[Freeswitch-users] Recording ULAW files

[Anthony Minessale]

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!
>
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-- 
Anthony Minessale II

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