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Audio sequencer development - newbie resources?

Started by April 22, 2008
Hi,

I'm starting up my first audio project, adding realtime audio support
to a MIDI program I've developed. I'm looking for resources on the
principles of audio sequencer development, so I don't have to reinvent
the wheel. All I have to do at first is take in realtime input and do
some basic DSP on it. I can find lots of books and resources on DSP
topics, but not audio-sequencer specific.

I have lots of MIDI programming experience, and with realtime, multi-
threaded development. Any kind of training resources would be greatly
appreciated!

Cheers,
Michael
michael@circular-logic.com wrote:
> Hi, > > I'm starting up my first audio project, adding realtime audio support > to a MIDI program I've developed. I'm looking for resources on the > principles of audio sequencer development, so I don't have to reinvent > the wheel. All I have to do at first is take in realtime input and do > some basic DSP on it. I can find lots of books and resources on DSP > topics, but not audio-sequencer specific. >
The principles can be summarized in a sentence: low-latency audio thread + background control thread (e.g. GUI) + some form of message-passing connection between them = standard model-view-controller system. I don't think there are any books as such, but there is lots of source code out there. A list of GPL audio hosts for LADSPA plugins (etc) is here: http://www.ladspa.org Check out Rosegarden, for example. IIRC, it started as a MIDI app and later added audio. Other projects probably did it the other way, adding MIDI support to an audio application. Csound also has a wide variety of GUI front ends these days. "Audio sequencer" can mean a lot of different things (most wheels are round, but come in different sizes and materials, and serve different purposes). Single-track? Multi-track? Graph-based? And what platform you are on make a difference too. A widely used cross-platform audio streaming API supporting full-duplex audio i/o is portaudio (www.portaudio.com). You will find many more kindred spirits on this subject on the musicdsp mailing list. Richard Dobson