Linux Audio record play: Difference between revisions
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<!-- Set release according to "release" parameter in URL and use RELEASE_SUMO_V1.0_DART-MX8M as default | <!-- Set release according to "release" parameter in URL and use RELEASE_SUMO_V1.0_DART-MX8M as default | ||
--> {{ | --> {{INIT_RELEASE_PARAM|RELEASE_SUMO_V1.0_DART-MX8M}}<!-- | ||
--> {{#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 | <!-- | |||
--> {{#switch:{{#var:HARDWARE_NAME}} | <!-- | |||
--> DART-MX8M-PLUS = {{#ifexpr: {{#var:YOCTO_VERSION}} > 3.2 | yes | no }} | <!-- | |||
--> {{#ifexpr: {{#var:YOCTO_VERSION}} > 3.0 | yes | no }} <!-- | |||
--> }} <!-- | |||
--> }} <!-- | |||
# 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}} | |||
| am6={{#vardefine: ARECORD_EXTRA_ARGS | -r 48000 --period-size=64}} | |||
|#default= | |||
}}<!-- | |||
--> {{PageHeader|{{#var:HARDWARE_NAME}} Audio Record/Play}} {{DocImage|category1=Yocto|category2={{#var:HARDWARE_NAME}}}} __toc__ | --> {{PageHeader|{{#var:HARDWARE_NAME}} Audio Record/Play}} {{DocImage|category1=Yocto|category2={{#var:HARDWARE_NAME}}}} __toc__ | ||
= Get information on the Sound Cards = | = Get information on the Sound Cards = | ||
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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 | ||
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Example: | Example: | ||
<pre> | <pre> | ||
# amixer | # amixer set Headphone 35 | ||
Simple mixer control 'Headphone',0 | Simple mixer control 'Headphone',0 | ||
Capabilities: volume pswitch | Capabilities: volume pswitch | ||
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<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 | ||
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</pre> | </pre> | ||
Record CD quality audio for 10 seconds into file test.wav | Record CD quality audio for 10 seconds into file test.wav | ||
# arecord {{#var:ARECORD_EXTRA_ARGS}} -f cd -d 10 test.wav | |||
# arecord -f cd -d 10 test.wav | |||
Play the recorded file | Play the recorded file | ||
<pre> | <pre> | ||
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</pre> | </pre> | ||
Example: | Example: | ||
# amixer | # amixer set Headphone 35 | ||
Simple mixer control 'Headphone',0 | 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' ADC | # amixer set 'Left Capture Inverting Mux' IN2L | ||
Simple mixer control 'Capture Input',0 | Simple mixer control 'Left Capture Inverting Mux',0 | ||
Capabilities: enum | |||
Items: 'IN1L' 'IN2L' 'IN3L' | |||
Item0: 'IN2L' | |||
# amixer set 'DMIC Mux' DMIC2 | # amixer set 'Right Capture Inverting Mux' IN2R | ||
Simple mixer control 'DMIC Mux',0 | Simple mixer control 'Right Capture Inverting Mux',0 | ||
Capabilities: enum | |||
Items: 'IN1R' 'IN2R' 'IN3R' | |||
Item0: 'IN2R' | |||
# arecord -f cd -d 10 test.wav | # amixer set 'Capture Input' ADC | ||
Recording WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo | Simple mixer control 'Capture Input',0 | ||
# aplay test.wav | Capabilities: enum | ||
Playing WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo | Items: 'ADC' 'DMIC' | ||
Item0: 'ADC' | |||
# amixer set 'DMIC Mux' DMIC2 | |||
Simple mixer control 'DMIC Mux',0 | |||
Capabilities: enum | |||
Items: 'DMIC1' 'DMIC2' | |||
Item0: 'DMIC2' | |||
# arecord {{#var:ARECORD_EXTRA_ARGS}} -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 = | = Audio Record and Play, DMIC = | ||
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</pre> | </pre> | ||
Record CD quality audio for 10 seconds into file test.wav | Record CD quality audio for 10 seconds into file test.wav | ||
# arecord {{#var:ARECORD_EXTRA_ARGS}} -f cd -d 10 test.wav | |||
# arecord -f cd -d 10 test.wav | |||
Play the recorded file | Play the recorded file | ||
<pre> | <pre> | ||
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</pre> | </pre> | ||
Example: | Example: | ||
# amixer | # amixer set Headphone 35 | ||
Simple mixer control 'Headphone',0 | 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 | # amixer set 'Capture Input' DMIC | ||
Simple mixer control 'Capture Input',0 | Simple mixer control 'Capture Input',0 | ||
Capabilities: enum | |||
Items: 'ADC' 'DMIC' | |||
Item0: 'DMIC' | |||
# amixer set 'DMIC Mux' DMIC1 | # amixer set 'DMIC Mux' DMIC1 | ||
Simple mixer control 'DMIC Mux',0 | Simple mixer control 'DMIC Mux',0 | ||
Capabilities: enum | |||
Items: 'DMIC1' 'DMIC2' | |||
Item0: 'DMIC1' | |||
# arecord -f cd -d 10 test.wav | # arecord {{#var:ARECORD_EXTRA_ARGS}} -f cd -d 10 test.wav | ||
Recording WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo | Recording WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo | ||
# aplay test.wav | # aplay test.wav | ||
Playing WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo | Playing WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo | ||
= Advanced Controls = | = Advanced Controls = | ||
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</pre> | </pre> | ||
Capture currently now set to 81%. | Capture currently now set to 81%. | ||
{{#ifeq: {{#var:SUPPORT_WM8904_DRC}} | yes | | |||
== Enabling the Dynamic Rate Controller (DRC) == | |||
The codec WM8904 provide a Dynamic Rate Controller that can be used to amplify the DMIC input using an Automatic Gain Control (AGC) configuration. | |||
The details of how the DRC works are available in the application note [https://statics.cirrus.com/pubs/appNote/WAN0215.pdf WAN0215]. | |||
In latest kernels 5.4.x, dedicated patches have been introduced to provide the available parameters shown in the applications section of WAN0215. | |||
To enable DRC, run: | |||
amixer set 'DRC' on | |||
To select the DRM mode, run: | |||
amixer set 'DRC Mode' 'tradition' | |||
The available 'DRC modes' are: | |||
* "default": the default settings upon reset | |||
* "peaklimiter": the signal level is unchanged for amplitudes below the knee, but sharply reduced for amplitudes above the knee. Normally the knee will be at a high amplitude e.g. around -6dB, so that the majority of the dynamic range is unchanged | |||
* "tradition": typical traditional ALC characteristic | |||
* "soft": used in applications where a gentler ALC characteristic is required, for example where both speech and music recording is required without reconfiguring compressor parameters | |||
* "music": uses even gentler compression characteristics and uses a higher knee threshold to limit the gain to around 20dB | |||
Additional modes may be added, providing the relevant registers configurations in arch/arm64/boot/dts/freescale/{{#var:DEFAULT_DTB}} under kernel source tree: | |||
<pre> | |||
wm8904: codec@1a { | |||
... | |||
num-drc-cfgs = <5>; /* must match the number of items in the following 2 lists */ | |||
drc-cfg-names = "default", "peaklimiter", "tradition", "soft", "music"; | |||
drc-cfg-regs = | |||
/* coded default: KNEE_IP = KNEE_OP = 0, HI_COMP = LO_COMP = 1 */ | |||
<0x01af 0x3248 0x0000 0x0000>, | |||
/* coded default: KNEE_IP = -24, KNEE_OP = -6, HI_COMP = 1/4, LO_COMP = 1 */ | |||
<0x04af 0x324b 0x0010 0x0408>, | |||
/* coded default: KNEE_IP = -42, KNEE_OP = -3, HI_COMP = 0, LO_COMP = 1 */ | |||
<0x04af 0x324b 0x0028 0x0704>, | |||
/* coded default: KNEE_IP = -45, KNEE_OP = -9, HI_COMP = 1/8, LO_COMP = 1 */ | |||
<0x04af 0x324b 0x0018 0x078c>, | |||
/* coded default: KNEE_IP = -30, KNEE_OP = -10.5, HI_COMP = 1/4, LO_COMP = 1 */ | |||
<0x04af 0x324b 0x0010 0x050e>; | |||
... | |||
}; | |||
</pre> | |||
| }} | |||
= 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:
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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