From 00f9199e7b033450264c78fb9fa1e56928b8f8f8 Mon Sep 17 00:00:00 2001
From: Sean Whitton <spwhitton@spwhitton.name>
Date: Mon, 18 Oct 2021 15:43:47 -0700
Subject: whitenoise script: attempt to detect whether earphones connected

---
 scripts/desktop/whitenoise | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/scripts/desktop/whitenoise b/scripts/desktop/whitenoise
index ab86cfde..f8b1c4af 100755
--- a/scripts/desktop/whitenoise
+++ b/scripts/desktop/whitenoise
@@ -1,8 +1,19 @@
 #!/bin/sh
 
-cvlc --quiet --loop ~/annex/media/sounds/R*.ogg &
-whitenoise=$!
+# values for melete -- possibly if we query pulseaudio/pipewire instead we
+# would not need to encode values like these
+snd_card_num=0
+node_num=0x21
+
+# to save battery power, only output the white noise if earphones connected
+if grep -A4 "Node $node_num" "/proc/asound/card${snd_card_num}/codec#0" \
+	| grep 'Amp-Out vals:  \[0x00 0x00\]' >/dev/null; then
+    cvlc --quiet --loop ~/annex/media/sounds/R*.ogg &
+    whitenoise=$!
+fi
 nmcli radio all off
 zenity --info --title="whitenoise" --text="whitenoise"
 nmcli radio all on
-kill $whitenoise
+if [ "x$whitenoise" != "x" ]; then
+    kill $whitenoise
+fi
-- 
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