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<div id="projectname">PortAudio
 <span id="projectnumber">2.0</span>
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<div class="title">paex_pink.c</div> </div>
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<a href="paex__pink_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="l00019"></a><span class="lineno"> 19</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * $Id: paex_pink.c 1752 2011-09-08 03:21:55Z philburk $</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 program uses the PortAudio Portable Audio Library.</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> * For more information see: http://www.portaudio.com</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * Copyright (c) 1999-2000 Ross Bencina and Phil Burk</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * Permission is hereby granted, free of charge, to any person obtaining</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * a copy of this software and associated documentation files</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> * (the "Software"), to deal in the Software without restriction,</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> * including without limitation the rights to use, copy, modify, merge,</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> * publish, distribute, sublicense, and/or sell copies of the Software,</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> * and to permit persons to whom the Software is furnished to do so,</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> * subject to the following conditions:</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"> * The above copyright notice and this permission notice shall be</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> * included in all copies or substantial portions of the Software.</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"> * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"> * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"> * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> </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> <span class="comment"> * The text above constitutes the entire PortAudio license; however, </span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment"> * the PortAudio community also makes the following non-binding requests:</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"> * Any person wishing to distribute modifications to the Software is</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"> * requested to send the modifications to the original developer so that</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment"> * they can be incorporated into the canonical version. It is also </span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment"> * requested that these non-binding requests be included along with the </span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment"> * license above.</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> </div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="preprocessor">#include <stdio.h></span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="preprocessor">#include <math.h></span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</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="l00060"></a><span class="lineno"> 60</span> </div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="preprocessor">#define PINK_MAX_RANDOM_ROWS (30)</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="preprocessor"></span><span class="preprocessor">#define PINK_RANDOM_BITS (24)</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</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="l00064"></a><span class="lineno"> 64</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="keyword">typedef</span> <span class="keyword">struct</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="keywordtype">long</span> pink_Rows[PINK_MAX_RANDOM_ROWS];</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordtype">long</span> pink_RunningSum; <span class="comment">/* Used to optimize summing of generators. */</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordtype">int</span> pink_Index; <span class="comment">/* Incremented each sample. */</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</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="l00071"></a><span class="lineno"> 71</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="l00072"></a><span class="lineno"> 72</span> }</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <a class="code" href="structPinkNoise.html">PinkNoise</a>;</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="comment">/* Prototypes */</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</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="l00077"></a><span class="lineno"> 77</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="l00078"></a><span class="lineno"> 78</span> <span class="keywordtype">float</span> GeneratePinkNoise( <a class="code" href="structPinkNoise.html">PinkNoise</a> *pink );</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="comment">/************************************************************/</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment">/* Calculate pseudo-random 32 bit number based on linear congruential method. */</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</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="l00083"></a><span class="lineno"> 83</span> {</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="comment">/* Change this seed for different random sequences. */</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keyword">static</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> randSeed = 22222;</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  randSeed = (randSeed * 196314165) + 907633515;</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordflow">return</span> randSeed;</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> }</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> </div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="comment">/************************************************************/</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment">/* Setup PinkNoise structure for N rows of generators. */</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</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="l00093"></a><span class="lineno"> 93</span> {</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordtype">int</span> i;</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordtype">long</span> pmax;</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  pink->pink_Index = 0;</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  pink->pink_IndexMask = (1<<numRows) - 1;</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="comment">/* Calculate maximum possible signed random value. Extra 1 for white noise always added. */</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  pmax = (numRows + 1) * (1<<(PINK_RANDOM_BITS-1));</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  pink->pink_Scalar = 1.0f / pmax;</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="comment">/* Initialize rows. */</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordflow">for</span>( i=0; i<numRows; i++ ) pink->pink_Rows[i] = 0;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  pink->pink_RunningSum = 0;</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> </div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="preprocessor">#define PINK_MEASURE</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="preprocessor"></span><span class="preprocessor">#ifdef PINK_MEASURE</span></div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="preprocessor"></span><span class="keywordtype">float</span> pinkMax = -999.0;</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> <span class="keywordtype">float</span> pinkMin = 999.0;</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> <span class="comment">/* Generate Pink noise values between -1.0 and +1.0 */</span></div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> <span class="keywordtype">float</span> GeneratePinkNoise( <a class="code" href="structPinkNoise.html">PinkNoise</a> *pink )</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> {</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keywordtype">long</span> newRandom;</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keywordtype">long</span> sum;</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keywordtype">float</span> output;</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="comment">/* Increment and mask index. */</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  pink->pink_Index = (pink->pink_Index + 1) & pink->pink_IndexMask;</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="comment">/* If index is zero, don't update any random values. */</span></div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keywordflow">if</span>( pink->pink_Index != 0 )</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  {</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="comment">/* Determine how many trailing zeros in PinkIndex. */</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="comment">/* This algorithm will hang if n==0 so test first. */</span></div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordtype">int</span> numZeros = 0;</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordtype">int</span> n = pink->pink_Index;</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="keywordflow">while</span>( (n & 1) == 0 )</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>  n = n >> 1;</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  numZeros++;</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  }</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="comment">/* Replace the indexed ROWS random value.</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="comment"> * Subtract and add back to RunningSum instead of adding all the random</span></div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> <span class="comment"> * values together. Only one changes each time.</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>  pink->pink_RunningSum -= pink->pink_Rows[numZeros];</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  newRandom = ((long)GenerateRandomNumber()) >> PINK_RANDOM_SHIFT;</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  pink->pink_RunningSum += newRandom;</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  pink->pink_Rows[numZeros] = newRandom;</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  }</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> </div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="comment">/* Add extra white noise value. */</span></div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  newRandom = ((long)GenerateRandomNumber()) >> PINK_RANDOM_SHIFT;</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  sum = pink->pink_RunningSum + newRandom;</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="comment">/* Scale to range of -1.0 to 0.9999. */</span></div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  output = pink->pink_Scalar * sum;</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <span class="preprocessor">#ifdef PINK_MEASURE</span></div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> <span class="preprocessor"></span> <span class="comment">/* Check Min/Max */</span></div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="keywordflow">if</span>( output > pinkMax ) pinkMax = output;</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span>( output < pinkMin ) pinkMin = output;</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="preprocessor"></span> <span class="keywordflow">return</span> output;</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> </div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> <span class="comment">/*******************************************************************/</span></div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> <span class="preprocessor">#define PINK_TEST</span></div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> <span class="preprocessor"></span><span class="preprocessor">#ifdef PINK_TEST</span></div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> <span class="comment">/* Context for callback routine. */</span></div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span> <span class="keyword">typedef</span> <span class="keyword">struct</span></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>  <a class="code" href="structPinkNoise.html">PinkNoise</a> leftPink;</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <a class="code" href="structPinkNoise.html">PinkNoise</a> rightPink;</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> sampsToGo;</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span> }</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span> <a class="code" href="structpaTestData.html">paTestData</a>;</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> <span class="comment">/* This routine will be called by the PortAudio engine when audio is needed.</span></div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</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="l00170"></a><span class="lineno"> 170</span> <span class="comment">** that could mess up the system like calling malloc() or free().</span></div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span> <span class="comment">*/</span></div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</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="l00173"></a><span class="lineno"> 173</span>  <span class="keywordtype">void</span>* outputBuffer,</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> framesPerBuffer,</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="keyword">const</span> <a class="code" href="structPaStreamCallbackTimeInfo.html">PaStreamCallbackTimeInfo</a>* timeInfo,</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <a class="code" href="portaudio_8h.html#a55a005924bcfa0424594f4f65cd4ae82">PaStreamCallbackFlags</a> statusFlags,</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  <span class="keywordtype">void</span>* userData)</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> {</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  <span class="keywordtype">int</span> finished;</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="keywordtype">int</span> i;</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="keywordtype">int</span> numFrames;</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</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="l00183"></a><span class="lineno"> 183</span>  <span class="keywordtype">float</span> *out = (<span class="keywordtype">float</span>*)outputBuffer;</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  (void) inputBuffer; <span class="comment">/* Prevent "unused variable" warnings. */</span></div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span> </div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="comment">/* Are we almost at end. */</span></div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="keywordflow">if</span>( data->sampsToGo < framesPerBuffer )</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>  numFrames = data->sampsToGo;</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  finished = 1;</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  }</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  {</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  numFrames = framesPerBuffer;</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  finished = 0;</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>  <span class="keywordflow">for</span>( i=0; i<numFrames; i++ )</div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  {</div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  *out++ = GeneratePinkNoise( &data->leftPink );</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  *out++ = GeneratePinkNoise( &data->rightPink );</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  }</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  data->sampsToGo -= numFrames;</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keywordflow">return</span> finished;</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span> }</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span> </div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span> <span class="comment">/*******************************************************************/</span></div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span> <span class="keywordtype">int</span> main(<span class="keywordtype">void</span>);</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span> <span class="keywordtype">int</span> main(<span class="keywordtype">void</span>)</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span> {</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <a class="code" href="portaudio_8h.html#a19874734f89958fccf86785490d53b4c">PaStream</a>* stream;</div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <a class="code" href="portaudio_8h.html#a4949e4a8ef9f9dbe8cbee414ce69841d">PaError</a> err;</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <a class="code" href="structpaTestData.html">paTestData</a> data;</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  <a class="code" href="structPaStreamParameters.html">PaStreamParameters</a> outputParameters;</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  <span class="keywordtype">int</span> totalSamps;</div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</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="l00216"></a><span class="lineno"> 216</span>  <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> FPB = 2048; <span class="comment">/* Frames per buffer: 46 ms buffers. */</span></div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  </div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  <span class="comment">/* Initialize two pink noise signals with different numbers of rows. */</span></div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  InitializePinkNoise( &data.leftPink, 12 );</div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  InitializePinkNoise( &data.rightPink, 16 );</div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span> </div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  <span class="comment">/* Look at a few values. */</span></div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  {</div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  <span class="keywordtype">int</span> i;</div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  <span class="keywordtype">float</span> pink;</div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  <span class="keywordflow">for</span>( i=0; i<20; i++ )</div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  {</div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  pink = GeneratePinkNoise( &data.leftPink );</div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  printf(<span class="stringliteral">"Pink = %f\n"</span>, pink );</div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  }</div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  }</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span> </div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  data.sampsToGo = totalSamps = (int)(60.0 * SR); <span class="comment">/* Play a whole minute. */</span></div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  err = <a class="code" href="portaudio_8h.html#abed859482d156622d9332dff9b2d89da">Pa_Initialize</a>();</div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  <span class="keywordflow">if</span>( err != paNoError ) <span class="keywordflow">goto</span> error;</div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span> </div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <span class="comment">/* Open a stereo PortAudio stream so we can hear the result. */</span></div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</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="l00239"></a><span class="lineno"> 239</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="l00240"></a><span class="lineno"> 240</span>  fprintf(stderr,<span class="stringliteral">"Error: No default output device.\n"</span>);</div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  <span class="keywordflow">goto</span> error;</div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  }</div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</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="l00244"></a><span class="lineno"> 244</span>  outputParameters.<a class="code" href="structPaStreamParameters.html#aff01b9fa0710ad1654471e97665c06a9">hostApiSpecificStreamInfo</a> = NULL;</div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</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="l00246"></a><span class="lineno"> 246</span>  outputParameters.<a class="code" href="structPaStreamParameters.html#aa1e80ac0551162fd091db8936ccbe9a0">suggestedLatency</a> =</div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  <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="l00248"></a><span class="lineno"> 248</span>  err = <a class="code" href="portaudio_8h.html#a443ad16338191af364e3be988014cbbe">Pa_OpenStream</a>(&stream,</div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  NULL, <span class="comment">/* No input. */</span></div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  &outputParameters,</div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  SR, <span class="comment">/* Sample rate. */</span></div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  FPB, <span class="comment">/* Frames per buffer. */</span></div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  <a class="code" href="portaudio_8h.html#a837b8a81be3f7e36c96003e0d8dcec12">paClipOff</a>, <span class="comment">/* we won't output out of range samples so don't bother clipping them */</span></div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  patestCallback,</div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  &data);</div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  <span class="keywordflow">if</span>( err != paNoError ) <span class="keywordflow">goto</span> error;</div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span> </div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  err = <a class="code" href="portaudio_8h.html#a7432aadd26c40452da12fa99fc1a047b">Pa_StartStream</a>( stream );</div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  <span class="keywordflow">if</span>( err != paNoError ) <span class="keywordflow">goto</span> error;</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>  printf(<span class="stringliteral">"Stereo pink noise for one minute...\n"</span>);</div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span> </div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  <span class="keywordflow">while</span>( ( err = <a class="code" href="portaudio_8h.html#a1f8709c4971932643681a6f374c4bb5a">Pa_IsStreamActive</a>( stream ) ) == 1 ) <a class="code" href="portaudio_8h.html#a1b3c20044c9401c42add29475636e83d">Pa_Sleep</a>(100);</div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  <span class="keywordflow">if</span>( err < 0 ) <span class="keywordflow">goto</span> error;</div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span> </div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  err = <a class="code" href="portaudio_8h.html#a92f56f88cbd14da0e8e03077e835d104">Pa_CloseStream</a>( stream );</div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  <span class="keywordflow">if</span>( err != paNoError ) <span class="keywordflow">goto</span> error;</div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span> <span class="preprocessor">#ifdef PINK_MEASURE</span></div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span> <span class="preprocessor"></span> printf(<span class="stringliteral">"Pink min = %f, max = %f\n"</span>, pinkMin, pinkMax );</div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span> <span class="preprocessor"></span> <a class="code" href="portaudio_8h.html#a0db317604e916e8bd6098e60e6237221">Pa_Terminate</a>();</div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span> error:</div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <a class="code" href="portaudio_8h.html#a0db317604e916e8bd6098e60e6237221">Pa_Terminate</a>();</div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  fprintf( stderr, <span class="stringliteral">"An error occured while using the portaudio stream\n"</span> );</div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  fprintf( stderr, <span class="stringliteral">"Error number: %d\n"</span>, err );</div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</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="l00278"></a><span class="lineno"> 278</span>  <span class="keywordflow">return</span> 0;</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> <span class="preprocessor">#endif </span><span class="comment">/* PINK_TEST */</span><span class="preprocessor"></span></div>
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