On Wed, 2020-10-28 at 09:59 +0800, Chengyi Zhao wrote: > Hi guys, > > I have a computer with using Realtek ALC662 rev3, it can adapt the > multichannel profile below, > > but I can't find multichannel-input and multichannel-output paths in > path folder > > (/usr/share/pulseaudio/alsa-mixer/paths), please tell me the working > logic of > > multi-channel profile, and how it differs from other profiles, thanks! > > ------------------------------------------------ > > [Mapping multichannel-output] > device-strings = hw:%f > channel-map = left,right,rear-left,rear-right > exact-channels = false > fallback = yes > priority = 1 > direction = output > paths-output = multichannel-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 > paths-input = multichannel-input > > ------------------------------------------------ The profile-set configuration indeed references non-existent paths. The "paths-output" and "paths-input" options should be removed from these mappings. The multichannel mappings are tried when nothing else works (hence "fallback = yes"), and the purpose of these mappings is to have some kind of support for sound cards that can only be opened with 4 channels or more, and don't define the standard "surround" alsa device names. The "exact-channels = false" option means that if the sound card requires using more than 4 channels, PulseAudio will open the device with as many channels as necessary, but will only use the first 4 channels as defined with the "channel-map" option. The rest of the channels get assigned "aux" positions, which are not routed to unless an application uses the aux channels its own channel map (which virtually no application does). -- Tanu https://www.patreon.com/tanuk https://liberapay.com/tanuk _______________________________________________ pulseaudio-discuss mailing list pulseaudio-discuss@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss
