[PD] fluid~, shabby~, shaffy~ segfaults

[Frank Barknecht]

Hallo,

[I'm slowly taking this over to pd-dev...]

guenter geiger hat gesagt: // guenter geiger wrote:

> Strangly enough the last time we did latency tests using the
> OSS layer for ALSA, we discovered that the OSS layer showed
> by far better performance than the ALSA implementation.
> (Because it uses blocking I/O, which gives better time resolution)
> So there should be no reason not to run pd under OSS until
> we have time to fix the ALSA I/O (which should be supported
> by portaudio actually)

I couldn't get Pd and OSS-emu work together with my M-Audio Quattro in
4-channel mode. :( That's my personal reason. To use the Quattro this
way some .asoundrc magic is needed, and at least I couldn't transfer
this to OSS-devices.

Regarding portaudio:

I came a little bit farther along in activating the ALSA interface of
Portaudio in Pd. I replaced all portaudio files except the pablio
directory with current PA-cvs.

I then had to edit the Makefiles by hand, replace PA_USEAPI_OSS ->
PA...ALSA, add "-lasound" to the final linking and remove -Werror.
After that Pd compiled and ran, but it couldn't open the ALSA sound
devices. The error message is:

ALSA lib pcm_hw.c:1078:(snd_pcm_hw_open) open /dev/snd/pcmC2D0c failed: No such file or directory
ALSA lib pcm_hw.c:1078:(snd_pcm_hw_open) open /dev/snd/pcmC2D0p failed: No such file or directory
	^- this also happens with the test programs and might be harmless
input device 0, output device 0
nchan 2, flags 3, bufs 8, framesperbuf 256
ALSA call at line 381 succeeded
ALSA call at line 388 succeeded
ALSA format: 10
ALSA call at line 423 succeeded
ALSA call at line 426 succeeded
Error executing ALSA call, line 429
Error number -9993 occured opening portaudio stream
Error message: Illegal combination of I/O devices

I guess, that maybe my main card, the M-Audio Audiophile is creating
this error. It is a stereo card, but the chipset (ICE1712) has 10 in-
and 12 out-channels. The line numbers above refer to pa_linux_alsa.c
where it fails at line 429, which says:

    /* ... set the number of channels */
    ENSURE( snd_pcm_hw_params_set_channels( stream, hw_params, channels ) );

The three alsa-enabled pa_test programs do work, for example
patest_sine, even when compiled with Pd's pabilo changes.

Maybe this rings a bell with someone?

ciao
-- 
 Frank Barknecht                               _ ______footils.org__