IMFMediaBuffer Interface
Represents a block of memory that contains media data. Use this interface to access the data in the buffer.
Mitglieder
IMFMediaBufferSchnittstelle erbt von der IUnknown-Schnittstelle. IMFMediaBuffer umfasst auch die folgenden Typen von Mitgliedern:
- Methoden
Methoden
IMFMediaBufferSchnittstelle umfasst die folgenden Methoden.
| Methode | Beschreibung |
|---|---|
| GetCurrentLength | Retrieves the length of the valid data in the buffer. |
| GetMaxLength | Retrieves the allocated size of the buffer. |
| Lock | Gives the caller access to the memory in the buffer. |
| SetCurrentLength | Sets the length of the valid data in the buffer. |
| Unlock | Unlocks a buffer that was previously locked. |
Hinweise
If the buffer contains 2-D image data (such as an uncompressed video frame), you should query the buffer for the IMF2DBuffer interface. The methods on IMF2DBuffer are optimized for 2-D data.
To get a buffer from a media sample, call one of the following IMFSample methods:
To create a new buffer object, use one of the following functions.
| Function | Description |
|---|---|
| MFCreateMemoryBuffer | Creates a buffer and allocates system memory. |
| MFCreateMediaBufferWrapper | Creates a media buffer that wraps an existing media buffer. |
| MFCreateDXSurfaceBuffer | Creates a buffer that manages a DirectX surface. |
| MFCreateAlignedMemoryBuffer | Creates a buffer and allocates system memory with a specified alignment. |
This interface is available on the following platforms if the Windows Media Format 11 SDK redistributable components are installed:
- Windows XP mit Service Pack 2 (SP2) und höher.
- Windows XP Media Center Edition 2005 with KB900325 (Windows XP Media Center Edition 2005) and KB925766 (Oktober 2006 Updaterollup für Windows XP Media Center Edition) installed.
Anforderungen
Mindestens unterstützter Client |
Windows Vista |
Mindestens unterstützter Server |
Windows Server 2008 |
Header |
Mfobjects.h (include Mfidl.h) |
Bibliothek |
Mfuuid.lib |