DXVA2_DecodeBufferDesc structure
Describes a buffer sent from a decoder to a DirectX Video Acceleration (DXVA) device.
Syntax
typedef struct _DXVA2_DecodeBufferDesc { DWORD CompressedBufferType; UINT BufferIndex; UINT DataOffset; UINT DataSize; UINT FirstMBaddress; UINT NumMBsInBuffer; UINT Width; UINT Height; UINT Stride; UINT ReservedBits; PVOID pvPVPState; } DXVA2_DecodeBufferDesc;
Members
- CompressedBufferType
-
Identifies the type of buffer passed to the accelerator. Must be one of the following values.
- BufferIndex
-
Reserved. Set to zero.
- DataOffset
-
Specifies the offset of the relevant data from the beginning of the buffer, in bytes. Currently this value must be zero.
- DataSize
-
Specifies the amount of relevant data in the buffer, in bytes. The location of the last byte of content in the buffer is DataOffset + DataSize − 1.
- FirstMBaddress
-
Specifies the macroblock address of the first macroblock in the buffer. The macroblock address is given in raster scan order.
- NumMBsInBuffer
-
Specifies the number of macroblocks of data in the buffer. This count includes skipped macroblocks. This value must be zero if the data buffer type is one of the following: picture decoding parameters, inverse-quantization matrix, AYUV, IA44/AI44, DPXD, Highlight, or DCCMD.
- Width
-
Reserved. Set to zero.
- Height
-
Reserved. Set to zero.
- Stride
-
Reserved. Set to zero.
- ReservedBits
-
Reserved. Set to zero.
- pvPVPState
-
Pointer to a byte array that contains an initialization vector (IV) for encrypted data. If the decode buffer does not contain encrypted data, set this member to NULL. If the decode buffer contains encrypted data, the contents of pvPVPState depends on the type of encryption. For D3DCRYPTOTYPE_AES128_CTR, the pvPVPState member points to a DXVA2_AES_CTR_IV structure.
Remarks
This structure corresponds closely to the DXVA_BufferDescription structure in DXVA 1, but some of the fields are no longer used in DXVA 2.
Requirements
|
Minimum supported client |
Windows Vista [desktop apps only] |
|---|---|
|
Minimum supported server |
Windows Server 2008 [desktop apps only] |
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Header |
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See also