[Freeswitch-users] Freeswitch stereo question(s)

Fri Jun 26 08:38:23 MSD 2015

Thanks Anthony

On Friday, June 26, 2015, Anthony Minessale <anthony.minessale at gmail.com>
wrote:

> Yes
>
> On Thursday, June 25, 2015, Chris Mandra <mandra at gmail.com
> <javascript:_e(%7B%7D,'cvml','mandra at gmail.com');>> wrote:
>
>> If the moh in a conf is stereo then the conf is stereo, right?
>>
>> On Thursday, June 25, 2015, Anthony Minessale <
>> anthony.minessale at gmail.com> wrote:
>>
>>> FreeSWITCH will not do mono one direction and stereo another.  For
>>> simplicity sake forget the distinction of stereo where the channels are
>>> separate and mono duped into stereo.  If the chrome asks for stereo, fs
>>> will do interleaved stereo both ways.   Chrome will send from a stereo mic
>>> if echo can is off or it will double the mono signal to stereo.
>>>
>>> If you call the conference with mono and conference is set to 2 channels
>>> it will convert it accoringly.
>>>
>>> If you are tapping the write stream and its not stereo interleaved
>>> audio, then the channel is not operating in stereo mode.  You can tell by
>>> playing an obvious stereo file in the conference and listen with stereo
>>> headphones.
>>>
>>>
>>>
>>> On Thursday, June 25, 2015, Chris Mandra <mandra at gmail.com> wrote:
>>>
>>>> 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> 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
>>>>>>>>>>> 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>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> _________________________________________________________________________
>>>>>>>>>> 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
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> 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
>>>>
>>>
>>>
>>> --
>>> 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  ☎ +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
>>
>
>
> --
> 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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