void Disable()
{
recognizer.Recognizing -= RecognizingHandler;
recognizer.Recognized -= RecognizedHandler;
recognizer.Canceled -= CanceledHandler;
pushStream.Close();
recognizer.Dispose();
}
void DisableSpeechRecognizer()
{
_speechRecognizer.Recognizing -= SpeechRecognizingHandler;
_speechRecognizer.Recognized -= SpeechRecognizedHandler;
_speechRecognizer.Canceled -= SpeechCanceledHandler;
_pushStream.Close();
_speechRecognizer.Dispose();
}
public async Task Stop()
{
_inputStream.Close();
if (_recognizer != null)
{
_recognizer.SessionStarted -= RecognizerStarted;
_recognizer.Recognized -= RecognizerRecognized;
await _recognizer.StopContinuousRecognitionAsync();
}
}
/// <summary>
/// Creates Recognizer with baseline model and selected language:
/// Creates a config with subscription key and selected region
/// If input source is audio file, creates recognizer with audio file otherwise with default mic
/// Waits on RunRecognition.
/// </summary>
private async Task CreateRecognizer(byte[] channel)
{
// Todo: suport users to specifiy a different region.
var config = SpeechConfig.FromSubscription(this.SubscriptionKey, this.Region);
config.SpeechRecognitionLanguage = this.RecognitionLanguage;
config.OutputFormat = OutputFormat.Detailed;
SpeechRecognizer basicRecognizer;
PushAudioInputStream pushStream = AudioInputStream.CreatePushStream();
pushStream.Write(channel);
pushStream.Close();
using (var audioInput = AudioConfig.FromStreamInput(pushStream))
{
using (basicRecognizer = new SpeechRecognizer(config, audioInput))
{
await this.RunRecognizer(basicRecognizer, stopBaseRecognitionTaskCompletionSource).ConfigureAwait(false);
}
}
}
private async Task InjectStreamIntoRecognizerAsync(PushAudioInputStream audioInputStream, BlobClient blobStream)
{
using (var stream = await blobStream.OpenReadAsync())
{
var decoder = new OpusDecoder(16000, 1);
var opus = new OpusOggReadStream(decoder, stream);
while (opus.HasNextPacket)
{
short[] packet = opus.DecodeNextPacket();
if (packet != null)
{
for (int i = 0; i < packet.Length; i++)
{
var bytes = BitConverter.GetBytes(packet[i]);
audioInputStream.Write(bytes, bytes.Length);
}
}
}
}
audioInputStream.Close();
}