commit 2ae1f68a2a28b819668009d2b8d445f1870e79b3
author Andy Hung <hunga@google.com> Thu Sep 09 15:35:44 2021 -0700
committer Andy Hung <hunga@google.com> Fri Sep 10 10:03:30 2021 -0700
tree 5e69773e3479e20bd214a19e0d1e4b338557f44c
parent 20c059dd4cd9a74bd9210e8fbdeeaca60d27aba6

audio_utils: Update ChannelMix for full 22.2 matrix

Update to use a full 22.2 downmix matrix, where
coefficients beyond 7.1 are based on
ARIB STD-B32 22.2 Downmix Coefficients.

See:

Downmixing Method for 22.2 Multichannel Sound Signal in
8K Super Hi-Vision Broadcasting,
Takehiro Sugimoto, Satoshi Oode, and Yasushige Nakayama,
Journal of the Audio Engineering Society ENGINEERING REPORTS
Vol. 63, No. 7/8, July/August 2015, p 590 - 599.

Test: atest channelmix_benchmark
Test: atest channelmix_tests
Bug: 188502620
Bug: 189336830
Change-Id: Ic5a057d828d2344164a7c6e8e1bccac6e8f3eee4