[pulseaudio-tickets] [Bug 42137] New: Edirol/Roland M-16DX not detected properly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=42137

             Bug #: 42137
           Summary: Edirol/Roland M-16DX not detected properly
    Classification: Unclassified
           Product: PulseAudio
           Version: unspecified
          Platform: All
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: alsa
        AssignedTo: pulseaudio-bugs at lists.freedesktop.org
        ReportedBy: ljkarkk2 at cc.hut.fi
         QAContact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net


3 [M16DX          ]: USB-Audio - M-16DX
                      EDIROL M-16DX at usb-0000:02:00.0-2, high speed

M-16DX is a studio mixer / capture device with 18-channel capture and 2-channel
playback. Pulseaudio does not detect any capture functionality, probably due to
the high channel count. For playback, separate analog and SPDIF outputs are
detected by Pulseaudio (probably because ALSA exposes a iec958 device) but as
far as I know, M-16DX is unable to do SPDIF pass-through. Also, playback is
broken due to a known ALSA bug that is unlikely to get fixed.

I suggest detecting the device for capture only, using 18 channels as it
doesn't support any less. The only sample format supported is S32_LE. The
sample rate is configured on the hardware and cannot be changed by the host
(44.1/48/96 kHz).

The capture channels should be labeled as follows:
Mono 1 (Mic/Line)
Mono 2 (Mic/Line)
Mono 3 (Mic/Line)
Mono 4 (Mic/Line)
Stereo 5L/6R (Line)
Stereo 7L/8R (Line)
Stereo 9L/10R (Line)
Stereo 11L/12R (Line / SPDIF)
Stereo 13L/14R (Aux Return 1 / USB)
Stereo 15L/16R (Aux Return 2)
Stereo Main Mix (Monitor)

The numbers (with L/R) and "MAIN MIX" are printed on the device itself.

The last two channels (17-18) return the master output of the device, right
before the master volume control.

No capture or playback volume controls are exposed via alsamixer (instead, the
device has hardware knobs).

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