[ALSA - driver 0000758]: Full duplex is not working in OSS emulation.

bugtrack
2005-01-03T15:30:49Z

Last Modified: 01-03-2005 16:30 CET
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Summary: Full duplex is not working in OSS emulation.
Description:
If I play something with one player, I am unable to record something on the
same device.
The same thing ispossible with the other cards I have.
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croiset - 12-29-04 18:18
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I forget one important i think. NAS use the dsp in playback mode I don't
record anything (PS : I want to record in analog mode).

# cat /proc/asound/card0/pcm0p/sub0/info
card: 0
device: 0
subdevice: 0
stream: PLAYBACK
id: Digi96 IEC958
name: Digi96 IEC958
subname: subdevice https://bugtrack.alsa-project.org/alsa-bug/view.php?id=0
class: 0
subclass: 0
subdevices_count: 1
subdevices_avail: 0

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croiset - 01-03-05 16:30
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I made some more tests and the error after an ioctl.

line_fd = open(_opt->device, O_RDONLY|O_NONBLOCK )
-> ok
fcntl(line_fd,F_SETFD,FD_CLOEXEC)
-> ok
ioctl(line_fd, SNDCTL_DSP_SETFRAGMENT, &frag)
-> ok
ioctl(line_fd, SNDCTL_DSP_SETFMT, &afmt)
-> return -1 errno = 16 (Device or resource busy)
ioctl(line_fd, SNDCTL_DSP_CHANNELS, &channels)
-> return -1 errno = 16 (Device or resource busy)
ioctl(line_fd, SNDCTL_DSP_SPEED, &rate)
-> return -1 errno = 16 (Device or resource busy)
read(line_fd, audio_data, size)
-> return -1 errno = 16 (Device or resource busy)

Issue History
Date Modified Username Field Change
======================================================================
12-29-04 10:15 croiset New Issue
12-29-04 10:15 croiset Distribution => Redhat 7.2
12-29-04 10:15 croiset Kernel Version => 2.4.7
12-29-04 14:17 tiwai Note Added: 0002998
12-29-04 14:54 croiset Note Added: 0003000
12-29-04 17:39 tiwai Note Added: 0003004
12-29-04 17:56 croiset Note Added: 0003005
12-29-04 17:59 croiset Note Added: 0003006
12-29-04 18:05 croiset Note Edited: 0003006
12-29-04 18:18 croiset Note Edited: 0003006
01-03-05 16:30 croiset Note Added: 0003067
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