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From: Takashi Iwai <tiwai@suse.de>
To: Filip Van Lunteren <filip.pinkfaun@outlook.com>
Cc: "alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>,
	"perex@perex.cz" <perex@perex.cz>
Subject: Re: native DSD on PCI linux driver
Date: Tue, 03 Dec 2024 13:31:03 +0100	[thread overview]
Message-ID: <871pypymm0.wl-tiwai@suse.de> (raw)
In-Reply-To: <AS4P189MB20372D46254D6425C820FC9C882F2@AS4P189MB2037.EURP189.PROD.OUTLOOK.COM>

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

       reply	other threads:[~2024-12-03 12:31 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <AS4P189MB20372D46254D6425C820FC9C882F2@AS4P189MB2037.EURP189.PROD.OUTLOOK.COM>
2024-12-03 12:31 ` Takashi Iwai [this message]
2024-12-03 12:43   ` native DSD on PCI linux driver Takashi Iwai

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