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| import SwiftUI | |
| import AudioKit | |
| import AudioKitEX | |
| import AVFoundation | |
| import SoundpipeAudioKit | |
| import DunneAudioKit | |
| class AudioEffectsConductorAudioKitService { | |
| private let engine = AudioEngine() | |
| private let leadingVocalAudioPlayer = AudioPlayer() | |
| private let mixer = Mixer() | |
| private var inputType: AudioEffectInputType | |
| // ------------------- | |
| private var leadingVocalAudioFader: Fader! | |
| private var reverbSmallRoom: Reverb! | |
| private var reverbPlate: Reverb! | |
| private var reverbMediumChamber: Reverb! | |
| private var reverbMediumChamberDryWetMixer: DryWetMixer! | |
| private var flanger: Flanger! | |
| private var flangerDryWetMixer: DryWetMixer! | |
| private var highShelfFilter: HighShelfFilter! | |
| private var highShelfFilterDryWetMixer: DryWetMixer! | |
| private var highPassFilter: HighPassFilter! | |
| private var lowPassFilter: LowPassFilter! | |
| private var peakingParametricEqualizerFilter: PeakingParametricEqualizerFilter! | |
| private var bandRejectButterworthFilter: BandRejectButterworthFilter! | |
| private var pitchShifter: PitchShifter! | |
| private var stereoDelay: StereoDelay! | |
| private var delay: Delay! | |
| private var delayDryWetMixer: DryWetMixer! | |
| private var pitchCorrection: PitchCorrectionAudioKitNode! | |
| private var pitchCorrectionDryWetMixer: DryWetMixer! | |
| private var compressor: Compressor! | |
| private var compressorDryWetMixer: DryWetMixer! | |
| private var bandPassButterworth: BandPassButterworthFilter! | |
| private var bandPassButterworthDryWetMixer: DryWetMixer! | |
| // ------------------ | |
| private var harmoniesLowPitchShiftFilter1: PitchShifter! | |
| private var harmoniesLowPitchShiftFilterDryWetMixer1: DryWetMixer! | |
| private var harmoniesHighPitchShiftFilter1: PitchShifter! | |
| private var harmoniesHighPitchShiftFilterDryWetMixer1: DryWetMixer! | |
| private var harmoniesPitchesFilterDryWetMixer1: DryWetMixer! | |
| private var harmoniesFinalFilterDryWetMixer1: DryWetMixer! | |
| // ------------------ | |
| private var harmoniesLowPitchShiftFilter2: PitchShifter! | |
| private var harmoniesLowPitchShiftFilterDryWetMixer2: DryWetMixer! | |
| private var harmoniesHighPitchShiftFilter2: PitchShifter! | |
| private var harmoniesHighPitchShiftFilterDryWetMixer2: DryWetMixer! | |
| private var harmoniesPitchesFilterDryWetMixer2: DryWetMixer! | |
| private var harmoniesFinalFilterDryWetMixer2: DryWetMixer! | |
| // ------------------ | |
| @Injected private var config: ConfigRepository | |
| @Injected private var supportService: SupportRepository | |
| // ------------------ | |
| private var isInitialized = false | |
| private var selectedVolume: Float = 1 | |
| private var selectedPitchCorrectionSpeed: Float = 0 | |
| private var selectedDecibelCutoff: Float = -60 | |
| // ------------------ | |
| init(inputType: AudioEffectInputType) { | |
| self.inputType = inputType | |
| // if isLooping = false (default) seek doesn’t work properly | |
| leadingVocalAudioPlayer.isLooping = true | |
| } | |
| private func initializeEffects() { | |
| let inputNode = engine.input | |
| guard let inputNode else { return } | |
| guard !isInitialized else { return } | |
| isInitialized = true | |
| // ------------------ | |
| leadingVocalAudioFader = Fader(inputNode, gain: 1) | |
| pitchCorrection = PitchCorrectionAudioKitNode(leadingVocalAudioFader) | |
| pitchCorrectionDryWetMixer = DryWetMixer(leadingVocalAudioFader, pitchCorrection, balance: 0) | |
| // ------------------ | |
| highPassFilter = HighPassFilter(pitchCorrectionDryWetMixer) | |
| highPassFilter.resonance = 0 | |
| // ------------------ | |
| lowPassFilter = LowPassFilter(highPassFilter) | |
| lowPassFilter.resonance = 0 | |
| // ------------------ | |
| compressor = Compressor(lowPassFilter) | |
| compressor.masterGain = 0 | |
| compressor.attackTime = 0.2 | |
| compressor.releaseTime = 1.5 | |
| compressorDryWetMixer = DryWetMixer(lowPassFilter, compressor, balance: 0) | |
| // ------------------ | |
| peakingParametricEqualizerFilter = PeakingParametricEqualizerFilter(compressorDryWetMixer) | |
| peakingParametricEqualizerFilter.centerFrequency = 3000 | |
| peakingParametricEqualizerFilter.q = 0.6 | |
| peakingParametricEqualizerFilter.gain = 1 | |
| // ------------------ | |
| bandRejectButterworthFilter = BandRejectButterworthFilter(peakingParametricEqualizerFilter) | |
| bandRejectButterworthFilter.bandwidth = 100 | |
| // ------------------ | |
| bandPassButterworth = BandPassButterworthFilter(bandRejectButterworthFilter) | |
| bandPassButterworth.bandwidth = 4000 | |
| bandPassButterworth.centerFrequency = 0 | |
| bandPassButterworthDryWetMixer = DryWetMixer(bandRejectButterworthFilter, bandPassButterworth, balance: 0) | |
| // ------------------ | |
| highShelfFilter = HighShelfFilter(bandPassButterworthDryWetMixer, gain: 0) | |
| highShelfFilterDryWetMixer = DryWetMixer(bandPassButterworthDryWetMixer, highShelfFilter, balance: 0) | |
| // ------------------ | |
| stereoDelay = StereoDelay(highShelfFilterDryWetMixer) | |
| stereoDelay.feedback = 0 | |
| stereoDelay.time = 0.5 | |
| stereoDelay.dryWetMix = 0.8 | |
| stereoDelay.pingPong = 1 | |
| // ------------------ | |
| reverbSmallRoom = Reverb(stereoDelay) | |
| reverbSmallRoom.dryWetMix = 0 | |
| reverbSmallRoom.loadFactoryPreset(.smallRoom) | |
| // ------------------ | |
| reverbPlate = Reverb(reverbSmallRoom) | |
| reverbPlate.dryWetMix = 0 | |
| reverbPlate.loadFactoryPreset(.plate) | |
| // ------------------ | |
| delay = Delay(reverbPlate) | |
| delay.feedback = 10 | |
| delay.time = 0.125 | |
| delay.dryWetMix = 0 | |
| delayDryWetMixer = DryWetMixer(reverbPlate, delay, balance: 0.5) | |
| // ------------------ | |
| reverbMediumChamber = Reverb(delayDryWetMixer) | |
| reverbMediumChamber.dryWetMix = 0 | |
| reverbMediumChamber.loadFactoryPreset(.mediumChamber) | |
| reverbMediumChamberDryWetMixer = DryWetMixer(delayDryWetMixer, reverbMediumChamber, balance: 0) | |
| // ------------------ | |
| pitchShifter = PitchShifter(reverbMediumChamberDryWetMixer) | |
| // ------------------ | |
| harmoniesLowPitchShiftFilter1 = PitchShifter(pitchShifter, shift: -12) | |
| harmoniesLowPitchShiftFilterDryWetMixer1 = DryWetMixer(pitchShifter, harmoniesLowPitchShiftFilter1, balance: 0.7) | |
| harmoniesHighPitchShiftFilter1 = PitchShifter(pitchShifter, shift: 12) | |
| harmoniesHighPitchShiftFilterDryWetMixer1 = DryWetMixer(pitchShifter, harmoniesHighPitchShiftFilter1, balance: 0.3) | |
| harmoniesPitchesFilterDryWetMixer1 = DryWetMixer(harmoniesHighPitchShiftFilterDryWetMixer1, harmoniesLowPitchShiftFilterDryWetMixer1, balance: 0.5) | |
| harmoniesFinalFilterDryWetMixer1 = DryWetMixer(pitchShifter, harmoniesPitchesFilterDryWetMixer1, balance: 0) | |
| // ------------------ | |
| harmoniesLowPitchShiftFilter2 = PitchShifter(harmoniesFinalFilterDryWetMixer1, shift: -3) | |
| harmoniesHighPitchShiftFilter2 = PitchShifter(harmoniesFinalFilterDryWetMixer1, shift: 8) | |
| harmoniesPitchesFilterDryWetMixer2 = DryWetMixer(harmoniesLowPitchShiftFilter2, harmoniesHighPitchShiftFilter2, balance: 0.5) | |
| harmoniesFinalFilterDryWetMixer2 = DryWetMixer(harmoniesFinalFilterDryWetMixer1, harmoniesPitchesFilterDryWetMixer2, balance: 0) | |
| // ------------------ | |
| flanger = Flanger(harmoniesFinalFilterDryWetMixer2) | |
| flanger.frequency = 1 | |
| flanger.depth = 1 | |
| flanger.feedback = 0 | |
| flanger.dryWetMix = 1 | |
| flangerDryWetMixer = DryWetMixer(harmoniesFinalFilterDryWetMixer2, flanger) | |
| flangerDryWetMixer.balance = 0.5 | |
| } | |
| func start() { | |
| if engine.avEngine.isRunning { | |
| return | |
| } | |
| initializeEffects() | |
| startMic() | |
| } | |
| } | |
| extension AudioEffectsConductorAudioKitService { | |
| private func startMic() { | |
| if engine.output == nil { | |
| engine.output = flangerDryWetMixer | |
| engine.input?.avAudioNode.installTap(onBus: 0, bufferSize: 8, format: nil) { [weak self] buffer, time in | |
| guard let self else { return } | |
| let decibels = buffer.calculateDecibelValue() | |
| if decibels < selectedDecibelCutoff { | |
| if leadingVocalAudioFader.gain > 0.2 { | |
| leadingVocalAudioFader.gain = selectedVolume < 0.2 ? selectedVolume : 0.2 | |
| } | |
| } else if leadingVocalAudioFader.gain < selectedVolume { | |
| leadingVocalAudioFader.gain = selectedVolume | |
| } | |
| } | |
| } | |
| do { | |
| try engine.start() | |
| } catch { | |
| print("poop mic test Audio Engine failed to start: \(error)") | |
| } | |
| } | |
| private func stopMic() { | |
| engine.stop() | |
| } | |
| } |
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