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我想从使用DirectSound的行中捕获原始数据。C#DirectSound - 捕获缓冲区不连续
我的问题是,从缓冲区到另一个数据只是不一致,如果我捕获一个正弦,我看到从我的最后一个缓冲区和新的跳转。为了检测这一点,我使用的图形控件从新划清最后一个缓冲区的第一个500元和500元:
http://img199.imageshack.us/img199/206/demodsnap.jpg
我初始化我的缓冲区是这样的:
format = new WaveFormat {
SamplesPerSecond = 44100,
BitsPerSample = (short)bitpersample,
Channels = (short)channels,
FormatTag = WaveFormatTag.Pcm
};
format.BlockAlign = (short)(format.Channels * (format.BitsPerSample/8));
format.AverageBytesPerSecond = format.SamplesPerSecond * format.BlockAlign;
_dwNotifySize = Math.Max(4096, format.AverageBytesPerSecond/8);
_dwNotifySize -= _dwNotifySize % format.BlockAlign;
_dwCaptureBufferSize = NUM_BUFFERS * _dwNotifySize; // my capture buffer
_dwOutputBufferSize = NUM_BUFFERS * _dwNotifySize/channels; // my output buffer
设置我的一个通知,在一半的缓冲区和一个底:
_resetEvent = new AutoResetEvent(false);
_notify = new Notify(_dwCapBuffer);
bpn1 = new BufferPositionNotify();
bpn1.Offset = ((_dwCapBuffer.Caps.BufferBytes)/2) - 1;
bpn1.EventNotifyHandle = _resetEvent.SafeWaitHandle.DangerousGetHandle();
bpn2 = new BufferPositionNotify();
bpn2.Offset = (_dwCapBuffer.Caps.BufferBytes) - 1;
bpn2.EventNotifyHandle = _resetEvent.SafeWaitHandle.DangerousGetHandle();
_notify.SetNotificationPositions(new BufferPositionNotify[] { bpn1, bpn2 });
observer.updateSamplerStatus("Events listener initialization complete!\r\n");
这里是浩w我处理事件。
/* Process thread */
private void eventReceived()
{
int offset = 0;
_dwCaptureThread = new Thread((ThreadStart)delegate
{
_dwCapBuffer.Start(true);
while (isReady)
{
_resetEvent.WaitOne(); // Notification received
/* Read the captured buffer */
Array read = _dwCapBuffer.Read(offset, typeof(short), LockFlag.None, _dwOutputBufferSize - 1);
observer.updateTextPacket("Buffer: " + count.ToString() + " # " + read.GetValue(read.Length - 1).ToString() + " # " + read.GetValue(0).ToString() + "\r\n");
/* Print last/new part of the buffer to the debug graph */
short[] graphData = new short[1001];
Array.Copy(read, graphData, 1000);
db.SetBufferDebug(graphData, 500);
observer.updateGraph(db.getBufferDebug());
offset = (offset + _dwOutputBufferSize) % _dwCaptureBufferSize;
/* Out buffer not used */
/*_dwDevBuffer.Write(0, read, LockFlag.EntireBuffer);
_dwDevBuffer.SetCurrentPosition(0);
_dwDevBuffer.Play(0, BufferPlayFlags.Default);*/
}
_dwCapBuffer.Stop();
});
_dwCaptureThread.Start();
}
有没有建议吗?我确定我在事件处理的某个地方失败了,但我找不到在哪里。
我开发了使用WaveIn API的相同应用程序,它运行良好。
非常感谢......
我有点解决了它,这是我如何打印出图表的错误: -/ 在任何情况下,我仍然有缓冲区之间的incogruens,但是真的很小。现在我已经切换到NAudio库,它完美的工作! – Wizche 2009-11-07 13:32:19