IStreamBufferConfigure2::SetFFTransitionRates Method

Article
01/07/2009

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(
  [in]  DWORD dwMaxFullFrameRate,
  [in]  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 Value

The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.

Return code	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

Declared in Sbe.h.

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