Add basic-tutorial-7.rs

Fixes https://github.com/sdroege/gstreamer-rs/pull/42

tutorials/src/bin/basic-tutorial-7.rs

@@ -0,0 +1,78 @@
+extern crate gstreamer as gst;
+use gst::prelude::*;
+
+fn main() {
+    // Initialize GStreamer
+    if let Err(err) = gst::init() {
+        eprintln!("Failed to initialize Gst: {}", err);
+        return;
+    }
+
+    let audio_source = gst::ElementFactory::make("audiotestsrc", "audio_source").unwrap();
+    let tee = gst::ElementFactory::make("tee", "tee").unwrap();
+    let audio_queue = gst::ElementFactory::make("queue", "audio_queue").unwrap();
+    let audio_convert = gst::ElementFactory::make("audioconvert", "audio_convert").unwrap();
+    let audio_resample = gst::ElementFactory::make ("audioresample", "audio_resample").unwrap();
+    let audio_sink = gst::ElementFactory::make("autoaudiosink", "audio_sink").unwrap();
+    let video_queue = gst::ElementFactory::make("queue", "video_queue").unwrap();
+    let visual = gst::ElementFactory::make("wavescope", "visual").unwrap();
+    let video_convert = gst::ElementFactory::make("videoconvert", "video_convert").unwrap();
+    let video_sink = gst::ElementFactory::make ("autovideosink", "video_sink").unwrap();
+
+    let pipeline = gst::Pipeline::new("test-pipeline");
+
+    audio_source.set_property("freq", &215.0).unwrap();
+    visual.set_property_from_str("shader", "none");
+    visual.set_property_from_str("style", "lines");
+
+    pipeline.add_many(&[&audio_source, &tee, &audio_queue, &audio_convert,
+        &audio_resample, &audio_sink, &video_queue, &visual,
+        &video_convert, &video_sink]).unwrap();
+
+    gst::Element::link_many(&[&audio_source, &tee]).unwrap();
+    gst::Element::link_many(&[&audio_queue, &audio_convert, &audio_resample, &audio_sink]).unwrap();
+    gst::Element::link_many(&[&video_queue, &visual, &video_convert, &video_sink]).unwrap();
+
+    let tee_audio_pad = tee.get_request_pad("src_%u").unwrap();
+    println!("Obtained request pad {} for audio branch", tee_audio_pad.get_name());
+    let queue_audio_pad = audio_queue.get_static_pad("sink").unwrap();
+    tee_audio_pad.link(&queue_audio_pad);
+
+    let tee_video_pad = tee.get_request_pad("src_%u").unwrap();
+    println!("Obtained request pad {} for video branch", tee_video_pad.get_name());
+    let queue_video_pad = video_queue.get_static_pad("sink").unwrap();
+    tee_video_pad.link(&queue_video_pad);
+
+    let ret = pipeline.set_state(gst::State::Playing);
+    assert_ne!(
+        ret,
+        gst::StateChangeReturn::Failure,
+        "Unable to set the pipeline to the Playing state."
+    );
+    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,
+            _ => (),
+        }
+    }
+
+    pipeline.set_state(gst::State::Null);
+
+    let ret = pipeline.set_state(gst::State::Null);
+    assert_ne!(
+        ret,
+        gst::StateChangeReturn::Failure,
+        "Unable to set the pipeline to the Null state."
+    );
+}