IAMCertifiedOutputProtection::SessionSequenceStart
| Microsoft DirectShow 9.0 |
IAMCertifiedOutputProtection::SessionSequenceStart
This topic applies only to Windows XP Service Pack 2 or later.
The SessionSequenceStart method initiates the COPP session with the graphics driver.
Syntax
HRESULT SessionSequenceStart(
AMCOPPSignature *pSig
);
Parameters
pSig
[in] Pointer to an AMCOPPSignature structure. Fill this structure as described in the Remarks session.
Return Values
Returns an HRESULT value. Possible values include the following.
| Return Code | Description |
| S_OK | Success. |
| E_UNEXPECTED | Invalid state. Possibly the application passed unexpected data, or called IAMCertifiedOutputProtection methods in the wrong order. |
| VFW_E_NO_COPP_HW | The display device does not support COPP; or the VMR has not connected to a display device yet. |
Remarks
To fill in the structure for the pSig parameter, first concatenate the following numbers:
- The 128-bit number returned in the pRandom parameter of the IAMCertifiedOutputProtection::KeyExchange method.
- Data integrity session key. This value is a 128-bit random number generated by the application.
- Starting sequence number for COPP status requests. This value is a 32-bit random number generated by the application.
- Starting sequence number for COPP commands. This value is a 32-bit random number generated by the application.
Then encrypt this number with 2048-bit RSA encryption using the graphics driver's public encryption key. The public encryption key is contained in the certificate returned in the VarLenCertGH parameter of the KeyExchange method.
Requirements
Header: Declared in Strmif.h; include Dshow.h.
Library: Use Strmiids.lib.
See Also