script: Move webaudio DOM interfaces to script/dom/audio/ (#38894)

Moves interfaces defined by the webaudio spec (27 files) to the new
`script/dom/audio/` module from the `script/dom/` module.

Testing: Just a refactor shouldn't need any testing
Fixes: N/A

Signed-off-by: Ashwin Naren <arihant2math@gmail.com>

components/script/dom/audio/audioscheduledsourcenode.rs

@@ -0,0 +1,118 @@
+/* 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 std::cell::Cell;
+
+use dom_struct::dom_struct;
+use servo_media::audio::node::{
+    AudioNodeInit, AudioNodeMessage, AudioScheduledSourceNodeMessage, OnEndedCallback,
+};
+
+use crate::dom::audio::audionode::{AudioNode, UnwrappedAudioNodeOptions};
+use crate::dom::audio::baseaudiocontext::BaseAudioContext;
+use crate::dom::bindings::codegen::Bindings::AudioScheduledSourceNodeBinding::AudioScheduledSourceNodeMethods;
+use crate::dom::bindings::error::{Error, Fallible};
+use crate::dom::bindings::inheritance::Castable;
+use crate::dom::bindings::num::Finite;
+use crate::dom::bindings::refcounted::Trusted;
+use crate::dom::bindings::reflector::DomGlobal;
+
+#[dom_struct]
+pub(crate) struct AudioScheduledSourceNode {
+    node: AudioNode,
+    has_start: Cell<bool>,
+    has_stop: Cell<bool>,
+}
+
+impl AudioScheduledSourceNode {
+    #[cfg_attr(crown, allow(crown::unrooted_must_root))]
+    pub(crate) fn new_inherited(
+        node_type: AudioNodeInit,
+        context: &BaseAudioContext,
+        options: UnwrappedAudioNodeOptions,
+        number_of_inputs: u32,
+        number_of_outputs: u32,
+    ) -> Fallible<AudioScheduledSourceNode> {
+        Ok(AudioScheduledSourceNode {
+            node: AudioNode::new_inherited(
+                node_type,
+                context,
+                options,
+                number_of_inputs,
+                number_of_outputs,
+            )?,
+            has_start: Cell::new(false),
+            has_stop: Cell::new(false),
+        })
+    }
+
+    pub(crate) fn node(&self) -> &AudioNode {
+        &self.node
+    }
+
+    pub(crate) fn has_start(&self) -> bool {
+        self.has_start.get()
+    }
+}
+
+impl AudioScheduledSourceNodeMethods<crate::DomTypeHolder> for AudioScheduledSourceNode {
+    // https://webaudio.github.io/web-audio-api/#dom-audioscheduledsourcenode-onended
+    event_handler!(ended, GetOnended, SetOnended);
+
+    // https://webaudio.github.io/web-audio-api/#dom-audioscheduledsourcenode-start
+    fn Start(&self, when: Finite<f64>) -> Fallible<()> {
+        if *when < 0. {
+            return Err(Error::Range("'when' must be a positive value".to_owned()));
+        }
+
+        if self.has_start.get() || self.has_stop.get() {
+            return Err(Error::InvalidState);
+        }
+
+        let this = Trusted::new(self);
+        let task_source = self
+            .global()
+            .task_manager()
+            .dom_manipulation_task_source()
+            .to_sendable();
+        let callback = OnEndedCallback::new(move || {
+            task_source.queue(task!(ended: move || {
+                let this = this.root();
+                this.global().task_manager().dom_manipulation_task_source().queue_simple_event(
+                    this.upcast(),
+                    atom!("ended"),
+                    );
+            }));
+        });
+
+        self.node()
+            .message(AudioNodeMessage::AudioScheduledSourceNode(
+                AudioScheduledSourceNodeMessage::RegisterOnEndedCallback(callback),
+            ));
+
+        self.has_start.set(true);
+        self.node
+            .message(AudioNodeMessage::AudioScheduledSourceNode(
+                AudioScheduledSourceNodeMessage::Start(*when),
+            ));
+        Ok(())
+    }
+
+    // https://webaudio.github.io/web-audio-api/#dom-audioscheduledsourcenode-stop
+    fn Stop(&self, when: Finite<f64>) -> Fallible<()> {
+        if *when < 0. {
+            return Err(Error::Range("'when' must be a positive value".to_owned()));
+        }
+
+        if !self.has_start.get() {
+            return Err(Error::InvalidState);
+        }
+        self.has_stop.set(true);
+        self.node
+            .message(AudioNodeMessage::AudioScheduledSourceNode(
+                AudioScheduledSourceNodeMessage::Stop(*when),
+            ));
+        Ok(())
+    }
+}