Difference between revisions of "Transclusion: Debian: CL-SOM-iMX7: Analog Audio"
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| − | CL-SOM-iMX7 provides an analog audio interface, which is registered as a standard ALSA sound card. | + | <!--CL-SOM-iMX7 provides an analog audio interface, which is registered as a standard ALSA sound card. |
Use {{cmd|aplay -l}} to list all soundcards and digital audio devices registered on the system: | Use {{cmd|aplay -l}} to list all soundcards and digital audio devices registered on the system: | ||
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Subdevice #0: subdevice #0 | Subdevice #0: subdevice #0 | ||
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==== Analog Audio Settings ==== | ==== Analog Audio Settings ==== | ||
Revision as of 11:24, 14 June 2017
Contents
Analog Audio Settings
To enable the Analog audio playback, alsamixer or amixer applications can be used.
- alsamixer - set the “Output Mixer HiFi” control on.
or
- amixer - set the “Output Mixer HiFi Playback Switch” control on using command line interface:
root@cl-rootfs:~# amixer cset numid=14 1 numid=14,iface=MIXER,name='Output Mixer HiFi Playback Switch' ; type=BOOLEAN,access=rw------,values=1 : values=on
Analog Audio Playback
In order to play back a sound file make use of the aplay application.
- aplay -L can be used for listing of all pcm devices.
Here is a sample output of aplay -L command:
root@cl-rootfs:~# aplay -L
null
Discard all samples (playback) or generate zero samples (capture)
default:CARD=clsomimx7
cl-som-imx7,
Default Audio Device
sysdefault:CARD=clsomimx7
cl-som-imx7,
Default Audio Device
dmix:CARD=clsomimx7,DEV=0
cl-som-imx7,
Direct sample mixing device
dsnoop:CARD=clsomimx7,DEV=0
cl-som-imx7,
Direct sample snooping device
hw:CARD=clsomimx7,DEV=0
cl-som-imx7,
Direct hardware device without any conversions
plughw:CARD=clsomimx7,DEV=0
cl-som-imx7,
Hardware device with all software conversions
The next command can be used for audio play back:
root@cl-rootfs:~# aplay <wav-file>
Audio Input Settings
CL-SOM-iMX7 provides an audio capturing feature from either Mic or Line In input sources. alsamixer or amixer can be used in order to switch between these inputs.
Mic
- alsamixer
- Capture Volume => 100
- Line Capture Switch => off
- Mic Capture Switch => on
- Input Mux => Mic
- amixer
amixer cset numid=3 31 amixer cset numid=4 0 amixer cset numid=6 1 amixer cset numid=11 1
Line In
- alsamixer
- Capture Volume => 100
- Line Capture Switch => on
- Mic Capture Switch => off
- Input Mux => Line In
- amixer
amixer cset numid=3 31 amixer cset numid=4 1 amixer cset numid=6 0 amixer cset numid=11 0
Sample Audio Recording
As soon as the correct input values have been set, audio signal can be captured. Here is a sample command that shows the arecord usage for capturing audio signal from the selected input line.
root@cl-rootfs:~# arecord -f dat -t wav /tmp/out.wav
