iPhoneMultichannelMixerTest |
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DESCRIPTION: |
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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. |
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All the relevant code is in the file MultichannelMixerController.mm while the supporting UI code is in MyViewController.m |
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Touching the "Play Audio" button simply calls AUGraphStart while "Stop Audio" calls AUGraphStop. Changing AU volume is |
performed via AudioUnitSetParameter. |
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Audio data is provided from two single channel audio files. Each single channel of data |
(a guitar riff and drum groove respectively) is rendered to a single channel of each input bus resulting in the guitar |
on the left channel and the drums on the right channel at the output. This serves no specific purpose other than making |
for an obvious sample where you can turn off and change the volume of each input and be very aware of the results. |
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RELATED INFORMATION: |
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Audio Session Programming Guide |
Core Audio Overview |
Audio Unit Processing Graph Services Reference |
Output Audio Unit Services Reference |
System Audio Unit Access Guide |
Audio Component Services Reference |
Audio File Services Reference |
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AudioToolbox/AUGraph.h |
AudioToolbox/ExtendedAudioFile.h |
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SPECIAL CONSIDERATIONS: |
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None |
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BUILD REQUIREMENTS: |
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iOS 6.1 SDK |
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RUNTIME REQUIREMENTS: |
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iPhone OS 6.1 or later |
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PACKAGING LIST: |
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MultichannelMixerTestDelegate.h |
MultichannelMixerTestDelegate.m |
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The MultichannelMixerTestDelegate class defines the application delegate object, responsible for adding the navigation |
controllers view to the application window, setting up the Audio Session and so on. |
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MyViewController.h |
MyViewController.m |
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The MyViewController class defines the controller object for the application. The object helps set up the user interface, |
responds to and manages user interaction, and communicates with the MultichannelMixerController. |
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MultichannelMixerController.h |
MultichannelMixerController.mm |
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This file implements setting up the AUGraph, loading up the audio data using ExtAudioFile, the input render procedure and so on. |
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All the code demonstrating interacting with Core Audio is in this one file, the rest of the sample can be thought of as a simple |
framework for the demonstration code in this file. |
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CHANGES FROM PREVIOUS VERSIONS: |
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Version 1.0, tested with iPhone OS 3.0. First public release. |
Version 1.1, upgraded project to build with the iOS 4 SDK. |
Version 1.1.1, upgraded project to build with the iOS 6.1 SDK. Migrated to AVAudioSession from AudioSession APIs. |
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Copyright (C) 2009-2013 Apple Inc. All rights reserved. |
