55

I need to switch the pulseaudio server of a currently playing audio stream.

Pulseaudio server is set up with IP 192.168.1.105

$>cat /etc/pulse/default.pa
...
load-module module-esound-protocol-tcp auth-anonymous=1
load-module module-native-protocol-tcp auth-anonymous=1
load-module module-zeroconf-publish
...

On the source side VLC media player is playing a song.

I created a new tunnel sink with pulseaudio on source side.

pacmd load-module module-tunnel-sink server=192.168.1.105
pacmd set-default-sink 1

But while playing audio the server couldn't be changed immediately. Only after stopping the player and replay, it's ok.

From "gnome-volume-control" or "gnome-control-center sound" switching of output devices is applied immediately.

How can I apply switching the output sink immediately from command line during playback of a sound file?

10 Answers 10

83

PulseAudio pacmd is not capable of switching the default sinks while there is an actively playing stream to the sink input. However there is a way to still achieve this.

Changing default sink from command line

First we need to determine the index number of the sinks we want to switch. This can be done by calling:

pacmd list-sinks

Depending on our system this will give you a more or less lengthy list of sinks and properties that are at present accessible:

 >>> 2 sink(s) available.
      * index: 0
            name: <alsa_output.pci-0000_01_00.1.hdmi-stereo-extra1>
            driver: <module-alsa-card.c>
    :
    :
        index: 1
            name: <alsa_output.pci-0000_00_14.2.analog-stereo>
            driver: <module-alsa-card.c>

The index or the name given here is what we need for adressing the sink by command line. The present default sink is marked with an asterix (here 0).

To be able to switch the default sinks from command line we may need to disable stream target device restore by editing the corresponing line in /etc/pulse/default.pa to:

load-module module-stream-restore restore_device=false

To change the default output sink to sink 1 we then run

pacmd set-default-sink 1

Sucess can be visualized by opening the Sound Settings menu.

Moving a stream to another sink

Changing the default sink while we have an active input stream playing to a given sink has no effect. This should rather be done by moving this input to another sink.

pacmd list-sink-inputs

will tell us the index of the input stream

>>> 1 sink input(s) available.
    index: 5
    driver: <protocol-native.c>

We now know that we want to move the input stream 5 to sink 1 by calling

pacmd move-sink-input 5 1

or back to sink 0 if we like. This will be done immediately without the need of stopping playback.

Changing default sink while playing

Of course we can combine those two commands to immediately switch default sinks during playback e.g. with

pacmd set-default-sink 1 & pacmd move-sink-input 5 1

A drawback of this method is that the input stream index changes every time we stop and restart the music player. So we always have to find out the current stream index before we can switch using the commmand line.

  • You can reference a sink by its index OR by its name pactl list short sinks > 4 bluez_sink.FC_A8_9A_2C_EB_0B module-bluez5-device.c s16le 1ch 8000Hz IDLE now just reference the name pactl set-default-sink bluez_sink.FC_A8_9A_2C_EB_0B – Leif Liddy Jan 21 '17 at 21:57
  • @LeifLiddy: Thank you for the note. In more recent versions of Pulseaudio you can indeed reference to the name of a sink on set-default-sink but you will still need the index number on move-sink-input. – Takkat Jan 22 '17 at 7:27
  • And what if 0 sink input(s) available.? But that shitty flash player is still playing audio? – Zhigalin Sep 29 '17 at 1:03
  • And I see flash player in the client(s) logged in section of pacmd list – Zhigalin Sep 29 '17 at 1:06
  • @Zhigalin Flash is long dead on my systems so I can't reall say... it may play directly through ALSA. – Takkat Sep 29 '17 at 6:03
27

I have written a simple script to move all the sink-inputs automatically.

Usage: ./movesinks.sh <sink number>

#!/bin/bash 
echo "Setting default sink to: $1";
pacmd set-default-sink $1
pacmd list-sink-inputs | grep index | while read line
do
echo "Moving input: ";
echo $line | cut -f2 -d' ';
echo "to sink: $1";
pacmd move-sink-input `echo $line | cut -f2 -d' '` $1

done
  • 1
    Awesome! I extended this a little further for my own use: I wanted an icon on my taskbar that would toggle between two audio cards. I wrote a tiny script in Ruby to determine the current sink and call out to this shell script to make the change (pastebin.com/xb3i2ejW). After that, I put both scripts in ~/bin and customized a KDE icon to run the ruby script. This could be done more elegantly, or entirely in shell script, but it works for me. – Pathogen Jul 2 '15 at 0:10
  • 2
    Thanks for this. Here's a version that switches to the last (? - I only have two) unused output: pastebin.com/raw/sidH7QPb i.e. it toggles the output, suitable for mapping to a hot key. – Julian Mar 3 '16 at 18:35
4

Improved version of @Gaco script

#!/usr/bin/env bash

case "${1:-}" in
  (""|list)
    pacmd list-sinks |
      grep -E 'index:|name:'
    ;;
  ([0-9]*)
    echo switching default
    pacmd set-default-sink $1 ||
      echo failed
    echo switching applications
    pacmd list-sink-inputs |
      awk '/index:/{print $2}' |
      xargs -r -I{} pacmd move-sink-input {} $1 ||
        echo failed
    ;;
  (*)
    echo "Usage: $0 [|list|<sink name to switch to>]"
    ;;
esac

my runtime copy is on github and it includes also automated switching of Master channel for kmix

2

There is a ruby script (that I originally forked and rewrote sections of) that lets you change default sinks, volume, and mute status from the command line.

2

I cobbled together stuff from a few different places and came up with this script to set up a bluetooth JAMBOX once it has been paired. Your MAC will be different of course. Since I control the JAMBOX volume via the Clementine app, 130% volume works best in my case. You might want to change this, along with the rhythmbox.png (it was the only speaker picture I could find on my computer). The error checking is rudimentary, but works pretty reliably. I put this in a desktop launcher for convenience on an ASUS netbook.

#!/bin/bash
# setjambox connection setup
# Find the particulars of your environment with 'pactl list sinks'
# This script uses the sink name instead of the index number
# You also need libnotify-bin to run this script

# Enter the bluetooth MAC address of your device here
MAC=00:21:3C:9F:19:AD

# Make ready
# Convert device address per pulseaudio standards
DEV=$(echo $MAC|tr ':' '_')
TITLE="JAMBOX $MAC"
CONNECTED="Audio connection updated."
PROBLEM="Unable to update settings."
JBLOGO=/usr/share/icons/hicolor/48x48/apps/rhythmbox.png

# And go

pactl list short sink-inputs | while read stream; do
    streamId=$(echo $stream | cut '-d ' -f1)
    pactl move-sink-input "$streamId" bluez_sink.$DEV
done

pactl set-default-sink bluez_sink.$DEV
pactl set-card-profile bluez_card.$DEV a2dp
pactl set-sink-volume  bluez_sink.$DEV 130%

if [ $? -eq 0 ]
then
   notify-send -i $JBLOGO -t 3000 "$TITLE" "$CONNECTED" 
else
   notify-send -i gtk-dialog-warning -t 3000 "$TITLE" "$PROBLEM"
fi
  • +1 for using pactl list short. You can simplify the following line by doing the cut directly after: pactl list short sink-inputs | cut -f1 | while read streamId works for me. – bodo Apr 18 '18 at 11:44
1

CIRCLE-TOGGLE SINKS.

The Gaco script with just one more line to circle-toggle through available sinks.

#!/bin/bash 

new_sink=$(pacmd list-sinks | grep index | tee /dev/stdout | grep -m1 -A1 "* index" | tail -1 | cut -c12-)

echo "Setting default sink to: $new_sink";
pacmd set-default-sink $new_sink
pacmd list-sink-inputs | grep index | while read line
do
echo "Moving input: ";
echo $line | cut -f2 -d' ';
echo "to sink: $new_sink";
pacmd move-sink-input `echo $line | cut -f2 -d' '` $new_sink

done
  • great, simple and scaling! – Paul Bastian Jan 23 at 22:01
1

And here's a script that will toggle between sinks as well:

http://marginalhacks.com/index.0.html#pulse-switch-out

Here's the script below:

#!/usr/bin/ruby
# Filename: pulse-switch-out
# Author:   David Ljung Madison <DaveSource.com>
# See License:  http://MarginalHacks.com/License/
# Description:  Switch pulse audio output (sink) using pacmd

PACMD = %w(pacmd)

##################################################
# Usage
##################################################
def fatal(*msg)
    msg.each { |m| $stderr.puts "[#{$0.sub(/.*\//,'')}] ERROR: #{m}" }
    exit(-1);
end

def usage(*msg)
    msg.each { |m| $stderr.puts "ERROR: #{m}" }
    $stderr.puts <<-USAGE

Usage:  #{$0.sub(/.*\//,'')} [sink]
  Switch sound playback device for ALSA/pulseaudio

    [sink]   Specify sink number to use (see 'pacmd list-sinks')

    USAGE
    exit -1;
end

def parseArgs
    opt = Hash.new
    loop {
        if (arg=ARGV.shift)==nil then break
        elsif arg == '-h' then usage
        elsif arg == '-?' then usage
        #elsif arg == '-arg' then opt[:arg] = true
        elsif arg =~ /^(\d)$/ then opt[:sink] = arg.to_i
        else
            usage("Unknown arg [#{arg}]")
        end
    }

    opt
end

# Unfortunately you can't return or break from the yield without leaving
# the pipe open, maybe use some sort of ensure and figure out how to close?
def pipe(cmd)
        # This is leaving files open
    #IO.popen(cmd.join(' ')).each { |l|
    a = `#{cmd.join(' ')}`
    ret = $?
    a.split("\n").each { |l|
        yield l
    }
    $?
end

def getSinks(ins=false)
    cmd = PACMD.dup
    cmd.push(ins ? 'list-sink-inputs' : 'list-sinks')
    curr = nil
    sinks = Array.new
    pipe(cmd) { |l|
        next unless l=~/\s*(\*)?\s*index:\s+(\d+)/
        i = $2.to_i
        sinks.push(i)
        curr = i if $1
    }
    return sinks,curr
end

##################################################
# Main code
##################################################
def main
    opt = parseArgs

    sinks,curr = getSinks

    usage("No sinks found?") if sinks.empty?
    usage("Only one sink found") if sinks.size==1

    if opt[:sink]
        usage("Unknown sink [#{opt[:sink]}] (out of #{sinks.join(' ')})") unless sinks.index(opt[:sink])
    else
        # Find next sink after curr
        opt[:sink] = sinks[0]
        sinks.each { |s|
            next unless s>curr
            opt[:sink] = s
            break
        }
    end

    # Set default sink
## For some reason this doesn't change the behavior of new apps.
    puts "Set sink: #{opt[:sink]}"
    system("#{PACMD} set-default-sink #{opt[:sink]} > /dev/null")
    usage("Couldn't set default sink [#{opt[:sink]}]") unless $?==0

    # And move all sink-inputs to the new sink
    ins,ignore = getSinks(true)
    ins.each { |i|
        puts "Move playback #{i} to sink #{opt[:sink]}"
        system("#{PACMD} move-sink-input #{i} #{opt[:sink]} > /dev/null")
        usage("Couldn't move playback #{i} to sink [#{opt[:sink]}]") unless $?==0
    }
end
main
  • 1
    Welcome to Ask Ubuntu! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. – ζ-- Nov 6 '12 at 21:12
  • Done, though unfortunately this means the script doesn't get updated here unless I remember that it's here. As an example, ruby changed the way it handles .each for strings (in the backtick portion) so I needed to update line 53 above. Or just download the script to make sure it's up to date. – David Ljung Madison Mar 2 '16 at 0:11
1

Based on Gaco's answer, I rewrote it a bit for my personal use. Maybe someone finds it useful. It's for toggling my USB Speakers and USB Gaming headset.

#!/bin/bash

# get list of sinks/cards (for settings CARD1/CARD2)
# pacmd list-sinks | awk '/name:/ {print $0};' | awk '{ print $2}' | sed 's/<//g; s/>//g'

CARD1="alsa_output.usb-C-Media_INC._C-Media_USB_Audio-00"
CARD2="alsa_output.usb-Kingston_HyperX_Virtual_Surround_Sound_00000000-00"

CURRENT_SINK=$(pacmd stat | awk -F": " '/^Default sink name: /{print $2}' | awk 'BEGIN{FS=OFS="."} NF--' | sed 's/alsa_output/alsa_output/g')


function setCard() {

  if [ "$CURRENT_SINK" == "$1" ]
   then
     echo "Already using this Sink"
     exit 1
  fi

  NEW_SINK=$(pacmd list-sinks | awk '/index:/ {print $1 $2 $3} /name:/ {print $0};' | grep -m1 -B1 $1 | grep index | awk '{print $1}' | cut -d ":" -f2)
  SINK=$(pacmd set-default-sink $NEW_SINK)
  INPUT=$(pacmd list-sink-inputs | grep index | awk '{print $2}')

  pacmd move-sink-input $INPUT $NEW_SINK
  echo "Moving input: $INPUT to sink: $NEW_SINK";
  echo "Setting default sink to: $NEW_SINK";

  notify-send --urgency=low "Audio Switching" "SINK: $NEW_SINK"
}

function toggleSinks() {
  if [ "$CURRENT_SINK" == "$CARD1" ]
    then
      setCard $CARD2
    else
      setCard $CARD1
    fi
}


function showHelp() {
  echo "------------------------------------"
  echo "AUDIO SINK SWITCHER"
  echo " "
  echo "$0 [options]"
  echo " "
  echo "options:"
  echo "-h  --help        What you are looking at.."
  echo "-g, --gaming      Sets Gaming headset as output device"
  echo "-s, --speakers    Sets Speakers as output device"
  echo "-t, --toggle      Toggles the different output devices"
  echo " "
  echo "------------------------------------"
}

# check args length
if [ $# -eq 0 ]
  then
    echo "Toggling output devices (Speakers/Headset)"
    toggleSinks
fi


# arg options
while test $# -gt 0; do
    case "$1" in

                -h|--help)
                        showHelp
                        exit 1
                        ;;

                -g|--gaming)
                        setCard $CARD2
                        exit 1
                        ;;

                -s|--speakers)
                        setCard $CARD1
                        exit 1
                        ;;

                -t|--toggle)
                        toggleSinks
                        echo "Toggling output devices (Speakers/Headset)"
                        exit 1
                        ;;
                 *)
                        showHelp
                        exit 1
                        ;;
    esac
done
0

I think there is one more option worth mentioning and it's available at the official page for FAQ about PulseAudio at freedesktop.org. Under the following Title:

How do I switch the default sound card, moving all applications?

They provide the following script to do so:

#/bin/bash
# paswitch 2011-02-02 by Ng Oon-Ee <ngoonee@gmail.com>
# I can't remember where I found this script, can't locate the original author.
# Please inform me if you know, so that I can give proper attribution.
# CHANGES: Added auto-move all inputs to new default sound card.
# WAS: Pulse Audio Sound Card Switcher v1.0 2010-01-13
#   Switches between soundcards when run. All streams are moved to the new default sound-card.

# $totalsc: Number of sound cards available
totalsc=$(pacmd "list-sinks" | grep card: | wc -l) # total of sound cards: $totalsc
if [ $totalsc -le 1 ]; then # Check whether there are actually multiple cards available
  notify-send -u critical -t 5000 "Nothing to switch, system only has one sound card."
  exit
fi
# $scindex: The Pulseaudio index of the current default sound card
scindex=$(pacmd list-sinks | awk '$1 == "*" && $2 == "index:" {print $3}')
# $cards: A list of card Pulseaudio indexes
cards=$(pacmd list-sinks | sed 's|*||' | awk '$1 == "index:" {print $2}')
PICKNEXTCARD=1 # Is true when the previous card is default
count=0 # count of number of iterations
for CARD in $cards; do
  if [ $PICKNEXTCARD == 1 ]; then
# $nextsc: The pulseaudio index of the next sound card (to be switched to)
    nextsc=$CARD
    PICKNEXTCARD=0
# $nextind: The numerical index (1 to totalsc) of the next card
    nextind=$count
  fi
  if [ $CARD == $scindex ]; then # Choose the next card as default
    PICKNEXTCARD=1
  fi
  count=$((count+1))
done
pacmd "set-default-sink $nextsc" # switch default sound card to next

# $inputs: A list of currently playing inputs
inputs=$(pacmd list-sink-inputs | awk '$1 == "index:" {print $2}')
for INPUT in $inputs; do # Move all current inputs to the new default sound card
  pacmd move-sink-input $INPUT $nextsc
done
# $nextscdec: The device.description of the new default sound card
# NOTE: This is the most likely thing to break in future, the awk lines may need playing around with
nextscdesc=$(pacmd list-sinks | awk '$1 == "device.description" {print substr($0,5+length($1 $2))}' \
                         | sed 's|"||g' | awk -F"," 'NR==v1{print$0}' v1=$((nextind+1)))
notify-send "Default sound-card changed to $nextscdesc"
exit
# Below text was from original author and remains unaltered
# CC BY - creative commons
# Thanks God for help :) and guys lhunath, geirha, Tramp and others from irc #bash on freenode.net
0

I adapted @mpapis to a simple "toggle sink0 or sink1" when run:

#!/bin/bash
SINK_INDEX1=0
SINK_INDEX2=1
ACTIVE_SINK=$(pacmd list-sinks | grep '* index:' | grep -o '[0-9]*')
if [ "$ACTIVE_SINK" = $SINK_INDEX1 ] ; then
    pacmd set-default-sink $SINK_INDEX2
    pacmd list-sink-inputs | awk '/index:/{print $2}' | xargs -r -I{} pacmd move-sink-input {} $SINK_INDEX2
else 
    pacmd set-default-sink $SINK_INDEX1
    pacmd list-sink-inputs | awk '/index:/{print $2}' | xargs -r -I{} pacmd move-sink-input {} $SINK_INDEX1
fi

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.