> After doing some testing with openRTSP and looking through the code it
> appears like "Absolute Time" is currently not supported for RTSP streams.
> I.e. I can't specify a specific time that the stream should seek to, e.g.
> Range: clock=20120629T070000.00Z, all according to paragraph 3.7 at
> http://www.ietf.org/rfc/rfc2326.txt.
FYI, the latest version (2012.08.20) of the "LIVE555 Streaming Media" code adds
optional RTSP server and RTSP client support for streams that are indexed by
'absolute' time - i.e., using strings of the form "YYYYMMDDTHHMMSSZ" or
"YYYYMMDDTHHMMSS.<frac>Z".
For RTSP server developers (i.e., developers who have their own subclasses of
"OnDemandServerMediaSubsession"):
- To automatically have your streams advertised (in their SDP description)
as supporting absolute time indexing, reimplement (in your subclass) the
virtual function:
"virtual void getAbsoluteTimeRange(char*& absStartTime, char*&
absEndTime) const;"
(see "liveMedia/include/ServerMediaSession.hh").
This function should set "absStartTime" to a string value (of the form
noted above), and should set "absEndTime" to a corresponding string value, if
the stream has an end time, otherwise NULL.
- To implement seeking by absolute time, reimplement (in your subclass) the
virtual function:
"virtual void seekStreamSource(FramedSource* inputSource, char*&
absStart, char*& absEnd);"
(see "liveMedia/include/OnDemandServerMediaSubsession.hh").
"absStart" (and "absEnd", if non-NULL) are strings (of the form noted
above). (The function *may* change them, to make them more accurate.)
For RTSP client developers:
- To check whether a stream supports indexing by absolute time, call
"MediaSession::absStartTime()" or "MediaSubsession::absStartTime()", and check
whether this (string) value is non-NULL.
- To play a stream, indexed by absolute time, call one of the new,
alternative forms of "RTSPClient::sendPlayCommand()" that take "absStartTime"
(and optional "absEndTime") strings as parameters.
(see "liveMedia/include/RTSPClient.hh")
Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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