTestData</a> data = {0};</div>
<div class="line"><a name="l00402"></a><span class="lineno"> 402</span>  <a class="code" href="structPaStreamParameters.html">PaStreamParameters</a> outputParameters;</div>
<div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  <span class="keywordtype">double</span> tstamp;</div>
<div class="line"><a name="l00404"></a><span class="lineno"> 404</span>  <span class="keywordtype">double</span> tstart;</div>
<div class="line"><a name="l00405"></a><span class="lineno"> 405</span>  <span class="keywordtype">double</span> tdelta = 0;</div>
<div class="line"><a name="l00406"></a><span class="lineno"> 406</span>  <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">double</span> SR = 44100.0;</div>
<div class="line"><a name="l00407"></a><span class="lineno"> 407</span>  <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> FPB = 128; <span class="comment">/* Frames per buffer: 2.9 ms buffers. */</span></div>
<div class="line"><a name="l00408"></a><span class="lineno"> 408</span> </div>
<div class="line"><a name="l00409"></a><span class="lineno"> 409</span>  <span class="comment">/* Initialize communication buffers (queues) */</span></div>
<div class="line"><a name="l00410"></a><span class="lineno"> 410</span>  data.rBufToRTData = PaUtil_AllocateMemory(<span class="keyword">sizeof</span>(<a class="code" href="structOceanWave.html">OceanWave</a>*) * 256);</div>
<div class="line"><a name="l00411"></a><span class="lineno"> 411</span>  <span class="keywordflow">if</span> (data.rBufToRTData == NULL)</div>
<div class="line"><a name="l00412"></a><span class="lineno"> 412</span>  {</div>
<div class="line"><a name="l00413"></a><span class="lineno"> 413</span>  <span class="keywordflow">return</span> 1;</div>
<div class="line"><a name="l00414"></a><span class="lineno"> 414</span>  }</div>
<div class="line"><a name="l00415"></a><span class="lineno"> 415</span>  PaUtil_InitializeRingBuffer(&data.rBufToRT, <span class="keyword">sizeof</span>(<a class="code" href="structOceanWave.html">OceanWave</a>*), 256, data.rBufToRTData);</div>
<div class="line"><a name="l00416"></a><span class="lineno"> 416</span> </div>
<div class="line"><a name="l00417"></a><span class="lineno"> 417</span>  data.rBufFromRTData = PaUtil_AllocateMemory(<span class="keyword">sizeof</span>(<a class="code" href="structOceanWave.html">OceanWave</a>*) * 256);</div>
<div class="line"><a name="l00418"></a><span class="lineno"> 418</span>  <span class="keywordflow">if</span> (data.rBufFromRTData == NULL)</div>
<div class="line"><a name="l00419"></a><span class="lineno"> 419</span>  {</div>
<div class="line"><a name="l00420"></a><span class="lineno"> 420</span>  <span class="keywordflow">return</span> 1;</div>
<div class="line"><a name="l00421"></a><span class="lineno"> 421</span>  }</div>
<div class="line"><a name="l00422"></a><span class="lineno"> 422</span>  PaUtil_InitializeRingBuffer(&data.rBufFromRT, <span class="keyword">sizeof</span>(<a class="code" href="structOceanWave.html">OceanWave</a>*), 256, data.rBufFromRTData);</div>
<div class="line"><a name="l00423"></a><span class="lineno"> 423</span> </div>
<div class="line"><a name="l00424"></a><span class="lineno"> 424</span>  err = <a class="code" href="portaudio_8h.html#abed859482d156622d9332dff9b2d89da">Pa_Initialize</a>();</div>
<div class="line"><a name="l00425"></a><span class="lineno"> 425</span>  <span class="keywordflow">if</span>( err != paNoError ) <span class="keywordflow">goto</span> error;</div>
<div class="line"><a name="l00426"></a><span class="lineno"> 426</span> </div>
<div class="line"><a name="l00427"></a><span class="lineno"> 427</span>  <span class="comment">/* Open a stereo PortAudio stream so we can hear the result. */</span></div>
<div class="line"><a name="l00428"></a><span class="lineno"> 428</span>  outputParameters.<a class="code" href="structPaStreamParameters.html#aebaf648b4d11dd1252a747b76b8da084">device</a> = <a class="code" href="portaudio_8h.html#adc955dfab007624000695c48d4f876dc">Pa_GetDefaultOutputDevice</a>(); <span class="comment">/* Take the default output device. */</span></div>
<div class="line"><a name="l00429"></a><span class="lineno"> 429</span>  <span class="keywordflow">if</span> (outputParameters.<a class="code" href="structPaStreamParameters.html#aebaf648b4d11dd1252a747b76b8da084">device</a> == <a class="code" href="portaudio_8h.html#a8c26dd5e6f28bb4cda7a1f5460282297">paNoDevice</a>) {</div>
<div class="line"><a name="l00430"></a><span class="lineno"> 430</span>  fprintf(stderr,<span class="stringliteral">"Error: No default output device.\n"</span>);</div>
<div class="line"><a name="l00431"></a><span class="lineno"> 431</span>  <span class="keywordflow">goto</span> error;</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>  outputParameters.<a class="code" href="structPaStreamParameters.html#a861ff361da71fc2572dd356c9c9878ca">channelCount</a> = 2; <span class="comment">/* Stereo output, most likely supported. */</span></div>
<div class="line"><a name="l00434"></a><span class="lineno"> 434</span>  outputParameters.<a class="code" href="structPaStreamParameters.html#aff01b9fa0710ad1654471e97665c06a9">hostApiSpecificStreamInfo</a> = NULL;</div>
<div class="line"><a name="l00435"></a><span class="lineno"> 435</span>  outputParameters.<a class="code" href="structPaStreamParameters.html#ad8d2d3063757b812f9e5f8709f41052b">sampleFormat</a> = <a class="code" href="portaudio_8h.html#a2f16d29916725b8791eae60ab9e0b081">paFloat32</a>; <span class="comment">/* 32 bit floating point output. */</span></div>
<div class="line"><a name="l00436"></a><span class="lineno"> 436</span>  outputParameters.<a class="code" href="structPaStreamParameters.html#aa1e80ac0551162fd091db8936ccbe9a0">suggestedLatency</a> = <a class="code" href="portaudio_8h.html#ac7d8e091ffc1d1d4a035704660e117eb">Pa_GetDeviceInfo</a>(outputParameters.<a class="code" href="structPaStreamParameters.html#aebaf648b4d11dd1252a747b76b8da084">device</a>)->defaultLowOutputLatency;</div>
<div class="line"><a name="l00437"></a><span class="lineno"> 437</span>  err = <a class="code" href="portaudio_8h.html#a443ad16338191af364e3be988014cbbe">Pa_OpenStream</a>(&stream,</div>
<div class="line"><a name="l00438"></a><span class="lineno"> 438</span>  NULL, <span class="comment">/* No input. */</span></div>
<div class="line"><a name="l00439"></a><span class="lineno"> 439</span>  &outputParameters,</div>
<div class="line"><a name="l00440"></a><span class="lineno"> 440</span>  SR, <span class="comment">/* Sample rate. */</span></div>
<div class="line"><a name="l00441"></a><span class="lineno"> 441</span>  FPB, <span class="comment">/* Frames per buffer. */</span></div>
<div class="line"><a name="l00442"></a><span class="lineno"> 442</span>  <a class="code" href="portaudio_8h.html#add037e93aec78fa8d67f7a59ed500707">paDitherOff</a>, <span class="comment">/* Clip but don't dither */</span></div>
<div class="line"><a name="l00443"></a><span class="lineno"> 443</span>  patestCallback,</div>
<div class="line"><a name="l00444"></a><span class="lineno"> 444</span>  &data);</div>
<div class="line"><a name="l00445"></a><span class="lineno"> 445</span>  <span class="keywordflow">if</span>( err != paNoError ) <span class="keywordflow">goto</span> error;</div>
<div class="line"><a name="l00446"></a><span class="lineno"> 446</span> </div>
<div class="line"><a name="l00447"></a><span class="lineno"> 447</span>  err = <a class="code" href="portaudio_8h.html#a7432aadd26c40452da12fa99fc1a047b">Pa_StartStream</a>( stream );</div>
<div class="line"><a name="l00448"></a><span class="lineno"> 448</span>  <span class="keywordflow">if</span>( err != paNoError ) <span class="keywordflow">goto</span> error;</div>
<div class="line"><a name="l00449"></a><span class="lineno"> 449</span> </div>
<div class="line"><a name="l00450"></a><span class="lineno"> 450</span>  printf(<span class="stringliteral">"Stereo \"ocean waves\" for one minute...\n"</span>);</div>
<div class="line"><a name="l00451"></a><span class="lineno"> 451</span> </div>
<div class="line"><a name="l00452"></a><span class="lineno"> 452</span>  tstart = PaUtil_GetTime();</div>
<div class="line"><a name="l00453"></a><span class="lineno"> 453</span>  tstamp = tstart;</div>
<div class="line"><a name="l00454"></a><span class="lineno"> 454</span>  srand( (<span class="keywordtype">unsigned</span>)time(NULL) );</div>
<div class="line"><a name="l00455"></a><span class="lineno"> 455</span> </div>
<div class="line"><a name="l00456"></a><span class="lineno"> 456</span>  <span class="keywordflow">while</span>( ( err = <a class="code" href="portaudio_8h.html#a1f8709c4971932643681a6f374c4bb5a">Pa_IsStreamActive</a>( stream ) ) == 1 )</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>  <span class="keyword">const</span> <span class="keywordtype">double</span> tcurrent = PaUtil_GetTime();</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">/* Delete "waves" that the callback is finished with */</span></div>
<div class="line"><a name="l00461"></a><span class="lineno"> 461</span>  <span class="keywordflow">while</span> (PaUtil_GetRingBufferReadAvailable(&data.rBufFromRT) > 0)</div>
<div class="line"><a name="l00462"></a><span class="lineno"> 462</span>  {</div>
<div class="line"><a name="l00463"></a><span class="lineno"> 463</span>  <a class="code" href="structOceanWave.html">OceanWave</a>* ptr = 0;</div>
<div class="line"><a name="l00464"></a><span class="lineno"> 464</span>  PaUtil_ReadRingBuffer(&data.rBufFromRT, &ptr, 1);</div>
<div class="line"><a name="l00465"></a><span class="lineno"> 465</span>  <span class="keywordflow">if</span> (ptr != 0)</div>
<div class="line"><a name="l00466"></a><span class="lineno"> 466</span>  {</div>
<div class="line"><a name="l00467"></a><span class="lineno"> 467</span>  printf(<span class="stringliteral">"Wave is deleted...\n"</span>);</div>
<div class="line"><a name="l00468"></a><span class="lineno"> 468</span>  PaUtil_FreeMemory(ptr);</div>
<div class="line"><a name="l00469"></a><span class="lineno"> 469</span>  --data.noOfActiveWaves;</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">if</span> (tcurrent - tstart < 60.0) <span class="comment">/* Only start new "waves" during one minute */</span></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>  <span class="keywordflow">if</span> (tcurrent >= tstamp)</div>
<div class="line"><a name="l00476"></a><span class="lineno"> 476</span>  {</div>
<div class="line"><a name="l00477"></a><span class="lineno"> 477</span>  <span class="keywordtype">double</span> tdelta = GenerateFloatRandom(1.0f, 4.0f);</div>
<div class="line"><a name="l00478"></a><span class="lineno"> 478</span>  tstamp += tdelta;</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="keywordflow">if</span> (data.noOfActiveWaves<16)</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="keyword">const</span> <span class="keywordtype">float</span> attackTime = GenerateFloatRandom(2.0f, 6.0f);</div>
<div class="line"><a name="l00483"></a><span class="lineno"> 483</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> level = GenerateFloatRandom(0.1f, 1.0f);</div>
<div class="line"><a name="l00484"></a><span class="lineno"> 484</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> pos = GenerateFloatRandom(0.0f, 1.0f);</div>
<div class="line"><a name="l00485"></a><span class="lineno"> 485</span>  <a class="code" href="structOceanWave.html">OceanWave</a>* p = InitializeWave(SR, attackTime, level, pos);</div>
<div class="line"><a name="l00486"></a><span class="lineno"> 486</span>  <span class="keywordflow">if</span> (p != NULL)</div>
<div class="line"><a name="l00487"></a><span class="lineno"> 487</span>  {</div>
<div class="line"><a name="l00488"></a><span class="lineno"> 488</span>  <span class="comment">/* Post wave to audio callback */</span></div>
<div class="line"><a name="l00489"></a><span class="lineno"> 489</span>  PaUtil_WriteRingBuffer(&data.rBufToRT, &p, 1);</div>
<div class="line"><a name="l00490"></a><span class="lineno"> 490</span>  ++data.noOfActiveWaves;</div>
<div class="line"><a name="l00491"></a><span class="lineno"> 491</span> </div>
<div class="line"><a name="l00492"></a><span class="lineno"> 492</span>  printf(<span class="stringliteral">"Starting wave at level = %.2f, attack = %.2lf, pos = %.2lf\n"</span>, level, attackTime, pos);</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>  }</div>
<div class="line"><a name="l00495"></a><span class="lineno"> 495</span>  }</div>
<div class="line"><a name="l00496"></a><span class="lineno"> 496</span>  }</div>
<div class="line"><a name="l00497"></a><span class="lineno"> 497</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00498"></a><span class="lineno"> 498</span>  {</div>
<div class="line"><a name="l00499"></a><span class="lineno"> 499</span>  <span class="keywordflow">if</span> (data.noOfActiveWaves == 0)</div>
<div class="line"><a name="l00500"></a><span class="lineno"> 500</span>  {</div>
<div class="line"><a name="l00501"></a><span class="lineno"> 501</span>  printf(<span class="stringliteral">"All waves finished!\n"</span>);</div>
<div class="line"><a name="l00502"></a><span class="lineno"> 502</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00503"></a><span class="lineno"> 503</span>  }</div>
<div class="line"><a name="l00504"></a><span class="lineno"> 504</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>  <a class="code" href="portaudio_8h.html#a1b3c20044c9401c42add29475636e83d">Pa_Sleep</a>(100);</div>
<div class="line"><a name="l00507"></a><span class="lineno"> 507</span>  }</div>
<div class="line"><a name="l00508"></a><span class="lineno"> 508</span>  <span class="keywordflow">if</span>( err < 0 ) <span class="keywordflow">goto</span> error;</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>  err = <a class="code" href="portaudio_8h.html#a92f56f88cbd14da0e8e03077e835d104">Pa_CloseStream</a>( stream );</div>
<div class="line"><a name="l00511"></a><span class="lineno"> 511</span>  <span class="keywordflow">if</span>( err != paNoError ) <span class="keywordflow">goto</span> error;</div>
<div class="line"><a name="l00512"></a><span class="lineno"> 512</span> </div>
<div class="line"><a name="l00513"></a><span class="lineno"> 513</span>  <span class="keywordflow">if</span> (data.rBufToRTData)</div>
<div class="line"><a name="l00514"></a><span class="lineno"> 514</span>  {</div>
<div class="line"><a name="l00515"></a><span class="lineno"> 515</span>  PaUtil_FreeMemory(data.rBufToRTData);</div>
<div class="line"><a name="l00516"></a><span class="lineno"> 516</span>  }</div>
<div class="line"><a name="l00517"></a><span class="lineno"> 517</span>  <span class="keywordflow">if</span> (data.rBufFromRTData)</div>
<div class="line"><a name="l00518"></a><span class="lineno"> 518</span>  {</div>
<div class="line"><a name="l00519"></a><span class="lineno"> 519</span>  PaUtil_FreeMemory(data.rBufFromRTData);</div>
<div class="line"><a name="l00520"></a><span class="lineno"> 520</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>  <a class="code" href="portaudio_8h.html#a1b3c20044c9401c42add29475636e83d">Pa_Sleep</a>(1000);</div>
<div class="line"><a name="l00523"></a><span class="lineno"> 523</span> </div>
<div class="line"><a name="l00524"></a><span class="lineno"> 524</span>  <a class="code" href="portaudio_8h.html#a0db317604e916e8bd6098e60e6237221">Pa_Terminate</a>();</div>
<div class="line"><a name="l00525"></a><span class="lineno"> 525</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00526"></a><span class="lineno"> 526</span> </div>
<div class="line"><a name="l00527"></a><span class="lineno"> 527</span> error:</div>
<div class="line"><a name="l00528"></a><span class="lineno"> 528</span>  <a class="code" href="portaudio_8h.html#a0db317604e916e8bd6098e60e6237221">Pa_Terminate</a>();</div>
<div class="line"><a name="l00529"></a><span class="lineno"> 529</span>  fprintf( stderr, <span class="stringliteral">"An error occured while using the portaudio stream\n"</span> );</div>
<div class="line"><a name="l00530"></a><span class="lineno"> 530</span>  fprintf( stderr, <span class="stringliteral">"Error number: %d\n"</span>, err );</div>
<div class="line"><a name="l00531"></a><span class="lineno"> 531</span>  fprintf( stderr, <span class="stringliteral">"Error message: %s\n"</span>, <a class="code" href="portaudio_8h.html#ae606855a611cf29c7d2d7421df5e3b5d">Pa_GetErrorText</a>( err ) );</div>
<div class="line"><a name="l00532"></a><span class="lineno"> 532</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00533"></a><span class="lineno"> 533</span> }</div>
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