Increase readability and robustness, as the test result is not going
to differ if the order of the pixfmts codes changes.

Originally committed as revision 24665 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24658 to svn://svn.ffmpeg.org/ffmpeg/trunk

The corresponding lavfi-pixfmts BE tests are not yet added, as there
are some bugs in the scaler (scaling rgba, argb, bgra, abgr, yuva420p)
which result in differences with the LE reference, and I cannot
visually check the generated files on BE.

Originally committed as revision 24657 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24655 to svn://svn.ffmpeg.org/ffmpeg/trunk

Introduce the function do_lavfi_pixfmts(), and use it for generating a
pixfmts test for each different filter.

Originally committed as revision 24654 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24651 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24650 to svn://svn.ffmpeg.org/ffmpeg/trunk

The 'tar' variable should be set to a command writing a tar archive
of the named files to stdout, typically "tar c" or "tar cf -"

Originally committed as revision 24649 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24648 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24646 to svn://svn.ffmpeg.org/ffmpeg/trunk

Add the lavfi-showfiltfmts dependency in the Makefile, and correctly
use the $target_exec and $target_path variables for invoking the
lavfi-showfiltfmts tool.

Originally committed as revision 24645 to svn://svn.ffmpeg.org/ffmpeg/trunk

otherwise the test will be running whatever ffmpeg is installed on the
host system.

Originally committed as revision 24644 to svn://svn.ffmpeg.org/ffmpeg/trunk

test output files, and add a prefix with the name of the test.
Make per-filter grouping of the generated output files easier, which
is more useful than per-pixel-format grouping.

Originally committed as revision 24643 to svn://svn.ffmpeg.org/ffmpeg/trunk

Consistent with the lavfi pixdesc test code, and slightly improve
readability.

Originally committed as revision 24642 to svn://svn.ffmpeg.org/ffmpeg/trunk

test results and references depend on machine endianess.

Originally committed as revision 24641 to svn://svn.ffmpeg.org/ffmpeg/trunk

simpler and consistent with the names of the other lavfi tests.

Originally committed as revision 24640 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24623 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24542 to svn://svn.ffmpeg.org/ffmpeg/trunk

failures in PPC and ARM.

Originally committed as revision 24541 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24531 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24530 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24529 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24526 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24486 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24485 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24457 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24404 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24396 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24395 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24394 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Thierry Foucu, tfoucu at gmail

Originally committed as revision 24379 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24374 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Rafaël Carré, rafael d carre a gmail

Originally committed as revision 24355 to svn://svn.ffmpeg.org/ffmpeg/trunk

The diff may provide useful information even if the command was
unsuccessful.  The test is still treated as failed in this case.

Originally committed as revision 24353 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24349 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24347 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24345 to svn://svn.ffmpeg.org/ffmpeg/trunk

DIV3 is not supported on default XP and Vista installations (MP43 is).

Originally committed as revision 24343 to svn://svn.ffmpeg.org/ffmpeg/trunk

This test verifies the pixdesc code by comparing the output with and
without a filter which should have no effect on the image.  Since the
available pixel formats depend on the byte order of the machine, a
simple reference checksum is not possible.

The test originally tried to solve this by generating a reference file
on the fly.  The problem with this is that the test framework expects
the reference file in the source tree, and writing to the source tree
is not allowed.

To avoid complicating the test framework, we instead provide two
reference files and select which to use based on the byte order.

Originally committed as revision 24330 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 24318 to svn://svn.ffmpeg.org/ffmpeg/trunk