Method processAudioBuffer

plugins/SpectrumAnalyzer/SpectrumAnalyzer.cpp:75–156

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;