[pulseaudio-tickets] [Bug 91470] New: Add keyword to disable channels in profile mappings of multi-channel devices

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91470

            Bug ID: 91470
           Summary: Add keyword to disable channels in profile mappings of
                    multi-channel devices
           Product: PulseAudio
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: medium
         Component: core
          Assignee: pulseaudio-bugs at lists.freedesktop.org
          Reporter: rene at bartschnet.de
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net

Currently the only way to separate channels of multi-channel devices is
module-remap-{source|sink} which is complex to configure and tends to block the
operation of Pulseaudio when devices are missing/not connected. It's not
possible to publish device-specific profiles using module-remap-{source|sink}.

In profile-mappings it's possible to disable audio-routing by naming channels
of a channel-map "aux[0-15]". But the source/sink is still handled as
multi-channel device with e.g. 10 channels. Consider an audio-device with 10
output-channels and you want to use only 2 channels...

A channel-map would look like
channel-map = left, right, aux2, aux3, aux4, aux5, aux6, aux7, aux8, aux9

PAVUControl doesn't list 2 channels, but 10!


Please add a new keyword - like "none" - to disable a channel completely and to
decrease the channel count.

Example:

[Mapping Stereo1]
channel-map = left, right, none, none, none, none, none, none, none, none

[Mapping Stereo2]
channel-map = none, none, left, right, none, none, none, none, none, none

[Mapping Stereo3]
channel-map = none, none, none, none, left, right, none, none, none, none

[Mapping Stereo4]
channel-map = none, none, none, none, none, none, left, right, none, none

[Mapping Stereo5]
channel-map = none, none, none, none, none, none, none, none, left, right

would allow to use one multi-channel sink with 10 channels as 5 stereo sinks.

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