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

[bugtrack@alsa-project.org]

The following issue has been set as RELATED TO issue 0000521.
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<https://bugtrack.alsa-project.org/alsa-bug/view.php?id=758> 
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Reported By:                croiset
Assigned To:                
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Project:                    ALSA - driver
Issue ID:                   758
Category:                   PCI - RME 96
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     new
Distribution:               Redhat 7.2
Kernel Version:             2.4.7
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Date Submitted:             12-29-2004 10:15 CET
Last Modified:              09-14-2005 16:16 CEST
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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.
======================================================================
Relationships       ID      Summary
----------------------------------------------------------------------
related to          0000521 Jack + Alsa not working in full duplex,...
======================================================================

----------------------------------------------------------------------
 tiwai - 12-29-04 14:17 
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I guess the first OSS app opens the file with O_RW?

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 croiset - 12-29-04 14:54 
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I use nas for playing. This application open the device in write mode
only.

cf nas.conf option : readwrite "no"  # for open(device, O_WRONLY|O_SYNC,
0666);
This exact configuration is working with all cards I have except the RME
96/8.

The recorder open the device like that : open(_opt->device,
O_RDONLY|O_NONBLOCK )

----------------------------------------------------------------------
 tiwai - 12-29-04 17:39 
----------------------------------------------------------------------
Hmm, I don't see problems in rme96.c.
Could you check whether the devices are really opened in O_WRONLY and
O_RDONLY?  Maybe strace can show better.
Also, you can check /proc/asound/card0/pcm*/sub0/* files as the current
state, too.

----------------------------------------------------------------------
 croiset - 12-29-04 17:56 
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For the RO and WO only I am sure because I play and record via a symlink,
so I change the symlink to a new card and restart the two processes and it
works ! For the recorder and nas I am sure, I verify in my logs in the
debug mode.

I have this kind of information (if you need some more information do not
hesitate :

# cat /proc/asound/card0/pcm0p/sub0/hw_params
access: RW_INTERLEAVED
format: S16_LE
subformat: STD
channels: 2
rate: 44100 (44100/1)
period_size: 512
buffer_size: 16384
tick_time: 10000
OSS format: S16_LE
OSS channels: 2
OSS rate: 44100
OSS period bytes: 2048
OSS periods: 32
OSS period frames: 512

------------
# cat /proc/asound/card0/pcm0p/sub0/sw_params
tstamp_mode: NONE
period_step: 1
sleep_min: 0
avail_min: 1
xfer_align: 1
start_threshold: 1
stop_threshold: 16384
silence_threshold: 528
silence_size: 528
boundary: 1073741824

--------------
# cat /proc/asound/card0/pcm0c/sub0/hw_params
closed

--------------
# cat /proc/asound/card0/pcm0c/sub0/info
card: 0
device: 0
subdevice: 0
stream: CAPTURE
id: Digi96 IEC958
name: Digi96 IEC958
subname: subdevice #0
class: 0
subclass: 0
subdevices_count: 1
subdevices_avail: 1

------------------------
# cat /proc/asound/card0/pcm0c/sub0/sw_params
closed

------------------------
# cat /proc/asound/card0/pcm0c/sub0/status
closed

----------------------------------------------------------------------
 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 #0
class: 0
subclass: 0
subdevices_count: 1
subdevices_avail: 0



----------------------------------------------------------------------
 croiset - 01-03-05 16:30 
----------------------------------------------------------------------
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                          
09-14-05 16:16 jdthood        Relationship added       related to 0000521  
======================================================================




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