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AudioViews/AQLevelMeter.h

/*

    File: AQLevelMeter.h

Abstract: Class for handling and displaying AudioQueue meter data

 Version: 2.5

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*/

#import <UIKit/UIKit.h>

#import <AudioToolbox/AudioQueue.h>

#include "MeterTable.h"

#import "CAXException.h"

#define kPeakFalloffPerSec  .7

#define kLevelFalloffPerSec .8

#define kMinDBvalue -80.0

// A LevelMeter subclass which is used specifically for AudioQueue objects

@interface AQLevelMeter : UIView {

    AudioQueueRef               _aq;

    AudioQueueLevelMeterState   *_chan_lvls;

    NSArray                     *_channelNumbers;

    NSArray                     *_subLevelMeters;

    MeterTable                  *_meterTable;

    NSTimer                     *_updateTimer;

    CGFloat                     _refreshHz;

    BOOL                        _showsPeaks;

    BOOL                        _vertical;

    BOOL                        _useGL;

    UIColor                     *_bgColor, *_borderColor;

    CFAbsoluteTime              _peakFalloffLastFire;

@property               AudioQueueRef aq; // The AudioQueue object

@property               CGFloat refreshHz; // How many times per second to redraw

@property (retain)      NSArray *channelNumbers; // Array of NSNumber objects: The indices of the channels to display in this meter

@property               BOOL showsPeaks; // Whether or not we show peak levels

@property               BOOL vertical; // Whether the view is oriented V or H

@property               BOOL useGL; // Whether or not to use OpenGL for drawing

-(void)setBorderColor: (UIColor *)borderColor;

-(void)setBackgroundColor: (UIColor *)backgroundColor;

@end

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