[alsa-devel] Request for help CM109 on arm board
Hi all,
I've written an application on the PC that works with alsa, it uses 8 mono 22050Hz 16 bit audio channels via alsa.
I'm trying to port the application to an Arm board with only a CM109 via USB.
I have a working alsa library, I can play raw audio via the aplay utility and record via arecord ok.
My problem is I don't understand the alsa configuration in enough detail to get it right. At the moment I have an alsa.conf cribbed from google, seems to work but only as a passthough.
# cat /usr/share/alsa/alsa.conf_old pcm.!default { type hw card 0 } ctl.!default { type hw card 0 }
ARM / # lsmod snd_usb_audio 65715 0 - Live 0xbf082000 snd_hwdep 4756 1 snd_usb_audio, Live 0xbf07b000 snd_pcm 54351 1 snd_usb_audio, Live 0xbf062000 snd_timer 14870 1 snd_pcm, Live 0xbf058000 snd_page_alloc 3336 1 snd_pcm, Live 0xbf052000 snd_usbmidi_lib 14853 1 snd_usb_audio, Live 0xbf048000 snd_rawmidi 14657 1 snd_usbmidi_lib, Live 0xbf03d000 snd_seq_device 4675 1 snd_rawmidi, Live 0xbf036000 cm109 6943 0 - Live 0xbf011000 dm9601 5583 0 - Live 0xbf00a000 usbnet 11888 1 dm9601, Live 0xbf000000 ARM / # cat /proc/asound/cards 0 [default ]: USB-Audio - Generic USB Audio Device Generic USB Audio Device at usb-ep93xx-3, full speed ARM / # cat /proc/asound/devices 0: [ 0] : control 16: [ 0- 0]: digital audio playback 24: [ 0- 0]: digital audio capture 33: : timer ARM / #
I do not have enough of a machine or distribution to use the alsaconf utility. Could someone help me with an alsa.conf that will do what roughly what I am after :
IE to allow an application to open N channels each 22050Hz 16 bit mono to be mixed and resampled for an output via a CM109 that only provides 44.1 or 48Khz 16 bit interleaved ... phew ...
Thanks, Jon
Its bad form, but here is a follow up to my own thread in the hope somebody will guide my through this maze ?
ALSA lib timer.c:189:(snd_timer_open_noupdate) Unknown timer hw:CLASS=3,SCLASS=0,CARD=0,DEV=0,SUBDEV=0 ALSA lib timer.c:189:(snd_timer_open_noupdate) Unknown timer hw:CLASS=3,SCLASS=0,CARD=0,DEV=0,SUBDEV=0 ALSA lib pcm_direct.c:1118:(snd1_pcm_direct_initialize_poll_fd) unable to open timer 'hw:CLASS=3,SCLASS=0,CARD=0,DEV=0,SUBDEV=0' ALSA lib pcm_dmix.c:1095:(snd_pcm_dmix_open) unable to initialize poll_fd aplay: main:682: audio open error: No such file or directory ARM # cat /usr/share/alsa/alsa.conf pcm.snd_card { type hw card 0 device 0 }
pcm.!default { type plug slave.pcm "dmixer" }
pcm.dsp0 { type plug slave.pcm "dmixer" }
pcm.dmixer { type dmix ipc_key 1024 slave { pcm "snd_card" period_time 0 period_size 1024 buffer_size 8192 # periods 128 rate 44100 } bindings { 0 0 1 1 } }
ctl.mixer0 { type hw card 0 }
ARM # lsmod snd_usb_audio 65715 0 - Live 0xbf082000 snd_hwdep 4756 1 snd_usb_audio, Live 0xbf07b000 snd_pcm 54351 1 snd_usb_audio, Live 0xbf062000 snd_timer 14870 1 snd_pcm, Live 0xbf058000 snd_page_alloc 3336 1 snd_pcm, Live 0xbf052000 snd_usbmidi_lib 14853 1 snd_usb_audio, Live 0xbf048000 snd_rawmidi 14657 1 snd_usbmidi_lib, Live 0xbf03d000 snd_seq_device 4675 1 snd_rawmidi, Live 0xbf036000 cm109 6943 0 - Live 0xbf011000 dm9601 5583 0 - Live 0xbf00a000 usbnet 11888 1 dm9601, Live 0xbf000000
this alsa.conf works, but with no digital mixer pcm.!default { type hw card 0 } ctl.!default { type hw card 0 }
# cat /proc/asound/version Advanced Linux Sound Architecture Driver Version 1.0.23.
ARM # cat /proc/asound/cards 0 [default ]: USB-Audio - Generic USB Audio Device Generic USB Audio Device at usb-ep93xx-3, full speed ARM # cat /proc/asound/devices 0: [ 0] : control 16: [ 0- 0]: digital audio playback 24: [ 0- 0]: digital audio capture 33: : timer
http://alsa.opensrc.org/Dmix NOTE: For ALSA 1.0.9rc2 and higher you don't need to setup dmix for analogue output. Dmix is enabled by default for soundcards which don't support hardware mixing. You still need to set it up for digital outputs.
Yea ..... right .....
Jonathan Andrews wrote:
ALSA lib timer.c:189:(snd_timer_open_noupdate) Unknown timer hw:CLASS=3,SCLASS=0,CARD=0,DEV=0,SUBDEV=0
ARM # cat /usr/share/alsa/alsa.conf ...
You have deleted alsa-lib's basic device definitions. Device-specific definitions are supposed to go into /usr/share/alsa/cards/. Your definitions look as if they are supposed to go into /etc/asound.conf.
Regards, Clemens
On Tue, 2012-02-07 at 22:44 +0100, Clemens Ladisch wrote:
Jonathan Andrews wrote:
ALSA lib timer.c:189:(snd_timer_open_noupdate) Unknown timer hw:CLASS=3,SCLASS=0,CARD=0,DEV=0,SUBDEV=0
ARM # cat /usr/share/alsa/alsa.conf ...
You have deleted alsa-lib's basic device definitions. Device-specific definitions are supposed to go into /usr/share/alsa/cards/. Your definitions look as if they are supposed to go into /etc/asound.conf.
Thanks for the reply. I've failed to create the basic device definitions..
I have alsa-lib-1.0.25 cross compiled from source, the libs are installed and alsa-utils-1.0.25 has been built against it.
The snag is alsaconf seems broken (fails to exec) and as I don't have an ldd that works with arm i'm a bit bust, everything else in alsa-utils seems to at least execute ....
Do I need to split the config across files, I only want one device on this board and i'm limited in space. I have kernel+kernel modules +busybox+some libs+alsautils partially working and i'm out of flash..
I figured as I need only one device on one board that will never change I could hand code it, is it a requirement to split the config. This is destined to be a single task machine.
Thanks, Jon
participants (2)
-
Clemens Ladisch -
Jonathan Andrews