GStreamer 1.16 brought support for planar (non-interleaved) raw audio. Let's use that to simplify the "1 appsrc per channel + audiointerleave" approach to a single appsrc with non-interleaved layout. We do not need to keep the appsrcs and mapped buffers per channel around which lets us drop a bunch of code. This approach cuts the overhead the GStreamer pipeline causes on the WPEWebProcess in half on an NXP i.MX 6 DualLite.
Pull request: https://github.com/WebKit/WebKit/pull/6350
Committed 256648@main (63076adef16d): <https://commits.webkit.org/256648@main> Reviewed commits have been landed. Closing PR #6350 and removing active labels.
<rdar://problem/102315904>