Re: [ecasound] sample count of zero for LADSPA 'run' function

--- On Mon, 9/1/08, Kai Vehmanen <kvehmanen@email-addr-hidden> wrote:

> From: Kai Vehmanen <kvehmanen@email-addr-hidden>
> Subject: Re: [ecasound] sample count of zero for LADSPA 'run' function
> To: "Sergei Steshenko" <sergstesh@email-addr-hidden>
> Cc: ecasound-list@email-addr-hidden
> Date: Monday, September 1, 2008, 12:44 PM
> Hi,
>
> On Mon, 25 Aug 2008, Sergei Steshenko wrote:
> > , so the very last call to LADSPA plugin 'run'
> function has
> >
> > sample_count == 0
> [...]
> > Interestingly enough, if output of ecasound goes to
> file and not to ALSA,
> > there is no such a problem.
>
> this might happen as ecasound choose various buffering
> parameters
> dynamically based on the requested configuration (with
> ALSA, real-time
> properties are important, while with a non-realtime setup,
> throughput is
> more important).
>
> > Can sample_count == 0 be avoided altogether ?
>
> This should be quite rare (the blocksize matches the stream
> length exactly
> and thus end-of-stream is reported with one iteration
> delay). And adding a
> 'if (samples_count > 0)' is not necessarily a
> good idea (performance
> wise). And even if ecasound would filter these out, other
> hosts might
> still pass you zero length buffers, so in the end you just
> have to be
> prepared...
>
> --

I added the check to my plugins.

But having the check in every plugin performance-wise is worse than
having it just once in ecasound.

Regards,
  Sergei.

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Received on Tue Sep 2 00:15:03 2008