I am attempting to split a 7.1 usb soundcard into 4 stereo outputs on a ras pberry pi, running raspbian, when I use lib_ao_default, its streams out of the front channels seamlessly, when I use lib_options and specify the virtu al soundcard I made, streaming is very choppy!
The same thing happens using aplay, just specifying the wav file it plays s moothly, when I tell it to use 1 of the devs I specify it plays and a norma l rate, but 4-5 times a second the audio stops playing, and continues as if it has played it.
here is my asound.conf
#/etc/asound.conf pcm_slave.eightchannels { pcm "hw:0,0" # or "hw:1,0" for the second card channels 8 } pcm.stereo1 { type plug slave.pcm { type dshare ipc_key 87882222 slave eightchannels bindings [ 2 3 ] } } pcm.stereo2 { type plug slave.pcm { type dshare ipc_key 87882222 slave eightchannels bindings [ 4 5 ] } } pcm.stereo3 { type plug slave.pcm { type dshare ipc_key 87882222 slave eightchannels bindings [ 6 7 ] } } pcm.stereo4 { type plug slave.pcm { type dshare ipc_key 87882222 slave eightchannels bindings [ 0 1 ] } }
lsusb -v -t /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc_otg/1p, 480M |__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/3p, 480M |__ Port 1: Dev 3, If 0, Class=vend., Driver=smsc95xx, 480M |__ Port 3: Dev 5, If 0, Class=audio, Driver=snd-usb-audio, 12M |__ Port 3: Dev 5, If 1, Class=audio, Driver=snd-usb-audio, 12M |__ Port 3: Dev 5, If 2, Class=audio, Driver=snd-usb-audio, 12M |__ Port 3: Dev 5, If 3, Class=HID, Driver=usbhid, 12M
aplay -l
**** List of PLAYBACK Hardware Devices **** card 0: Device [USB Sound Device], device 0: USB Audio [USB Audio] Subdevices: 0/1 Subdevice #0: subdevice #0 card 1: ALSA [bcm2835 ALSA], device 0: bcm2835 ALSA [bcm2835 ALSA] Subdevices: 8/8 Subdevice #0: subdevice #0 Subdevice #1: subdevice #1 Subdevice #2: subdevice #2 Subdevice #3: subdevice #3 Subdevice #4: subdevice #4 Subdevice #5: subdevice #5 Subdevice #6: subdevice #6 Subdevice #7: subdevice #7
aplay -L null Discard all samples (playback) or generate zero samples (capture) default:CARD=Device USB Sound Device, USB Audio Default Audio Device sysdefault:CARD=Device USB Sound Device, USB Audio Default Audio Device front:CARD=Device,DEV=0 USB Sound Device, USB Audio Front speakers surround40:CARD=Device,DEV=0 USB Sound Device, USB Audio
4.0 Surround output to Front and Rear speakers surround41:CARD=Device,DEV=0 USB Sound Device, USB Audio
4.1 Surround output to Front, Rear and Subwoofer speakers surround50:CARD=Device,DEV=0 USB Sound Device, USB Audio
5.0 Surround output to Front, Center and Rear speakers surround51:CARD=Device,DEV=0 USB Sound Device, USB Audio
5.1 Surround output to Front, Center, Rear and Subwoofer speakers surround71:CARD=Device,DEV=0 USB Sound Device, USB Audio
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers iec958:CARD=Device,DEV=0 USB Sound Device, USB Audio IEC958 (S/PDIF) Digital Audio Output default:CARD=ALSA bcm2835 ALSA, bcm2835 ALSA Default Audio Device sysdefault:CARD=ALSA bcm2835 ALSA, bcm2835 ALSA Default Audio Device
James