VAR-SOM-MX6 Audio record play: Difference between revisions

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{{PageHeader|VAR-SOM-MX6 - Audio Record/Play}} {{DocImage|category1=VAR-SOM-MX6|category2=Yocto}} __toc__
{{PageHeader|VAR-SOM-MX6 - Audio Record/Play}} {{DocImage|category1=VAR-SOM-MX6|category2=Yocto}} __toc__
<pre>$ amixer set PCM 125
= Get information on the Sound Cards =
Installed devices:
<pre>
root@var-som-mx6:~# cat /proc/asound/cards
0 [tlv320aic3xaudi]: tlv320aic3x-aud - tlv320aic3x-audio
                      tlv320aic3x-audio
1 [imxhdmisoc    ]: imx-hdmi-soc - imx-hdmi-soc
                      imx-hdmi-soc
</pre>
{{note|Note: imx-hdmi-soc will be listed only if an HDMI cable is connected.|info}}
List device names for playback:
<pre>
root@var-som-mx6:~# aplay -L
 
null
    Discard all samples (playback) or generate zero samples (capture)
sysdefault:CARD=tlv320aic3xaudi
    tlv320aic3x-audio,
    Default Audio Device
sysdefault:CARD=imxhdmisoc
    imx-hdmi-soc,
    Default Audio Device
surround40:CARD=imxhdmisoc,DEV=0
    imx-hdmi-soc,
    4.0 Surround output to Front and Rear speakers
surround41:CARD=imxhdmisoc,DEV=0
    imx-hdmi-soc,
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=imxhdmisoc,DEV=0
    imx-hdmi-soc,
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=imxhdmisoc,DEV=0
    imx-hdmi-soc,
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=imxhdmisoc,DEV=0
    imx-hdmi-soc,
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
</pre>
 
= Audio Playback =
Set PCM volume (main volume of audio codec), range :0-127
<pre>$ amixer set PCM 127</pre>
Play audio:
<pre>
$ aplay /usr/share/sounds/alsa/Front_Center.wav
$ aplay /usr/share/sounds/alsa/Front_Center.wav
</pre>
Example:
<pre>
root@var-som-mx6:~# amixer set PCM 125
Simple mixer control 'PCM',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 127
  Mono:
  Front Left: Playback 125 [98%] [-1.00dB]
  Front Right: Playback 125 [98%] [-1.00dB]
root@var-som-mx6:~# 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
</pre>
= Audio Record and Play, Line-in Jack=
<pre>
$ arecord -f cd -d 10 -D hw:0,0 test.wav
$ arecord -f cd -d 10 -D hw:0,0 test.wav
$ aplay test.wav  
$ aplay test.wav  
</pre>
Example:
<pre>
root@var-som-mx6:~# arecord -f cd -d 10 -D hw:0,0 test.wav
Recording WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
root@var-som-mx6:~# ^C
root@var-som-mx6:~# aplay test.wav
Playing WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
</pre>
= Advanced Controls =
amixer without a parameter will show all available controls.
For example:
<pre>
root@var-som-mx6:~# amixer
Simple mixer control 'PCM',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 127
  Mono:
  Front Left: Playback 125 [98%] [-1.00dB]
  Front Right: Playback 125 [98%] [-1.00dB]
Simple mixer control 'Line',0
  Capabilities: pswitch
  Playback channels: Front Left - Front Right
  Mono:
  Front Left: Playback [on]
  Front Right: Playback [on]
...
Simple mixer control 'Right PGA Mixer Mic3R',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [off]
</pre>
Options:
<pre>
amixer  sset sID P      set contents for one mixer simple control
amixer  sget sID        get contents for one mixer simple control
</pre>
For example:
<pre>
$ amixer  sget 'HP DAC'
Simple mixer control 'HP DAC',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 118
  Mono:
  Front Left: Playback 71 [60%] [-23.50dB]
  Front Right: Playback 71 [60%] [-23.50dB]
</pre>
HP DAC is a headphones DAC gain currently set to 60%.
The optional values are 0-118 equal to 0%-100%.
<pre>
$ amixer  sset 'HP DAC' 117 117
Simple mixer control 'HP DAC',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 118
  Mono:
  Front Left: Playback 117 [99%] [-0.50dB]
  Front Right: Playback 117 [99%] [-0.50dB]
</pre>
Headphones DAC gain currently now set to 99%.
= Save / restore system's audio settings =
alsactl store stores all alsamixer settings into a file<br>
alsctl
Options:
<pre>
  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
</pre>
Example:
<pre>
$ alsactl store -f 123.conf
$ alsactl restore -f 123.conf
</pre>
</pre>

Latest revision as of 11:28, 22 August 2017

VAR-SOM-MX6 - Audio Record/Play

Get information on the Sound Cards

Installed devices: 

root@var-som-mx6:~# cat /proc/asound/cards
 0 [tlv320aic3xaudi]: tlv320aic3x-aud - tlv320aic3x-audio
                      tlv320aic3x-audio
 1 [imxhdmisoc     ]: imx-hdmi-soc - imx-hdmi-soc
                      imx-hdmi-soc
Note: imx-hdmi-soc will be listed only if an HDMI cable is connected.

List device names for playback: 

root@var-som-mx6:~# aplay -L

null
    Discard all samples (playback) or generate zero samples (capture)
sysdefault:CARD=tlv320aic3xaudi
    tlv320aic3x-audio, 
    Default Audio Device
sysdefault:CARD=imxhdmisoc
    imx-hdmi-soc, 
    Default Audio Device
surround40:CARD=imxhdmisoc,DEV=0
    imx-hdmi-soc, 
    4.0 Surround output to Front and Rear speakers
surround41:CARD=imxhdmisoc,DEV=0
    imx-hdmi-soc, 
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=imxhdmisoc,DEV=0
    imx-hdmi-soc, 
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=imxhdmisoc,DEV=0
    imx-hdmi-soc, 
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=imxhdmisoc,DEV=0
    imx-hdmi-soc, 
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers

Audio Playback

Set PCM volume (main volume of audio codec), range :0-127 

$ amixer set PCM 127

Play audio: 

$ aplay /usr/share/sounds/alsa/Front_Center.wav

Example: 

root@var-som-mx6:~# amixer set PCM 125
Simple mixer control 'PCM',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 127
  Mono:
  Front Left: Playback 125 [98%] [-1.00dB]
  Front Right: Playback 125 [98%] [-1.00dB]
root@var-som-mx6:~# 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

$ arecord -f cd -d 10 -D hw:0,0 test.wav
$ aplay test.wav

Example: 

root@var-som-mx6:~# arecord -f cd -d 10 -D hw:0,0 test.wav
Recording WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
root@var-som-mx6:~# ^C
root@var-som-mx6:~# 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: 

root@var-som-mx6:~# amixer
Simple mixer control 'PCM',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 127
  Mono:
  Front Left: Playback 125 [98%] [-1.00dB]
  Front Right: Playback 125 [98%] [-1.00dB]
Simple mixer control 'Line',0
  Capabilities: pswitch
  Playback channels: Front Left - Front Right
  Mono:
  Front Left: Playback [on]
  Front Right: Playback [on]

...

Simple mixer control 'Right PGA Mixer Mic3R',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [off]

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 'HP DAC'
Simple mixer control 'HP DAC',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 118
  Mono:
  Front Left: Playback 71 [60%] [-23.50dB]
  Front Right: Playback 71 [60%] [-23.50dB]

HP DAC is a headphones DAC gain currently set to 60%. The optional values are 0-118 equal to 0%-100%. 

$ amixer   sset 'HP DAC' 117 117
Simple mixer control 'HP DAC',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 118
  Mono:
  Front Left: Playback 117 [99%] [-0.50dB]
  Front Right: Playback 117 [99%] [-0.50dB]

Headphones DAC gain currently now set to 99%.

Save / restore system's audio settings

alsactl store stores all alsamixer settings into a file
alsctl 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
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This page was last edited on 22 August 2017, at 11:28.

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