warning: unused doc comment
--> gstreamer-video/src/video_info.rs:655:37
|
655 | #[cfg_attr(feature = "dox", doc(cfg(feature = "v1_12")))]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
656 | / {
657 | | VideoInfoBuilder {
658 | | format,
659 | | width,
... |
674 | | }
675 | | }
| |_________- rustdoc does not generate documentation for expressions
Also simplify some blocks into expressions which are allowed to have
attributes as well since Rust 1.43.
For the latter introduce an actual opaque type that allows using them
for comparison purposes but is not just a plain u64.
For the former represent them as opaque type around an NonZeroU32. 0 is
the invalid case and does not happen in the majority of functions. Where
it can happen, represent this case by using an Option<_> instead.
This makes it harder to mis-use these types.
Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/issues/209
Concrete events and messages share common attributes which can be factorized in generic builder `struct`s. This reduces noise in the concrete implementations.
Implement `deref` for concrete derivatives of `Event`, `Message` and `Query`. This allows accessing generic methods such as `is_sticky` for events, `get_seqnum` for messages or `is_serialized` for queries and `get_structure` for all.
Building an argument-less message such as eos yields an assertion failure due to the inner structure being null. The short term solution consists in checking that the inner `structure` is not `null` before attempting to insert `other_fields`. The consequence is that `others_fields` defined for argument-less messages will be ignored. A correction will be applied when GStreamer 1.14 is released thank to the introduction of `gst_message_writable_structure` (see https://bugzilla.gnome.org/show_bug.cgi?id=792928). Due to the dependency on GStreamer 1.14, the correction will be only available under the activation of a feature "v1_14".
Events are not affected as the build method the availability of `gst_event_writable_structure` and this function "will never return NULL". However, we can avoid a `structure` allocation for argument-less messages without `other_fields`.
