requested to merge igor.v.kovalenko/pulseaudio:pr/bluetooth-sbc-xq-with-bitrate-cap into master
There are multiple definitions of SBC XQ, but in all cases this is SBC codec in Dual Channel mode, 8 bands, block length 16, allocation method Loudness, with bitpool adjusted to match target bitrates.
Most commonly chosen bitrates and reasons are:
Efficient packing considerations do not apply on Linux (yet?) but still we can gain from increased bitrate.
Desired SBC bitpool value is calculated from target bitrate limit; calculation could be open-coded if needed, no call to sbc library is actually required as bitrate formula is known from A2DP spec.
Issue ref #1092 (closed)