I’m still pretty new to my BBB / BBGW (I prefer the BBGW simply because of it’s inbuilt wifi - real simple).
So, I’m running on a SEED BeagleBone Green Wireless.
with Debian / Linux 8 : 2016-06-14. The system is up to date - as of now.
I’m running headless via wi-fi ssh on Terminal (Mac Sierra).
and I’m trying to add sound playback of mp3 / wav files.
I’ve installed / updated alsa and alsa-utils.
I’ve plugged in a standard 10$ USB sound stick form EC Technology - some post suggest I get this one - I’m ambivalent as to the precise device but the smaller the better : https://www.amazon.co.uk/EC-Technology-Adapter-Window-above/dp/B012W70XH8/ref=sr_1_1?ie=UTF8&qid=1486650199&sr=8-1&keywords=EC-Technology+usb+sound+Adapter
I’m also happy to switch to a new device if there is an even smaller / better / more readily hackable device available - but that’s probably for another time - suggestions always welcome though !)
I’ve used ‘aplay -l’ to confirm the USB device exists :
card0:WILINK8_BT… device 0: WILIINK8 …
Subdevice #0: subdevice #0
card1: Device [USB Audio Device], device 0: USB Audio [USB Audio]
Subdevice #0: subdevice #0
I have reconfigured the alsa device file (/usr/share/alsa/alsa.conf) to direct audio to the USB card (defaults.ctl.card 1 and defaults.pcm.card 1) and not the BT module and I can hear pink noise (sound-test) from the connected USB Audio stick & speakers / headphones following an alsa restart / system reboot.
I have installed mpg321 and, more recently, madplay.
I have dumped some ripped mp3 music files into a ‘Music’ directory on uSDCard and can hear the output with :
mpg321 -g 50 /media/uSDCard/Music/MyMusicTrack.mp3
The sound that I hear appears to be ‘clipped’. It is distorted and plays back too fast but with no increase in pitch etc. just like a broken / poor 'phone connection.
Initially, I thought the problem may be with the track/file I had copied across & chosen to play, so selected another (no difference). Then I selected and left playing the whole folder (around 12 tracks) whilst I did some research.
mpg321 -g 50 /media/uSDCard/Music/*
Oddly enough, after a couple of tracks the sound was perfect and I listened to the rest of the selection (maybe 8 or 9 tracks in total) with some satisfaction. I also concluded (incorrectly) that the problem must have been with some of the files having been corrupted during the transfer process. However, when I decided to play the tracks again I note they are ALL suffering from the same clipped / broken / slightly too fast playback problem.
I’m delighted to have gotten this far but… frustration… so near and yet so far…
I have tried with powered speakers and with a simple headset… (no difference, remains distorted / clipped).
I have tried with mpg321 and madplay… (no difference, remains distorted / clipped).
Anyways, I’m now pretty sure this is a sampling mismatch / there will be some setting I’ve missed but, like my opening line said, I’m still pretty new to the BBB / BBGW and I’m unsure as to how to proceed - especially as I’m pretty nervous of taking too many retro-steps and ‘playing’ with far too little knowledge. I have googled and forum-ed this but find it confusing enough extracting relevant Wheezy / Jessie differences and trying to adapt Raspbian / Debian examples etc… anyways… I’m lost…
Apologies for the length of this post but too much info is generally better than way too little… I hope…
Thanks for reading, hope you can give me some pointers.