28 Oct
2008
28 Oct
'08
12:32 p.m.
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Fons Adriaensen wrote:
Hello all,
Would there be a simple way to import plugin
automation data into an Ardour session ?
'Simple' may include writing some software, but
not any major project :-)
both ardour track and plugin automation data is stored in text files,
named after 'projectname-plugin-trackid.automation'. The First line is
"version <num>" each line thereafter
<type> <timestamp(in samples)> <value>
The only valid type is 'g' corresponding to gain_automation_curve() see
libs/ardour/io.cc:1715 - it seems like plugin-automation use LADSPA-port
numbers as type; but I have not verified that in the source.
http://code.google.com/p/noisesmith-linux-audio/downloads/detail?name=lados…
offers both an OSC input and output as LADSPA plugin.
The situation I want to handle is this:
We have a Csound, SC3, PD, program generating
a number of audio signals, and also simple
OSC commands that would control external
processing of these signals, e.g. surround
panning or movement implemented by an
external system.
Last June I set up a system like this;
http://mir.dnsalias.com/oss/panjack/ is a small JACK c-program that
processes external input (either MIDI or OSC) to pan audio sources. I
had 6 audio-inputs to 10 speakers and up to 12 parameters for panning
(either angle and width or X/Y coordinates) - PD did not manage to run
that in realtime but I'm sure I could have optimized the sqrt()s. Since
we had live audio sources and not only playback, I eventually ended up
mixing it live (with a BCF2000 and panjack) rather than automating it
with ardour.
The signals each become a mono track in Ardour,
while the OSC controlled parameters are stored
as automation data for a LADSPA plugin in each
track. On playback, the plugin just sends this
data to the external application.
yes, works like a charm with a little random latency due to UDP.
There are a few minor issues to consider: when moving the playhead in
ardour you can skip over OSC commands and a badly designed receiving
application may end up in a wrong state.
The whole point is to combine a number of such
compositions into a single Ardour session that
can be looped without any user intervention.
so you're looking for an OSC-sequencer with jack-transport control.
maybe turn it around: have PD control ardour ?!
2c,
robin
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