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<div class="headertitle"><div class="title">RealtimeResampler.h</div></div>
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<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">/*</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment"> ==============================================================================</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment"> </span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment"> This file is part of the iPlug 2 library. Copyright (C) the iPlug 2 developers.</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment"> </span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="comment"> See LICENSE.txt for more info.</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="comment"> </span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="comment"> ==============================================================================</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="comment">*/</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span> </div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="preprocessor">#pragma once</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span> </div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="preprocessor">#include <functional></span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="preprocessor">#include <cmath></span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span> </div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="preprocessor">#include "<a class="code" href="_i_plug_platform_8h.html">IPlugPlatform.h</a>"</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="preprocessor">#include "LanczosResampler.h"</span></div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span> </div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="preprocessor">#include "heapbuf.h"</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="preprocessor">#include "ptrlist.h"</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span> </div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span>BEGIN_IPLUG_NAMESPACE</div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span> </div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span><span class="keyword">template</span><<span class="keyword">typename</span> T = <span class="keywordtype">double</span>, <span class="keywordtype">int</span> NCHANS=2, <span class="keywordtype">size_t</span> A=12></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"><a class="line" href="class_realtime_resampler.html"> 44</a></span><span class="keyword">class </span><a class="code hl_class" href="class_realtime_resampler.html">RealtimeResampler</a></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span>{</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> <span class="keyword">static_assert</span>(std::is_same<T, float>::value || std::is_same<T, double>::value, <span class="stringliteral">"T must be float or double"</span>);</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> </div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span><span class="keyword">public</span>:</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> <span class="keyword">enum class</span> ESRCMode</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> {</div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> kLinearInterpolation = 0,</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> kLancsoz,</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> kNumResamplingModes</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> };</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> </div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> <span class="keyword">using </span>BlockProcessFunc = std::function<void(T**, T**, <span class="keywordtype">int</span>, <span class="keywordtype">int</span>)>;</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> <span class="keyword">using </span>LanczosResampler = LanczosResampler<T, NCHANS, A>;</div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> </div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"><a class="line" href="class_realtime_resampler.html#a922f9338099dca2de6109f21e88d13f3"> 63</a></span> <a class="code hl_function" href="class_realtime_resampler.html#a922f9338099dca2de6109f21e88d13f3">RealtimeResampler</a>(<span class="keywordtype">double</span> innerSampleRate, ESRCMode mode = ESRCMode::kLancsoz)</div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> : mResamplingMode(mode)</div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> , mInnerSampleRate(innerSampleRate)</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> {</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> }</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> </div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> <a class="code hl_class" href="class_realtime_resampler.html">RealtimeResampler</a>(<span class="keyword">const</span> <a class="code hl_class" href="class_realtime_resampler.html">RealtimeResampler</a>&) = <span class="keyword">delete</span>;</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> <a class="code hl_class" href="class_realtime_resampler.html">RealtimeResampler</a>& operator=(<span class="keyword">const</span> <a class="code hl_class" href="class_realtime_resampler.html">RealtimeResampler</a>&) = <span class="keyword">delete</span>;</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> </div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"><a class="line" href="class_realtime_resampler.html#a9e1ac3bc93ee97d6f2fb8a23c12bec8b"> 76</a></span> <span class="keywordtype">void</span> <a class="code hl_function" href="class_realtime_resampler.html#a9e1ac3bc93ee97d6f2fb8a23c12bec8b">Reset</a>(<span class="keywordtype">double</span> inputSampleRate, <span class="keywordtype">int</span> maxBlockSize = DEFAULT_BLOCK_SIZE)</div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> {</div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> mOuterSampleRate = inputSampleRate;</div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> mInRatio = mOuterSampleRate / mInnerSampleRate;</div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> mOutRatio = mInnerSampleRate / mOuterSampleRate;</div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> mMaxOuterLength = maxBlockSize;</div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> mMaxInnerLength = CalculateMaxInnerLength(mMaxOuterLength);</div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> </div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> mInputData.Resize(mMaxInnerLength * NCHANS);</div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> mOutputData.Resize(mMaxInnerLength * NCHANS);</div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> mInputPtrs.Empty();</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> mOutputPtrs.Empty();</div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> </div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> <span class="keywordflow">for</span> (<span class="keyword">auto</span> chan=0; chan<NCHANS; chan++)</div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> {</div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> mInputPtrs.Add(mInputData.Get() + (chan * mMaxInnerLength));</div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> mOutputPtrs.Add(mOutputData.Get() + (chan * mMaxInnerLength));</div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> }</div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> </div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> ClearBuffers();</div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> </div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span> <span class="keywordflow">if</span> (mResamplingMode == ESRCMode::kLancsoz)</div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> {</div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span> <span class="keyword">const</span> T outerRate = <span class="keyword">static_cast<</span>T<span class="keyword">></span>(mOuterSampleRate);</div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> <span class="keyword">const</span> T innerRate = <span class="keyword">static_cast<</span>T<span class="keyword">></span>(mInnerSampleRate);</div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> mInResampler = std::make_unique<LanczosResampler>(outerRate, innerRate);</div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> mOutResampler = std::make_unique<LanczosResampler>(innerRate, outerRate);</div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> </div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span> <span class="comment">// Warm up the resamplers with enough silence that the first real buffer can yield the required number of output samples.</span></div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span> <span class="keyword">const</span> <span class="keyword">auto</span> outSamplesRequired = mOutResampler->GetNumSamplesRequiredFor(1);</div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span> <span class="keyword">const</span> <span class="keyword">auto</span> inSamplesRequired = mInResampler->GetNumSamplesRequiredFor(outSamplesRequired);</div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span> mInResampler->PushBlock(mInputPtrs.GetList(), inSamplesRequired, NCHANS);</div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span> <span class="keyword">const</span> <span class="keyword">auto</span> populated = mInResampler->PopBlock(mInputPtrs.GetList(), outSamplesRequired, NCHANS);</div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span> assert(populated >= outSamplesRequired && <span class="stringliteral">"Didn't get enough samples required for warm up!"</span>);</div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> mOutResampler->PushBlock(mOutputPtrs.GetList(), populated, NCHANS);</div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> </div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> <span class="comment">// magic number that we seem to need to align when compensating for latency</span></div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span> <span class="keyword">constexpr</span> <span class="keyword">auto</span> addedLatency = 2;</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span> mLatency = <span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(inSamplesRequired + addedLatency);</div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span> }</div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> <span class="keywordflow">else</span></div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span> {</div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span> mLatency = 0;</div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span> }</div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span> }</div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span> </div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"><a class="line" href="class_realtime_resampler.html#a80853116ab3b0f3f7bf61afc99930f1f"> 128</a></span> <span class="keywordtype">void</span> <a class="code hl_function" href="class_realtime_resampler.html#a80853116ab3b0f3f7bf61afc99930f1f">ProcessBlock</a>(T** inputs, T** outputs, <span class="keywordtype">int</span> nFrames, <span class="keywordtype">int</span> nChans, BlockProcessFunc func)</div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span> {</div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span> <span class="keywordflow">if</span> (mInnerSampleRate == mOuterSampleRate) <span class="comment">// nothing to do!</span></div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno"> 131</span> {</div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"> 132</span> func(inputs, outputs, nFrames, nChans);</div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno"> 133</span> <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno"> 134</span> }</div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span> </div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span> <span class="keywordflow">switch</span> (mResamplingMode)</div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span> {</div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"> 138</span> <span class="keywordflow">case</span> ESRCMode::kLinearInterpolation:</div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span> {</div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span> <span class="keyword">const</span> <span class="keyword">auto</span> nNewFrames = LinearInterpolate(inputs, mInputPtrs.GetList(), nFrames, nChans, mInRatio, mMaxInnerLength);</div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span> func(mInputPtrs.GetList(), mOutputPtrs.GetList(), nNewFrames, nChans);</div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span> LinearInterpolate(mOutputPtrs.GetList(), outputs, nNewFrames, nChans, mOutRatio, nFrames);</div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span> <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"> 144</span> }</div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno"> 145</span> <span class="keywordflow">case</span> ESRCMode::kLancsoz:</div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno"> 146</span> {</div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno"> 147</span> mInResampler->PushBlock(inputs, nFrames, nChans);</div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno"> 148</span> <span class="keyword">const</span> <span class="keyword">auto</span> maxInnerLength = CalculateMaxInnerLength(nFrames);</div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno"> 149</span> </div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"> 150</span> <span class="keywordflow">while</span> (mInResampler->GetNumSamplesRequiredFor(1) == 0) <span class="comment">// i.e. there's signal still available to pop</span></div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"> 151</span> {</div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"> 152</span> <span class="keyword">const</span> <span class="keyword">auto</span> populated = mInResampler->PopBlock(mInputPtrs.GetList(), maxInnerLength, nChans);</div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span> assert(populated <= maxInnerLength && <span class="stringliteral">"Received more samples than the encapsulated DSP is able to handle!"</span>);</div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"> 154</span> func(mInputPtrs.GetList(), mOutputPtrs.GetList(), <span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(populated), nChans);</div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno"> 155</span> mOutResampler->PushBlock(mOutputPtrs.GetList(), populated, nChans);</div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"> 156</span> }</div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno"> 157</span> </div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno"> 158</span><span class="preprocessor">#ifdef _DEBUG</span></div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno"> 159</span> <span class="keyword">const</span> <span class="keyword">auto</span> populated =</div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno"> 160</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno"> 161</span> mOutResampler->PopBlock(outputs, nFrames, nChans);</div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno"> 162</span> assert(populated >= nFrames && <span class="stringliteral">"Did not yield enough samples to provide the required output buffer!"</span>);</div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno"> 163</span> </div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno"> 164</span> mInResampler->RenormalizePhases();</div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno"> 165</span> mOutResampler->RenormalizePhases();</div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno"> 166</span> <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno"> 167</span> }</div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno"> 168</span> <span class="keywordflow">default</span>:</div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno"> 169</span> <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno"> 170</span> }</div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno"> 171</span> }</div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno"> 172</span> </div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno"><a class="line" href="class_realtime_resampler.html#a36586e4f136db4842819f04b0eb85b6e"> 174</a></span> <span class="keywordtype">int</span> <a class="code hl_function" href="class_realtime_resampler.html#a36586e4f136db4842819f04b0eb85b6e">GetLatency</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> mLatency; }</div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno"> 175</span> </div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno"> 176</span><span class="keyword">private</span>:</div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno"> 178</span> <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">int</span> LinearInterpolate(T** inputs, T** outputs, <span class="keywordtype">int</span> inputLength, <span class="keywordtype">int</span> nChans, <span class="keywordtype">double</span> ratio, <span class="keywordtype">int</span> maxOutputLength)</div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno"> 179</span> {</div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno"> 180</span> <span class="keyword">const</span> <span class="keyword">auto</span> outputLength =</div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno"> 181</span> std::min(<span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(std::ceil(<span class="keyword">static_cast<</span><span class="keywordtype">double</span><span class="keyword">></span>(inputLength) / ratio)), maxOutputLength);</div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno"> 182</span> </div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno"> 183</span> <span class="keywordflow">for</span> (<span class="keyword">auto</span> writePos=0; writePos<outputLength; writePos++)</div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno"> 184</span> {</div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno"> 185</span> <span class="keyword">const</span> <span class="keyword">auto</span> readPos = ratio * <span class="keyword">static_cast<</span><span class="keywordtype">double</span><span class="keyword">></span>(writePos);</div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno"> 186</span> <span class="keyword">const</span> <span class="keyword">auto</span> readPostionTrunc = std::floor(readPos);</div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno"> 187</span> <span class="keyword">const</span> <span class="keyword">auto</span> readPosInt = <span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(readPostionTrunc);</div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno"> 188</span> </div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno"> 189</span> <span class="keywordflow">if</span> (readPosInt < inputLength)</div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno"> 190</span> {</div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno"> 191</span> <span class="keyword">const</span> T y = <span class="keyword">static_cast<</span>T<span class="keyword">></span>(readPos - readPostionTrunc); <span class="comment">// Cast to T to avoid precision warning</span></div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno"> 192</span> </div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno"> 193</span> <span class="keywordflow">for</span> (<span class="keyword">auto</span> chan=0; chan<nChans; chan++)</div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno"> 194</span> {</div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno"> 195</span> <span class="keyword">const</span> T x0 = inputs[chan][readPosInt];</div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno"> 196</span> <span class="keyword">const</span> T x1 = ((readPosInt + 1) < inputLength) ? inputs[chan][readPosInt + 1] </div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno"> 197</span> : inputs[chan][readPosInt - 1];</div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno"> 198</span> outputs[chan][writePos] = (T(1) - y) * x0 + y * x1;</div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno"> 199</span> }</div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno"> 200</span> }</div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno"> 201</span> }</div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno"> 202</span> </div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno"> 203</span> <span class="keywordflow">return</span> outputLength;</div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno"> 204</span> }</div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno"> 205</span> </div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno"> 207</span> <span class="keywordtype">void</span> ClearBuffers()</div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno"> 208</span> {</div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno"> 209</span> <span class="keyword">const</span> <span class="keyword">auto</span> nBytes = mMaxInnerLength * NCHANS * <span class="keyword">sizeof</span>(T);</div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno"> 210</span> memset(mInputData.Get(), 0, nBytes);</div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno"> 211</span> memset(mOutputData.Get(), 0, nBytes);</div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno"> 212</span> }</div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno"> 213</span> </div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno"> 215</span> <span class="keywordtype">int</span> CalculateMaxInnerLength(<span class="keyword">const</span> <span class="keywordtype">int</span> outerLength)<span class="keyword"> const</span></div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno"> 216</span><span class="keyword"> </span>{</div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno"> 217</span> <span class="keywordflow">return</span> <span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(std::ceil(<span class="keywordtype">double</span>(outerLength) / mInRatio));</div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno"> 218</span> }</div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno"> 219</span> </div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno"> 220</span> WDL_TypedBuf<T> mInputData, mOutputData;</div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno"> 221</span> WDL_PtrList<T> mInputPtrs, mOutputPtrs;</div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno"> 222</span> <span class="keywordtype">double</span> mInRatio = 0.0, mOutRatio = 0.0;</div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno"> 223</span> <span class="keywordtype">double</span> mOuterSampleRate = DEFAULT_SAMPLE_RATE;</div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno"> 224</span> <span class="keyword">const</span> <span class="keywordtype">double</span> mInnerSampleRate;</div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno"> 225</span> <span class="keywordtype">int</span> mMaxOuterLength = 0; <span class="comment">// The maximum outer block size expected</span></div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno"> 226</span> <span class="keywordtype">int</span> mMaxInnerLength = 0; <span class="comment">// The computed maximum inner block size</span></div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno"> 227</span> <span class="keywordtype">int</span> mLatency = 0;</div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno"> 228</span> <span class="keyword">const</span> ESRCMode mResamplingMode;</div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno"> 229</span> std::unique_ptr<LanczosResampler> mInResampler, mOutResampler;</div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno"> 230</span>} WDL_FIXALIGN;</div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno"> 231</span> </div>
<div class="line"><a id="l00232" name="l00232"></a><span class="lineno"> 232</span>END_IPLUG_NAMESPACE</div>
<div class="ttc" id="a_i_plug_platform_8h_html"><div class="ttname"><a href="_i_plug_platform_8h.html">IPlugPlatform.h</a></div><div class="ttdoc">Include to get consistently named preprocessor macros for different platforms and logging functionali...</div></div>
<div class="ttc" id="aclass_realtime_resampler_html"><div class="ttname"><a href="class_realtime_resampler.html">RealtimeResampler</a></div><div class="ttdoc">A multi-channel real-time resampling container that can be used to resample audio processing to a spe...</div><div class="ttdef"><b>Definition:</b> <a href="_realtime_resampler_8h_source.html#l00044">RealtimeResampler.h:45</a></div></div>
<div class="ttc" id="aclass_realtime_resampler_html_a36586e4f136db4842819f04b0eb85b6e"><div class="ttname"><a href="class_realtime_resampler.html#a36586e4f136db4842819f04b0eb85b6e">RealtimeResampler::GetLatency</a></div><div class="ttdeci">int GetLatency() const</div><div class="ttdoc">Get the latency of the resampling, not including any latency of the encapsulated DSP.</div><div class="ttdef"><b>Definition:</b> <a href="_realtime_resampler_8h_source.html#l00174">RealtimeResampler.h:174</a></div></div>
<div class="ttc" id="aclass_realtime_resampler_html_a80853116ab3b0f3f7bf61afc99930f1f"><div class="ttname"><a href="class_realtime_resampler.html#a80853116ab3b0f3f7bf61afc99930f1f">RealtimeResampler::ProcessBlock</a></div><div class="ttdeci">void ProcessBlock(T **inputs, T **outputs, int nFrames, int nChans, BlockProcessFunc func)</div><div class="ttdoc">Resample an input block with a per-block function (resample input -> process with function -> resampl...</div><div class="ttdef"><b>Definition:</b> <a href="_realtime_resampler_8h_source.html#l00128">RealtimeResampler.h:128</a></div></div>
<div class="ttc" id="aclass_realtime_resampler_html_a922f9338099dca2de6109f21e88d13f3"><div class="ttname"><a href="class_realtime_resampler.html#a922f9338099dca2de6109f21e88d13f3">RealtimeResampler::RealtimeResampler</a></div><div class="ttdeci">RealtimeResampler(double innerSampleRate, ESRCMode mode=ESRCMode::kLancsoz)</div><div class="ttdoc">Constructor.</div><div class="ttdef"><b>Definition:</b> <a href="_realtime_resampler_8h_source.html#l00063">RealtimeResampler.h:63</a></div></div>
<div class="ttc" id="aclass_realtime_resampler_html_a9e1ac3bc93ee97d6f2fb8a23c12bec8b"><div class="ttname"><a href="class_realtime_resampler.html#a9e1ac3bc93ee97d6f2fb8a23c12bec8b">RealtimeResampler::Reset</a></div><div class="ttdeci">void Reset(double inputSampleRate, int maxBlockSize=DEFAULT_BLOCK_SIZE)</div><div class="ttdoc">Reset the underlying DSP (when the samplerate or max expected block size changes)</div><div class="ttdef"><b>Definition:</b> <a href="_realtime_resampler_8h_source.html#l00076">RealtimeResampler.h:76</a></div></div>
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