Initial WebAudio API stubs

components/script/dom/baseaudiocontext.rs

@@ -0,0 +1,79 @@
+/* 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 http://mozilla.org/MPL/2.0/. */
+
+use dom::audiodestinationnode::AudioDestinationNode;
+use dom::bindings::codegen::Bindings::AudioNodeBinding::AudioNodeOptions;
+use dom::bindings::codegen::Bindings::AudioNodeBinding::{ChannelCountMode, ChannelInterpretation};
+use dom::bindings::codegen::Bindings::BaseAudioContextBinding::BaseAudioContextMethods;
+use dom::bindings::codegen::Bindings::BaseAudioContextBinding::AudioContextState;
+use dom::bindings::num::Finite;
+use dom::bindings::reflector::{DomObject, Reflector};
+use dom::bindings::root::DomRoot;
+use dom::globalscope::GlobalScope;
+use dom::promise::Promise;
+use dom_struct::dom_struct;
+use std::rc::Rc;
+
+#[dom_struct]
+pub struct BaseAudioContext {
+    reflector_: Reflector,
+    destination: Option<DomRoot<AudioDestinationNode>>,
+    sample_rate: f32,
+    current_time: f64,
+    state: AudioContextState,
+}
+
+impl BaseAudioContext {
+    #[allow(unrooted_must_root)]
+    #[allow(unsafe_code)]
+    pub fn new_inherited(
+        global: &GlobalScope,
+        channel_count: u32,
+        sample_rate: f32,
+    ) -> BaseAudioContext {
+        let mut context = BaseAudioContext {
+            reflector_: Reflector::new(),
+            destination: None,
+            current_time: 0.,
+            sample_rate,
+            state: AudioContextState::Suspended,
+        };
+
+        let mut options = unsafe { AudioNodeOptions::empty(global.get_cx()) };
+        options.channelCount = Some(channel_count);
+        options.channelCountMode = Some(ChannelCountMode::Explicit);
+        options.channelInterpretation = Some(ChannelInterpretation::Speakers);
+
+        context.destination = Some(AudioDestinationNode::new(global, &context, &options));
+
+        context
+    }
+}
+
+impl BaseAudioContextMethods for BaseAudioContext {
+    // https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-samplerate
+    fn SampleRate(&self) -> Finite<f32> {
+        Finite::wrap(self.sample_rate)
+    }
+
+    // https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-currenttime
+    fn CurrentTime(&self) -> Finite<f64> {
+        Finite::wrap(self.current_time)
+    }
+
+    // https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-resume
+    #[allow(unrooted_must_root)]
+    fn Resume(&self) -> Rc<Promise> {
+        // TODO
+        Promise::new(&self.global())
+    }
+
+    // https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-destination
+    fn Destination(&self) -> DomRoot<AudioDestinationNode> {
+        DomRoot::from_ref(self.destination.as_ref().unwrap())
+    }
+
+    // https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-onstatechange
+    event_handler!(statechange, GetOnstatechange, SetOnstatechange);
+}