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LVSpeechPort::WaitForEngineToIdle

Reference Number: AA-00830 Views: 1881 0 Rating/ Voters

Blocks the client application until the port is idle (not decoding or finished decoding), returning after a specified delay if the engine is still busy decoding.

Functions

  • int WaitForEngineToIdle(int MillisecondsToWait, int VoiceChannel)

Parameters

MillisecondsToWait

The number of milliseconds to wait before returning if the Speech Port does not become idle. A timeout of 0 (== TIMEOUT_INFINITE) waits until the decode timeout specified by PROP_EX_DECODE_TIMEOUT is hit

VoiceChannel

Which VoiceChannel to wait for. A value of -1 waits on all the voice channels for the port.

Return Values

LV_SUCCESS

No errors. The port entered an idle (non-decoding) state, prior to, or during the call.

LV_INVALID_HPORT

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

LV_INVALID_SOUND_CHANNEL

The input VoiceChannel is not a valid one.

LV_TIME_OUT

Either the MillisecondsToWait timeout was exceeded or the timeout value associated with PROP_EX_DECODE_TIMEOUT was exceeded before a result was returned from the Speech Engine. The decode may still be running

LV_EXCEPTION

An exception occurred while processing the request.

Remarks

Some of the functions run asynchronously, in particular, Decode. WaitForEngineToIdle is primarily useful when Decode is called without the LV_DECODE_BLOCK flag. 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, these clients need a way to query the port to see if Decode has finished. WaitForEngineToIdle will wait the specified time for the Engine to idle; check the return value to ensure the engine is idle, indicating that decode results are available.

WaitForEngineToIdle is useful when you want to ping the engine with a 1 ms timeout but not block the thread.

To wait up to the decode timeout set by PROP_EX_DECODE_TIMEOUT use a timeout of 0 (== TIMEOUT_INFINITE)

WaitForEngineToIdle is also useful to ensure the Engine has finished initializing, prior to making calls to Decode.

See Also