Hello.
I can't get the tricky boundary calculation. Perhaps I'm
missing some obvious thing, or maybe it's really some
circumvent for a specific case that was not commented.
The current calculation for boundary is:
boundary = buffer_size;
while (boundary * 2 <= LONG_MAX - buffer_size)
boundary *= 2;
I've checked out some repositories, specially alsa-driver
in ALSA git, and I realized this calculation exists at
least since 2001. I guess it was Jaroslav who wrote.
Visualization of the calculation (B = buffer_size):
LONG_MAX
-------------------------------
\______________/ \__/
B * 4 B
\______/
B * 2
\__/
B
Why isn't a simpler calculation used instead? e.g.:
/* closest multiple of buffer size less or equal LONG_MAX */
boundary = LONG_MAX - LONG_MAX % buffer_size;
LONG_MAX
-------------------------------
\__________________________/
B * 6
Cheers!
pasquali
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