Lee Revell wrote:
...
> OK, I have posted the latest version:
> 
> http://www.alsa-project.org/~rlrevell/emu10k1-multichannel-v007.patch
> 
> All the known bugs I mentioned have been fixed.  I would like to test
> this version a while before signing off on it, then it should be ready
> to merge.  Since this patch touches almost every file in the driver, I
> can split it up and post it as a series of patches if necessary.
> 
> The mixer controls for multichannel PCM have been fixed and moved to
> IFACE_PCM.  My solution was to use the same emu10k1_pcm_mixer_t
> structure internally as for regular PCM substreams, but only the "mono"
> component is exposed to userspace.
> 
...

I'm having problems with emu10k1-multichannel-v008.patch. I have made a 
test program that demonstrates the bug. The program works alone, but the 
bug is triggered when I play a song in xmms, and at the same time run 
the test program.

The test program is based on patest_sine.c in PortAudio V18.1. It 
repeatedly plays a sine signal for one second. When playing a stereo 
stream it fails to open the oss device the sixth time. And when playing 
a mono stream it fails to open the device the eighth time.

Running the test program again doesn't work at all. I have to stop xmms 
to reset the bug.

Output from test program and PostAudio library:

Stereo stream
-------------
PortAudio Test: output sine wave. SR = 44100, BufSize = 64, devID = 0
Pa_SetupDeviceFormat: could not SNDCTL_DSP_CHANNELS
An error occured while using the portaudio stream
Error number: -10000
Error message: Host error.
PortAudio Test: output sine wave. SR = 44100, BufSize = 64, devID = 0
Pa_QueryDevice: could not get format info
Pa_SetupDeviceFormat: could not SNDCTL_DSP_SETFMT
An error occured while using the portaudio stream
Error number: -10000
Error message: Host error.
PortAudio Test: output sine wave. SR = 44100, BufSize = 64, devID = 0
Pa_QueryDevice: could not get format info
Pa_SetupDeviceFormat: could not SNDCTL_DSP_SETFMT
An error occured while using the portaudio stream
Error number: -10000
Error message: Host error.

Mono stream
-----------
Pa_QueryDevice: no supported sample rate (or SNDCTL_DSP_SPEED ioctl call 
failed). Force 44100 Hz
Pa_SetupDeviceFormat: could not SNDCTL_DSP_SETFMT
An error occured while using the portaudio stream
Error number: -10000
Error message: Host error.
PortAudio Test: output sine wave. SR = 44100, BufSize = 64, devID = 0
Pa_QueryDevice: could not get format info
Pa_SetupDeviceFormat: could not SNDCTL_DSP_SETFMT
An error occured while using the portaudio stream
Error number: -10000
Error message: Host error.


The log also contains several "kernel: first==last, number X, next free 
Y!", where X is 1 or 2, and Y 12,16,26,32,36 or 44.

I hope this helps.

Regards,
Mikael Magnusson