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IltmmMediaInfo::get_SourceBitRate

Summary

Retrieves the calculated bit rate of the current source media file, in bits per second.

Syntax

#include "ltmm.h"

Language	Syntax
C	HRESULT IltmmMediaInfo_get_SourceBitRate(pMediaInfo, pVal)
C++	HRESULT get_SourceBitRate(pVal)

Parameters

IltmmMediaInfo *pMediaInfo

Pointer to an IltmmMediaInfo Interface.

long *pVal

Pointer to a variable to be updated with the calculated bit rate of the current source media file, in bits per second.

Returns

Value	Meaning
S_OK	The function was successful.
<> S_OK	An error occurred. Refer to the Error Codes or the HRESULT error codes in the DirectShow documentation.

Comments

The bit rate obtained by this function is calculated as follows:

BitRate = (FileSize * 8) / SourceDuration

Where FileSize and SourceDuration are retrieved using IltmmMediaInfo::get_SourceFileSize and IltmmMediaInfo::get_SourceDuration, respectively.

To get the current source media file, call IltmmMediaInfo::get_SourceFile.

The current source media file, set using IltmmMediaInfo::put_SourceFile, is the file for which the IltmmMediaInfo interface/object gets information. This function must be called before calling any of the other IltmmMediaInfo functions used for retrieving information.

Call IltmmMediaInfo::ResetSource to release the source file when it is no longer needed.