On Fri, 2021-04-02 at 17:49 +0800, Chengyi Zhao wrote: > Hi guys, > > I don't know why we should set multichannel-input and > multichannel-output to fallback map > in the configuration file default.conf. > > I think these have no actual usage scenarios, we should delete these > configurations. > > Do you agree with me？ > > ---------------- > ./src/modules/alsa/mixer/profile-sets/default.conf： > > -[Mapping multichannel-output] > -device-strings = hw:%f > -channel-map = left,right,rear-left,rear-right > -exact-channels = false > -fallback = yes > -priority = 1 > -direction = output > - > -[Mapping multichannel-input] > -device-strings = hw:%f > -channel-map = left,right,rear-left,rear-right > -exact-channels = false > -fallback = yes > -priority = 1 > -direction = input > -
These are used with sound cards that can't be opened with the regular mappings. Some pro audio cards can have e.g. 12 channels and refuse to be opened with any less channels. The "exact-channels" option is set to false with the multichannel mappings, which means that no matter how many channels the card requires, these mappings successfully open the device. -- Tanu _______________________________________________ pulseaudio-discuss mailing list pulseaudio-discuss@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss
