[Freeswitch-users] Freeswitch stereo question(s)

Fri Jun 26 05:27:45 MSD 2015

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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.freeswitch.org/pipermail/freeswitch-users/attachments/20150625/b519714c/attachment-0001.html 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: emoji_u260e.png
Type: image/png
Size: 3053 bytes
Desc: not available
Url : http://lists.freeswitch.org/pipermail/freeswitch-users/attachments/20150625/b519714c/attachment-0001.png 