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#pragma once
#define IS_2_POW_N(X) (((X)&(X-1)) == 0)
enum class aligned_size_t : size_t {};
void * AllocateAligned(size_t cb, aligned_size_t AlignmentMask)
{
ASSERT(0 != cb);
//ASSERT(IS_2_POW_N(AlignmentMask + 1));
void *res = _aligned_malloc(cb, static_cast<size_t>(AlignmentMask) + 1);
return res;
}
void DeallocateAligned(void * p, aligned_size_t /* AlignmentMask */)
{
if (NULL != p)
{
_aligned_free(p);
}
}
UINT32 CalculateAlignmentMask(APO_CONNECTION_DESCRIPTOR * /* pDescriptor */, UINT32 u32BytesPerFrame)
{
const UINT32 u32AudioAlignment = sizeof(PVOID);
UINT32 u32Alignment = u32AudioAlignment - 1;
// Calculate the new alignment requirement for this buffer.
if (u32BytesPerFrame > u32AudioAlignment)
{
// Use the frame size directly if it is a power of two.
if (IS_2_POW_N(u32BytesPerFrame))
{
u32Alignment = u32BytesPerFrame - 1;
}
// The new alignment size should be greater than frame
// size and should be a power of 2.
else
{
u32Alignment = u32AudioAlignment;
while (u32BytesPerFrame / u32Alignment)
{
u32Alignment *= 2;
}
u32Alignment = u32Alignment - 1;
}
}
// Use default alignment if the frame size is less than the default
// alignment.
return u32Alignment;
} // CalculateAlignmentMask
HRESULT
CreateConnection(APO_CONNECTION_DESCRIPTOR* pDescriptor, APO_CONNECTION_PROPERTY* pProperty)
{
RETURN_HR_IF_NULL(E_POINTER, pDescriptor);
RETURN_HR_IF_NULL(E_POINTER, pDescriptor->pFormat);
RETURN_HR_IF_NULL(E_POINTER, pProperty);
UINT32 u32BytesPerFrame;
unsigned byteAlignmentMask;
BYTE* pAllocatedBuffer;
UNCOMPRESSEDAUDIOFORMAT Format;
RETURN_IF_FAILED(pDescriptor->pFormat->GetUncompressedAudioFormat(&Format));
u32BytesPerFrame =
Format.dwSamplesPerFrame * Format.dwBytesPerSampleContainer;
// Allocate buffer internally.
if (NULL == pDescriptor->pBuffer)
{
byteAlignmentMask = CalculateAlignmentMask(pDescriptor, u32BytesPerFrame);
pAllocatedBuffer = (BYTE *)AllocateAligned(pDescriptor->u32MaxFrameCount * u32BytesPerFrame, static_cast<aligned_size_t>(byteAlignmentMask));
RETURN_HR_IF_NULL(E_OUTOFMEMORY, pAllocatedBuffer);
pDescriptor->pBuffer = reinterpret_cast<UINT_PTR>(pAllocatedBuffer);
pDescriptor->Type = APO_CONNECTION_BUFFER_TYPE_ALLOCATED;
}
// Use the given buffer.
else
{
pDescriptor->Type = APO_CONNECTION_BUFFER_TYPE_EXTERNAL;
}
pProperty->pBuffer = pDescriptor->pBuffer;
pProperty->u32ValidFrameCount = 0;
pProperty->u32Signature = APO_CONNECTION_PROPERTY_SIGNATURE;
return S_OK;
} // CreateConnection
HRESULT
DestroyConnection(APO_CONNECTION_DESCRIPTOR *pDescriptor)
{
HRESULT hResult;
UINT32 u32BytesPerFrame;
size_t byteAlignmentMask;
BYTE* pAllocatedBuffer;
UNCOMPRESSEDAUDIOFORMAT Format;
hResult = pDescriptor->pFormat->GetUncompressedAudioFormat(&Format);
//IF_FAILED_JUMP(hResult, Exit);
if (APO_CONNECTION_BUFFER_TYPE_ALLOCATED == pDescriptor->Type)
{
u32BytesPerFrame =
Format.dwSamplesPerFrame * Format.dwBytesPerSampleContainer;
byteAlignmentMask = CalculateAlignmentMask(pDescriptor, u32BytesPerFrame);
if (pDescriptor->pBuffer)
{
pAllocatedBuffer = reinterpret_cast<BYTE*>(pDescriptor->pBuffer);
RETURN_HR_IF_NULL(E_OUTOFMEMORY, pAllocatedBuffer);
DeallocateAligned((void *) pAllocatedBuffer, static_cast<aligned_size_t>(byteAlignmentMask));
}
}
pDescriptor->pFormat->Release();
pDescriptor->pFormat = NULL;
return hResult;
} // DestroyConnection
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