A wrapper for AVAudioEngine to help create basic and prosumer multi-track audio applications on iOS.
Chassis is written to abstract away some of the gritty parts of CoreAudio present in multi-track AVAudioEngine usage.
AVAudioEngine works on the basis of AVAudioNodes connected to a mixer node, and then to an output node, much like a recording studio would connect sources to destinations.
Chassis abstracts this away by using a Track model and a simple loadAllTracksAndAddToMix method to add an array of audio files to a node, then to the mixer, and the output.
This saves the end user the trouble of managing audio files, urls, and nodes separately.
Similarly, AVAudioEngine's AVAudioSinkNode provides a way to record input into a file that utilizes Core Audio's ring buffer pattern to populate a new file with the incoming data.
Chassis attempts to abstract this away as well by providing a single startRecording and stopRecording function pair to connect the sink node and populate a file.
To create an instance of Chassis' engine, simply instantiate AudioEngine.
import Chassis
...
private var engine: AudioEngine = AudioEngine()
...To add a file to a mix, create a Track object, and call loadAllTracksAndAddToMix.
import Chassis
...
let newTrack = Track(urlString: Bundle.main.url(forResource: "M1F1-int16s-AFsp",
withExtension: "aif")!.lastPathComponent,
startTime: nil)
engine.loadAllTracksAndAddToMix(tracks: [newTrack])
...Chassis is not meant to be a pro-audio framework, as it abstracts away certain sample-locked parts from the user. Having said that, its main purpose is to facilitate the entry-point to multi-track audio for consumer applications on iOS.
Chassis relies on Combine, so I have decided to make it iOS 13 +.
I have begun updating Issues with a list of issues I'd like to address...collaborators are welcome! There will be many more issues to come; Chassis was ripped out of an ongoing project and packaged up, so a lot of the missing features just haven't been necessary up to now.
I will also be continuing to update this readme with notes about how Chassis is written, and some of its shortcomings.
If something is a mystery, or missing, or confusing, please feel free to write me directly at rawbirdtoe --(at)-- g mail dot com. This is a labor of love to try to make multi-track audio more accessible, but I am fully aware that in its current state it only serves a very narrow set of requirements. I promise not to give up or abandon it, so please add any issues or feature requests!
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