Game Audio - Game Coding Complete - page 425

HRESULT DirectSoundAudioBuffer::FillBufferWithSound( void )
{

HRESULT hr;
VOID *pDSLockedBuffer = NULL; // DirectSound buffer pointer

DWORD dwDSLockedBufferSize = 0; // Size of DirectSound buffer

DWORD dwWavDataRead = 0; // Data to read from the wav file

if( m_Sample )
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( NULL ) ) )
return DXUT_ERR( L

'

” RestoreBuffer ” ,hr);

int pcmBufferSize = m_Resource->Size();
shared_ptr<SoundResourceExtraData> extra =
static_pointer_cast<SoundResourceExtraData>(m_Resource->GetExtra());

// Lock the buffer down
if( FAILED( hr = m_Sample->Lock( 0, pcmBufferSize,
&pDSLockedBuffer, &dwDSLockedBufferSize,
NULL, NULL, 0L ) ) )
return DXUT_ERR( L”Lock”,hr);

if( pcmBufferSize == 0 )
{

// Wav is blank, so just fill with silence
FillMemory( (BYTE*) pDSLockedBuffer,
dwDSLockedBufferSize,
(BYTE)(m_Resource->GetFormat()->wBitsPerSample == 8 ? 128 :0));

}
else
{

CopyMemory(pDSLockedBuffer,
m_Resource->GetPCMBuffer(), pcmBufferSize);
if( pcmBufferSize < (int)dwDSLockedBufferSize )
{

// If the buffer sizes are different fill in the rest with silence
FillMemory( (BYTE*) pDSLockedBuffer + pcmBufferSize,
dwDSLockedBufferSize - pcmBufferSize,
(BYTE)(m_Resource->GetFormat()->wBitsPerSample == 8 ? 128 :0));

}

}