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AQLevelMeter.h

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+/*
+ 
+    File: AQLevelMeter.h
+Abstract: Class for handling and displaying AudioQueue meter data
+ Version: 2.2
+
+Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple
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+
+In consideration of your agreement to abide by the following terms, and
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+expressly stated in this notice, no other rights or licenses, express or
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+
+The Apple Software is provided by Apple on an "AS IS" basis.  APPLE
+MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
+THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
+FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
+OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
+
+IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
+OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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+Copyright (C) 2009 Apple Inc. All Rights Reserved.
+
+ 
+*/
+
+
+
+#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