{"id":307,"date":"2018-03-18T16:14:08","date_gmt":"2018-03-18T16:14:08","guid":{"rendered":"https:\/\/geekblog.febo.com\/wp\/?p=307"},"modified":"2018-03-18T19:18:06","modified_gmt":"2018-03-18T19:18:06","slug":"add-streaming-audio-to-op25-rpi-scanner","status":"publish","type":"post","link":"https:\/\/blog.febo.com\/?p=307","title":{"rendered":"Add streaming audio to OP25 RPi scanner"},"content":{"rendered":"

Thanks to Graham Norbury<\/A>, here is how to set up a Raspberry Pi OP25 scanner to stream audio to an icecast or other streaming server. I have updated my plug-and-play op25-rpi.img<\/code> image at http:\/\/febo.com\/os_images\/<\/A> to include this capability (look for the 2018-03-18_op25_rpi.zip or later-dated file).<\/p>\n

1. Copy the following into a new file \/etc\/asound.conf on the Raspberry Pi (you’ll need to do this as root):<\/p>\n


\n# output device
\npcm.loopout {
\n type dmix
\n ipc_key 328211
\n slave.pcm \"hw:Loopback,0,0\"
\n}<\/p>\n

# input device
\npcm.loopin {
\n type dsnoop
\n ipc_key 686592
\n slave.pcm \"hw:Loopback,1,0\"
\n}<\/p>\n

# duplex plug device
\npcm.loop {
\n type plug
\n slave {
\n pcm {
\n type asym
\n playback.pcm \"loopout\"
\n capture.pcm \"loopin\"
\n }
\n }
\n}<\/p>\n

pcm.mout {
\n type plug
\n slave.pcm mdev
\n route_policy \"duplicate\"
\n}<\/p>\n

pcm.mdev {
\n type multi<\/p>\n

slaves.a.pcm \"hw:Loopback,0,0\"
\n slaves.a.channels 2
\n slaves.b.pcm \"hw:0,0\"
\n slaves.b.channels 2<\/p>\n

bindings.0.slave a
\n bindings.0.channel 0
\n bindings.1.slave a
\n bindings.1.channel 1
\n bindings.2.slave b
\n bindings.2.channel 0
\n bindings.3.slave b
\n bindings.3.channel 1
\n}
\n<\/code><\/p>\n

2. Copy the following into a new file \/etc\/modprobe.d\/alsa-loop.conf on the Raspberry Pi (again, as root):
\n
\nsoftdep snd-bcm2835 post: snd-aloop
\n<\/code><\/p>\n

3. Add “-O mout” to the rx.py command line.<\/p>\n

4. Install darkice on the Raspberry Pi:
\n
\nsudo apt-get install darkice
\n<\/code><\/p>\n

5. Copy the following into a new file \/etc\/darkice.cfg on the Raspberry Pi (once again, as root), and replacing the password, server name, etc. with your local info:
\n
\n# sample DarkIce configuration file, edit for your needs before using
\n# see the darkice.cfg man page for details<\/p>\n

# this section describes general aspects of the live streaming session
\n[general]
\nduration = 0 # duration of encoding, in seconds. 0 means forever
\nbufferSecs = 5 # size of internal slip buffer, in seconds
\nreconnect = yes # reconnect to the server(s) if disconnected
\nrealtime = yes # run the encoder with POSIX realtime priority
\nrtprio = 3 # scheduling priority for the realtime threads<\/p>\n

# this section describes the audio input that will be streamed
\n[input]
\ndevice = loop # OSS DSP soundcard device for the audio input
\nsampleRate = 11025 # sample rate in Hz. try 11025, 22050 or 44100
\nbitsPerSample = 16 # bits per sample. try 16
\nchannel = 1 # channels. 1 = mono, 2 = stereo<\/p>\n

# this section describes a streaming connection to an IceCast2 server
\n# there may be up to 8 of these sections, named [icecast2-0] ... [icecast2-7]
\n# these can be mixed with [icecast-x] and [shoutcast-x] sections
\n[icecast2-0]
\nbitrateMode = abr # average bit rate
\nformat = vorbis # format of the stream: ogg vorbis
\nbitrate = 96 # bitrate of the stream sent to the server
\nserver = MY_ICECAST_SERVER
\n # host name of the server
\nport = 8000 # port of the IceCast2 server, usually 8000
\npassword = MY_ICECAST_PASSWORD # source password to the IceCast2 server
\nmountPoint = op25.ogg # mount point of this stream on the IceCast2 server
\nname = OP25 Scanner
\n # name of the stream
\ndescription = OP 25 Scanner listening to MY_SYSTEM
\n # description of the stream
\nurl = http:\/\/MY_URL.com
\n # URL related to the stream
\ngenre = Public Safety # genre of the stream
\npublic = yes # advertise this stream?
\nlocalDumpFile\t= dump.ogg # local dump file
\n<\/code><\/p>\n

6. Note that this version of darkice does *not* support mp3 format; to get that you will need to compile from source, and I’m not going to go into that here.<\/p>\n

7. Darkice can stream to an external site like Broadcastify<\/A> though I am using mine to stream to a local Icecast<\/A> server for consumption on my local network.<\/p>\n","protected":false},"excerpt":{"rendered":"

Thanks to Graham Norbury, here is how to set up a Raspberry Pi OP25 scanner to stream audio to an icecast or other streaming server. I have updated my plug-and-play…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","ngg_post_thumbnail":0,"footnotes":""},"categories":[33,9],"tags":[37,31,29],"class_list":["post-307","post","type-post","status-publish","format-standard","hentry","category-rapsberry-pi","category-sdr","tag-op25","tag-rtl-sdr","tag-scanner"],"_links":{"self":[{"href":"https:\/\/blog.febo.com\/index.php?rest_route=\/wp\/v2\/posts\/307","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.febo.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.febo.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.febo.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.febo.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=307"}],"version-history":[{"count":5,"href":"https:\/\/blog.febo.com\/index.php?rest_route=\/wp\/v2\/posts\/307\/revisions"}],"predecessor-version":[{"id":313,"href":"https:\/\/blog.febo.com\/index.php?rest_route=\/wp\/v2\/posts\/307\/revisions\/313"}],"wp:attachment":[{"href":"https:\/\/blog.febo.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=307"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.febo.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=307"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.febo.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=307"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}