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Back to block processing, more efficient and does not introduce delay

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This commit is contained in:
Geoffrey Merck 2020-04-04 16:16:46 +02:00
parent 1770dc188f
commit 042188770b
9 changed files with 85 additions and 57 deletions
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40
ambed/cagc.cpp
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@ -62,27 +62,33 @@ float CAGC::GetGain()
////////////////////////////////////////////////////////////////////////////////////////
// process
inline float CAGC::ProcessSample(float input)
inline void CAGC::ProcessSampleBlock(uint8* voice, int length)
{
//apply AGC
// apply gain to input sample
float output = input * m_Gain;
for(int i = 0; i < length; i += 2)
{
float input = (float)(short)MAKEWORD(voice[i+1], voice[i]);
//apply AGC
// apply gain to input sample
float output = input * m_Gain;
// compute output signal energy, scaled to 0 to 1
float instantEnergy = abs(output) / m_targetEnergy;
// compute output signal energy, scaled to 0 to 1
float instantEnergy = abs(output) / m_targetEnergy;
// smooth energy estimate using single-pole low-pass filter
m_EnergyPrime = (1.0f - m_Alpha) * m_EnergyPrime + m_Alpha * instantEnergy;
// smooth energy estimate using single-pole low-pass filter
m_EnergyPrime = (1.0f - m_Alpha) * m_EnergyPrime + m_Alpha * instantEnergy;
// update gain according to output energy
if (m_EnergyPrime > 1e-6f)
m_Gain *= exp( -0.5f * m_Alpha * log(m_EnergyPrime) );
// update gain according to output energy
if (m_EnergyPrime > 1e-6f)
m_Gain *= exp( -0.5f * m_Alpha * log(m_EnergyPrime) );
// clamp gain
if (m_Gain > m_GainMax)
m_Gain = m_GainMax;
else if(m_Gain < m_GainMin)
m_Gain = m_GainMin;
// clamp gain
if (m_Gain > m_GainMax)
m_Gain = m_GainMax;
else if(m_Gain < m_GainMin)
m_Gain = m_GainMin;
return output;
//write processed sample back
voice[i] = HIBYTE((short)output);
voice[i+1] = LOBYTE((short)output);
}
}