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### GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc.
<https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.
This version of the GNU Lesser General Public License incorporates the
terms and conditions of version 3 of the GNU General Public License,
supplemented by the additional permissions listed below.
#### 0. Additional Definitions.
As used herein, "this License" refers to version 3 of the GNU Lesser
General Public License, and the "GNU GPL" refers to version 3 of the
GNU General Public License.
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than an Application or a Combined Work as defined below.
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and utility programs needed for reproducing the Combined Work from the
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#### 1. Exception to Section 3 of the GNU GPL.
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#### 6. Revised Versions of the GNU Lesser General Public License.
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README.md Normal file
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# stream.sh
A quick-and-dirty solution for streaming audio over TCP/IP between
Linux computers with ALSA.
# usage
The architecture consists of a server (Computer With Speakers) and
a client (Computer With Crappier Speakers But We Have Media On It).
The script is self-contained, so you can distribute the same version
to client and server computers.
On the server, run
```
./stream.sh server 1337
```
... and then, on the client, run
```
./stream.sh set
./stream.sh client 10.21.37.1 1337
```
This is enough to get you started, you should start hearing audio
from your local applications on the remote computer. By default,
stream.sh uses WAVE in a RIFF container - this provides a high
quality, low-latency solution. In case your network isn't fast
enough to support raw audio data, you can specify a codec and
bitrate:
```
./stream.sh client 10.21.37.1 1337 libopus 64
```
# debugging
stream.sh has a built-in benchmarking functionality that tries to
guess the correct timings for your hardware. If this is inaccurate
and you hear pops, or the audio drops off completely every ~60s,
you may want to run
```
./stream.sh benchmark ffmpeg
```
and modify the delay variable in the `USER-CONFIGURABLE VARIABLES`
section of stream.sh
# building
```
./pack.sh > stream.sh
```

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bench.sh Executable file
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#!/bin/bash
if [[ "$1" == '' ]]; then
if [[ "$0" != *"bench.sh" ]]; then
echo "usage: $0 bench <path_to_ffmpeg>"
else
echo "usage: $0 <path_to_ffmpeg>"
fi
exit 1
fi
res=()
uwu=0
function count() {
x=0
for (( i=0; i<${#res[@]}; i++ )); do
x=$((x+${res[i]}))
done
uwu=$((uwu+$((x/${#res[@]}))))
echo "$((x/${#res[@]}))"
res=()
}
function invoke() {
( time $@ ) 2>&1 | grep -a real | grep -aPoh "[^(real\t0m\.)].*[^s]"
}
echo "FFmpeg launch benchmark"
echo -n "Burst... "
for (( i=0; i<100; i++ )); do
res+=($(invoke $1))
done
count
echo -n "Set sleep... "
for (( i=0; i<25; i++ )); do
res+=($(invoke $1))
sleep 0.1
done
count
echo -n "Random sleep... "
for (( i=0; i<25; i++ )); do
res+=($(invoke $1))
sleep 0.$((RANDOM%10))
done
count
echo "yeah, try $((uwu/3))"

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client.sh Executable file
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#!/bin/bash
# USER-CONFIGURABLE VARIABLES
len=60
delay=030
ffmpeg_bin=ffmpeg
# ---
function log() {
echo "[$(date "+%T")] $1"
}
function stream() {
$ffmpeg_bin -re -f alsa -channels 2 -sample_rate 44100 -i hw:Loopback,1,0 -t $1 -f matroska -acodec $fmt -b:a $bitrate - 2>$tmp | nc $ip $port
}
function stream_wave() {
$ffmpeg_bin -re -f alsa -channels 2 -sample_rate 44100 -i hw:Loopback,1,0 -t $1 -f wav - 2>$tmp | nc $ip $port
}
function stream_cont() {
$stream $len & sleep $len.$delay
}
function rolling_rocks() {
while true; do
if [[ "$(cat $tmp | grep -a "Input/output error")" != '' ]]; then
rm $tmp
$stream $((len-1)).9 &
log 'Hit a "Device Busy" error, consider increasing sleep delay!'
fi
sleep 0.1
done
}
if [[ "$1" == '' ]]; then
if [[ "$0" != *"client.sh" ]]; then
echo "usage: $0 client <ip> <port> [fmt] [kbps]"
else
echo "usage: $0 <ip> <port> [fmt] [kbps]"
fi
exit 1
fi
if [[ "$3" != '' ]]; then
fmt="$3"
stream="stream"
log 'Container: matroska'
else
fmt="wav"
stream="stream_wave"
log 'Container: RIFF'
fi
if [[ "$4" != '' ]]; then
bitrate="$4"
else
bitrate="128k"
fi
ip=$1
port=$2
tmp=$(mktemp)
rolling_rocks &
log "Loop length: ${len}s"
log "Post-loop delay: ${delay}ms"
log 'Starting main loop...'
while true; do
stream_cont
done

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pack.sh Executable file
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#!/bin/bash
function parse() {
sed -E 's@#!/bin/bash@@g;s/^/\t/g'
}
echo -n '#!/bin/bash
function bench() {'
cat bench.sh | parse
echo -n '}
function client() {'
cat client.sh | parse
echo -n '}
function server() {'
cat server.sh | parse
echo -n '}
function server_core() {'
cat server_core.sh | parse
echo -n '}
function _set() {'
cat set.sh | parse
echo -n '}
function _unset() {'
cat unset.sh | parse
echo '}
if [[ "$1" == "server_core" ]]; then
server_core
elif [[ "$1" == "" ]]; then
echo "usage: $0 <client|server|bench|set|unset> [params]"
elif [[ "$1" == "client" ]]; then
client $2 $3 $4 $5 $6
elif [[ "$1" == "bench" ]]; then
bench $2
elif [[ "$1" == "server" ]]; then
server $2
elif [[ "$1" == "set" ]]; then
_set
elif [[ "$1" == "unset" ]]; then
_unset
fi'

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#!/bin/bash
if [[ "$1" == '' ]]; then
if [[ "$0" != *"server.sh" ]]; then
echo "usage: $0 server <port>"
else
echo "usage: $0 <port>"
fi
exit 1
fi
if [[ "$0" == *"server.sh" ]]; then
ncat -k -l -p $1 -c "./server_core.sh"
else
ncat -k -l -p $1 -c "$0 server_core"
fi

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server_core.sh Executable file
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#!/bin/bash
read -n4 container
if [[ "$container" == "RIFF" ]]; then
(echo -n "$container"; cat -) | aplay -f cd -
else
(echo -n "$container"; cat -) | ffmpeg -re -i - -f wav - | aplay -f cd -
fi

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set.sh Executable file
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#!/bin/bash
sudo rmmod snd-aloop
sudo modprobe snd-aloop pcm_substreams=1
[[ -f ~/.asoundrc ]] && cp ~/.asoundrc ~/.asoundrc_orig
echo 'pcm.!default { type plug slave.pcm "hw:Loopback,0,0" }' > ~/.asoundrc

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unset.sh Executable file
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#!/bin/bash
sudo rmmod snd-aloop
rm ~/.asoundrc
[[ -f ~/.asoundrc_orig ]] && cp ~/.asoundrc_orig ~/.asoundrc