Implement MediaDevices.enumerateDevices()

5 files changed, 147 insertions, 2 deletions

diff --git a/components/script/dom/mediadeviceinfo.rs b/components/script/dom/mediadeviceinfo.rs
new file mode 100644
index 00000000000..29d63027952
--- /dev/null
+++ b/components/script/dom/mediadeviceinfo.rs
@@ -0,0 +1,85 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use crate::dom::bindings::codegen::Bindings::MediaDeviceInfoBinding::MediaDeviceInfoMethods;
+use crate::dom::bindings::codegen::Bindings::MediaDeviceInfoBinding::MediaDeviceKind;
+use crate::dom::bindings::reflector::{reflect_dom_object, Reflector};
+use crate::dom::bindings::root::DomRoot;
+use crate::dom::bindings::str::DOMString;
+use crate::dom::globalscope::GlobalScope;
+use dom_struct::dom_struct;
+use servo_media::streams::device_monitor::MediaDeviceKind as ServoMediaDeviceKind;
+
+#[dom_struct]
+pub struct MediaDeviceInfo {
+    reflector_: Reflector,
+    device_id: DOMString,
+    kind: MediaDeviceKind,
+    label: DOMString,
+    group_id: DOMString,
+}
+
+impl MediaDeviceInfo {
+    fn new_inherited(
+        device_id: &str,
+        kind: MediaDeviceKind,
+        label: &str,
+        group_id: &str,
+    ) -> MediaDeviceInfo {
+        MediaDeviceInfo {
+            reflector_: Reflector::new(),
+            device_id: DOMString::from(device_id),
+            kind,
+            label: DOMString::from(label),
+            group_id: DOMString::from(group_id),
+        }
+    }
+
+    pub fn new(
+        global: &GlobalScope,
+        device_id: &str,
+        kind: MediaDeviceKind,
+        label: &str,
+        group_id: &str,
+    ) -> DomRoot<MediaDeviceInfo> {
+        reflect_dom_object(
+            Box::new(MediaDeviceInfo::new_inherited(
+                device_id, kind, label, group_id,
+            )),
+            global,
+        )
+    }
+}
+
+impl MediaDeviceInfoMethods for MediaDeviceInfo {
+    /// https://w3c.github.io/mediacapture-main/#dom-mediadeviceinfo-deviceid
+    fn DeviceId(&self) -> DOMString {
+        self.device_id.clone()
+    }
+
+    /// https://w3c.github.io/mediacapture-main/#dom-mediadeviceinfo-kind
+    fn Kind(&self) -> MediaDeviceKind {
+        self.kind
+    }
+
+    /// https://w3c.github.io/mediacapture-main/#dom-mediadeviceinfo-label
+    fn Label(&self) -> DOMString {
+        self.label.clone()
+    }
+
+    /// https://w3c.github.io/mediacapture-main/#dom-mediadeviceinfo-groupid
+    fn GroupId(&self) -> DOMString {
+        self.group_id.clone()
+    }
+}
+
+impl From<ServoMediaDeviceKind> for MediaDeviceKind {
+    fn from(kind: ServoMediaDeviceKind) -> MediaDeviceKind {
+        match kind {
+            ServoMediaDeviceKind::AudioInput => MediaDeviceKind::Audioinput,
+            ServoMediaDeviceKind::AudioOutput => MediaDeviceKind::Audiooutput,
+            ServoMediaDeviceKind::VideoInput => MediaDeviceKind::Videoinput,
+        }
+    }
+}
diff --git a/components/script/dom/mediadevices.rs b/components/script/dom/mediadevices.rs
index 1352cf4b128..b1f00a154be 100644
--- a/components/script/dom/mediadevices.rs
+++ b/components/script/dom/mediadevices.rs
@@ -12,10 +12,11 @@ use crate::dom::bindings::reflector::DomObject;
 use crate::dom::bindings::root::DomRoot;
 use crate::dom::eventtarget::EventTarget;
 use crate::dom::globalscope::GlobalScope;
+use crate::dom::mediadeviceinfo::MediaDeviceInfo;
 use crate::dom::mediastream::MediaStream;
 use crate::dom::mediastreamtrack::MediaStreamTrack;
 use crate::dom::promise::Promise;
-use crate::realms::InRealm;
+use crate::realms::{AlreadyInRealm, InRealm};
 use dom_struct::dom_struct;
 use servo_media::streams::capture::{Constrain, ConstrainRange, MediaTrackConstraintSet};
 use servo_media::streams::MediaStreamType;
@@ -62,6 +63,43 @@ impl MediaDevicesMethods for MediaDevices {
         p.resolve_native(&stream);
         p
     }
+
+    /// https://w3c.github.io/mediacapture-main/#dom-mediadevices-enumeratedevices
+    fn EnumerateDevices(&self) -> Rc<Promise> {
+        // Step 1.
+        let global = self.global();
+        let in_realm_proof = AlreadyInRealm::assert(&global);
+        let p = Promise::new_in_current_realm(&global, InRealm::Already(&in_realm_proof));
+
+        // Step 2.
+        // XXX These steps should be run in parallel.
+        // XXX Steps 2.1 - 2.4
+
+        // Step 2.5
+        let media = ServoMedia::get().unwrap();
+        let device_monitor = media.get_device_monitor();
+        let result_list = match device_monitor.enumerate_devices() {
+            Ok(devices) => devices
+                .iter()
+                .map(|device| {
+                    // XXX The media backend has no way to group devices yet.
+                    MediaDeviceInfo::new(
+                        &self.global(),
+                        &device.device_id,
+                        device.kind.into(),
+                        &device.label,
+                        "",
+                    )
+                })
+                .collect(),
+            Err(_) => Vec::new(),
+        };
+
+        p.resolve_native(&result_list);
+
+        // Step 3.
+        p
+    }
 }
 
 fn convert_constraints(js: &BooleanOrMediaTrackConstraints) -> Option<MediaTrackConstraintSet> {
diff --git a/components/script/dom/mod.rs b/components/script/dom/mod.rs
index 33a6d9e1bdc..7508838c15d 100644
--- a/components/script/dom/mod.rs
+++ b/components/script/dom/mod.rs
@@ -425,6 +425,7 @@ pub mod imagedata;
 pub mod inputevent;
 pub mod keyboardevent;
 pub mod location;
+pub mod mediadeviceinfo;
 pub mod mediadevices;
 pub mod mediaelementaudiosourcenode;
 pub mod mediaerror;
diff --git a/components/script/dom/webidls/MediaDeviceInfo.webidl b/components/script/dom/webidls/MediaDeviceInfo.webidl
new file mode 100644
index 00000000000..ab24f8046f9
--- /dev/null
+++ b/components/script/dom/webidls/MediaDeviceInfo.webidl
@@ -0,0 +1,21 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+ // https://w3c.github.io/mediacapture-main/#device-info
+
+[Exposed=Window,
+SecureContext, Pref="dom.webrtc.enabled"]
+interface MediaDeviceInfo {
+  readonly attribute DOMString deviceId;
+  readonly attribute MediaDeviceKind kind;
+  readonly attribute DOMString label;
+  readonly attribute DOMString groupId;
+  [Default] object toJSON();
+};
+
+enum MediaDeviceKind {
+  "audioinput",
+  "audiooutput",
+  "videoinput"
+};
diff --git a/components/script/dom/webidls/MediaDevices.webidl b/components/script/dom/webidls/MediaDevices.webidl
index 0d9c3b9e98b..53e6c3599a4 100644
--- a/components/script/dom/webidls/MediaDevices.webidl
+++ b/components/script/dom/webidls/MediaDevices.webidl
@@ -8,7 +8,7 @@
 SecureContext, Pref="dom.webrtc.enabled"]
 interface MediaDevices : EventTarget {
     //                attribute EventHandler ondevicechange;
-    // Promise<sequence<MediaDeviceInfo>> enumerateDevices();
+    Promise<sequence<MediaDeviceInfo>> enumerateDevices();
 };
 
 partial interface Navigator {