[mythtv-users] Raspberry Pi - Audio Passthrough
rob e
redgerhoo at yahoo.com.au
Mon May 9 22:17:28 UTC 2016
ok, it's working ... both AC3 and DTS pass through beautifully and no
impact to video
my receiver reports 5.1 sound and video is no longer impacted in any way
based on these
https://github.com/raspberrypi/linux/issues/997
https://gist.githubusercontent.com/julianscheel/9094131/raw/af99299b11d32693abb07481698b1f963a423076/bcm2835.conf
add a new file
/usr/share/alsa/cards/bcm2835.conf
with the content above (second link)
reboot
then select the new IEC958 option in Audio setup, no mixer ... and Bob's
your uncle
aplay -L # Note the new iec958 option at the end of the list
null
Discard all samples (playback) or generate zero samples (capture)
sysdefault:CARD=ALSA
bcm2835 ALSA, bcm2835 ALSA
Default Audio Device
dmix:CARD=ALSA,DEV=0
bcm2835 ALSA, bcm2835 ALSA
Direct sample mixing device
dmix:CARD=ALSA,DEV=1
bcm2835 ALSA, bcm2835 IEC958/HDMI
Direct sample mixing device
dsnoop:CARD=ALSA,DEV=0
bcm2835 ALSA, bcm2835 ALSA
Direct sample snooping device
dsnoop:CARD=ALSA,DEV=1
bcm2835 ALSA, bcm2835 IEC958/HDMI
Direct sample snooping device
hw:CARD=ALSA,DEV=0
bcm2835 ALSA, bcm2835 ALSA
Direct hardware device without any conversions
hw:CARD=ALSA,DEV=1
bcm2835 ALSA, bcm2835 IEC958/HDMI
Direct hardware device without any conversions
plughw:CARD=ALSA,DEV=0
bcm2835 ALSA, bcm2835 ALSA
Hardware device with all software conversions
plughw:CARD=ALSA,DEV=1
bcm2835 ALSA, bcm2835 IEC958/HDMI
Hardware device with all software conversions
iec958:CARD=ALSA,DEV=0
bcm2835 ALSA, bcm2835 IEC958/HDMI
IEC958 (S/PDIF) Digital Audio Output
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