Hi Greg,
Greg Erskine wrote:
>
> The piCore implementation of ALSA may be missing a few things. ALSA did
> change a few version back, you could try pCP2.03 or so.
>
I found that ALSA really changed! All "old" config hints I found were
useless! Seems that pCP comes with a newer ALSA version than most other
distributions. But...
I FINALLY DID IT! :cool:
So here is my working asound.conf for the recent (3.02) version of
piCorePlayer:
Code:
--------------------
pcm.logilink { # alias for our sound card
type hw # must be hw in our case
card 1 # check your correct card number by typing
device 0 # 'aplay -l' in your terminal
} # the 1st usb card on the Raspi shows as
# card 1: Device [USB Sound Device],
device 0: USB Audio [USB Audio]
ctl.logilink {
type hw
card 1
device 0
}
pcm.dmixer {
type dmix
ipc_key 1024
ipc_perm 0666 # neccesary for normal user to have
access to outputs
slave.pcm "logilink"
slave {
period_time 0
period_size 1024
buffer_size 4096
rate 44100
channels 8
}
bindings {
0 0
1 1
2 2
3 3
4 4
5 5
6 6
7 7
}
}
pcm.!default {
type plug
slave.pcm "dmixer"
}
pcm.stereofront { # the name of our splitted output
type plug
slave {
pcm "dmixer"
channels 8
}
ttable.0.0 1
ttable.1.1 1
}
pcm.stereocenter {
type plug
slave {
pcm "dmixer"
channels 8
}
ttable.0.2 1
ttable.1.3 1
}
pcm.stereoback {
type plug
slave {
pcm "dmixer"
channels 8
}
ttable.0.4 1
ttable.1.5 1
}
pcm.stereosurround {
type plug
slave {
pcm "dmixer"
channels 8
}
ttable.0.6 1
ttable.1.7 1
}
pcm.stereoall {
type plug
slave {
pcm "dmixer"
channels 8
}
ttable.0.0 1
ttable.1.1 1
ttable.0.2 1
ttable.1.3 1
ttable.0.4 1
ttable.1.5 1
ttable.0.6 1
ttable.1.7 1
}
--------------------
The available outputs are
-stereofront
stereosurround
stereocenter
stereoback
stereoall-
This additional outputs are NOT(!) shown by typing
Code:
--------------------
/mnt/mmcblk0p2/tce/squeezelite-armv6hf -l
--------------------
in your terminal. This make it hard to find config errors.
But you can see some error output if your asound.conf is misconfigured
or has typo errors
like:
Code:
--------------------
ALSA lib conf.c:1698:(snd_config_load1) _toplevel_:53:1:Unexpected char
ALSA lib conf.c:3458:(config_file_open) /etc/asound.conf may be old or
corrupted: consider to remove or fix it
ALSA lib conf.c:3380:(snd_config_hooks_call) function snd_config_hook_load
returned error: Invalid argument
ALSA lib conf.c:3829:(snd_config_update_r) hooks failed, removing
configuration
--------------------
And yes, don't forget to
Code:
--------------------
sudo filetool.sh -b
--------------------
on every config file change to save it.
With 'stereoall' you can put sound to all 4 stereo outs together. You
even can split the card to mono channels so theoretically 8 single
mono-mixed outs would be possible (already tested). Perhaps more than a
normal raspi could handle.
Btw. with 4 instances streaming on my Raspberry 1B top shows a load
between 1.00 and about 1.5 as long as LMS runs on a different machine.
I hope this can help in some way for future development of piCorePlayer.
Perhaps showing the instances on their own pages in browser would be a
great feature.
My next goal is to set the right GPIO pins for (de-)activating the
corresponding amps for each output.
Special thanks to Greg for the right hints with ALSA changes... ;)
greetings
mff
------------------------------------------------------------------------
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