36 lines
1.1 KiB
Bash
36 lines
1.1 KiB
Bash
#!/bin/bash
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# detect-i2s-device.sh — Probe for available I2S audio devices
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# and create /run/i2s-audio-dev containing the best candidate.
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# Called by detect-i2s-device.service before pd-synth-i2s starts.
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set -euo pipefail
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DEVICE_FILE="/run/i2s-audio-dev"
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write_dev() { echo "$1" > "$DEVICE_FILE"; echo "[DETECT] I2S device: $1"; exit 0; }
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# Try named I2S devices first (most reliable)
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for dev in "hw:I2S,0" "hw:MI2S,0" "hw:i2s,0" "hw:mi2s,0"; do
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if aplay -l 2>/dev/null | grep -qi "${dev%,*}"; then
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write_dev "$dev"
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fi
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done
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# Try probing ALSA device list for anything that looks like I2S
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while read -r card; do
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id=$(echo "$card" | awk '{print $2}' | tr -d ':')
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name=$(echo "$card" | cut -d: -f2- | xargs)
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if echo "$name" | grep -qi -E "(i2s|mi2s|quat|tert|dac|audio)"; then
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write_dev "hw:$id,0"
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fi
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done < <(cat /proc/asound/cards 2>/dev/null || true)
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# Fallback to hw:0,0 (first audio device, may be HDMI or analog)
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if aplay -l 2>/dev/null | grep -q "^card 0"; then
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write_dev "hw:0,0"
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fi
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# Nothing found
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echo "[DETECT] No I2S audio device found" >&2
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echo "" > "$DEVICE_FILE"
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exit 1
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