static byte[][] pBufferOut = new byte[2][]; // 用于录音的两块缓冲区
public void initWave()
{
// 初始化waveform
waveform.wFormatTag = WAVE_FORMAT_PCM; // 采样方式,PCM(脉冲编码调制)
waveform.nChannels = 1; // 单声道
waveform.nSamplesPerSec = 8000; // 采样率 8KHz
waveform.nAvgBytesPerSec = 8000; // 数据率 8KB/s
waveform.nBlockAlign = 1; // 最小块单元，wBitsPerSample×nChannels/8
waveform.wBitsPerSample = 8; // 样本大小为8bit
waveform.cbSize = 0; // 附加格式信息
for (int HdrNum = 0; HdrNum < 2; HdrNum++)
{
// 为缓冲区分配内存
pBufferIn[HdrNum] = new byte[INP_BUFFER_SIZE * 2]; // 播放缓冲区
pBufferOut[HdrNum] = new byte[INP_BUFFER_SIZE]; // 录音缓冲区
pWaveHdrIn[HdrNum] = new waveStruct.wavehdr_tag(); // 录音设备结构
pWaveHdrOut[HdrNum] = new waveStruct.wavehdr_tag(); // 播放设备结构
pWaveHdrOut[HdrNum].lpData = pBufferOut[HdrNum];
pWaveHdrOut[HdrNum].dwBufferLength = INP_BUFFER_SIZE * 2;
pWaveHdrOut[HdrNum].dwBytesRecorded = 0;
pWaveHdrOut[HdrNum].dwUser = 0;
pWaveHdrOut[HdrNum].dwFlags = WHDR_BEGINLOOP | WHDR_ENDLOOP;
pWaveHdrOut[HdrNum].dwLoops = 1;
pWaveHdrOut[HdrNum].lpNext = IntPtr.Zero;
pWaveHdrOut[HdrNum].reserved = 0;
pWaveHdrIn[HdrNum].lpData = pBufferOut[HdrNum];
pWaveHdrIn[HdrNum].dwBufferLength = INP_BUFFER_SIZE;
pWaveHdrIn[HdrNum].dwBytesRecorded = 0;
pWaveHdrIn[HdrNum].dwUser = 0;
pWaveHdrIn[HdrNum].dwFlags = WHDR_BEGINLOOP | WHDR_ENDLOOP;
pWaveHdrIn[HdrNum].dwLoops = 1;
pWaveHdrIn[HdrNum].lpNext = IntPtr.Zero;
pWaveHdrIn[HdrNum].reserved = 0;
}
int result = 0;
// 打开播放波形音频设备
result = WaveAPI.waveOutOpen(hWaveOut, WAVE_MAPPER, ref waveform, 0, 0, CALLBACK_WINDOW);
// 打开录制波形音频设备
if (result == 0)
{
result = WaveAPI.waveInOpen(hWaveIn, WAVE_MAPPER, ref waveform, 0, 0, CALLBACK_WINDOW);
}
}
public static extern int waveOutPrepareHeader(IntPtr hwave, ref waveStruct.wavehdr_tag wavehdr, int usize);
