[Freeswitch-users] Recording ULAW files

[Anthony Minessale]

The default audio framework operates on raw audio.
The mod_native_file triggers a special flag that tells the higher level
api's for recording not
to transcode the audio first.

It would probably be easier for you to use the api_hangup_hook variable to
trigger a sox command
to wrap the files in a wav or use a batch process in cron to do so than to
try to figure it out in the code.


On Wed, Jan 21, 2009 at 1:05 PM, <freeswitch-users at digitaldan.com> wrote:

> Thanks for the quick reply.
>
> I'm new to this project so I'm not familiar with the inner workings just
> yet but at looking at mod_native_file.c it seems this is a thin wrapper
> around the switch's own file input and output routines?  Would it be best to
> change this class or register a new file type, like .ul?  If so, where would
> be a good starting point.
>
>
> ----- Original Message -----
> From: "Anthony Minessale" <anthony.minessale at gmail.com>
> To: freeswitch-users at lists.freeswitch.org
> Sent: Wednesday, January 21, 2009 10:56:45 AM GMT -07:00 US/Canada Mountain
> Subject: Re: [Freeswitch-users] Recording ULAW files
>
> no, there is currently no way to do that.
> It would be feasible to add an option to mod_native_file to write wav
> headers around the raw data but it has not been attempted.
>
>
>
> On Wed, Jan 21, 2009 at 10:48 AM, <freeswitch-users at digitaldan.com> wrote:
>
>> Hi,  I'm recording files using the pcmu extension in order to save them in
>> the g.711 ulaw format, which is what everything in my network uses.  It
>> appears that the recorded file is just raw data without a header.  Is there
>> any way to save this as a wav type with a header (keeping the ulaw format)?
>>
>> for example,  running the unix command 'file' on the recording prints:
>> /tmp/185065_f7bb8e0c-e641-11dd-800d-5ffe41c540dd.PCMU: data
>>
>> if I run it through sox  which just outputs the same data (ulaw,8000,mono)
>> but specifying the type as wav
>> /usr/bin/sox -t .ul -r 8000 -c 1 -b -U file.pcmu -t wav -r 8000 -c 1 -b -U
>> file.wav
>>
>> it produces a file that shows:
>> /tmp/185065_f7bb8e0c-e641-11dd-800d-5ffe41c540dd.wav: RIFF (little-endian)
>> data, WAVE audio, ITU G.711 mu-law, mono 8000 Hz
>>
>> if I try and save it within freeswitch using the wav extension, it
>> trans-codes it to a pcm format
>>  RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, mono 8000
>> Hz
>>
>> Is there any way to have freeswitch record the file as ulaw with the RIFF
>> wav header?
>>
>> Thanks!
>>
>> _______________________________________________
>> 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
>
> FreeSWITCH http://www.freeswitch.org/
> ClueCon http://www.cluecon.com/
>
> AIM: anthm
> MSN:anthony_minessale at hotmail.com <MSN%3Aanthony_minessale at hotmail.com>
> GTALK/JABBER/PAYPAL:anthony.minessale at gmail.com<PAYPAL%3Aanthony.minessale at gmail.com>
> IRC: irc.freenode.net #freeswitch
>
> FreeSWITCH Developer Conference
> sip:888 at conference.freeswitch.org <sip%3A888 at conference.freeswitch.org>
> iax:guest at conference.freeswitch.org/888
> googletalk:conf+888 at conference.freeswitch.org<googletalk%3Aconf%2B888 at conference.freeswitch.org>
> pstn:213-799-1400
>
> _______________________________________________ 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
>
> _______________________________________________
> 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

FreeSWITCH http://www.freeswitch.org/
ClueCon http://www.cluecon.com/

AIM: anthm
MSN:anthony_minessale at hotmail.com <MSN%3Aanthony_minessale at hotmail.com>
GTALK/JABBER/PAYPAL:anthony.minessale at gmail.com<PAYPAL%3Aanthony.minessale at gmail.com>
IRC: irc.freenode.net #freeswitch

FreeSWITCH Developer Conference
sip:888 at conference.freeswitch.org <sip%3A888 at conference.freeswitch.org>
iax:guest at conference.freeswitch.org/888
googletalk:conf+888 at conference.freeswitch.org<googletalk%3Aconf%2B888 at conference.freeswitch.org>
pstn:213-799-1400
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.freeswitch.org/pipermail/freeswitch-users/attachments/20090121/70e53d6e/attachment-0002.html