[Bug 19616] New: session id for encrypted media

https://www.w3.org/Bugs/Public/show_bug.cgi?id=19616

          Priority: P2
            Bug ID: 19616
                CC: mike@w3.org, public-html-media@w3.org
          Assignee: adrianba@microsoft.com
           Summary: session id for encrypted media
        QA Contact: public-html-bugzilla@w3.org
          Severity: normal
    Classification: Unclassified
                OS: Windows NT
          Reporter: eric.sun@huawei.com
          Hardware: PC
            Status: NEW
           Version: unspecified
         Component: Encrypted Media Extensions
           Product: HTML WG

question: why session ids nee not necessarily be supporte by content protection
client? the client is CDM?

////////////First Change///////////////////////////////////////////////////////
1.2.3. Session ID

A session ID is an optional string ID used to associate calls related to a
key/license lifetime, starting with the request. It is a local binding between
a request and key/license. It does not associate keys or licenses for different
streams (i.e. audio and video). If supported by the Key System, it is generated
by the user agent/CDM and provided to the application in the keymessage event.
(Session IDs need not necessarily be supported by the underlying content
protection client or server.)

////Each successful call to createSession() generates a new Session
ID.-deleted////

Applications should always provide the session ID from an event in subsequent
calls for this key or license. (This is a best practice, even if the current
Key System does not support session IDs.) This may mean that the application
must associate a server response with the session ID and provide them both to
addKey().

If Session IDs are supported, a new one will be created each time
createSession() is ////successfully/// called. The user agent/CDM manage the
lifetime of Session IDs. All Session IDs are cleared from the media element
when a load occurs, although the CDM may retain them for longer.
/////////////First Change 
end//////////////////////////////////////////////////

session id can be generated by cdm or user agent, and it is "only" used by 1
MediaKeySession object but not objects.
/////////////second change////////////////////////////////////////////////

The sessionId attribute is the Session ID for this ////objects->"ojbect"////
and the associated key(s) or license(s)

Let the sessionId attribute be a unique Session ID string. It may be generated
by cdm //// or user agent/////

/////////// second change end///////////////////////////////////////////////

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