/// <summary>
/// SendAudioStream method
/// This method sends a SpeechToTextAudioStream towards Cognitive Services REST API.
/// Usually, the method GetAudioStream returns the SpeechToTextAudioStream (if available) then the method SendAudioStream
/// sends a SpeechToTextAudioStream towards Cognitive Services REST API.
/// </summary>
/// <param name="locale">language associated with the current buffer/recording.
/// for instance en-US, fr-FR, pt-BR, ...
/// </param>
/// <param name="stream">AudioStream which will be forwarded to REST API.
/// </param>
/// <return>The result of the SpeechToText REST API.
/// </return>
public async System.Threading.Tasks.Task <SpeechToTextResponse> SendAudioStream(string locale, SpeechToTextAudioStream stream)
{
SpeechToTextResponse r = null;
int loop = 1;
while (loop-- > 0)
{
try
{
string os = "Windows" + SpeechToText.SystemInformation.SystemVersion;
string deviceid = "b2c95ede-97eb-4c88-81e4-80f32d6aee54";
string speechUrl = SpeechUrl + "?scenarios=ulm&appid=D4D52672-91D7-4C74-8AD8-42B1D98141A5&version=3.0&device.os=" + os + "&locale=" + locale + "&format=json&requestid=" + Guid.NewGuid().ToString() + "&instanceid=" + deviceid + "&result.profanitymarkup=1&maxnbest=3";
Windows.Web.Http.HttpClient hc = new Windows.Web.Http.HttpClient();
System.Threading.CancellationTokenSource cts = new System.Threading.CancellationTokenSource();
hc.DefaultRequestHeaders.TryAppendWithoutValidation("Authorization", Token);
Windows.Web.Http.HttpResponseMessage hrm = null;
Windows.Web.Http.HttpStreamContent content = null;
content = new Windows.Web.Http.HttpStreamContent(stream.GetInputStreamAt(0));
content.Headers.ContentLength = (ulong)stream.Size;
if ((content != null) && (content.Headers.ContentLength > 0))
{
System.Diagnostics.Debug.WriteLine("REST API Post Content Length: " + content.Headers.ContentLength.ToString());
content.Headers.TryAppendWithoutValidation("ContentType", "audio/wav; codec=\"audio/pcm\"; samplerate=16000");
IProgress <Windows.Web.Http.HttpProgress> progress = new Progress <Windows.Web.Http.HttpProgress>(ProgressHandler);
hrm = await hc.PostAsync(new Uri(speechUrl), content).AsTask(cts.Token, progress);
}
if (hrm != null)
{
switch (hrm.StatusCode)
{
case Windows.Web.Http.HttpStatusCode.Ok:
var b = await hrm.Content.ReadAsBufferAsync();
string result = System.Text.UTF8Encoding.UTF8.GetString(b.ToArray());
if (!string.IsNullOrEmpty(result))
{
r = new SpeechToTextResponse(result);
}
break;
case Windows.Web.Http.HttpStatusCode.Forbidden:
string token = await RenewToken();
if (string.IsNullOrEmpty(token))
{
loop++;
}
break;
default:
int code = (int)hrm.StatusCode;
string HttpError = "Http Response Error: " + code.ToString() + " reason: " + hrm.ReasonPhrase.ToString();
System.Diagnostics.Debug.WriteLine(HttpError);
r = new SpeechToTextResponse(string.Empty, HttpError);
break;
}
}
}
catch (System.Threading.Tasks.TaskCanceledException)
{
System.Diagnostics.Debug.WriteLine("http POST canceled");
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("http POST exception: " + ex.Message);
}
finally
{
System.Diagnostics.Debug.WriteLine("http POST done");
}
}
return(r);
}
