Rewrote dump_video example to prefer clock_gettime() over ftime().

The ftime method has been removed from POSIX and is depricated on Linux. clock_gettime() work better on Linux, but is not available on Windows, so fall back to ftime() if autotools/scons fail to detect clock_gettime().

Based on proposal in opusfile!9 (closed).

Fixes the following compiler messages:

../../examples/dump_video.c: In function ‘main’:
../../examples/dump_video.c:490:5: warning: ‘ftime’ is deprecated: Use gettimeofday or clock_gettime instead [-Werror=deprecated-declarations]
  490 |     ftime(&start);
      |     ^~~~~
In file included from ../../examples/dump_video.c:40:
/usr/include/x86_64-linux-gnu/sys/timeb.h:29:12: note: declared here
   29 | extern int ftime (struct timeb *__timebuf)
      |            ^~~~~
../../examples/dump_video.c:491:5: warning: ‘ftime’ is deprecated: Use gettimeofday or clock_gettime instead [-Werror=deprecated-declarations]
  491 |     ftime(&last);
      |     ^~~~~
/usr/include/x86_64-linux-gnu/sys/timeb.h:29:12: note: declared here
   29 | extern int ftime (struct timeb *__timebuf)
      |            ^~~~~
../../examples/dump_video.c:505:13: warning: ‘ftime’ is deprecated: Use gettimeofday or clock_gettime instead [-Werror=deprecated-declarations]
  505 |             ftime(&after);
      |             ^~~~~
/usr/include/x86_64-linux-gnu/sys/timeb.h:29:12: note: declared here
   29 | extern int ftime (struct timeb *__timebuf)
      |            ^~~~~

changed the description

The problem is that despite the deprecation of ftime() in 2020, I don't believe that MSVC supports gettimeofday(). ftime() was chosen because it was the only standard(ish) API that was available on both POSIX and Windows systems that gave sub-second resolution.

Please see opusfile!9 (closed) for the approach we took to handle this in opusfile.

added 1 commit

• b05e8ec6 - Replaced use of obsolete ftime() with gettimeofday().

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added 1 commit

• 2e1cd694 - Rewrote to use ftime() when clock_gettime() to work with Windows.

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I adjusted the proposal based on opusfile!9 (closed), dropping use some internal macros. If this approach is accepted, I will squash the merges before it should go into master.

added 3 commits

• 2e1cd694...3446dd66 - 2 commits from branch master
• ec5129f0 - Rewrote dump_video example to prefer clock_gettime() over ftime()

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changed title from Replaced obsolete ftime() with gettimeofday(). to Rewrote dump_video example to prefer clock_gettime() over ftime().

changed the description

added 4 commits

• ec5129f0...47388cd8 - 3 commits from branch master
• a4dff816 - Rewrote dump_video example to prefer clock_gettime() over ftime()

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approved this merge request

added 2 commits

• 46df56a5 - 1 commit from branch master
• 794bf8c6 - Rewrote dump_video example to prefer clock_gettime() over ftime()

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merged manually