dxutsound.cpp

DX例子中等难度的。全是新例子。VC2003

    DSBPOSITIONNOTIFY*  aPosNotify     = NULL;
    LPDIRECTSOUNDNOTIFY pDSNotify      = NULL;

    pWaveFile = new CWaveFile();
    if( pWaveFile == NULL )
        return E_OUTOFMEMORY;
    pWaveFile->Open( strWaveFileName, NULL, WAVEFILE_READ );

    // Figure out how big the DirectSound buffer should be
    dwDSBufferSize = dwNotifySize * dwNotifyCount;

    // Set up the direct sound buffer.  Request the NOTIFY flag, so
    // that we are notified as the sound buffer plays.  Note, that using this flag
    // may limit the amount of hardware acceleration that can occur.
    DSBUFFERDESC dsbd;
    ZeroMemory( &dsbd, sizeof(DSBUFFERDESC) );
    dsbd.dwSize          = sizeof(DSBUFFERDESC);
    dsbd.dwFlags         = dwCreationFlags |
                           DSBCAPS_CTRLPOSITIONNOTIFY |
                           DSBCAPS_GETCURRENTPOSITION2;
    dsbd.dwBufferBytes   = dwDSBufferSize;
    dsbd.guid3DAlgorithm = guid3DAlgorithm;
    dsbd.lpwfxFormat     = pWaveFile->m_pwfx;

    if( FAILED( hr = m_pDS->CreateSoundBuffer( &dsbd, &pDSBuffer, NULL ) ) )
    {
        // If wave format isn't then it will return
        // either DSERR_BADFORMAT or E_INVALIDARG
        if( hr == DSERR_BADFORMAT || hr == E_INVALIDARG )
            return DXUT_ERR( L"CreateSoundBuffer", hr );

        return DXUT_ERR( L"CreateSoundBuffer", hr );
    }

    // Create the notification events, so that we know when to fill
    // the buffer as the sound plays.
    if( FAILED( hr = pDSBuffer->QueryInterface( IID_IDirectSoundNotify,
                                                (VOID**)&pDSNotify ) ) )
    {
        SAFE_DELETE_ARRAY( aPosNotify );
        return DXUT_ERR( L"QueryInterface", hr );
    }

    aPosNotify = new DSBPOSITIONNOTIFY[ dwNotifyCount ];
    if( aPosNotify == NULL )
        return E_OUTOFMEMORY;

    for( DWORD i = 0; i < dwNotifyCount; i++ )
    {
        aPosNotify[i].dwOffset     = (dwNotifySize * i) + dwNotifySize - 1;
        aPosNotify[i].hEventNotify = hNotifyEvent;
    }

    // Tell DirectSound when to notify us. The notification will come in the from
    // of signaled events that are handled in WinMain()
    if( FAILED( hr = pDSNotify->SetNotificationPositions( dwNotifyCount,
                                                          aPosNotify ) ) )
    {
        SAFE_RELEASE( pDSNotify );
        SAFE_DELETE_ARRAY( aPosNotify );
        return DXUT_ERR( L"SetNotificationPositions", hr );
    }

    SAFE_RELEASE( pDSNotify );
    SAFE_DELETE_ARRAY( aPosNotify );

    // Create the sound
    *ppStreamingSound = new CStreamingSound( pDSBuffer, dwDSBufferSize, pWaveFile, dwNotifySize );

    return S_OK;
}


//-----------------------------------------------------------------------------
// Name: CSound::CSound()
// Desc: Constructs the class
//-----------------------------------------------------------------------------
CSound::CSound( LPDIRECTSOUNDBUFFER* apDSBuffer, DWORD dwDSBufferSize,
                DWORD dwNumBuffers, CWaveFile* pWaveFile, DWORD dwCreationFlags )
{
    DWORD i;

    if( dwNumBuffers <= 0 )
        return;

    m_apDSBuffer = new LPDIRECTSOUNDBUFFER[dwNumBuffers];
    if( NULL != m_apDSBuffer )
    {
        for( i=0; i<dwNumBuffers; i++ )
            m_apDSBuffer[i] = apDSBuffer[i];

        m_dwDSBufferSize = dwDSBufferSize;
        m_dwNumBuffers   = dwNumBuffers;
        m_pWaveFile      = pWaveFile;
        m_dwCreationFlags = dwCreationFlags;

        FillBufferWithSound( m_apDSBuffer[0], FALSE );
    }
}


//-----------------------------------------------------------------------------
// Name: CSound::~CSound()
// Desc: Destroys the class
//-----------------------------------------------------------------------------
CSound::~CSound()
{
    for( DWORD i=0; i<m_dwNumBuffers; i++ )
    {
        SAFE_RELEASE( m_apDSBuffer[i] );
    }

    SAFE_DELETE_ARRAY( m_apDSBuffer );
    SAFE_DELETE( m_pWaveFile );
}


//-----------------------------------------------------------------------------
// Name: CSound::FillBufferWithSound()
// Desc: Fills a DirectSound buffer with a sound file
//-----------------------------------------------------------------------------
HRESULT CSound::FillBufferWithSound( LPDIRECTSOUNDBUFFER pDSB, BOOL bRepeatWavIfBufferLarger )
{
    HRESULT hr;
    VOID*   pDSLockedBuffer      = NULL; // Pointer to locked buffer memory
    DWORD   dwDSLockedBufferSize = 0;    // Size of the locked DirectSound buffer
    DWORD   dwWavDataRead        = 0;    // Amount of data read from the wav file

    if( pDSB == NULL )
        return CO_E_NOTINITIALIZED;

    // Make sure we have focus, and we didn't just switch in from
    // an app which had a DirectSound device
    if( FAILED( hr = RestoreBuffer( pDSB, NULL ) ) )
        return DXUT_ERR( L"RestoreBuffer", hr );

    // Lock the buffer down
    if( FAILED( hr = pDSB->Lock( 0, m_dwDSBufferSize,
                                 &pDSLockedBuffer, &dwDSLockedBufferSize,
                                 NULL, NULL, 0L ) ) )
        return DXUT_ERR( L"Lock", hr );

    // Reset the wave file to the beginning
    m_pWaveFile->ResetFile();

    if( FAILED( hr = m_pWaveFile->Read( (BYTE*) pDSLockedBuffer,
                                        dwDSLockedBufferSize,
                                        &dwWavDataRead ) ) )
        return DXUT_ERR( L"Read", hr );

    if( dwWavDataRead == 0 )
    {
        // Wav is blank, so just fill with silence
        FillMemory( (BYTE*) pDSLockedBuffer,
                    dwDSLockedBufferSize,
                    (BYTE)(m_pWaveFile->m_pwfx->wBitsPerSample == 8 ? 128 : 0 ) );
    }
    else if( dwWavDataRead < dwDSLockedBufferSize )
    {
        // If the wav file was smaller than the DirectSound buffer,
        // we need to fill the remainder of the buffer with data
        if( bRepeatWavIfBufferLarger )
        {
            // Reset the file and fill the buffer with wav data
            DWORD dwReadSoFar = dwWavDataRead;    // From previous call above.
            while( dwReadSoFar < dwDSLockedBufferSize )
            {
                // This will keep reading in until the buffer is full
                // for very short files
                if( FAILED( hr = m_pWaveFile->ResetFile() ) )
                    return DXUT_ERR( L"ResetFile", hr );

                hr = m_pWaveFile->Read( (BYTE*)pDSLockedBuffer + dwReadSoFar,
                                        dwDSLockedBufferSize - dwReadSoFar,
                                        &dwWavDataRead );
                if( FAILED(hr) )
                    return DXUT_ERR( L"Read", hr );

                dwReadSoFar += dwWavDataRead;
            }
        }
        else
        {
            // Don't repeat the wav file, just fill in silence
            FillMemory( (BYTE*) pDSLockedBuffer + dwWavDataRead,
                        dwDSLockedBufferSize - dwWavDataRead,
                        (BYTE)(m_pWaveFile->m_pwfx->wBitsPerSample == 8 ? 128 : 0 ) );
        }
    }

    // Unlock the buffer, we don't need it anymore.
    pDSB->Unlock( pDSLockedBuffer, dwDSLockedBufferSize, NULL, 0 );

    return S_OK;
}


//-----------------------------------------------------------------------------
// Name: CSound::RestoreBuffer()
// Desc: Restores the lost buffer. *pbWasRestored returns TRUE if the buffer was
//       restored.  It can also NULL if the information is not needed.
//-----------------------------------------------------------------------------
HRESULT CSound::RestoreBuffer( LPDIRECTSOUNDBUFFER pDSB, BOOL* pbWasRestored )
{
    HRESULT hr;

    if( pDSB == NULL )
        return CO_E_NOTINITIALIZED;
    if( pbWasRestored )
        *pbWasRestored = FALSE;

    DWORD dwStatus;
    if( FAILED( hr = pDSB->GetStatus( &dwStatus ) ) )
        return DXUT_ERR( L"GetStatus", hr );

    if( dwStatus & DSBSTATUS_BUFFERLOST )
    {
        // Since the app could have just been activated, then
        // DirectSound may not be giving us control yet, so
        // the restoring the buffer may fail.
        // If it does, sleep until DirectSound gives us control.
        do
        {
            hr = pDSB->Restore();
            if( hr == DSERR_BUFFERLOST )
                Sleep( 10 );
        }
        while( ( hr = pDSB->Restore() ) == DSERR_BUFFERLOST );

        if( pbWasRestored != NULL )
            *pbWasRestored = TRUE;

        return S_OK;
    }
    else
    {
        return S_FALSE;
    }
}


//-----------------------------------------------------------------------------
// Name: CSound::GetFreeBuffer()
// Desc: Finding the first buffer that is not playing and return a pointer to
//       it, or if all are playing return a pointer to a randomly selected buffer.
//-----------------------------------------------------------------------------
LPDIRECTSOUNDBUFFER CSound::GetFreeBuffer()
{
    if( m_apDSBuffer == NULL )
        return FALSE;

    DWORD i;
    for( i=0; i<m_dwNumBuffers; i++ )
    {
        if( m_apDSBuffer[i] )
        {
            DWORD dwStatus = 0;
            m_apDSBuffer[i]->GetStatus( &dwStatus );
            if ( ( dwStatus & DSBSTATUS_PLAYING ) == 0 )
                break;
        }
    }

    if( i != m_dwNumBuffers )
        return m_apDSBuffer[ i ];
    else
        return m_apDSBuffer[ rand() % m_dwNumBuffers ];
}


//-----------------------------------------------------------------------------
// Name: CSound::GetBuffer()
// Desc:
//-----------------------------------------------------------------------------
LPDIRECTSOUNDBUFFER CSound::GetBuffer( DWORD dwIndex )
{
    if( m_apDSBuffer == NULL )
        return NULL;
    if( dwIndex >= m_dwNumBuffers )
        return NULL;

    return m_apDSBuffer[dwIndex];
}


//-----------------------------------------------------------------------------
// Name: CSound::Get3DBufferInterface()
// Desc:
//-----------------------------------------------------------------------------
HRESULT CSound::Get3DBufferInterface( DWORD dwIndex, LPDIRECTSOUND3DBUFFER* ppDS3DBuffer )
{
    if( m_apDSBuffer == NULL )
        return CO_E_NOTINITIALIZED;
    if( dwIndex >= m_dwNumBuffers )
        return E_INVALIDARG;

    *ppDS3DBuffer = NULL;

    return m_apDSBuffer[dwIndex]->QueryInterface( IID_IDirectSound3DBuffer,
                                                  (VOID**)ppDS3DBuffer );
}


//-----------------------------------------------------------------------------
// Name: CSound::Play()
// Desc: Plays the sound using voice management flags.  Pass in DSBPLAY_LOOPING
//       in the dwFlags to loop the sound
//-----------------------------------------------------------------------------
HRESULT CSound::Play( DWORD dwPriority, DWORD dwFlags, LONG lVolume, LONG lFrequency, LONG lPan )
{
    HRESULT hr;
    BOOL    bRestored;

    if( m_apDSBuffer == NULL )
        return CO_E_NOTINITIALIZED;

    LPDIRECTSOUNDBUFFER pDSB = GetFreeBuffer();

    if( pDSB == NULL )
        return DXUT_ERR( L"GetFreeBuffer", E_FAIL );

    // Restore the buffer if it was lost
    if( FAILED( hr = RestoreBuffer( pDSB, &bRestored ) ) )
        return DXUT_ERR( L"RestoreBuffer", hr );

    if( bRestored )
    {
        // The buffer was restored, so we need to fill it with new data
        if( FAILED( hr = FillBufferWithSound( pDSB, FALSE ) ) )
            return DXUT_ERR( L"FillBufferWithSound", hr );
    }

    if( m_dwCreationFlags & DSBCAPS_CTRLVOLUME )
    {
        pDSB->SetVolume( lVolume );
    }

    if( lFrequency != -1 &&
        (m_dwCreationFlags & DSBCAPS_CTRLFREQUENCY) )
    {
        pDSB->SetFrequency( lFrequency );
    }

    if( m_dwCreationFlags & DSBCAPS_CTRLPAN )
    {
        pDSB->SetPan( lPan );
    }

    return pDSB->Play( 0, dwPriority, dwFlags );
}


//-----------------------------------------------------------------------------
// Name: CSound::Play3D()
// Desc: Plays the sound using voice management flags.  Pass in DSBPLAY_LOOPING
//       in the dwFlags to loop the sound
//-----------------------------------------------------------------------------
HRESULT CSound::Play3D( LPDS3DBUFFER p3DBuffer, DWORD dwPriority, DWORD dwFlags, LONG lFrequency )
{
    HRESULT hr;
    BOOL    bRestored;
    DWORD   dwBaseFrequency;

    if( m_apDSBuffer == NULL )
        return CO_E_NOTINITIALIZED;

    LPDIRECTSOUNDBUFFER pDSB = GetFreeBuffer();
    if( pDSB == NULL )
        return DXUT_ERR( L"GetFreeBuffer", E_FAIL );

    // Restore the buffer if it was lost
    if( FAILED( hr = RestoreBuffer( pDSB, &bRestored ) ) )
        return DXUT_ERR( L"RestoreBuffer", hr );

    if( bRestored )
    {
        // The buffer was restored, so we need to fill it with new data
        if( FAILED( hr = FillBufferWithSound( pDSB, FALSE ) ) )
            return DXUT_ERR( L"FillBufferWithSound", hr );
    }

    if( m_dwCreationFlags & DSBCAPS_CTRLFREQUENCY )
    {
        pDSB->GetFrequency( &dwBaseFrequency );
        pDSB->SetFrequency( dwBaseFrequency + lFrequency );
    }

    // QI for the 3D buffer
    LPDIRECTSOUND3DBUFFER pDS3DBuffer;
    hr = pDSB->QueryInterface( IID_IDirectSound3DBuffer, (VOID**) &pDS3DBuffer );
    if( SUCCEEDED( hr ) )
    {
        hr = pDS3DBuffer->SetAllParameters( p3DBuffer, DS3D_IMMEDIATE );
        if( SUCCEEDED( hr ) )
        {