数据量(字节/秒)= (采样频率(Hz)×采样位数(bit)×声道数)/ 8
mSampleRate = 44100
mChannelsPerFrame = 1
mRecordFormat.mBitsPerChannel = 16;
mRecordFormat.mBytesPerPacket = mRecordFormat.mBytesPerFrame = (mRecordFormat.mBitsPerChannel / 8) * mRecordFormat.mChannelsPerFrame;
mRecordFormat.mFramesPerPacket = 1