[asterisk-dev] Configuring multistream in chan_pjsip

[Matt Fredrickson]

On Mon, Jun 5, 2017 at 2:31 PM, Joshua Colp <jcolp at digium.com> wrote:
> On Mon, Jun 5, 2017, at 04:21 PM, Mark Michelson wrote:
>> Hi folks,
>>
>> For those of you following along at home, I recently published review
>> https://gerrit.asterisk.org/#/c/5760/ , which is step one towards making
>> chan_pjsip multistream, i.e. supporting more than one stream of a given
>> media type. This initial review does not actually introduce multistream
>> support so much as it just makes use of multistream structures under the
>> hood to ease the transition.
>>
>> Continuing on, one of the next steps we need to determine is how a user
>> of chan_pjsip should configure a channel that supports multiple streams
>> of a particular type.
>>
>> To refresh everyone on how things currently work in pjsip.conf, you set
>> an "allow" option in order to determine what codecs a particular
>> endpoint supports.
>>
>> [Alice]
>> type = endpoint
>> allow = ulaw,opus,h264
>>
>
> <snip>
>
>>
>> I propose the following configuration options to move forward.
>>
>> offered_audio_streams = 1
>> offered_video_streams = 2
>
> <snip>
>
> My only question is why, in a scenario where we don't have a hint, would
> we want to make the number of offered streams configurable by the user?
> Ultimately it's up to the application that is handling the channel to
> decide what it wants and that is decided in the moment, not ahead of
> time based on configuration.
>
> I think maximum and minimum are useful for enforcing some constraints
> though.

That echoes my thoughts as well.  +1 to not having the
"offered_audio/video_streams" options, but I'm ok with the limiting of
maximum stream count for now.

-- 
Matthew Fredrickson
Digium, Inc. | Engineering Manager
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA