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// Set the input wave format
//
WAVEFORMATEX waveFormat;
waveFormat.wFormatTag = WAVE_FORMAT_PCM;
waveFormat.nChannels = 2; // mono <=> 1, stereo <=> 2
waveFormat.nSamplesPerSec = 44100;
waveFormat.wBitsPerSample = 16; // 你这个参数好像填的不正确
waveFormat.nBlockAlign = waveFormat.nChannels * (waveFormat.wBitsPerSample/8);
waveFormat.nAvgBytesPerSec = waveFormat.nSamplesPerSec * waveFormat.nBlockAlign;
waveFormat.cbSize = 0;
https://msdn.microsoft.com/zh-HK/library/ms713735