Subject: RE: [linux-audio-dev] MuCoS, Glame, API Issues
From: Richard Guenther (richi_AT_student.uni-tuebingen.de)
Date: ke maalis 08 2000 - 05:00:03 EST
On Tue, 7 Mar 2000, Karl W. MacMillan wrote:
> >
> > It should be no problem to write a wrapper for ladspa plugins. But I just
> > like to know how you handle the case, when the output buffer is larger
> > than the input buffer, when you use effects like echo, delay, etc. The
> > host would have to send an extra zeroed buffer, that has for example the
> > size of the ringbuffer that has to be emptied. The host should be able to
> > query that, if not the host could still sent zeroed buffers and check if
> > they're coming back empty, but somehow I don't like the latter one.
> >
>
> I just joined the list so please flame me for jumping without knowing
> what's happening. Is the plugin architecture geared for realtime effects
> processing (replacing those little black boxes)? If this is the case it
> seems easier to send same size vectors of samples between all plugins.
Yes, this is exactly the point. Usually you dont want the overhead of
allowing "holes" in the audio stream by just bumping a time entry in a
buffer. Synchronizing just via the sample count is enough.
> Because there is a constant stream of data you just wait until you receive
> next vector and write the echo, delay, whatever there (or into whichever
> vector you want). If you want to process fixed length audio files that is
> another problem - still, you probably want all the plugins in a filter
> network (I call this a dsp graph - what is the preferred term here?) to
> process same sized arrays and not add length to the them and let something
> upstream add the extra space to the file (your first suggestion). This is
> especially true since empty (ie buffers with zeroes) may be valid after
> processing - not likely but possible.
>
> Karl
>
> _____________________________________________________
> | Karl W. MacMillan |
> | Peabody Institute of the Johns Hopkins University |
> | Network and Telecommunications Services |
> | karlmac_AT_peabody.jhu.edu |
> | 410/659-8297 |
> -----------------------------------------------------
>
>
>
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