From mboxrd@z Thu Jan  1 00:00:00 1970
From: Daniel Mack <zonque@gmail.com>
Subject: Re: Support for DSD streams
Date: Wed, 27 Mar 2013 10:53:21 +0100
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To: Andreas Koch <andreas@akdesigninc.com>
Cc: Jussi Laako <jussi@sonarnerd.net>, Takashi Iwai <tiwai@suse.de>, clemens@ladisch.de, alsa-devel@alsa-project.org, demian@auraliti.com, ray@auraliti.com
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On 24.03.2013 02:33, Andreas Koch wrote:
> Hi Daniel,
> 
> At 11:43 AM 3/23/2013, Daniel Mack wrote:
>> Hi Andreas,
>>
>> On 23.03.2013 18:35, Andreas Koch wrote:
>>>> Yes, understood. The thing is just that we shouldn't break exising
>>>> solutions that already rely on this "bandaid".
>>>
>>> You wouldn't break any existing solution based on DoP, because that
>>> solution is dealt with in the application on one side and the DAC on
>>> the other side. The driver and USB transfer both think it is PCM data
>>> that is being sent.
>>
>> Well, that was exactly the problem with your device. With the driver as
>> it was, it exposed a PCM interface which is 16-bit wide, and that was
>> picked by ALSA when playing 16-bit material (because ALSA takes whatever
>> is offered by the hardware natively).
> 
> Not quite - the 16-bit wide interface offered by my DAC is not PCM, 
> but raw data.

For the correct quirks handling, I'd need to know whether all products
with your vendor ID are DSD capable on alt interface settings > 1. Is
that assumption correct or should I narrow it down to the product ID of
the MPD-3?


Thanks,
Daniel