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Apple Developer Documentation
https://developer.apple.com/documentation/audiotoolbox/1440371-audiounitsetproperty
The audio unit that you want to set a property value for. inID The audio unit property identifier. inScope The audio unit scope for the property. inElement The audio unit element for the property. inData The value that you want to apply to the property. May be NULL (see Discussion). Always pass property values by reference.
Setting up audio unit iOS with mono input and stereo ...
https://stackoverflow.com/questions/23070442/setting-up-audio-unit-ios-with-mono-input-and-stereo-output
kAudioFormatFlagsAudioUnitCanonical is 32-bit 8.24 fixed point format. That means mBytesPerFrame should be 4 for mono and 8 for stereo, and mBitsPerChannel should be 32 for both stereo and mono. Setting it to 16-bits for would probably produce this error. That said, I doubt you want 8.24.
Audio Unit详解 - 简书 - jianshu.com
https://www.jianshu.com/p/8ce865c9bbac
七、AudioUnitSetProperty配置audio unit. AudioUnitProperty是一个键值对。以下是audio unit开发中常用的一些属性： kAudioOutputUnitProperty_EnableIO：用于在I/O unit上启用和禁用input or output。默认情况输出已启用，输入已禁用 kAudioUnitProperty_ElementCount：用于配置mixer unit上输入elements的 ...
Device input using the HAL Output Audio Unit - Apple …
https://developer.apple.com/library/archive/technotes/tn2091/_index.html
The AUHAL is an Audio Unit that can receive and send audio data to an audio device. To receive audio from the AUHAL, you must get it from the output scope of the Audio Unit. In practice, this is done by a client calling AudioUnitRender. To give audio to the AUHAL, you must give it data on the input scope.
iOS: How to resample audio(PCM data) using Audio Unit at ...
https://www.py4u.net/discuss/75267
kOutputBus 0 kInputBus 1 AUDIO_SAMPLE_RATE 44100 AUDIO_FRAMES_PER_PACKET 1 AUDIO_CHANNELS_PER_FRAME 1 AUDIO_BITS_PER_CHANNEL 16 AUDIO_BYTES_PER_PACKET 2 AUDIO_BYTES_PER_FRAME 2 I am receiving the PCM data from recording callback as . audioBufferList->mBuffers [0].mData. SO, how can i resample this PCM data from 44.1KHz to …
Audio APIs, Part 1: Core Audio / macOS - Bastibe.de
https://bastibe.de/2017-06-17-audio-apis-coreaudio.html
The next step is then to configure the audio unit using AudioUnitGetPropertyand AudioUnitSetProperty. This is surprisingly hard, since every property can be configured for every bus (sometimes called element) of every input or output of every unit, and the documentation is extremely terse on which of these combinations are valid.
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