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As i understand it, an audio unit can have several inputs and several outputs, and an 'element' is just an index of one of those. (https://developer.apple.com/library/archive/documentation/MusicAudio/Conceptual/AudioUnitProgrammingGuide/TheAudioUnit/TheAudioUnit.html). Therefore, it's should be possible, for example, to have several render callbacks for a single audio unit. An example would be a crossfade unit with 2 inputs: it'll have 2 elements in its input scope and 1 in output scope, and it'll require either two render callbacks (one for each input), or two upstream audio units. This changes Element to be just a number and adds explicit element parameter to all the places where it hasn't been present before (i.e. setting callbacks and input/output stream formats). I also had to change handling of render callbacks a bit, since there can now be more than one of them for a single audio unit. This relates to the issue RustAudio#60 and PR RustAudio#47.
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What's stopping this one (apart from rebasing probably)? |
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As i understand it, an audio unit can have several inputs and several outputs,
and an 'element' is just an index of one of those (https://developer.apple.com/library/archive/documentation/MusicAudio/Conceptual/AudioUnitProgrammingGuide/TheAudioUnit/TheAudioUnit.html).
Therefore, it's should be possible, for example, to have several render callbacks for a single audio unit.
An example would be a crossfade unit with 2 inputs: it'll have 2 elements in its input scope
and 1 in output scope, and it'll require either two render callbacks (one for each input),
or two upstream audio units.
This changes Element to be just a number and adds an explicit element parameter to all the places
where it hasn't been present before (i.e. setting callbacks and input/output stream formats).
I also had to change handling of render callbacks a bit, since there can now be more than one of them for a single audio unit.
This relates to the issue #60 and PR #47.