AnalogTapeModel

Physical modelling signal processing for analog tape recording
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TapeScope.cpp (2310B)

      1 #include "TapeScope.h"
      2 
      3 using namespace foleys;
      4 
      5 namespace
      6 {
      7 constexpr int rmsMS = 5000; // rms window milliseconds
      8 constexpr float xPad = 3.0f;
      9 } // namespace
     10 
     11 void TapeScope::setNumChannels (int newNumChannels) { numChannels = newNumChannels; }
     12 
     13 void TapeScope::prepareToPlay (double newSampleRate, int samplesPerBlockExpected)
     14 {
     15     MagicOscilloscope::prepareToPlay (newSampleRate, samplesPerBlockExpected);
     16     inputSource.setupSource (numChannels, newSampleRate, rmsMS, rmsMS);
     17     outputSource.setupSource (numChannels, newSampleRate, rmsMS, rmsMS);
     18 }
     19 
     20 void TapeScope::pushSamplesIO (const AudioBuffer<float>& buffer, AudioType type)
     21 {
     22     switch (type)
     23     {
     24         case Input:
     25             inputSource.pushSamples (buffer);
     26             return;
     27 
     28         case Output:
     29             outputSource.pushSamples (buffer);
     30             MagicOscilloscope::pushSamples (buffer);
     31     }
     32 }
     33 
     34 void TapeScope::createPlotPaths (Path& path, Path& filledPath, Rectangle<float> bounds, MagicPlotComponent& component)
     35 {
     36     // plot normal scope, with no fill
     37     MagicOscilloscope::createPlotPaths (path, filledPath, bounds, component);
     38     filledPath.clear();
     39 
     40     // get strings for I/O dB meters
     41     auto getDBString = [] (const MagicLevelSource& source, AudioType type) -> String
     42     {
     43         String prefix = type == Input ? "IN: " : "OUT: ";
     44         auto dBVal = Decibels::gainToDecibels (source.getRMSvalue (0), -80.0f);
     45         return prefix + String (dBVal, 1) + " dB";
     46     };
     47 
     48     String inputMeter = getDBString (inputSource, Input);
     49     String outputMeter = getDBString (outputSource, Output);
     50 
     51     // draw label text
     52     const auto b = bounds.toFloat();
     53     const auto labelHeight = b.getProportion (Rectangle<float> { 0.0f, 0.2f }).getHeight();
     54     const auto fontHeight = labelHeight * 0.9f;
     55     const auto font = Font (fontHeight);
     56 
     57     auto drawLabel = [b, &filledPath, labelHeight, font] (const String& textStr, float x)
     58     {
     59         auto width = font.getStringWidthFloat (textStr);
     60         x = x < b.getCentreX() ? x : x - width;
     61 
     62         GlyphArrangement text;
     63         text.addFittedText (font, textStr, x, b.getY(), width, labelHeight, Justification::left, 1);
     64         text.createPath (filledPath);
     65     };
     66 
     67     drawLabel (inputMeter, b.getX() + xPad);
     68     drawLabel (outputMeter, b.getRight() - xPad);
     69 }