tree d4f50860eb63a511612b4495c2386ec149b53e27
parent 7f38ca047b0cb54df7f6d9e4110e292e45dba6ad
author Nobutaka Okabe <nob77413@gmail.com> 1481565178 +0900
committer Takashi Iwai <tiwai@suse.de> 1481579015 +0100

ALSA: usb-audio: Eliminate noise at the start of DSD playback.

[Problem]
In some USB DACs, a terrible pop noise comes to be heard
at the start of DSD playback (in the following situations).

- play first DSD track
- change from PCM track to DSD track
- change from DSD64 track to DSD128 track (and etc...)
- seek DSD track
- Fast-Forward/Rewind DSD track

[Cause]
At the start of playback, there is a little silence.
The silence bit pattern "0x69" is required on DSD mode,
but it is not like that.

[Solution]
This patch adds DSD silence pattern to the endpoint settings.

Signed-off-by: Nobutaka Okabe <nob77413@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>