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Microsoft Speech SDK Version 5.1

  • Article

ISpMMSysAudio::SetLineId

ISpMMSysAudio::SetLineId sets the line identifier associated with the multimedia device. Mixer lines are not supported for output devices.

  
    HRESULT SetLineId(
   UINT   uLineId
);

Parameters

  • uLineId
    [in] Value specifying the line identifier information.

Return values

Value Description
S_OK Function completed successfully.
E_INVALIDARG The specified uLineId is not supported on the current device.
SPERR_NOT_FOUND The audio device must have been created from a token.
E_NOTIMPL Not implemented for output devices.
FAILED(hr) Appropriate error message.

Remarks

For more information on the uses of device lines, please see the Win32 multimedia mixer API (e.g., mixerOpen, mixerGetId, mixerGetLineInfo, etc.)

For input devices, SAPI attempts to automatically identify the microphone line on the input device. On non-English versions of Windows and on a few English systems, it may not be possible for SAPI to automatically detect the correct microphone line. In this case, no error will be detected or returned. If speech input is not correctly detected, the user must set the microphone input line directly using Control Panel-->Speech properties-->Speech Recognition tab-->Audio Settings-->Properties. It may be necessary to adjust the microphone input line used on devices with multiple microphone inputs such as the SoundBlaster Live Platinum. In these cases, the automatically chosen line may not be the input preferred by the user.