//*********************************************************************************
void BeatDetectorApp::Init( uint32_t mSampleCount )
{
mFftInit = true;
mFft.setDataSize(mSampleCount);
int num_bins = mFft.getBinSize();
CSoundAnalyzer::StaticInit(num_bins, samples_per_frame);
for(int i=0; i<5; i++)
{
float i_f = i/(float)5 - 0.4f;
m_Cirlces.push_back(Circle(Color(1, 0, 0), 0, Vec2f(0, getWindowHeight() * i_f)));
}
}
// Draw
void KissFileSampleApp::draw()
{
// Clear screen
gl::clear(Color(0.0f, 0.0f, 0.0f));
// Check init flag
if (mFftInit)
{
// Get data
float * mFreqData = mFft.getAmplitude();
float * mTimeData = mFft.getData();
int32_t mDataSize = mFft.getBinSize();
// Get dimensions
float mScale = ((float)getWindowWidth() - 20.0f) / (float)mDataSize;
float mWindowHeight = (float)getWindowHeight();
// Use polylines to depict time and frequency domains
PolyLine<Vec2f> mFreqLine;
PolyLine<Vec2f> mTimeLine;
// Iterate through data
for (int32_t i = 0; i < mDataSize; i++)
{
// Do logarithmic plotting for frequency domain
double mLogSize = log((double)mDataSize);
float x = (float)(log((double)i) / mLogSize) * (double)mDataSize;
float y = math<float>::clamp(mFreqData[i] * (x / mDataSize) * log((double)(mDataSize - i)), 0.0f, 2.0f);
// Plot points on lines
mFreqLine.push_back(Vec2f(x * mScale + 10.0f, -y * (mWindowHeight - 20.0f) * 1.25f + (mWindowHeight - 10.0f)));
mTimeLine.push_back(Vec2f(i * mScale + 10.0f, mTimeData[i] * (mWindowHeight - 20.0f) * 0.3f + (mWindowHeight * 0.15f + 10.0f)));
}
// Draw signals
gl::draw(mFreqLine);
gl::draw(mTimeLine);
}
}