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[Bug 27213] DTMFSender should hang off RTCRTPSender, not MediaStreamTrack

From: <bugzilla@jessica.w3.org>
Date: Tue, 04 Nov 2014 18:16:51 +0000
To: public-webrtc@w3.org
Message-ID: <bug-27213-4991-kWP8KLze3B@http.www.w3.org/Bugs/Public/>

Harald Alvestrand <harald@alvestrand.no> changed:

           What    |Removed                     |Added
         Depends on|                            |25497

--- Comment #1 from Harald Alvestrand <harald@alvestrand.no> ---
>From Peter Thatcher:

At TPAC 2014, we realized that now that we have RtpSender, we don't need a
DTMFSender to be tied to a track.  We can tie it to an RtpSender instead, and
that would clean things up a fair bit.

Based on that, I propose we: 

1. Remove RTCPeerConnection.createDTMFSender
2. Add RTCRtpSender.dtmf, of type "RTCDTMFSender?".
3. Remove RTCDTMFSender.canInsertDTMF and RTCDTMFSender.track.

The rule is: If RtpSender.dtmf is non-null, you can send DTMF.  Here is an

var pc = ...;
var track = ...;
var rtpSender = pc.addTrack(track);
if (rtpSender.dtmf) {

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