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Reduce processing delay

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Process one packet all at once
This commit is contained in:
Geoffrey Merck 2020-02-22 06:10:55 +01:00
parent 5356f37fd8
commit 02a583f0b3
14 changed files with 298 additions and 116 deletions
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47
ambed/cagc.cpp
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@ -25,10 +25,9 @@
// Only took the parts we need qnd recoeded it to be close the XLX coding style
// https://github.com/jgaeddert/liquid-dsp/blob/master/src/agc/src/agc.c
#include "main.h"
#include <math.h>
#include "cagc.h"
#include "main.h"
////////////////////////////////////////////////////////////////////////////////////////
// constructor
@ -63,35 +62,27 @@ float CAGC::GetGain()
////////////////////////////////////////////////////////////////////////////////////////
// process
void CAGC::Apply(uint8 * voice, int size)
inline float CAGC::ProcessSample(float input)
{
for (int i = 0; i < size; i+=2)
{
//Get the sample
float input = (float)(short)MAKEWORD(voice[i+1], voice[i]);
//apply AGC
// apply gain to input sample
float output = input * m_Gain;
//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;
//write processed sample back
voice[i] = HIBYTE((short)output);
voice[i+1] = LOBYTE((short)output);
}
}
return output;
}