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The GstTagXmpWriter interface is to be implemented on elements that
provide xmp serialization. It allows users to select which
xmp schemas should be used on serialization.

API: GstTagXmpWriter

https://bugzilla.gnome.org/show_bug.cgi?id=645167

Adds a function to list the available schemas in our xmp lib

https://bugzilla.gnome.org/show_bug.cgi?id=645167

https://bugzilla.gnome.org/show_bug.cgi?id=640705

API: gst_app_stream_type_get_type()
API: GST_TYPE_APP_STREAM_TYPE

https://bugzilla.gnome.org/show_bug.cgi?id=639747

API: gst_encoding_list_available_categories
API: gst_encoding_list_all_targets

API: gst_encoding_profile_find

API: gst_encoding_target_get_profile

https://bugzilla.gnome.org/show_bug.cgi?id=627476

Besides the duration we can also query the seekability of a stream. Use the new
API in the gst-discoverer tool.

API: gst_discoverer_info_get_seekable

Expose a previously internal method to check for multicast addresses.

See #634093

Cruft from before the lib was renamed to pbutils

Rename _get_is_image() to _is_image() and _get_interlaced() to _is_interlaced().

https://bugzilla.gnome.org/show_bug.cgi?id=633311

Make sure the marshaller function isn't exported. As it was
never in a public header file, this should be fine.

There's no reason to make the marshaller public API. Don't install
pbutils-marshal.h header file and use prefix that makes sure the
symbol doesn't get exported.

This adds code to translate the profile_and_level indication from the
MPEG-4 video (ISO/IEC 14496-2) headers to a string profile/level. The
mappings are taken from the spec and Wireshark's code, and might need to
be expanded on.

https://bugzilla.gnome.org/show_bug.cgi?id=617314

API: gst_codec_utils_mpeg4video_get_profile()
API: gst_codec_utils_mpeg4video_get_level()
API: gst_codec_utils_mpeg4video_caps_set_level_and_profile()

This moves AAC profile detection to pbutils, and uses this in
typefindfunctions. This will also be used in qtdemux.

https://bugzilla.gnome.org/show_bug.cgi?id=617314

API: gst_codec_utils_aac_get_profile()
API: codec_utils_aac_caps_set_level_and_profile()

This allows us to add generic codec-specific functionality, like
extracting profile/level data from headers, without having to duplicate
code across demuxers and typefindfunctions.

As a starting point, this moves over AAC level extraction code from
typefindfunctions, so it can be reused in qtdemux, etc.

https://bugzilla.gnome.org/show_bug.cgi?id=617314

API: gst_codec_utils_aac_get_sample_rate_from_index()
API: gst_codec_utils_aac_get_level()

Also update enums.

Fixes #625944