Re: native DSD on PCI linux driver

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On Tue, 26 Nov 2024 10:41:21 +0100,
Filip Van Lunteren wrote:
> 
> 
> Hello,
> 
> I am currently developing PCI audio output hardware and driver and want to
> integrate native DSD playback. I am struggling to find documentation on this.
> Is there DSD native support in ALSA? And how do I incorporate it? PCM is
> already set up and works.

AFAIK, in the driver side, there is not much special; it assumes that
DSD samples are passed over the standard PCM stream, and the driver
uses special formats SNDRV_PCM_FORMAT_DSD_U8, *_U16 and *_U32 (with
_LE and _BE suffix) for 8, 16 and 32bit, instead of the standard
SNDRV_PCM_FORMAT_U8, *_S16, etc.  For those formats, the silence data
is assumed to be 0x69, 0x6969, etc.


Takashi



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