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/stereopannernode.rs

@@ -0,0 +1,130 @@
+/* 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 dom_struct::dom_struct;
+use js::rust::HandleObject;
+use servo_media::audio::node::{AudioNodeInit, AudioNodeType};
+use servo_media::audio::param::ParamType;
+use servo_media::audio::stereo_panner::StereoPannerOptions as ServoMediaStereoPannerOptions;
+
+use crate::conversions::Convert;
+use crate::dom::audio::audionode::AudioNodeOptionsHelper;
+use crate::dom::audio::audioparam::AudioParam;
+use crate::dom::audio::audioscheduledsourcenode::AudioScheduledSourceNode;
+use crate::dom::audio::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::StereoPannerNodeBinding::{
+    StereoPannerNodeMethods, StereoPannerOptions,
+};
+use crate::dom::bindings::error::{Error, Fallible};
+use crate::dom::bindings::reflector::reflect_dom_object_with_proto;
+use crate::dom::bindings::root::{Dom, DomRoot};
+use crate::dom::window::Window;
+use crate::script_runtime::CanGc;
+
+#[dom_struct]
+pub(crate) struct StereoPannerNode {
+    source_node: AudioScheduledSourceNode,
+    pan: Dom<AudioParam>,
+}
+
+impl StereoPannerNode {
+    #[cfg_attr(crown, allow(crown::unrooted_must_root))]
+    pub(crate) fn new_inherited(
+        window: &Window,
+        context: &BaseAudioContext,
+        options: &StereoPannerOptions,
+    ) -> Fallible<StereoPannerNode> {
+        let node_options = options.parent.unwrap_or(
+            2,
+            ChannelCountMode::Clamped_max,
+            ChannelInterpretation::Speakers,
+        );
+        if node_options.mode == ChannelCountMode::Max {
+            return Err(Error::NotSupported);
+        }
+        if node_options.count > 2 || node_options.count == 0 {
+            return Err(Error::NotSupported);
+        }
+        let pan = *options.pan;
+        let source_node = AudioScheduledSourceNode::new_inherited(
+            AudioNodeInit::StereoPannerNode(options.convert()),
+            context,
+            node_options,
+            1, /* inputs */
+            1, /* outputs */
+        )?;
+        let node_id = source_node.node().node_id();
+        let pan = AudioParam::new(
+            window,
+            context,
+            node_id,
+            AudioNodeType::StereoPannerNode,
+            ParamType::Pan,
+            AutomationRate::A_rate,
+            pan,
+            -1.,
+            1.,
+            CanGc::note(),
+        );
+
+        Ok(StereoPannerNode {
+            source_node,
+            pan: Dom::from_ref(&pan),
+        })
+    }
+
+    pub(crate) fn new(
+        window: &Window,
+        context: &BaseAudioContext,
+        options: &StereoPannerOptions,
+        can_gc: CanGc,
+    ) -> Fallible<DomRoot<StereoPannerNode>> {
+        Self::new_with_proto(window, None, context, options, can_gc)
+    }
+
+    #[cfg_attr(crown, allow(crown::unrooted_must_root))]
+    fn new_with_proto(
+        window: &Window,
+        proto: Option<HandleObject>,
+        context: &BaseAudioContext,
+        options: &StereoPannerOptions,
+        can_gc: CanGc,
+    ) -> Fallible<DomRoot<StereoPannerNode>> {
+        let node = StereoPannerNode::new_inherited(window, context, options)?;
+        Ok(reflect_dom_object_with_proto(
+            Box::new(node),
+            window,
+            proto,
+            can_gc,
+        ))
+    }
+}
+
+impl StereoPannerNodeMethods<crate::DomTypeHolder> for StereoPannerNode {
+    // https://webaudio.github.io/web-audio-api/#dom-stereopannernode-stereopannernode
+    fn Constructor(
+        window: &Window,
+        proto: Option<HandleObject>,
+        can_gc: CanGc,
+        context: &BaseAudioContext,
+        options: &StereoPannerOptions,
+    ) -> Fallible<DomRoot<StereoPannerNode>> {
+        StereoPannerNode::new_with_proto(window, proto, context, options, can_gc)
+    }
+
+    // https://webaudio.github.io/web-audio-api/#dom-stereopannernode-pan
+    fn Pan(&self) -> DomRoot<AudioParam> {
+        DomRoot::from_ref(&self.pan)
+    }
+}
+
+impl Convert<ServoMediaStereoPannerOptions> for StereoPannerOptions {
+    fn convert(self) -> ServoMediaStereoPannerOptions {
+        ServoMediaStereoPannerOptions { pan: *self.pan }
+    }
+}