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Re: [rtcweb] Rate for telephone-events in combination with OPUS

Justin Uberti <juberti@google.com> Thu, 17 July 2014 15:02 UTC

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From: Justin Uberti <juberti@google.com>
Date: Thu, 17 Jul 2014 11:02:24 -0400
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To: Roman Shpount <roman@telurix.com>
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Subject: Re: [rtcweb] Rate for telephone-events in combination with OPUS
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For Chrome, we just haven't gotten to it yet. I think there is an open bug
on it.


On Wed, Jul 16, 2014 at 11:48 PM, Roman Shpount <roman@telurix.com> wrote:

> So, I guess the fact that neither Chrome no Firefox do this is an
> oversight or an unimplemented feature.
>  On Jul 16, 2014 11:14 PM, "Justin Uberti" <juberti@google.com> wrote:
>
>> Yes, this is my understanding as well.
>>
>>
>> On Wed, Jul 16, 2014 at 2:45 PM, Roman Shpount <roman@telurix.com> wrote:
>>
>>> Should we specify two telephone-events payloads, one with 8000 rate to
>>> be used with PCMU/PCMA and another with 48000 rate to be used with OPUS?
>>>
>>> From what I can see, based on RFC 7160, if OPUS codec is used
>>> telephone-events should either be transmitted with the rate 48Khz or use a
>>> different SSRC. On the other hand if PCMU/PCMA is selected then DTMF should
>>> be transmitted using 8000 clock or use a different SSRC. Using different
>>> SSRC is problematic since it will create synchronization issues with audio
>>> playback (things like record your name and press pound will stop working)
>>> apart from other webrtc related issues. I think the only solution that
>>> makes sense is to advertise two telephone-events payloads and use the
>>> appropriate one based on the selected transmit codec, similar to CN.
>>> _____________
>>> Roman Shpount
>>>
>>> _______________________________________________
>>> rtcweb mailing list
>>> rtcweb@ietf.org
>>> https://www.ietf.org/mailman/listinfo/rtcweb
>>>
>>>
>>

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