Added basic-tutorial-2

Fixes https://github.com/sdroege/gstreamer-rs/pull/33

tutorials/src/bin/basic-tutorial-2.rs

@@ -0,0 +1,58 @@
+extern crate gstreamer as gst;
+
+use gst::prelude::*;
+
+fn main() {
+    // Initialize GStreamer
+    gst::init().unwrap();
+
+    // Create the elements
+    let source = gst::ElementFactory::make("videotestsrc", "source")
+        .expect("Could not create source element.");
+    let sink =
+        gst::ElementFactory::make("autovideosink", "sink").expect("Could not create sink element");
+
+    // Create the empty pipeline
+    let pipeline = gst::Pipeline::new("test-pipeline");
+
+    // Build the pipeline
+    pipeline.add_many(&[&source, &sink]).unwrap();
+    source.link(&sink).expect("Elements could not be linked.");
+
+    // Modify the source's properties
+    source.set_property_from_str("pattern", "smpte");
+
+    // Start playing
+    let ret = pipeline.set_state(gst::State::Playing);
+    assert_ne!(
+        ret,
+        gst::StateChangeReturn::Failure,
+        "Unable to set the pipeline to the Playing state."
+    );
+
+    // Wait until error or EOS
+    let bus = pipeline.get_bus().unwrap();
+    while let Some(msg) = bus.timed_pop(gst::CLOCK_TIME_NONE) {
+        use gst::MessageView;
+        match msg.view() {
+            MessageView::Error(err) => {
+                eprintln!(
+                    "Error received from element {}: {}",
+                    msg.get_src().get_path_string(),
+                    err.get_error()
+                );
+                eprintln!("Debugging information: {:?}", err.get_debug());
+                break;
+            }
+            MessageView::Eos(..) => break,
+            _ => (),
+        }
+    }
+
+    let ret = pipeline.set_state(gst::State::Null);
+    assert_ne!(
+        ret,
+        gst::StateChangeReturn::Failure,
+        "Unable to set the pipeline to the Null state."
+    );
+}