Re: Ecasound and timebase master

Hi,

On Wed, 17 Jul 2013, Julien Claassen wrote:

>  I wondered, if it would be possible for Ecasound to become a timebase 
> master. So, taht it can give JACK hints about beats and bars. I took a look

as a concept this would be fairly messy as Ecasound is not a MIDI 
sequencer and has no concept of tempo, time signature and so forth.

Additionally, the code that implements transport master/slave roles in 
Ecasound is in libecasound/plugins/audioio_jack_manager.cpp and is not 
directly accessable from e.g. effects. So even if the MIDI-world timebase 
information would be relayed from some external source, getting the 
information the right place in Ecasound will not be straightforward.

It's not an impossible idea, and you could try prototyping filling the 
timebase fields in audio_jack_manager.cpp (when Ecasound is a transport 
master) and see how it works out. This should be fairly straightforward as 
it's just a matter of using the existing JACK APIs (and the related 
audio-domain information w.r.t. current audio position and transport 
state), is already available.

A bigger task would be to design how this could be set up (from 
command-line/ECI), and another how to control this (e.g. change tempo) 
during runtime (via ECI?). I don't think the effect interface is directly 
usable for this... some new commands are probably needed.

OTOH, it might be easier to create a standalone tool (maybe modify 
jack_transport that comes with JACK) that can be controlled in runtime, 
and serves as a transport+timebase master for rest of JACK apps. Ecasound 
can sync to this and midish can via jack_midi_clock.

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