Re: Adjusting write buffer for recording

[Shane Blaser <shane.blaser@callfire.com>]

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comments inline


On Mon, Aug 12, 2013 at 9:03 AM, Jan Stary <hans@stare.cz> wrote:

> On Aug 12 07:31:24, shane.blaser@callfire.com wrote:
> > Yes i am calling stat,
>
> Wouldn't it be easire to just write to a pipe,
> and have your application read from that pipe?
>

Maybe not sure the file seems to work.


> > But I can see that the file size does not change
> > for a few seconds and then the data is flushed.
> >
> > What I am doing is decoding caller id on a phone line:
> > So the flow goes like this:
>
> Please, in the future, _start_ with such top level description
> of what you are trying to do. Make it easy for people to help you.
>

Sorry about that

>
> > 1. rec listening with silence detection
> > 2. Call comes in and recording starts.
> > 3. Caller id is between 1st and second ring.
> > (ok this is were the issue comes in)
> > after the first ring I get the first part of the caller id signal written
> > to disk (call it 1/2 of the caller id signal).
>
> Let me understand this: in the phone calls you are recording,
> there is a piece of _audio_ signal, comming between the
> first and second ring, which carries the caller's ID.
> Is that right? Can you please elaborate? I never knew
> there is something like that coming on a phone line.
>

yes it is audible and it sounds like a fax machine or modem ..

>
> > (listening to the audio I know we have whole signal.)
>
> So this caller ID is an _audible_ signal,
> present in the audio of the phone call?
>

Yes see above

>
> > But not until after the second ring
> > do I get the audio for the rest of the caller id written to disk.
> > Can I have rec write silence to the file after the recording starts?
>
> Of course: just rec(1) everything,
> without using the 'silence' effect.


> What you are doing now is the exact opposite:
> you are telling rec(1) _not_ to write until
> a certain treshold of 'silence' is surpassed.
>
> I am too lazy now to look up your exact 'silence' parameters,
> but could it be that the caller ID audio signal contains
> enough 'silence' so that rec(1) pauses?
>

After the caller id signal there is a silence until the next ring ...

Do you see any way for me to adjust the write buffers, if I can make them
smaller I think this issue will fall away ...?

>
>         Jan
>
>
>
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