add iPhoneMultichannelMixerTest

Author: Darcy Liu

README.md

@@ -1148,4 +1148,12 @@ This sample explores two approaches to parsing XML, focusing on performance with
 
 [URL](https://developer.apple.com/library/ios/#samplecode/XMLPerformance/Introduction/Intro.html#//apple_ref/doc/uid/DTS40008094)
 
-Last Revision:	Version 1.3, 2010-07-08
+Last Revision:	Version 1.3, 2010-07-08
+
+#iPhoneMultichannelMixerTest#
+
+Demonstrates how to build an Audio Unit Graph connecting a Multichannel Mixer instance to the RemoteIO unit. Two input busses are created each with input volume controls. An overall mixer output volume control is also provided and each bus may be enabled or disabled.
+
+[URL](https://developer.apple.com/library/ios/#samplecode/iPhoneMultichannelMixerTest/Introduction/Intro.html#//apple_ref/doc/uid/DTS40009113)
+
+Last Revision:	Version 1.1, 2010-07-07

iPhoneMultichannelMixerTest.zip

@@ -0,0 +1,86 @@
+/*
+     File: MultichannelMixerController.h 
+ Abstract: The Controller Class for the AUGraph. 
+  Version: 1.1 
+  
+ Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple 
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+  
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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 
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+  
+ Copyright (C) 2010 Apple Inc. All Rights Reserved. 
+  
+*/
+
+#import <AudioToolbox/AudioToolbox.h>
+#import <AudioUnit/AudioUnit.h>
+
+#import "CAStreamBasicDescription.h"
+
+#define MAXBUFS  2
+#define NUMFILES 2
+
+typedef struct {
+    AudioStreamBasicDescription asbd;
+    AudioUnitSampleType *data;
+	UInt32 numFrames;
+	UInt32 sampleNum;
+} SoundBuffer, *SoundBufferPtr;
+
+@interface MultichannelMixerController : NSObject
+{
+    CFURLRef sourceURL[2];
+    
+	AUGraph   mGraph;
+	AudioUnit mMixer;
+    
+    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