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#!/usr/bin/env bash
# discord_input.sh: easily merge multiple audio streams together for discord, etc
# Copyright (C) 2021 Vidhu Kant Sharma (vidhukant@protonmail.ch)
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
switch_discord_input=ask
sink_name=merged_streams
sink_description=""
show_help() {
echo -e "Usage:"
echo -e "\tNo Flags: Interactive Mode"
echo -e "-n\tSpecify Number Of Streams"
echo -e "-s\tSpecify a sink to loopback from"
echo -e "-S\tSwitch Discord's Input Or Not (yes/no/ask). if -s is used, 'ask' will be disabled"
echo -e "-N\tSpecify a Name For The Merged Sink"
echo -e "-D\tSpecify a Description For The Merged Sink"
echo -e "-h\tDisplay this message and quit"
exit
}
while getopts 'n:s:S:N:D:h' flag; do
case "${flag}" in
n) no_of_streams="${OPTARG}" ;;
s) spec_sources+=("$OPTARG") ;;
S) switch_discord_input="${OPTARG}" ;;
N) sink_name="${OPTARG}" ;;
D) sink_description="${OPTARG}" ;;
h) show_help ;;
*) ;;
esac
done
shift $((OPTIND -1))
spec_sources_len="${#spec_sources[@]}"
# handle invalid input for -s
if [ "$switch_discord_input" != yes ] && \
[ "$switch_discord_input" != no ] && \
[ "$switch_discord_input" != ask ]
then
echo "ERROR: Please enter a valid input for -s (yes/no/ask)" >&2;exit 1
exit 1
fi
# get the amount of streams to merge if not specified
if [ "$no_of_streams" != "" ]; then # if -n is used
# handle invalid input for -n
re='^[0-9]+$'
if ! [[ "$no_of_streams" =~ $re ]] ; then
echo "ERROR: -n is not specified a number!" >&2; exit 1
fi
# if -s is used
if [ "$spec_sources_len" != 0 ]; then
# check if args of -n exceed spec_sources
if ! [ "$spec_sources_len" -eq "$no_of_streams" ]; then
echo -e "ERROR: arguments of -n don't match number of sources specified.\nPlease only pass the number of -s flags in -n, or omit -n overall." >&2; exit 1
fi
# check if switch_discord_input is 'ask', and shows error
if [ "$switch_discord_input" == ask ]; then
echo "ERROR: -s flag disables interactive mode, so -S can't be 'ask'" >&2; exit 1
fi
fi
else # if -n not used
# if -s and -n are not used, it will ask for input
if [ "$spec_sources_len" == 0 ]; then
printf "\033[1;36mEnter number of sinks/sources to merge: \033[0m"
read -r no_of_streams
else
# checks if switch_discord_input is 'ask', and shows error
if [ "$switch_discord_input" == ask ]; then
echo "ERROR: -s flag disables interactive mode, so -S can't be 'ask'" >&2; exit 1
fi
# if sources specified using -s flag, no_of_streams will be calculated
no_of_streams="$spec_sources_len"
fi
fi
if [ "$sink_description" == "" ]; then
sink_description="$sink_name"
fi
# create NULL sink to merge all the audio streams
pacmd load-module module-null-sink sink_name="$sink_name"
# change desc of NULL sink and it's monitor for visual purpose
pacmd update-sink-proplist "$sink_name" device.description="$sink_description"
pacmd update-source-proplist "$sink_name.monitor" device.description="\"Monitor of $sink_name\""
i=0; while [ $i -lt "$no_of_streams" ]; do
# ask to enter sources if not passed with flags
if [ "$spec_sources_len" == 0 ];then
# get sources and split
SAVEIFS=$IFS
IFS=$'\n'
# somebody help
sources=($(pacmd list-sources | awk '/name:/ {print $2}; /device.description/ {$1=$2=""; print $0}' | sed 's/^[ \t\"]*//; s/[ \t\"]$//' | awk 'NR%2==0 {printf "\033[34m"$0"\t \033[0;32m"f"\033[0m\n"} {f=$0}'))
IFS=$SAVEIFS
# print all the sources with their indices
for (( j=0; j<${#sources[@]}; j++ )); do
unformatted_sink_name="$(echo "${sources[j]}" | sed 's/\x1B\[[0-9;]\{1,\}[A-Za-z]//g')"
new_sink_name="Monitor of $sink_name <$sink_name.monitor>"
# do not print the newly created NULL output's monitor
if [ "$unformatted_sink_name" != "$new_sink_name" ]; then
printf "\033[1;33m%s: %s\n" "$j" "${sources[$j]}"
fi
done
# ask to enter source number
printf "\033[1;36mEnter a value: \033[0m"
read -r source_idx
# extract source name and save it
source_sel=$(echo "${sources[source_idx]}" | sed 's/\x1B\[[0-9;]\{1,\}[A-Za-z]//g' | awk -F "\t" '{print $2}' | sed 's/^[ <]*//; s/>$//')
else
# if source passed with -s flag use it
source_sel="${spec_sources[i]}"
fi
# finally create loopback
pacmd load-module module-loopback sink="$sink_name" source="$source_sel"
# get new loopback's index and rename loopback
loopback_idx=$(pacmd list-source-outputs | grep -E '(.*index: .*)|(^\s+media.name = .*)' | awk "/Loopback to $sink_name/ {printf f} {f=\$2}")
pacmd update-source-output-proplist "$loopback_idx" media.name="\"Merged #$((i+1)) to $sink_name\""
i=$((i + 1))
done
# check if switching disabled through flags
if [ "$switch_discord_input" != no ]; then
# get index of discord's source output
discord_idx="$(pacmd list-source-outputs | grep -E '(.*index: .*)|(^\s+application.process.binary = .*)' | awk '/Discord/ {printf f} {f=$2}')"
# ask the user and change discord's input to new input
if [ "$discord_idx" == "" ]; then
printf "\033[1;34mDiscord instance not found/recording. If it is running, please use Discord settings or pavucontrol to manually change its input.\033[0m\n"
else
if [ "$switch_discord_input" == ask ]; then
printf "\033[1;36mDiscord is running, switch discord's input to new merged input?(y/n)\033[0m "
# get response
while :; do
read -r response
if [ "$response" == y ] || [ "$response" == Y ]; then
pacmd move-source-output "$discord_idx" "$sink_name.monitor"
break
elif [ "$response" == n ] || [ "$response" == N ]; then
break
else
printf "\033[1;36mPlease enter a valid input (y/n):\033[0m "
fi
done
else
pacmd move-source-output "$discord_idx" "$sink_name.monitor"
fi
fi
fi
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