70 lines
2.9 KiB
C
70 lines
2.9 KiB
C
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/*==========================================================================
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*
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* Copyright (C) 1999 Microsoft Corporation. All Rights Reserved.
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*
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* File: agcva.h
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* Content: Abstract base class for automatic gain control and
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* voice activation algorithms
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*
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* History:
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* Date By Reason
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* ==== == ======
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* 11/30/99 pnewson Created it
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* 01/31/2000 pnewson re-add support for absence of DVCLIENTCONFIG_AUTOSENSITIVITY flag
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* 03/03/2000 rodtoll Updated to handle alternative gamevoice build.
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* 04/25/2000 pnewson Fix to improve responsiveness of AGC when volume level too low
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*
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***************************************************************************/
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#ifndef _AGCVA_H_
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#define _AGCVA_H_
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// The purpose of this abstract base class is to make it relatively simple to
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// experiment with different AGC (auto gain control) & VA (voice activation)
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// algorithms during development. If used properly, switching algorithms at compile
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// time should be as simple as changing one line of code - the line where the concrete
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// AGC/VA class is created.
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//
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// Note that this interface is used to perform the AGC and VA calculations, and to save
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// and restore algorithm specific settings from the registry. It does not actually
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// adjust the volume on the device. That's the responsibility of the code using
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// this class
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//
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// The AGC and VA algorithms have been bundled into this single interface because
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// they often need to perform very similar calculations on the input frame. By combining
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// them into one interface, it is possible for them to share the results of frame
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// calculations.
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//
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// Additionally, the AGC algorithm is pretty much "at the mercy" of the VA algorithm,
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// since it presumably will not adjust the volume during periods of silence.
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//
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// If you want to experiment with families of AGC and VA algorithms that are meant
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// to work together, I suggest creating your own abstract AGC and VA base classes
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// for your family of algoriths, and write a concrete class derived from this one
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// that uses your separate abstract AGC and VA algorithms. That way someone won't come
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// along and try to plug an AGC or VA algorithm into your framework that does not belong.
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//
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class CAGCVA
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{
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public:
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CAGCVA() {};
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virtual ~CAGCVA() {};
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virtual HRESULT Init(
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const WCHAR *wszBasePath,
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DWORD dwFlags,
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GUID guidCaptureDevice,
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int iSampleRate,
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int iBitsPerSample,
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LONG* plInitVolume,
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DWORD dwSensitivity) = 0;
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virtual HRESULT Deinit() = 0;
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virtual HRESULT SetSensitivity(DWORD dwFlags, DWORD dwSensitivity) = 0;
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virtual HRESULT GetSensitivity(DWORD* pdwFlags, DWORD* pdwSensitivity) = 0;
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virtual HRESULT AnalyzeData(BYTE* pbAudioData, DWORD dwAudioDataSize) = 0;
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virtual HRESULT AGCResults(LONG lCurVolume, LONG* plNewVolume, BOOL fTransmitFrame) = 0;
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virtual HRESULT VAResults(BOOL* pfVoiceDetected) = 0;
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virtual HRESULT PeakResults(BYTE* pbPeakValue) = 0;
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};
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#endif
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