// strmini.h

PVOID STREAMAPI StreamClassGetDmaBuffer(
  [in] PVOID HwDeviceExtension
);
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Windows Driver Kit DDI reference (nf-strmini-streamclassgetdmabuffer)

The StreamClassGetDmaBuffer routine returns a pointer to the DMA buffer that the class driver allocates for the minidriver.

Pointer to the minidriver's device extension. The minidriver specifies the size of this buffer in the HW_INITIALIZATION_DATA structure it passes when it registers itself via StreamClassRegisterMinidriver. The class driver then passes pointers to the buffer in the HwDeviceExtension member of the HW_STREAM_REQUEST_BLOCK, HW_STREAM_OBJECT, HW_TIME_CONTEXT, and PORT_CONFIGURATION_INFORMATION structures it passes to the minidriver.

StreamClassGetDmaBuffer returns a pointer to the DMA buffer.

The minidriver specifies the size of the DMA buffer in the DmaBufferSize member of its HW_INITIALIZATION_DATA structure.