Re: [fluid-dev] Sample-accurate timing

[Ken Restivo]

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On Thu, Jun 07, 2007 at 03:02:10PM -0700, Nathaniel Gray wrote:
> Hi fluid-devs,
> 
> I'm doing a VST/AU/etc embedding of FluidSynth and I've had a lot of  
> success so far, but there's one issue I'm not sure about.  As usual  
> in audio plugin architectures, I've got a callback for rendering a  
> "chunk" of audio samples.  The callback also gets a list of midi  
> events that should occur within the chunk, along with the sample  
> offset of each event within the chunk.  My current approach is just  
> to throw away the offset and trigger every event at the beginning of  
> the chunk, since I couldn't see a way to schedule an event without  
> using the sequencer interface (which would probably be overkill).   
> This is not *too* bad, but I'd really prefer to get sample-accurate  
> timing.  Is there some way to do this?
> 
> BTW, I'll let you know when the plugin is ready for public consumption.
> 
> Thanks,
> -n8
> 
> PS:  I know this is the fluidsynth list, but I know Josh is around  
> here and I thought you might want to know that the swami website is  
> dead with some trac error.
> 

The best and perhaps easiest way to get sample-accurate timing would be to 
support JACK MIDI, which is in the currently-released JACK, and will be in the 
1.0 JACK release too.

This will also enable a very cool feature: with JACK MIDI, one can dump an 
entire MIDI-based sequence to a wav file, in "freewheeling mode" (faster than 
RT), in sync with audio tracks using a DAW, an excellent feature for dumping 
mixes.

The JACK MIDI API is also reported to be easier and saner than ALSA, and more 
reliable, and sample-accurate using the same clock as JACK transport.

- -ken
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