This documentation deals with the special configuration needed for get kalliope working on a RPi.
On a Raspberry Pi, pulseaudio is not installed by default
sudo apt-get install pulseaudio pulseaudio-utils
Start the pulseaudio server
pulseaudio -D
Get your output card
aplay -l
Output example with a USB headset connected
**** List of PLAYBACK Hardware Devices ****
card 0: ALSA [bcm2835 ALSA], device 0: bcm2835 ALSA [bcm2835 ALSA]
Subdevices: 7/8
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
Subdevice #2: subdevice #2
Subdevice #3: subdevice #3
Subdevice #4: subdevice #4
Subdevice #5: subdevice #5
Subdevice #6: subdevice #6
Subdevice #7: subdevice #7
card 0: ALSA [bcm2835 ALSA], device 1: bcm2835 ALSA [bcm2835 IEC958/HDMI]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: Headset [Logitech USB Headset], device 0: USB Audio [USB Audio]
Subdevices: 0/1
Subdevice #0: subdevice #0
Here, we can see that we have
Get your input (microphone card)
arecord -l
Output example with a USB headset connected
**** List of CAPTURE Hardware Devices ****
card 1: Headset [Logitech USB Headset], device 0: USB Audio [USB Audio]
Subdevices: 0/1
Subdevice #0: subdevice #0
Here we can see that we have one peripheral on card 1 and device 0
Now, we create a configuration file that will do apply the following configuration:
Create a file in /home/pi/.asoundrc
with the content bellow
pcm.!default {
type asym
playback.pcm {
type plug
slave.pcm "hw:1,0"
}
capture.pcm {
type plug
slave.pcm "hw:1,0"
}
}
Where playback.pcm
is the output audio and the capture.pcm
is the input audio.
Restart alsa to apply changes
sudo /etc/init.d/alsa-utils restart
Do not forget to test recording your voice:
Capture audio from your microphone
rec test.wav
Then play the recorded audio file
mplayer test.wav