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The Audio Unit - Apple Developer
https://developer.apple.com/library/archive/documentation/MusicAudio/Conceptual/AudioUnitProgrammingGuide/TheAudioUnit/TheAudioUnit.html
An audio buffer can hold a single channel, or multiple interleaved channels. However, most types of audio units, including effect units, use only noninterleaved data. These audio units expect the mNumberChannels field in …
ios - Audio Unit recording: increased volume of buffers ...
https://stackoverflow.com/questions/11573796/audio-unit-recording-increased-volume-of-buffers
The buffer is originally linear 16-bit, which i convert to float for the audio analysis phase. However, in the end I write the original, uncoverted AudioBufferList as this was the approach that worked. However, I think I now need to return an adjusted version of the buffer back into an AudioBufferList so it can be written with that function.
Using Audio - Apple Developer
https://developer.apple.com/library/archive/documentation/AudioVideo/Conceptual/MultimediaPG/UsingAudio/UsingAudio.html
iOS provides a set of audio processing plug-ins, known as audio units, that you can use in any application. The interfaces in the Audio Unit framework let you open, connect, and use these audio units. To use the features of the Audio Unit framework, add the Audio Toolbox framework to your Xcode project and link against it in any relevant targets.
core audio - How to use iOS AudioUnit render callback ...
https://stackoverflow.com/questions/8259944/how-to-use-ios-audiounit-render-callback-correctly
An alternative built into iOS is to use the Audio Queue API, which does the pre-buffering for you. It allows your app to fill a number of larger audio buffers in the main run loop ahead of time. You still have to pre-buffer enough data to …
Recording Audio on iOS with Examples - Dolby.io
https://dolby.io/blog/recording-audio-on-ios-with-examples/
AVAudioEngine is a wrapper of the Audio Unit, a low-level software audio module in iOS/macOS. It provides a framework to manage the starting of an audio capture/recording or playback. It is highly recommended by Apple. You dynamically create an audio graph and processing chain. You then use TAP to get a peek of the audio buffer and can analyze them.
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