[Freeswitch-users] Freeswitch stereo question(s)

[Chris Mandra]

Thanks Anthony. Question: what if in the web RTC client SDP you have it set
so that you are sending mono and receiving stereo. What happens then? Does
the core allow for that kind of asymmetry? It must, right, because, for
instance, I was sending a mono stream (or perhaps dual mono) and hearing
stereo in the conference on Friday.
Thanks, chris

On Tuesday, June 23, 2015, Anthony Minessale <anthony.minessale at gmail.com>
wrote:

> If you call in and negotiate stereo, it uses stereo, if you try to play a
> mono audio stream it will resample and or mux it appropriately.
> If you call in with mono to mod_conference in stereo mode it will
> up-sample the input and the core will down-sample the output.
>
> If you are not using our verto demo with the stereo checked and calling
> with opus, there are not many other ways to turn stereo on.
>
>
>
> On Tue, Jun 23, 2015 at 5:46 PM, Chris Mandra <mandra at gmail.com
> <javascript:_e(%7B%7D,'cvml','mandra at gmail.com');>> wrote:
>
>> Hi Anthony - thanks for the info.
>> So, "channels" is already set to 2 in
>> conf/autoload_configs/conference.conf.xml
>>
>>  <profile name="video-mcu-stereo">
>>
>>       <param name="domain" value="$${domain}"/>
>>
>>       <param name="rate" value="48000"/>
>>
>>       <param name="channels" value="2"/>
>>
>>       <param name="interval" value="20"/>
>>
>>       <param name="energy-level" value="200"/>
>>
>>
>> Does freeswitch test for actual stereo (as opposed to two channel mono)
>> and if it sees 2 chan mono does it downsample to mono?
>>
>> thanks!
>>
>> chris
>>
>> On Tue, Jun 23, 2015 at 6:26 PM, Anthony Minessale <
>> anthony.minessale at gmail.com
>> <javascript:_e(%7B%7D,'cvml','anthony.minessale at gmail.com');>> wrote:
>>
>>> Yes its interleaved.
>>>
>>> If you are calling into a conference you will have to run the conference
>>> in stereo or the channel will be downsampled to mono to match.
>>> Set channels to 2 in the mod_conference profile.
>>>
>>>
>>>
>>>
>>> On Tue, Jun 23, 2015 at 5:21 PM, Chris Mandra <mandra at gmail.com
>>> <javascript:_e(%7B%7D,'cvml','mandra at gmail.com');>> wrote:
>>>
>>>> Hi guys, I have another question about freeswitch, conferences and
>>>> stereo.
>>>>
>>>> When I make a webrtc call into 3500 on my freeswitch server, mod_ladspa
>>>> is reporting the number of samples as 1920 (20 ms stereo interleaved I
>>>> assume) fine for a few seconds, and then the number of samples drops to 960
>>>> (20 ms mono) Any idea why this might be happening?
>>>>
>>>> Also, I have been assuming that stereo in freeswitch is interleaved -
>>>> is that the case? Is that assumption incorrect? If not interleaved, how
>>>> does fs handle stereo.
>>>>
>>>>
>>>> thanks!
>>>> chris
>>>>
>>>>
>>>>
>>>> _________________________________________________________________________
>>>> Professional FreeSWITCH Consulting Services:
>>>> consulting at freeswitch.org
>>>> <javascript:_e(%7B%7D,'cvml','consulting at freeswitch.org');>
>>>> http://www.freeswitchsolutions.com
>>>>
>>>> Official FreeSWITCH Sites
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>>>> http://www.cluecon.com
>>>>
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>>>
>>>
>>>
>>> --
>>> Anthony Minessale II       ♬ @anthmfs  ♬ @FreeSWITCH  ♬
>>>
>>> ☞ http://freeswitch.org/  ☞ http://cluecon.com/  ☞
>>> http://twitter.com/FreeSWITCH
>>> ☞ irc.freenode.net #freeswitch ☞ *http://freeswitch.org/g+
>>> <http://freeswitch.org/g+>*
>>>
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>>>
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>>>
>>> _________________________________________________________________________
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>>> <javascript:_e(%7B%7D,'cvml','consulting at freeswitch.org');>
>>> http://www.freeswitchsolutions.com
>>>
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>>> http://www.cluecon.com
>>>
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>>
>>
>>
>> --
>> mandra
>> c:410.258.5281
>>
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services:
>> consulting at freeswitch.org
>> <javascript:_e(%7B%7D,'cvml','consulting at freeswitch.org');>
>> http://www.freeswitchsolutions.com
>>
>> Official FreeSWITCH Sites
>> http://www.freeswitch.org
>> http://confluence.freeswitch.org
>> http://www.cluecon.com
>>
>> FreeSWITCH-users mailing list
>> FreeSWITCH-users at lists.freeswitch.org
>> <javascript:_e(%7B%7D,'cvml','FreeSWITCH-users at lists.freeswitch.org');>
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>>
>
>
>
> --
> Anthony Minessale II       ♬ @anthmfs  ♬ @FreeSWITCH  ♬
>
> ☞ http://freeswitch.org/  ☞ http://cluecon.com/  ☞
> http://twitter.com/FreeSWITCH
> ☞ irc.freenode.net #freeswitch ☞ *http://freeswitch.org/g+
> <http://freeswitch.org/g+>*
>
> ClueCon Weekly Development Call
> ☎ sip:888 at conference.freeswitch.org
> <javascript:_e(%7B%7D,'cvml','sip:888 at conference.freeswitch.org');>  ☎
> +19193869900
>
> ClueCon Testimonials <https://www.youtube.com/watch?v=9XXgW34t40s>
> ClueCon This Summer <https://www.youtube.com/watch?v=NLaDpGQuZDA>
>


-- 
mandra
c:410.258.5281
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