From: Jaroslav Kysela <perex@perex.cz>
Date: Mon, 21 Nov 2022 08:51:54 +0000 (+0100)
Subject: USB-Audio: allow to configure period size for PCM split
X-Git-Tag: v1.2.9~53
X-Git-Url: https://git.alsa-project.org/?a=commitdiff_plain;h=71ff24cdd2e0fecb71c2fcf8a45a1ae50233c34b;p=alsa-ucm-conf.git

USB-Audio: allow to configure period size for PCM split

The environment variable UCM_USB_PERIOD_TIME (microseconds / μs)
can define the period size for the PCM channel split over
the default value 10000μs.

BugLink: https://github.com/alsa-project/alsa-ucm-conf/pull/240
Fixes: https://github.com/alsa-project/alsa-ucm-conf/issues/238
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
---

diff --git a/ucm2/USB-Audio/USB-Audio.conf b/ucm2/USB-Audio/USB-Audio.conf
index 89482cb..fdc29ec 100644
--- a/ucm2/USB-Audio/USB-Audio.conf
+++ b/ucm2/USB-Audio/USB-Audio.conf
@@ -4,6 +4,14 @@ Define.ProfileName ""
 Define.MixerRemap ""
 Define.SplitPCMPeriodTime 10000		# 10ms
 
+If.env1 {
+	Condition {
+		Type String
+		Empty "${env:UCM_USB_PERIOD_TIME}"
+	}
+	False.Define.SplitPCMPeriodTime "${env:UCM_USB_PERIOD_TIME}"
+}
+
 If.linked {
 	Condition {
 		Type RegexMatch