mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer-rs.git
synced 2024-11-25 19:11:06 +00:00
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
parent
0056c62cec
commit
0b922b0e89
1 changed files with 229 additions and 0 deletions
229
examples/src/bin/zoom.rs
Normal file
229
examples/src/bin/zoom.rs
Normal file
|
|
@ -0,0 +1,229 @@
|
|||
// Zoom example using navigation events and a compositor
|
||||
|
||||
// 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.
|
||||
|
||||
use gst::prelude::*;
|
||||
use gst_video::video_event::NavigationEvent;
|
||||
use std::sync::Mutex;
|
||||
|
||||
#[path = "../examples-common.rs"]
|
||||
mod examples_common;
|
||||
|
||||
const WIDTH: i32 = 1280;
|
||||
const HEIGHT: i32 = 720;
|
||||
|
||||
#[derive(Default)]
|
||||
struct MouseState {
|
||||
clicked: bool,
|
||||
clicked_x: f64,
|
||||
clicked_y: f64,
|
||||
clicked_xpos: i32,
|
||||
clicked_ypos: i32,
|
||||
}
|
||||
|
||||
fn zoom(mixer_sink_pad: gst::Pad, x: i32, y: i32, zoom_in: bool) {
|
||||
let xpos = mixer_sink_pad.property::<i32>("xpos");
|
||||
let ypos = mixer_sink_pad.property::<i32>("ypos");
|
||||
let width = mixer_sink_pad.property::<i32>("width");
|
||||
let height = mixer_sink_pad.property::<i32>("height");
|
||||
|
||||
let (width_offset, height_offset) = if zoom_in {
|
||||
(WIDTH / 10, HEIGHT / 10)
|
||||
} else {
|
||||
(-WIDTH / 10, -HEIGHT / 10)
|
||||
};
|
||||
|
||||
if width_offset + width <= 0 {
|
||||
return;
|
||||
}
|
||||
|
||||
mixer_sink_pad.set_property("width", width + width_offset);
|
||||
mixer_sink_pad.set_property("height", height + height_offset);
|
||||
|
||||
let xpos_offset = ((x as f32 / WIDTH as f32) * width_offset as f32) as i32;
|
||||
let new_xpos = xpos - xpos_offset;
|
||||
let ypos_offset = ((y as f32 / HEIGHT as f32) * height_offset as f32) as i32;
|
||||
let new_ypos = ypos - ypos_offset;
|
||||
|
||||
if new_xpos != xpos {
|
||||
mixer_sink_pad.set_property("xpos", new_xpos);
|
||||
}
|
||||
if new_ypos != ypos {
|
||||
mixer_sink_pad.set_property("ypos", new_ypos);
|
||||
}
|
||||
}
|
||||
|
||||
fn reset_zoom(mixer_sink_pad: gst::Pad) {
|
||||
let xpos = mixer_sink_pad.property::<i32>("xpos");
|
||||
let ypos = mixer_sink_pad.property::<i32>("ypos");
|
||||
let width = mixer_sink_pad.property::<i32>("width");
|
||||
let height = mixer_sink_pad.property::<i32>("height");
|
||||
|
||||
if 0 != xpos {
|
||||
mixer_sink_pad.set_property("xpos", 0);
|
||||
}
|
||||
if 0 != ypos {
|
||||
mixer_sink_pad.set_property("ypos", 0);
|
||||
}
|
||||
if WIDTH != width {
|
||||
mixer_sink_pad.set_property("width", WIDTH);
|
||||
}
|
||||
if HEIGHT != height {
|
||||
mixer_sink_pad.set_property("height", HEIGHT);
|
||||
}
|
||||
}
|
||||
|
||||
fn example_main() {
|
||||
let clicked = Mutex::new(MouseState::default());
|
||||
|
||||
gst::init().unwrap();
|
||||
|
||||
let pipeline = gst::parse_launch(&format!(
|
||||
"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 \
|
||||
videotestsrc name=src ! video/x-raw,framerate=30/1,width={WIDTH},height={HEIGHT},pixel-aspect-ratio=1/1 ! queue ! mix.sink_0"
|
||||
)).unwrap().downcast::<gst::Pipeline>().unwrap();
|
||||
|
||||
let mixer = pipeline.by_name("mix").unwrap();
|
||||
let mixer_src_pad = mixer.static_pad("src").unwrap();
|
||||
let mixer_sink_pad_weak = mixer.static_pad("sink_0").unwrap().downgrade();
|
||||
|
||||
// Probe added in the sink pad to get direct navigation events w/o transformation done by the mixer
|
||||
mixer_src_pad.add_probe(gst::PadProbeType::EVENT_UPSTREAM, move |_, probe_info| {
|
||||
let mixer_sink_pad = mixer_sink_pad_weak.upgrade().unwrap();
|
||||
|
||||
let Some(gst::PadProbeData::Event(ref ev)) = probe_info.data else {
|
||||
return gst::PadProbeReturn::Ok;
|
||||
};
|
||||
|
||||
if ev.type_() != gst::EventType::Navigation {
|
||||
return gst::PadProbeReturn::Ok;
|
||||
};
|
||||
|
||||
let Ok(nav_event) = NavigationEvent::parse(ev) else {
|
||||
return gst::PadProbeReturn::Ok;
|
||||
};
|
||||
|
||||
match nav_event {
|
||||
NavigationEvent::KeyPress { key, .. } => match key.as_str() {
|
||||
"Left" => {
|
||||
let xpos = mixer_sink_pad.property::<i32>("xpos");
|
||||
mixer_sink_pad.set_property("xpos", xpos - 10);
|
||||
}
|
||||
"Right" => {
|
||||
let xpos = mixer_sink_pad.property::<i32>("xpos");
|
||||
mixer_sink_pad.set_property("xpos", xpos + 10);
|
||||
}
|
||||
"Up" => {
|
||||
let ypos = mixer_sink_pad.property::<i32>("ypos");
|
||||
mixer_sink_pad.set_property("ypos", ypos - 10);
|
||||
}
|
||||
"Down" => {
|
||||
let ypos = mixer_sink_pad.property::<i32>("ypos");
|
||||
mixer_sink_pad.set_property("ypos", ypos + 10);
|
||||
}
|
||||
"plus" => {
|
||||
zoom(mixer_sink_pad, WIDTH / 2, HEIGHT / 2, true);
|
||||
}
|
||||
"minus" => {
|
||||
zoom(mixer_sink_pad, WIDTH / 2, HEIGHT / 2, false);
|
||||
}
|
||||
"r" => {
|
||||
reset_zoom(mixer_sink_pad);
|
||||
}
|
||||
_ => (),
|
||||
},
|
||||
NavigationEvent::MouseMove { x, y, .. } => {
|
||||
let state = clicked.lock().unwrap();
|
||||
if state.clicked {
|
||||
let xpos = mixer_sink_pad.property::<i32>("xpos");
|
||||
let ypos = mixer_sink_pad.property::<i32>("ypos");
|
||||
|
||||
let new_xpos = state.clicked_xpos + (x - state.clicked_x) as i32;
|
||||
let new_ypos = state.clicked_ypos + (y - state.clicked_y) as i32;
|
||||
|
||||
if new_xpos != xpos {
|
||||
mixer_sink_pad.set_property("xpos", new_xpos);
|
||||
}
|
||||
|
||||
if new_ypos != ypos {
|
||||
mixer_sink_pad.set_property("ypos", new_ypos);
|
||||
}
|
||||
}
|
||||
}
|
||||
NavigationEvent::MouseButtonPress { button, x, y, .. } => {
|
||||
if button == 1 || button == 272 {
|
||||
let mut state = clicked.lock().unwrap();
|
||||
state.clicked = true;
|
||||
state.clicked_x = x;
|
||||
state.clicked_y = y;
|
||||
state.clicked_xpos = mixer_sink_pad.property("xpos");
|
||||
state.clicked_ypos = mixer_sink_pad.property("ypos");
|
||||
} else if button == 2 || button == 3 || button == 274 || button == 273 {
|
||||
reset_zoom(mixer_sink_pad);
|
||||
} else if button == 4 {
|
||||
zoom(mixer_sink_pad, x as i32, y as i32, true);
|
||||
} else if button == 5 {
|
||||
zoom(mixer_sink_pad, x as i32, y as i32, false);
|
||||
}
|
||||
}
|
||||
NavigationEvent::MouseButtonRelease { button, .. } => {
|
||||
if button == 1 || button == 272 {
|
||||
let mut state = clicked.lock().unwrap();
|
||||
state.clicked = false;
|
||||
}
|
||||
}
|
||||
#[cfg(feature = "v1_18")]
|
||||
NavigationEvent::MouseScroll { x, y, delta_y, .. } => {
|
||||
if delta_y > 0.0 {
|
||||
zoom(mixer_sink_pad, x as i32, y as i32, true);
|
||||
} else if delta_y < 0.0 {
|
||||
zoom(mixer_sink_pad, x as i32, y as i32, false);
|
||||
}
|
||||
}
|
||||
_ => (),
|
||||
}
|
||||
|
||||
gst::PadProbeReturn::Ok
|
||||
});
|
||||
|
||||
pipeline
|
||||
.set_state(gst::State::Playing)
|
||||
.expect("Unable to set the pipeline to the `Playing` state");
|
||||
|
||||
let bus = pipeline.bus().unwrap();
|
||||
for msg in bus.iter_timed(gst::ClockTime::NONE) {
|
||||
use gst::MessageView;
|
||||
|
||||
match msg.view() {
|
||||
MessageView::Eos(..) => {
|
||||
println!("received eos");
|
||||
break;
|
||||
}
|
||||
MessageView::Error(err) => {
|
||||
println!(
|
||||
"Error from {:?}: {} ({:?})",
|
||||
err.src().map(|s| s.path_string()),
|
||||
err.error(),
|
||||
err.debug()
|
||||
);
|
||||
break;
|
||||
}
|
||||
_ => (),
|
||||
};
|
||||
}
|
||||
|
||||
pipeline
|
||||
.set_state(gst::State::Null)
|
||||
.expect("Unable to set the pipeline to the `Null` state");
|
||||
}
|
||||
|
||||
fn main() {
|
||||
// tutorials_common::run is only required to set up the application environment on macOS
|
||||
// (but not necessary in normal Cocoa applications where this is set up automatically)
|
||||
examples_common::run(example_main);
|
||||
}
|
||||
Loading…
Reference in a new issue