webrtcstats: Document all RTP missing fields according to the latest spec

Just document all the missing fields and document which ones will never
be implemented because they depend on the codec or depayloader

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1766>

webrtcstats: RTCP computed RTT is only available at sender

The receiver doesn't have the information to compute it.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1766>

webrtcstats: Remove redundant lines

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1766>

webrtc: Also remove rtcp_transport from the structure

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1765>

webrtc: Remove APIs to set transport on sender/receiver

They're not not used ever.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1765>

webrtc: Remove non rtcp-mux code

RTCP mux is now always required by the WebRTC spec

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1765>

nvcodec: Assume 25fps if framerate is invalid when calculating latency

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1826>

codecs: h264decoder: fix memory leak

gst_h264_dbp_get_picture_all() returns a full transfer of the GArray, which
needs be unrefed. But it is not unrefed in
gst_h264_decoder_find_first_field_picture() leaking it.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1827>

mpegts: Documentation fixes

gtk-doc was complaining :)

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1825>

qroverlay: unset executable flag on source files

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1824>

qroverlay: fix auto detection of json-glib for plugin

Only want to check for json-glib when libqrencode was found,
but also it shouldn't be required but depend on the option.

Fixes #1465

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1824>

d3d11: Add support for packed 4:2:2 and 4:4:4 10bits formats

Add support for Y210 and Y410 formats which are commonly used format
for en/decoders on Windows. Note that those formats cannot be used for
render target (output) of shader.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1821>

openh264dec: Accept constrained-high and progressive-high profiles

They're just subsets of the high profile.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1634>

d3d11h264dec: Accept constrained-high and progressive-high profiles

They're just subsets of the high profile.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1634>

msdkh264dec: Accept constrained-high and progressive-high profiles

They're just subsets of the high profile.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1634>

nvdec: Accept progressive-high and contrained-high profiles

They're subsets of the high profiles with no interlacing and
no B-frames for constrained

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1634>

codecparsers: av1: add the set_operating_point() API.

The av1 can support multi layers when scalability is enabled. We
need an API to set the operating point and filter the OBUs just
belonging to some layers(the layers are specified by the operating
point).

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1464>

codecparsers: av1: Add an API to reset the annex_b state only.

In practice, we encounter streams that have one or more temporal units
error. When that kind of error temporal units is in annex b format, the
whole temporal unit should be discarded.
But the temporal units before it are correct and can be used. More
important, because of the error temporal unit, the parser is in a wrong
state and all later temporal unit are also parsed uncorrectly.
We need to add this API to reset the annex_b state only when we meet
some temporal unit error.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1464>

codecparsers: av1: clean the seen_frame_header in parse_tile_group().

The current seen_frame_header is not cleaned correctly. According
to the spec, it should be cleaned when tiles are parsed completely.
Also delete a verbose seen_frame_header init in reset_state().

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1464>

codecparsers: av1: fix a typo in parse_metadata_scalability

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1464>

codecparsers: av1: Do not assert in identify_one_obu when check annex b size.

Some buggy stream just writes the wrong temporal unit and frame size in
the stream. We should return failure rather than assert to abort.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1464>

codecparsers: av1: Add unknow AV1 profile define for saint check.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1464>

codecparsers: av1: Improve the parse_tile_info.

1. store more tile info when parse tile group.
   The column, row, tile offset and tile data size are all useful for
   decoder process, especially for HW kind decoder such as VAAPI dec.
   Also fix the tile group skip size for each tile data.
2. No min_inner_tile_width requirement in newest spec.
3. Calculate the sbs of each tile for both uniform tile and non-uniformi
   tile.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1464>

codecparsers: av1: Fix a tile info read typo in frame header.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1464>

codecparsers: av1: Fix a typo when get value of segmentation params.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1464>

codecparsers: av1: add valid check for global motion params.

The global motion params and its matrix values need to be verified
before we use them. If it is invalid, we should notify the decoder
that it should not be used.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1464>

codecparsers: av1: uint8 range is not enough for av1_bitstreamfn_ns

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1464>

codecparsers: av1: delete duplicated GST_AV1_GM_ABS_ALPHA_BITS define.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1464>

test: av1parser: update the test result because of bug fixing.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1464>

codecparsers: av1: Improve the loop filter setting.

1. loop_filter_ref_deltas should be int because it needs to compare
   with 0.
2. Move the loop filter init logic to setup_past_independence() and
   load_previous(), which make it more precise with the spec.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1464>

codecparsers: av1: Fix a error report for metadata obu.

The metadata OBUs, for example, ITUT_T35 has an undefined payload such
as itu_t_t35_payload_bytes field in AV1 spec, which may cause the failure
of parsing the trailings bits. We can give a warning and ignore this kind
of errors.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1464>

codecparsers: av1: Fix a level index bug in sequence.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1464>

codecparsers: av1: all ref idx should be gint8.

All the ref index need to compare with 0 in reference index decision
algorithm. We also need to init them to -1.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1464>

va: h264dec: Add support for interlaced stream

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1812>

va: h264dec: implement gst_va_h264_dec_new_field_picture()

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1812>

va: h264dec: Fix picture_height_in_mbs_minus1

Fix for interlaced stream (when sps->frame_mbs_only_flag is equal to one)

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1812>

va: h264dec: admit baseline if stream obeys A.2

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1812>

codecs: h264decoder: Add support for field ref picture list modification

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1812>

codecs: h264decoder: Add more option arguments for reference picture getter

In case that "pic_order_cnt_type" is equal to zero, ref picture
list for B slice should not include non-existing picture
as per spec 8.2.4.2.3. And, the second field is not needed
for the process of frame picture reference list construction
since it needs to be frame unit, not field picture in that case.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1812>

codecs: h264decoder: Split gap picture as well if needed

field pair pictures might be required for reference list
depending on context.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1812>

h264dec: Fix POC calculation for type 0

This is mostly for future use as it only fixes the caclulation for interlaced
cases, the case of frame seemed correct already.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1812>

codecs: h264decoder: Don't try to construct RefPicList0 and RefPicList1 if not required

We were trying to construct reference picture list even for
I slice before this commit. Reference list is required only for
P, SP and B slices. Also, if all existing reference pictures
are gap pictures, we don't need to construct lists.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1812>

va: pool: Check the force_videometa for all memory types.

force_videometa should mean that the buffer must use video meta to
map correctly. When the stride or the offset of the alloc_info is
different from the src caps, the downstream must use video meta.
So this flag should not link with the RAW caps only. All kinds of
caps(memory:VAMemory, memory:DMABuf) should have this flag.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1711>

va: basedec: Improve the decide_allocation().

In decide_allocation(), we now just use the other_pool for frames
copy when the src caps is raw. This can make the logic a little
clear. There is no need for us to check the alignment and video
meta again.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1711>

va: basedec: fallback to system memory if downstream caps is any.

When the downstream element reports an ANY caps, and it also fails to
support VideoMeta, we should fallback to the system memory.
Note: the basetransform kind elements never return valid allocation
query before set_caps(). So, if a basetransform return an ANY sink
caps, we always fallback to system memory for it.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1711>

vah264dec: Fix for long term reference picture signalling

Allocate a GArray which is used to fill
VAPictureParameterBufferH264.ReferenceFrames (called per frame),
instead of alloc/free per frame.
Also this commit is to fix the condition where long-term reference
picture is needed for VAPictureParameterBufferH264.ReferenceFrames
entry.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1813>

codecs: h264decoder: Fix MMCO type 1 for interlaced stream

If field_pic_flag of current picture is equal to zero,
both field of reference field pair should be marked as
"unused for reference"

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1810>

codecs: h264decoder: Fix MMCO type 3 for interlaced stream

Depending on short-ref picture corresponding to picNumX value,
there's a condition that only one field should be updated to
be non-reference picture.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1810>

codecs: h264decoder: Split frame picture into field pictures if needed

In case of interlaced stream, frame pictures need to be splitted
into field for reference marking process.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1810>

codecs: h264decoder: Add util macro for frame/field picture identification

Add a macro to check whether given GstH264Picture is for frame or field
decoding.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1810>

d3d11window: Prefer full color range for display target colorspace

We don't need to preserve input color range for transformed target
color space. Also some GPUs doesn't seem to be happy with 16-235
color range for RGB color space.
Also, since our default display target color space is
DXGI_COLOR_SPACE_RGB_FULL_G22_NONE_P709, choosing full color range
would make more sense.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1814>

wpe: Don't crash when running on X11.

Don't assume the available EGL display is a wayland display -
instead, check the the GStreamer GL context is EGL, and then
use gst_gl_display_egl_from_gl_display to create a
GstGLDisplayEGL from that, which also adds refcounting
around the underlying EGLDisplay.

Fixes https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/issues/1385

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1752>

va: allocator: dmabuf: log unknown surface format

It is possible that surface format is not assigned, keeping its default
GStreamer value: unknown, but gst_video_format_to_string() doesn't print
unknown format, so this patch does it manually.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1811>

va: allocator: dmabuf: destroy VASurface if no pooled buffer

When gst_va_dmabuf_allocator_setup_buffer_full() receives info (not NULL) it is
supposed that this buffer is not part of the allocator pool, so it has to be
de-allocated as soon it is freed.

This patch sets the destroy notify of the assigned GstVaBufferSurface if info is
not NULL.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1811>

vah264dec: Allow missing reference picture

baseclass might provide reference picture list with null picture.
Ensure picture before filling picture information.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1809>

codecs: h264decoder: Don't give up to decode due to missing reference picture

Missing reference picture is very common thing for broken/malformed stream.
Decoder should be able to keep decoding if it's not a very critical error.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1809>

mpegtsdemux: Fix off by one error

Turns out timestamps of zero are valid :) Fixes issues with streams where the
PTS/DTS would be equal to the first PCR.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1807>

d3d11h264dec: Add support for interlaced stream

Add support for interlaced stream.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1534>

codecs: h264decoder: Add support for interlaced stream

Initial support for interlaced stream. Subclass should implement
new_field_picture() vfunc. Otherwise, baseclass will assume that
subclass doesn't support interlaced stream.

Restrictions:
* Reference picture modification process for interlaced stream
  is not implemented yet
* PAFF (Picture Adaptive Frame Field) is not properly implemented.
* Field display ordering (e.g., top-field-first) decision should
  be enhanced via picture timing SEI parsing
* Gap in field picture should be handled

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1534>

codecs: h264decoder: Rename DPB methods

Clarify wheter it's for picture(field) or frame in order to
support interlaced stream, because DPB size is frame unit, not picture
in case of interlaced stream.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1534>

codecs: h264decoder: Remove interlaced stream related constraints

... and add new_field_picture() vfunc so that ensure interlaced
decoding support by subclass.
The method will be used later with interlaced stream support.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1534>

codecs: h264decoder: Move to inline GstH264DecoderClass documentation

Don't duplicate documentation for class vfunc. Hotdoc doesn't seem
to be happy with duplicated documentation.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1534>

codecs: h264decoder: Store reference picture type using enum value

Managing reference picture type by using two variables
(ref and long_term) seems to be redundant and that can be
represented by using a single enum value.

This is to sync this implementation with gstreamer-vaapi so that
make comparison between this and gstreamer-vaapi easier and also
in order to minimize the change required for subclass to be able
to support interlaced.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1534>

codecs: h264decoder: Minor documentation fix

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1534>

codecs: h264decoder: Remove DPB size related spammy debug message

It's not informative at all if SPS wasn't updated. Also we are printing
DPB size related debug message in another place already.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1806>

h264parse: try harder to update timecode

NumClockTS is the maximum number of timecodes the pic_timing SEI
can carry, but it is perfectly OK for it to carry fewer, and have
one of the clock_timestamp_flags set to 0.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1804>

h264parse: fix installing of update-timecode property

Simply fixes a typo that did not have any adverse effect,
and avoid hardcoding initializer

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1805>

codecs: h264decoder: Don't fill gap picture if it's not allowed

We should fill gap picture only if sps->gaps_in_frame_num_value_allowed_flag
is set.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1801>

openjpegenc: store stripe offset when encoding image

The decoder can simply read this offset after decoding
to know where to blit the stripe to the full frame

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1800>

openjpegenc: take subsampling into account when calculating stripe height

We calculate minimum of (stripe height * sub sampling) across all components
to ensure that all component dimensions are consistent with sub-sampling.
The last stripe for each component is simply the remaining height.

limit wavelet resolutions for "thin" stripes

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1800>

openjpegenc: fix memory leak from mstream

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1800>

openjpegenc: fail negotation in handle_frame if alignment mismatch

If encoder is in stripe mode, then downstream must also support stripe

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1800>

nvcodec: Fix various typo

Not sure where the DECOCER came from

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1803>

va: comments to explain code

There are a couple part where code seems, at least to me, a bit oscure or
confusing. So let's better add an explanation.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1802>

adaptivedemux: Don't calculate bitrate for header/index fragments

They are generally substantially smaller than regular fragments, and therefore
we end up pushing totally wrong bitrates downstream.

Fixes erratic buffering issues with DASH introduced by
66f5e874352016e29f555e3ce693b23474e476db

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1021>

adaptivedemux: Store QoS values on the element

Storing it per-stream requires taking the manifest lock which can apparenly be
hold for aeons. And since the QoS event comes from the video rendering thread
we *really* do not want to do that.

Storing it as-is in the element is fine, the important part is knowing the
earliest time downstream.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1021>

adaptivedemux: Don't calculate bitrate for header/index fragments

They are generally substantially smaller than regular fragments, and therefore
we end up pushing totally wrong bitrates downstream.

Fixes erratic buffering issues with DASH introduced by
66f5e874352016e29f555e3ce693b23474e476db

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1786>

hlsdemux: Don't double-free variant streams on errors

If an error happened switching to a new variant, we switch back to the previous
one ... except it will be unreffed when settin git.

In order to avoid such issues, keep a reference to the old variant until we're
sure we don't need it anymore

Fixes cases of double-free on variants and its contents

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1799>

codecs: vp8decoder: Fix two typo of struct name.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1797>

gsta2dpsink: Fix GstPad leak

The sinkpad returned by a call to gst_element_get_static_pad needs to be
unrefed.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1621>

bluez: a2dpsink: Add support for LDAC to a2dpsink

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1621>

bluez: avdtpsink: Add support for LDAC to avdtpsink

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1621>

ext: Add LDAC encoder

LDAC is an audio coding technology developed by Sony that enables the
transmission of High-Resolution (Hi-Res) audio contents over Bluetooth.

Currently Adaptive Bit Rate (ABR) as supported by libldac encoder is not
implemented.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1621>

mpegdemux: Set duration on seeking query if possible

Set duration on seeking query in the same way as duration query handler.
Otherwise application might get confused as if the duration is unknown.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1791>

webrtc: Update libnice version requirement to 0.1.17

Since !1366 nice_agent_get_sockets() is used, which requires 0.1.17.
Update the version requirement accordingly.

Fixes #1459.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1792>

hlsdemux: Re-use streams if possible

When switching variants, try to re-use existing streams/pads instead of creating
new ones. When dealing with urisourcebin and decodebin3 this is not only the
expected way but also avoids a lot of buffering/hang issues.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1757>

m3u8: Make a debug function usable elsewhere

The rest of the code might want to use this

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1757>

qroverlay: Generate documentation

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1730>

qroverlay: Add a qroverlay element that allows overlaying any data

This moves `gstqroverlay.c` to `gstdebugqroverlay.c` and implements
a simple `gstqroverlay` element.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1730>

qroverlay: Rename qroverlay to debugqroverlay

The element is specially focus on debugging purposes and not a generique QR overlay

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1730>

qroverlay: Factor out qroverlay logic to a base class

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1730>

qroverlay: Factor out qroverlay logic to a base class

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1730>

qroverlay: Make subclassable

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1730>

qroverlay: Port to VideoFilter

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1730>

qroverlay: Make default pizel-size 3

Otherwise zbar isn't able to read the produced qrcodes

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1730>

qroverlay: Cleanup the way we build the json using json-glib

And reindent the .h file removing tabs

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1730>

qroverlay: Fix copyright

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1730>

qroverlay: Fix some warnings

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1730>

qroverlay: Minor renaming and documentation fixes

Matching usual namings

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1730>

qroverlay: Import from gst-qroverlay

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1730>