Add basic-tutorial-1 from the GStreamer tutorials

https://cgit.freedesktop.org/gstreamer/gst-docs/tree/examples/tutorials/basic-tutorial-1.c

Cargo.toml

@@ -7,4 +7,5 @@ members = [
   "gstreamer-player",
   "gstreamer-video",
   "examples",
+  "tutorials",
 ]

tutorials/Cargo.toml

+[package]
+name = "tutorials"
+version = "0.9.0"
+authors = ["Sebastian Dröge <sebastian@centricular.com>"]
+
+[dependencies]
+glib = { version = "0.3", git = "https://github.com/gtk-rs/glib" }
+gstreamer = { path = "../gstreamer" }
+
+[badges]
+travis-ci = { repository = "sdroege/gstreamer-rs", branch = "master" }

tutorials/src/bin/basic-tutorial-1.rs

+extern crate gstreamer as gst;
+use gst::prelude::*;
+
+use std::u64;
+
+fn main() {
+    gst::init().unwrap();
+
+    let uri = "https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.webm";
+    let pipeline = gst::parse_launch(&format!("playbin uri={}", uri)).unwrap();
+
+    let ret = pipeline.set_state(gst::State::Playing);
+    assert_ne!(ret, gst::StateChangeReturn::Failure);
+
+    let bus = pipeline.get_bus().unwrap();
+
+    loop {
+        use gst::MessageView;
+
+        let msg = match bus.timed_pop(u64::MAX) {
+            None => break,
+            Some(msg) => msg,
+        };
+
+        match msg.view() {
+            MessageView::Eos(..) => break,
+            MessageView::Error(err) => {
+                println!(
+                    "Error from {}: {} ({:?})",
+                    msg.get_src().get_path_string(),
+                    err.get_error(),
+                    err.get_debug()
+                );
+                break;
+            }
+            _ => (),
+        }
+    }
+
+    let ret = pipeline.set_state(gst::State::Null);
+    assert_ne!(ret, gst::StateChangeReturn::Failure);
+}