/*

    Copyright (C) 2017 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    AudioEngine is the main controller class that creates the following objects:

                    AVAudioEngine               *_engine;

                    AVAudioUnitSampler          *_sampler;

                    AVAudioUnitDistortion       *_distortion;

                    AVAudioUnitReverb           *_reverb;

                    AVAudioPlayerNode           *_player;

                    AVAudioSequencer            *_sequencer;

                    AVAudioPCMBuffer            *_playerLoopBuffer;

                It connects all the nodes, loads the buffers as well as controls the AVAudioEngine object itself.

*/

@import Foundation;

// Other nodes/objects can listen to this to determine when the user finishes a recording

static NSString *kRecordingCompletedNotification = @"RecordingCompletedNotification";

static NSString *kShouldEnginePauseNotification = @"kShouldEnginePauseNotification";

@protocol AudioEngineDelegate <NSObject>

@optional

- (void)engineWasInterrupted;

- (void)engineConfigurationHasChanged;

- (void)engineHasBeenPaused;

- (void)mixerOutputFilePlayerHasStopped;

@end

@interface AudioEngine : NSObject

@property (nonatomic, readonly) BOOL recordingIsAvailable;

@property (nonatomic, readonly) BOOL playerIsPlaying;

@property (nonatomic, readonly) BOOL sequencerIsPlaying;

@property (nonatomic) float sequencerCurrentPosition;

@property (nonatomic) float sequencerPlaybackRate;

@property (nonatomic) float playerVolume;           //  0.0 - 1.0

@property (nonatomic) float playerPan;              // -1.0 - 1.0

@property (nonatomic) float samplerDirectVolume;  // 0.0 - 1.0

@property (nonatomic) float samplerEffectVolume;  // 0.0 - 1.0

@property (nonatomic) float distortionWetDryMix;    // 0.0 - 1.0

@property (nonatomic) NSInteger distortionPreset;

@property (nonatomic) float reverbWetDryMix;        // 0.0 - 1.0

@property (nonatomic) NSInteger reverbPreset;

@property (nonatomic) float outputVolume;           // 0.0 - 1.0

@property (weak) id<AudioEngineDelegate> delegate;

- (void)toggleSequencer;

- (void)togglePlayer;

- (void)toggleBuffer:(BOOL)recordBuffer;

- (void)startRecordingMixerOutput;

- (void)stopRecordingMixerOutput;

@end