FormatAudioGetByIndex Method (MComposerClass)

VB.Net
C#
Delphi
C++

Public Overridable Sub FormatAudioGetByIndex( _
   ByVal _eFormatType As eMFormatType, _
   ByVal _nIndex As Integer, _
   ByRef _pAudProps As M_AUD_PROPS, _
   ByRef _pbsName As String _
)

public virtual void FormatAudioGetByIndex( 
   eMFormatType _eFormatType,
   int _nIndex,
   out M_AUD_PROPS _pAudProps,
   out string _pbsName
)

public procedure FormatAudioGetByIndex( 
    _eFormatType: eMFormatType;
    _nIndex: Integer;
   Out  _pAudProps: M_AUD_PROPS;
   Out  _pbsName: String
); virtual;

public: virtual void FormatAudioGetByIndex( 
   eMFormatType _eFormatType,
   int _nIndex,
   [PARAMFLAG::Out] M_AUD_PROPS _pAudProps,
   [PARAMFLAG::Out] BSTR* _pbsName
)

Parameters

_eFormatType: type of the format
_nIndex: index of the format
_pAudProps: properties of current audio format (bitrate, number of channels, value of samples per second and number of tracks)
_pbsName: full name of format (for example, "44100 Hz, 6 Ch, 16-bit")

Here is example of how to set standard format to the playlist:

Visual Basic
C#
Delphi

Dim myPlaylist As New MPlaylistClass()
Dim audProps As New M_AUD_PROPS()
Dim strFormat As String
Dim nCount As Integer
myPlaylist.FormatAudioGetCount(nCount)
myPlaylist.FormatAudioGetByIndex(eMFormatType.eMFT_Convert, nCount - 1, audProps, strFormat)
myPlaylist.FormatAudioSet(eMFormatType.eMFT_Convert, audProps)

MPlaylistClass myPlaylist = new MPlaylistClass();
M_AUD_PROPS audProps = new M_AUD_PROPS();
string strFormat;
int nCount;
myPlaylist.FormatAudioGetCount(out nCount);
myPlaylist.FormatAudioGetByIndex(eMFormatType.eMFT_Convert, nCount - 1, out audProps, out strFormat);
myPlaylist.FormatAudioSet(eMFormatType.eMFT_Convert, ref audProps);

var
myPlaylist: MPlaylist;
myFormat: IMFormat;
nCount: integer;
audProps: M_AUD_PROPS;
strFormat: string;
begin
myPlaylist:= CreateComObject(CLASS_MPlaylist) as MPlaylist;
myFormat := myPlaylist as IMFormat;
myFormat.FormatAudioGetCount(nCount);
myFormat.FormatAudioGetByIndex(eMFT_Convert, nCount-2, audProps, strFormat);
myFormat.FormatAudioSet(eMFT_Convert, audProps);
end;

Reference

MComposerClass Class
MComposerClass Members