[Freeswitch-users] Freeswitch stereo question(s)

[Chris Mandra]

Yeah, Chrome sums all to mono unless you kill auto echo cancellation. So,
it seems like you're telling me that if the conference is set to stereo,
there's no reason I should be seeing 960 samples / 20ms instead of 1920
samples / 20 ms. When I first connect I see 1920, and then it switches to
960 sometime after I see the execute conference command in the cli. Is
there an obvs reason why that would happen?

On Thursday, June 25, 2015, Michael Jerris <mike at jerris.com> wrote:

> We have support for stereo, we don't have support for 2 channel mono (ie
> multiple m=audio lines in sdp).  Chrome doesn't either to my knowledge.  we
> do allow receiving mono and sending stereo, we do this all day long.
>
> On Thursday, June 25, 2015, Chris Mandra <mandra at gmail.com
> <javascript:_e(%7B%7D,'cvml','mandra at gmail.com');>> wrote:
>
>> Just a followup - Does freeswitch test for stereo? Does it differentiate
>> between two channel mono and true stereo?
>> If in the web RTC client SDP it's set so that it's sending mono and
>> receiving stereo, what happens then? Does the core generally allow for that
>> kind of asymmetry? I know that chrome sends mono bc of AEC.
>> thanks,
>> chris
>>
>> On Tue, Jun 23, 2015 at 10:03 PM, Chris Mandra <mandra at gmail.com> wrote:
>>
>>> 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> 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> 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>
>>>>>> 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
>>>>>>> http://www.freeswitchsolutions.com
>>>>>>>
>>>>>>> Official FreeSWITCH Sites
>>>>>>> http://www.freeswitch.org
>>>>>>> http://confluence.freeswitch.org
>>>>>>> http://www.cluecon.com
>>>>>>>
>>>>>>> FreeSWITCH-users mailing list
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>>>>>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
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>>>>>>> http://www.freeswitch.org
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> 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
>>>>>> [image: ☎] sip:888 at conference.freeswitch.org  [image: ☎] +19193869900
>>>>>>
>>>>>>
>>>>>> ClueCon Testimonials <https://www.youtube.com/watch?v=9XXgW34t40s>
>>>>>> ClueCon This Summer <https://www.youtube.com/watch?v=NLaDpGQuZDA>
>>>>>>
>>>>>>
>>>>>> _________________________________________________________________________
>>>>>> Professional FreeSWITCH Consulting Services:
>>>>>> 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
>>>>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>>>>>> UNSUBSCRIBE:
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>>>>>> http://www.freeswitch.org
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> mandra
>>>>> c:410.258.5281
>>>>>
>>>>>
>>>>> _________________________________________________________________________
>>>>> Professional FreeSWITCH Consulting Services:
>>>>> 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
>>>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>>>>> UNSUBSCRIBE:
>>>>> http://lists.freeswitch.org/mailman/options/freeswitch-users
>>>>> http://www.freeswitch.org
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> 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
>>>> [image: ☎] sip:888 at conference.freeswitch.org  [image: ☎] +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
>>>
>>
>>
>>
>> --
>> mandra
>> c:410.258.5281
>>
>

-- 
mandra
c:410.258.5281
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