MMIOM_CODEC_OPEN - Description

This message requests a CODEC procedure instance be opened. On completion, it returns a CODEC handle in phCODEC.

phCODEC (PHCODEC)

Pointer to CODEC handle.

usMsg (USHORT)

Set to MMIOM_CODEC_OPEN.

lParam1 (LONG)

Pointer to an CODECOPEN structure.

lParam2 (LONG)

This parameter is not used.

rc (ULONG)

Return codes indicating success or failure:

MMIO_SUCCESS

The specified instance is opened successfully.
MMIO_ERROR
An error code is returned.

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