iPhoneACFileConvertTest |
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DESCRIPTION: |
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iPhoneACFileConvertTest demonstrates the use of the Audio Converter APIs to convert from a PCM audio format to a compressed format. |
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All the relevant code is in the file AudioConverterFileConvert.cpp. |
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Touching the "Convert" button calls the function DoConvertFile() producing an output.caf file using the |
encoding and sample rate chosen in the UI. The output.caf file is then played back after conversion using AVAudioPlayer |
to confirm success. |
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Audio format information for the source file and output file are also displayed. |
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Interruption handling during audio processing (conversion) is also demonstrated. |
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RELATED INFORMATION: |
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Core Audio Overview |
Audio Session Programming Guide |
Audio Converter Services Reference |
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SPECIAL CONSIDERATIONS: |
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AAC encoding using the Audio Converter requires iOS 4.1 and a hardware capable device such |
as the iPhone 3GS or newer. |
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IPhone 5s does not have a hardware encoder and only one encoder will show up. |
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BUILD REQUIREMENTS: |
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Mac OS X v10.9.x Xcode 5.0.2+, iOS 7.0.4 |
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RUNTIME REQUIREMENTS: |
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Simulator: Mac OS X v10.9.x |
iPhone: iOS 7.0.4 |
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PACKAGING LIST: |
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iPhoneACFileConvertTest.h |
iPhoneACFileConvertTest.m |
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The ACFileConvertAppDelegate class defines the application delegate object, responsible for adding the navigation |
controllers view to the application window. |
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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 implements sound playback. |
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AudioConverterFileConvert.cpp |
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This file implements the DoConvertFile function which is called on a background thread from the MyViewController class. |
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All the code demonstrating how to perform conversion is contained in this one file, the rest of the sample may be thought of |
as a simple framework for the demonstration code in this file. |
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Audio Format and Sample Rate choices presented in the UI are simply used for testing purposes, developers are free to choose any other |
supported file type or encoding format and present these choices however they wish. |
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CHANGES FROM PREVIOUS VERSIONS: |
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Version 1.0, tested with iPhone OS 4.1 First public release. |
Version 1.0.2, tested with iOS 6.1 Minor Update for 6.1 SDK. |
Version 1.0.3, updated to support iPhone 5s and software AAC encode with iOS 7. |
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Copyright (C) 2010-2014 Apple Inc. All rights reserved. |
