我正在尝试从 TCP 套接字在 C# 中进行“流式”语音识别。我遇到的问题是 SpeechRecognitionEngine.SetInputToAudioStream() 似乎需要一个可以查找的定义长度的流。现在,我能想到的实现这项工作的唯一方法是,随着更多输入的输入,在 MemoryStream 上重复运行识别器。
下面是一些代码来说明:
SpeechRecognitionEngine appRecognizer = new SpeechRecognitionEngine();
System.Speech.AudioFormat.SpeechAudioFormatInfo formatInfo = new System.Speech.AudioFormat.SpeechAudioFormatInfo(8000, System.Speech.AudioFormat.AudioBitsPerSample.Sixteen, System.Speech.AudioFormat.AudioChannel.Mono);
NetworkStream stream = new NetworkStream(socket,true);
appRecognizer.SetInputToAudioStream(stream, formatInfo);
// At the line above a "NotSupportedException" complaining that "This stream does not support seek operations."
有谁知道如何解决这个问题?它必须支持某种类型的流输入,因为它可以使用 SetInputToDefaultAudioDevice() 与麦克风一起正常工作。
谢谢,肖恩
我通过覆盖流类来实现实时语音识别:
class SpeechStreamer : Stream
{
private AutoResetEvent _writeEvent;
private List<byte> _buffer;
private int _buffersize;
private int _readposition;
private int _writeposition;
private bool _reset;
public SpeechStreamer(int bufferSize)
{
_writeEvent = new AutoResetEvent(false);
_buffersize = bufferSize;
_buffer = new List<byte>(_buffersize);
for (int i = 0; i < _buffersize;i++ )
_buffer.Add(new byte());
_readposition = 0;
_writeposition = 0;
}
public override bool CanRead
{
get { return true; }
}
public override bool CanSeek
{
get { return false; }
}
public override bool CanWrite
{
get { return true; }
}
public override long Length
{
get { return -1L; }
}
public override long Position
{
get { return 0L; }
set { }
}
public override long Seek(long offset, SeekOrigin origin)
{
return 0L;
}
public override void SetLength(long value)
{
}
public override int Read(byte[] buffer, int offset, int count)
{
int i = 0;
while (i<count && _writeEvent!=null)
{
if (!_reset && _readposition >= _writeposition)
{
_writeEvent.WaitOne(100, true);
continue;
}
buffer[i] = _buffer[_readposition+offset];
_readposition++;
if (_readposition == _buffersize)
{
_readposition = 0;
_reset = false;
}
i++;
}
return count;
}
public override void Write(byte[] buffer, int offset, int count)
{
for (int i = offset; i < offset+count; i++)
{
_buffer[_writeposition] = buffer[i];
_writeposition++;
if (_writeposition == _buffersize)
{
_writeposition = 0;
_reset = true;
}
}
_writeEvent.Set();
}
public override void Close()
{
_writeEvent.Close();
_writeEvent = null;
base.Close();
}
public override void Flush()
{
}
}
...并使用它的实例作为 SetInputToAudioStream 方法的流输入。一旦流返回长度或返回的计数小于请求的计数,识别引擎就会认为输入已完成。这将设置一个永远不会完成的循环缓冲区。
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