SoundWire
Audio Communication System
SoundWire lets you stream
any music from your Windows or Linux PC to your Android mobile devices. Use it
as:
A
wireless extension of your PC-based music or home theatre system
A
remote speaker or wireless headphones
A
way to listen to music and movies from your computer anywhere in your house or
out on your deck
SoundWire does audio
mirroring. You can use any music player on your PC or laptop like Spotify,
YouTube, or iTunes and send the sound directly to your Android device.
SoundWire lets you listen to the free version of Spotify on your phone.
SoundWire has low latency (audio delay), which means it can even
be used to listen to the soundtrack of a movie or YouTube video while you
watch. (Note you must adjust the buffer size in app settings for low latency,
see below.) There are other uses too... SoundWire can work as a baby monitor or
listening device with any Windows computer such as a netbook that has a
built-in microphone. Or hook up turntables to your computer's line input and
stream a live DJ set to another part of the house or anywhere else over 3G/4G/5G.
Features
Real-time
audio capture and streaming to multiple clients
Excellent
sound quality (44.1 / 48 kHz stereo 16-bit, PCM or Opus compression)
Low
latency
Audio
equalizer
Easy
to use
Compression
option greatly reduces network usage
Stream
music from PC to PC
running x86 virtualized app
Save
everything you hear to a file (MP3 or WAV)
SoundWire Server Setup
Before using SoundWire on your Android device you must install
and run the SoundWire Server application on the Windows or Linux PC/laptop/tablet
which is your source of music, web audio streaming, or other sounds.
1.
Download SoundWire Server at georgielabs.net. Depending on your PC operating system choose the Windows
7/8/10, Windows XP, or Linux version as appropriate. Raspberry Pi is also
supported. Do not obtain the server from any other web site. Open the ZIP file
and run the installer inside. You must answer yes ("Allow access") to
the Windows Firewall prompt (select both private and public networks). For the
Linux version see the README.txt file for instructions.
2.
Open your favorite PC music application
or web site like YouTube, Spotify, or iTunes
3.
Run the SoundWire Server
program and select the audio source. On Windows 7/8/10 the default settings
should capture what you hear now (“default multimedia device”). On Windows XP
you should select the audio source named “Stereo Mix”, “Wave Out Mix”, “What U
Hear”, or a similar name. On Linux follow the instructions in the README file. You
can send any audio source to your phone, including speaker output, microphone,
line input etc.
4.
When music is playing check the
SoundWire Server level meter. This shows the volume level of sound being
transmitted to your Android device. You may adjust the level using the volume
control of your music player. If an Audio Input slider is shown on the
SoundWire server use it as well. On Windows 7/8/10 you can also use the SoundWire
server Audio Output slider, but this should normally be set to maximum. On
Linux use Pulse Audio Volume Control to show and control volume levels. On
Windows XP the Audio Output slider controls your PC speaker volume, not the
transmitted audio level.
SoundWire Android App Setup
When the server is running and the level meter shows music
playing, start the SoundWire Android app.
1.
Press the "Connect"
button (coiled wire image) to connect to the server and begin listening. If the
server address box is blank SoundWire will automatically locate the server. When
the wire glows you have a good connection.
2.
If auto locate doesn’t work, or
you have more than one server, enter your server address in the text edit box
before connecting. The server address (IPv4) is shown on the upper left of the
SoundWire Server window, for example: 192.168.1.201. In some situations the
address shown by the server may not be correct, you can hover your mouse over
the address to see other possible addresses (on Linux use ‘ifconfig’). Note
that the SoundWire Server does not choose or control its IP address, that’s
determined by your network configuration.
You can long-press on the connect button at any time to do auto
locate, even if the address box is not blank. If you don’t hear any sound check
that the level meter on the server shows audio being played and that the status
is “Connected”. If the server connection is
lost for more than a few seconds you may have to press the connect button again
(use the “Auto reconnect” settings option to do this automatically). If you
have trouble please see Troubleshooting Tips, below.
Recently Used Server History
Press the “triangle” button beside the server text box to choose
from a list of up to four recently used server addresses. This may be useful if
you run more than one SoundWire server, or your server address changes
frequently and you don’t use auto locate. After selecting the desired address
press the connect button. To clear the server history long-press the triangle button.
If you run DNS on your network or connect over a WAN you can enter any
alphanumeric host name by turning on "Enter alpha server name" in app
settings.
Equalizer (Graphic Equalizer, eq)
You can improve the sound of your music using audio equalizer
and bass boost/surround controls. Press the menu button (three dots) and select
“Equalizer”. Turn it on, then adjust as desired. Note: Headphones/Bluetooth
must be connected to adjust Bass Boost. Turn the equalizer off to hear the
sound without any effects or eq. If the equalizer doesn’t work, see
Troubleshooting below.
SoundWire Full Version and Multiple
Connections
The full version
of SoundWire fully enables Opus audio compression and supports up to 10
connections at once, allowing many different Android devices to receive audio
from the server at the same time. It also has a special Pro Mode to set and
display buffer latency precisely in milliseconds. SoundWire full version has no
ads and no identification voice. For best use of wireless network bandwidth
when running several connections you should turn on compression in each Android
device and connect the SoundWire Server computer to your network using a cable,
not wireless.
Changing SoundWire Settings
Press the menu button (three dots) and select “Settings” to
change SoundWire settings. Some setting changes require SoundWire to reconnect,
so you may hear a momentary audio gap.
Audio buffer size: This
setting controls audio latency. Small buffer sizes give lower latency (shorter audio
delay), but can cause choppy sound. Large buffer sizes help eliminate choppy
sound, but increase latency. At low buffer sizes SoundWire is fast enough to
play audio from movies while watching in real time, although you will need a
good WiFi signal and may still notice minor audio glitches. Some Android
devices may not handle very small buffers well, if so then increase the buffer
size. Don’t use a Bluetooth speaker/headset when you want low latency because
Bluetooth often has terrible latency. When you don’t need very low latency
select a larger buffer size like 128k. With the SoundWire full version app you
can set the buffer size precisely in milliseconds when Pro Mode is enabled. Note
that some Android devices place a fairly high limit on the minimum buffer size
when not using native audio, so you may want to set native audio to “Auto” in
app settings if you haven’t already. Phones and tablets which support Android
low-latency audio should also have native audio set to “Auto” for best latency performance,
with the correct audio sample rate set at the server. See “Android Native Audio”
below for additional tips on latency.
Audio compression: By
default SoundWire sends uncompressed audio (PCM) over the network. Turning on
audio data compression greatly reduces the required network bandwidth by 90% or
more, with virtually no increase in latency. The default bit rate is 128 kbps
but may be changed to 256 or 64 kbps (VBR target rate). SoundWire uses the
advanced Opus codec which has excellent sound quality at 128 kbps, so you
should not normally need to change the bit rate. For voice-only audio a 20 kbps
rate is provided, but be careful not to use this setting for music since it
results in low-quality monophonic sound. Turn on compression whenever reduced
data usage is desirable, e.g. weak WiFi signal or with cell networks.
Compression can reduce audio dropouts and make latency more consistent if your
WiFi performance is poor. SoundWire may use slightly more battery power when
compression is on. Compression requires the full version of SoundWire, in the
free version compression will work for a 10 minute trial period.
Connect on start: Connect to the server as soon as the app
starts. Uses the last server address entered, or auto-locate if the server
address box is blank.
Auto reconnect: Keeps trying to
reconnect continuously if the server connection is lost. This may help if you
have a poor WiFi connection. Use the “Disconnect” button Ⓧ
to stop trying to connect. Note that when this option is on you should always
exit SoundWire when you’re finished using it, or disconnect, otherwise your
phone will stay awake and run down the battery.
Auto reconnect on settings change:
Normally on, turn this off to prevent audio interruptions when changing
settings. If turned off you’ll have to disconnect Ⓧ
and reconnect manually to make certain setting changes take effect (as
indicated by a brief message).
Enter alpha server name: The
server address entry field normally uses a numeric on-screen keyboard for
convenience when entering IP addresses. If you’d like to enter host names
(alphanumeric) then enable this setting. You may also need to enable this
setting in rare cases if your numeric keyboard doesn’t include a dot.
Android Native Audio: This
option is provided because on some phones native audio works better and on some
phones the regular audio path works better. Native audio is an alternate
internal audio path (OpenSL ES) which may perform better (e.g. fewer dropouts) or
have lower latency on some devices. There are three possible settings as
follows:
Auto
– Use native audio with small buffer sizes (32k / 190 ms or less), and standard
audio with larger buffer sizes. Recommended for normal use on devices that support
low-latency audio.
Standard
audio – Do not use native audio. Recommended for devices that don’t support
low-latency audio or devices for which native audio does not work well. The
standard audio path is usually more reliable in this situation.
Android
native audio – Always use native audio. Select if the native path performs
better on your device even at larger buffer sizes, for example if Auto/Standard
have problems like dropouts not caused by network issues or buffer size.
On modern devices that support low-latency audio the low-latency
support only works at a specific audio sample rate (44.1 or 48 kHz) that
depends on your device. A message indicating whether your device supports
low-latency and the required sample rate will be displayed when you click on
this option. To minimize latency set your server audio configuration to match the
displayed sample rate (see Selecting 48
kHz / 44.1 kHz Audio under Advanced Settings, below) and ensure the Android
Native Audio setting is set to ‘Auto’ or ‘Android native audio’. (If you don’t
see this option your phone doesn’t support native audio.)
Disable fast Android audio path: When low-latency
audio is active your Android device routes audio using the “fast audio path”.
In this situation non-essential audio processing is bypassed, including the
audio equalizer. If you would like the equalizer to keep working when
low-latency audio would normally be active use this option to disable the fast
audio path. May increase latency slightly. If the equalizer is not needed keep
this option off. (If you don’t see this option your phone doesn’t support
low-latency audio.)
Mute audio on calls (Android 7 and lower): Normally
on, turn this off to continue hearing SoundWire audio during phone calls.
Pro
Mode: Turning
on Pro Mode lets you set the buffer size precisely in milliseconds, and
displays the current buffer latency in real time while connected. This is
useful in situations where a specific latency is desired. A new Latency Steering
setting appears in the settings menu to control how aggressively SoundWire
attempts to achieve the target latency (approximately buffer size divided by 2).
Note that the actual audio latency will be higher than the indicated audio
buffer latency because many other factors contribute to latency, such as your
Android device’s internal audio path and server-side buffering. Use your ears,
not the displayed numbers, as the final judge of latency performance. Note: Pro
Mode requires the full version of SoundWire.
Server port number: See
Advanced Settings, below.
PC to PC Sound Transmission
You can run the SoundWire Android app on any PC under Windows or
Linux using virtualization. This lets you send sound from one PC to one or
several other PCs. See our simple instructions on how to run Android and SoundWire on a PC.
Low Latency Audio
SoundWire performance and audio latency depend on the software
& hardware capabilities of your phone or tablet. Follow these steps for
lowest audio latency.
·
Make sure you have a good WiFi
signal with no interference, and that your wireless network infrastructure
(router etc.) is working well. For example, restart your router before a
SoundWire listening session.
·
Don’t use a Bluetooth
speaker/headset when you want low latency because Bluetooth often has terrible
latency or latency that builds up or changes arbitrarily. Used a wired
speaker/headset.
·
Set a small buffer size (8 - 16k,
or with pro mode on 40 - 60 ms). If you notice audio glitches then increase the
buffer size or turn on compression.
·
Turn compression off in
SoundWire app settings, unless you need compression on for other reasons like
network performance.
·
Check whether your Android
device supports low latency audio by clicking the Android Native Audio option
in app settings. If a message appears which says “Your Android device supports
low-latency audio at 44.1/48.0 kHz” then ensure native audio is set to “Auto”
(or native always). If the indicated audio sample rate is not the same as being
used by your SoundWire server (44.1 or 48.0 kHz) then in Windows 7/8/10 change
your playback device (speaker) sample rate using the Windows Sound control
panel. On Linux or RPi set the SOUNDWIRE_SERVER_SAMPLE_RATE environment
variable to 44100 or 48000. See Selecting
48 kHz / 44.1 kHz Audio under Advanced Settings, below, for more
information.
· If
your phone or tablet does not support low latency audio, try the Android Native
Audio option set to Auto or Standard and choose whichever setting appears to
give lower latency according to your ear (not numbers shown on screen). If you
do not see the Android Native Audio option under Device settings then native audio
is not supported on your device.
For more information see the descriptions of the Audio Buffer
Size and Android Native Audio settings, above.
Constant Latency
Under normal conditions SoundWire allows the latency to vary
over a fairly wide range for a given buffer size. This is done to minimize
audio artifacts. If you need more consistent latency, for example when
listening from more than one Android device, do the following:
·
Use SoundWire full version on
all Android devices
·
Turn on Pro Mode, then set the
latency steering option to "Very Tight" on all Android devices (this
will make SoundWire try to maintain a specific latency)
·
Set your audio buffer size in
milliseconds to 500, resulting in a target buffer latency of 250 ms. Use a
lower value if you require lower latency.
You may hear more audio artifacts when using SoundWire in this
way. When done you should change latency steering back to “Normal”.
Using SoundWire Over Cell Networks (3G/4G/5G)
It’s possible to use SoundWire over cell data networks instead
of WiFi. We recommend using SoundWire full version with compression turned on.
You'll need at least 150 kilobits/sec consistent download speed on your phone
and should have an unlimited data plan. You must configure your router to forward
UDP port 59010 to your PC. When connecting, enter the correct IP address or
host name (don’t use auto locate). To enter a host name turn on the “Enter
alpha server name” option in the app (otherwise you can only enter numbers). Unless
your PC is connected directly to the internet, don’t use the IP address
displayed by the Soundwire server. Use the IP address obtained by your router
instead. You can find this address by by typing "what's my IP" into a Google search
on your PC. If SoundWire warns that WiFi is not enabled you can
ignore this warning when connecting over cell networks. Select the largest
buffer size (512k) in the Android app settings, and check that compression is
on. You might need to set an even larger buffer if you get dropouts, if so turn
on Pro Mode and try a buffer size of 4000 or 5000 ms. If you set a large buffer
size and see the message “Could not initialize audio playback” then the buffer
size is too large and should be reduced, or turn on the Android Native Audio
setting to allow large buffers up to 8000 ms.
Note that some cell providers block certain types of data like
UDP or certain port number ranges, so if you have trouble try changing the port
number to an unused port in a lower range (both server and client). If you're
using a VPN check that it is configured correctly or disable it.
Using SoundWire Over WAN
To use SoundWire over a Wide Area Network follow the same steps as
for cell networks above. For example, your phone may be connected to WiFi at
work or at a friend’s house and communicate with the SoundWire Server running
at your home.
Recording Audio to a File
On SoundWire Server press the round red button to start saving
audio to a file in MP3 or WAV format. When done, press the stop button. Does
not require an active connection. Note: This feature is not available on the
Linux versions of the server, we suggest using Audacity to record audio on
Linux. If you need to edit or change levels in
your saved MP3 music without reencoding try the excellent mp3directcut.
Using
SoundWire With Bluetooth Tethering
It's possible to use SoundWire over a
Bluetooth tethering network connection. This may be useful if you have a poor
WiFi signal, or no WiFi access point. Follow these steps.
· Set up Bluetooth tethering between your PC
and Android device (phone) in the normal way.
· To test that it's working, disable the
regular network/WiFi on your PC and check that the PC can access the internet
through your phone's internet connection (if phone has one).
· Auto-locate won't work, so you'll need to
enter the correct IP address in the SoundWire app. The Bluetooth IP address may
not be displayed by the server, to find the address do this: In Windows open a
command window (cmd). Type 'ipconfig' and look for "Bluetooth Network
Connection", IPv4 Address. Use this address in the SoundWire app.
· If the address starts with 169.254 then your
Bluetooth tethering connection did not obtain an IP address properly, disconnect
Bluetooth and try again.
· If sound is choppy your Bluetooth tethering
connection may be too slow, turn on compression or increase the audio buffer
size.
It’s also possible to use SoundWire over WiFi
tethering or USB tethering using a similar procedure.
How to Stream Both Microphone (Headset Mic)
and Speaker Audio From Your PC to SoundWire
In SoundWire Server make sure your speaker output is selected
(normally “Default multimedia device”). Then in Windows,
1.
Right click on the small speaker
icon 🔊
in the bottom right of your PC screen. Select Recording devices tab.
2.
Select your microphone in the
list, click Properties (or double click on the microphone entry).
3.
Switch to the “Listen” tab,
check “Listen to this device”. Click Ok.
While Listen is checked your microphone will be audible through
your speakers so you may want to turn down your speakers. You should hear both
your microphone and your speaker output in SoundWire. If you mute your PC
speakers this might block microphone audio, so unmute and turn your speaker
volume very low.
Other Useful Apps
You may want to use an Android remote control app together with
SoundWire to control PC music software from your phone. Some good choices
include: Unified
Remote, VNC Viewer
Troubleshooting Tips
Can’t
connect/locate server: Check the network connections
on your phone and PC. Auto locate may not work in some cases, so enter the
correct server address. In some cases the server might not display the correct
address, e.g. multiple network interfaces, or server is behind a router. On
Windows hover your mouse over the displayed address to see all network
addresses (IPv4). Check your firewall settings on the PC. When you first start
SoundWire Server it should ask you to allow a firewall exception ("Windows
Firewall has blocked some features of this app"), you should answer yes
("Allow access"). You can uninstall & reinstall the server to get
this question again (if it doesn’t appear the exception is in place). You may
need to manually open a firewall port -- the default port number is 59010 UDP,
and 59011 UDP for auto locate. Depending
on your network configuration, you may need to open or forward ports in more
than one place (e.g. multiple routers/firewalls). In rare
cases you may need to change the port number used by SoundWire. To change the
port number see Advanced Settings, below. Ensure that the server level meter
shows sound being played. If the server reported an error such as “unable to
activate audio device” and the level meter isn’t moving then connections will
fail until you successfully select an audio input.
Audio
is choppy: First try restarting your wireless router. Try selecting a
larger buffer size in the SoundWire app settings. Also try turning on audio
compression. If this doesn’t help you probably have a poor WiFi connection. You
will need a fairly good WiFi signal (2 to 4 bars out of 4) to avoid choppy
sound and dropouts. SoundWire shows a warning if you have 2 bars or less out of
4. Heavy network use by other computers on your home network, or high CPU use
by other programs running on your PC or phone can also cause choppy sound. Some
network problems like interference can cause choppy audio even with a strong
WiFi signal. Try setting your wireless access point to a different channel. If
your access point has simultaneous dual band try disabling one band. Try
changing the Android Native Audio setting (see above under Changing SoundWire
Settings).
Volume
level is too low: Try turning up the volume in
your PC music player software and on your phone. On Windows 7/8/10 ensure
the SoundWire Server “Audio Output” level is all the way up and unmuted. If the
server shows an “Audio Input” slider try turning it up. On some phones you may
need to use a different audio path – try setting Android Native Audio to
“Standard” in settings, then set it to “Android Native Audio” and see which one
sounds best (if there is no difference keep it on “auto”). If volume is still
too low on Windows 7/10 open the volume mixer by right-clicking the small
speaker icon 🔊 on the bottom right of your
screen and selecting “Open Volume Mixer”. Find the volume control for your
music player software or web browser and turn it up to the line (not higher,
because that may mess up other levels). On Linux try adjusting levels in Pulse
Audio Volume Control.
Volume
level is too high (level meter shows red frequently or sound is distorted):
Turn down the volume in your music player software. If the server shows an
“Audio Input” slider adjust it first.
Equalizer
doesn’t work: The equalizer
may not be supported on older Android devices. In this case the Equalizer menu
option won’t appear. If the equalizer option appears but doesn’t seem to work
at certain times, turn on the “Disable fast Android audio path” option in app
settings. If it still doesn’t work try setting Android Native Audio to
“Standard” in settings.
Can’t
turn down PC speakers without losing SoundWire audio: Your
PC may not allow you to turn down or mute the speaker output without affecting
the sound transmitted by SoundWire. If muting the speaker also cuts out
SoundWire audio then you must keep the main speaker volume turned up and
unmuted. In this case you can silence laptop or tablet PC speakers by plugging
something into the headphone jack like a connection cable or spare headphones.
On Linux you can silence speakers by selecting profile “off" in the Pulse
Audio Volume Control configuration tab.
Latency
(audio delay) is long: See the section on Low
Latency, above.
Audio
is smooth but quality is bad or not enough bass (server on laptop or tablet):
Your PC may be processing
audio in an undesirable way, for example laptops may reduce bass to avoid
overloading tiny built-in speakers. To fix it
go into the Windows Sound control panel, playback device properties, and turn
off all sound effects and enhancements like SRS, e.g. Realtek Audio Manager.
Also if compression is enabled in the SoundWire app make sure the bit rate is
set to 128 kbps or higher. If you've ever turned on the Android equalizer/bass
boost/surround in SoundWire then open the equalizer controls (menu >
Equalizer) and turn it off. On some phones you may need to use a different
audio path – try setting Android Native Audio to “Standard” in settings, then
set it to “Android Native Audio” and see which one sounds best (if there is no
difference keep it on “auto”).
Can't enter a server
address/name with letters or dots in it: Turn
on the "Enter alpha server name" option in app settings.
Message
“Could not initialize audio playback” appears when trying to connect after
setting a large buffer size: This can be caused by buffer
size limits on certain Android devices when using the “standard” audio path.
Reduce your buffer size setting. If you really need a very large buffer then go
to the Android Native Audio setting and change it to “Android Native Audio”,
this enables buffer sizes up to 8000 ms.
Audio gets choppy or stops when
screen turns off: This is a known problem with
WiFi on some older Android devices when on battery power. You might be able to
fix it by changing WiFi settings: Go to WiFi preferences > Advanced. If you
see the option “Keep Wi-Fi on during sleep” change it to “Always”. If this
doesn’t help, enable the SoundWire “Screen On Wake Lock” option, or plug in
your phone.
Can’t
capture speaker output, Stereo Mix not available (Windows XP only):
Some PC sound hardware doesn't support capturing speaker audio from Wave Out
Mix / What U Hear / Stereo Mix. You may be able to activate the stereo mix
option in settings. Alternatively use a short patch cord with two 1/8"
stereo plugs to connect your PC audio output to the input, then select “Line
In” or “Microphone” in SoundWire Server. More information and pictures here. Consider
upgrading to Windows 7 or later since these versions of Windows do not need
Stereo Mix to monitor the audio output.
Can’t
capture audio from a Windows 7/8/10 application: Some
professional music applications on Windows access the audio hardware in
“exclusive” mode, or use third-party audio drivers like ASIO. This prevents
SoundWire from capturing their audio. Try the patch cord trick described above.
This problem can also be caused by DRM music material.
About SoundWire Audio Communication
Capturing and streaming audio in real time with low latency is
not easy. Even minor network communication dropouts can make audio sound
choppy. SoundWire communicates with the server using an optimized reliable
network protocol, and uses concealment techniques to make dropouts hard to
notice if they occur and can’t be corrected in time. Increasing your buffer
size setting will make audio smoother but also increases latency. Turning on
audio compression can also reduce dropouts by reducing network load.
Advanced Settings
Multichannel
Audio / Surround:
Your Windows speaker outputs may be configured for 5.1 or 7.1
surround sound, or some other multichannel configuration using the Sound
control panel (if supported by your audio hardware). In this case you can
choose which pair of channels to send to your Android device using controls
which appear in the SoundWire Server window. Depending on the number of
surround channels available you can choose between the following options:
·
Front L/R – front left and
right channels
·
Fr C/LFE – front center and LFE
(low frequency sounds)
·
Side L/R – side left and right
channels
·
Back L/R – rear left and right channels
Normally you should choose Front L/R, which is the default
setting.
Selecting 48 kHz / 44.1 kHz Audio: To
switch between 48 kHz and 44.1 kHz sample rate audio you must configure your
SoundWire Server computer appropriately. On Windows 7/8/10 set the sample rate
for your speaker output to 48000 or 44100 in the Windows Sound control panel (right
click on the small speaker icon 🔊 in the bottom right of the screen,
select Playback devices, find your speakers in the list, click Properties,
Advanced). When done restart SoundWire Server. On Linux and Raspberry Pi define
environment variable SOUNDWIRE_SERVER_SAMPLE_RATE giving it the value 48000 or
44100. Make sure to configure the Linux Pulse Audio sample rate to match,
otherwise sample rate conversion will be required, reducing audio quality and
placing extra load on the CPU (see Linux README.txt). When done restart Pulse
Audio and SoundWire Server. Note that using the 48 kHz setting may reduce sound
quality for typical audio sources like web sites and MP3 files because sample
rate conversion from 44.1 to 48 kHz is required. However some Android devices
may need 48 kHz audio to enable low-latency audio support. Unless you know your
audio source material is 48 kHz you should use 44.1 kHz audio with SoundWire
Server (the server may warn you about this when it starts, one time only). An
exception to this rule is if your Android device supports low-latency audio at
48 kHz and you want to minimize latency, then you should configure the server
for 48 kHz (see the description of the Android Native Audio setting above for
details).
Network Port #: To
change the network port number used by SoundWire Server set the environment
variable SOUNDWIRE_SERVER_PORT to the desired number and restart SoundWire
Server (see instructions for setting environment variables in Windows here).
You must then set the same port number in the SoundWire Android app, under
advanced settings. You can also enter the port number after the server address
separated by a colon or comma, e.g. 192.168.1.149:50000 or 192.168.1.149,50000.
Soundwire also uses the next port number (one higher) for auto locate. You can
use command line parameters to set the port number when starting SoundWire
Server instead of the environment variable, see “Multiple Audio Channels Using
Multiple Network Ports” below.
Multiple Audio Channels Using Multiple
Network Ports: SoundWire
Server normally lets you run only one instance of the program, allowing you to
stream one stereo audio channel from that PC. Under Windows and Linux it’s
possible to run multiple servers, each set to a different network port number.
Then by selecting a different audio source for each server instance you can
stream multiple stereo audio feeds (or different surround channel pairs) to
different Android devices. You must start each instance of SoundWire Server
using the -p command line option to set its port number, for
example
SoundWireServer –p 59010
SoundWireServer –p 59020
SoundWireServer –p 59030
This runs three instances of the
server set to use the indicated port numbers. In the Android app set
the desired port number under advanced app settings, or enter the port number
after the server address separated by a colon or comma. Change the port number to listen to a different audio source. Don’t
forget to open the additional ports in your firewall(s). An easy way to specify
the -p command line option is to add it in the target string of a desktop
shortcut. Create multiple desktop shortcuts for the SoundWire Server program,
then edit shortcut properties to make each target string specify a different
port number. When using SoundWire Server in this way each server instance shows
its port number in the title bar for identification. On Linux use Pulse
Audio Volume Control to select different
audio sources for each SoundWireServer instance.
Browsable Intent: Use the following HTML link to open SoundWire:
<a
href="soundwire.georgielabs.net:">
This will open the SoundWire full
version app if present, otherwise it will open the free version.
Music Level Meters and Visualizers
The SoundWire Android app has a minimal user interface with no
audio level meters or visualizers. We expect that you’ll switch away from the
app as soon as music starts playing. Instead, SoundWire sends accurate stereo
metering data to GeorgieLabs Music VU Visualizer
Widgets app (if installed). Music VU can be used
to display audio level meters, spectrum graphs and waveform visualizers on your
home screen while listening to SoundWire. Music VU visualizers also work with other
music players on your Android device.
User Feedback
Please rate the app and submit comments on Google Play to let us
know what you think of SoundWire, or send email to soundwire@georgielabs.net.
If you’d like a response you should use email. Possible future SoundWire
features include:
Let us know what
features you'd like to see, or if you have a bug to report. If you enjoy using
SoundWire please consider supporting the developers by purchasing the full version.
Note there is no iOS version of the app – we have good evidence that SoundWire
would be rejected by Apple.
Go to the GeorgieLabs main page.
SoundWire free version privacy policy.
SoundWire full version privacy policy.
© 2011 – 2020 Georg Feil
and GeorgieLabs, ver 3.0 (Apr 2019, minor updates Jun 2020)