public static void Stop(SpeechHelper.SpeechToTextCallbackDelegate del)
{
// get the last chunk of speech
int len = mic.GetData(speechBuffer);
// stop listening
mic.Stop();
// remove the mic eventhandler
mic.BufferReady -= MicBufferReady;
initializedBufferReadyEvent = false;
// trace the operation
TraceHelper.AddMessage(String.Format("Final Frame: {0} bytes of speech", len));
// create a properly sized copy of the last buffer
byte[] speechChunk = new byte[len];
Array.Copy(speechBuffer, speechChunk, len);
// add the last speech buffer to the folder
speechBufferList.Add(speechChunk);
// if the encode flag is set, encode the chunk before sending it
if (encode)
{
// do this on a background thread because it is CPU-intensive
ThreadPool.QueueUserWorkItem(delegate
{
// create a new mutex object for this frame
AutoResetEvent bufferMutex = new AutoResetEvent(false);
bufferMutexList.Add(bufferMutex);
// encode the frame
TraceHelper.AddMessage(String.Format("Final Frame: About to encode speech"));
byte[] encodedBuf = EncodeSpeech(speechChunk, speechChunk.Length);
TraceHelper.AddMessage(String.Format("Final Frame: Encoded down to {0} bytes", encodedBuf.Length));
// wait until the previous frame has been sent
int frameIndex = bufferMutexList.Count - 1;
if (frameIndex > 0)
{
bufferMutexList[frameIndex - 1].WaitOne();
}
// send the last frame and retrieve the response
TraceHelper.AddMessage(String.Format("Sending Final Frame: {0} bytes", encodedBuf.Length));
NetworkHelper.EndSpeech(encodedBuf, encodedBuf.Length, del, new NetworkDelegate(NetworkCallback));
// repeat the sentence back to the user
PlaybackSpeech();
});
}
else
{
// send the operation immediately
TraceHelper.AddMessage(String.Format("Sending Final Frame: {0} bytes", speechChunk.Length));
NetworkHelper.EndSpeech(speechChunk, speechChunk.Length, del, new NetworkDelegate(NetworkCallback));
// play back the speech immediately
PlaybackSpeech();
}
}
private static void MicBufferReady(object sender, EventArgs e)
{
// get the data from the mic
int len = mic.GetData(speechBuffer);
numBytes += len;
// make a copy of the frame index and then increment it
int frameIndex = frameCounter++;
// trace the operation
TraceHelper.AddMessage(String.Format("Frame {0}: {1} bytes of speech", frameIndex, len));
// create a properly sized copy of the speech buffer
byte[] speechChunk = new byte[len];
Array.Copy(speechBuffer, speechChunk, len);
// add the chunk to the buffer folder
speechBufferList.Add(speechChunk);
// send the chunk to the service
try
{
// if the encode flag is set, encode the chunk before sending it
if (encode)
{
// do this on a background thread because it is CPU-intensive
ThreadPool.QueueUserWorkItem(delegate
{
// create a new mutex object for this frame
AutoResetEvent bufferMutex = new AutoResetEvent(false);
bufferMutexList.Add(bufferMutex);
// encode the frame
TraceHelper.AddMessage(String.Format("Frame {0}: About to encode speech", frameIndex));
byte[] encodedBuf = EncodeSpeech(speechChunk, speechChunk.Length);
TraceHelper.AddMessage(String.Format("Frame {0}: Encoded down to {1} bytes", frameIndex, encodedBuf.Length));
// wait until the previous frame has been sent
if (frameIndex > 0)
{
bufferMutexList[frameIndex - 1].WaitOne();
}
// send the frame
TraceHelper.AddMessage(String.Format("Sending Frame {0}: {1} bytes", frameIndex, encodedBuf.Length));
NetworkHelper.SendSpeech(encodedBuf, encodedBuf.Length, null, new NetworkDelegate(NetworkCallback));
// set the current frame's mutex
bufferMutex.Set();
});
}
else
{
// just send the frame
TraceHelper.AddMessage(String.Format("Sending Frame {0}: {1} bytes", frameIndex, speechChunk.Length));
NetworkHelper.SendSpeech(speechChunk, speechChunk.Length, null, new NetworkDelegate(NetworkCallback));
}
}
catch (Exception ex)
{
// stop listening
mic.Stop();
// remove the mic eventhandler
mic.BufferReady -= MicBufferReady;
initializedBufferReadyEvent = false;
// trace the exception
TraceHelper.AddMessage(String.Format("Mic buffer ready: ex: {0}", ex.Message));
speechOperationInProgress = false;
return;
}
#if DEBUG
// signal the caller that the chunk has been sent
speechStateDelegate.DynamicInvoke(SpeechHelper.SpeechState.Listening, numBytes.ToString());
#endif
}
