I purchased an HDMI audio extractor: Amazon.com which was the cheapest box that would extract only audio from HDMI. I previously was using a USB dongle but found that hard shutdowns in Ubuntu corrupted the USB port requiring frequent reinstalls. I’m hoping that the HDMI audio output will be a bit more resilient in an embedded device. However, I can’t get any audio to play through the HDMI audio extractor. I’ve installed alsa-utils via apt-get. Could you help me troubleshoot the HDMI audio output?
When The HDMI audio converter powers up, it plays a frequency sweep, showing that it has power. However, no more sounds come out of it.
Here’s the output of aplay -L
null
Discard all samples (playback) or generate zero samples (capture)
sysdefault:CARD=Black
TI BeagleBone Black,
Default Audio Device
dmix:CARD=Black,DEV=0
TI BeagleBone Black,
Direct sample mixing device
dsnoop:CARD=Black,DEV=0
TI BeagleBone Black,
Direct sample snooping device
hw:CARD=Black,DEV=0
TI BeagleBone Black,
Direct hardware device without any conversions
plughw:CARD=Black,DEV=0
TI BeagleBone Black,
Hardware device with all software conversions
aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Black [TI BeagleBone Black], device 0: HDMI nxp-hdmi-hifi-0
Subdevices: 1/1
Subdevice #0: subdevice #0
I tried to add a ~/.asoundrc
pcm.!default {
type hw
card 0
}
ctl.!default {
type hw
card 0
}
Then, it required only signed 32-bit little endian files:
aplay -vv music/samples/quadra.wav
Playing WAVE ‘music/samples/quadra.wav’ : Signed 16 bit Little Endian, Rate 44100 Hz, Mono
aplay: set_params:1081: Sample format non available
Available formats:
- S32_LE
So I made a stereo 32-bit version of the file and even tried sudo:
sudo aplay quadra_s32_le_stereo.wav
Playing WAVE ‘quadra_s32_le_stereo.wav’ : Signed 32 bit Little Endian, Rate 44100 Hz, Stereo
Warning: rate is not accurate (requested = 44100Hz, got = 48000Hz)
please, try the plug plugin (-Dplug:default)
sudo aplay -Dplug:default quadra_s32_le_stereo.wav
Playing WAVE ‘quadra_s32_le_stereo.wav’ : Signed 32 bit Little Endian, Rate 44100 Hz, Stereo
Does anyone have any suggestions?
Thanks much.