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core audio - How to use iOS AudioUnit render callback ...
https://stackoverflow.com/questions/8259944/how-to-use-ios-audiounit-render-callback-correctly
Using the RemoteIO Audio Unit might require having a separate data queue (fifo or circular buffer), outside the audio unit callback, which can pre-buffer up enough audio data from a file read, ahead of audio unit render callback, to meet worse case latencies. Then the render callback only needs to do a quick copy of the audio data, and then the ...
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 ...
The Audio Unit - Apple Developer
https://developer.apple.com/library/archive/documentation/MusicAudio/Conceptual/AudioUnitProgrammingGuide/TheAudioUnit/TheAudioUnit.html
Like the render callback, the AudioUnitRender function is declared in the AUComponent.h header file in the Audio Unit framework. Audio Unit Channels An audio unit channel is, conceptually, a monaural, noninterleaved path for audio data samples that goes to or from an audio unit’s processing code.
Apple Developer Documentation
https://developer.apple.com/documentation/audiotoolbox/aurendercallback
Discussion. If you named your callback function My AURender Callback, you would declare it like this:. Discussion. You can use this callback function with both the audio unit render notification API (see the Audio Unit Add Render Notify(_: _: _:) function) and the render input callback (see the k Audio Unit Property _Set Render Callback property).. As a notification listener, the system ...
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.
iOS AudioUnit - what determines render callback timing ...
https://www.reddit.com/r/iOSProgramming/comments/s8xt9b/ios_audiounit_what_determines_render_callback/
iOS AudioUnit - what determines render callback timing? Hello, all ... I'm having a weird issue with an audio unit we have in our iOS app. We feed it samples from an external BLE device after doing some DSP on them via a circular buffer and expect the audio unit to play them back at 8khz. This works well, and the sample input rate is set by the ...
Technical Note TN2091: Device input using the HAL Output ...
https://developer.apple.com/library/archive/technotes/tn2091/_index.html
To give audio to the AUHAL, you must give it data on the input scope. This is done by providing an input callback to the Audio Unit. In our example, we will call AudioUnitRender from within the input proc. The input proc's render action flags, time stamp, bus number and number of frames requested should be propagated down to the AudioUnitRender ...
AudioUnit render callback - Google Search
https://groups.google.com/g/zengarden/c/7m063wC3tqI
for RemoteIO rendering callback which sadly doesn't produce nice sine wave from simple_osc.pd but this awful sawtooth like sound. I suspect that is somehow related to the buffer sizes because when I change the blockSize, sound changes. Mind that I'm just starting with audio programming:). Here is the code.
How to write output of AUGraph to a file?
https://www.py4u.net/discuss/1090557
Doing an kAudioUnitProperty_MakeConnection from the output of audio unit A to the input of audio unit B is the same as doing kAudioUnitProperty_SetRenderCallback on the input of unit B and having the callback function call AudioUnitRender on the output of audio unit A.
Decibel metering from an iPhone audio unit | Politepix
https://www.politepix.com/2010/06/18/decibel-metering-from-an-iphone-audio-unit/
Hello visitor! If Core Audio and iOS development is your cup of tea, you might also want to check out OpenEars, Politepix’s shared source library for continuous speech recognition and text-to-speech for iPhone and iPad development.It even has an API for defining rules-based recognition grammars dynamically as of version 1.7 – pretty neat! On to decibel metering:
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