Method processAudioBuffer

plugins/MultitapEcho/MultitapEcho.cpp:92–160

bool MultitapEchoEffect::processAudioBuffer( sampleFrame * buf, const fpp_t frames )
{
	if( !isEnabled() || !isRunning () )
	{
		return( false );
	}
	
	double outSum = 0.0;
	const float d = dryLevel();
	const float w = wetLevel();

	// get processing vars
	const int steps = m_controls.m_steps.value();
	const float stepLength = m_controls.m_stepLength.value();
	const float dryGain = dbfsToAmp( m_controls.m_dryGain.value() );
	const bool swapInputs = m_controls.m_swapInputs.value();
	
	// check if number of stages has changed
	if( m_controls.m_stages.isValueChanged() )
	{
		m_stages = static_cast<int>( m_controls.m_stages.value() );
		updateFilters( 0, steps - 1 );
	}
	
	// add dry buffer - never swap inputs for dry
	m_buffer.writeAddingMultiplied( buf, 0, frames, dryGain );
	
	// swapped inputs?
	if( swapInputs )
	{
		float offset = stepLength;
		for( int i = 0; i < steps; ++i ) // add all steps swapped
		{
			for( int s = 0; s < m_stages; ++s )
			{
				runFilter( m_work, buf, m_filter[i][s], frames );
			}
			m_buffer.writeSwappedAddingMultiplied( m_work, offset, frames, m_amp[i] );
			offset += stepLength;
		}
	}
	else
	{
		float offset = stepLength;
		for( int i = 0; i < steps; ++i ) // add all steps
		{
			for( int s = 0; s < m_stages; ++s )
			{
				runFilter( m_work, buf, m_filter[i][s], frames );
			}
			m_buffer.writeAddingMultiplied( m_work, offset, frames, m_amp[i] );
			offset += stepLength;
		}
	}
	
	// pop the buffer and mix it into output
	m_buffer.pop( m_work );