mirror of
https://github.com/kuhyx/wake-alarm.git
synced 2026-11-10 18:07:05 +01:00
Krzysztof kuhy Rudnicki
728e00cde7
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
63 lines
2.0 KiB
Bash
Executable File
63 lines
2.0 KiB
Bash
Executable File
#!/bin/bash
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# ============================================================================
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# Ring the PC speakers straight through ALSA, as root.
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#
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# ExecStart of wake-alarm-ring-alsa.service (installed to
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# /usr/local/lib/wake-alarm/). Used by the PC fallback alarm when no
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# graphical session owns the sound (night lockdown: nobody logged in, and
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# the user is not in `audio`). Unmutes and maxes every playback control the
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# speakers' card has, plays the rising WAV once, then loops the full-volume
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# one until systemd stops the unit (RuntimeMaxSec is the backstop).
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#
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# Usage: ring_alsa.sh <rise.wav> <loop.wav>
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# ============================================================================
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set -euo pipefail
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# The speakers: ALC897 Analog on the motherboard codec (`aplay -l`).
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# Overridable only so the vmbox gate can aim it at snd-dummy.
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readonly CARD="${WAKE_ALARM_CARD:-Generic_1}"
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readonly DEVICE="plughw:CARD=${CARD},DEV=0"
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# Playback controls that may gate the speakers; only those present are set.
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# Front is the rear line-out jack on this board.
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readonly CONTROLS=(Master PCM Speaker Headphone Front)
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# A failed aplay (device briefly held elsewhere) must not spin the CPU.
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readonly RETRY_SECONDS=1
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usage() {
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echo "Usage: $(basename "$0") <rise.wav> <loop.wav>" >&2
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exit 2
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}
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unmute_all() {
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local control
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for control in "${CONTROLS[@]}"; do
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if amixer -c "$CARD" sget "$control" >/dev/null 2>&1; then
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# Volume and switch separately: a control may have only one.
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amixer -q -c "$CARD" sset "$control" 100% >/dev/null 2>&1 || true
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amixer -q -c "$CARD" sset "$control" unmute >/dev/null 2>&1 || true
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echo "set $control to 100%, unmuted"
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fi
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done
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}
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play() {
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aplay -q -D "$DEVICE" "$1" || sleep "$RETRY_SECONDS"
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}
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main() {
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[[ $# -eq 2 ]] || usage
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local rise="$1" loop="$2"
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[[ -r "$rise" && -r "$loop" ]] || {
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echo "Error: cannot read $rise / $loop" >&2
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exit 1
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}
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unmute_all
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play "$rise"
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while true; do
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play "$loop"
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done
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}
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main "$@"
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