DXVA_COPPCommand structure (dxva.h)

Artikel
09/01/2022

The DXVA_COPPCommand structure describes a command sent to a protected video session that is associated with a COPP DirectX VA device.

Syntax

typedef struct _DXVA_COPPCommand {
  GUID  macKDI;
  GUID  guidCommandID;
  ULONG dwSequence;
  ULONG cbSizeData;
  UCHAR CommandData[4056];
} DXVA_COPPCommand, *LPDXVA_COPPCommand;

Members

macKDI

Specifies a message authentication code (MAC) GUID for the command at CommandData. The display driver can use the MAC to verify that the transmission of the command was secure (that is, it was not tampered with in transit to the driver).

guidCommandID

Specifies the GUID that identifies the command. The following GUIDs are supported:

DXVA_COPPSetProtectionLevel

Sets the protection type and level on the physical connector associated with the COPP device.

The DXVA_COPPSetProtectionLevel GUID is defined as follows:

DEFINE_GUID(DXVA_COPPSetProtectionLevel,
    0x9bb9327c,0x4eb5,0x4727,0x9f,0x00,0xb4,0x2b,0x09,0x19,0xc0,0xda);

DXVA_COPPSetSignaling

An instruction about how to protect the signal that goes through the physical connector associated with the DirectX VA COPP device.

The DXVA_COPPSetSignaling GUID is defined as follows:

DEFINE_GUID(DXVA_COPPSetSignaling,
    0x9a631a5,0xd684,0x4c60,0x8e,0x4d,0xd3,0xbb,0xf,0xb,0xe3,0xee);

dwSequence

Specifies a sequence number. For the COPPCommand function to process the command, the value in dwSequence must match the 32-bit random starting status sequence number that was passed in the DXVA_COPPSignature structure to the COPPSequenceStart function.

cbSizeData

Specifies the size, in bytes, of the command data at CommandData.

CommandData[4056]

Specifies an array that comprises the command data.

Remarks

For a DXVA_COPPSetProtectionLevel command, the protection information is supplied in the first 16 bytes of the CommandData array (the protection type in the first 4 bytes, the protection level in the next 4 bytes, and possibly some extended information in the last 8 bytes). In the call to the COPPCommand function, the CommandData array should be cast to a pointer to a DXVA_COPPSetProtectionLevelCmdData structure, which contains protection type, protection level, and extended information members.

For a DXVA_COPPSetSignaling command, the signaling information is supplied by casting the CommandData array to a pointer to a DXVA_COPPSetSignalingCmdData structure.

Requirements

Requirement	Value
Minimum supported client	This structure applies only to Windows Server 2003 with SP1 and later, and Windows XP with SP2 and later.
Header	dxva.h (include Dxva.h)

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