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examples: zoom effect with compositor and navigations events
Use can change the video player zoom using the next keys:
* +: Zoom in
* -: Zoom out
* Up/Down/Right/Left: Move the frame
* r: reset the zoom
Also mouse navigation events can be used for a better UX.
Furthermore, it works with an pipeline using other video compositor
filters like glvideomixer. For instance:
glvideomixer \
name=mix background=1 \
sink_0::xpos=0 sink_0::ypos=0 sink_0::zorder=0 \
sink_0::width={WIDTH} sink_0::height={HEIGHT} \
! glimagesinkelement \
gltestsrc pattern=mandelbrot name=src \
! video/x-raw(memory:GLMemory),framerate=30/1,width={WIDTH},height={HEIGHT},pixel-aspect-ratio=1/1 \
! queue \
! mix.sink_0
Probe was added in the sink pad to get direct navigation events w/o
transformation done by the mixer. More info about it in the PR [1].
[1] https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1495
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1217>
This commit is contained in:
Ruben Gonzalez
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examples/src/bin/zoom.rs
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examples/src/bin/zoom.rs
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// Zoom example using navigation events and a compositor
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// Use can change the video player zoom using the next keys:
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// * +: Zoom in
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// * -: Zoom out
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// * Up/Down/Right/Left: Move the frame
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// * r: reset the zoom
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// Also mouse navigation events can be used for a better UX.
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use gst::prelude::*;
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use gst_video::video_event::NavigationEvent;
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use std::sync::Mutex;
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#[path = "../examples-common.rs"]
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mod examples_common;
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const WIDTH: i32 = 1280;
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const HEIGHT: i32 = 720;
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#[derive(Default)]
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struct MouseState {
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clicked: bool,
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clicked_x: f64,
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clicked_y: f64,
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clicked_xpos: i32,
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clicked_ypos: i32,
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}
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fn zoom(mixer_sink_pad: gst::Pad, x: i32, y: i32, zoom_in: bool) {
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let xpos = mixer_sink_pad.property::<i32>("xpos");
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let ypos = mixer_sink_pad.property::<i32>("ypos");
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let width = mixer_sink_pad.property::<i32>("width");
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let height = mixer_sink_pad.property::<i32>("height");
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let (width_offset, height_offset) = if zoom_in {
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(WIDTH / 10, HEIGHT / 10)
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} else {
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(-WIDTH / 10, -HEIGHT / 10)
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};
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if width_offset + width <= 0 {
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return;
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}
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mixer_sink_pad.set_property("width", width + width_offset);
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mixer_sink_pad.set_property("height", height + height_offset);
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let xpos_offset = ((x as f32 / WIDTH as f32) * width_offset as f32) as i32;
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let new_xpos = xpos - xpos_offset;
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let ypos_offset = ((y as f32 / HEIGHT as f32) * height_offset as f32) as i32;
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let new_ypos = ypos - ypos_offset;
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if new_xpos != xpos {
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mixer_sink_pad.set_property("xpos", new_xpos);
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}
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if new_ypos != ypos {
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mixer_sink_pad.set_property("ypos", new_ypos);
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}
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}
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fn reset_zoom(mixer_sink_pad: gst::Pad) {
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let xpos = mixer_sink_pad.property::<i32>("xpos");
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let ypos = mixer_sink_pad.property::<i32>("ypos");
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let width = mixer_sink_pad.property::<i32>("width");
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let height = mixer_sink_pad.property::<i32>("height");
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if 0 != xpos {
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mixer_sink_pad.set_property("xpos", 0);
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}
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if 0 != ypos {
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mixer_sink_pad.set_property("ypos", 0);
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}
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if WIDTH != width {
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mixer_sink_pad.set_property("width", WIDTH);
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}
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if HEIGHT != height {
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mixer_sink_pad.set_property("height", HEIGHT);
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}
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}
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fn example_main() {
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let clicked = Mutex::new(MouseState::default());
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gst::init().unwrap();
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let pipeline = gst::parse_launch(&format!(
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"compositor name=mix background=1 sink_0::xpos=0 sink_0::ypos=0 sink_0::zorder=0 sink_0::width={WIDTH} sink_0::height={HEIGHT} ! xvimagesink \
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videotestsrc name=src ! video/x-raw,framerate=30/1,width={WIDTH},height={HEIGHT},pixel-aspect-ratio=1/1 ! queue ! mix.sink_0"
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)).unwrap().downcast::<gst::Pipeline>().unwrap();
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let mixer = pipeline.by_name("mix").unwrap();
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let mixer_src_pad = mixer.static_pad("src").unwrap();
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let mixer_sink_pad_weak = mixer.static_pad("sink_0").unwrap().downgrade();
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// Probe added in the sink pad to get direct navigation events w/o transformation done by the mixer
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mixer_src_pad.add_probe(gst::PadProbeType::EVENT_UPSTREAM, move |_, probe_info| {
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let mixer_sink_pad = mixer_sink_pad_weak.upgrade().unwrap();
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let Some(gst::PadProbeData::Event(ref ev)) = probe_info.data else {
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return gst::PadProbeReturn::Ok;
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};
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if ev.type_() != gst::EventType::Navigation {
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return gst::PadProbeReturn::Ok;
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};
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let Ok(nav_event) = NavigationEvent::parse(ev) else {
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return gst::PadProbeReturn::Ok;
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};
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match nav_event {
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NavigationEvent::KeyPress { key, .. } => match key.as_str() {
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"Left" => {
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let xpos = mixer_sink_pad.property::<i32>("xpos");
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mixer_sink_pad.set_property("xpos", xpos - 10);
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}
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"Right" => {
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let xpos = mixer_sink_pad.property::<i32>("xpos");
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mixer_sink_pad.set_property("xpos", xpos + 10);
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}
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"Up" => {
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let ypos = mixer_sink_pad.property::<i32>("ypos");
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mixer_sink_pad.set_property("ypos", ypos - 10);
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}
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"Down" => {
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let ypos = mixer_sink_pad.property::<i32>("ypos");
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mixer_sink_pad.set_property("ypos", ypos + 10);
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}
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"plus" => {
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zoom(mixer_sink_pad, WIDTH / 2, HEIGHT / 2, true);
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}
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"minus" => {
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zoom(mixer_sink_pad, WIDTH / 2, HEIGHT / 2, false);
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}
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"r" => {
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reset_zoom(mixer_sink_pad);
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}
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_ => (),
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},
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NavigationEvent::MouseMove { x, y, .. } => {
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let state = clicked.lock().unwrap();
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if state.clicked {
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let xpos = mixer_sink_pad.property::<i32>("xpos");
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let ypos = mixer_sink_pad.property::<i32>("ypos");
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let new_xpos = state.clicked_xpos + (x - state.clicked_x) as i32;
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let new_ypos = state.clicked_ypos + (y - state.clicked_y) as i32;
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if new_xpos != xpos {
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mixer_sink_pad.set_property("xpos", new_xpos);
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}
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if new_ypos != ypos {
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mixer_sink_pad.set_property("ypos", new_ypos);
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}
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}
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}
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NavigationEvent::MouseButtonPress { button, x, y, .. } => {
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if button == 1 || button == 272 {
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let mut state = clicked.lock().unwrap();
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state.clicked = true;
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state.clicked_x = x;
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state.clicked_y = y;
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state.clicked_xpos = mixer_sink_pad.property("xpos");
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state.clicked_ypos = mixer_sink_pad.property("ypos");
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} else if button == 2 || button == 3 || button == 274 || button == 273 {
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reset_zoom(mixer_sink_pad);
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} else if button == 4 {
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zoom(mixer_sink_pad, x as i32, y as i32, true);
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} else if button == 5 {
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zoom(mixer_sink_pad, x as i32, y as i32, false);
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}
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}
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NavigationEvent::MouseButtonRelease { button, .. } => {
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if button == 1 || button == 272 {
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let mut state = clicked.lock().unwrap();
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state.clicked = false;
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}
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}
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#[cfg(feature = "v1_18")]
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NavigationEvent::MouseScroll { x, y, delta_y, .. } => {
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if delta_y > 0.0 {
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zoom(mixer_sink_pad, x as i32, y as i32, true);
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} else if delta_y < 0.0 {
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zoom(mixer_sink_pad, x as i32, y as i32, false);
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}
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}
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_ => (),
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}
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gst::PadProbeReturn::Ok
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});
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pipeline
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.set_state(gst::State::Playing)
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.expect("Unable to set the pipeline to the `Playing` state");
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let bus = pipeline.bus().unwrap();
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for msg in bus.iter_timed(gst::ClockTime::NONE) {
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use gst::MessageView;
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match msg.view() {
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MessageView::Eos(..) => {
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println!("received eos");
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break;
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}
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MessageView::Error(err) => {
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println!(
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"Error from {:?}: {} ({:?})",
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err.src().map(|s| s.path_string()),
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err.error(),
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err.debug()
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);
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break;
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}
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_ => (),
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};
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}
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pipeline
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.set_state(gst::State::Null)
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.expect("Unable to set the pipeline to the `Null` state");
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}
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fn main() {
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// tutorials_common::run is only required to set up the application environment on macOS
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// (but not necessary in normal Cocoa applications where this is set up automatically)
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examples_common::run(example_main);
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}
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