[asterisk-users] How to record and playback at the same time

[Motiejus Jakštys]

On Thu, Jul 29, 2010 at 2:32 PM, Benny Amorsen <benny+usenet at amorsen.dk> wrote:
> Sherwood McGowan <sherwood.mcgowan at gmail.com> writes:
>
>> I'm going to go ahead and say that while I'm not one of the
>> developers, I think it's safe to say that you cannot record to a file
>> and play it back at the same time. Probably something like file
>> locking (for the record, locks it from access by other processes,
>> etc)...
>
> There is nothing in Unix/Linux which prevents the playback of a file
> while it is being recorded. File locks in Linux are purely advisory; it
> is up to the applications whether they choose to respect them.
>
> The only challenge is whether the header has been written correctly, and
> you should be able to do without that in a pinch. What happens if you
> copy the half-written file to a computer with speakers and try to play
> it through the speakers?
>

Even (incorrect) headers are not a problem if you know the exact file format.
apt-get/yum/pacman/emerge/whatever install/-S/whatever sox
man (sox|play)
Quick grep through sox source did not yield any fcntl functions, IMHO
sox should ignore any "locked" files and you should be able to play
them without problems.

Motiejus