Audio test: Difference between revisions
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(Created page with "{{PageHeader|DART-6UL/VAR-SOM-MX7 - Audio Record/Play}} {{DocImage|category1=Yocto|category2=Debian}} Category:DART-6UL Category:VAR-SOM-MX7 __toc__ = Get Information on the Sound Cards = == Installed Sound Cards == To check the installed devices for different codecs, use: <pre> # cat /proc/asound/cards </pre> Example outputs: * WM8731 codec: <pre> 0 [wm8731audio ]: wm8731-audio - wm8731-audio wm8731-audio </pre> * WM8904 codec:...") |
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== Headphone DAC Gain (WM8731) and Output Control (WM8904) == | == Headphone DAC Gain (WM8731) and Output Control (WM8904) == | ||
For WM8731, the HP DAC gain is set using `'Capture'` (range | For WM8731, the HP DAC gain is set using `'Capture'` (range 0 - 118 for 0-100%). | ||
For WM8904, the Headphone and Line Output volume can be controlled with: | For WM8904, the Headphone and Line Output volume can be controlled with: | ||
| Line 297: | Line 297: | ||
= Save / Restore System's Audio Settings = | = Save / Restore System's Audio Settings = | ||
The `alsactl` command can be used to | The `alsactl` command can be used to save and restore all ALSA mixer settings. This works for any supported audio codec, including WM8731 and WM8904. | ||
To save the current ALSA configuration: | To save the current ALSA configuration: | ||
| Line 310: | Line 310: | ||
# alsactl restore -f 123.conf | # alsactl restore -f 123.conf | ||
</pre> | </pre> | ||
This allows that audio settings remain persistent across reboots or resets. | |||
== Options == | == Options == | ||
| Line 318: | Line 320: | ||
restore <card> Load the saved driver setup from a configuration file. | restore <card> Load the saved driver setup from a configuration file. | ||
</pre> | </pre> | ||
Latest revision as of 18:41, 6 February 2025
DART-6UL/VAR-SOM-MX7 - Audio Record/Play
Get Information on the Sound Cards
Installed Sound Cards
To check the installed devices for different codecs, use:
# cat /proc/asound/cards
Example outputs:
- WM8731 codec:
0 [wm8731audio ]: wm8731-audio - wm8731-audio
wm8731-audio
- WM8904 codec:
0 [wm8904audio ]: simple-card - wm8904-audio
wm8904-audio
List Available Playback Devices
To list playback device names, use:
# aplay -L
Example outputs:
- WM8731 codec:
null
Discard all samples (playback) or generate zero samples (capture)
sysdefault:CARD=wm8731audio
wm8731-audio,
Default Audio Device
- WM8904 codec:
null
Discard all samples (playback) or generate zero samples (capture)
sysdefault:CARD=wm8904audio
wm8904-audio, 308a0000.sai-wm8904-hifi wm8904-hifi-0
Default Audio Device
Audio Playback
Set PCM Volume
The main volume of the audio codec can be adjusted using `amixer`. The volume range varies by codec:
- WM8731 codec: `0-127`
- WM8904 codec: `0-63`
To set the maximum volume for each codec, use:
# amixer set Master 127 # For WM8731 # amixer set Headphone 63 # For WM8904
For WM8731, also enable the output mixer:
# amixer set 'Output Mixer HiFi' on
Play Audio
To play a sample audio file:
# aplay /usr/share/sounds/alsa/Front_Center.wav
Example Outputs
- WM8731 codec:
# amixer set Master 125 Simple mixer control 'Master',0 Capabilities: pvolume Playback channels: Front Left - Front Right Limits: Playback 0 - 127 Mono: Front Left: Playback 125 [98%] [4.00dB] Front Right: Playback 125 [98%] [4.00dB] # aplay /usr/share/sounds/alsa/Front_Center.wav Playing WAVE '/usr/share/sounds/alsa/Front_Center.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono
- WM8904 codec:
# amixer set Headphone 63 Simple mixer control 'Headphone',0 Capabilities: volume pswitch Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: 0 - 63 Front Left: 63 [100%] [6.00dB] Playback [on] Front Right: 63 [100%] [6.00dB] Playback [on] # aplay /usr/share/sounds/alsa/Front_Center.wav Playing WAVE '/usr/share/sounds/alsa/Front_Center.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono
Audio Record and Play (Line-in Jack)
Set Capture Volume
To adjust the recording volume, use:
- WM8731 codec:
# amixer set 'Capture' 22
- WM8904 codec:
# amixer set 'Capture' 31
Record and Playback Audio
To record 10 seconds of audio and play it back:
# arecord -f cd -d 10 test.wav # aplay test.wav
Example Outputs
- WM8731 codec:
# arecord -f cd -d 10 test.wav Recording WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo # aplay test.wav Playing WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
- WM8904 codec:
# arecord -f cd -d 10 test.wav Recording WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo # aplay test.wav Playing WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
Advanced Controls
Running `amixer` without parameters will show all available controls.
For example:
- WM8731 codec:
# amixer Simple mixer control 'Master',0 Capabilities: pvolume Playback channels: Front Left - Front Right Limits: Playback 0 - 127 Mono: Front Left: Playback 125 [98%] [4.00dB] Front Right: Playback 125 [98%] [4.00dB] ... Simple mixer control 'Capture',0 Capabilities: cvolume Capture channels: Front Left - Front Right Limits: Capture 0 - 31 Front Left: Capture 31 [100%] [12.00dB] Front Right: Capture 31 [100%] [12.00dB] ...
- WM8904 codec:
# amixer Simple mixer control 'Headphone',0 Capabilities: volume pswitch Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: 0 - 63 Front Left: 63 [100%] [6.00dB] Playback [on] Front Right: 63 [100%] [6.00dB] Playback [on] ... Simple mixer control 'Capture',0 Capabilities: cvolume cswitch Capture channels: Front Left - Front Right Limits: Capture 0 - 31 Front Left: Capture 31 [100%] [on] Front Right: Capture 31 [100%] [on] ...
Get and Set Control Values
Use the following commands to check and adjust mixer controls:
amixer sset sID P # Set contents for one mixer simple control amixer sget sID # Get contents for one mixer simple control
Example: Checking Capture Volume
- WM8731 codec:
# amixer sget 'Capture' Simple mixer control 'Capture',0 Capabilities: cvolume Capture channels: Front Left - Front Right Limits: Capture 0 - 31 Front Left: Capture 31 [100%] [12.00dB] Front Right: Capture 31 [100%] [12.00dB]
- WM8904 codec:
# amixer sget 'Capture' Simple mixer control 'Capture',0 Capabilities: cvolume cswitch Capture channels: Front Left - Front Right Limits: Capture 0 - 31 Front Left: Capture 31 [100%] [on] Front Right: Capture 31 [100%] [on]
Example: Setting Capture Volume to 81%
- WM8731 codec:
# amixer sset 'Capture' 25 Simple mixer control 'Capture',0 Capabilities: cvolume Capture channels: Front Left - Front Right Limits: Capture 0 - 31 Front Left: Capture 25 [81%] [3.00dB] Front Right: Capture 25 [81%] [3.00dB]
- WM8904 codec:
# amixer sset 'Capture' 25 Simple mixer control 'Capture',0 Capabilities: cvolume cswitch Capture channels: Front Left - Front Right Limits: Capture 0 - 31 Front Left: Capture 25 [81%] [on] Front Right: Capture 25 [81%] [on]
Headphone DAC Gain (WM8731) and Output Control (WM8904)
For WM8731, the HP DAC gain is set using `'Capture'` (range 0 - 118 for 0-100%).
For WM8904, the Headphone and Line Output volume can be controlled with:
# amixer sset 'Headphone' 63 # 100% volume # amixer sset 'Line Output' 57 # 90% volume
Example output:
# amixer sget 'Headphone' Simple mixer control 'Headphone',0 Capabilities: volume pswitch Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: 0 - 63 Front Left: 63 [100%] [6.00dB] Playback [on] Front Right: 63 [100%] [6.00dB] Playback [on]
Save / Restore System's Audio Settings
The `alsactl` command can be used to save and restore all ALSA mixer settings. This works for any supported audio codec, including WM8731 and WM8904.
To save the current ALSA configuration:
# alsactl store -f 123.conf
To restore a previously saved configuration:
# alsactl restore -f 123.conf
This allows that audio settings remain persistent across reboots or resets.
Options
store <card> Save current driver setup for one or all sound cards
to a configuration file.
restore <card> Load the saved driver setup from a configuration file.