private void RenewAccessToken()
{
AccessTokenInfo newAccessToken = HttpPost(AccessUri, this.request);
//swap the new token with old one
//Note: the swap is thread unsafe
this.token = newAccessToken;
Console.WriteLine(string.Format("Renewed token for user: {0} is: {1}",
this.clientId,
this.token.access_token));
}
public Authentication(string clientId, string clientSecret)
{
this.clientId = clientId;
this.clientSecret = clientSecret;
/*
* If clientid or client secret has special characters, encode before sending request
*/
this.request = string.Format("grant_type=client_credentials&client_id={0}&client_secret={1}&scope={2}",
HttpUtility.UrlEncode(clientId),
HttpUtility.UrlEncode(clientSecret),
HttpUtility.UrlEncode("https://speech.platform.bing.com"));
this.token = HttpPost(AccessUri, this.request);
// renew the token every specfied minutes
accessTokenRenewer = new Timer(new TimerCallback(OnTokenExpiredCallback),
this,
TimeSpan.FromMinutes(RefreshTokenDuration),
TimeSpan.FromMilliseconds(-1));
}
private AccessTokenInfo HttpPost(string accessUri, string requestDetails)
{
//Prepare OAuth request
WebRequest webRequest = WebRequest.Create(accessUri);
webRequest.ContentType = "application/x-www-form-urlencoded";
webRequest.Method = "POST";
byte[] bytes = Encoding.ASCII.GetBytes(requestDetails);
webRequest.ContentLength = bytes.Length;
using (Stream outputStream = webRequest.GetRequestStream())
{
outputStream.Write(bytes, 0, bytes.Length);
}
using (WebResponse webResponse = webRequest.GetResponse())
{
DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(AccessTokenInfo));
//Get deserialized object from JSON stream
AccessTokenInfo token = (AccessTokenInfo)serializer.ReadObject(webResponse.GetResponseStream());
return(token);
}
}
public SpeechResult SpeechToText(string appId, string key)
{
AccessTokenInfo token;
string headerValue;
Authentication auth = new Authentication(appId, key);
string requestUri = "https://speech.platform.bing.com/recognize";
/* URI Params. Refer to the README file for more information. */
requestUri += @"?scenarios=smd"; // websearch is the other main option.
requestUri += @"&appid=D4D52672-91D7-4C74-8AD8-42B1D98141A5"; // You must use this ID.
requestUri += @"&locale=en-US"; // We support several other languages. Refer to README file.
requestUri += @"&device.os=wp7";
requestUri += @"&version=3.0";
requestUri += @"&format=json";
requestUri += @"&instanceid=565D69FF-E928-4B7E-87DA-9A750B96D9E3";
requestUri += @"&requestid=" + Guid.NewGuid().ToString();
string host = @"speech.platform.bing.com";
string contentType = @"audio/wav; codec=""audio/pcm""; samplerate=16000";
/*
* Input your own audio file or use read from a microphone stream directly.
*/
var localStorage = PCLStorage.FileSystem.Current.LocalStorage.Path;
string audioFile = localStorage + "/SmartCoffee.wav";
string responseString;
FileStream fs = null;
#if __ANDROID__
var path = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
audioFile = System.IO.Path.Combine(path, "SmartCoffee.wav");
#endif
token = auth.GetAccessToken();
Console.WriteLine("Token: {0}\n", token.access_token);
/*
* Create a header with the access_token property of the returned token
*/
headerValue = "Bearer " + token.access_token;
Console.WriteLine("Request Uri: " + requestUri + Environment.NewLine);
HttpWebRequest request = null;
request = (HttpWebRequest)HttpWebRequest.Create(requestUri);
request.SendChunked = true;
request.Accept = @"application/json;text/xml";
request.Method = "POST";
request.ProtocolVersion = HttpVersion.Version11;
request.Host = host;
request.ContentType = contentType;
request.Headers["Authorization"] = headerValue;
using (fs = new FileStream(audioFile, FileMode.Open, FileAccess.Read))
{
/*
* Open a request stream and write 1024 byte chunks in the stream one at a time.
*/
byte[] buffer = null;
int bytesRead = 0;
using (Stream requestStream = request.GetRequestStream())
{
/*
* Read 1024 raw bytes from the input audio file.
*/
buffer = new Byte[checked ((uint)Math.Min(1024, (int)fs.Length))];
while ((bytesRead = fs.Read(buffer, 0, buffer.Length)) != 0)
{
requestStream.Write(buffer, 0, bytesRead);
}
// Flush
requestStream.Flush();
}
/*
* Get the response from the service.
*/
using (WebResponse response = request.GetResponse())
{
Console.WriteLine(((HttpWebResponse)response).StatusCode);
using (StreamReader sr = new StreamReader(response.GetResponseStream()))
{
responseString = sr.ReadToEnd();
}
Console.WriteLine(responseString);
var root = JsonConvert.DeserializeObject <RootObject>(responseString);
return(root.results[0]);
}
}
}
