examples: use Cargo.toml required-features

This lets us avoid #ifdef forests

examples/Cargo.toml

@@ -34,3 +34,65 @@ v1_10 = ["gstreamer/v1_10"]
 
 [badges]
 travis-ci = { repository = "sdroege/gstreamer-rs", branch = "master" }
+
+[[bin]]
+name = "appsink"
+
+[[bin]]
+name = "appsrc"
+
+[[bin]]
+name = "decodebin"
+
+[[bin]]
+name = "events"
+
+[[bin]]
+name = "gtksink"
+required-features = ["gtksink"]
+
+[[bin]]
+name = "gtkvideooverlay"
+required-features = ["gtkvideooverlay"]
+
+[[bin]]
+name = "iterator"
+
+[[bin]]
+name = "launch_glib_main"
+
+[[bin]]
+name = "launch"
+
+[[bin]]
+name = "pad_probes"
+
+[[bin]]
+name = "playbin"
+
+[[bin]]
+name = "player"
+required-features = ["gst-player"]
+
+[[bin]]
+name = "queries"
+
+[[bin]]
+name = "rtpfecclient"
+
+[[bin]]
+name = "rtpfecserver"
+
+[[bin]]
+name = "rtsp-server"
+required-features = ["gst-rtsp-server"]
+
+[[bin]]
+name = "tagsetter"
+
+[[bin]]
+name = "toc"
+
+[[bin]]
+name = "tokio"
+required-features = ["tokio"]

examples/src/bin/gtksink.rs

@@ -1,30 +1,19 @@
-#[cfg(feature = "gtksink")]
 extern crate gstreamer as gst;
-#[cfg(feature = "gtksink")]
 use gst::prelude::*;
 
-#[cfg(feature = "gtksink")]
 extern crate glib;
 
-#[cfg(feature = "gtksink")]
 extern crate gio;
-#[cfg(feature = "gtksink")]
 use gio::prelude::*;
 
-#[cfg(feature = "gtksink")]
 extern crate gtk;
-#[cfg(feature = "gtksink")]
 use gtk::prelude::*;
 
-#[cfg(feature = "gtksink")]
 use std::env;
 
-#[cfg(feature = "gtksink")]
 extern crate send_cell;
-#[cfg(feature = "gtksink")]
 use send_cell::SendCell;
 
-#[cfg(feature = "gtksink")]
 fn create_ui(app: &gtk::Application) {
     let pipeline = gst::Pipeline::new(None);
     let src = gst::ElementFactory::make("videotestsrc", None).unwrap();
@@ -109,7 +98,6 @@ fn create_ui(app: &gtk::Application) {
     });
 }
 
-#[cfg(feature = "gtksink")]
 fn main() {
     gst::init().unwrap();
     gtk::init().unwrap();
@@ -120,8 +108,3 @@ fn main() {
     let args = env::args().collect::<Vec<_>>();
     app.run(&args);
 }
-
-#[cfg(not(feature = "gtksink"))]
-fn main() {
-    println!("Please compile with --feature gtksink");
-}

examples/src/bin/gtkvideooverlay.rs

@@ -1,48 +1,30 @@
-#[cfg(feature = "gtkvideooverlay")]
 extern crate gstreamer as gst;
-#[cfg(feature = "gtkvideooverlay")]
 use gst::prelude::*;
 
-#[cfg(feature = "gtkvideooverlay")]
 extern crate gstreamer_video as gst_video;
-#[cfg(feature = "gtkvideooverlay")]
 use gst_video::prelude::*;
 
-#[cfg(feature = "gtkvideooverlay")]
 extern crate glib;
-#[cfg(feature = "gtkvideooverlay")]
 use glib::translate::ToGlibPtr;
 
-#[cfg(feature = "gtkvideooverlay")]
 extern crate gio;
-#[cfg(feature = "gtkvideooverlay")]
 use gio::prelude::*;
 
-#[cfg(feature = "gtkvideooverlay")]
 extern crate gtk;
-#[cfg(feature = "gtkvideooverlay")]
 use gtk::prelude::*;
 
-#[cfg(feature = "gtkvideooverlay")]
 extern crate gdk;
-#[cfg(feature = "gtkvideooverlay")]
 use gdk::prelude::*;
 
-#[cfg(feature = "gtkvideooverlay")]
 use std::env;
 
-#[cfg(feature = "gtkvideooverlay")]
 use std::os::raw::c_void;
 
-#[cfg(feature = "gtkvideooverlay")]
 extern crate send_cell;
-#[cfg(feature = "gtkvideooverlay")]
 use send_cell::SendCell;
 
-#[cfg(feature = "gtkvideooverlay")]
 use std::process;
 
-#[cfg(feature = "gtkvideooverlay")]
 fn create_ui(app: &gtk::Application) {
     let pipeline = gst::Pipeline::new(None);
     let src = gst::ElementFactory::make("videotestsrc", None).unwrap();
@@ -179,7 +161,6 @@ fn create_ui(app: &gtk::Application) {
     });
 }
 
-#[cfg(feature = "gtkvideooverlay")]
 fn main() {
     #[cfg(not(unix))]
     {
@@ -196,8 +177,3 @@ fn main() {
     let args = env::args().collect::<Vec<_>>();
     app.run(&args);
 }
-
-#[cfg(not(feature = "gtkvideooverlay"))]
-fn main() {
-    println!("Please compile with --feature gtkvideooverlay");
-}

examples/src/bin/player.rs

@@ -1,15 +1,11 @@
 extern crate gstreamer as gst;
-#[cfg(feature = "gst-player")]
 use gst::prelude::*;
 
-#[cfg(feature = "gst-player")]
 extern crate gstreamer_player as gst_player;
 
-#[cfg(feature = "gst-player")]
 extern crate glib;
 
 use std::env;
-#[cfg(feature = "gst-player")]
 use std::sync::{Arc, Mutex};
 
 extern crate failure;
@@ -21,7 +17,6 @@ use failure::Error;
 #[path = "../examples-common.rs"]
 mod examples_common;
 
-#[cfg(feature = "gst-player")]
 fn main_loop(uri: &str) -> Result<(), Error> {
     gst::init()?;
 
@@ -78,13 +73,6 @@ fn example_main() {
         std::process::exit(-1)
     };
 
-    #[cfg(not(feature = "gst-player"))]
-    {
-        eprintln!("Feature gst-player is required. Please rebuild with --features gst-player");
-        std::process::exit(-1)
-    }
-
-    #[cfg(feature = "gst-player")]
     match main_loop(uri) {
         Ok(r) => r,
         Err(e) => eprintln!("Error! {}", e),

examples/src/bin/rtsp-server.rs

@@ -1,11 +1,8 @@
-#[cfg(feature = "gst-rtsp-server")]
 use std::env;
 
 extern crate gstreamer as gst;
 
-#[cfg(feature = "gst-rtsp-server")]
 extern crate gstreamer_rtsp_server as gst_rtsp_server;
-#[cfg(feature = "gst-rtsp-server")]
 use gst_rtsp_server::prelude::*;
 
 extern crate glib;
@@ -13,7 +10,6 @@ extern crate glib;
 extern crate failure;
 use failure::Error;
 
-#[cfg(feature = "gst-rtsp-server")]
 #[macro_use]
 extern crate failure_derive;
 
@@ -22,15 +18,12 @@ mod examples_common;
 
 #[derive(Debug, Fail)]
 #[fail(display = "Could not get mount points")]
-#[cfg(feature = "gst-rtsp-server")]
 struct NoMountPoints;
 
 #[derive(Debug, Fail)]
 #[fail(display = "Usage: {} LAUNCH_LINE", _0)]
-#[cfg(feature = "gst-rtsp-server")]
 struct UsageError(String);
 
-#[cfg(feature = "gst-rtsp-server")]
 fn main_loop() -> Result<(), Error> {
     let args: Vec<_> = env::args().collect();
 
@@ -62,16 +55,6 @@ fn main_loop() -> Result<(), Error> {
 
 fn example_main() -> Result<(), Error> {
     gst::init()?;
-
-    #[cfg(not(feature = "gst-rtsp-server"))]
-    {
-        eprintln!(
-            "Feature gst-rtsp-server is required. Please rebuild with --features gst-rtsp-server"
-        );
-        std::process::exit(-1)
-    }
-
-    #[cfg(feature = "gst-rtsp-server")]
     main_loop()
 }
 

examples/src/bin/tokio.rs

@@ -1,25 +1,16 @@
-#[cfg(feature = "tokio")]
 extern crate gstreamer as gst;
-#[cfg(feature = "tokio")]
 use gst::prelude::*;
 
-#[cfg(feature = "tokio")]
 extern crate futures;
-#[cfg(feature = "tokio")]
 use futures::stream::Stream;
-#[cfg(feature = "tokio")]
 extern crate tokio_core;
-#[cfg(feature = "tokio")]
 use tokio_core::reactor::Core;
 
-#[cfg(feature = "tokio")]
 use std::env;
 
-#[cfg(feature = "tokio")]
 #[path = "../examples-common.rs"]
 mod examples_common;
 
-#[cfg(feature = "tokio")]
 fn example_main() {
     let pipeline_str = env::args().collect::<Vec<String>>()[1..].join(" ");
 
@@ -63,14 +54,8 @@ fn example_main() {
     assert_ne!(ret, gst::StateChangeReturn::Failure);
 }
 
-#[cfg(feature = "tokio")]
 fn main() {
     // tutorials_common::run is only required to set up the application environent on macOS
     // (but not necessary in normal Cocoa applications where this is set up autmatically)
     examples_common::run(example_main);
 }
-
-#[cfg(not(feature = "tokio"))]
-fn main() {
-    println!("Please compile with --features tokio");
-}