So, in order to support 2.1 surround on both 4-channels (e g FL FR LFE LFE, on internal subwoofer) and 6-channels (e g FL FR RL RR C LFE, on desktops with 5.1 out), I needed to make the route plugin more chmap aware.
This also included allowing a new syntax for the ttable, which I think is quite nice. The new syntax also falls back to ALSAs standard chmap in case the hardware does not support it.
David Henningsson (3): route: Allow chmap syntax for slave channels in ttable route: Select slave chmap based on ttable information conf: Allow 2.1 surround to use different number of channels
src/conf/pcm/surround21.conf | 7 +- src/pcm/pcm_route.c | 304 ++++++++++++++++++++++++++++++++++++++----- 2 files changed, 271 insertions(+), 40 deletions(-)