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49 lines
1.2 KiB
49 lines
1.2 KiB
#ifndef _AGC_H
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#define _AGC_H
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#include "mixer.h"
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#define PEAKARRAYSIZE 5
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#define AGC_INCREMENT 10000 // approx 1/6 of the mixer range
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#define AGC_MAXVOL 65535 // highest mixer volume setting
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#define AGC_HIGHVOL 24576 // minimum for loud volume see Update() method
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#define AGC_PEAKVOL 32767 // peak sample value (could also be 32768)
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#define AGC_DEFAULT_THRESH 16384
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#define AGC_NOUPDATE 0
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#define AGC_UPDATE_LOWERVOL 1
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#define AGC_UPDATE_RAISEVOL 2
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class AGC
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{
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private:
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CMixerDevice *m_pMixer;
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WORD m_aPeaks[PEAKARRAYSIZE];
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int m_cPeaks; // how many have been inserted into above array
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WORD m_wCurrentPeak; // max value of last second
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DWORD m_dwCollectionTime; // amount of sampling collected so far
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WORD m_wThreshStrength; // the minimum we are trying to target
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DWORD m_dwLastVolumeSetting; // last known volume setting
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int m_nLastUpdateResult;
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inline BOOL RaiseVolume();
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inline BOOL LowerVolume();
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inline BOOL HasVolumeChanged();
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public:
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AGC(CMixerDevice *pMixer);
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void SetMixer(CMixerDevice *pMixer);
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inline void SetThresholdStrength(WORD wStrength) {m_wThreshStrength=wStrength;}
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int Update(WORD wPeakStrength, DWORD dwLengthMS);
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void Reset();
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};
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#endif
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