public static extern int waveInAddBuffer(IntPtr hwi, ref WaveHdr pwh, int cbwh);
static void waveInCallback(IntPtr hdrvr, int uMsg, int dwUser,
ref WaveHdr wavehdr, int dwParam2)
{
// byte[] soundBuffer = new byte[bufferSize];
if (uMsg == MM_WIM_DATA)
{
// Marshal.Copy(wavehdr.lpData, soundBuffer, 0, bufferSize);
// bw.Write(soundBuffer);
waveInUnprepareHeader(hdrvr, ref wavehdr, Marshal.SizeOf(wavehdr));
waveInPrepareHeader(hdrvr, ref wavehdr, Marshal.SizeOf(wavehdr));
waveInAddBuffer(hdrvr, ref wavehdr, Marshal.SizeOf(wavehdr));
analyze(wavehdr);
}
}
static void analyze(WaveHdr wavehdr)
{
int index = 0, count = 0;
int size = wavehdr.dwBytesRecorded / sizeof(short);
short[] soundBuffer = new short[size];
Marshal.Copy(wavehdr.lpData, soundBuffer, 0, size);
while (index < size)
{
bool bit = soundBuffer[index++] > 0;
count++;
while (index < size && bit == (bool)(soundBuffer[index] > 0))
{
index++;
count++;
}
processBit(bit, count);
count = 0;
}
}
static void Main(string[] args)
{
//StreamWriter sw = new StreamWriter("output.dat", false);
//bw = new BinaryWriter(sw.BaseStream);
int ret;
IntPtr waveIn;
WaveHdr waveHeader1 = new WaveHdr();
WaveHdr waveHeader2 = new WaveHdr();
GCHandle wh1 = GCHandle.Alloc(waveHeader1, GCHandleType.Pinned);
GCHandle wh2 = GCHandle.Alloc(waveHeader2, GCHandleType.Pinned);
WaveFormat wf = new WaveFormat();
wf.wFormatTag = 1; // 1 is PCM
wf.nChannels = 1;
wf.nSamplesPerSec = sampleRate;
wf.wBitsPerSample = 16;
wf.nBlockAlign = 2;
wf.cbSize = 0;
wf.nAvgBytesPerSec = wf.nSamplesPerSec * wf.wBitsPerSample / 8;
d = new WaveDelegate(waveInCallback);
int devID = -1;
int callbackInstance = 0;
ret = waveInOpen(out waveIn, devID, ref wf, d,
ref callbackInstance, CALLBACK_FUNCTION);
if (ret != 0)
return;
waveHeader1.dwBufferLength = bufferSize;
waveHeader2.dwBufferLength = bufferSize;
waveHeader1.lpData = Marshal.AllocHGlobal(bufferSize);
waveHeader2.lpData = Marshal.AllocHGlobal(bufferSize);
ret = waveInPrepareHeader(waveIn, ref waveHeader1, Marshal.SizeOf(waveHeader1));
ret = waveInAddBuffer(waveIn, ref waveHeader1, Marshal.SizeOf(waveHeader1));
ret = waveInPrepareHeader(waveIn, ref waveHeader2, Marshal.SizeOf(waveHeader2));
ret = waveInAddBuffer(waveIn, ref waveHeader2, Marshal.SizeOf(waveHeader2));
ret = waveInStart(waveIn);
Keyboard keyboard = new Keyboard();
while (true)
{
Thread.Sleep(100);
if (keyboard.AltKeyDown == true)
break;
}
ret = waveInStop(waveIn);
ret = waveInClose(waveIn);
//bw.Close();
}
public static extern int waveInUnprepareHeader(IntPtr hWaveIn, ref WaveHdr lpWaveInHdr, int uSize);
