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| Microsoft DirectShow 9.0 |
IDvdControl2::SelectKaraokeAudioPresentationMode
The SelectKaraokeAudioPresentationMode method sends karaoke auxiliary channels to the left or right speakers.
Syntax
HRESULT SelectKaraokeAudioPresentationMode( ULONG ulMode );
Parameters
ulMode
[in] Bitwise OR of DVD_KARAOKE_DOWNMIX enumeration indicating how to downmix the five karaoke channels to channels 0 and 1, which are usually output to the left and right speakers.
Return Values
Returns one of the following values.
| Return code | Description |
| S_OK | Success. |
| E_PROP_SET_UNSUPPORTED | The audio decoder does not support downmixing. |
| VFW_E_DVD_INVALIDDOMAIN | The DVD Navigator filter is in an invalid domain. |
| VFW_E_DVD_OPERATION_INHIBITED | UOP control prohibits the current operation. |
Remarks
When the DVD Navigator enters karaoke mode, it queries the audio decoder to discover whether it supports karaoke downmixing. If the decoder supports it, then channels 2 through 4 (the karaoke auxiliary channels with the guide vocals, guide melodies, and sound effects) are muted. Use this method to turn individual channels on or off and direct them to channels 0 and 1.
This method is demonstrated in the DVDSample application in CKaraokeDlg::DoModal.
The following table shows the Annex J command name to which this method name corresponds, and the domains in which this method is valid.
| Annex J Command Name | Valid Domains |
| Karaoke_Audio_Presentation_Mode_Change | DVD_DOMAIN_VideoManagerMenu DVD_DOMAIN_VideoTitleSetMenu DVD_DOMAIN_Title DVD_DOMAIN_Stop |
Requirements
Header: Declared in Strmif.h; include Dshow.h.
Library: Use Strmiids.lib.
See Also