Transclusion: Debian: CL-SOM-iMX7: Analog Audio - Revision history

imported>Uri.mashiach at 14:42, 4 December 2018

2018-12-04T14:42:22Z

Urim at 09:23, 27 March 2018

2018-03-27T09:23:50Z

Ilya at 11:24, 14 June 2017

2017-06-14T11:24:22Z

Ilya: /* WiFi */

2017-04-23T08:20:34Z

‎WiFi

Ilya: /* USB On-The-Go (OTG) */

2017-02-15T10:58:31Z

‎USB On-The-Go (OTG)

New page

CL-SOM-iMX7 provides an analog audio interface, which is registered as a standard ALSA sound card.
Use {{cmd|aplay -l}} to list all soundcards and digital audio devices registered on the system:
<pre>
root@cl-som-imx7-sid:~# 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
</pre>

==== Analog Audio Settings ====
To enable the Analog audio playback, {{cmd|alsamixer}} or {{cmd|amixer}} applications can be used.
* {{cmd|alsamixer}} - set the “''Output Mixer HiFi''” control on.
or
* {{cmd|amixer}} - set the “''Output Mixer HiFi Playback Switch''” control on using command line interface:
<pre>
root@cl-som-imx7-sid:~# amixer cset numid=14 1
numid=14,iface=MIXER,name='Output Mixer HiFi Playback Switch'
; type=BOOLEAN,access=rw------,values=1
: values=on
</pre>

==== Analog Audio Playback ====
In order to play back a sound file make use of the {{cmd|aplay}} application.
<dl>
* {{cmd|aplay -L}} can be used for listing of all pcm devices.
</dl>
Here is a sample output of {{cmd|aplay -L}} command:
<pre>
root@cl-som-imx7-sid:~# 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
</pre>

The next command can be used for audio play back:
<pre>
root@cl-som-imx7-sid:~# aplay <wav-file>
</pre>

==== Audio Input Settings ====
CL-SOM-iMX7 provides an audio capturing feature from either ''Mic'' or ''Line In'' input sources.
{{cmd|alsamixer}} or {{cmd|amixer}} can be used in order to switch between these inputs.
===== Mic =====
* {{cmd|alsamixer}}
:: Capture Volume => 100
:: Line Capture Switch => off
:: Mic Capture Switch => on
:: Input Mux => Mic
* {{cmd|amixer}}
<pre>
amixer cset numid=3 31
amixer cset numid=4 0
amixer cset numid=6 1
amixer cset numid=11 1
</pre>
===== Line In =====
* {{cmd|alsamixer}}
:: Capture Volume => 100
:: Line Capture Switch => on
:: Mic Capture Switch => off
:: Input Mux => Line In
* {{cmd|amixer}}
<pre>
amixer cset numid=3 31
amixer cset numid=4 1
amixer cset numid=6 0
amixer cset numid=11 0
</pre>

==== 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 {{cmd|arecord}} usage for capturing audio signal from the selected input line.
<pre>
root@cl-som-imx7-sid:~# arecord -f dat -t wav /tmp/out.wav
</pre>

@@ Line 1: / Line 1: @@
-<!--CL-SOM-iMX7 provides an analog audio interface, which is registered as a standard ALSA sound card.
+Use {{cmd|aplay -l}} to list all sound cards and digital audio devices registered on the system:
 <pre>
 root@cl-rootfs:~# aplay -l
@@ Line 7: / Line 6: @@
    Subdevices: 1/1
    Subdevice #0: subdevice #0
-</pre>-->
+</pre>
 ==== Analog Audio Playback ====
@@ Line 41: / Line 40: @@
 The next command can be used for audio play back:
 <pre>
-root@cl-rootfs:~# aplay <wav-file>
+root@cl-rootfs:~# aplay -D sysdefault <wav-file>
 </pre>
@@ Line 55: / Line 54: @@
 * {{cmd|amixer}}
 <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=11 1
+amixer -c 0 cset numid=6 1
 </pre>
 ===== Line In =====
@@ Line 68: / Line 68: @@
 * {{cmd|amixer}}
 <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=11 0
+amixer -c 0 cset numid=6 0
 </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.
 <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>

@@ Line 2: / Line 2: @@
 Use {{cmd|aplay -l}} to list all soundcards and digital audio devices registered on the system:
 <pre>
-root@cl-som-imx7-sid:~# aplay -l
+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 []
@@ Line 15: / Line 15: @@
 * {{cmd|amixer}} - set the “''Output Mixer HiFi Playback Switch''” control on using command line interface:
 <pre>
-root@cl-som-imx7-sid:~# amixer cset numid=14 1
+root@cl-rootfs:~# amixer cset numid=14 1
 numid=14,iface=MIXER,name='Output Mixer HiFi Playback Switch'
    ; type=BOOLEAN,access=rw------,values=1
@@ Line 28: / Line 28: @@
 Here is a sample output of {{cmd|aplay -L}} command:
 <pre>
-root@cl-som-imx7-sid:~# aplay -L
+root@cl-rootfs:~# aplay -L
 null
      Discard all samples (playback) or generate zero samples (capture)
@@ Line 53: / Line 53: @@
 The next command can be used for audio play back:
 <pre>
-root@cl-som-imx7-sid:~# aplay <wav-file>
+root@cl-rootfs:~# aplay <wav-file>
 </pre>
@@ Line 90: / Line 90: @@
 Here is a sample command that shows the {{cmd|arecord}} usage for capturing audio signal from the selected input line.
 <pre>
-root@cl-som-imx7-sid:~# arecord -f dat -t wav /tmp/out.wav
+root@cl-rootfs:~# arecord -f dat -t wav /tmp/out.wav
 </pre>