/// <summary>
/// 结束会话。
/// </summary>
public string Finish()
{
StringBuilder lastResult = new StringBuilder();
int loop_count = 0;
//获取余下的识别结果
EndPointStatusEnums ep_status = EndPointStatusEnums.ISR_EP_NULL;
RecogStatusEnums rec_status = RecogStatusEnums.ISR_REC_NULL;
///最后一块数据发完之后，循环从服务器端获取结果
IsrInterop.AudioWrite(this.sessionId, IntPtr.Zero, 0, AudioStatus.ISR_AUDIO_SAMPLE_LAST, out ep_status, out rec_status);
///考虑到网络环境不好的情况下，需要对循环次数作限定
while (this.rslt_status != RecogStatusEnums.ISR_REC_STATUS_SPEECH_COMPLETE && loop_count++ < 30)
{
string str = null;
try
{
str = IsrInterop.GetResult(sessionId, out rslt_status, waitTime);
}
catch (EngineNoDataException)
{
break;
}
if (!string.IsNullOrEmpty(str))
{
this.result.Append(str);
lastResult.Append(str);
}
System.Threading.Thread.Sleep(200);
}
return(lastResult.ToString());
}
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;
}
}
}
public static extern MspErrors QISRAudioWrite(string sessionID, IntPtr waveData, uint waveLen, AudioStatus audioStatus, out EndPointStatusEnums epStatus, out RecogStatusEnums recogStatus);
public static void AudioWrite(string sessionID, IntPtr waveData, uint waveLen, AudioStatus audioStatus, out EndPointStatusEnums epStatus, out RecogStatusEnums recogStatus)
{
MspErrors result = QISRAudioWrite(sessionID, waveData, waveLen, audioStatus, out epStatus, out recogStatus);
CheckResult(result);
}
/// <summary>
/// 添加音频文件。
/// </summary>
/// <param name="buffer"></param>
/// <param name="offset"></param>
/// <param name="length"></param>
/// <param name="audio_status"></param>
/// <param name="ep_status">端点检测（End-point detected）器所处的状态</param>
public string AppendAudio(byte[] buffer, int offset, int length, AudioStatus audio_status, out EndPointStatusEnums ep_status)
{
if (length > BLOCK_LEN)
{
throw new ArgumentException("length超过了最大发送长度。", "length");
}
//返回部分结果
string partResult = null;
RecogStatusEnums rec_status;//识别器所处的状态
Marshal.Copy(buffer, 0, ptrBuffer, length);
///开始向服务器发送音频数据
IsrInterop.AudioWrite(sessionId, ptrBuffer, (uint)length, audio_status, out ep_status, out rec_status);
///服务器返回部分结果
if (rec_status == RecogStatusEnums.ISR_REC_STATUS_SUCCESS)
{//已经有结果缓存在MSC中了，可以获取了
partResult = IsrInterop.GetResult(sessionId, out this.rslt_status, waitTime);
if (!string.IsNullOrEmpty(partResult))
{
this.result.Append(partResult);
}
}
return(partResult);
}
