Returns whether rescaling is enabled for an encoder.  This will be used
with texture-based encoders to determine whether to fall back to
RAM-based encoding instead.

Audio packets are always considered keyframe packets, so if they weren't
already, mark them as keyframe packets.

`obs_sceneitem_group_add_item` and `obs_Sceneitem_group_remove_item`
were leaving the affected scene in an inconsistent state.

To resolve, simplify and make the code more readable, we replace the
manual linked lists mutation with existing `detach_sceneitem` and
`attach_sceneitem` calls.

Adds API:
obs_scene_add_group2
obs_scene_insert_group2
obs_sceneitem_group_ungroup2

These functions should be used by plugins if they need to use these
functions and need to send a refresh signal.  If a major API rework ever
happens the old functions should be removed.  The old functions should
eventually be deprecated.

The reason why specifying a 'signal' parameter is useful is because it's
a bit more seamless for the user interface to be able to have custom
handling of these specific cases.  It looks better and doesn't require
completely erasing/recreating the entire list, which is visually
unappealing.

Fixes a bug where the UI would not know that a group had been updated.

This signal is used to specify when a scene needs a full refresh of its
item list.

Non-static inline functions don't work for some reason.

Previously the assertion required the idx to be smaller than the number
of elements in the darray. This would mean you could not insert anything
at the end of a darray, and would make it impossible to insert an array
into an empty darray.

Same as obs_scene_find_source but also searches groups within the scene.

SIMDE was introduced for aarch64 support, however, the library itself
supports non-SIMD fallback, which allows us provide support to other
platforms without code changes.

There is another world beyond x86. So we can simply enable SIMDE for
processors without SSE2 support.
Signed-off-by: NJiaxun Yang <jiaxun.yang@flygoat.com>

Avoid collisions with other libraries that define DEPRECATED.

Can't implement all at once because of AMF submodule.

This allows the ability to do things such as change defaults or
properties of sources without necessarily breaking older user
configurations that had older defaults or properties.

This logs the Windows release version (e.g. 1809, 1903, etc)

This uses three methods of obtaining the actual windows version,
RtlGetVersion which is the ntdll version of GetVersionEx that bypasses
the manifest check garbage, looking up the file version of a file that
is most likely to be updated per windows version (ntoskrnl), and the
registry.  Of the three values, it chooses the highest windows version
obtained by the three.

Closes obsproject/obs-studio#2294

ppc64le was fixed before, but ppc64 (big-endian) was still failing.

Allows the ability for manual transitioning to smoothly flow
(interpolate) to the intended transition point over a short period of
time rather than simply setting a hard transition point number.  Doing
this allows manual transitioning to occur more smoothly, and in a more
visually pleasant way.

Allows the ability to manually specify the transitioning point so the
user can transition at a custom rate, usually done by a device that can
be used as a T-bar
Co-authored-by: NJim <obs.jim@gmail.com>

When obs_properties_remove_by_name is called on any obs_properties_t*,
it corrupts the pointers for first_property and last which end up
pointing at either unallocated memory or randomly into the heap memory.
Neither of these is a good thing, and it usually leads to rapid
unscheduled program behavior, also known as crashing and security
issues.

This fixes the issue by first checking if the pointer stored in
props->last is identical to &cur->next, then checking if we are the
only element (cur is also prev element), and if we are then the pointer
is fixed to point back at props->first_property. Additionally fixes
props->first_property which was never updated either.

Also fix some mip calculations along the way.

Closes obsproject/obs-studio#2224

sysctlbyname requires #include <sys/sysctl.h>.  Perhaps this previously
worked due to header pollution that has since been cleaned up in newer
FreeBSD.

sse-intrin.h is a required header now, but the implicit path
breaks building addons once the headers are installed.

Fix this by making the path explicit.

Add arch checks to enable aarch-compat layer on aarch64, retain normal
gcc intrinsics on x86 and ppc64.

Add a compatibility layer utilizing simde
(https://github.com/nemequ/simde) to allow compilation on aarch64
without modifying existing functions.

Qt seems to force STA, so it's misleading to ask for MTA and ignore the
failure result, so just ask for STA. Also, don't uninitialize COM if
initialization failed.

Ensures that hotkeys cannot become invalid if config data is moved over
to another operating system.