VSDEntry - Parameters

hvsd (HVSD) - input

This parameter is the handle to the VSD instance.

ulFunc (ULONG) - input

The VSD command to be issued. The following commands are supported for audio VSDs.

┌──────────────────────────────┬──────────────────────────────┐│Command                       │Description                   │
├──────────────────────────────┼──────────────────────────────┤
│VSD_CLOSE                     │Closes the device. (Required) │
├──────────────────────────────┼──────────────────────────────┤
│VSD_DDCMD                     │Allows communication between  │
│                              │stream handlers and their     │
│                              │attached devices. (Required)  │
├──────────────────────────────┼──────────────────────────────┤
│VSD_ESCAPE                    │Sends a buffer to the device. │
│                              │(Optional)                    │
├──────────────────────────────┼──────────────────────────────┤
│VSD_GETDEVCAPS                │Retrieves the device          │
│                              │capabilities. (Required)      │
├──────────────────────────────┼──────────────────────────────┤
│VSD_OPEN                      │Opens an instance of the      │
│                              │device. (Required)            │
├──────────────────────────────┼──────────────────────────────┤
│VSD_QUERY                     │Queries the status of the     │
│                              │device. (Required)            │
├──────────────────────────────┼──────────────────────────────┤
│VSD_RESOURCE                  │Manages resources. (Required) │
├──────────────────────────────┼──────────────────────────────┤
│VSD_RESTORE                   │Restores device to a saved    │
│                              │state. (Required)             │
├──────────────────────────────┼──────────────────────────────┤
│VSD_SAVE                      │Saves the current state of the│
│                              │device instance. (Required)   │
├──────────────────────────────┼──────────────────────────────┤
│VSD_SET                       │Modifies settings of the      │
│                              │device. (Required)            │
├──────────────────────────────┼──────────────────────────────┤
│VSD_USER                      │Allows user-defined commands  │
│                              │to be passed into the VSD.    │
│                              │(Optional)                    │
└──────────────────────────────┴──────────────────────────────┘

ulFlags (ULONG) - input

The ulFlags parameter is used to further qualify the command specified in ulFunc. In many cases it is used as a subcommand. For more information on ulFlags, see the specific ulFunc parameter.

pRequest (PVOID) - input

Specifies the pointer to the request packet. The caller of the VSD supplies all request buffers. See individual commands for more detailed information.

rc (ULONG) - returns

The return codes are listed for each command and will vary based on the command sent.

If a VSD requires unique return codes for certain conditions, it can use return codes starting at VSDERR_BASE.

---

[Back: VSDEntry Return Value - rc]
[Next: VSDEntry - Remarks]