Linux Audio record play: Difference between revisions
From Variscite Wiki
No edit summary |
(Update instructions to set L/R inverting mux) |
||
| (8 intermediate revisions by 3 users not shown) | |||
| Line 3: | Line 3: | ||
--> {{#lst:Yocto_Platform_Customization|{{#var:RELEASE_PARAM}}}} <!-- | --> {{#lst:Yocto_Platform_Customization|{{#var:RELEASE_PARAM}}}} <!-- | ||
--> {{#lst:B2QT_Platform_Customization|{{#var:RELEASE_PARAM}}}} <!-- | --> {{#lst:B2QT_Platform_Customization|{{#var:RELEASE_PARAM}}}} <!-- | ||
--> {{#lst:Debian_Platform_Customization|{{#var:RELEASE_PARAM}}}} <!-- | |||
--> {{#vardefine:SUPPORT_WM8904_DRC | <!-- | --> {{#vardefine:SUPPORT_WM8904_DRC | <!-- | ||
--> {{#switch:{{#var:HARDWARE_NAME}} | <!-- | --> {{#switch:{{#var:HARDWARE_NAME}} | <!-- | ||
| Line 9: | Line 10: | ||
--> }} <!-- | --> }} <!-- | ||
--> }} <!-- | --> }} <!-- | ||
# Add ARECORD_EXTRA_ARGS for AM62 | |||
# See: https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/08_06_00_42/exports/docs/linux/Foundational_Components/Kernel/Kernel_Drivers/Audio.html?highlight=arecord#potential-issues | |||
--> {{#switch: {{#var:SOC_SERIES}} | --> {{#switch: {{#var:SOC_SERIES}} | ||
| am6={{#vardefine: ARECORD_EXTRA_ARGS | -r 48000 --period-size=64}} | | am6={{#vardefine: ARECORD_EXTRA_ARGS | -r 48000 --period-size=64}} | ||
| Line 33: | Line 37: | ||
Default Audio Device | Default Audio Device | ||
</pre> | </pre> | ||
{{#varexists:DEBIAN_NAME| | |||
For the upcoming, the tool amixer is used to control the audio. Please consider stopping the PulseAudio server to avoid conflicts: | |||
# systemctl stop pulseaudio | |||
}} | |||
= Audio Playback = | = Audio Playback = | ||
Set PCM volume (main volume of audio codec), range :0-63 | Set PCM volume (main volume of audio codec), range :0-63 | ||
| Line 62: | Line 69: | ||
<pre> | <pre> | ||
# amixer set Headphone 35 | # amixer set Headphone 35 | ||
</pre> | |||
Set L/R capture inverting mux inputs to IN2 | |||
<pre> | |||
# amixer set 'Left Capture Inverting Mux' IN2L | |||
# amixer set 'Right Capture Inverting Mux' IN2R | |||
</pre> | </pre> | ||
Set capture input source to ADC | Set capture input source to ADC | ||
| Line 87: | Line 99: | ||
Front Left: 35 [56%] [-22.00dB] Playback [on] | Front Left: 35 [56%] [-22.00dB] Playback [on] | ||
Front Right: 35 [56%] [-22.00dB] Playback [on] | Front Right: 35 [56%] [-22.00dB] Playback [on] | ||
# amixer set 'Left Capture Inverting Mux' IN2L | |||
Simple mixer control 'Left Capture Inverting Mux',0 | |||
Capabilities: enum | |||
Items: 'IN1L' 'IN2L' 'IN3L' | |||
Item0: 'IN2L' | |||
# amixer set 'Right Capture Inverting Mux' IN2R | |||
Simple mixer control 'Right Capture Inverting Mux',0 | |||
Capabilities: enum | |||
Items: 'IN1R' 'IN2R' 'IN3R' | |||
Item0: 'IN2R' | |||
# amixer set 'Capture Input' ADC | # amixer set 'Capture Input' ADC | ||
Simple mixer control 'Capture Input',0 | Simple mixer control 'Capture Input',0 | ||
| Line 261: | Line 283: | ||
= Save/restore system's audio settings = | = Save/restore system's audio settings = | ||
alsactl store stores all alsamixer settings into a file<br> | alsactl store stores all alsamixer settings into a file.<br> | ||
Options: | Options: | ||
<pre> | <pre> | ||
Latest revision as of 15:47, 23 October 2023
Warning: This page is designed to be used with a 'release' URL parameter.
This page is using the default release RELEASE_SUMO_V1.0_DART-MX8M.
To view this page for a specific Variscite SoM and software release, please follow these steps:
- Visit variwiki.com
- Select your SoM
- Select the software release
DART-MX8M Audio Record/Play
Get information on the Sound Cards
Installed devices:
# cat /proc/asound/cards
0 [wm8904audio ]: wm8904-audio - wm8904-audio
wm8904-audio
List device names for playback:
# aplay -L
null
Discard all samples (playback) or generate zero samples (capture)
pulse
PulseAudio Sound Server
sysdefault:CARD=wm8904audio
wm8904-audio,
Default Audio Device
Audio Playback
Set PCM volume (main volume of audio codec), range :0-63
# amixer set Headphone 35
Play audio:
# aplay /usr/share/sounds/alsa/Front_Center.wav
Example:
# amixer set Headphone 35 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: 35 [56%] [-22.00dB] Playback [on] Front Right: 35 [56%] [-22.00dB] 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 PCM volume (main volume of audio codec), range :0-63
# amixer set Headphone 35
Set L/R capture inverting mux inputs to IN2
# amixer set 'Left Capture Inverting Mux' IN2L # amixer set 'Right Capture Inverting Mux' IN2R
Set capture input source to ADC
# amixer set 'Capture Input' ADC
Set DMIC Mux to DMIC2
# amixer set 'DMIC Mux' DMIC2
Record CD quality audio for 10 seconds into file test.wav
# arecord -f cd -d 10 test.wav
Play the recorded file
# aplay test.wav
Example:
# amixer set Headphone 35 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: 35 [56%] [-22.00dB] Playback [on] Front Right: 35 [56%] [-22.00dB] Playback [on] # amixer set 'Left Capture Inverting Mux' IN2L Simple mixer control 'Left Capture Inverting Mux',0 Capabilities: enum Items: 'IN1L' 'IN2L' 'IN3L' Item0: 'IN2L' # amixer set 'Right Capture Inverting Mux' IN2R Simple mixer control 'Right Capture Inverting Mux',0 Capabilities: enum Items: 'IN1R' 'IN2R' 'IN3R' Item0: 'IN2R' # amixer set 'Capture Input' ADC Simple mixer control 'Capture Input',0 Capabilities: enum Items: 'ADC' 'DMIC' Item0: 'ADC' # amixer set 'DMIC Mux' DMIC2 Simple mixer control 'DMIC Mux',0 Capabilities: enum Items: 'DMIC1' 'DMIC2' Item0: 'DMIC2' # 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
Audio Record and Play, DMIC
Set Headphones volume, range :0-63
# amixer set Headphone 35
Set capture input source to DMIC
# amixer set 'Capture Input' DMIC
Set DMIC Mux to DMIC1
# amixer set 'DMIC Mux' DMIC1
Record CD quality audio for 10 seconds into file test.wav
# arecord -f cd -d 10 test.wav
Play the recorded file
# aplay test.wav
Example:
# amixer set Headphone 35 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: 35 [56%] [-22.00dB] Playback [on] Front Right: 35 [56%] [-22.00dB] Playback [on] # amixer set 'Capture Input' DMIC Simple mixer control 'Capture Input',0 Capabilities: enum Items: 'ADC' 'DMIC' Item0: 'DMIC' # amixer set 'DMIC Mux' DMIC1 Simple mixer control 'DMIC Mux',0 Capabilities: enum Items: 'DMIC1' 'DMIC2' Item0: 'DMIC1' # 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
amixer without a parameter will show all available controls. For example:
# 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: 35 [56%] [-22.00dB] Playback [on] Front Right: 35 [56%] [-22.00dB] Playback [on] Simple mixer control 'Headphone ZC',0 Capabilities: pswitch Playback channels: Front Left - Front Right Mono: Front Left: Playback [on] Front Right: Playback [on] Simple mixer control 'Line Output',0 Capabilities: volume pswitch Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: 0 - 63 Front Left: 57 [90%] [0.00dB] Playback [on] Front Right: 57 [90%] [0.00dB] Playback [on] Simple mixer control 'Line Output ZC',0 Capabilities: pswitch Playback channels: Front Left - Front Right Mono: Front Left: Playback [on] Front Right: Playback [on] Simple mixer control 'Capture',0 Capabilities: cvolume cswitch Capture channels: Front Left - Front Right Limits: Capture 0 - 31 Front Left: Capture 24 [77%] [on] Front Right: Capture 24 [77%] [on] Simple mixer control 'Capture Input',0 Capabilities: enum Items: 'ADC' 'DMIC' Item0: 'DMIC' ...
Options:
amixer sset sID P set contents for one mixer simple control amixer sget sID get contents for one mixer simple control
For example:
# amixer sget 'Capture' Simple mixer control 'Capture',0 Capabilities: cvolume cswitch Capture channels: Front Left - Front Right Limits: Capture 0 - 31 Front Left: Capture 24 [77%] [on] Front Right: Capture 24 [77%] [on] # 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]
Capture currently now set to 81%.
Save/restore system's audio settings
alsactl store stores all alsamixer settings into a file.
Options:
store <card> save current driver setup for one or each soundcards
to configuration file
restore <card> load current driver setup for one or each soundcards
from configuration file
Example:
# alsactl store -f 123.conf # alsactl restore -f 123.conf