We will use an icecast server, to install it:
$ sudo apt-get install icecast2
Icecast2 server will broadcast the audio feed
And we need ffmpeg, which will stream audio cd to icecast2 feed:
$ sudo apt-get install ffmpeg
Some configuration, for icecast2: edit the /etc/icecast2/icecast.xml
file, and check the authentication part:
<authentication>
<!-- Sources log in with username 'source' -->
<source-password>YOUR_PASSWORD</source-password>
<!-- Relays log in with username 'relay' -->
<relay-password>YOUR_PASSWORD</relay-password>
<!-- Admin logs in with the username given below -->
<admin-user>admin</admin-user>
<admin-password>YOUR_PASSWORD</admin-password>
</authentication>
And the hostname and socket part:
<hostname>localhost</hostname>
<!-- You may have multiple <listener> elements -->
<listen-socket>
<port>8000</port>
<!-- <bind-address>127.0.0.1</bind-address> -->
<!-- <shoutcast-mount>/stream</shoutcast-mount> -->
</listen-socket>
You can see the full config file in the Chromecast-audio-cd-caster repo
To stream using ffmpeg, simply use:
/usr/bin/ffmpeg -f libcdio -ss 0 -i /dev/cdrom -acodec libmp3lame -ab 48k -bufsize 15 -ac 1 -content_type audio/mpeg -f mp3 icecast://source:YOUR_PASSWORD@192.168.0.31:8000/raspi
(Don't forget to replace 192.168.0.31 by your raspberry pi local ip)
You have now a feed readable from http://192.168.0.31:8000/raspi
To cast what you want to a chromecast, have a look on Pychromecast Of course, you need python3:
$ sudo apt-get install python3
And a tiny python script:
import time
import pychromecast
import urllib.request
stream_url = 'http://192.168.0.31:8000/raspi'
chromecasts = pychromecast.get_chromecasts()
cast = next(cc for cc in chromecasts if cc.device.friendly_name == "Salon")
cast.wait()
print(cast.device)
print(cast.status)
mc = cast.media_controller
while urllib.request.urlopen(stream_url).getcode() != 200:
print('Waiting for stream up')
time.sleep(1)
mc.play_media(stream_url, 'audio/mp3')
mc.block_until_active()
print(mc.status)
mc.play()
And ... it's a kind of magic:
$ /usr/bin/ffmpeg -f libcdio -ss 0 -i /dev/cdrom -acodec libmp3lame -ab 48k -bufsize 15 -ac 1 -content_type audio/mpeg -f mp3 icecast://source:SOURCE_PASSWORD@192.168.0.31:8000/raspi & /usr/bin/python3 /home/pi/audio/cast.py
We will use an udev rule, for example in a /etc/udev/rules.d/99-cd-audio-processing.rules
rule:
SUBSYSTEM=="block", KERNEL=="sr0", ACTION=="change", RUN+="/home/pi/audio/start-cd.sh &"
Reboot, and you're ready :)