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Apple Developer Documentation
https://developer.apple.com/documentation/audiotoolbox/1502718-audiofilegetproperty
Discussion. Some Core Audio property values are C types and others are Core Foundation objects. If you call this function to retrieve a value that is a Core Foundation object, then this function—despite the use of “Get” in its name—duplicates the object.
Apple Developer Documentation
https://developer.apple.com/documentation/audiotoolbox/1501691-audiofilegetpropertyinfo
Gets information about an audio file property, including the size of the property value and whether the value is writable.
iphone - Extracting MP3 Album artwork in iOS - Stack …
https://stackoverflow.com/questions/16318821/extracting-mp3-album-artwork-in-ios
This returned everything except album art. When I tried to extract the album art using kAudioFilePropertyAlbumArtwork, I got osstatus error(The operation couldn't be completed). So at last, I tried my luck with ObjC wrapper for libId3(found here). It worked perfectly well. I could get the artwork. My question is, why AVAsset could not retrieve ...
Apple Developer Documentation
https://developer.apple.com/documentation/audiotoolbox/audio_file_services
This document describes Audio File Services, a C programming interface that enables you to read or write a wide variety of audio data to or from disk or a memory buffer. With Audio File Services you can: Create, initialize, open, and close audio files. Read and write audio files. Optimize audio files. Work with user data and global information.
Apple Developer Documentation
https://developer.apple.com/documentation/audiotoolbox/audio_file_services/1576499-audio_file_properties
To support formats such as AAC SBR in which an encoded data stream can be decoded to multiple destination formats, this property’s value is an array of audio format list item values (declared in Audio Format.h) of those formats.Typically, this is an audio format list item with the same audio stream basic description in the k Audio File Property Data Format property.
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