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dsutil.h：源码内容
							//-----------------------------------------------------------------------------
// File: DSUtil.h
//
// Desc: 
//
// Copyright (c) 1999-2001 Microsoft Corp. All rights reserved.
//-----------------------------------------------------------------------------
#ifndef DSUTIL_H
#define DSUTIL_H
#include <windows.h>
#include <mmsystem.h>
#include <mmreg.h>
#include <dsound.h>
//-----------------------------------------------------------------------------
// Classes used by this header
//-----------------------------------------------------------------------------
class CSoundManager;
class CSound;
class CStreamingSound;
class CWaveFile;
//-----------------------------------------------------------------------------
// Typing macros 
//-----------------------------------------------------------------------------
#define WAVEFILE_READ   1
#define WAVEFILE_WRITE  2
#define DSUtil_StopSound(s)         { if(s) s->Stop(); }
#define DSUtil_PlaySound(s)         { if(s) s->Play( 0, 0 ); }
#define DSUtil_PlaySoundLooping(s)  { if(s) s->Play( 0, DSBPLAY_LOOPING ); }
//-----------------------------------------------------------------------------
// Name: class CSoundManager
// Desc: 
//-----------------------------------------------------------------------------
class CSoundManager
{
protected:
    LPDIRECTSOUND8 m_pDS;
public:
    CSoundManager();
    ~CSoundManager();
    HRESULT Initialize( HWND hWnd, DWORD dwCoopLevel, DWORD dwPrimaryChannels, DWORD dwPrimaryFreq, DWORD dwPrimaryBitRate );
    inline  LPDIRECTSOUND8 GetDirectSound() { return m_pDS; }
    HRESULT SetPrimaryBufferFormat( DWORD dwPrimaryChannels, DWORD dwPrimaryFreq, DWORD dwPrimaryBitRate );
    HRESULT Get3DListenerInterface( LPDIRECTSOUND3DLISTENER* ppDSListener );
    HRESULT Create( CSound** ppSound, LPTSTR strWaveFileName, DWORD dwCreationFlags = 0, GUID guid3DAlgorithm = GUID_NULL, DWORD dwNumBuffers = 1 );
    HRESULT CreateFromMemory( CSound** ppSound, BYTE* pbData, ULONG ulDataSize, LPWAVEFORMATEX pwfx, DWORD dwCreationFlags = 0, GUID guid3DAlgorithm = GUID_NULL, DWORD dwNumBuffers = 1 );
    HRESULT CreateStreaming( CStreamingSound** ppStreamingSound, LPTSTR strWaveFileName, DWORD dwCreationFlags, GUID guid3DAlgorithm, DWORD dwNotifyCount, DWORD dwNotifySize, HANDLE hNotifyEvent );
};
//-----------------------------------------------------------------------------
// Name: class CSound
// Desc: Encapsulates functionality of a DirectSound buffer.
//-----------------------------------------------------------------------------
class CSound
{
protected:
    LPDIRECTSOUNDBUFFER* m_apDSBuffer;
    DWORD                m_dwDSBufferSize;
    CWaveFile*           m_pWaveFile;
    DWORD                m_dwNumBuffers;
    HRESULT RestoreBuffer( LPDIRECTSOUNDBUFFER pDSB, BOOL* pbWasRestored );
public:
    CSound( LPDIRECTSOUNDBUFFER* apDSBuffer, DWORD dwDSBufferSize, DWORD dwNumBuffers, CWaveFile* pWaveFile );
    virtual ~CSound();
    HRESULT Get3DBufferInterface( DWORD dwIndex, LPDIRECTSOUND3DBUFFER* ppDS3DBuffer );
    HRESULT FillBufferWithSound( LPDIRECTSOUNDBUFFER pDSB, BOOL bRepeatWavIfBufferLarger );
    LPDIRECTSOUNDBUFFER GetFreeBuffer();
    LPDIRECTSOUNDBUFFER GetBuffer( DWORD dwIndex );
    HRESULT Play( DWORD dwPriority = 0, DWORD dwFlags = 0 );
    HRESULT Stop();
    HRESULT Reset();
    BOOL    IsSoundPlaying();
};
//-----------------------------------------------------------------------------
// Name: class CStreamingSound
// Desc: Encapsulates functionality to play a wave file with DirectSound.  
//       The Create() method loads a chunk of wave file into the buffer, 
//       and as sound plays more is written to the buffer by calling 
//       HandleWaveStreamNotification() whenever hNotifyEvent is signaled.
//-----------------------------------------------------------------------------
class CStreamingSound : public CSound
{
protected:
    DWORD m_dwLastPlayPos;
    DWORD m_dwPlayProgress;
    DWORD m_dwNotifySize;
    DWORD m_dwNextWriteOffset;
    BOOL  m_bFillNextNotificationWithSilence;
public:
    CStreamingSound( LPDIRECTSOUNDBUFFER pDSBuffer, DWORD dwDSBufferSize, CWaveFile* pWaveFile, DWORD dwNotifySize );
    ~CStreamingSound();
    HRESULT HandleWaveStreamNotification( BOOL bLoopedPlay );
    HRESULT Reset();
};
//-----------------------------------------------------------------------------
// Name: class CWaveFile
// Desc: Encapsulates reading or writing sound data to or from a wave file
//-----------------------------------------------------------------------------
class CWaveFile
{
public:
    WAVEFORMATEX* m_pwfx;        // Pointer to WAVEFORMATEX structure
    HMMIO         m_hmmio;       // MM I/O handle for the WAVE
    MMCKINFO      m_ck;          // Multimedia RIFF chunk
    MMCKINFO      m_ckRiff;      // Use in opening a WAVE file
    DWORD         m_dwSize;      // The size of the wave file
    MMIOINFO      m_mmioinfoOut;
    DWORD         m_dwFlags;
    BOOL          m_bIsReadingFromMemory;
    BYTE*         m_pbData;
    BYTE*         m_pbDataCur;
    ULONG         m_ulDataSize;
    CHAR*         m_pResourceBuffer;
protected:
    HRESULT ReadMMIO();
    HRESULT WriteMMIO( WAVEFORMATEX *pwfxDest );
public:
    CWaveFile();
    ~CWaveFile();
    HRESULT Open( LPTSTR strFileName, WAVEFORMATEX* pwfx, DWORD dwFlags );
    HRESULT OpenFromMemory( BYTE* pbData, ULONG ulDataSize, WAVEFORMATEX* pwfx, DWORD dwFlags );
    HRESULT Close();
    HRESULT Read( BYTE* pBuffer, DWORD dwSizeToRead, DWORD* pdwSizeRead );
    HRESULT Write( UINT nSizeToWrite, BYTE* pbData, UINT* pnSizeWrote );
    DWORD   GetSize();
    HRESULT ResetFile();
    WAVEFORMATEX* GetFormat() { return m_pwfx; };
};
#endif // DSUTIL_H

						