64 lines
3.6 KiB
C#
64 lines
3.6 KiB
C#
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using AVFoundation;
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using Foundation;
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namespace VoiceCat.iOS;
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internal enum IosAudioPreset { VoiceChat, StereoMicrophone, MonoMicrophone, Advanced }
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internal sealed class IosAudioRouter
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{
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internal static IosAudioRouter Shared { get; } = new();
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private readonly NSUserDefaults defaults = NSUserDefaults.StandardUserDefaults;
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internal IosAudioPreset Preset { get; private set; } = IosAudioPreset.VoiceChat;
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internal bool ForceSpeaker { get; set; }
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internal bool VoiceProcessing { get; set; } = true;
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internal bool AutomaticGainControl { get; set; } = true;
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internal int CaptureChannels => Preset == IosAudioPreset.StereoMicrophone ? 2 : 1;
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internal bool UsesVoiceProcessing => VoiceProcessing && CaptureChannels == 1 && Preset != IosAudioPreset.MonoMicrophone;
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private IosAudioRouter()
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{
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NSNotificationCenter.DefaultCenter.AddObserver(AVAudioSession.RouteChangeNotification, _ => Recover());
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NSNotificationCenter.DefaultCenter.AddObserver(AVAudioSession.InterruptionNotification, note => HandleInterruption(note));
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NSNotificationCenter.DefaultCenter.AddObserver(AVAudioSession.MediaServicesWereResetNotification, _ => Recover());
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}
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internal void Load()
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{
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string? preset = defaults.StringForKey("cat.voice.audio.preset");
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if (Enum.TryParse(preset, true, out IosAudioPreset value)) Preset = value;
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ForceSpeaker = defaults.BoolForKey("cat.voice.audio.forceSpeaker");
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VoiceProcessing = defaults.ValueForKey(new NSString("cat.voice.audio.voiceProcessing")) is null || defaults.BoolForKey("cat.voice.audio.voiceProcessing");
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AutomaticGainControl = defaults.ValueForKey(new NSString("cat.voice.audio.agc")) is null || defaults.BoolForKey("cat.voice.audio.agc");
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}
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internal void SelectPreset(IosAudioPreset preset)
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{
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Preset = preset; defaults.SetString(preset.ToString(), "cat.voice.audio.preset"); defaults.Synchronize();
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if (IosAudioEngine.Shared.IsConnected) IosAudioEngine.Shared.Reconfigure();
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}
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internal void Apply()
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{
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AVAudioSession session = AVAudioSession.SharedInstance();
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AVAudioSessionCategoryOptions options = AVAudioSessionCategoryOptions.AllowBluetooth;
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if (Preset is IosAudioPreset.StereoMicrophone or IosAudioPreset.MonoMicrophone)
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options = AVAudioSessionCategoryOptions.AllowBluetoothA2DP | AVAudioSessionCategoryOptions.DefaultToSpeaker;
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if (!session.SetCategory(AVAudioSessionCategory.PlayAndRecord, AVAudioSessionMode.Default, options, out NSError? categoryError))
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throw new InvalidOperationException(categoryError.LocalizedDescription);
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session.SetPreferredSampleRate(48_000, out _);
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session.SetPreferredIOBufferDuration(0.02, out _);
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if (!session.SetActive(true, AVAudioSessionSetActiveOptions.NotifyOthersOnDeactivation, out NSError? activeError))
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throw new InvalidOperationException(activeError.LocalizedDescription);
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session.OverrideOutputAudioPort(ForceSpeaker ? AVAudioSessionPortOverride.Speaker : AVAudioSessionPortOverride.None, out _);
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}
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internal void Deactivate() => AVAudioSession.SharedInstance().SetActive(false, AVAudioSessionSetActiveOptions.NotifyOthersOnDeactivation, out _);
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private void Recover() { if (IosAudioEngine.Shared.IsConnected) UIApplication.SharedApplication.BeginInvokeOnMainThread(IosAudioEngine.Shared.Reconfigure); }
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private void HandleInterruption(NSNotification note)
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{
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NSNumber? type = note.UserInfo?[new NSString("AVAudioSessionInterruptionTypeKey")] as NSNumber;
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if ((AVAudioSessionInterruptionType)(type?.UInt32Value ?? 0) == AVAudioSessionInterruptionType.Ended) Recover();
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}
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}
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