jaroslav,
there is something wrong with either the pcm.c example or with the
documentation in alsa-lib/src/pcm/pcm.c.
the documentation says about snd_pcm_mmap_commit:
'To call this with offset/frames values different from that returned by
snd_pcm_mmap_begin has undefined effects and it has to be avoided.'
and in pcm.c we find
...
err = snd_pcm_mmap_begin(handle, &my_areas, &offset, &frames);
if (err < 0) {
printf("MMAP begin error: %s\n", snd_strerror(err));
exit(EXIT_FAILURE);
}
if (frames > period_size)
frames = period_size;
generate_sine(my_areas, offset, frames, &phase);
err = snd_pcm_mmap_commit(handle, offset, frames);
...
where the frames returned from snd_pcm_mmap_begin is changed in the second
if-statement and this value is passed to snd_pcm_mmap_commit.
can you clarify this, please? it would also be helpful to know what
exactly snd_pcm_mmap_commit does with the value of frames.
tim
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