Hi all
I am working on my first project, a pitch tracker, and found a nice looking library to use: http://www.schmittmachine.com/dywapitchtrack.html
I have use the LiveScrollingAudioDisplay class from the Juce Demo as a starting point, to learn about live sampling of audio input. I managed to extract that class into a seperate project and get it working. However it is only a header file with definitions inside.. I'm not sure the reason for this.
I am having troubles getting the dywapitchtrack library working. When I use the 'dywapitch_computepitch' function I get a 'No matching function for call' error. However, I have included the header file, and can navigate to it by ctrl-click and 'Jump to definition'.
My code is below if anyone feels like having a look.
Thanks in advance!
#include "dywapitchtrack.h"
//==============================================================================
/* This component scrolls a continuous waveform showing the audio that's
coming into whatever audio inputs this object is connected to.
Copied from Juce demo.
*/
class LiveScrollingAudioDisplay : public Component,
public AudioIODeviceCallback,
public dywapitchtracker,
private Timer
{
public:
LiveScrollingAudioDisplay()
: nextSample (0), subSample (0), accumulator (0)
{
setOpaque (true);
clear();
startTimer (1000 / 75); // use a timer to keep repainting this component
dywapitch_inittracking (&pitchtracker);
}
//==============================================================================
void audioDeviceAboutToStart (AudioIODevice*) override
{
clear();
}
void audioDeviceStopped() override
{
clear();
}
void audioDeviceIOCallback (const float** inputChannelData, int numInputChannels,
float** outputChannelData, int numOutputChannels,
int numSamples) override
{
for (int i = 0; i < numSamples; ++i)
{
float inputSample = 0;
for (int chan = 0; chan < numInputChannels; ++chan)
if (inputChannelData[chan] != nullptr)
inputSample += std::abs (inputChannelData[chan][i]); // find the sum of all the channels <-- might not want to do this...
psamples[i] = inputSample;
pushSample (5.0f * inputSample); // boost the level to make it more easily visible.
}
// We need to clear the output buffers before returning, in case they're full of junk..
for (int j = 0; j < numOutputChannels; ++j)
if (outputChannelData[j] != nullptr)
zeromem (outputChannelData[j], sizeof (float) * (size_t) numSamples);
}
private:
static const int bufferSize = 1024;
float samples[bufferSize];
float psamples[bufferSize];
double currentPitch;
int nextSample, subSample;
float accumulator;
dywapitchtracker pitchtracker;
void clear()
{
zeromem (samples, sizeof (samples));
accumulator = 0;
subSample = 0;
}
void paint (Graphics& g) override
{
g.fillAll (Colours::black);
const float midY = getHeight() * 0.5f;
int samplesAgo = (nextSample + numElementsInArray (samples) - 1);
RectangleList<float> waveform;
for (int x = jmin (getWidth(), (int) numElementsInArray (samples)); --x >= 0;)
{
const float sampleSize = midY * samples [samplesAgo-- % numElementsInArray (samples)];
waveform.addWithoutMerging (Rectangle<float> ((float) x, midY - sampleSize, 1.0f, sampleSize * 2.0f));
}
currentPitch = dywapitch_computepitch(&pitchtracker, psamples, 0, 1024);
g.drawText((String)currentPitch, 1, 1, 50, 15, Justification::topLeft, true);
g.setColour (Colours::lightgreen);
g.fillRectList (waveform);
}
void timerCallback() override
{
repaint();
}
void pushSample (const float newSample)
{
accumulator += newSample;
if (subSample == 0)
{
const int inputSamplesPerPixel = 200;
samples[nextSample] = accumulator / inputSamplesPerPixel;
nextSample = (nextSample + 1) % numElementsInArray (samples);
subSample = inputSamplesPerPixel;
accumulator = 0;
}
else
{
--subSample;
}
}
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (LiveScrollingAudioDisplay);
};