Hi,
I have a problem that audio via Airplay is played mono (using left channel audio). If I play the same audio file using mpd, everything works fine (plays in stereo).
Some info:
- My hardware consists of a Raspberry Pi 2 with a DAC connected via I2S. I use ‘Hifiberry’ as I2S driver.
- I’ve installed Volumio1.55PI.img
- aplay listing:
root@volumio:~# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: sndrpihifiberry [snd_rpi_hifiberry_dac], device 0: HifiBerry DAC HiFi pcm5102a-hifi-0 []
Subdevices: 0/1
Subdevice #0: subdevice #0
root@volumio:~# aplay -L
null
Discard all samples (playback) or generate zero samples (capture)
default:CARD=sndrpihifiberry
snd_rpi_hifiberry_dac,
Default Audio Device
sysdefault:CARD=sndrpihifiberry
snd_rpi_hifiberry_dac,
Default Audio Device
front:CARD=sndrpihifiberry
snd_rpi_hifiberry_dac,
Default Audio Device
dmix:CARD=sndrpihifiberry,DEV=0
snd_rpi_hifiberry_dac,
Direct sample mixing device
dsnoop:CARD=sndrpihifiberry,DEV=0
snd_rpi_hifiberry_dac,
Direct sample snooping device
hw:CARD=sndrpihifiberry,DEV=0
snd_rpi_hifiberry_dac,
Direct hardware device without any conversions
plughw:CARD=sndrpihifiberry,DEV=0
snd_rpi_hifiberry_dac,
Hardware device with all software conversions
I’ve created two audio files for testing; audio_left.mp3 and audio_right.mp3. Playing directly from the command line gives the same problem:
- mplayer audio_left.mp3 --> audio on both speakers
- mplayer audio_right.mp3 --> no audio on speaker
I’ve been looking at this whole day but I’m … stuck 
Could anyone please give me a hint (or even better; the answer) on how to solve/analyse this problem?!
Thanx in advance!,
Umberto