volumeinxxx.cpp

很实用的程序. 用Virtual C++ 6.0做的,实现对声音的采集,处理,从而对MIC的声音进行控制的效果, 本程序是已成功测试通过.

// VolumeInXXX.cpp : Module interface implementation.
// Developer : Alex Chmut
// Created : 8/11/98
#include "StdAfx.h"
#include "VolumeInXXX.h"

/////////////////////////////////////////////////////////////////////////////
// 		Defines
#define	BAD_DWORD	(DWORD)-1
#define	WND_CLASS_NAME	"Input Volume Msg Wnd Class"
#define	WND_NAME		"Input Volume Msg Wnd"

/////////////////////////////////////////////////////////////////////////////
// 		Globals
PCVolumeInXXX g_pThis = NULL;

////////////////////////////////////////////////////////////

//{{{ Audio specific functions
#define AUDFREQ			22050	// Frequency
#define AUDCHANNELS		1		// Number of channels
#define AUDBITSMPL		16		// Number of bits per sample
inline
void SetDeviceType( WAVEFORMATEX* pwfe )
{
	memset( pwfe, 0, sizeof(WAVEFORMATEX) );
	WORD  nBlockAlign = (AUDCHANNELS*AUDBITSMPL)/8;
	DWORD nSamplesPerSec = AUDFREQ;
	pwfe->wFormatTag = WAVE_FORMAT_PCM;
	pwfe->nChannels = AUDCHANNELS;
	pwfe->nBlockAlign = nBlockAlign;
	pwfe->nSamplesPerSec = nSamplesPerSec;
	pwfe->wBitsPerSample = AUDBITSMPL;
	pwfe->nAvgBytesPerSec = nSamplesPerSec*nBlockAlign;
}
//}}} Audio specific functions

/////////////////////////////////////////////////////////////////////////////
// 		Implementation
//////////////
CVolumeInXXX::CVolumeInXXX( UINT uLineIndex )
	:	m_bOK(false),
		m_bInitialized(false),
		m_bAvailable(false),

		m_uMixerID(0L),
		m_dwMixerHandle(0L),
		m_hWnd(NULL),

		m_uMicrophoneSourceLineIndex(BAD_DWORD),

		m_dwMinimalVolume(BAD_DWORD),
		m_dwMaximalVolume(BAD_DWORD),

		m_pfUserSink(NULL),
		m_dwUserValue(0L)
{
	if ( m_bOK = Init() )
	{
		g_pThis = this;
		if ( !Initialize( uLineIndex ) )
		{
			Done();
			g_pThis = NULL;
		}
	}
}
//////////////
CVolumeInXXX::~CVolumeInXXX()
{
	if ( m_bOK )
		Done();
	g_pThis = NULL;
}
//////////////
bool CVolumeInXXX::Init()
{
	if ( !mixerGetNumDevs() )
		return false;
	// Getting Mixer ID
	HWAVEIN hwaveIn;
	MMRESULT mmResult;
	WAVEFORMATEX WaveFmt;
	SetDeviceType( &WaveFmt );
	mmResult = waveInOpen( &hwaveIn, WAVE_MAPPER, &WaveFmt, 0L, 0L, CALLBACK_NULL );
	if ( mmResult != MMSYSERR_NOERROR )
	{
		TRACE(".InputXxxVolume: FAILURE: Could not open WaveIn Mapper. mmResult=%d\n", mmResult );
		return false;
	} else {
		mmResult = mixerGetID( (HMIXEROBJ)hwaveIn, &m_uMixerID, MIXER_OBJECTF_HWAVEIN );
		waveInClose( hwaveIn );
		if ( mmResult != MMSYSERR_NOERROR )
		{
			TRACE(".InputXxxVolume: FAILURE: WaveIn Mapper in Mixer is not available. mmResult=%d\n", mmResult );
			return false;
		}
	}
	// Exposing Window to Mixer
	WNDCLASSEX wcx;
	memset( &wcx, 0, sizeof(WNDCLASSEX) );	
	wcx.cbSize = sizeof(WNDCLASSEX);
	wcx.lpszClassName = WND_CLASS_NAME;
	wcx.lpfnWndProc = (WNDPROC)MixerWndProc;
	::RegisterClassEx(&wcx);
	m_hWnd = CreateWindow(	WND_CLASS_NAME,
							WND_NAME,
							WS_POPUP | WS_DISABLED,
							0, 0, 0, 0,
							NULL, NULL, NULL, NULL );
	if ( !m_hWnd )
	{
		TRACE(".InputXxxVolume: FAILURE: Could not create internal window.\n" );
		return false;
	}
	::ShowWindow(m_hWnd, SW_HIDE);
	mmResult = mixerOpen( (LPHMIXER)&m_dwMixerHandle, m_uMixerID, (DWORD)m_hWnd, 0L, CALLBACK_WINDOW );
	if ( mmResult != MMSYSERR_NOERROR )
	{
		TRACE(".InputXxxVolume: FAILURE: Could not open Mixer. mmResult=%d\n", mmResult );
		::DestroyWindow( m_hWnd );
		return false;
	}
	return true;
}
//////////////
void CVolumeInXXX::Done()
{
	if ( mixerClose( (HMIXER)m_dwMixerHandle ) != MMSYSERR_NOERROR )
	{
		TRACE(".InputXxxVolume: WARNING: Could not close Mixer.\n" );
	}
	::DestroyWindow( m_hWnd );
	m_bInitialized = false;
	m_bOK = false;
}
//////////////
void CVolumeInXXX::OnControlChanged( DWORD dwControlID )
{
	if ( m_dwVolumeControlID == dwControlID )
	{
		DWORD dwVolume = GetCurrentVolume();
		if ( (dwVolume!=BAD_DWORD) && (m_pfUserSink) )
		{
			(*m_pfUserSink)( dwVolume, m_dwUserValue );
		}
	}
}
//////////////
bool CVolumeInXXX::Initialize( UINT uLineIndex )
{
	MMRESULT mmResult;
	if ( !m_bOK )
		return false;
	TRACE(".InputXxxVolume: Initializing for the Source Line (%d) ..\n", uLineIndex );
	MIXERLINE MixerLine;
	memset( &MixerLine, 0, sizeof(MIXERLINE) );
	MixerLine.cbStruct = sizeof(MIXERLINE);
	MixerLine.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_WAVEIN;
	mmResult = mixerGetLineInfo( (HMIXEROBJ)m_dwMixerHandle, &MixerLine, MIXER_GETLINEINFOF_COMPONENTTYPE );
	if ( mmResult != MMSYSERR_NOERROR )
	{
		TRACE(".InputXxxVolume: FAILURE: Could not get WaveIn Destionation Line for the requested source while initilaizing. mmResult=%d\n", mmResult );
		return false;
	}

	MIXERCONTROL Control;
	memset( &Control, 0, sizeof(MIXERCONTROL) );
	Control.cbStruct = sizeof(MIXERCONTROL);

	MIXERLINECONTROLS LineControls;
	memset( &LineControls, 0, sizeof(MIXERLINECONTROLS) );
	LineControls.cbStruct = sizeof(MIXERLINECONTROLS);

	MIXERLINE Line;
	memset( &Line, 0, sizeof(MIXERLINE) );
	Line.cbStruct = sizeof(MIXERLINE);

	if ( ( uLineIndex < MixerLine.cConnections ) )
	{
		Line.dwDestination = MixerLine.dwDestination;
		Line.dwSource = uLineIndex;
		mmResult = mixerGetLineInfo( (HMIXEROBJ)m_dwMixerHandle, &Line, MIXER_GETLINEINFOF_SOURCE );
		if ( mmResult != MMSYSERR_NOERROR )
		{
			TRACE(".InputXxxVolume: FAILURE: Could not get the requested Source Line while initilaizing. mmResult=%d\n", mmResult );
			return false;
		}
		TRACE(".InputXxxVolume: \"%s\" Source Line adopted.\n", Line.szShortName );
		LineControls.dwControlType = MIXERCONTROL_CONTROLTYPE_VOLUME;
		LineControls.dwLineID = Line.dwLineID;
		LineControls.cControls = 1;
		LineControls.cbmxctrl = sizeof(MIXERCONTROL);
		LineControls.pamxctrl = &Control;
		mmResult = mixerGetLineControls( (HMIXEROBJ)m_dwMixerHandle, &LineControls, MIXER_GETLINECONTROLSF_ONEBYTYPE );
		if ( mmResult == MMSYSERR_NOERROR )
		{
			if ( !(Control.fdwControl & MIXERCONTROL_CONTROLF_DISABLED) )
			{
				m_bAvailable = true;
				TRACE(".InputXxxVolume: \"%s\" Volume control for the Source Line adopted\n", Control.szShortName );
			} else {
				TRACE(".InputXxxVolume: WARNING: The Volume Control is disabled.\n" );
			}
		} else {
			TRACE(".InputXxxVolume: WARNING: Could not get the requested Source Line Volume Control for the requested line while initilaizing. mmResult=%d\n", mmResult );
		}		
	} else {
		TRACE(".InputXxxVolume: FAILURE: Invalid Source Line index passed.\n" );
		return false;
	}

	// Retrieving Microphone Source Line
	for ( UINT uLine = 0; uLine < MixerLine.cConnections; uLine++ )
	{
		MIXERLINE MicrophoneLine;
		memset( &MicrophoneLine, 0, sizeof(MIXERLINE) );
		MicrophoneLine.cbStruct = sizeof(MIXERLINE);
		MicrophoneLine.dwDestination = MixerLine.dwDestination;
		MicrophoneLine.dwSource = uLine;
		mmResult = mixerGetLineInfo( (HMIXEROBJ)m_dwMixerHandle, &MicrophoneLine, MIXER_GETLINEINFOF_SOURCE );
		if ( mmResult == MMSYSERR_NOERROR )
		{
			if ( MicrophoneLine.dwComponentType == MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE )
			{
				m_uMicrophoneSourceLineIndex = MicrophoneLine.dwSource;
				TRACE(".InputXxxVolume: Microphone Source Line \"%s\" has been found.\n", MicrophoneLine.szShortName );
				break;
			}
		}
	}
	if ( m_uMicrophoneSourceLineIndex == BAD_DWORD )
	{
		TRACE(".InputXxxVolume: WARNING: Could not retrieve Microphone Source Line.\n" );
	}

	m_uSourceLineIndex = uLineIndex;
	m_nChannelCount = Line.cChannels;
	m_dwLineID = LineControls.dwLineID;
	m_dwVolumeControlID = Control.dwControlID;
	m_dwMinimalVolume = Control.Bounds.dwMinimum;
	m_dwMaximalVolume = Control.Bounds.dwMaximum;
	m_dwVolumeStep = Control.Metrics.cSteps;

	m_bInitialized = true;
	return true;
}
//////////////////////////////////////////////
bool CVolumeInXXX::GetMicrophoneSourceLineIndex( UINT* puLineIndex )
{
	if ( !puLineIndex || !m_bInitialized || (m_uMicrophoneSourceLineIndex==BAD_DWORD) )
		return false;
	*puLineIndex = m_uMicrophoneSourceLineIndex;
	return true;
}
//////////////////////////////////////////////
// IVolume interface
//////////////
bool CVolumeInXXX::IsAvailable()
{
	return m_bAvailable;
}
//////////////
void CVolumeInXXX::Enable()
{
	if ( !m_bInitialized )
		return;
	bool bAnyEnabled = false;