I have to admit that the surround60/surround61 [FL+FR+RL+RR(+LFE)+SL+SR] I mentioned probably never existed. And it SEEMS that surround21 is particularly needed by some laptops with LFE speaker. On 16 January 2016 at 22:24, Tom Yan <tom.ty89@xxxxxxxxx> wrote: > By the way, > > [tom@localhost ~]$ diff <(grep surround41.conf > /usr/share/alsa/cards/*.conf | cut -d ":" -f 1) <(grep surround50.conf > /usr/share/alsa/cards/*.conf | cut -d ":" -f 1) > [tom@localhost ~]$ diff <(grep surround41.conf > /usr/share/alsa/cards/*.conf | cut -d ":" -f 1) <(grep surround21.conf > /usr/share/alsa/cards/*.conf | cut -d ":" -f 1) > 12d11 > < /usr/share/alsa/cards/Echo_Echo3G.conf > [tom@localhost ~]$ > > On 16 January 2016 at 22:09, Tom Yan <tom.ty89@xxxxxxxxx> wrote: >> What I mean is, should we really by default set up PCMs that provide a >> SUBSET of POSSIBLE channel configurations that IS BUILT and RELYS ON >> ttable? >> >> [tom@localhost ~]$ grep ttable /usr/share/alsa/pcm/surround* >> /usr/share/alsa/pcm/surround21.conf: ttable.0.FL 1 >> /usr/share/alsa/pcm/surround21.conf: ttable.1.FR 1 >> /usr/share/alsa/pcm/surround21.conf: ttable.2.LFE 1 >> /usr/share/alsa/pcm/surround41.conf: ttable.0.FL 1 >> /usr/share/alsa/pcm/surround41.conf: ttable.1.FR 1 >> /usr/share/alsa/pcm/surround41.conf: ttable.2.RL 1 >> /usr/share/alsa/pcm/surround41.conf: ttable.3.RR 1 >> /usr/share/alsa/pcm/surround41.conf: ttable.4.LFE 1 >> /usr/share/alsa/pcm/surround50.conf: ttable.0.FL 1 >> /usr/share/alsa/pcm/surround50.conf: ttable.1.FR 1 >> /usr/share/alsa/pcm/surround50.conf: ttable.2.RL 1 >> /usr/share/alsa/pcm/surround50.conf: ttable.3.RR 1 >> /usr/share/alsa/pcm/surround50.conf: ttable.4.FC 1 >> >> If we are really gonna provide them, why only these 3? What about: >> surround30 (surround51 - RL - RR - LFE) >> surround31 (surround51 - RL - RR) >> surround60 (surround71 - FC - LFE, corresponds to surround40) >> surround61 (surround71 - FC, corresponds to surround41) >> surround70 (surround71 - LFE, corresponds to surround 50) >> >> surround30 more or less corresponds to surround50 as well, and >> surround31 doesn't even have the weirdness of using only either one >> channel in the C/Sub port like the others. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
