public SpeechRecognitionSession CreateSession()
{
SpeechRecognitionSession session = new SpeechRecognitionSession(this.recog_grammar, this.recog_params);
session.Open();
return(session);
}
protected override string RecognizeInternal(BackgroundWorker bw, string fileName)
{
if (!File.Exists(fileName))
{
throw new FileNotFoundException("文件不存在。", fileName);
}
string ext = Path.GetExtension(fileName).ToLower();
if (ext != ".wav" && ext != ".pcm")
{
throw new FormatException("音频文件格式不受支持，仅支持wav或pcm。");
}
SpeechRecognitionSession session = null;
FileStream stream = null;
try
{
//打开文件
stream = new FileStream(fileName, FileMode.Open);
if (Path.GetExtension(fileName).ToLower() == ".wav")
{
stream.Position = 44;
}
session = client.CreateSession();
byte[] buffer = new byte[session.BlockMaxLength];
AudioStatus audio_status = AudioStatus.ISR_AUDIO_SAMPLE_INIT;
// 发送音频数据，获取语音听写结果
while (audio_status != AudioStatus.ISR_AUDIO_SAMPLE_LAST)
{
if (bw != null && bw.CancellationPending)
{
break;
}
int length = stream.Read(buffer, 0, buffer.Length);
audio_status = (length == buffer.Length) ? AudioStatus.ISR_AUDIO_SAMPLE_CONTINUE : AudioStatus.ISR_AUDIO_SAMPLE_LAST;
//端点检测器所处的状态
EndPointStatusEnums ep_status;
string partResult = session.AppendAudio(buffer, 0, length, audio_status, out ep_status);
if (!string.IsNullOrEmpty(partResult) && bw != null)
{
bw.ReportProgress(0, partResult);
}
if (ep_status == EndPointStatusEnums.ISR_EP_AFTER_SPEECH)
{//检测到音频后端点，结束音频发送
break;
}
//如果是实时采集音频，可以省略此操作。5KB大小的16KPCM持续的时间是160毫秒
System.Threading.Thread.Sleep(160);
}
string lastResult = session.Finish();
if (!string.IsNullOrEmpty(lastResult) && bw != null)
{
bw.ReportProgress(0, lastResult);
}
return(session.Result);
}
catch (Exception)
{
return(session.Result);
}
finally
{
session.Dispose();
session = null;
}
}
protected override string RecognizeInternal(BackgroundWorker bw, string uriString)
{
bool finished = false;
SpeechRecognitionSession session = null;
EventHandler <WaveInEventArgs> handler = delegate(object sender, WaveInEventArgs e)
{
try
{
AudioStatus status = AudioStatus.ISR_AUDIO_SAMPLE_CONTINUE;
EndPointStatusEnums ep_status = EndPointStatusEnums.ISR_EP_NULL;
///开始向服务器发送音频数据
string partResult = session.AppendAudio(e.Buffer, 0, e.BytesRecorded, status, out ep_status);
if (!string.IsNullOrEmpty(partResult))
{
this.OnResultArrived(new ResultArrivedEventArgs(partResult));
}
if (ep_status == EndPointStatusEnums.ISR_EP_AFTER_SPEECH)
{//检测到音频后端点，结束音频发送
finished = true;
}
}
catch (Exception ex)
{
}
finally
{
}
};
try
{
session = client.CreateSession();
wis.DataAvailable += handler;
wis.StartRecording();
while (true)
{
if (bw != null && bw.CancellationPending)
{
break;
}
if (finished)
{
break;
}
Thread.Sleep(200);
}
wis.DataAvailable -= handler;
wis.StopRecording();
string lastResult = session.Finish();
if (!string.IsNullOrEmpty(lastResult))
{
this.OnResultArrived(new ResultArrivedEventArgs(lastResult));
}
string result = session.Result;
return(result);
}
catch (Exception ex)
{
return(session.Result);
}
finally
{
if (session != null)
{
session.Dispose();
session = null;
}
}
}
protected override string RecognizeInternal(BackgroundWorker bw, string httpAudioUrl)
{
SpeechRecognitionSession session = null;
HttpWebRequest webRequest = null;
HttpWebResponse resp = null;
Stream stream = null;
try
{
//连接音频源
webRequest = WebRequest.Create(httpAudioUrl) as HttpWebRequest;
resp = (HttpWebResponse)webRequest.GetResponse();
stream = resp.GetResponseStream();
session = client.CreateSession();
byte[] buffer = new byte[session.BlockMaxLength];
AudioStatus audio_status = AudioStatus.ISR_AUDIO_SAMPLE_INIT;
// 发送音频数据，获取语音听写结果
while (audio_status != AudioStatus.ISR_AUDIO_SAMPLE_LAST)
{
if (bw != null && bw.CancellationPending)
{
break;
}
int length = stream.Read(buffer, 0, buffer.Length);
//audio_status = (length == buffer.Length) ? AudioStatus.ISR_AUDIO_SAMPLE_CONTINUE : AudioStatus.ISR_AUDIO_SAMPLE_LAST;
audio_status = AudioStatus.ISR_AUDIO_SAMPLE_CONTINUE;
//端点检测器所处的状态
EndPointStatusEnums ep_status;
string partResult = session.AppendAudio(buffer, 0, length, audio_status, out ep_status);
if (!string.IsNullOrEmpty(partResult) && bw != null)
{
bw.ReportProgress(0, partResult);
}
if (ep_status == EndPointStatusEnums.ISR_EP_AFTER_SPEECH)
{//检测到音频后端点，结束音频发送
break;
}
//如果是实时采集音频，可以省略此操作。5KB大小的16KPCM持续的时间是160毫秒
System.Threading.Thread.Sleep(160);
}
string lastResult = session.Finish();
if (!string.IsNullOrEmpty(lastResult) && bw != null)
{
bw.ReportProgress(0, lastResult);
}
return(session.Result);
}
catch (WebException ex)
{
if (ex.Status != WebExceptionStatus.RequestCanceled)
{//不是视频流结束
throw ex;
}
//正常结束
return(session.Result);
}
catch (Exception ex)
{
return(session.Result);
}
finally
{
session.Dispose();
session = null;
if (stream != null)
{
stream.Close();
stream = null;
}
if (resp != null)
{
resp.Close();
resp = null;
}
if (webRequest != null)
{
webRequest = null;
}
}
}