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examples/gtkvideooverlay: Make sure to only declare GDK C functions for the right platform

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Otherwise linking might fail depending on the compiler flags if the
linker does not remove all references to unused code.
This commit is contained in:
Sebastian Dröge 2019-07-06 02:17:57 +03:00
parent 27f0d86068
commit 39ea788835
1 changed files with 71 additions and 64 deletions
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135
examples/src/bin/gtkvideooverlay.rs
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@ -43,6 +43,75 @@ use std::cell::RefCell;
use std::process;
#[cfg(all(target_os = "linux", feature = "gtkvideooverlay-x11"))]
fn create_video_sink() -> gst::Element {
// When we are on linux with the Xorg display server, we use the
// X11 protocol's XV extension, which allows to overlay regions
// with video streams. For this, we use the xvimagesink element.
gst::ElementFactory::make("xvimagesink", None).unwrap()
}
#[cfg(all(target_os = "linux", feature = "gtkvideooverlay-x11"))]
fn set_window_handle(video_overlay: &gst_video::VideoOverlay, gdk_window: &gdk::Window) {
let display_type_name = gdk_window.get_display().get_type().name();
// Check if we're using X11 or ...
if display_type_name == "GdkX11Display" {
extern "C" {
pub fn gdk_x11_window_get_xid(window: *mut glib::object::GObject) -> *mut c_void;
}
// This is unsafe because the "window handle" we pass here is basically like a raw pointer.
// If a wrong value were to be passed here (and you can pass any integer), then the window
// system will most likely cause the application to crash.
#[allow(clippy::cast_ptr_alignment)]
unsafe {
// Here we ask gdk what native window handle we got assigned for
// our video region from the window system, and then we will
// pass this unique identifier to the overlay provided by our
// sink - so the sink can then arrange the overlay.
let xid = gdk_x11_window_get_xid(gdk_window.as_ptr() as *mut _);
video_overlay.set_window_handle(xid as usize);
}
} else {
println!("Add support for display type '{}'", display_type_name);
process::exit(-1);
}
}
#[cfg(all(target_os = "macos", feature = "gtkvideooverlay-quartz"))]
fn create_video_sink() -> gst::Element {
// On Mac, this is done by overlaying a window region with an
// OpenGL-texture, using the glimagesink element.
gst::ElementFactory::make("glimagesink", None).unwrap()
}
#[cfg(all(target_os = "macos", feature = "gtkvideooverlay-quartz"))]
fn set_window_handle(video_overlay: &gst_video::VideoOverlay, gdk_window: &gdk::Window) {
let display_type_name = gdk_window.get_display().get_type().name();
if display_type_name == "GdkQuartzDisplay" {
extern "C" {
pub fn gdk_quartz_window_get_nsview(window: *mut glib::object::GObject) -> *mut c_void;
}
// This is unsafe because the "window handle" we pass here is basically like a raw pointer.
// If a wrong value were to be passed here (and you can pass any integer), then the window
// system will most likely cause the application to crash.
#[allow(clippy::cast_ptr_alignment)]
unsafe {
// Here we ask gdk what native window handle we got assigned for
// our video region from the windowing system, and then we will
// pass this unique identifier to the overlay provided by our
// sink - so the sink can then arrange the overlay.
let window = gdk_quartz_window_get_nsview(gdk_window.as_ptr() as *mut _);
video_overlay.set_window_handle(window as usize);
}
} else {
println!("Unsupported display type '{}", display_type_name);
process::exit(-1);
}
}
fn create_ui(app: &gtk::Application) {
let pipeline = gst::Pipeline::new(None);
let src = gst::ElementFactory::make("videotestsrc", None).unwrap();
@ -50,18 +119,7 @@ fn create_ui(app: &gtk::Application) {
// Since using the window system to overlay our gui window is making
// direct contact with the windowing system, this is highly platform-
// specific. This example supports Linux and Mac (using X11 and Quartz).
let sink = if cfg!(feature = "gtkvideooverlay-x11") {
// When we are on linux with the Xorg display server, we use the
// X11 protocol's XV extension, which allows to overlay regions
// with video streams. For this, we use the xvimagesink element.
gst::ElementFactory::make("xvimagesink", None).unwrap()
} else if cfg!(feature = "gtkvideooverlay-quartz") {
// On Mac, this is done by overlaying a window region with an
// OpenGL-texture, using the glimagesink element.
gst::ElementFactory::make("glimagesink", None).unwrap()
} else {
unreachable!()
};
let sink = create_video_sink();
pipeline.add_many(&[&src, &sink]).unwrap();
src.link(&sink).unwrap();
@ -114,58 +172,7 @@ fn create_ui(app: &gtk::Application) {
process::exit(-1);
}
let display_type_name = gdk_window.get_display().get_type().name();
if cfg!(feature = "gtkvideooverlay-x11") {
// Check if we're using X11 or ...
if display_type_name == "GdkX11Display" {
extern "C" {
pub fn gdk_x11_window_get_xid(
window: *mut glib::object::GObject,
) -> *mut c_void;
}
// This is unsafe because the "window handle" we pass here is basically like a raw pointer.
// If a wrong value were to be passed here (and you can pass any integer), then the window
// system will most likely cause the application to crash.
#[allow(clippy::cast_ptr_alignment)]
unsafe {
// Here we ask gdk what native window handle we got assigned for
// our video region from the window system, and then we will
// pass this unique identifier to the overlay provided by our
// sink - so the sink can then arrange the overlay.
let xid = gdk_x11_window_get_xid(gdk_window.as_ptr() as *mut _);
video_overlay.set_window_handle(xid as usize);
}
} else {
println!("Add support for display type '{}'", display_type_name);
process::exit(-1);
}
} else if cfg!(feature = "gtkvideooverlay-quartz") {
if display_type_name == "GdkQuartzDisplay" {
extern "C" {
pub fn gdk_quartz_window_get_nsview(
window: *mut glib::object::GObject,
) -> *mut c_void;
}
// This is unsafe because the "window handle" we pass here is basically like a raw pointer.
// If a wrong value were to be passed here (and you can pass any integer), then the window
// system will most likely cause the application to crash.
#[allow(clippy::cast_ptr_alignment)]
unsafe {
// Here we ask gdk what native window handle we got assigned for
// our video region from the windowing system, and then we will
// pass this unique identifier to the overlay provided by our
// sink - so the sink can then arrange the overlay.
let window = gdk_quartz_window_get_nsview(gdk_window.as_ptr() as *mut _);
video_overlay.set_window_handle(window as usize);
}
} else {
println!("Unsupported display type '{}", display_type_name);
process::exit(-1);
}
}
set_window_handle(&video_overlay, &gdk_window);
});
vbox.pack_start(&video_window, true, true, 0);