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RE: DTMF - the "Object Oriented" approach

From: Sunyang (Eric) <eric.sun@huawei.com>
Date: Fri, 16 Nov 2012 08:17:43 +0000
To: Adam Bergkvist <adam.bergkvist@ericsson.com>, Harald Alvestrand <harald@alvestrand.no>
CC: "public-webrtc@w3.org" <public-webrtc@w3.org>
Message-ID: <9254B5E6361B1648AFC00BA447E6E8C32AED81F4@szxeml545-mbx.china.huawei.com>

Yang
Huawei


> -----Original Message-----
> From: Adam Bergkvist [mailto:adam.bergkvist@ericsson.com]
> Sent: Friday, November 16, 2012 2:33 PM
> To: Harald Alvestrand
> Cc: public-webrtc@w3.org
> Subject: Re: DTMF - the "Object Oriented" approach
> 
> On 2012-11-14 15:46, Harald Alvestrand wrote:
> > Takeaways from Lyon were that:
> >
> > - Executing DTMF needs reference to an audio track (to know where to
> > send the data) and to a PeerConnection (to know that we've successfully
> > negotiated use of the DTMF codec).
> > - The WG preferred an "object oriented" model: creating a DTMF handler
> > object, rather than the "fortran" approach of having all functions
> > directly on the PeerConnection.
> >
> > Suggested edits, delta from the October 19 version of the spec:
> >
> > - In section 8.4, rename AudioMediaStreamTrack to
> > DTMFSendingMediaStreamTrack.
> > Add the following text:
> >
> > A RTCDTMFSendingMediaStreamTrack is created by calling the
> > createDTMFSender() method on a PeerConnection. This constructs an
> object
> > that decorates a MediaStreamTrack with the functions required to send
> DTMF.
> >
> >
> > - In section 4.3.2, add the function
> >
> > RTCDTMFSendingMediaStreamTrack
> createDTMFSender(MediaStreamTrack track);
> >
> > - In section 4.3.2.2, add the paragraph
> >
> > createDTMFSender
> >
> > The createDTMFSender() creates an RTCDTMFSendingMediaStreamTrack
> that
> > references the given MediaStreamTrack. The MediaStreamTrack MUST be
> an
> > element of a MediaStream that's currently in the PC's localStreams
> > attribute; if not, throw an Illegal Argument Exception. [NOTE - get
> > correct name for exception before inserting]
> 
> The prefix (RTCDTMF) it's pretty nasty, but I guess consistency has
> precedence in this case.
> 
> Is the intention that the decorated track needs to be added back into
> the MediaStream where the original track came from?
> 

I think RTC may not needed, but DTMFMediaStreamTrack seems better, I guess the orginal intention from Harald is not adding the track back to stream but put it in the peerconnection for public reference.



> /Adam
> 
Received on Friday, 16 November 2012 08:20:02 GMT

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