| Microsoft DirectX 9.0 |
The DMUS_BUFFERDESC structure is used to describe a buffer for the IDirectMusic8::CreateMusicBuffer method.
Syntax
typedef struct _DMUS_BUFFERDESC {
DWORD dwSize;
DWORD dwFlags;
GUID guidBufferFormat;
DWORD cbBuffer;
} DMUS_BUFFERDESC, *LPDMUS_BUFFERDESC;
Members
dwSize
Size of this structure, in bytes. This member must be initialized to sizeof(DMUS_BUFFERDESC) before the structure is used.
dwFlags
No flags are defined.
guidBufferFormat
Identifier of the KS format of the buffer. The value GUID_NULL represents KSDATAFORMAT_SUBTYPE_DIRECTMUSIC.
If guidBufferFormat represents a KS format other than KSDATAFORMAT_SUBTYPE_DIRECTMUSIC, the application must verify that the port playing back the data understands the specified format; if not, the buffer is ignored. To find out whether the port supports a specific KS format, use the IKsControl::KsProperty method.
cbBuffer
Minimum size of the buffer, in bytes. The amount of memory allocated can be slightly higher because the system pads the buffer to a multiple of 4 bytes. The buffer must be at least 32 bytes to accommodate a single MIDI channel message, and at least 28 bytes plus the size of the data to accommodate a system exclusive message or other unstructured data.
Requirements
Header: Declared in dmusici.h.
See Also