Implement video-metadata check

components/script/dom/bindings/trace.rs

@@ -91,6 +91,7 @@ use style::element_state::*;
 use style::properties::PropertyDeclarationBlock;
 use style::selector_impl::{PseudoElement, ElementSnapshot};
 use style::values::specified::Length;
+use time::Duration;
 use url::Origin as UrlOrigin;
 use url::Url;
 use uuid::Uuid;
@@ -109,6 +110,8 @@ no_jsmanaged_fields!(EncodingRef);
 
 no_jsmanaged_fields!(Reflector);
 
+no_jsmanaged_fields!(Duration);
+
 /// Trace a `JSVal`.
 pub fn trace_jsval(tracer: *mut JSTracer, description: &str, val: &Heap<JSVal>) {
     unsafe {

components/script/dom/htmlmediaelement.rs

@@ -35,6 +35,7 @@ use string_cache::Atom;
 use task_source::TaskSource;
 use time::{self, Timespec, Duration};
 use url::Url;
+use video_metadata;
 
 struct HTMLMediaElementContext {
     /// The element that initiated the request.
@@ -88,11 +89,24 @@ impl AsyncResponseListener for HTMLMediaElementContext {
         // https://html.spec.whatwg.org/multipage/#media-data-processing-steps-list
         // => "Once enough of the media data has been fetched to determine the duration..."
         if !self.have_metadata {
-            //TODO: actually check if the payload contains the full metadata
-
-            // Step 6
-            elem.change_ready_state(HAVE_METADATA);
-            self.have_metadata = true;
+            match video_metadata::get_format_from_slice(&self.data) {
+                Ok(meta) => {
+                    let dur = meta.duration.unwrap_or(::std::time::Duration::new(0, 0));
+                    *elem.video.borrow_mut() = Some(VideoMedia {
+                        format: format!("{:?}", meta.format),
+                        duration: Duration::seconds(dur.as_secs() as i64) +
+                                  Duration::nanoseconds(dur.subsec_nanos() as i64),
+                        width: meta.size.width,
+                        height: meta.size.height,
+                        video: meta.video,
+                        audio: meta.audio,
+                    });
+                    // Step 6
+                    elem.change_ready_state(HAVE_METADATA);
+                    self.have_metadata = true;
+                }
+                _ => {}
+            }
         } else {
             elem.change_ready_state(HAVE_CURRENT_DATA);
         }
@@ -164,6 +178,17 @@ impl HTMLMediaElementContext {
     }
 }
 
+#[derive(JSTraceable, HeapSizeOf)]
+pub struct VideoMedia {
+    format: String,
+    #[ignore_heap_size_of = "defined in time"]
+    duration: Duration,
+    width: u32,
+    height: u32,
+    video: String,
+    audio: Option<String>,
+}
+
 #[dom_struct]
 pub struct HTMLMediaElement {
     htmlelement: HTMLElement,
@@ -175,6 +200,7 @@ pub struct HTMLMediaElement {
     error: MutNullableHeap<JS<MediaError>>,
     paused: Cell<bool>,
     autoplaying: Cell<bool>,
+    video: DOMRefCell<Option<VideoMedia>>,
 }
 
 impl HTMLMediaElement {
@@ -192,6 +218,7 @@ impl HTMLMediaElement {
             error: Default::default(),
             paused: Cell::new(true),
             autoplaying: Cell::new(true),
+            video: DOMRefCell::new(None),
         }
     }