/////////////////////////////////////////////////////////////////////////
// HighPassWave
//
// 高通滤波
//
// 参数：Format —— 波形音频格式结构WAVEFORMATEX
// lpData —— 波形音频数据块指针
// dwDataLength —— 波形音频数据块大小
// fFrequencyPass —— 滤波频率阈值
//
// 无返回值
/////////////////////////////////////////////////////////////////////////
unsafe public static void HighPassWave(WAVEFORMATEX Format, byte[] data,
int dwDataLength, float fFrequencyPass)
{
fixed(byte *lpData = data)
{
float fParam0, fParam1, fParam2;
int nSamplesPerSec = Format.nSamplesPerSec;
fParam0 = (20.0f / fFrequencyPass + 1.0f / nSamplesPerSec) /
(2.0f / fFrequencyPass + 1.0f / nSamplesPerSec);
fParam1 = (-20.0f / fFrequencyPass + 1.0f / nSamplesPerSec) /
(2.0f / fFrequencyPass + 1.0f / nSamplesPerSec);
fParam2 = (1.0f / nSamplesPerSec - 2.0f / fFrequencyPass) /
(2.0f / fFrequencyPass + 1.0f / nSamplesPerSec);
PassWave(Format, lpData, dwDataLength, fFrequencyPass,
fParam0, fParam1, fParam2);
}
}
/////////////////////////////////////////////////////////////////////////
// LowPassWave
//
// 低通滤波
//
// 参数：Format —— 波形音频格式结构WAVEFORMATEX
// lpData —— 波形音频数据块指针
// dwDataLength —— 波形音频数据块大小
// fFrequencyPass —— 滤波频率阈值
//
// 无返回值
/////////////////////////////////////////////////////////////////////////
unsafe public static void LowPassWave(WAVEFORMATEX Format, byte[] data,
int dwDataLength, float fFrequencyPass)
{
fixed(byte* lpData=data)
{
float fParam0,fParam1,fParam2;
int nSamplesPerSec = Format.nSamplesPerSec;
fParam0=(1.0f/nSamplesPerSec)/(2.0f/fFrequencyPass+
1.0f/nSamplesPerSec);
fParam1=fParam0;
fParam2=(1.0f/nSamplesPerSec-2.0f/fFrequencyPass)/
(2.0f/fFrequencyPass+1.0f/nSamplesPerSec);
PassWave(Format, lpData, dwDataLength, fFrequencyPass,
fParam0, fParam1, fParam2);
}
}
public WaveOut(int index,WAVEFORMATEX format,int buffersize,int buffer_count)//波形输出
{
this.m_fmt=format;
this.m_outdex=index;
m_buffersize=buffersize;
m_outcb=new waveProc(this.waveOutProc);
Debug.Assert(buffer_count>0 && buffer_count<65535);
this.m_hs=new WAVEHDR[buffer_count];
this.gchs=new GCHandle[buffer_count];
for(int i=0;i<buffer_count;i++)
{
gchs[i]=GCHandle.Alloc(new byte[buffersize],GCHandleType.Pinned);
WAVEHDR hdr=new WAVEHDR();
hdr.dwBufferLength=buffersize;
hdr.lpData=this.gchs[i].AddrOfPinnedObject();
hdr.dwUser=i;
this.m_hs[i]=hdr;
}
CheckError(waveOutOpen(ref m_out,m_outdex,ref m_fmt,m_outcb,0,0x00030000));
}
public WaveOut(int index, WAVEFORMATEX format, int buffersize, int buffer_count) //波形输出
{
this.m_fmt = format;
this.m_outdex = index;
m_buffersize = buffersize;
m_outcb = new waveProc(this.waveOutProc);
Debug.Assert(buffer_count > 0 && buffer_count < 65535);
this.m_hs = new WAVEHDR[buffer_count];
this.gchs = new GCHandle[buffer_count];
for (int i = 0; i < buffer_count; i++)
{
gchs[i] = GCHandle.Alloc(new byte[buffersize], GCHandleType.Pinned);
WAVEHDR hdr = new WAVEHDR();
hdr.dwBufferLength = buffersize;
hdr.lpData = this.gchs[i].AddrOfPinnedObject();
hdr.dwUser = i;
this.m_hs[i] = hdr;
}
CheckError(waveOutOpen(ref m_out, m_outdex, ref m_fmt, m_outcb, 0, 0x00030000));
}
public WaveIn(int index,WAVEFORMATEX format,int buffersize,int buffer_count)
{
this.m_fmt=format;
this.m_index=index;
m_incb=new waveProc(this.waveInProc);
Debug.Assert(buffer_count>0 && buffer_count<65535);
this.m_hs=new WAVEHDR[buffer_count];
this.gchs=new GCHandle[buffer_count];
// this.datas=new IntPtr[buffer_count];
for(int i=0;i<buffer_count;i++)
{
gchs[i]=GCHandle.Alloc(new byte[buffersize],GCHandleType.Pinned);
// this.datas[i]=Marshal.AllocCoTaskMem(buffer_count);
WAVEHDR hdr=new WAVEHDR();
hdr.dwBufferLength=buffersize;
hdr.lpData=this.gchs[i].AddrOfPinnedObject();
hdr.dwUser=i;
this.m_hs[i]=hdr;
}
CheckError(waveInOpen(ref m_in,m_index,ref m_fmt,m_incb,0,0x00030000));
CheckError(waveInStart(m_in));
}
public WaveIn(int index, WAVEFORMATEX format, int buffersize, int buffer_count)
{
this.m_fmt = format;
this.m_index = index;
m_incb = new waveProc(this.waveInProc);
Debug.Assert(buffer_count > 0 && buffer_count < 65535);
this.m_hs = new WAVEHDR[buffer_count];
this.gchs = new GCHandle[buffer_count];
// this.datas=new IntPtr[buffer_count];
for (int i = 0; i < buffer_count; i++)
{
gchs[i] = GCHandle.Alloc(new byte[buffersize], GCHandleType.Pinned);
// this.datas[i]=Marshal.AllocCoTaskMem(buffer_count);
WAVEHDR hdr = new WAVEHDR();
hdr.dwBufferLength = buffersize;
hdr.lpData = this.gchs[i].AddrOfPinnedObject();
hdr.dwUser = i;
this.m_hs[i] = hdr;
}
CheckError(waveInOpen(ref m_in, m_index, ref m_fmt, m_incb, 0, 0x00030000));
CheckError(waveInStart(m_in));
}
/////////////////////////////////////////////////////////////////////////
// PassWave
//
// 滤波算法
//
// 参数：Format —— 波形音频格式结构WAVEFORMATEX
// lpData —— 波形音频数据块指针
// dwDataLength —— 波形音频数据块大小
// fFrequencyPass —— 滤波频率阈值
// fParam0, fParam1, fParam2 —— 滤波参数
//
// 无返回值
/////////////////////////////////////////////////////////////////////////
unsafe private static void PassWave(WAVEFORMATEX Format, byte *lpData,
int dwDataLength, float fFrequencyPass,
float fParam0, float fParam1, float fParam2)
{
float fXL0, fXL1, fYL1, fYL0;
float fXR0, fXR1, fYR1, fYR0;
int i;
switch (Format.wBitsPerSample)
{
case 8:
switch (Format.nChannels)
{
case 1:
fXL0 = (float)*(byte *)lpData;
fXL1 = fXL0;
fYL1 = fXL0;
for (i = 0; i < dwDataLength; i += sizeof(byte))
{
fXL0 = (float)*(byte *)(lpData + i);
fYL0 = fParam0 * fXL0 + fParam1 * fXL1 -
fParam2 * fYL1;
*(byte *)(lpData + i) = (byte)fYL0;
fXL1 = fXL0;
fYL1 = fYL0;
}
break;
case 2:
fXL0 = (float)*(byte *)lpData;
fXL1 = fXL0;
fYL1 = fXL0;
fXR0 = (float)*(byte *)(lpData + sizeof(byte));
fXR1 = fXR0;
fYR1 = fXR0;
for (i = 0; i < dwDataLength; i += 2 * sizeof(byte))
{
fXL0 = (float)*(byte *)(lpData + i);
fYL0 = fParam0 * fXL0 + fParam1 * fXL1 -
fParam2 * fYL1;
*(byte *)(lpData + i) = (byte)fYL0;
fXL1 = fXL0;
fYL1 = fYL0;
fXR0 = (float)*(byte *)(lpData + i + sizeof(byte));
fYR0 = fParam0 * fXR0 + fParam1 * fXR1 -
fParam2 * fYR1;
*(byte *)(lpData + i + sizeof(byte)) = (byte)fYR0;
fXR1 = fXR0;
fYR1 = fYR0;
}
break;
}
break;
case 16:
switch (Format.nChannels)
{
case 1:
fXL0 = (float)*(short *)lpData;
fXL1 = fXL0;
fYL1 = fXL0;
for (i = 0; i < dwDataLength; i += 2)
{
fXL0 = (float)*(short *)(lpData + i);
fYL0 = fParam0 * fXL0 + fParam1 * fXL1 -
fParam2 * fYL1;
*(short *)(lpData + i) = (short)fYL0;
fXL1 = fXL0;
fYL1 = fYL0;
}
break;
case 2:
fXL0 = (float)*(short *)lpData;
fXL1 = fXL0;
fYL1 = fXL0;
fXR0 = (float)*(short *)(lpData + sizeof(short));
fXR1 = fXR0;
fYR1 = fXR0;
for (i = 0; i < dwDataLength; i += 2 * sizeof(short))
{
fXL0 = (float)*(short *)(lpData + i);
fYL0 = fParam0 * fXL0 + fParam1 * fXL1 -
fParam2 * fYL1;
*(short *)(lpData + i) = (short)fYL0;
fXL1 = fXL0;
fYL1 = fYL0;
fXR0 = (float)*(short *)(lpData +
i + sizeof(short));
fYR0 = fParam0 * fXR0 + fParam1 * fXR1 -
fParam2 * fYR1;
*(short *)(lpData + i + sizeof(short)) =
(short)fYR0;
fXR1 = fXR0;
fYR1 = fYR0;
}
break;
}
break;
}
}
private extern static int waveOutOpen(ref IntPtr phwo,int uDeviceID, ref WAVEFORMATEX pwfx, waveProc dwCallback,int dwInstance, int fdwOpen);
/////////////////////////////////////////////////////////////////////////
// PassWave
//
// 滤波算法
//
// 参数：Format —— 波形音频格式结构WAVEFORMATEX
// lpData —— 波形音频数据块指针
// dwDataLength —— 波形音频数据块大小
// fFrequencyPass —— 滤波频率阈值
// fParam0, fParam1, fParam2 —— 滤波参数
//
// 无返回值
/////////////////////////////////////////////////////////////////////////
unsafe private static void PassWave(WAVEFORMATEX Format, byte* lpData,
int dwDataLength, float fFrequencyPass,
float fParam0,float fParam1, float fParam2)
{
float fXL0,fXL1,fYL1,fYL0;
float fXR0,fXR1,fYR1,fYR0;
int i;
switch(Format.wBitsPerSample)
{
case 8:
switch(Format.nChannels)
{
case 1:
fXL0=(float)*(byte *)lpData;
fXL1=fXL0;
fYL1=fXL0;
for(i=0;i<dwDataLength;i+=sizeof(byte))
{
fXL0=(float)*(byte *)(lpData+i);
fYL0=fParam0*fXL0+fParam1*fXL1-
fParam2*fYL1;
*(byte *)(lpData+i)=(byte)fYL0;
fXL1=fXL0;
fYL1=fYL0;
}
break;
case 2:
fXL0=(float)*(byte *)lpData;
fXL1=fXL0;
fYL1=fXL0;
fXR0=(float)*(byte *)(lpData+sizeof(byte));
fXR1=fXR0;
fYR1=fXR0;
for(i=0;i<dwDataLength;i+=2*sizeof(byte))
{
fXL0=(float)*(byte *)(lpData+i);
fYL0=fParam0*fXL0+fParam1*fXL1-
fParam2*fYL1;
*(byte *)(lpData+i)=(byte)fYL0;
fXL1=fXL0;
fYL1=fYL0;
fXR0=(float)*(byte *)(lpData+i+sizeof(byte));
fYR0=fParam0*fXR0+fParam1*fXR1-
fParam2*fYR1;
*(byte *)(lpData+i+sizeof(byte))=(byte)fYR0;
fXR1=fXR0;
fYR1=fYR0;
}
break;
}
break;
case 16:
switch(Format.nChannels)
{
case 1:
fXL0=(float)*(short *)lpData;
fXL1=fXL0;
fYL1=fXL0;
for(i=0;i<dwDataLength;i+=2)
{
fXL0=(float)*(short *)(lpData+i);
fYL0=fParam0*fXL0+fParam1*fXL1-
fParam2*fYL1;
*(short *)(lpData+i)=(short)fYL0;
fXL1=fXL0;
fYL1=fYL0;
}
break;
case 2:
fXL0=(float)*(short *)lpData;
fXL1=fXL0;
fYL1=fXL0;
fXR0=(float)*(short *)(lpData+sizeof(short));
fXR1=fXR0;
fYR1=fXR0;
for(i=0;i<dwDataLength;i+=2*sizeof(short))
{
fXL0=(float)*(short *)(lpData+i);
fYL0=fParam0*fXL0+fParam1*fXL1-
fParam2*fYL1;
*(short *)(lpData+i)=(short)fYL0;
fXL1=fXL0;
fYL1=fYL0;
fXR0=(float)*(short *)(lpData+
i+sizeof(short));
fYR0=fParam0*fXR0+fParam1*fXR1-
fParam2*fYR1;
*(short *)(lpData+i+sizeof(short))=
(short)fYR0;
fXR1=fXR0;
fYR1=fYR0;
}
break;
}
break;
}
}
private extern static int waveOutOpen(ref IntPtr phwo, int uDeviceID,
ref WAVEFORMATEX pwfx, waveProc dwCallback, int dwInstance, int fdwOpen);