y4mdenoise does that sort of threading internally. It'll denoise the intensity
plane and color plane separately, plus it has reader threads and writer
threads. I wrote a small thread-related class hierarchy that should be
reusable. If nothing else, it should be inspirational.
BTW, you probably don't want to literally assign a thread to each individual
line -- the system-call overhead of the semaphores would more than outweigh
your processing time. Mutexes are by no means free.
Hope that helps.
Steven Boswell
________________________________
From: Mark Heath <mjp...@silicontrip.org>
To: MJPEG-tools user list <mjpeg-users@lists.sourceforge.net>
Sent: Wednesday, September 21, 2011 3:21 PM
Subject: [Mjpeg-users] writing multi threaded code
Hi Guys,
I'm wondering if anyone has some skeleton C code for writing
multithreaded filters.
Similar to this kind of pseudo code;
while not end of file {
read frame
create threads (number of CPUs)
for y = 1 to height {
while no available threads { wait for a thread to finish; }
run in thread { for x = 1 to width { process pixel} }
}
write frame
}
I've written a temporal bilateral filter and an nl-means filter and
they are slow, so was looking to speed things up on my multi cpu
machines.
If not, I'll see if I can generate my own skeleton.
Thanks
Mark
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