Audio Output

Hi, I just received my quad version and let me tell you it is very fast and I feel familiar with the linux environment.

My question is related to, Analog Audio Output (the green jack) is not working, if I connect the Udoo through HDMI audio play wells on the TV but Audio Output (headphones, Aux to stereo, etc) never works. How do I switch from HDMI output to Analog(jack) audio output.

In Raspberry pi I used to do as it:

Code:

amixer cset numid=3 1

I will really appreciate you help.

Best Regards.

 

How do you change it?

 

Unlike with the Pi, where a single audio device is toggled between analog and digital(HDMI), on Udoo the various sound outputs are independent channels, as on a PC with multiple sound-cards installed. So you could have separate audio playing back simultaneously on analog, HDMI, and SP-DIF, but do have to point your audio player software at the correct one.

Try 'aplay -l' to list the available PCM outputs, and look for "vt1613" which is the analog-out. Mine looks like this,

Code:

**** List of PLAYBACK Hardware Devices ****
card 0: imxspdif [imx-spdif], device 0: IMX SPDIF mxc-spdif-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: imxhdmisoc [imx-hdmi-soc], device 0: IMX HDMI TX mxc-hdmi-soc-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 2: vt1613audio [vt1613-audio], device 0: HiFi vt1613-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0

But I've patched the kernel to add SP-DIF and make it the first/default one (channel 0), so yours will be different. Say your vt1613 comes up second (channel 1, after 0)... you could specify, for example:

Code:

mplayer -ao alsa:device=hw=1.0  videofile.avi

mpg123 -a hw:1,0 -r 48000  audiofile.mp3

Specifying sample rate is necessary for mpg123 because the vt1613 analog-output supports only 48kHz, not 44.1kHz or other rates (I think the Pi is the same way)-- most player apps are smart enough to notice this and do the necessary resampling, but mpg123 will instead play 44.1k files back with incorrect tempo and pitch, sort of a mild chipmunk effect.

Mixer outputs might have to be turned up first, using alsamixer or amixer (e.g. 'amixer -qc1 sset Master 74%; amixer -qc1 sset PCM 74%' assuming it's device #1).

If you want this output (#1) to be the default in all ALSA apps without having to always specify it, try dropping this into /etc/asound.conf --

Code:

pcm.!default {
    type plug
    slave.pcm "hw:1,0"
}

I'm not sure about Pulseaudio or other audio drivers you might be using besides plain ALSA. Those would have their own config files to edit.

Hmm, I thought I remembered the vt1613 being audio device #0 (first one), at least on a stock Udoo Debian kernel, but if this were the case your sound should be going there by default. Maybe Udoobuntu switches them around? Anyway, 'aplay -l' should tell

 

Thank,
It says

**** List of PLAYBACK Hardware Devices ****
xcb_connection_has_error() returned true
card 0: vt1613audio [vt1613-audio], device 0: HiFi vt1613-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: imxhdmisoc [imx-hdmi-soc], device 0: IMX HDMI TX mxc-hdmi-soc-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0

I was able to play music by setting it to 0 but it is still weird how it isn't default
I found changing /usr/share/alsa/pulse-alsa.conf worked thanks