scalaudio is a library is to facilitate audio synthesis/analysis on the JVM by wrapping the Java Sound API in more productive syntax. Its goal is to provide extreme flexibility while reducing verbosity of audio processing code, with the added bonus of type-checking. It aims to be pretty modular (DI for config and output engines via implicits) yet use the same syntax for both real-time and offline processing. Efficiency is a secondary goal, though even in current form some mutable data structures are used to avoid performance snags of constant memory allocation.

This project is currently compiled with Scala 2.11 only (cross-compilation support coming soon).

For use within an SBT project, add the following dependency in build.sbt ("amp" is currently the main library module):

libraryDependencies += "org.auroboros" %% "scalaudio-amp" % "0.1.0-SNAPSHOT"

If referencing a snapshot version, the Sonatype snapshot repository must be added as well:

resolvers += "Sonatype OSS Snapshots" at "https://oss.sonatype.org/content/repositories/snapshots"

Or for other build tools, see:

https://mvnrepository.com/artifact/org.auroboros

Functions can be composed in any way the user chooses (perhaps using .andThen, for example). I prefer scalaz style (see https://github.com/scalaz/scalaz to add if desired, as it is not actually required by scalaudio).

import scalaz._
import Scalaz._

object MyFirstSynthComposition extends App with AmpSyntax {

    // Create audio context using all default settings except for specified single out channel
    implicit val audioContext = AudioContext(ScalaudioConfig(nOutChannels = 1))

    // Create a function that produces a "frame" (Array[Double] where array length is number of out channels)
    val frameFunc = Sine.asFunction(OscState(0, 440.Hz, 0)) // .asFunction is a convenience method from signalz that accepts initial state & produces a state-processing function
      .map(oscState => Array(oscState.sample))

    // a frameFunc or stream of frames can be played directly via implicit conversion to a "signal processing graph" type a la:
    // frameFunc.play(5 seconds)
    // but using the playback helper automatically appends speaker output to the function
    playback(frameFunc, 5 seconds)
}

This project was initially created to facilitate my own computer music composition & audio machine learning projects but I decided to open source it since I only get to work on it in spurts (between my dayjob, other music composition, and toying around with audio in Clojure... some lib from that venture will probably be appearing here soon as well).

It was loosely inspired by Phil Burk's excellent library JSyn (in fact, JSyn is still a dependency as scalaudio borrows some of its utils, though this dependency will likely be cut in a future release).

Please feel free to contribute PRs, I will happily review & pull as I am quite actively supporting this project.