1 files changed, 156 insertions, 0 deletions
diff --git a/components/script/dom/oscillatornode.rs b/components/script/dom/oscillatornode.rs
new file mode 100644
index 00000000000..948603ca6e2
--- /dev/null
+++ b/components/script/dom/oscillatornode.rs
@@ -0,0 +1,156 @@
+/* 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::audioparam::AudioParam;
+use crate::dom::audioscheduledsourcenode::AudioScheduledSourceNode;
+use crate::dom::baseaudiocontext::BaseAudioContext;
+use crate::dom::bindings::codegen::Bindings::AudioNodeBinding::{
+    ChannelCountMode, ChannelInterpretation,
+};
+use crate::dom::bindings::codegen::Bindings::AudioParamBinding::AutomationRate;
+use crate::dom::bindings::codegen::Bindings::OscillatorNodeBinding::OscillatorNodeMethods;
+use crate::dom::bindings::codegen::Bindings::OscillatorNodeBinding::{
+    OscillatorOptions, OscillatorType,
+};
+use crate::dom::bindings::error::{Error, ErrorResult, Fallible};
+use crate::dom::bindings::reflector::reflect_dom_object;
+use crate::dom::bindings::root::{Dom, DomRoot};
+use crate::dom::window::Window;
+use dom_struct::dom_struct;
+use servo_media::audio::node::{AudioNodeInit, AudioNodeMessage};
+use servo_media::audio::oscillator_node::OscillatorNodeMessage;
+use servo_media::audio::oscillator_node::OscillatorNodeOptions as ServoMediaOscillatorOptions;
+use servo_media::audio::oscillator_node::OscillatorType as ServoMediaOscillatorType;
+use servo_media::audio::param::ParamType;
+use std::cell::Cell;
+use std::f32;
+
+#[dom_struct]
+pub struct OscillatorNode {
+    source_node: AudioScheduledSourceNode,
+    detune: Dom<AudioParam>,
+    frequency: Dom<AudioParam>,
+    oscillator_type: Cell<OscillatorType>,
+}
+
+impl OscillatorNode {
+    #[allow(unrooted_must_root)]
+    pub fn new_inherited(
+        window: &Window,
+        context: &BaseAudioContext,
+        options: &OscillatorOptions,
+    ) -> Fallible<OscillatorNode> {
+        let node_options =
+            options
+                .parent
+                .unwrap_or(2, ChannelCountMode::Max, ChannelInterpretation::Speakers);
+        let source_node = AudioScheduledSourceNode::new_inherited(
+            AudioNodeInit::OscillatorNode(options.into()),
+            context,
+            node_options,
+            0, /* inputs */
+            1, /* outputs */
+        )?;
+        let node_id = source_node.node().node_id();
+        let frequency = AudioParam::new(
+            window,
+            context,
+            node_id,
+            ParamType::Frequency,
+            AutomationRate::A_rate,
+            440.,
+            f32::MIN,
+            f32::MAX,
+        );
+        let detune = AudioParam::new(
+            window,
+            context,
+            node_id,
+            ParamType::Detune,
+            AutomationRate::A_rate,
+            0.,
+            -440. / 2.,
+            440. / 2.,
+        );
+        Ok(OscillatorNode {
+            source_node,
+            oscillator_type: Cell::new(options.type_),
+            frequency: Dom::from_ref(&frequency),
+            detune: Dom::from_ref(&detune),
+        })
+    }
+
+    #[allow(unrooted_must_root)]
+    pub fn new(
+        window: &Window,
+        context: &BaseAudioContext,
+        options: &OscillatorOptions,
+    ) -> Fallible<DomRoot<OscillatorNode>> {
+        let node = OscillatorNode::new_inherited(window, context, options)?;
+        Ok(reflect_dom_object(Box::new(node), window))
+    }
+
+    #[allow(non_snake_case)]
+    pub fn Constructor(
+        window: &Window,
+        context: &BaseAudioContext,
+        options: &OscillatorOptions,
+    ) -> Fallible<DomRoot<OscillatorNode>> {
+        OscillatorNode::new(window, context, options)
+    }
+}
+
+impl OscillatorNodeMethods for OscillatorNode {
+    // https://webaudio.github.io/web-audio-api/#dom-oscillatornode-frequency
+    fn Frequency(&self) -> DomRoot<AudioParam> {
+        DomRoot::from_ref(&self.frequency)
+    }
+
+    // https://webaudio.github.io/web-audio-api/#dom-oscillatornode-detune
+    fn Detune(&self) -> DomRoot<AudioParam> {
+        DomRoot::from_ref(&self.detune)
+    }
+
+    // https://webaudio.github.io/web-audio-api/#dom-oscillatornode-type
+    fn Type(&self) -> OscillatorType {
+        self.oscillator_type.get()
+    }
+
+    // https://webaudio.github.io/web-audio-api/#dom-oscillatornode-type
+    fn SetType(&self, type_: OscillatorType) -> ErrorResult {
+        if type_ == OscillatorType::Custom {
+            return Err(Error::InvalidState);
+        }
+        self.oscillator_type.set(type_);
+        self.source_node
+            .node()
+            .message(AudioNodeMessage::OscillatorNode(
+                OscillatorNodeMessage::SetOscillatorType(type_.into()),
+            ));
+        return Ok(());
+    }
+}
+
+impl<'a> From<&'a OscillatorOptions> for ServoMediaOscillatorOptions {
+    fn from(options: &'a OscillatorOptions) -> Self {
+        Self {
+            oscillator_type: options.type_.into(),
+            freq: *options.frequency,
+            detune: *options.detune,
+            periodic_wave_options: None, // XXX
+        }
+    }
+}
+
+impl From<OscillatorType> for ServoMediaOscillatorType {
+    fn from(oscillator_type: OscillatorType) -> Self {
+        match oscillator_type {
+            OscillatorType::Sine => ServoMediaOscillatorType::Sine,
+            OscillatorType::Square => ServoMediaOscillatorType::Square,
+            OscillatorType::Sawtooth => ServoMediaOscillatorType::Sawtooth,
+            OscillatorType::Triangle => ServoMediaOscillatorType::Triangle,
+            OscillatorType::Custom => ServoMediaOscillatorType::Custom,
+        }
+    }
+}