Difference between revisions of "Transclusion: Debian: CL-SOM-iMX7: Analog Audio"
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| − | + | Use {{cmd|aplay -l}} to list all sound cards and digital audio devices registered on the system: | |
| − | Use {{cmd|aplay -l}} to list all | ||
<pre> | <pre> | ||
root@cl-rootfs:~# aplay -l | root@cl-rootfs:~# aplay -l | ||
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Subdevices: 1/1 | Subdevices: 1/1 | ||
Subdevice #0: subdevice #0 | Subdevice #0: subdevice #0 | ||
| − | </pre | + | </pre> |
==== Analog Audio Playback ==== | ==== Analog Audio Playback ==== | ||
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The next command can be used for audio play back: | The next command can be used for audio play back: | ||
<pre> | <pre> | ||
| − | root@cl-rootfs:~# aplay <wav-file> | + | root@cl-rootfs:~# aplay -D sysdefault <wav-file> |
</pre> | </pre> | ||
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* {{cmd|amixer}} | * {{cmd|amixer}} | ||
<pre> | <pre> | ||
| − | amixer cset numid=3 31 | + | amixer cset numid=1 65536 |
| − | amixer cset numid=4 0 | + | amixer -c 0 cset numid=3 31,31 |
| − | amixer cset numid=6 1 | + | amixer -c 0 cset numid=4 0 |
| − | amixer cset numid= | + | amixer -c 0 cset numid=6 1 |
| + | amixer -c 0 cset numid=14 1 | ||
</pre> | </pre> | ||
===== Line In ===== | ===== Line In ===== | ||
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* {{cmd|amixer}} | * {{cmd|amixer}} | ||
<pre> | <pre> | ||
| − | amixer cset numid=3 31 | + | amixer cset numid=1 65536 |
| − | amixer cset numid=4 1 | + | amixer -c 0 cset numid=3 31 |
| − | amixer cset numid=6 0 | + | amixer -c 0 cset numid=4 1 |
| − | amixer cset numid= | + | amixer -c 0 cset numid=6 0 |
| + | amixer -c 0 cset numid=14 0 | ||
</pre> | </pre> | ||
| Line 78: | Line 79: | ||
Here is a sample command that shows the {{cmd|arecord}} usage for capturing audio signal from the selected input line. | Here is a sample command that shows the {{cmd|arecord}} usage for capturing audio signal from the selected input line. | ||
<pre> | <pre> | ||
| − | root@cl-rootfs:~# arecord -f dat -t wav /tmp/out.wav | + | root@cl-rootfs:~# arecord -D sysdefault -d 10 -f dat -t wav /tmp/out.wav |
</pre> | </pre> | ||
Latest revision as of 14:42, 4 December 2018
Use aplay -l to list all sound cards and digital audio devices registered on the system:
root@cl-rootfs:~# aplay -l **** List of PLAYBACK Hardware Devices **** card 0: clsomimx7 [cl-som-imx7], device 0: 308a0000.sai-wm8731-hifi wm8731-hifi-0 [] Subdevices: 1/1 Subdevice #0: subdevice #0
Contents
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 -D sysdefault <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=1 65536 amixer -c 0 cset numid=3 31,31 amixer -c 0 cset numid=4 0 amixer -c 0 cset numid=6 1 amixer -c 0 cset numid=14 1
Line In
- alsamixer
- Capture Volume => 100
- Line Capture Switch => on
- Mic Capture Switch => off
- Input Mux => Line In
- amixer
amixer cset numid=1 65536 amixer -c 0 cset numid=3 31 amixer -c 0 cset numid=4 1 amixer -c 0 cset numid=6 0 amixer -c 0 cset numid=14 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 -D sysdefault -d 10 -f dat -t wav /tmp/out.wav
