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This directory contains tools, scripts and other files to test the
deinterlace plugin.
File overview
-------------
cpudt/cpudt.c
CPU feature detection. Use like "if cpudt mmx; then ..."
Possible features are mmx, 3dnow, sse, sse2, sse3, altivec
and others. Used by emulator.sh.
dicmp/dicmp.c
Compares YUYV images, kind of a specialized version of cmp. Type
dicmp --help for options. Used by ditest-x86.sh.
ditest/ditest.c/guard.h
Runs a deinterlace method with test data. guard.h adds a miniature
version of efence, testing for image buffer overflows. Type ditest
--help for options. Used by ditest scripts.
ditest-all.sh
A shell function wrapping ditest, which runs through all
deinterlace methods using pseudo random input and storing
results in a subdirectory. May use an emulator if we
cross-compile or the CPU lacks the required feature. Used by
other ditest scripts.
ditest-scalar|mmx|3dnow|sse|sse2|sse3|altivec.sh
make check runs these scripts to check if each implementation
of each deinterlace method we compiled produces the output
recorded in md5sums-*. Supposed to reveal compiler bugs.
ditest-x86.sh
Uses ditest-all.sh to run all x86 implementations of all
deinterlace methods which are executable on this machine and
compare the output with dicmp. Supposed to prove all x86
implementations (mmx, sse, ...) produce the same output, but
due to subtle differences and shortcuts for performance reasons
we cannot compare all implementations. Something like this
should also be used to compare sse2 and altivec output.
Differences can be traced to the offending instruction by
strategically placing fprintf-stderr's and vdump()'s in the
source, then diff'ing the stderr output of the failed ditest
runs.
emulator.sh
A shell function to determine if our CPU supports the required
feature or if we can emulate it, currently using qemu. Sets $emu
to the name of the emulator. Used by ditest-all.sh.
gen-md5sums.sh
This script uses ditest-all.sh to generate reference output
for a make check. It runs through all implementations (mmx,
sse, ...) of all deinterlace methods which are executable on
this machine. Since reference output is too large to ship we
compute md5 checksums. Supposed to be run after deinterlace
sources changed.
md5sums-scalar|mmx|3dnow|sse|sse2|sse3|altivec
Checksums for make check.
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