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// Copyright (C) 2022 LTN Global Communications, Inc.
// Contact: Jan Alexander Steffens (heftig) <jan.steffens@ltnglobal.com>
//
// This Source Code Form is subject to the terms of the Mozilla Public License, v2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at
// <https://mozilla.org/MPL/2.0/>.
//
// SPDX-License-Identifier: MPL-2.0
use gio::prelude::*;
use gst::{glib, prelude::*};
use gtk::prelude::*;
use std::cell::{Cell, RefCell};
struct DroppingProbe(glib::WeakRef<gst::Pad>, Option<gst::PadProbeId>);
impl DroppingProbe {
fn install(pad: &gst::Pad) -> Self {
let probe_id = pad
.add_probe(gst::PadProbeType::BUFFER, |_, _| gst::PadProbeReturn::Drop)
.unwrap();
Self(pad.downgrade(), Some(probe_id))
}
}
impl Drop for DroppingProbe {
fn drop(&mut self) {
if let Some((pad, probe_id)) = self.0.upgrade().zip(self.1.take()) {
pad.remove_probe(probe_id);
}
}
}
fn create_pipeline() -> gst::Pipeline {
gst::parse::launch(
r#"videotestsrc name=vsrc is-live=1
! video/x-raw,framerate=60/1,width=800,height=600
! identity single-segment=1
! timeoverlay text="Pre:"
! queue
! livesync latency=50000000
! videorate
! timeoverlay text="Post:" halignment=right
! queue
! gtk4paintablesink name=vsink
audiotestsrc name=asrc is-live=1
! audio/x-raw,channels=2
! identity single-segment=1
! queue
! livesync latency=50000000
! audiorate
! queue
! autoaudiosink
"#,
)
.expect("Failed to create pipeline")
.downcast()
.unwrap()
}
fn create_window(app: >k::Application) {
let pipeline = create_pipeline();
let video_src_pad = pipeline.by_name("vsrc").unwrap().static_pad("src").unwrap();
let audio_src_pad = pipeline.by_name("asrc").unwrap().static_pad("src").unwrap();
let window = gtk::ApplicationWindow::new(app);
window.set_default_size(800, 684);
let vbox = gtk::Box::new(gtk::Orientation::Vertical, 0);
let picture = gtk::Picture::new();
let paintable = pipeline
.by_name("vsink")
.unwrap()
.property::<gtk::gdk::Paintable>("paintable");
picture.set_paintable(Some(&paintable));
vbox.append(&picture);
let action_bar = gtk::ActionBar::new();
vbox.append(&action_bar);
let offset_spin = gtk::SpinButton::with_range(0.0, 500.0, 100.0);
action_bar.pack_start(&offset_spin);
{
let video_src_pad = video_src_pad.clone();
let audio_src_pad = audio_src_pad.clone();
offset_spin.connect_value_notify(move |offset_spin| {
const MSECOND: f64 = gst::ClockTime::MSECOND.nseconds() as _;
let offset = (offset_spin.value() * -MSECOND) as i64;
video_src_pad.set_offset(offset);
audio_src_pad.set_offset(offset);
});
}
let drop_button = gtk::ToggleButton::with_label("Drop Signal");
action_bar.pack_end(&drop_button);
let drop_ids = Cell::new(None);
drop_button.connect_toggled(move |drop_button| {
if drop_button.is_active() {
let video_probe = DroppingProbe::install(&video_src_pad);
let audio_probe = DroppingProbe::install(&audio_src_pad);
drop_ids.set(Some((video_probe, audio_probe)));
} else {
drop_ids.set(None);
}
});
let bus_watch = {
let bus = pipeline.bus().unwrap();
let window = window.downgrade();
bus.add_watch_local(move |_, msg| {
use gst::MessageView;
match msg.view() {
MessageView::Eos(..) => {
if let Some(window) = window.upgrade() {
window.close();
}
}
MessageView::Error(err) => {
eprintln!(
"Error from {}: {} ({:?})",
msg.src().map(|s| s.path_string()).as_deref().unwrap_or(""),
err.error(),
err.debug(),
);
if let Some(window) = window.upgrade() {
window.close();
}
}
_ => (),
};
glib::ControlFlow::Continue
})
.unwrap()
};
{
let pipeline = pipeline.clone();
window.connect_realize(move |_| {
pipeline
.set_state(gst::State::Playing)
.expect("Failed to start pipeline");
});
}
let bus_watch = RefCell::new(Some(bus_watch));
window.connect_unrealize(move |_| {
drop(bus_watch.borrow_mut().take());
pipeline
.set_state(gst::State::Null)
.expect("Failed to stop pipeline");
});
window.set_child(Some(&vbox));
window.show();
}
fn main() -> glib::ExitCode {
let app = gtk::Application::new(
Some("gtk-plugins-rs.gtk-livesync"),
gio::ApplicationFlags::FLAGS_NONE,
);
app.connect_startup(move |_app| {
gst::init().expect("Failed to initialize GStreamer");
gstlivesync::plugin_register_static().expect("Failed to register livesync plugin");
gstgtk4::plugin_register_static().expect("Failed to register gstgtk4 plugin");
});
app.connect_activate(create_window);
app.run()
}
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