private int intDelay = 200; // Record Time in millesecond...
// Short time - increase repetet noise ...
// Long time - create echo ...
// I think 200ms is optimum ...
// If you use headphones - best time will be 500..1000ms ...
private async void btnStart_Click(object sender, RoutedEventArgs e)
{
blnStart = true;
btnStart.Visibility = Visibility.Collapsed;
btnStop.Visibility = Visibility.Visible;
textBlock.Visibility = Visibility.Visible;
mediaCaptureAudioPrimery = new Windows.Media.Capture.MediaCapture();
var settings = new Windows.Media.Capture.MediaCaptureInitializationSettings();
settings.StreamingCaptureMode = Windows.Media.Capture.StreamingCaptureMode.Audio;
settings.MediaCategory = Windows.Media.Capture.MediaCategory.Other;
settings.AudioProcessing = Windows.Media.AudioProcessing.Default; // Use only Default
await mediaCaptureAudioPrimery.InitializeAsync(settings);
recordProfile = MediaEncodingProfile.CreateWav(Windows.Media.MediaProperties.AudioEncodingQuality.Low);
while (blnStart) // Repeate untile stop ...
{
try
{
msIRAS0 = new MemoryStream();
streamIRAS0 = msIRAS0.AsRandomAccessStream(); // New Stream ...
await mediaCaptureAudioPrimery.StartRecordToStreamAsync(recordProfile, streamIRAS0); // write audio in first stream ...
await Task.Delay(intDelay);
await mediaCaptureAudioPrimery.StopRecordAsync(); // Stop first stream
await PlayThreadMethod(streamIRAS0); // Play from first stream
msIRAS1 = new MemoryStream();
streamIRAS1 = msIRAS0.AsRandomAccessStream(); // Second Stream ...
await mediaCaptureAudioPrimery.StartRecordToStreamAsync(recordProfile, streamIRAS1); // sweetch stream ... to second stream ...
await Task.Delay(intDelay);
await mediaCaptureAudioPrimery.StopRecordAsync();
await PlayThreadMethod(streamIRAS1); // Play Second Streem
}
catch (Exception ex)
{
Stop();
}
}
}
/// <summary>
/// StartRecording method
/// Start to record audio using the microphone.
/// The audio stream in stored in memory with no limit of size.
/// </summary>
/// <param name="MaxStreamSizeInBytes">
/// This parameter defines the max size of the buffer in memory. When the size of the buffer is over this limit, the
/// client create another stream and remove the previouw stream.
/// By default the value is 0, in that case the audio stream in stored in memory with no limit of size.
/// </param>
/// <param name="ThresholdDuration">
/// The duration in milliseconds for the calculation of the average audio level.
/// With this parameter you define the period during which the average level is measured.
/// If the value is 0, no buffer will be sent to Cognitive Services.
/// </param>
/// <param name="ThresholdLevel">
/// The minimum audio level average necessary to trigger the recording,
/// it's a value between 0 and 65535. You can tune this value after several microphone tests.
/// If the value is 0, no buffer will be sent to Cognitive Services.
/// </param>
/// <return>return true if successful.
/// </return>
public async System.Threading.Tasks.Task <bool> StartContinuousRecording(ulong MaxStreamSizeInBytes, UInt16 ThresholdDuration, UInt16 ThresholdLevel)
{
thresholdDuration = ThresholdDuration;
thresholdLevel = ThresholdLevel;
bool bResult = false;
maxStreamSizeInBytes = MaxStreamSizeInBytes;
if (isRecordingInitialized != true)
{
await InitializeRecording();
}
if (STTStream != null)
{
STTStream.BufferReady -= STTStream_BufferReady;
STTStream.AudioLevel -= STTStream_AudioLevel;
STTStream.Dispose();
STTStream = null;
}
STTStream = SpeechToTextMainStream.Create(maxStreamSizeInBytes, thresholdDuration, thresholdLevel);
STTStream.AudioLevel += STTStream_AudioLevel;
STTStream.BufferReady += STTStream_BufferReady;
if ((STTStream != null) && (isRecordingInitialized == true))
{
try
{
Windows.Media.MediaProperties.MediaEncodingProfile MEP = Windows.Media.MediaProperties.MediaEncodingProfile.CreateWav(Windows.Media.MediaProperties.AudioEncodingQuality.Auto);
if (MEP != null)
{
if (MEP.Audio != null)
{
uint framerate = 16000;
uint bitsPerSample = 16;
uint numChannels = 1;
uint bytespersecond = 32000;
MEP.Audio.Properties[WAVAttributes.MF_MT_AUDIO_SAMPLES_PER_SECOND] = framerate;
MEP.Audio.Properties[WAVAttributes.MF_MT_AUDIO_NUM_CHANNELS] = numChannels;
MEP.Audio.Properties[WAVAttributes.MF_MT_AUDIO_BITS_PER_SAMPLE] = bitsPerSample;
MEP.Audio.Properties[WAVAttributes.MF_MT_AUDIO_AVG_BYTES_PER_SECOND] = bytespersecond;
foreach (var Property in MEP.Audio.Properties)
{
System.Diagnostics.Debug.WriteLine("Property: " + Property.Key.ToString());
System.Diagnostics.Debug.WriteLine("Value: " + Property.Value.ToString());
if (Property.Key == new Guid("5faeeae7-0290-4c31-9e8a-c534f68d9dba"))
{
framerate = (uint)Property.Value;
}
if (Property.Key == new Guid("f2deb57f-40fa-4764-aa33-ed4f2d1ff669"))
{
bitsPerSample = (uint)Property.Value;
}
if (Property.Key == new Guid("37e48bf5-645e-4c5b-89de-ada9e29b696a"))
{
numChannels = (uint)Property.Value;
}
}
}
if (MEP.Container != null)
{
foreach (var Property in MEP.Container.Properties)
{
System.Diagnostics.Debug.WriteLine("Property: " + Property.Key.ToString());
System.Diagnostics.Debug.WriteLine("Value: " + Property.Value.ToString());
}
}
}
await mediaCapture.StartRecordToStreamAsync(MEP, STTStream);
bResult = true;
isRecording = true;
System.Diagnostics.Debug.WriteLine("Recording in audio stream...");
}
catch (Exception e)
{
System.Diagnostics.Debug.WriteLine("Exception while recording in audio stream:" + e.Message);
}
}
return(bResult);
}