As os_gettime_ns() gets large the current scaling methods, mostly by casting
to uint64_t, may lead to numerical overflows. Sweep the code and use
util_mul_div64() where applicable.
Signed-off-by: Hans Petter Selasky <hps@selasky.org>
Code submissions have continually suffered from formatting
inconsistencies that constantly have to be addressed. Using
clang-format simplifies this by making code formatting more consistent,
and allows automation of the code formatting so that maintainers can
focus more on the code itself instead of code formatting.
The async source sync test verifies that async sources are playing back
in sync properly, and the "sync pair (video)" and "sync pair (audio)"
sources test the back-end syncing down to the exact sample via inserting
audio data directly in to the back-end with system timestamps.
For these sources, when the video is white, a C sinewave should be
playing, and when the video is black audio is mute.
