// Creates sine wave
void KissBasicApp::sineWave( uint64_t inSampleOffset, uint32_t ioSampleCount, audio::Buffer32f * ioBuffer )
{
// Fill buffer with sine wave
mPhaseAdjust = mPhaseAdjust * 0.95f + ( mFreqTarget / 44100.0f ) * 0.05f;
for ( uint32_t i = 0; i < ioSampleCount; i++ ) {
mPhase += mPhaseAdjust;
mPhase = mPhase - math<float>::floor( mPhase );
float val = math<float>::sin( mPhase * 2.0f * (float)M_PI ) * mAmplitude;
ioBuffer->mData[ i * ioBuffer->mNumberChannels ] = val;
ioBuffer->mData[ i * ioBuffer->mNumberChannels + 1 ] = val;
}
// Initialize analyzer
if ( !mFft ) {
mFft = Kiss::create( ioSampleCount );
}
// Analyze data
mFft->setData( ioBuffer->mData );
}
void PixarDemo2012::update()
{
if ( mFullScreen != isFullScreen() ) {
setFullScreen(mFullScreen);
// mCamera->setAspectRatio(getWindowAspectRatio());
// mySurface = cairo::SurfaceImage(getWindowWidth(),getWindowHeight(),true);
if ( isFullScreen() == true ) {
hideCursor();
} else {
showCursor();
}
}
mTime += 0.01f;
float kFudge = 0.1; // ten times our step
if(mAutoCut && mTime > mCuts[mCurrentCut] && mTime < mCuts[mCurrentCut] + kFudge )
{
doFade = true;
mCurrentCut = mCurrentCut + 1;
if(mCurrentCut >= mCuts.size())
{
mCurrentCut = mCuts.size()-1;
}
}
mParticleController.update();
if ( drawTitle ) {
theTitle.Update();
}
if ( drawCloth ) {
theCloth.Update( );
}
if ( drawCubes ) {
theCubes.Update();
}
if ( drawMindField ) {
theMindField.Update();
}
// Check if track is playing and has a PCM buffer available
if ( mTrack->isPlaying() && mTrack->isPcmBuffering() ) {
// Get buffer
mBuffer = mTrack->getPcmBuffer();
if ( mBuffer && mBuffer->getInterleavedData() ) {
// Get sample count
uint32_t sampleCount = mBuffer->getInterleavedData()->mSampleCount;
if ( sampleCount > 0 ) {
// Initialize analyzer
if ( !mFft ) {
mFft = Kiss::create( sampleCount );
}
// Analyze data
if ( mBuffer->getInterleavedData()->mData != 0 ) {
mFft->setData( mBuffer->getInterleavedData()->mData );
}
}
}
}
}
// Runs update logic
void KissTempoApp::update()
{
// Don't evaluate right away or unrealistically
// high numbers will pop up
if ( getElapsedSeconds() < 0.5 ) {
return;
}
// Check if track is playing and has a PCM buffer available
if ( mTrack && mTrack->isPlaying() && mTrack->isPcmBuffering() ) {
// Get buffer
mBuffer = mTrack->getPcmBuffer();
if ( mBuffer && mBuffer->getInterleavedData() ) {
// Get sample count
uint32_t sampleCount = mBuffer->getInterleavedData()->mSampleCount;
if ( sampleCount > 0 ) {
// Kiss is not initialized
if ( !mFft ) {
// Initialize analyzer
mFft = Kiss::create( sampleCount );
// Set filter on FFT to calculate tempo based on beats
mFft->setFilter( 0.2f, Kiss::Filter::LOW_PASS );
}
// Analyze data
if ( mBuffer->getInterleavedData()->mData != 0 ) {
// Set FFT data
mInputData = mBuffer->getInterleavedData()->mData;
mInputSize = mBuffer->getInterleavedData()->mSampleCount;
mFft->setData( mInputData );
// Get data
mTimeData = mFft->getData();
mDataSize = mFft->getBinSize();
// Iterate through amplitude data
for ( int32_t i = 0; i < mDataSize; i++, mSampleDistance++ ) {
// Check value against threshold
if ( mTimeData[ i ] >= mThreshold ) {
// Determine neighbor range
int32_t start = math<int32_t>::max( i - mNeighbors, 0 );
int32_t end = math<int32_t>::min( i + mNeighbors, mDataSize - 1 );
// Compare this value with neighbors to find peak
bool peak = true;
for ( int32_t j = start; j < end; j++ ) {
if ( j != i && mTimeData[ i ] <= mTimeData[ j ] ) {
peak = false;
break;
}
}
// This is a peak
if ( peak ) {
// Add distance between this peak and last into the
// list. Just note position if this is the first peak.
if ( mFirstPeak >= 0 ) {
mPeakDistances.push_back( mSampleDistance );
} else {
mFirstPeak = mSampleDistance;
}
// Reset distance counter
mSampleDistance = 0;
}
}
}
}
}
// We have multiple peaks to compare
if ( mPeakDistances.size() > 1 ) {
// Add distances
int32_t total = 0;
uint32_t peakCount = mPeakDistances.size();
for ( uint32_t i = 0; i < peakCount; i++ ) {
total += mPeakDistances[ i ];
}
// Determine tempo based on average peak distance
mTempo = total > 0 ? ( 44100.0f / ( (float)total / (float)mPeakDistances.size() ) ) * 60.0f / 1000.0f : 0.0f;
}
// Get current window height
int32_t windowHeight = getWindowHeight() / 8;
// Add up values, combine input and filtered values
// to emphasize bass
float total = 0.0f;
for ( int32_t i = 0; i < mDataSize; i++ ) {
if ( i * 8 < mInputSize ) {
total += mTimeData[ i ] * 2.0f * mInputData[ i * 8 ];
}
}
// Add average to drawing line
mWaveform.push_back( total / (float)mDataSize );
// Remove points when vector is wider than screen
while ( mWaveform.size() >= (uint32_t)windowHeight ) {
mWaveform.erase( mWaveform.begin() );
}
}
}
}