IWMReaderAdvanced2::GetBufferProgress method (wmsdkidl.h)

[The feature associated with this page, Windows Media Format 11 SDK, is a legacy feature. It has been superseded by Source Reader and Sink Writer. Source Reader and Sink Writer have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use Source Reader and Sink Writer instead of Windows Media Format 11 SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The GetBufferProgress method retrieves the percentage of data that has been buffered, and the time remaining to completion.

Syntax

HRESULT GetBufferProgress(
  [out] DWORD *pdwPercent,
  [out] QWORD *pcnsBuffering
);

Parameters

[out] pdwPercent

Pointer to a DWORD containing the percentage of data that has been buffered.

[out] pcnsBuffering

Pointer to variable specifying the time remaining, in 100-nanosecond units, until all the buffering is completed.

Return value

If the method succeeds, it returns S_OK. If it fails, it returns an HRESULT error code.

Remarks

To produce meaningful results, this method must be called between the events WMT_BUFFERING_START and WMT_BUFFERING_STOP. If it is called before a WMT_BUFFERING_START event, then both parameters return zero. If it is called after WMT_BUFFERING_STOP but before a subsequent WMT_BUFFERING_START event, this method returns 100 for the percentage and zero for the buffering time, in seconds. WMT_BUFFERING_START events reset the percentage and seconds remaining to zero.

Requirements

See also

IWMReaderAdvanced2 Interface

WMT_PLAY_MODE