IAMCertifiedOutputProtection::SessionSequenceStart method (strmif.h)
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The SessionSequenceStart method initiates the COPP session with the graphics driver.
Syntax
HRESULT SessionSequenceStart(
[in] AMCOPPSignature *pSig
);
Parameters
[in] pSig
Pointer to an AMCOPPSignature structure. Fill this structure as described in the Remarks session.
Return value
Returns an HRESULT value. Possible values include the following.
| Return code | Description |
|---|---|
|
Success. |
|
Invalid state. Possibly the application passed unexpected data, or called IAMCertifiedOutputProtection methods in the wrong order. |
|
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.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows XP with SP2 [desktop apps only] |
| Minimum supported server | Windows Server 2003 R2 [desktop apps only] |
| Target Platform | Windows |
| Header | strmif.h (include Dshow.h) |
| Library | Strmiids.lib |