/*

    Copyright (C) 2015 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    The Controller Class for the AUGraph.

*/

#import <AudioToolbox/AudioToolbox.h>

#import <AudioUnit/AudioUnit.h>

#import <AVFoundation/AVAudioFormat.h>

#import "CAComponentDescription.h"

#define MAXBUFS  2

#define NUMFILES 2

typedef struct {

    AudioStreamBasicDescription asbd;

    Float32 *data;

    UInt32 numFrames;

    UInt32 sampleNum;

} SoundBuffer, *SoundBufferPtr;

@interface MultichannelMixerController : NSObject

{

    CFURLRef sourceURL[2];

    AVAudioFormat *mAudioFormat;

    AUGraph   mGraph;

    AudioUnit mMixer;

    AudioUnit mOutput;

    SoundBuffer mSoundBuffer[MAXBUFS];

    Boolean isPlaying;

}

@property (readonly, nonatomic) Boolean isPlaying;

- (void)initializeAUGraph;

- (void)enableInput:(UInt32)inputNum isOn:(AudioUnitParameterValue)isONValue;

- (void)setInputVolume:(UInt32)inputNum value:(AudioUnitParameterValue)value;

- (void)setOutputVolume:(AudioUnitParameterValue)value;

- (void)startAUGraph;

- (void)stopAUGraph;

@end