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GetKaraokeChannelContent Method

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[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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.]

Note

This component is available for use in the Microsoft Windows 2000, Windows XP, and Windows Server 2003 operating systems. It may be altered or unavailable in subsequent versions.

 

The GetKaraokeChannelContent method retrieves a value that indicates the type of content in the specified karaoke channel in the specified stream.

[ iContent = ] MSWebDVD.GetKaraokeChannelContent(iStream, iChannel)

Parameters

iStream

Specifies the audio stream as an Integer.

iChannel

Specifies the channel as an Integer. The possible values for each channel are:

Value Description
0x0001 Guide Vocal 1
0x0002 Guide Vocal 2
0x0004 Guide Melody 1
0x0008 Guide Melody 2
0x0010 Guide Melody A
0x0020 Guide Melody B
0x0040 Sound Effect A
0x0080 Sound Effect B

 

Return Value

Returns an integer value whose individual bits specify the contents of the karaoke channel.

Remarks

DVD audio channel numbering is zero-based, so channels 2, 3, and 4 are the auxiliary karaoke channels. After the method returns, perform a bitwise AND operation on iContent to determine the contents of each channel. Because a single channel might have more than one type of content recorded on it, you should test for all the possible values even after a match is found.

After the user knows the contents of each channel, he or she must be able to adjust the volume or turn the individual channels on or off as needed. Implement this functionality in your application by using the KaraokeAudioPresentationMode property.

Note

To play karaoke discs, the audio decoder on the user's system must be compatible with the DirectShow 8 karaoke implementation.