gstreamer: Add Stream::debug() and StreamCollection::debug()

These provide more helpful debug output than just the pointer when
printing.

gstreamer/src/lib.rs

@@ -249,7 +249,7 @@ pub use tag_setter::TagSetterExtManual;
 mod plugin;
 pub use plugin::GstPluginExtManual;
 #[cfg(any(feature = "v1_10", feature = "dox"))]
-mod stream;
+pub mod stream;
 #[cfg(any(feature = "v1_10", feature = "dox"))]
 pub mod stream_collection;
 

gstreamer/src/stream.rs

@@ -8,13 +8,13 @@
 
 use glib::translate::*;
 use gst_sys;
+use std::fmt;
 use Caps;
 use Stream;
 use StreamFlags;
 use StreamType;
 
 impl Stream {
-    #[cfg(any(feature = "v1_10", feature = "dox"))]
     pub fn new(
         stream_id: Option<&str>,
         caps: Option<&Caps>,
@@ -47,4 +47,22 @@ impl Stream {
             }
         }
     }
+
+    pub fn debug(&self) -> Debug {
+        Debug(self)
+    }
+}
+
+pub struct Debug<'a>(&'a Stream);
+
+impl<'a> fmt::Debug for Debug<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_struct("Stream")
+            .field("stream_id", &self.0.get_stream_id())
+            .field("stream_type", &self.0.get_stream_type())
+            .field("stream_flags", &self.0.get_stream_flags())
+            .field("caps", &self.0.get_caps())
+            .field("tags", &self.0.get_tags())
+            .finish()
+    }
 }

gstreamer/src/stream_collection.rs

@@ -8,6 +8,7 @@
 
 use glib::translate::*;
 use gst_sys;
+use std::fmt;
 use Stream;
 use StreamCollection;
 
@@ -126,4 +127,34 @@ impl StreamCollection {
     pub fn is_empty(&self) -> bool {
         self.len() == 0
     }
+
+    pub fn debug(&self) -> Debug {
+        Debug(self)
+    }
+}
+
+pub struct Debug<'a>(&'a StreamCollection);
+
+impl<'a> fmt::Debug for Debug<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        struct Streams<'a>(&'a StreamCollection);
+
+        impl<'a> fmt::Debug for Streams<'a> {
+            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+                let mut f = f.debug_list();
+
+                for stream in self.0.iter() {
+                    f.entry(&stream.debug());
+                }
+
+                f.finish()
+            }
+        }
+
+        let streams = Streams(self.0);
+
+        f.debug_struct("StreamCollection")
+            .field("streams", &streams)
+            .finish()
+    }
 }