56 lines
2.0 KiB
Bash
Executable File
56 lines
2.0 KiB
Bash
Executable File
#!/bin/bash
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# blob:summary=Print the sink whose volume and mute a given output really uses
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# blob:args=[sink-name]
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# blob:group=audio
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# blob:examples=blob audio output sink | blob audio output sink blob_speaker_tuning
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set -uo pipefail
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# A DSP sink -- a speaker tuning filter-chain, or EasyEffects -- can be the
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# selected output without being where loudness lives. Changing its volume alters
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# the level going *into* the processing: the display moves while the speakers do
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# not, and on a chain with a compressor or limiter the tone changes too. Resolve
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# through it to the physical sink it feeds.
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#
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# With no argument this resolves the current default output, so when headphones or
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# HDMI are selected it returns those, not the speakers a tuning happens to front.
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# Callers that need to describe some *other* output -- an output switcher naming
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# the next one in the rotation -- pass that sink explicitly.
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sink="${1:-$(pactl get-default-sink 2>/dev/null)}"
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if [[ -z $sink || $sink == alsa_output.* ]]; then
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printf '%s\n' "$sink"
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exit 0
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fi
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# A DSP sink feeds its physical output through a stream of its own; follow that
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# stream down to the sink underneath.
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downstream="$(pactl list sink-inputs 2>/dev/null |
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awk -v virt="$sink" '
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/^Sink Input #/ {target = ""}
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/^[[:space:]]*Sink:/ {target = $2}
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/node\.name = / {
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name = $0
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sub(/.*node\.name = "/, "", name)
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sub(/"$/, "", name)
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if (index(name, virt) == 1 && target != "") {print target; exit}
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}
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/application\.name = "EasyEffects"/ {
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if (virt == "easyeffects_sink" && target != "") {print target; exit}
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}')"
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if [[ -n $downstream ]]; then
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name="$(pactl list sinks short 2>/dev/null |
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awk -v id="$downstream" '$1 == id {print $2; exit}')"
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if [[ -n $name ]]; then
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printf '%s\n' "$name"
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exit 0
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fi
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fi
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# Nothing resolvable downstream -- the DSP sink may simply be idle and unlinked.
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# Fall back to the sink itself so callers still have something to act on.
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printf '%s\n' "$sink"
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