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Hello
I am working towards using ALSA for playback
and capture on an embedded platform running Linux. The kernel uses ALSA
driver version 1.0.10rc1. I had manually built and installed ALSA library
(v1.0.10) and ALSA utilities (v1.0.10) for the target platform
filesystem. I have a USB audio device (C-Media) connected to the USB
port of the board and it seems to be successfully successfully
detected by the driver.
~ # ls /dev/snd -l
crw-rw---- 1 root root 220, 0 Jan 1 00:00 controlC0 crw-rw---- 1 root root 220, 24 Jan 1 00:00 pcmC0D0c crw-rw---- 1 root root 220, 16 Jan 1 00:00 pcmC0D0p crw-rw---- 1 root root 220, 1 Jan 1 00:00 seq crw-rw---- 1 root root 220, 33 Jan 1 00:00 timer ~ # cat /proc/asound/cards
0 [default ]: USB-Audio - C-Media USB Audio Device C-Media USB Audio Device at usb-asic-ehci-1.4, full speed ~ # cat /proc/asound/devices
1: : sequencer 16: [0- 0]: digital audio playback 24: [0- 0]: digital audio capture 0: [0- 0]: ctl 33: : timer ~ # cat /proc/asound/card0/stream0
C-Media USB Audio Device at usb-asic-ehci-1.4, full speed : USB Audio Playback:
Status: Stop Interface 1 Altset 1 Format: S16_LE Channels: 2 Endpoint: 1 OUT (ADAPTIVE) Rates: 48000, 44100 Capture:
Status: Stop Interface 2 Altset 1 Format: S16_LE Channels: 1 Endpoint: 2 IN (ASYNC) Rates: 48000, 44100 However, when I run ALSA utilities
like aplay, arecord or speaker-test, I observe errors opening the
hardware device which may be related to the configuration on the
filesystem.
~ # aplay -l
**** List of PLAYBACK Hardware Devices **** ALSA lib control.c:817:(snd_ctl_open_noupdate) Invalid CTL hw:0 aplay: device_list:230: control open (0): No such file or directory aplay: conf.c:3109: snd_config_update_free: Assertion `update->count > 0 && update->finfo' failed. Aborted (core dumped) ~ # /home/saurav # aplay -D plughw:0,0
winxp.wav
ALSA lib pcm.c:2099:(snd_pcm_open_noupdate) Unknown PCM plughw:0,0 aplay: main:544: audio open error: No such file or directory /home/saurav # /home/saurav # /home/saurav # speaker-test speaker-test 0.0.8
Playback device is plughw:0,0
Stream parameters are 48000Hz, S16_BE, 1 channels Using 16 octaves of pink noise ALSA lib pcm.c:2099:(snd_pcm_open_noupdate) Unknown PCM plughw:0,0 Playback open error: -2,No such file or directory speaker-test: conf.c:3109: snd_config_update_free: Assertion `update->count > 0 && update->finfo' failed. Aborted (core dumped) /home/saurav # Are these errors from ALSA utility/library
due to the detection of hardware, ALSA configuration files or
something else related to my target device filesystem?
Thanks in advance for any help. Do let me know if
you need any more details.
Best Regards
Saurav
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