IMediaSeeking::GetAvailable method (strmif.h)

Article
07/27/2023

[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The GetAvailable method retrieves the range of times in which seeking is efficient.

Syntax

HRESULT GetAvailable(
  [out] LONGLONG *pEarliest,
  [out] LONGLONG *pLatest
);

Parameters

[out] pEarliest

Pointer to a variable that receives the earliest time for efficient seeking.

[out] pLatest

Pointer to a variable that receives the latest time for efficient seeking.

Return value

Returns an HRESULT value. Possible values include the following.

Return code	Description
S_OK	Success.
E_NOTIMPL	Method is not supported.
E_POINTER	NULL pointer argument.

Remarks

This method is intended primarily for seeking in media streams that might have excessive latency, such as streams being sent over a network. The returned values indicate cached data that has already arrived, which can be easily seeked. It is assumed that seeking to values beyond these returned parameters will cause a delay while the application waits for the data to arrive.

All time values are expressed in the current time format. The default time format is REFERENCE_TIME units (100 nanoseconds). To change time formats, use the IMediaSeeking::SetTimeFormat method.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	strmif.h (include Dshow.h)
Library	Strmiids.lib