/*

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

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 The MixerViewController class provides specific UI Elements to interact with the AVAudioEngine mainMixerNode object.

                 CAUITransportButton *recordButton;          Installs a tap on the output bus for the mixer and records to a file

                 UISlider            *masterVolumeSlider;    Sets the output volume of the mixer

*/

#import "MixerViewController.h"

#import "CAUITransportButton.h"

@interface MixerViewController ()

@property (unsafe_unretained, nonatomic) IBOutlet CAUITransportButton *recordButton;

@property (unsafe_unretained, nonatomic) IBOutlet UISlider *masterVolumeSlider;

@property (getter=isRecording) BOOL recording;

@end

@implementation MixerViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view.

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

- (void)updateUIElements

{

    self.masterVolumeSlider.value   = self.audioEngine.outputVolume;

    self.recordButton.drawingStyle = recordButtonStyle;

    self.recordButton.fillColor = [UIColor colorWithRed:255/255.0 green:102/255.0 blue:102/255.0 alpha:1].CGColor;

}

- (IBAction)setMasterVolume:(id)sender {

    self.audioEngine.outputVolume = ((UISlider *)sender).value;

}

- (IBAction)recordAction:(id)sender {

    self.recording = !self.recording;

    if (self.recording)

        [self.audioEngine startRecordingMixerOutput];

    else

        [self.audioEngine stopRecordingMixerOutput];

    self.recordButton.drawingStyle = self.recording ? recordEnabledButtonStyle : recordButtonStyle;

}

@end