void EqAnalyser::analyze( sampleFrame *buf, const fpp_t frames )
{
//only analyse if the view is visible
if ( m_active )
{
m_inProgress=true;
const int FFT_BUFFER_SIZE = 2048;
fpp_t f = 0;
if( frames > FFT_BUFFER_SIZE )
{
m_framesFilledUp = 0;
f = frames - FFT_BUFFER_SIZE;
}
// meger channels
for( ; f < frames; ++f )
{
m_buffer[m_framesFilledUp] =
( buf[f][0] + buf[f][1] ) * 0.5;
++m_framesFilledUp;
}
if( m_framesFilledUp < FFT_BUFFER_SIZE )
{
m_inProgress = false;
return;
}
m_sampleRate = Engine::mixer()->processingSampleRate();
const int LOWEST_FREQ = 0;
const int HIGHEST_FREQ = m_sampleRate / 2;
fftwf_execute( m_fftPlan );
absspec( m_specBuf, m_absSpecBuf, FFT_BUFFER_SIZE+1 );
compressbands( m_absSpecBuf, m_bands, FFT_BUFFER_SIZE+1,
MAX_BANDS,
( int )( LOWEST_FREQ * ( FFT_BUFFER_SIZE + 1 ) / ( float )( m_sampleRate / 2 ) ),
( int )( HIGHEST_FREQ * ( FFT_BUFFER_SIZE + 1) / ( float )( m_sampleRate / 2 ) ) );
m_energy = maximum( m_bands, MAX_BANDS ) / maximum( m_buffer, FFT_BUFFER_SIZE );
m_framesFilledUp = 0;
m_inProgress = false;
m_active = false;
}
}
bool SpectrumAnalyzer::processAudioBuffer( sampleFrame* _buf, const fpp_t _frames )
{
if( !isEnabled() || !isRunning () )
{
return false;
}
if( !m_saControls.isViewVisible() )
{
return true;
}
fpp_t f = 0;
if( _frames > FFT_BUFFER_SIZE )
{
m_framesFilledUp = 0;
f = _frames - FFT_BUFFER_SIZE;
}
const int cm = m_saControls.m_channelMode.value();
switch( cm )
{
case MergeChannels:
for( ; f < _frames; ++f )
{
m_buffer[m_framesFilledUp] =
( _buf[f][0] + _buf[f][1] ) * 0.5;
++m_framesFilledUp;
}
break;
case LeftChannel:
for( ; f < _frames; ++f )
{
m_buffer[m_framesFilledUp] = _buf[f][0];
++m_framesFilledUp;
}
break;
case RightChannel:
for( ; f < _frames; ++f )
{
m_buffer[m_framesFilledUp] = _buf[f][1];
++m_framesFilledUp;
}
break;
}
if( m_framesFilledUp < FFT_BUFFER_SIZE )
{
return isRunning();
}
// hanming( m_buffer, FFT_BUFFER_SIZE, HAMMING );
const sample_rate_t sr = Engine::mixer()->processingSampleRate();
const int LOWEST_FREQ = 0;
const int HIGHEST_FREQ = sr / 2;
fftwf_execute( m_fftPlan );
absspec( m_specBuf, m_absSpecBuf, FFT_BUFFER_SIZE+1 );
if( m_saControls.m_linearSpec.value() )
{
compressbands( m_absSpecBuf, m_bands, FFT_BUFFER_SIZE+1,
MAX_BANDS,
(int)(LOWEST_FREQ*(FFT_BUFFER_SIZE+1)/(float)(sr/2)),
(int)(HIGHEST_FREQ*(FFT_BUFFER_SIZE+1)/(float)(sr/2)));
m_energy = maximum( m_bands, MAX_BANDS ) / maximum( m_buffer, FFT_BUFFER_SIZE );
}
else
{
calc13octaveband31( m_absSpecBuf, m_bands, FFT_BUFFER_SIZE+1, sr/2.0 );
m_energy = signalpower( m_buffer, FFT_BUFFER_SIZE ) / maximum( m_buffer, FFT_BUFFER_SIZE );
}
m_framesFilledUp = 0;
checkGate( 1 );
return isRunning();
}
