[Freeswitch-dev] question on file format codec

[Seven Du]

ok, I figured out when use conference record, handle->channels = 1, but in uuid_record, handle->channels = 2, so the following code did the trick in fsv_file_write, but I'm not sure if it's the write approach. Why the *len is always 160 in both cases? where the other half channel data goes to? I use play_fsv so the playback should be right. Only tested on 8000HZ right now. If the following code is confusing I can submit a full patch. Thanks.  



uint16_t *x = data;


if (handle->channels == 2) {
/* should we use only one channel ? */
for (int i=0; i<160; i++) {
x[i] = x[i*2];
}
}



--  
Seven Du
Sent with Sparrow (http://www.sparrowmailapp.com/?sig)


On Friday, August 31, 2012 at 8:34 AM, Anthony Minessale wrote:

> Right now it always does raw l16 in any of the io or file funcs
> On Aug 30, 2012 7:23 PM, "dujinfang" <dujinfang at gmail.com (mailto:dujinfang at gmail.com)> wrote:
> > yes, my problem is how to make sure switch_file
> > _write always get L16 data when trigger by uuid_record?
> >  
> > thanks
> >  
> > 发自我的 iPhone
> >  
> > 在 2012-8-31，上午4:36，Anthony Minessale <anthony.minessale at gmail.com (mailto:anthony.minessale at gmail.com)> 写道：
> >  
> > > yes, currently the fsv format expects L16 audio
> > >
> > > On Thu, Aug 30, 2012 at 4:00 AM, Seven Du <dujinfang at gmail.com (mailto:dujinfang at gmail.com)> wrote:
> > >> Hi,
> > >>
> > >> If you noticed the video-media-bug branch, I managed to record a video file
> > >> with the following methods
> > >>
> > >> conference 3000 record /tmp/testrecord.fsv
> > >>
> > >> uuid_record <uuid> start /tmp/testrecord.fsv
> > >>
> > >>
> > >> The first command works perfect as conference voice is L16, but the last one
> > >> has bad audio I guess because it's PCMU ?.
> > >>
> > >> I noticed a SWITCH_FILE_NATIVE flags which is supposed to disable
> > >> transcoding but in my case in mod_fsv the flag is not set so should it
> > >> transcode to L16 before writing to the fsv file?
> > >>
> > >> Thanks.
> > >>
> > >> --
> > >> Seven Du
> > >> Sent with Sparrow
> > >>
> > >>
> > >> _________________________________________________________________________
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> > > --
> > > Anthony Minessale II
> > >
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> > >
> > > 
> > > 
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> >  
> > _________________________________________________________________________
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> > http://www.freeswitchsolutions.com
> >  
> > 
> > 
> >  
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> _________________________________________________________________________
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> http://www.freeswitchsolutions.com
>  
> 
> 
>  
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>  
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