[alsa-devel] [PATCH] ALSA: usb: Add support for Zoom R16/24 capture and midi interfaces

[Takashi Iwai]

At Sun, 30 Nov 2014 12:08:38 +0200,
Panu Matilainen wrote:
> 
> On 11/29/2014 09:39 PM, Takashi Iwai wrote:
> > At Sat, 29 Nov 2014 21:35:04 +0200,
> > Panu Matilainen wrote:
> >>
> >> This makes the midi interface and capture work out of the box with
> >> R16 (and presumably R24 too but untested). Playback stream would also
> >> seem to function fine except for one caveat: no sound is produced,
> >> so it is disabled for now.
> >
> > Could you give more comments in the playback iface why it's disabled?
> > Ditto for ifnum=0.
> 
> Sure, I'll post an updated patch with added comments.
> 
> In the meanwhile I started looking at the mixer - this is just guessing 
> but maybe its starting with outputs muted which could explain the 
> playback stream running but without sound.
> 
> The descriptors for interface 0 are garbage but what is there would seem 
> to map to logical elements by subtype and terminaltype, after those the 
> data doesn't seem to add up (eg number of input/output channels 
> missing/wrongly placed etc):
> 
> ** UNRECOGNIZED:  0b 24 01 00 01 35 00 03 01 02 03
>     -> Header?
> ** UNRECOGNIZED:  0c 24 02 05 01 01 00 02 03 00 00 00
>     -> USB streaming input terminal?
> ** UNRECOGNIZED:  09 24 03 08 01 03 00 05 00
>     -> Speaker output terminal?
> ** UNRECOGNIZED:  0c 24 02 09 01 02 00 08 00 00 00 00
>     -> Microphone input terminal?
> ** UNRECOGNIZED:  09 24 03 0c 01 01 00 09 00
>     -> USB streaming output terminal?
> 
> Anything there that might ring a bell, or other ideas where to start 
> poking at this thing?

Yeah, most of these look almost sane, so any off-by-one firmware
issue?


Takashi