Hello
I am trying to play and record sound on an ARM (big endian) platform using alsa and a USB sound card dongle.
The sound card is detected properly both in dmesg and alsa, and a "Speaker" and "Mic" mixer control is visible in "amixer". Playback works fine. Recording does not work however: when using arecord, it produces a 44 byte large file (size of the wave header?) and seemingly hangs. Running strace with arecord shows that it is waiting on a poll() function (see output below).
I can enable playback on the Mic control, and get the microphone input to play in the speakers, so I know the microphone is working.
The "Mic" mixer control has been unmuted and set to capture via "amixer".
One odd thing is that when using alsamixer (the ncurses interface), it is not possible to set the "Mic" mixer control to Capture with the Space key. Even if set via "amixer" (which seems to work, given the output) does not change how it is visually presented in alsamixer.
Does anyone have any ideas on how I can continue from here on?
I have been banging my head on this for several days, so any help would be appreciated! :)
Also, I've attached output of several files (in case they may help):
# uname -r
2.6.27.44
# cat /proc/asound/version
Advanced Linux Sound Architecture Driver Version 1.0.17.
# amixer
Simple mixer control 'Speaker',0
Capabilities: pvolume pswitch pswitch-joined penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 151
Mono:
Front Left: Playback 150 [99%] [-1.37dB] [on]
Front Right: Playback 150 [99%] [-1.37dB] [on]
Simple mixer control 'Mic',0
Capabilities: pvolume pvolume-joined cvolume cvolume-joined pswitch pswitch-joined cswitch cswitch-joined penum
Playback channels: Mono
Capture channels: Mono
Limits: Playback 0 - 32 Capture 0 - 16
Mono: Playback 31 [97%] [46.50dB] [on] Capture 15 [94%] [22.50dB] [on]
Simple mixer control 'Auto Gain Control',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [on]
# lsmod | grep snd
snd_hda_intel 288462 0 - Live 0xbf12e000
snd_usb_audio 50368 0 - Live 0xbf120000
snd_usb_lib 10176 1 snd_usb_audio, Live 0xbf11c000
snd_rawmidi 11584 1 snd_usb_lib, Live 0xbf118000
snd_pcm 45704 2 snd_hda_intel,snd_usb_audio, Live 0xbf10b000
snd_page_alloc 4232 2 snd_hda_intel,snd_pcm, Live 0xbf108000
snd_timer 13092 1 snd_pcm, Live 0xbf103000
snd_hwdep 3524 1 snd_usb_audio, Live 0xbf101000
snd_seq_device 3628 1 snd_rawmidi, Live 0xbf0ff000
snd 26980 7 snd_hda_intel,snd_usb_audio,snd_rawmidi,snd_pcm,snd_timer,snd_hwdep,snd_seq_device, Live 0xbf0f7000
soundcore 2948 1 snd, Live 0xbf0f5000
# arecord -L
null
Discard all samples (playback) or generate zero samples (capture)
default:CARD=default
C-Media USB Headphone Set , USB Audio
Default Audio Device
# strace arecord
write(1, "RIFF$\0\0\200WAVE", 12RIFF$ WAVE) = 12
write(1, "fmt \20\0\0\0", 8fmt ) = 8
write(1, "\1\0\1\0@\37\0\0@\37\0\0\1\0\10\0", 16@ @ ) = 16
write(1, "data\0\0\0\200", 8data ) = 8
ioctl(4, 0xc0844123, 0x2ada0) = 0
ioctl(4, 0xc0844123, 0x2ada0) = 0
ioctl(4, 0x4142, 0x2ada0) = 0
ioctl(4, 0xc0844123, 0x2ada0) = 0
poll([{fd=4, events=POLLIN|POLLERR|POLLNVAL}], 1, -1
# dmesg
...
snd-usb-audio 1-1:1.0: usb_probe_interface
snd-usb-audio 1-1:1.0: usb_probe_interface - got id
ALSA sound/usb/usbaudio.c:2826: 2:1:1: add audio endpoint 0x1
ALSA sound/usb/usbaudio.c:2826: 2:2:1: add audio endpoint 0x82
ALSA sound/usb/usbmixer.c:988: [13] FU [Mic Playback Switch] ch = 1, val
= 0/1/1
ALSA sound/usb/usbmixer.c:405: cannot set ctl value: req = 0x4, wValue =
0x200, wIndex = 0xd00, type = 4, data = 0x18/0x0
ALSA sound/usb/usbmixer.c:988: [13] FU [Mic Playback Volume] ch = 1, val
= 0/12240/384
ALSA sound/usb/usbmixer.c:988: [9] FU [Speaker Playback Switch] ch = 1,
val = 0/1/1
ALSA sound/usb/usbmixer.c:405: cannot set ctl value: req = 0x4, wValue =
0x201, wIndex = 0x900, type = 4, data = 0x18/0x0
ALSA sound/usb/usbmixer.c:988: [9] FU [Speaker Playback Volume] ch = 2,
val = -7264/-16/48
ALSA sound/usb/usbmixer.c:988: [10] FU [Mic Capture Switch] ch = 1, val
= 0/1/1
ALSA sound/usb/usbmixer.c:405: cannot set ctl value: req = 0x4, wValue =
0x200, wIndex = 0xa00, type = 4, data = 0x18/0x0
ALSA sound/usb/usbmixer.c:988: [10] FU [Mic Capture Volume] ch = 1, val
= 0/6096/384
ALSA sound/usb/usbmixer.c:988: [10] FU [Auto Gain Control] ch = 1, val =
0/1/1
usbcore: registered new interface driver snd-usb-audio
firmware: requesting NPE-C
NPE-C: firmware's license can be found in /usr/share/doc/LICENSE.IPL
NPE-C: firmware functionality 0x5, revision 0x2:1
eth0: link down
eth0: link up, 100Mbps, full-duplex, lpa 0x45E1
ALSA sound/usb/usbaudio.c:1350: setting usb interface 2:1
ALSA sound/usb/usbaudio.c:1350: setting usb interface 2:1
ALSA sound/usb/usbaudio.c:1350: setting usb interface 2:1
ALSA sound/usb/usbaudio.c:1350: setting usb interface 2:1
ALSA sound/usb/usbaudio.c:1350: setting usb interface 2:1
...
--
Tim SjÃstrand, Software Developer
Communication Research Labs Sweden AB
Address: GrÃndalsvÃgen 19, 392 36 Kalmar, Sweden
E-mail: tim.sjostrand@xxxxxxxxxxxxx
www.crlsweden.com
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