iPhoneExtAudioFileConvertTest |
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DESCRIPTION: |
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iPhoneExtAudioFileConvertTest demonstrates the use of the ExtAudioFile API to convert from one audio format and file type to another. |
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All the relevant code is in the file ExtAudioFileConvert.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 |
Extended Audio File 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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iOS 7.0 SDK |
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RUNTIME REQUIREMENTS: |
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iOS 5.1 or later |
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PACKAGING LIST: |
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iPhoneExtAudioFileConvertTest.h |
iPhoneExtAudioFileConvertTest.m |
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The ExtAudioFileConvertAppDelegate 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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ExtAudioFileConvert.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 3.1. First public release. |
Version 1.1, tested with iPhone OS 4.0. Upgraded project to build with the iOS 4.0 SDK. |
Version 1.2, tested with iPhone OS 6.1. Upgraded project to build with the iOS 6.1 SDK. |
Version 1.2.1, updated to support iPhone 5s and software AAC encode with iOS 7. |
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Copyright (C) 2009-2014 Apple Inc. All rights reserved. |
