62 lines
2.2 KiB
Bash
62 lines
2.2 KiB
Bash
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#!/bin/sh
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# This script sets up the audio subsystem to route audio to and from the modem.
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# Called by samsungipcd when the call starts. When the call ends, we receive a
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# newline and terminate ourselves.
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# Note: as a side effect, software on the phone cannot access the microphone
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# during a call.
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# Put ourselves into a PID namespace. This is an easy and non-racey way to
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# ensure that all child processes get killed on our exit.
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if [ "$$" != 1 ]; then
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unshare -p sh "$0"
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exitcode="$?"
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# Restore MIC1 state to normal. We should be the only entity fiddling
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# with that.
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amixer -D sysdefault cset name='MIC1 MIC1 On' 1
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exit "$exitcode"
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fi
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# callaudiod has already changed the UCM verb, no need to do it manually
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#alsaucm set _verb 'Voice Call'
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# In order for sound to be forwarded, there must be applictions that are
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# currently playing and recording audio. To ensure that they exists, we
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# connect to each user's PipeWire and start ones.
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# Playback
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for i in /run/user/*/; do
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# To avoid vulnerabilities in PulseAudio becoming LPEs, setuid to the
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# user running PipeWire.
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XDG_RUNTIME_DIR="$i" su -c 'aplay /dev/zero' "$(grep "^[^:]*:[^:]*:$(basename "$i"):" /etc/passwd | cut -d : -f 1-1)" &
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done
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# Same for recording
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for i in /run/user/*/; do
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XDG_RUNTIME_DIR="$i" su -c 'arecord /dev/null' "$(grep "^[^:]*:[^:]*:$(basename "$i"):" /etc/passwd | cut -d : -f 1-1)" &
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done
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# Microphone switching logic
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for i in /run/user/*/; do
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XDG_RUNTIME_DIR="$i" su -c '
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# Set locale to C to avoid parsing localized command output
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export LANG=C
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# Report microphone mute events
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( echo; pactl subscribe; ) | while read; do pactl get-source-mute @DEFAULT_SOURCE@; done
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' "$(grep "^[^:]*:[^:]*:$(basename "$i"):" /etc/passwd | cut -d : -f 1-1)" &
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done | while read line; do
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if [[ "$line" == "Mute: yes" ]]; then
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amixer -D sysdefault cset name='MIC1 MIC1 On' 0
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elif [[ "$line" == "Mute: no" ]]; then
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amixer -D sysdefault cset name='MIC1 MIC1 On' 1
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fi
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done &
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# Wait for newline from samsungipcd. This means that the call has ended.
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read
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# No need to clean up, closing the PID namespace will kill all children
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#jobs -p | xargs kill
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# Again, callaudiod will switch UCM verbs for us
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#alsaucm set _verb 'HiFi'
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