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Apple Developer Documentation
https://developer.apple.com/documentation/audiotoolbox/1438430-audiounitrender
ioData. On input, the audio buffer list that the audio unit is to render into. On output, the audio data that was rendered by the audio unit. The AudioBufferList that you provide on input must match the topology for the current audio format for the given bus. The buffer list can be either of these two variants: If the mData pointers are non ...
Apple Developer Documentation
https://developer.apple.com/documentation/audiotoolbox/audiounitrenderactionflags
static var unitRenderAction_OutputIsSilence: AudioUnitRenderActionFlags. This flag can be set in a render input callback (or in the audio unit's render operation itself) and is used to indicate that the render buffer contains only silence. It can then be used by the caller as a hint to whether the buffer needs to be processed or not.
Apple Developer Documentation
https://developer.apple.com/documentation/audiotoolbox/1440259-audiounitaddrendernotify
Discussion. The registered callback function is called both before the audio unit performs its render operations (when the render flag’s pre-render bit is set) and after the audio unit has completed its render operation (the render flag’s post-render bit is set).
Apple Developer Documentation
https://developer.apple.com/documentation/audiotoolbox/audiounitrenderactionflags/kaudiounitrenderaction_outputissilence
This flag can be set in a render input callback (or in the audio unit's render operation itself) and is used to indicate that the render buffer contains only silence.
ios - AudioUnitRender got error kAudioUnitErr ...
https://stackoverflow.com/questions/41824058/audiounitrender-got-error-kaudiouniterr-cannotdoincurrentcontext-10863
What I did is calling AudioUnitRender in AURenderCallback func so that the audio data is writed to AudioBuffer structure. It works well if the "IO buffer duration" is not set or set to 0.020seconds. If the "IO buffer duration" is set to a small value (0.005 etc.) by calling setPreferredIOBufferDuration, AudioUnitRender() will return an error:
Apple Developer Documentation
https://developer.apple.com/documentation/audiotoolbox/auaudiounit/1387620-allocaterenderresourcesandreturn
The maximum number of frames that the audio unit can render at once. - token By Adding Render Observer:
Audio Unit详解 - 简书
https://www.jianshu.com/p/8ce865c9bbac
3.1 Effect Unit iOS4提供了一个effect unit，即iPod Equalizer，与内置iPod应用程序使用的均衡器相同。要查看该audio unit的iPod应用程序用户界面，请转至Setting> iPod> EQ。
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