[Freeswitch-users] Freeswitch stereo question(s)

Fri Jun 26 08:33:44 MSD 2015

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
> <javascript:_e(%7B%7D,'cvml','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
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>>>>>>>>> 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
> <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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