wince下wave驱动的调用过程

近日为了解决telechips的wince平台下百度carlife语音识别时，出现wavedev.dll报错的问题。花了两天的时间来阅读wavedev的驱动源码。得到了其调用的过程。比如app在调用waveoutOpen、waveoutWrite等函数时，驱动的执行路径如下：

1、waveOutOpen,waveOutWrite--->WAV_IOControl(IOCTL_WAV_MESSAGE)--->HandleWaveMessage.switch (WODM_WRITE,WODM_OPEN) --->StreamContext.QueueBuffer---> OutputDeviceContext::StreamReadyToRender--->HardwareContext::StartOutputDMAByTransferType--->HardwareContext::TransferOutputBuffer(DWORD dwDCSR, DWORD TransferType)---->HardwareContext::TransferOutputBuffer(ULONG NumBuf, DWORD TransferType)--->DeviceContext::TransferBuffer---->WaveStreamContext::Render---->OutputStreamContextNonPCM::Render2

2、硬件驱动层播放完pcm数据后，会产生中断，下面是中断调用过程：

HardwareContext::InterruptThread()--->HardwareContext::TransferOutputBuffer(DWORD dwDCSR, DWORD TransferType)---->HardwareContext::TransferOutputBuffer(ULONG NumBuf, DWORD TransferType)--->DeviceContext::TransferBuffer---->WaveStreamContext::Render---->OutputStreamContextNonPCM::Render2