The IConfigInterleaving interface controls how files are written out to disk and sets interleaving configuration information such as frequency and preroll parameters.
This interface uses the InterleavingMode enumerated data type, which specifies how audio samples and video frames will be saved on a disk. Capture interleaving settings can range from INTERLEAVE_NONE to INTERLEAVE_FULL, depending on whether you will author immediately or later.
DirectShow currently implements this interface on the AVI multiplexer filter; however, you can implement it to set interleaving preferences on other file formats.
When to Implement
DirectShow implements this interface and makes its functionality available to anyone through the property page of an AVI multiplexer filter. However, you can implement this interface yourself when you want to be able to write out other file formats.
When to Use
Video-authoring applications that handle capturing should use this interface when they need to control how audio samples and video frames will be saved on a disk. Applications also use this interface when they need to set interleaving configuration information such as frequency and preroll parameters. (see Amcap.exe for a sample implementation of this interface).
Methods in Vtable Order
| IUnknown methods | Description |
| QueryInterface | Retrieves pointers to supported interfaces. |
| AddRef | Increments the reference count. |
| Release | Decrements the reference count. |
| IConfigInterleaving methods | Description |
| put_Mode | Sets how audio samples and video frames will be saved on disk by specifying quality of interleaving. |
| get_Mode | Retrieves the interleaving quality setting. |
| put_Interleaving | Sets the audio preroll time and the frequency of the interleaving. |
| get_Interleaving | Retrieves the audio preroll time and the frequency of the interleaving. |
Retrieves the audio preroll time and the frequency of the interleaving.
HRESULT get_ Interleaving(
REFERENCE_TIME *prtInterleave,
REFERENCE_TIME *prtPreroll );
Returns an HRESULT value that depends on the implementation of the interface.
IConfigInterleaving::put_Interleaving
Retrieves the interleaving quality setting.
HRESULT get_ Mode(
InterleavingMode *pMode );
Returns an HRESULT value that depends on the implementation of the interface.
The interleaving mode is specified in the InterleavingMode enumerated data type and is set in the IConfigInterleaving::put_Mode method.
Sets the audio preroll time and the frequency of the interleaving.
HRESULT put_ Interleaving(
const REFERENCE_TIME *prtInterleave,
const REFERENCE_TIME *prtPreroll );
Returns an HRESULT value that depends on the implementation of the interface.
An audio preroll of 750 milliseconds is recommended when authoring a file for distribution.
The default value for prtInterleave is 1000 milliseconds, however you can adjust this. The smaller the number, the larger the file overhead.
IConfigInterleaving::get_Interleaving
Sets how audio samples and video frames are to be written to disk, by specifying quality of interleaving.
HRESULT put_ Mode(
InterleavingMode mode );
Returns an HRESULT value that depends on the implementation of the interface.
Applications that require full interleaving authoring quality should specify INTERLEAVE_FULL, INTERLEAVE_CAPTURE, and INTERLEAVE_NONE settings when you will author at a later time.
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