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macos: Add Apple AAC encoder element

Piotr Brzeziński requested to merge thewildtree/gstreamer:audiotoolbox-atenc-aac into main

Requires !6223 (merged) and !6320 (merged)

Adds atenc, currently supporting AAC-LC audio at up to 7.1. CBR/VBR are supported and come with necessary knobs for control (bitrate/quality).

Adding LD, HE-AAC and HE-AAC-v2 should be relatively simple in the future, the problem from my testing is that for those formats the AudioSpecificConfig is a bit different and parsing fails, which sometimes causes no output or wrong channel configurations. So leaving AAC-LC only for now.

Edited by Piotr Brzeziński

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