IStreamBufferConfigure2::SetFFTransitionRates
| Microsoft DirectShow 9.0 |
IStreamBufferConfigure2::SetFFTransitionRates
This topic applies to Windows XP Service Pack 2 only.
The SetFFTransitionRates method sets the behavior of fast-forward play ("trick mode") in the Stream Buffer Engine.
Syntax
HRESULT SetFFTransitionRates(
DWORD
dwMaxFullFrameRate
DWORD
dwMaxNonSkippingRate
);
Parameters
dwMaxFullFrameRate
[in] Maximum playback rate for full-frame playback. The value must be greater than 1. The default value is 4.
dwMaxNonSkippingRate
[in] Maximum playback rate for key-frame playback. The value must be greater than dwFullFrameRate. The default value is 6.
Return Values
The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.
| Value | Description |
| S_OK | The method succeeded. |
Remarks
At higher playback rates, the Stream Buffer Engine drops frames in order to maintain the desired rate. The following table shows how the values of dwMaxFullFrameRate and dwMaxNonSkippingRate affect playback.
| Playback rate | Behavior |
| rate <= dwMaxFullFrameRate | Full-frame playback: All frames are sent. |
| dwMaxFullFrameRate < rate <= dwMaxNonSkippingRate | Key-frame playback: All key frames are sent. Delta frames are skipped. |
| dwMaxNonSkippingRate < rate | Key-frame playback with seeking: All delta frames are skipped, and some key frames are skipped. The number of skipped key frames is proportional to the rate. |
The decoder may drop frames as well, depending on the data rate, the monitor refresh rate, and the CPU load.
Requirements
Header: Include Sbe.h.
See Also