[Freeswitch-users] Record and live stream WAV to HTTP server

Tue Apr 5 21:24:28 MSD 2016

We use multiple ones to compare confidence.
They all support chunk transfer and provide a HTTP transaction similar to :
http://developer.att.com/apis/speech/docs/v3
Look at 3/ Make API Calls

On Tue, Apr 5, 2016 at 7:14 PM, Michael Jerris <mike at jerris.com> wrote:

> Unimrcp isn't going to provide the interface he's talking about.  Can I
> ask which engine this is?
>
>
> On Tuesday, April 5, 2016, Sergey Safarov <s.safarov at gmail.com> wrote:
>
>> Look at http://www.unimrcp.org/ and
>> https://wiki.freeswitch.org/wiki/Mod_unimrcp
>>
>> On Tue, Apr 5, 2016, 19:38 Vincent Gire <vincent.gire at gmail.com> wrote:
>>
>>> We are building an IVR completely driven by ASR.
>>> ASR is performed in a distant location by a HTTP service (supporting
>>> chunked transfer) and adds an incompressible latency. We would like to
>>> stream the record to the ASR service as soon as it starts to reduce the
>>> overall latency before response.
>>> Does it make sense ?
>>>
>>>
>>> On Tue, Apr 5, 2016 at 5:39 PM, Michael Jerris <mike at jerris.com> wrote:
>>>
>>>> I would stay away from mod_vlc.  Its audio portions with recording have
>>>> known issues.  We do use the rtmp streaming in mod_av heavily but thats
>>>> obviously not wav.  Can you explain a bit more why you have this
>>>> requirement?
>>>>
>>>> On Apr 5, 2016, at 5:36 AM, Vincent Gire <vincent.gire at gmail.com>
>>>> wrote:
>>>>
>>>> Ok thanks.
>>>> It looks promising !
>>>> I'll dig into mod_vlc.
>>>>
>>>> Best
>>>>
>>>> Vincent
>>>>
>>>> On Tue, Apr 5, 2016 at 10:04 AM, Sergey Safarov <s.safarov at gmail.com>
>>>> wrote:
>>>>
>>>>> Think is requred streaming feature of freeswitch.
>>>>> Look at mod_esf
>>>>> <https://freeswitch.org/confluence/display/FREESWITCH/mod_esf> and
>>>>> mod_vlc <https://wiki.freeswitch.org/wiki/Mod_vlc>
>>>>> Instruction to compile mod_vlc on provided link is to old but helpfull
>>>>> to undestand how to stream media to http server.
>>>>>
>>>>> For compiling mod_vlc please use vlc repo
>>>>> <https://freeswitch.org/stash/projects/SD/repos/vlc/browse> and centos
>>>>> instruction
>>>>> <https://freeswitch.org/confluence/display/FREESWITCH/Creating+RPM+repositary>
>>>>> .
>>>>> After you intall vlc, then you can enable mod_vlc module in freeswitch
>>>>> sources(SPEC file) and compile freeswitch.
>>>>>
>>>>> Sergey
>>>>>
>>>>>
>>>>> вт, 5 апр. 2016 г. в 10:31, Vincent Gire <vincent.gire at gmail.com>:
>>>>>
>>>>>> webdav, mod_http_cache or mod_httapi all results in sending the
>>>>>> recording only *after* it is complete.
>>>>>> They all write the recording to a file, wait for the recording to
>>>>>> complete and the file to close and then send it over HTTP.
>>>>>>
>>>>>> I would like to start sending the recording to the remove server as
>>>>>> soon as it starts (max 1 sec latency).
>>>>>> mod_http_cache or mod_httapi would be perfect if they were streaming
>>>>>> the recording like mod_shout.
>>>>>>
>>>>>>
>>>>>> On Mon, Apr 4, 2016 at 8:50 PM, Sergey Safarov <s.safarov at gmail.com>
>>>>>> wrote:
>>>>>>
>>>>>>> Input/output latency is not problem.  I use Kazoo on my servers and
>>>>>>> call recording is stored to database during 5 seconds after hangup.
>>>>>>> What is broken in your case if save file using webdav or http_cache?
>>>>>>>
>>>>>>> On Mon, Apr 4, 2016, 21:10 Vincent Gire <vincent.gire at gmail.com>
>>>>>>> wrote:
>>>>>>>
>>>>>>>> Hello Sergey,
>>>>>>>>
>>>>>>>> Thank you for your answer.
>>>>>>>> I've looked into webdav mounted filesystem.
>>>>>>>>
>>>>>>>> Unfortunately, most WebDav clients (especially davfs2 on debian) do
>>>>>>>> a lot of buffering, caching and even lock-null requests (lock a non
>>>>>>>> existent resource before writing to it). I also suspect that they wait for
>>>>>>>> the end of the write operation.
>>>>>>>> The result is a latency of a few seconds witch is not much better
>>>>>>>> than what I achieve with mod_shout if I transcode the MP3.
>>>>>>>>
>>>>>>>> Any other idea ?
>>>>>>>>
>>>>>>>> Thank you !
>>>>>>>>
>>>>>>>> Best regards
>>>>>>>>
>>>>>>>> Vincent
>>>>>>>>
>>>>>>>> On Sun, Apr 3, 2016 at 7:30 PM, Sergey Safarov <s.safarov at gmail.com
>>>>>>>> > wrote:
>>>>>>>>
>>>>>>>>> Please look at webdav mounted filesystem.
>>>>>>>>>
>>>>>>>>> On Sun, Apr 3, 2016, 19:17 Vincent Gire <vincent.gire at gmail.com>
>>>>>>>>> wrote:
>>>>>>>>>
>>>>>>>>>> Hi all,
>>>>>>>>>>
>>>>>>>>>> Thank you to all contributing to FreeSWITCH !
>>>>>>>>>>
>>>>>>>>>> I'm working on a IVR project where logic is implemented on a HTTP
>>>>>>>>>> server.
>>>>>>>>>> We are leaving Twilio because we now need to record and live
>>>>>>>>>> stream the session to the HTTP server in WAV format (chunked transfer
>>>>>>>>>> encoding).
>>>>>>>>>>
>>>>>>>>>> *mod_httapi* looks great (HT TAPI very similar to Twilio's) but
>>>>>>>>>> it seems that the records are first saved to disk before there are sent to
>>>>>>>>>> the server as chunked data.
>>>>>>>>>> We need the transfer to start as soon as the recording starts.
>>>>>>>>>>
>>>>>>>>>> *mod_shout* does start the request almost as the records starts
>>>>>>>>>> but it does not support WAV file and shout:// is not exactly a HTTP request
>>>>>>>>>> (SOURCE method instead of PUT).
>>>>>>>>>>
>>>>>>>>>> Is there a way to use these modules to achieve our goal ?
>>>>>>>>>>
>>>>>>>>>> If not, we are willing to author a specific module or rather
>>>>>>>>>> contribute to the existing ones.
>>>>>>>>>>
>>>>>>>>>> We've identified two approaches:
>>>>>>>>>>
>>>>>>>>>>    1. From *mod_httapi* Modify mod_httapi to directly stream the
>>>>>>>>>>    record instead of completely saving it to disk before the HTTP chunked
>>>>>>>>>>    transfer starts.
>>>>>>>>>>    This seems the most logical but with more than 3000 lines,
>>>>>>>>>>    mod_httapi does not seem to be the easiest module to build upon for
>>>>>>>>>>    newcomers!
>>>>>>>>>>
>>>>>>>>>>    2. From *mod_shout*
>>>>>>>>>>       1. Modify libshoot to replace the custom SOURCE method
>>>>>>>>>>       with standard HTTP PUT method
>>>>>>>>>>       2. Modify mod_shout to support wav files
>>>>>>>>>>       3. Implement our IVR in script (javascript/lua)
>>>>>>>>>>
>>>>>>>>>> What do you think ?
>>>>>>>>>>
>>>>>>>>>> Thank you for your help.
>>>>>>>>>>
>>>>>>>>>> Cheers,
>>>>>>>>>>
>>>>>>>>>
>>>>
>>>> _________________________________________________________________________
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>>>
>>>
>>>
>>> --
>>> Vincent Gire
>>> _________________________________________________________________________
>>> Professional FreeSWITCH Consulting Services:
>>> consulting at freeswitch.org
>>> http://www.freeswitchsolutions.com
>>>
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>>>
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>>
>>
> _________________________________________________________________________
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>
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>
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-- 
Vincent Gire
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