[Live-devel] Queries: regarding AAC

[Ross Finlayson]

>1. I am unable to find any framer class ( as was used for 
>MPEG4ESVideoStreamFramer ; as well as a corresponding parser) for 
>the same. The issue is that I am using Live555 as an RTP packetizer 
>for aac content and relaying it to Darwin which does the necessary 
>RTSP part). So I cannot just use live555 as an RTSP server.

Yes you can.  You've just chosen not to. :-)


>  I want to know that just creating an RTP sink using the 
>MPEG4GenericRTPSink ; then jusing the source 
>ADTSAudioFileSource(which works from file/encoder) and then invoking 
>startPlaying() is enough?

Yes.  See the "ADTSAudioFileServerMediaSubsession" for an illustration.


>Wouldn't I need a framer; which decides what is in an audio frame; 
>has methods like continuePlaying(); getNextFrame() etc and processes 
>it appropriately.

No, because "ADTSAudioFileSource" delivers discrete frames (and with 
correct presentation times), so you don't need a separate 'framer' 
class.


>2. In the MPEG4ESVideo Elementary streaming (relay to darwin)test 
>program , there is a hack to read configuration information from the 
>stream ; to generate an SDP description; and an announce RTSP 
>operation is done. Does the hack need to be there for MPEG4 audio as 
>well.. Similarily if I were to stream h264 video content, is this 
>hack needed?

Probably, because both of those codecs have stream-specific 
'configuration' information that needs to be added to the SDP 
description, before it gets used.

-- 

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/