-
Notifications
You must be signed in to change notification settings - Fork 20
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
Showing
20 changed files
with
786 additions
and
101 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
311 changes: 311 additions & 0 deletions
311
TemplateProject/app/Common/Audio/SimplePlayEngine.swift
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,311 @@ | ||
| import Foundation | ||
| import CoreAudioKit | ||
| import AVFoundation | ||
| import TemplateProjectAU | ||
|
|
||
| #if os(iOS) | ||
| import UIKit | ||
| #elseif os(macOS) | ||
| import AppKit | ||
| #endif | ||
|
|
||
| /// Wraps and Audio Unit extension and provides helper functions. | ||
| extension AVAudioUnit { | ||
|
|
||
| var wantsAudioInput: Bool { | ||
| let componentType = self.auAudioUnit.componentDescription.componentType | ||
| return componentType == kAudioUnitType_MusicEffect || componentType == kAudioUnitType_Effect | ||
| } | ||
|
|
||
| static fileprivate func findComponent(type: String, subType: String, manufacturer: String) -> AVAudioUnitComponent? { | ||
| // Make a component description matching any Audio Unit of the selected component type. | ||
| let description = AudioComponentDescription(componentType: type.fourCharCode!, | ||
| componentSubType: subType.fourCharCode!, | ||
| componentManufacturer: manufacturer.fourCharCode!, | ||
| componentFlags: 0, | ||
| componentFlagsMask: 0) | ||
|
|
||
| AUAudioUnit.registerSubclass(IPlugAUAudioUnit_vTemplateProject.self, as: description, name: "TemplateProject", version: 1) | ||
|
|
||
| return AVAudioUnitComponentManager.shared().components(matching: description).first | ||
| } | ||
|
|
||
|
|
||
| fileprivate func loadAudioUnitViewController(completion: @escaping (ViewController?) -> Void) { | ||
| auAudioUnit.requestViewController { [weak self] viewController in | ||
| DispatchQueue.main.async { | ||
|
|
||
| if let self = self, viewController == nil { | ||
| let auViewController = UIStoryboard(name: "TemplateProject-iOS-MainInterface", bundle: nil).instantiateViewController(withIdentifier: "IPlugAUViewController_vTemplateProject") as! IPlugAUViewController_vTemplateProject | ||
| auViewController.audioUnit = self.auAudioUnit; | ||
| completion(auViewController) | ||
| return | ||
| } | ||
| else if #available(macOS 13.0, iOS 16.0, *) { | ||
| if let self = self, viewController == nil { | ||
| let genericViewController = AUGenericViewController() | ||
| genericViewController.auAudioUnit = self.auAudioUnit | ||
| completion(genericViewController) | ||
| return | ||
| } | ||
| } | ||
| completion(viewController) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /// Manages the interaction with the AudioToolbox and AVFoundation frameworks. | ||
| public class SimplePlayEngine { | ||
|
|
||
| private var avAudioUnit: AVAudioUnit? | ||
|
|
||
| // Synchronizes starting/stopping the engine and scheduling file segments. | ||
| private let stateChangeQueue = DispatchQueue(label: "com.example.apple-samplecode.StateChangeQueue") | ||
|
|
||
| // Playback engine. | ||
| private let engine = AVAudioEngine() | ||
|
|
||
| // Engine's player node. | ||
| private let player = AVAudioPlayerNode() | ||
|
|
||
| // File to play. | ||
| private var file: AVAudioFile? | ||
|
|
||
| // Whether we are playing. | ||
| private (set) var isPlaying = false | ||
|
|
||
| // This block will be called every render cycle and will receive MIDI events | ||
| private let midiOutBlock: AUMIDIOutputEventBlock = { sampleTime, cable, length, data in return noErr } | ||
|
|
||
| // This block can be used to send MIDI UMP events to the Audio Unit | ||
| var scheduleMIDIEventListBlock: AUMIDIEventListBlock? = nil | ||
|
|
||
| // MARK: Initialization | ||
|
|
||
| public init() { | ||
| engine.attach(player) | ||
|
|
||
| guard let fileURL = Bundle.main.url(forResource: "Synth", withExtension: "aif") else { | ||
| fatalError("\"Synth.aif\" file not found.") | ||
| } | ||
| setPlayerFile(fileURL) | ||
|
|
||
| engine.prepare() | ||
| setupMIDI() | ||
| } | ||
|
|
||
| private func setupMIDI() { | ||
| if !MIDIManager.shared.setupPort(midiProtocol: MIDIProtocolID._2_0, receiveBlock: { [weak self] eventList, _ in | ||
| if let scheduleMIDIEventListBlock = self?.scheduleMIDIEventListBlock { | ||
| _ = scheduleMIDIEventListBlock(AUEventSampleTimeImmediate, 0, eventList) | ||
| } | ||
| }) { | ||
| fatalError("Failed to setup Core MIDI") | ||
| } | ||
| } | ||
|
|
||
| func initComponent(type: String, subType: String, manufacturer: String, completion: @escaping (Result<Bool, Error>, ViewController?) -> Void) { | ||
|
|
||
| guard let component = AVAudioUnit.findComponent(type: type, subType: subType, manufacturer: manufacturer) else { | ||
| fatalError("Failed to find component with type: \(type), subtype: \(subType), manufacturer: \(manufacturer))" ) | ||
| } | ||
|
|
||
| // Instantiate the audio unit. | ||
| AVAudioUnit.instantiate(with: component.audioComponentDescription, | ||
| options: AudioComponentInstantiationOptions.loadOutOfProcess) { avAudioUnit, error in | ||
|
|
||
| guard let audioUnit = avAudioUnit, error == nil else { | ||
| completion(.failure(error!), nil) | ||
| return | ||
| } | ||
|
|
||
| self.avAudioUnit = audioUnit | ||
|
|
||
| self.connect(avAudioUnit: audioUnit) | ||
|
|
||
| // Load view controller and call completion handler | ||
| audioUnit.loadAudioUnitViewController { viewController in | ||
| completion(.success(true), viewController) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private func setPlayerFile(_ fileURL: URL) { | ||
| do { | ||
| let file = try AVAudioFile(forReading: fileURL) | ||
| self.file = file | ||
| engine.connect(player, to: engine.mainMixerNode, format: file.processingFormat) | ||
| } catch { | ||
| fatalError("Could not create AVAudioFile instance. error: \(error).") | ||
| } | ||
| } | ||
|
|
||
| private func setSessionActive(_ active: Bool) { | ||
| #if os(iOS) | ||
| do { | ||
| let session = AVAudioSession.sharedInstance() | ||
| try session.setCategory(.playback, mode: .default) | ||
| try session.setActive(active) | ||
| } catch { | ||
| fatalError("Could not set Audio Session active \(active). error: \(error).") | ||
| } | ||
| #endif | ||
| } | ||
|
|
||
| // MARK: Playback State | ||
|
|
||
| public func startPlaying() { | ||
| stateChangeQueue.sync { | ||
| if !self.isPlaying { self.startPlayingInternal() } | ||
| } | ||
| } | ||
|
|
||
| public func stopPlaying() { | ||
| stateChangeQueue.sync { | ||
| if self.isPlaying { self.stopPlayingInternal() } | ||
| } | ||
| } | ||
|
|
||
| public func togglePlay() -> Bool { | ||
| if isPlaying { | ||
| stopPlaying() | ||
| } else { | ||
| startPlaying() | ||
| } | ||
| return isPlaying | ||
| } | ||
|
|
||
| private func startPlayingInternal() { | ||
| guard let avAudioUnit = self.avAudioUnit else { | ||
| return | ||
| } | ||
|
|
||
| // assumptions: we are protected by stateChangeQueue. we are not playing. | ||
| setSessionActive(true) | ||
|
|
||
| if avAudioUnit.wantsAudioInput { | ||
| // Schedule buffers on the player. | ||
| scheduleEffectLoop() | ||
| scheduleEffectLoop() | ||
| } | ||
|
|
||
| let hardwareFormat = engine.outputNode.outputFormat(forBus: 0) | ||
| engine.connect(engine.mainMixerNode, to: engine.outputNode, format: hardwareFormat) | ||
|
|
||
| // Start the engine. | ||
| do { | ||
| try engine.start() | ||
| } catch { | ||
| isPlaying = false | ||
| fatalError("Could not start engine. error: \(error).") | ||
| } | ||
|
|
||
| if avAudioUnit.wantsAudioInput { | ||
| // Start the player. | ||
| player.play() | ||
| } | ||
|
|
||
| isPlaying = true | ||
| } | ||
|
|
||
| private func stopPlayingInternal() { | ||
| guard let avAudioUnit = self.avAudioUnit else { | ||
| return | ||
| } | ||
|
|
||
| if avAudioUnit.wantsAudioInput { | ||
| player.stop() | ||
| } | ||
| engine.stop() | ||
| isPlaying = false | ||
| setSessionActive(false) | ||
| } | ||
|
|
||
| private func scheduleEffectLoop() { | ||
| guard let file = file else { | ||
| fatalError("`file` must not be nil in \(#function).") | ||
| } | ||
|
|
||
| player.scheduleFile(file, at: nil) { | ||
| self.stateChangeQueue.async { | ||
| if self.isPlaying { | ||
| self.scheduleEffectLoop() | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private func resetAudioLoop() { | ||
| guard let avAudioUnit = self.avAudioUnit else { | ||
| return | ||
| } | ||
|
|
||
| if avAudioUnit.wantsAudioInput { | ||
| // Connect player -> mixer. | ||
| guard let format = file?.processingFormat else { fatalError("No AVAudioFile defined (processing format unavailable).") } | ||
| engine.connect(player, to: engine.mainMixerNode, format: format) | ||
| } | ||
| } | ||
|
|
||
| public func reset() { | ||
| connect(avAudioUnit: nil) | ||
| } | ||
|
|
||
| public func connect(avAudioUnit: AVAudioUnit?, completion: @escaping (() -> Void) = {}) { | ||
| guard let avAudioUnit = self.avAudioUnit else { | ||
| return | ||
| } | ||
|
|
||
| // Break the audio unit -> mixer connection | ||
| engine.disconnectNodeInput(engine.mainMixerNode) | ||
|
|
||
| resetAudioLoop() | ||
|
|
||
| // We're done with the unit; release all references. | ||
| engine.detach(avAudioUnit) | ||
|
|
||
| // Internal function to resume playing and call the completion handler. | ||
| func rewiringComplete() { | ||
| scheduleMIDIEventListBlock = auAudioUnit.scheduleMIDIEventListBlock | ||
| if isPlaying { | ||
| player.play() | ||
| } | ||
| completion() | ||
| } | ||
|
|
||
| let hardwareFormat = engine.outputNode.outputFormat(forBus: 0) | ||
|
|
||
| // Connect the main mixer -> output node | ||
| engine.connect(engine.mainMixerNode, to: engine.outputNode, format: hardwareFormat) | ||
|
|
||
| // Pause the player before re-wiring it. It is not simple to keep it playing across an insertion or deletion. | ||
| if isPlaying { | ||
| player.pause() | ||
| } | ||
|
|
||
| let auAudioUnit = avAudioUnit.auAudioUnit | ||
|
|
||
| if !auAudioUnit.midiOutputNames.isEmpty { | ||
| auAudioUnit.midiOutputEventBlock = midiOutBlock | ||
| } | ||
|
|
||
| // Attach the AVAudioUnit the the graph. | ||
| engine.attach(avAudioUnit) | ||
|
|
||
| if avAudioUnit.wantsAudioInput { | ||
| // Disconnect the player -> mixer. | ||
| engine.disconnectNodeInput(engine.mainMixerNode) | ||
|
|
||
| // Connect the player -> effect -> mixer. | ||
| if let format = file?.processingFormat { | ||
| engine.connect(player, to: avAudioUnit, format: format) | ||
| engine.connect(avAudioUnit, to: engine.mainMixerNode, format: format) | ||
| } | ||
| } else { | ||
| let stereoFormat = AVAudioFormat(standardFormatWithSampleRate: hardwareFormat.sampleRate, channels: 2) | ||
| engine.connect(avAudioUnit, to: engine.mainMixerNode, format: stereoFormat) | ||
| } | ||
| rewiringComplete() | ||
| } | ||
| } |
Binary file not shown.
Oops, something went wrong.