{"id":2503,"date":"2016-05-05T14:28:44","date_gmt":"2016-05-05T14:28:44","guid":{"rendered":"http:\/\/blog.designed79.co.uk\/?p=2503"},"modified":"2016-05-11T13:38:48","modified_gmt":"2016-05-11T13:38:48","slug":"raspberry-pi-bluetooth-speaker","status":"publish","type":"post","link":"https:\/\/blog.designed79.co.uk\/?p=2503","title":{"rendered":"Raspberry Pi Bluetooth Speaker"},"content":{"rendered":"

Raspbian Wheezy Installation Guide<\/p>\n

From a fresh installation of Wheezyrun the following as the default user pi:<\/p>\n

pi@raspberrypi ~ $ sudo apt-get install bluez pulseaudio-module-bluetooth python-gobject python-gobject-2 alsa-utils<\/div><\/div>\n

Add the user pi to the group lp. This is so the user pi can get access to the bluetooth daemon. If this isn’t done, the bluez source will not show up in pulse audio.<\/p>\n

pi@raspberrypi ~ $ sudo usermod -a -G lp pi<\/div><\/div>\n

The bluetooth stack has to be configured for A2DP.<\/p>\n

pi@raspberrypi ~ $ sudo nano \/etc\/bluetooth\/audio.conf<\/div><\/div>\n

Add the following line after [General]:<\/p>\n

Enable=Source,Sink,Media,Socket<\/div><\/div>\n

Change the resampling algorithm for pulse audio<\/p>\n

pi@raspberrypi ~ $ sudo nano \/etc\/pulse\/daemon.conf<\/div><\/div>\n
; resample-method = speex-float-3
\nresample-method = trivial ; ADD THIS LINE<\/div><\/div>\n

Reboot at this point!<\/p>\n

pi@raspberrypi ~ $ sudo reboot<\/div><\/div>\n

NOTE: Do not run these with sudo… Run as pi! <\/p>\n

Boot up, log-in, and run:<\/p>\n

pi@raspberrypi ~ $ sudo hciconfig hci0 piscan<\/div><\/div>\n

Makes the Pi BT discoverable<\/p>\n

pi@raspberrypi ~ $ bluez-simple-agent<\/div><\/div>\n

Connect with your smart phone and enter pin \/ authorize.
\nAfter authorization is complete, CTRL-C out.<\/p>\n

You can then trust the phone by using the command:<\/p>\n

pi@raspberrypi ~ $ bluez-test-device trusted B8:C6:8E:52:E8:CA yes<\/div><\/div>\n

It shouldn’t ask for a pin in the future…<\/p>\n

After the phone is connected, list the sources. A bluez source should show up:
\nNote: This command will start the PulseAudio daemon in per-user mode if it is not already running!<\/p>\n

pi@raspberrypi ~ $ pactl list sources short
\n
\n0    alsa_output.platform-bcm2835_AUD0.0.analog-stereo.monitor    module-alsa-card.c    s16le 2ch 44100Hz    SUSPENDED
\n1    bluez_source.B8_C6_8E_52_E8_CA    module-bluetooth-device.c    s16le 2ch 44100Hz    SUSPENDED<\/div><\/div>\n

List the sinks. An ALSA sink for the BCM codec should show up:<\/p>\n

pi@raspberrypi ~ $ pactl list sinks short
\n
\n0    alsa_output.platform-bcm2835_AUD0.0.analog-stereo    module-alsa-card.c    s16le 2ch 44100Hz    SUSPENDED<\/div><\/div>\n

Connect the source to the sink manaual as a test:<\/p>\n

pi@raspberrypi ~ $ pactl load-module module-loopback source=bluez_source.B8_C6_8E_52_E8_CA sink=alsa_output.platform-bcm2835_AUD0.0.analog-stereo<\/div><\/div>\n

If you play the song on the phone, it should be played on the connected speakers. If not, maybe the default output isn’t the line out jack or the volume is muted or too low.<\/p>\n

The audio defaults to the HDMI output. I wanted it to play over the headphone jack.
\nHere is the command to set the source to headphone jack:<\/p>\n

pi@raspberrypi ~ $ amixer cset numid=3 1<\/div><\/div>\n

turn up the ALSA volume:<\/p>\n

pi@raspberrypi ~ $ amixer set Master 100%<\/div><\/div>\n

Also turn up the PulseAudio volume:<\/p>\n

pi@raspberrypi ~ $ pacmd set-sink-volume 0 65537<\/div><\/div>\n

The 0 is the sink channel number for alsa_output.platform-bcm2835_AUD0.0.analog-stereo as found with the command: “pactl list sinks short”.<\/p>\n

Script to automate this when a bluetooth device attaches<\/p>\n

To trigger the udev script when a new device connects create (or modify) an even handler in \/etc\/udev\/rules.d\/99-input.rules adding the following content rules<\/p>\n

SUBSYSTEM="input", GROUP="input", MODE="0660"
\nKERNEL=="input[0-9]*", RUN+="\/usr\/lib\/udev\/bluetooth"<\/div><\/div>\n

Now let\u2019s actually save that script that the above rule file is referencing. First check to see if a udev\/ directory exists. Do sudo ls \u2013la \/usr\/lib\/udev . If it doesn\u2019t exist go ahead and create it like so: sudo mkdir \/usr\/lib\/udev<\/p>\n

sudo nano \/usr\/lib\/udev\/bluetooth<\/div><\/div>\n
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<\/div><\/td>
#!\/bin\/bash<\/span>
\n# This script belongs in \/usr\/lib\/udev\/bluetooth and should be executable<\/span>
\n
\n#PA_SINK='alsa_output.platform-bcm2835_AUD0.0.analog-stereo'<\/span>
\n#Change SINK to 0 as name of sink changes on hardware change. 0 Is default<\/span>
\nPA_SINK<\/span>=0<\/span>
\nLOG_FILE<\/span>=\/<\/span>var\/<\/span>log\/<\/span>bluetooth_a2dp
\nMAC<\/span>=$(<\/span>echo<\/span> "$NAME<\/span>"<\/span> |<\/span> sed<\/span> 's\/:\/_\/g'<\/span> |<\/span> sed<\/span> 's\/"\/\/g'<\/span>)<\/span>
\n
\n# Set the user you want to run as, 'pi' would be fine for most.<\/span>
\nBT_USER<\/span>=pi
\n
\nfunction<\/span> checkSource {<\/span>
\n    # Get the current sources<\/span>
\n    local<\/span> _sources<\/span>=$(<\/span>sudo<\/span> -u<\/span> "$BT_USER<\/span>"<\/span> pactl list sources short)<\/span>
\n
\n    # Check if any sources are currently running <\/span>
\n    # and that our new device is valid.<\/span>
\n    if<\/span> [<\/span>[<\/span> !<\/span> "$_sources<\/span>"<\/span> =~ RUNIING ]<\/span>]<\/span> &&<\/span> [<\/span>[<\/span> "$_sources<\/span>"<\/span> =~ "$1"<\/span> ]<\/span>]<\/span> ; then<\/span>
\n        echo<\/span> "Validated new source: $1"<\/span> >><\/span> "$LOG_FILE<\/span>"<\/span>
\n        echo<\/span> "$1"<\/span>
\n    fi<\/span>
\n}<\/span>
\n
\nfunction<\/span> setVolume {<\/span>
\n    # Set our volume to max<\/span>
\n    sudo<\/span> -u<\/span> "$BT_USER<\/span>"<\/span> pacmd set-sink-volume 0<\/span> 65537<\/span>
\n    sudo<\/span> -u<\/span> "$BT_USER<\/span>"<\/span> amixer set<\/span> Master 100<\/span>%<\/span>
\n}<\/span>
\n
\nfunction<\/span> connect {<\/span>
\n    # Connect source to sink<\/span>
\n    sudo<\/span> -u<\/span> "$BT_USER<\/span>"<\/span> pactl load-module module-loopback \\
\n    source<\/span>="$1"<\/span> sink<\/span>="$PA_SINK<\/span>"<\/span> rate<\/span>=44100<\/span> adjust_time<\/span>=0<\/span>
\n}<\/span>
\n
\necho<\/span> "Change for device $MAC<\/span> detected, running $ACTION<\/span>"<\/span> >><\/span> "$LOG_FILE<\/span>"<\/span>
\n
\nif<\/span> [<\/span> "$ACTION<\/span>"<\/span> = "add"<\/span> ]<\/span>
\nthen<\/span>
\n    incoming<\/span>=bluez_source."$MAC<\/span>"<\/span>
\n    if<\/span> [<\/span> !<\/span> -z<\/span> $(<\/span>checkSource "$incoming<\/span>"<\/span>)<\/span> ]<\/span> ; then<\/span>
\n        connect "$incoming<\/span>"<\/span>
\n        setVolume
\n    fi<\/span>
\nfi<\/span><\/div><\/td><\/tr><\/tbody><\/table><\/div>\n

disable timeouts by adding a line in ‘\/etc\/pulse\/client.conf’<\/p>\n

extra-arguments = --exit-idle-time=-1 --log-target=syslog<\/div><\/div>\n

The Pi User has to be logged in for this to work. In a headless setup you can get the Pi to auto login by editing the \/etc\/inittab file and replacing the line<\/p>\n

1:2345:respawn:\/sbin\/getty 115200 tty1<\/div><\/div>\n

with<\/p>\n

1:2345:respawn:\/bin\/login -f pi tty1 \/dev\/tty1 2>&1<\/div><\/div>\n

Also forget about auto pairing, not going to happen. BLUEZ 4 onwards disabled this as a security measure. Your gonna have to SSH in and pair your devices<\/p>\n","protected":false},"excerpt":{"rendered":"

Raspbian Wheezy Installation Guide From a fresh installation of Wheezyrun the following as the default user pi: pi@raspberrypi ~ $ sudo apt-get […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2503","post","type-post","status-publish","format-standard","hentry","category-info-on-tech"],"_links":{"self":[{"href":"https:\/\/blog.designed79.co.uk\/index.php?rest_route=\/wp\/v2\/posts\/2503","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.designed79.co.uk\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.designed79.co.uk\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.designed79.co.uk\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.designed79.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2503"}],"version-history":[{"count":0,"href":"https:\/\/blog.designed79.co.uk\/index.php?rest_route=\/wp\/v2\/posts\/2503\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.designed79.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2503"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.designed79.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2503"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.designed79.co.uk\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2503"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}