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| #!/usr/bin/env bash | |
| ### | |
| ### Inspired by https://newbedev.com/redirecting-pulseaudio-sink-to-a-virtual-source | |
| ### with help from https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/Modules | |
| ### | |
| MODULE_REGISTRY="modules.txt" | |
| function load_module() { | |
| echo "loading: $@" | |
| pactl load-module "$@" >> $MODULE_REGISTRY | |
| } | |
| function unload_modules() { | |
| for module_idx in $(tac $MODULE_REGISTRY); do | |
| echo "unloading $module_idx" | |
| pactl unload-module "$module_idx" | |
| done | |
| : > $MODULE_REGISTRY | |
| } | |
| function device_description() { | |
| echo -n "device.description=$1" | |
| } | |
| ########################################### | |
| set -e | |
| ########################################## | |
| mixer_name="$1" # some name which identifies input and output that mixer combines | |
| original_output_name="$2" # pactl list sinks | |
| original_input_name="$3" # pactl list sources | |
| mixer_output_name="${mixer_name}-combiner" | |
| mixer_input_name="${mixer_name}-virtual-mic" | |
| mixer_silence_sink="${mixer_name}-silence" | |
| unload_modules | |
| load_module module-null-sink sink_name="$mixer_name" sink_properties=$(device_description "$mixer_name") | |
| load_module module-combine-sink sink_name="$mixer_output_name" slaves="$mixer_name,$original_output_name" sink_properties=$(device_description "$mixer_output_name") | |
| load_module module-loopback source="$original_input_name" sink="$mixer_name" latency_msec=20 | |
| load_module module-null-sink sink_name="$mixer_silence_sink" sink_properties=$(device_description "$mixer_silence_sink") rate=44100 | |
| load_module module-echo-cancel \ | |
| source_name="$mixer_input_name" source_properties=$(device_description "$mixer_input_name") source_master="${mixer_name}.monitor" \ | |
| sink_name="$mixer_silence_sink" sink_properties=$(device_description "$mixer_silence_sink") sink_master="$mixer_silence_sink" aec_method=null | |
| echo "new output(headphones) name: $mixer_output_name" | |
| echo "new input(mic) name: $mixer_input_name" |
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