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examples: Make use of glib::closure! for the overlay-composition example

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This commit is contained in:
Sebastian Dröge 2022-01-24 14:29:04 +02:00
parent 0d5132a7f0
commit 42583595f2
1 changed files with 114 additions and 115 deletions
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35
examples/src/bin/overlay-composition.rs
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@ -116,7 +116,6 @@ fn create_pipeline() -> Result<gst::Pipeline, Error> {
info: None,
}));
let drawer_clone = drawer.clone();
// Connect to the overlaycomposition element's "draw" signal, which is emitted for
// each videoframe piped through the element. The signal handler needs to
// return a gst_video::VideoOverlayComposition to be drawn on the frame
@ -128,15 +127,15 @@ fn create_pipeline() -> Result<gst::Pipeline, Error> {
//
// In this case, the signal passes the gst::Element and a gst::Sample with
// the current buffer
overlay.connect("draw", false, move |args| {
overlay.connect_closure(
"draw",
false,
glib::closure!(@strong drawer => move |_overlay: &gst::Element,
sample: &gst::Sample| {
use std::f64::consts::PI;
let drawer = &drawer_clone;
let drawer = drawer.lock().unwrap();
// Get the signal's arguments
let _overlay = args[0].get::<gst::Element>().unwrap();
let sample = args[1].get::<gst::Sample>().unwrap();
let buffer = sample.buffer().unwrap();
let timestamp = buffer.pts().unwrap();
@ -242,12 +241,10 @@ fn create_pipeline() -> Result<gst::Pipeline, Error> {
gst_video::VideoOverlayFormatFlags::PREMULTIPLIED_ALPHA,
);
Some(
gst_video::VideoOverlayComposition::new(Some(&rect))
.unwrap()
.to_value(),
)
});
}),
);
// Add a signal handler to the overlay's "caps-changed" signal. This could e.g.
// be called when the sink that we render to does not support resizing the image
@ -256,15 +253,17 @@ fn create_pipeline() -> Result<gst::Pipeline, Error> {
// resize our canvas's size.
// Another possibility for when this might happen is, when our video is a network
// stream that dynamically changes resolution when enough bandwith is available.
overlay.connect("caps-changed", false, move |args| {
let _overlay = args[0].get::<gst::Element>().unwrap();
let caps = args[1].get::<gst::Caps>().unwrap();
overlay.connect_closure(
"caps-changed",
false,
glib::closure!(move |_overlay: &gst::Element,
caps: &gst::Caps,
_width: u32,
_height: u32| {
let mut drawer = drawer.lock().unwrap();
drawer.info = Some(gst_video::VideoInfo::from_caps(&caps).unwrap());
None
});
drawer.info = Some(gst_video::VideoInfo::from_caps(caps).unwrap());
}),
);
Ok(pipeline)
}