Add Core DSP Chain Elements

[mitchmindtree]

We will break this down into several modules.

• SoundUnit
  The base trait for sound units that can be strung together into a DSP-style chain.
• SoundSource
  The base trait for SoundUnits that generate some kind of sound output.
• SoundBuffer
  A wrapper struct for an interleaved floating point buffer with a fixed length that is equal to frames * channels
• SoundSink
  The base trait for sound units that receives audio data, either by pulling from upstream inputs, or from an audio_requested method.
• SoundMixer
  A trait that derives from SoundSink and SoundSource that mixes together inputs from multiple SoundSources.
• SoundEffect
  The base trait for a sound effect, which takes input from an upstream SoundSource and processes it.

These are some base ideas inspired by ofxDspChain (a dsp chain i'm quite familiar with).

[Sven Nilsen]

Remember that since Rust got modules and the crate is named sound, you could have sound::Mixer instead of sound::SoundMixer.

[mitchmindtree]

Buffer is taken by std, but will do this for the others.

[Sven Nilsen]

Well, you can still have sound::Buffer.

I wonder what other people thing about prefixes vs using the module.

Perhaps this will be a problem with traits, since they need to be used to import the methods.

[mitchmindtree]

I think you're right, the module is definitely better, but I think just SoundBuffer is fine for that one, remember the crate is called dsp anyway.

[Sven Nilsen]

Ah, forgot that. Perhaps we should have Sound as prefix for everything then?

[mitchmindtree]

hmm I quite like dsp::Source, dsp::Unit, dsp::Mixer, etc now you mention it haha. What do you think?

[Sven Nilsen]

Let's try it. Rust supports aliasing anyway.

[mitchmindtree]

#5