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This commit adds support for raw payloads such as L24 audio to `webrtcsink` & `webrtcsrc`. Most changes take place within the `Codec` helper structure: * A `Codec` can now advertise a depayloader. This also ensures that a format not only can be decoded when necessary, but it can also be depayloaded in the first place. * It is possible to declare raw `Codec`s, meaning that their caps are compatible with a payloader and a depayloader without the need for an encoder and decoder. * Previous accessor `has_decoder` was renamed as `can_be_received` to account for codecs which can be handled by an available depayloader with or without the need for a decoder. * New codecs were added for the following formats: * L24, L16, L8 audio. * RAW video. The `webrtc-precise-sync` examples were updated to demonstrate streaming of raw audio or video. Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1501>
