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Reference Number: AA-00829 Views: 1780 0 Rating/ Voters

Blocks the client application until the decode is finished.


  • int WaitForDecode(int VoiceChannel)



Which voice channel to wait on. Setting VoiceChannel equal to -1 causes a wait on all the voice channels for the port.

Return Values


No errors. The decode is finished.


The port is not valid (either CreateClient has not been called or DestroyClient has been called prior to this call).


The input VoiceChannel is not a valid one.


The timeout value associated with PROP_EX_DECODE_TIMEOUT was exceeded before a result was returned from the Speech Engine. The decode was dropped from the Engine, and the LVSpeechPort may now start a new decode request.


An exception occurred while processing the request.


Some of the API functions run asynchronously, in particular, Decode. WaitForDecode is primarily useful when Decode is called without LV_DECODE_BLOCK. In this case, Decode returns immediately, but continues processing the voice channel's audio data in a separate thread. Since client applications will eventually need the results, the clients need a way to query the port to see if Decode has finished. WaitForDecode will wait the specified time (determined by set value of PROP_EX_DECODE_TIMEOUT) for the engine to idle; check the return value to ensure the decode interaction is finished before attempting to retrieve answers from the speech port.

To wait upto a specific amount of time less than PROP_EX_DECODE_TIMEOUT use WaitForEngineToIdle where one of the input parameters is the time to wait.

See Also