private void startRecordingButton_Click(object sender, EventArgs e)
{
if (wavRecorder == null)
{
wavRecorder = new WAVRecorder();
wavRecorder.SampleRate = 16000;
wavRecorder.StorageDuration = 10;
}
if (!wavRecorder.IsRecording)
{
recognizeButton.Enabled = false;
recordingButton.Text = "Stop recording";
wavRecorder.Start();
}
else
{
wavRecorder.Stop();
byte[] recordedBytes = wavRecorder.GetAllRecordedBytes();
if (recordedBytes != null)
{
if (recordedBytes.Length > 0)
{
WAVSound sound = new WAVSound("", wavRecorder.SampleRate, wavRecorder.NumberOfChannels, wavRecorder.NumberOfBitsPerSample);
sound.AppendSamplesAsBytes(recordedBytes);
sound.SetMaximumNonClippingVolume();
soundVisualizer.SetSound(sound);
}
}
recordingButton.Text = "Start recording";
recognizeButton.Enabled = true;
}
}
private void recordToolStripButton_Click(object sender, EventArgs e)
{
if (recordToolStripButton.Text.Contains("Start")) // A bit ugly, but OK
{
recordToolStripButton.Text = "Stop recording";
wavRecorder = new WAVRecorder();
wavRecorder.DeviceId = 0;
wavRecorder.Start();
}
else
{
wavRecorder.Stop();
byte[] recordedBytes = wavRecorder.GetAllRecordedBytes();
if (recordedBytes != null)
{
if (recordedBytes.Length > 0)
{
WAVSound sound = new WAVSound("", wavRecorder.SampleRate, wavRecorder.NumberOfChannels, wavRecorder.NumberOfBitsPerSample);
sound.AppendSamplesAsBytes(recordedBytes);
soundVisualizer.SetSound(sound);
}
}
recordToolStripButton.Text = "Start recording";
playSoundButton.Enabled = true;
saveSoundToolStripMenuItem.Enabled = true;
}
}
private void recordingButton_Click(object sender, EventArgs e)
{
if (!recording)
{
recording = true;
recorder.Start();
recordingButton.Text = "Stop recording";
}
else
{
recorder.Stop();
byte[] recordedBytes = recorder.GetAllRecordedBytes();
if (recordedBytes != null)
{
if (recordedBytes.Length > 0)
{
WAVSound sound = new WAVSound("", recorder.SampleRate, recorder.NumberOfChannels, recorder.NumberOfBitsPerSample);
sound.AppendSamplesAsBytes(recordedBytes);
soundVisualizer.SetSound(sound);
}
}
recordingButton.Text = "Start recording";
saveSoundToolStripMenuItem.Enabled = true;
raiseVolumeButton.Enabled = true;
reduceVolumeButton.Enabled = true;
playButton.Enabled = true;
playButton.Enabled = true;
filterToolStrip.Enabled = true;
recording = false;
}
}
private void RunLoop()
{
Thread.Sleep(1);
DateTime utteranceStartDateTime = DateTime.Now; // Just needed for initialization.
DateTime utteranceEndDateTime = DateTime.MinValue; // Just needed for initialization.
DateTime previousUtteranceStartDateTime = DateTime.MinValue;
DateTime previousUtteranceEndDateTime = DateTime.MinValue;
DateTime recordingStartDateTime;
DateTime recordingEndDateTime;
double utteranceStartTime = 0; // In seconds, measured from the start of the current recording. (=0 just for initialization).
double utteranceEndTime;
while (running)
{
Thread.Sleep(millisecondRecordingInterval);
byte[] soundData = wavRecorder.GetAllRecordedBytes(out recordingStartDateTime, out recordingEndDateTime);
if (soundData != null)
{
if (soundData.Length > 0)
{
WAVSound sound = new WAVSound("", wavRecorder.SampleRate, wavRecorder.NumberOfChannels, wavRecorder.NumberOfBitsPerSample);
sound.AppendSamplesAsBytes(soundData);
if (showSoundStream)
{
if (!displayBusy)
{
WAVSound soundToDisplay = sound.Copy(); // 20171207: Make a new copy here, since the code below may process the sound before visualization is completed.
if (InvokeRequired)
{
this.BeginInvoke(new MethodInvoker(() => ShowSound(soundToDisplay)));
}
else
{
ShowSound(soundToDisplay);
}
}
}
// Next, remove all parts of the sound that have already been recognized, if any:
if (previousUtteranceEndDateTime > recordingStartDateTime)
{
double extractionStartTime = (previousUtteranceEndDateTime - recordingStartDateTime).TotalSeconds;
double extractionEndTime = sound.GetDuration();
sound = sound.Extract(extractionStartTime, extractionEndTime);
// Debug code, remove
/* if (sound == null) // Should not happen, unless the recognition thread is stopped using a breakpoint.
* {
*
* } */
}
if (!inUtterance)
{
utteranceStartTime = sound.GetFirstTimeAboveThreshold(0, movingAverageLength, detectionThreshold);
if (utteranceStartTime > 0)
{
double duration = sound.GetDuration();
double timeToEnd = duration - utteranceStartTime;
long ticksToEnd = TICKS_PER_SECOND * (long)(timeToEnd);
utteranceStartDateTime = recordingEndDateTime.Subtract(new TimeSpan(ticksToEnd));
if (utteranceStartDateTime > previousUtteranceEndDateTime) // True (by construction) the FIRST time.
{
inUtterance = true;
long utteranceStartTimeAsTicks = (long)(TICKS_PER_SECOND * utteranceStartTime); // Corrected 20170907 (1000000 -> 10000000)
utteranceStartDateTime = recordingStartDateTime.Add(new TimeSpan(utteranceStartTimeAsTicks));
}
}
}
else
{
double duration = sound.GetDuration();
WAVSound endOfSound = sound.Extract(duration - detectionSilenceInterval, duration);
double startTimeInEndOfSound = endOfSound.GetFirstTimeAboveThreshold(0, movingAverageLength, detectionThreshold);
if (startTimeInEndOfSound < 0) // <=> silence at the end of the sound
{
inUtterance = false;
utteranceEndDateTime = recordingEndDateTime; // recordingStartDateTime.Add(new TimeSpan(utteranceEndTimeAsTicks));
previousUtteranceStartDateTime = utteranceStartDateTime;
previousUtteranceEndDateTime = utteranceEndDateTime;
// Monitor.Enter(recognitionLockObject);
if (!recognizerBusy)
{
recognizerBusy = true;
WAVSound soundToRecognize = sound.Extract(utteranceStartTime - extractionMargin, duration).Copy();
// Monitor.Exit(recognitionLockObject);
RunRecognizer(soundToRecognize);
}
}
}
}
}
}
}