After 2 years I've finally traced and fixed a problem
which was preventing me from using anything after
ALSA 1.0.9b !
In ALSA lib 1.0.9b:
pcm/pcm_generic.c:
int snd_pcm_generic_channel_info()
{
snd_pcm_generic_t *generic = pcm->private_data;
return snd_pcm_channel_info(generic->slave, info);
}
But in ALSA lib 1.0.15:
pcm/pcm_generic.c:
int snd_pcm_generic_channel_info()
{
snd_pcm_generic_t *generic = pcm->private_data;
if (pcm->mmap_shadow) {
/* No own buffer is required - the plugin won't change
* the data on the buffer, or do safely on-the-place
* conversion
*/
return snd_pcm_channel_info(generic->slave, info);
} else {
// Tim: TESTED: This is now called instead of the other one!
/* Allocate own buffer */
return snd_pcm_channel_info_shm(pcm, info, -1);
}
}
My multi PCM consists of a plughw:0,2 and a hw:1,0
In ALSA 1.0.9b, all five PCMs ALSA creates for this arrangement
create their areas with mmap(). And it works.
But in ALSA 1.0.15 my hw:1,0 and its multi PCM areas are
created with mmap(), and my plughw:0,2 and its PCMs areas
are created with malloc().
Can't hear/record any sound from the plughw:0,2 part of the multi.
I have verified that ALSA 1.0.15 is copying the plughw:0,2 HW PCM
areas to its LINEAR PCM areas, but NOT finally to its multi PCM areas.
It just copies all zeros.
That's the reason I hear/record no sound from the plughw:0,2 part
of the multi PCM.
So I reverted the function's code back to 1.0.9b and presto!
It works now, the same as in ALSA 1.0.9b
So please tell me, am I missing something?
Should I add something more to my .asoundrc ?
I see that besides {type multi ... }, there is a {type share ...} defined.
*** Does the 'share' have any use here? Can't find any docs on it.
Also:
Yes, I can see now, why you made this code change.
mmap() has limits, so you switched over to malloc().
Those limits force the user to use small buffers
and/or reduce the number of channels created.
Otherwise aplay, arecord, and jack etc complain mmap() failed.
In ALSA 1.0.9b, and after my change to ALSA 1.0.15,
I tried ulimit() -l, and editing /etc/security/limits.conf
I quadrupled the available locked memory, but aplay, arecord etc
still won't let me increase the buffer size beyond what it
was BEFORE I edited limits.conf
*** What am I doing wrong?
Thanks
Tim.
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