From: Jaroslav Kysela <perex@perex.cz>
Date: Fri, 8 Jul 2022 12:54:58 +0000 (+0200)
Subject: SplitPCM: Set buffer parameters for dshare/dsnoop
X-Git-Tag: v1.2.7.2~11
X-Git-Url: https://git.alsa-project.org/?a=commitdiff_plain;h=fb69d0f0274b03e1ead0a7feeaceac608760dc72;p=alsa-ucm-conf.git

SplitPCM: Set buffer parameters for dshare/dsnoop

Set the period time to 20ms and buffer time to 500ms by default.
For USB devices, use the period time 10ms for the better latency.

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 689982e..776e4e7 100644
--- a/ucm2/USB-Audio/USB-Audio.conf
+++ b/ucm2/USB-Audio/USB-Audio.conf
@@ -2,6 +2,7 @@ Syntax 6
 
 Define.ProfileName ""
 Define.MixerRemap ""
+Define.SplitPCMPeriodTime 10000		# 10ms
 
 If.linked {
 	Condition {
diff --git a/ucm2/common/pcm/split.conf b/ucm2/common/pcm/split.conf
index 95a65b5..a92a3b2 100644
--- a/ucm2/common/pcm/split.conf
+++ b/ucm2/common/pcm/split.conf
@@ -23,6 +23,23 @@ DefineMacro.SplitPCM.If.0 {
 		Empty "${var:@SplitPCM}"
 	}
 	True {
+		If.period_time {
+			Condition {
+				Type String
+				Empty "${var:-SplitPCMPeriodTime}"
+			}
+			True.Define.__period_time 20000
+			False.Define.__period_time "${var:SplitPCMPeriodTime}"
+		}
+		If.buffer_time {
+			Condition {
+				Type String
+				Empty "${var:-SplitPCMBufferTime}"
+			}
+			True.Define.__buffer_time 500000
+			False.Define.__buffer_time "${var:SplitPCMBufferTime}"
+		}
+
 		LibraryConfig.pcm.SubstiConfig.pcm."${var:__Name}" {
 			@args [ CARD DEV CHN0 ]
 			@args {
@@ -40,6 +57,8 @@ DefineMacro.SplitPCM.If.0 {
 					chmap [ "${var:__HWChannelPos0}" ]
 				}
 				channels "${evali:$__HWChannels}"
+				period_time "${evali:$__period_time}"
+				buffer_time "${evali:$__buffer_time}"
 			}
 			bindings.0 $CHN0
 		}