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--- products:sbc:vim3:applications:earc [2023/11/08 20:59]
nick created
+++ products:sbc:vim3:applications:earc [2023/11/08 23:08] (current)
sravan
@@ Line 1: / Line 1: @@
-e
+====== VIM3L eARC ======
+===== Introduction =====
+eARC is a feature implemented in the latest HDMI 2.1 specification, This allows you to transmit high-quality audio from your TV to your Soundbar or AV receiver and is compatible with the high bitrate formats Dolby Atmos and DTS.
+This documentation will guide you how to record audio from the HDMI eARC channel.
+<WRAP important >
+Only for VIM3L with 5.15 kernel.
+</WRAP>
+===== TV side setup =====
+In order to use the eARC function, you need to make sure your TV is also eARC capable, It is denoted by the eARC label on the HDMI Input.
+You can also check with the TV vendor about how to enable it.
+===== VIM3L side setup =====
+You also need to enable the eARC Receiver function on VIM3L, you can follow the command below to enable eARC RX.
+```shell
+$ amixer cset name='ARC eARC RX enable' 1
+```
+Check its status if it's enabled:
+```shell
+$ amixer cget name='ARC eARC RX enable'
+numid=41,iface=MIXER,name='ARC eARC RX enable'
+  ; type=BOOLEAN,access=rw------,values=1
+  : values=on
+```
+''values=on'' means eARC RX is enabled.
+===== Hardware connection =====
+You need to use a HDMI 2.1 cable to connect VIM3L HDMI port to your TV HDMI Input with eARC function.
+===== Check eARC status =====
+You can follow the command below to check the status of eARC.
+```shell
+khadas@Khadas:~$ amixer cget name='eARC_RX attended type'
+numid=24,iface=MIXER,name='eARC_RX attended type'
+  ; type=ENUMERATED,access=rw------,values=1,items=3
+  ; Item #0 'DISCONNECT'
+  ; Item #1 'ARC'
+  ; Item #2 'eARC'
+  : values=2
+```
+^ Value ^ Status ^
+|''values=2''| Device work on eARC |
+|''values=1''| Device work on ARC |
+|''values=0''| ARC/eARC not connected |
+If your setup is correct, it should be ''values=2'' which means work on eARC.
+<WRAP tip >
+You can also try to unplug/replug HDMI cable to check.
+</WRAP>
+===== Record audio from eARC =====
+You can check the record sound devices with ''arecord -l''
+```shell
+$ arecord -l
+**** List of CAPTURE Hardware Devices ****
+card 0: AMLAUGESOUND [AML-AUGESOUND], device 0: TDM-B-dummy-alsaPORT-i2s multicodec-0 []
+  Subdevices: 1/1
+  Subdevice #0: subdevice #0
+card 0: AMLAUGESOUND [AML-AUGESOUND], device 1: TDM-A-dummy-alsaPORT-pcm multicodec-1 []
+  Subdevices: 1/1
+  Subdevice #0: subdevice #0
+card 0: AMLAUGESOUND [AML-AUGESOUND], device 2: TDM-C-dummy dummy-2 []
+  Subdevices: 1/1
+  Subdevice #0: subdevice #0
+card 0: AMLAUGESOUND [AML-AUGESOUND], device 3: PDM-dummy-alsaPORT-pdm dummy-3 []
+  Subdevices: 1/1
+  Subdevice #0: subdevice #0
+card 0: AMLAUGESOUND [AML-AUGESOUND], device 4: SPDIF-dummy-alsaPORT-spdif dummy-4 []
+  Subdevices: 1/1
+  Subdevice #0: subdevice #0
+card 0: AMLAUGESOUND [AML-AUGESOUND], device 6: EARC/ARC-dummy-alsaPORT-earc dummy-6 []
+  Subdevices: 1/1
+  Subdevice #0: subdevice #0
+card 0: AMLAUGESOUND [AML-AUGESOUND], device 7: LOOPBACK-A-dummy-alsaPORT-loopback dummy-7 []
+  Subdevices: 1/1
+  Subdevice #0: subdevice #0
+```
+The ''card 0, device 6'' device is the eARC device. You can record audio with the command below:
+```shell
+arecord -D hw:0,6 -f S16_LE -c 2 -r 48000 /tmp/out.wav
+```

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