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/* 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::audionode::AudioNode;
use crate::dom::audioparam::AudioParam;
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::GainNodeBinding::{
self, GainNodeMethods, GainOptions,
};
use crate::dom::bindings::error::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::gain_node::GainNodeOptions;
use servo_media::audio::node::AudioNodeInit;
use servo_media::audio::param::ParamType;
use std::f32;
#[dom_struct]
pub struct GainNode {
node: AudioNode,
gain: Dom<AudioParam>,
}
impl GainNode {
#[allow(unrooted_must_root)]
pub fn new_inherited(
window: &Window,
context: &BaseAudioContext,
options: &GainOptions,
) -> Fallible<GainNode> {
let node_options =
options
.parent
.unwrap_or(2, ChannelCountMode::Max, ChannelInterpretation::Speakers);
let node = AudioNode::new_inherited(
AudioNodeInit::GainNode(options.into()),
context,
node_options,
1, // inputs
1, // outputs
)?;
let gain = AudioParam::new(
window,
context,
node.node_id(),
ParamType::Gain,
AutomationRate::A_rate,
*options.gain, // default value
f32::MIN, // min value
f32::MAX, // max value
);
Ok(GainNode {
node,
gain: Dom::from_ref(&gain),
})
}
#[allow(unrooted_must_root)]
pub fn new(
window: &Window,
context: &BaseAudioContext,
options: &GainOptions,
) -> Fallible<DomRoot<GainNode>> {
let node = GainNode::new_inherited(window, context, options)?;
Ok(reflect_dom_object(
Box::new(node),
window,
GainNodeBinding::Wrap,
))
}
pub fn Constructor(
window: &Window,
context: &BaseAudioContext,
options: &GainOptions,
) -> Fallible<DomRoot<GainNode>> {
GainNode::new(window, context, options)
}
}
impl GainNodeMethods for GainNode {
// https://webaudio.github.io/web-audio-api/#dom-gainnode-gain
fn Gain(&self) -> DomRoot<AudioParam> {
DomRoot::from_ref(&self.gain)
}
}
impl<'a> From<&'a GainOptions> for GainNodeOptions {
fn from(options: &'a GainOptions) -> Self {
Self {
gain: *options.gain,
}
}
}
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