Thanx that cleared a lot.
So I managed now to put it in hw_params and it works in some way.
needed an additional
There is one point I found:
- when I preallocate with for playback and capture
2*4194304 = 8388608 Bytes:
snd_pcm_lib_preallocate_sg_pages_for_all(hdspm->pci, pcm,8388608,8388608))
and then in hw_params for one substream do a:
snd_pcm_lib_malloc_pages(substream, 4194304);
I got a sgbuf with size=8388608 not 4194304. So it takes all the
memory at first.
Then I tried to preallcate 4194304 and it nearly works (see below).
... since in it prealloctes the mem for 2 substreams (seen in pcm_memory.c).
at least I have to allocate one page more = 4194304+4096, to get no
Segmentation fault, but that could be the hardware too, since hdsp
also needs one page more ?
What should be the right way ?
a) Allocating the sum of both ?
b) Acllocate with the value of one substream ?
c) should I call snd_pcm_lib_preallocate_sg_pages_for_all twice ?
(also free pages twice)
mfg winfried
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