soundlayer.cpp

<B>DirectX9.0 3D游戏编程</B>

/*******************************************************************
 *         Advanced 3D Game Programming using DirectX 9.0
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * copyright (c) 2003 by Peter A Walsh and Adrian Perez
 * See license.txt for modification and distribution information
 ******************************************************************/

#include "stdafx.h"

#include "SoundLayer.h"
#include "Sound.h"

#include "dxhelper.h"

cSoundLayer* cSoundLayer::m_pGlobalSLayer = NULL;

cSoundLayer::cSoundLayer( HWND hWnd )
{
	m_pDSound = NULL;
	m_pPrimary = NULL;

	if( m_pGlobalSLayer )
	{
		throw cGameError( "cSoundLayer already initialized!" );
	}
	m_pGlobalSLayer = this;

    HRESULT             hr;
    LPDIRECTSOUNDBUFFER pDSBPrimary = NULL;

    // Create IDirectSound using the primary sound device
	hr = DirectSoundCreate8( NULL, &m_pDSound, NULL );
    if( FAILED( hr ) )
	{
        throw cGameError( "DirectSoundCreate failed!" );
	}

    // Set coop level to DSSCL_PRIORITY
	hr = m_pDSound->SetCooperativeLevel( hWnd, DSSCL_PRIORITY );
    if( FAILED( hr ) )
	{
        throw cGameError( "SetCooperativeLevel (DS) failed!" );
	}

    // Get the primary buffer 
	sAutoZero<DSBUFFERDESC> dsbd;
    dsbd.dwFlags       = DSBCAPS_PRIMARYBUFFER;
    dsbd.dwBufferBytes = 0;
    dsbd.lpwfxFormat   = NULL;
       
	hr = m_pDSound->CreateSoundBuffer( &dsbd, &pDSBPrimary, NULL );
    if( FAILED( hr ) )
	{
        throw cGameError( "CreateSoundBuffer (DS) failed!" );
	}

    // Set primary buffer format to 22kHz and 16-bit output.
    WAVEFORMATEX wfx;
    ZeroMemory( &wfx, sizeof(WAVEFORMATEX) ); 
    wfx.wFormatTag      = WAVE_FORMAT_PCM; 
    wfx.nChannels       = 2; 
    wfx.nSamplesPerSec  = 22050; 
    wfx.wBitsPerSample  = 16; 
    wfx.nBlockAlign     = wfx.wBitsPerSample / 8 * wfx.nChannels;
    wfx.nAvgBytesPerSec = wfx.nSamplesPerSec * wfx.nBlockAlign;

    if( FAILED( hr = pDSBPrimary->SetFormat(&wfx) ) )
	{
       throw cGameError( "SetFormat (DS) failed!" );
	}

    SafeRelease( pDSBPrimary );
}

cSoundLayer::~cSoundLayer()
{
	SafeRelease( m_pPrimary );
	SafeRelease( m_pDSound );
	m_pGlobalSLayer = NULL;
}