WAV_IOControl Messages and Parameter Structures

  • Article

The Unified Audio Model (UAM) has new I/O control code (IOCTL) values and message parameters. These have been added to support the DirectSound and hardware mixer middleware extensions to the wave audio streaming driver model.

The following are the new WAV_IOControl values and messages.

  • DirectSound

    dwcode = IOCTL_DSDVR_MESSAGE

    pBufIn = pointer to DSDVR_MESSAGE_PARAMS

    dwLenIn = sizeof(DSDVR_MESSAGE_PARAMS)

    The remaining WAV_IOControl parameters are the same as those found in IOCTL_WAV_MESSAGE in previous versions of the operating system (OS).

  • Hardware Mixer

    dwcode = IOCTL_MIX_MESSAGE

    pBufIn = pointer to MMDRV_MESSAGE_PARAMS

    dwLenIn = sizeof(MMDRV_MESSAGE_PARAMS)

    The remaining WAV_IOControl parameters are the same as those found in IOCTL_WAV_MESSAGE in the previous versions of the OS.

The new messages and their related structures are specified in DirectSound Driver Messages, Audio Mixer Messages, and DirectSound Driver Structures.

See Also

Unified Audio Model

 Last updated on Tuesday, May 18, 2004

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