I use google api speech. But my function always return two results: {"result": []} and "". I am looking for a solution, but I can not find. My audio file is there http://custa.web44.net/10002_en.flac
FileStream fileStream = System.IO.File.OpenRead(Server.MapPath("/10002_en.flac"));
MemoryStream memoryStream = new MemoryStream();
memoryStream.SetLength(fileStream.Length);
fileStream.Read(memoryStream.GetBuffer(), 0, (int)fileStream.Length);
byte[] BA_AudioFile = memoryStream.GetBuffer();
HttpWebRequest _HWR_SpeechToText = null;
_HWR_SpeechToText = (HttpWebRequest)HttpWebRequest.Create("https://www.google.com/speech-api/v2/recognize?output=json&lang=en-us&key=my-key");
_HWR_SpeechToText.Credentials = CredentialCache.DefaultCredentials;
_HWR_SpeechToText.Method = "POST";
_HWR_SpeechToText.ContentType = "audio/x-flac; rate=44100";
_HWR_SpeechToText.ContentLength = BA_AudioFile.Length;
Stream stream = _HWR_SpeechToText.GetRequestStream();
stream.Write(BA_AudioFile, 0, BA_AudioFile.Length);
stream.Close();
HttpWebResponse HWR_Response = (HttpWebResponse)_HWR_SpeechToText.GetResponse();
StreamReader SR_Response = new StreamReader(HWR_Response.GetResponseStream());
string responseFromServer = (SR_Response.ReadToEnd());
String[] jsons = responseFromServer.Split('\n');
Your link didn't work but it's usually the bit rate and stereo that is the problem. Use http://www.audacityteam.org/ and drop it to 16-bit PCM and convert to mono.
Here is some simpler code:
string api_key = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
string path = @"C:\temp\good-morning-google.flac";
byte[] bytes = System.IO.File.ReadAllBytes(path);
WebClient client = new WebClient();
client.Headers.Add("Content-Type", "audio/x-flac; rate=44100");
byte[] result = client.UploadData(string.Format(
"https://www.google.com/speech-api/v2/recognize?client=chromium&lang=en-us&key={0}", api_key), "POST", bytes);
string s = client.Encoding.GetString(result);
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