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ANGLE_surface_d3d_render_to_back_buffer extension is only available
with Microsoft fork of ANGLE. Note that Microsoft's ANGLE repository
has been deprecated.

This is at least useful for the gst-play-1.0 use case.

To avoid `gst_debug_log_valist: assertion 'category != NULL' failed`
if we do not call gst_dmabuf_allocator_new

Previously we would simply use them without any locking at all, while
using the object lock for setting them. Nothing prevented new callbacks
to be set in the meantime, potentially calling a callback with already
freed user_data.

To prevent this move the callbacks into a reference counted struct and
use the appsrc/appsink mutex to protect access to it, which is used in
all functions calling the callbacks already anyway.

Fixes gstreamer/gst-plugins-base#729

By setting the extension-ID for TWCC (Transport Wide Congestion Control),
the payloader will embed sequencenumbers as a RTP header-extension
according to https://tools.ietf.org/html/draft-holmer-rmcat-transport-wide-cc-extensions-01#section-2

The negotiation of this being enabled with downstream elements
is done with caps reflecting the way this is communicated using SDP.

Some other frameworks need the HWND to retrieve information from.

Compiling with MSVC and Clang.

With commit "basepayload: Expose onvif-no-rate-control property" the rtp
timestamp changed behaviour when rate control is disabled.

When disabling rate control, we must take care of the stream time to
avoid the timestamps to begin from zero again.

When using the cache, we were not using the right GMainContext to setup
next URI to discovery, fix that.

Fixes segfault when the display changes

We need to remove GL resources from the old context instead of the new
GL context.  The two GL context may not even be shared.

_free(params) followed by a params->align is a bad idea :)

Fixes a possible memory leak on renegotiation

Fixes multiple leaks

So that one can parse the GBytes returned by gst_rtp_buffer_get_extension_bytes

This simply implies not trying to "prepare" those buffers,
as mapping an empty buffer to a video frame does not make
much sense.

This also adds a simple test in compositor that performs
some trivial checking of the handling of gap events, the test
was not failing before, but an error was logged, this is
no longer the case.

Fixes #717

If there's no known value in the best caps then the functions to convert
them to strings will return NULL. Having the fields not in the caps is
not a problem, having them with a NULL value however will cause
negotiation failures.

The main_input stream-id would not get reset when going to READY state.
This would cause warnings when trying to reuse the same decodebin3, since
you would get a new STREAM_START event with a new stream-id, which would
collide with the now stale stream-id

The logging is set to warning for a drain event, which is part of the
normal functionality of the parsebin.

Fixes regression introduced by "clean-up" done as part of commit 98ebcb4b.

dummy must live as long as use the return value of localtime_r() since
that's just a pointer to it, and by putting it inside the block we made
dummy go out of scope right after localtime_r() returned, which messed
up the time values since when we poked at the struct the contents might
already have been overwritten.

Fixes #722

The default values were not being set on element initialization. This
was a problem for buffer_duration and buffer_size since they would be
zero initialized, rather then being set to -1. This would cause the
underlaying queue2 element to have no limits and depending on the
streamed file, could cause queue2 to allocate massive amounts of memory.

Similarily to the Theora mapping, process 0:N, N:0 and 0:0 pixel aspect ratios
as 1:1.

Fixes #719

This validate that the base class properly save and return the flow
return value received when gst_rtp_base_depay_push/push_list() helper is
being used.

Save push/push_list helper flow return and in case of failure, return it
in the process function. This allow forwarding downstream flow return
even if the subclass is using the push/push_list helper.

In decodebin3 and uridecodebin3 the `force-sw-decoders` boolean property is
added. In uridecodebin3 it is only a proxy property which will forward
the value to decodebin3.

When decodebin3 has `force-sw-decoders` disabled, it will filter out in its
decoder and decodable factories those elements within the 'Hardware'
class, at reconfiguring output stream.

playbin3 adds by default GST_PLAY_FLAG_FORCE_SW_DECODERS, and sets
`force-sw-decoders` property accordingly to its internal uridecodebin, also
filters out the 'Hardware' class decoder elements when caps
negotiation.

Added `force-sw-decoders` boolean property in decodebin2 and
uridecodebin. By default the property is %FALSE and it bypass the new
code. Otherwise the factory list is filtered removing decoders
within 'Hardware' class.

uridecodebin sets the `force-sw-decoders` property in its internal
decodebin, and also filters out Hardware class in the
autoplug-factories default signal handler.

playbin2 adds by default GST_PLAY_FLAG_FORCE_SW_DECODERS it its flags
property, and depending on it playbin2 sets the `force-sw-decoders`
property on its internal uridecodebin, also filters out the Hardware
class decoding decoders at the autoplug-factories signal handler.

This flag would be common either for playbin2 and playbin3.

So we can build all the OpenGL elements.

You can neither guess nor parse the colorimetry from the
input stream.
Signed-off-by: Randy Li <ayaka@soulik.info>

We don't have to look at each pixel's alpha component because we will
directly write it over the background.

When the playsink's sink is activated its state is set to READY but it remains
unlinked. So, in order for decodebin3 to potentially reuse the context later on,
the whole playbin3 needs to have it internally stored.

Any contexts created by sink during activation need to be propagated
to whole elements of playbin.

code logic very similar to gst_rtsp_url_get_request_uri ()

In prepare_frame, it is not enough for the target info
(conversion_info) to not have changed to decide not to update
the converter, as the vpad info may have changed as well.

Fixes #714

This fixes thread-safety issues and various other minor issues. Our
previous version was about 13 years old.

Fixes #715

Posting any message to parent seems to be pointless. That might break
parent window.
Regardless of the posting, parent window can catch mouse event
and also any keyboard events will be handled by parent window by default.

Fixes: gstreamer/gst-plugins-base#634