[Freeswitch-users] Freeswitch stereo question(s)

Fri Jun 26 08:35:36 MSD 2015

Yes

On Thursday, June 25, 2015, Chris Mandra <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
> <javascript:_e(%7B%7D,'cvml','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  ☎ +19193869900

https://www.youtube.com/watch?v=9XXgW34t40s
https://www.youtube.com/watch?v=NLaDpGQuZDA
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