Subject: Re: [linux-audio-dev] Streaming client for JACK
From: Paul Davis (pbd_AT_Op.Net)
Date: Thu Jan 17 2002 - 22:06:32 EET
>>the only problem i see is that the port can only serve one "view" of
>>the file at a time. if you wanted to play two copies of the same
>>sound, but offset from one another, you'd need different copies of the
>>same client. JACK doesn't scale well for this kind of thing, so ....
>
>That's probally something that would be pretty common.
>
>>LADSPA!
>>
>>pretty well. it would basically be like taking the disk streaming code
>>from ardour, removing the transport dependent stuff from it (which is
>>a large part of it), and packaging it as a LADSPA plugin.
>
>What's your ballpark estimate on what kind of effort this would be?
>That looks like the way to start since you probally have solved most
>of the issues that would come up.
I think I could write a reasonably working example in 2 days if I had
a day to think about it first. Ardour has sample code, as does
ecasound, alsaplayer and a few other programs that do threaded-disk
i/o. The tricky part is to use that stuff in a thread that services
every instance of the plugin, rather than one thread per instance.
there is, however, a really tricky problem with doing this in LADSPA:
there is no support for string variables, so there is no way to set
the filename to be used.
--p
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