forked from mirrors/gstreamer-rs
examples/glupload: Replace separate mpsc channel with winit UserEvent
This commit is contained in:
Marijn Suijten
parent
5e8634e9eb
commit
1609a7c923
1 changed files with 49 additions and 45 deletions
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@ -13,7 +13,6 @@ use std::ffi::CStr;
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use std::mem;
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use std::ptr;
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use std::sync;
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use std::sync::mpsc;
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use anyhow::Error;
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use derive_more::{Display, Error};
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@ -314,12 +313,18 @@ fn load(gl_context: &glutin::WindowedContext<glutin::PossiblyCurrent>) -> Gl {
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}
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}
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#[derive(Debug)]
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enum Message {
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Sample(gst::Sample),
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BusEvent,
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}
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struct App {
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pipeline: gst::Pipeline,
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appsink: gst_app::AppSink,
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glupload: gst::Element,
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bus: gst::Bus,
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event_loop: glutin::event_loop::EventLoop<()>,
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event_loop: glutin::event_loop::EventLoop<Message>,
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windowed_context: glutin::WindowedContext<glutin::PossiblyCurrent>,
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shared_context: gst_gl::GLContext,
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}
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@ -333,7 +338,7 @@ impl App {
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.get_bus()
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.expect("Pipeline without bus. Shouldn't happen!");
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let event_loop = glutin::event_loop::EventLoop::new();
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let event_loop = glutin::event_loop::EventLoop::with_user_event();
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let window = glutin::window::WindowBuilder::new().with_title("GL rendering");
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let windowed_context = glutin::ContextBuilder::new()
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.with_vsync(true)
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@ -447,7 +452,7 @@ impl App {
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_ => (),
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}
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if let Err(e) = event_proxy.lock().unwrap().send_event(()) {
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if let Err(e) = event_proxy.lock().unwrap().send_event(Message::BusEvent) {
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eprintln!("Failed to send BusEvent to event proxy: {}", e)
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}
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@ -468,12 +473,8 @@ impl App {
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})
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}
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fn setup(
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&self,
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event_loop: &glutin::event_loop::EventLoop<()>,
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) -> Result<mpsc::Receiver<gst::Sample>, Error> {
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let events_proxy = event_loop.create_proxy();
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let (sender, receiver) = mpsc::channel();
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fn setup(&self, event_loop: &glutin::event_loop::EventLoop<Message>) -> Result<(), Error> {
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let event_proxy = event_loop.create_proxy();
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self.appsink.set_callbacks(
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gst_app::AppSinkCallbacks::builder()
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.new_sample(move |appsink| {
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@ -504,21 +505,25 @@ impl App {
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})?;
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}
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sender
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.send(sample)
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.map(|_| gst::FlowSuccess::Ok)
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.map_err(|_| gst::FlowError::Error)?;
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event_proxy
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.send_event(Message::Sample(sample))
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.map(|()| gst::FlowSuccess::Ok)
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.map_err(|e| {
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element_error!(
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appsink,
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gst::ResourceError::Failed,
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("Failed to send sample to event loop: {}", e)
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);
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let _ = events_proxy.send_event(());
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Ok(gst::FlowSuccess::Ok)
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gst::FlowError::Error
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})
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})
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.build(),
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);
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self.pipeline.set_state(gst::State::Playing)?;
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Ok(receiver)
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Ok(())
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}
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fn map_gl_api(api: glutin::Api) -> gst_gl::GLAPI {
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@ -601,7 +606,7 @@ impl App {
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}
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fn main_loop(app: App) -> Result<(), Error> {
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let receiver = app.setup(&app.event_loop)?;
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app.setup(&app.event_loop)?;
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println!(
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"Pixel format of the window's GL context {:?}",
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@ -650,38 +655,37 @@ fn main_loop(app: App) -> Result<(), Error> {
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_ => (),
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},
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glutin::event::Event::RedrawRequested(_) => needs_redraw = true,
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_ => (),
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}
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// Receive a frame
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glutin::event::Event::UserEvent(Message::Sample(sample)) => {
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let buffer = sample.get_buffer_owned().unwrap();
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let info = sample
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.get_caps()
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.and_then(|caps| gst_video::VideoInfo::from_caps(caps).ok())
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.unwrap();
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// Handle all pending messages. Whenever there is a message we will
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// wake up the events loop above
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App::handle_messages(&bus).unwrap();
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{
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if gst_gl_context.is_none() {
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gst_gl_context = glupload
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.get_property("context")
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.unwrap()
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.get::<gst_gl::GLContext>()
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.unwrap();
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}
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// get the last frame in channel
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if let Some(sample) = receiver.try_iter().last() {
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let buffer = sample.get_buffer_owned().unwrap();
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let info = sample
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.get_caps()
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.and_then(|caps| gst_video::VideoInfo::from_caps(caps).ok())
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.unwrap();
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{
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if gst_gl_context.is_none() {
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gst_gl_context = glupload
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.get_property("context")
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.unwrap()
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.get::<gst_gl::GLContext>()
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.unwrap();
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let sync_meta = buffer.get_meta::<gst_gl::GLSyncMeta>().unwrap();
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sync_meta.set_sync_point(gst_gl_context.as_ref().unwrap());
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}
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let sync_meta = buffer.get_meta::<gst_gl::GLSyncMeta>().unwrap();
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sync_meta.set_sync_point(gst_gl_context.as_ref().unwrap());
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if let Ok(frame) = gst_video::VideoFrame::from_buffer_readable_gl(buffer, &info) {
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curr_frame = Some(frame);
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needs_redraw = true;
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}
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}
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if let Ok(frame) = gst_video::VideoFrame::from_buffer_readable_gl(buffer, &info) {
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curr_frame = Some(frame);
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needs_redraw = true;
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// Handle all pending messages when we are awaken by set_sync_handler
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glutin::event::Event::UserEvent(Message::BusEvent) => {
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App::handle_messages(&bus).unwrap();
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}
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_ => (),
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}
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if needs_redraw {
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