audio-channel-mixer: Doesn't handle all channel positions when mixing
@slomo
Submitted by Sebastian Dröge Link to original bug (#666506)
Description
Currently audioconvert doesn't handle all channel positions when mixing different layouts but claims to do so... it simply ignores channels not known to it.
This should be fixed by implementing conversions from/to all layouts by calculating for every position the influence of all other positions to it (using geometry) and creating a mixing matrix for this.