private string tempStr = ""; // temporary directory to store the converted audio file
private void StartRecognize(string apiRecord)
{
WavInfo wav = ClassUtils.GetWavInfo(apiRecord);
//数据量 = (采样频率 × 采样位数 × 声道数 × 时间) / 8
//if ((double)(wav.datasize * 8) / (wav.dwsamplespersec * wav.wbitspersample * wav.wchannels) > 60)
//{
// labelInfo.ForeColor = Color.HotPink;
// labelInfo.Text = "Error: The audio file is too large!";
//}
// 非8k/16k, 16bit 位深, 单声道的，进行格式转换
if (apiRecord.EndsWith(".mp3", StringComparison.CurrentCultureIgnoreCase) ||
int.Parse(wav.dwsamplespersec.ToString()) != 16000 ||
int.Parse(wav.wbitspersample.ToString()) != 16 ||
int.Parse(wav.wchannels.ToString()) != 1)
{
apiRecord = ClassUtils.Convert2Wav(apiRecord); // convert audio file to 16k，16bit wav
tempStr = apiRecord;
}
labelInfo.ForeColor = Color.SpringGreen;
labelInfo.Text = "Recognizing...";
KeyValuePair <string, string> keyVal = (KeyValuePair <string, string>)comboBoxLan.SelectedItem;
speechModel.APILanguage = keyVal.Value; // fetch the value in comboBox
if (backgroundWorker.IsBusy != true)
{
this.backgroundWorker.RunWorkerAsync(); // do the time consuming task
}
}
/// <summary>
/// 获取百度认证口令码
/// </summary>
/// <returns>百度认证口令码: accessToken</returns>
public string GetStrAccess()
{
string accessHtml = null;
string accessToken = null;
string[] accessTokenInfo = new string[2];
// string getAccessUrl = "https://openapi.baidu.com/oauth/2.0/token?grant_type=client_credentials" +
//"&client_id=" + speechModel.APIKey + "&client_secret=" + speechModel.APISecretKey;
string getAccessUrl = $"https://openapi.baidu.com/oauth/2.0/token?grant_type=client_credentials&client_id={speechModel.APIKey}&client_secret={speechModel.APISecretKey}";
try
{
HttpWebRequest getAccessRequest = WebRequest.Create(getAccessUrl) as HttpWebRequest;
getAccessRequest.ContentType = "multipart/form-data";
getAccessRequest.Accept = "*/*";
getAccessRequest.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)";
getAccessRequest.Timeout = 30000; // timeout after 30s
getAccessRequest.Method = "post";
HttpWebResponse response = getAccessRequest.GetResponse() as HttpWebResponse;
using (StreamReader strHttpResponse = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
{
accessHtml = strHttpResponse.ReadToEnd();
}
}
catch (WebException ex)
{
MessageBox.Show(ex.ToString());
}
JObject jo = JObject.Parse(accessHtml);
accessToken = jo["access_token"].ToString(); // parse to get token
int expiresIn = 2592000; // expire in: 2592000, one month
// record the token request time
long totalSeconds = ClassUtils.CurrentTime2Second();
accessTokenInfo[0] = accessToken;
accessTokenInfo[1] = (totalSeconds + expiresIn).ToString(); // the expired time
// write the token information into file
File.WriteAllLines(@".\token.dat", accessTokenInfo);
return(accessToken);
/* JObject after parsing:
* {{
* "access_token": "24.fd8c2088ac28b2722403c1acc36797e9.2592000.1487243775.282335-8317833",
* "session_key": "9mzdCSCKQicpJZhQpgi/4cz7biI1uBSCE5PlgR4wdEq4NErxkOJQA3uJq2sTjY7SSKK8J0rsxOD18B5ugOj7QClCxwDt",
* "scope": "public audio_voice_assistant_get audio_tts_post wise_adapt lebo_resource_base lightservice_public hetu_basic lightcms_map_poi kaidian_kaidian",
* "refresh_token": "25.68c6dc99cb375b786b030d156d51cccb.315360000.1782910269.282335-6432116",
* "session_secret": "443304340f3b40e766006aa319732096",
* "expires_in": 2592000
* }}
*/
}
private void Form1_Load(object sender, EventArgs e)
{
// add data to comboBox
List <KeyValuePair <string, string> > listItems = new List <KeyValuePair <string, string> >();
listItems.Add(new KeyValuePair <string, string>("English", "en"));
listItems.Add(new KeyValuePair <string, string>("中文", "zh"));
listItems.Add(new KeyValuePair <string, string>("粤语", "ct"));
comboBoxLan.DataSource = listItems;
comboBoxLan.DisplayMember = "Key";
comboBoxLan.ValueMember = "Value";
comboBoxLan.SelectedIndex = 0;
// binding the event to achieve Asynchronization
backgroundWorker.DoWork += new DoWorkEventHandler(backgroundWorker_DoWork);
backgroundWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(backgroundWorker_RunWorkerCompleted);
// obtain token from file, avoid too many requests on remote server
if (!File.Exists(@".\token.dat"))
{
accessToken = testASR.GetStrAccess(); // token file does not exist, send a request
}
else
{
string[] tokenInfo = File.ReadAllLines(@".\token.dat");
// check if the token has expired
if (Convert.ToInt32(tokenInfo[1]) > ClassUtils.CurrentTime2Second())
{
accessToken = tokenInfo[0];
}
else
{
accessToken = testASR.GetStrAccess(); // expired, request again to refresh
}
}
speechModel.APIAccessToken = accessToken; // update token in model
// Show tips when mouse hovers
ToolTip toolTip = new ToolTip();
toolTip.SetToolTip(buttonRecognize, "Select a file to recognize");
toolTip.SetToolTip(buttonRecord, "Record/Stop audio");
toolTip.SetToolTip(buttonRead, "Start reading");
toolTip.SetToolTip(buttonReadPause, "Pause reading");
toolTip.SetToolTip(buttonReadStop, "Stop reading");
toolTip.SetToolTip(textBoxFile, "Click to select a audio file");
toolTip.SetToolTip(comboBoxLan, "Select the target language");
toolTip.SetToolTip(richTextBoxResult, "Recognition text or Text to be Read");
}
public static string checkAudio(string fileName)
{
WavInfo wav = ClassUtils.GetWavInfo(fileName);
//数据量 = (采样频率 × 采样位数 × 声道数 × 时间) / 8
// 非8k/16k, 16bit 位深, 单声道的，进行格式转换
if (fileName.EndsWith(".mp3", StringComparison.CurrentCultureIgnoreCase) ||
int.Parse(wav.dwsamplespersec.ToString()) != 16000 ||
int.Parse(wav.wbitspersample.ToString()) != 16 ||
int.Parse(wav.wchannels.ToString()) != 1)
{
fileName = ClassUtils.Convert2Wav(fileName); // convert audio file to 16k，16bit wav
}
return(fileName);
}