>>> My USB DAC is only capable of 16/44.1 & 16/48 and doesn't do any sort
>>> of oversampling (non-OS). I tried playing a 24/96 file in gmpc and it
>>> plays just fine. This is puzzling since I have:
>>>
>>> audio_output {
>>> type "alsa"
>>> name "USB Monica"
>>> device "hw:0,0"
>>> }
>>>
>>> Shouldn't audio be passed off directly to the DAC in this
>>> configuration, without dmix resampling it?
>>
>> Not exactly. MPD sees that your card cannot do 24 bit, so it converts
>> internally - and it logs that (--verbose). That's usually better than
>> letting dmix it do transparently.
>>
>> Max
>
> Hi Max,
>
> I've finally got my hands on a 24-bit USB DAC and some 24/96 files,
> and it works with mpd, but I'm seeing some strange behavior.
>
> I couldn't get mpd to play with any specification of device such as
> hw:0,0. It plays if I don't specify audio_output at all, but the DAC
> LEDs indicate 16/48 so dmix must be at work.
>
> It does play and LEDs do indicate 24/96 if I specify this:
>
> audio_output {
> type "oss"
> name "USB DAC"
> }
>
> I'm not familiar with OSS at all. Does dmix get involved with OSS, or
> does OSS have something similar that I might prefer to bypass? I'm
> trying to send music from the filesystem to the DAC untouched. Any
> other reason to prefer ALSA over OSS?
>
> Do you have any idea why the DAC doesn't work when hw:0,0 is specified? I
> get:
>
> # aplay -L
> null
> Discard all samples (playback) or generate zero samples (capture)
> # cat /proc/asound/devices
> 0: [ 0] : control
> 1: : sequencer
> 16: [ 0- 0]: digital audio playback
> 33: : timer
> # cat /proc/asound/cards
> 0 [USBDAC ]: USB-Audio - USBDAC
>
> Otherwise 24-bit support works great in mpd. Thanks for coding that up!
>
> - Grant
I got it working with alsa by specifying plughw:0 instead of hw:0.
- Grant
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