1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152

/* 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::sync::Arc;

use dom_struct::dom_struct;
use itertools::Itertools;
use js::gc::CustomAutoRooterGuard;
use js::rust::HandleObject;
use js::typedarray::Float32Array;
use servo_media::audio::iir_filter_node::{IIRFilterNode as IIRFilter, IIRFilterNodeOptions};
use servo_media::audio::node::AudioNodeInit;

use crate::dom::audionode::AudioNode;
use crate::dom::baseaudiocontext::BaseAudioContext;
use crate::dom::bindings::codegen::Bindings::AudioNodeBinding::{
    ChannelCountMode, ChannelInterpretation,
};
use crate::dom::bindings::codegen::Bindings::IIRFilterNodeBinding::{
    IIRFilterNodeMethods, IIRFilterOptions,
};
use crate::dom::bindings::error::{Error, Fallible};
use crate::dom::bindings::num::Finite;
use crate::dom::bindings::reflector::reflect_dom_object_with_proto;
use crate::dom::bindings::root::DomRoot;
use crate::dom::window::Window;
use crate::script_runtime::CanGc;

#[dom_struct]
pub struct IIRFilterNode {
    node: AudioNode,
    feedforward: Vec<Finite<f64>>,
    feedback: Vec<Finite<f64>>,
}

impl IIRFilterNode {
    #[allow(crown::unrooted_must_root)]
    pub fn new_inherited(
        _window: &Window,
        context: &BaseAudioContext,
        options: &IIRFilterOptions,
    ) -> Fallible<IIRFilterNode> {
        if !(1..=20).contains(&options.feedforward.len()) ||
            !(1..=20).contains(&options.feedback.len())
        {
            return Err(Error::NotSupported);
        }
        if options.feedforward.iter().all(|v| **v == 0.0) || *options.feedback[0] == 0.0 {
            return Err(Error::InvalidState);
        }
        let node_options =
            options
                .parent
                .unwrap_or(2, ChannelCountMode::Max, ChannelInterpretation::Speakers);
        let init_options = options.into();
        let node = AudioNode::new_inherited(
            AudioNodeInit::IIRFilterNode(init_options),
            context,
            node_options,
            1, // inputs
            1, // outputs
        )?;
        Ok(IIRFilterNode {
            node,
            feedforward: (*options.feedforward).to_vec(),
            feedback: (*options.feedback).to_vec(),
        })
    }

    pub fn new(
        window: &Window,
        context: &BaseAudioContext,
        options: &IIRFilterOptions,
        can_gc: CanGc,
    ) -> Fallible<DomRoot<IIRFilterNode>> {
        Self::new_with_proto(window, None, context, options, can_gc)
    }

    #[allow(crown::unrooted_must_root)]
    fn new_with_proto(
        window: &Window,
        proto: Option<HandleObject>,
        context: &BaseAudioContext,
        options: &IIRFilterOptions,
        can_gc: CanGc,
    ) -> Fallible<DomRoot<IIRFilterNode>> {
        let node = IIRFilterNode::new_inherited(window, context, options)?;
        Ok(reflect_dom_object_with_proto(
            Box::new(node),
            window,
            proto,
            can_gc,
        ))
    }
}

impl IIRFilterNodeMethods<crate::DomTypeHolder> for IIRFilterNode {
    /// <https://webaudio.github.io/web-audio-api/#dom-iirfilternode-iirfilternode>
    fn Constructor(
        window: &Window,
        proto: Option<HandleObject>,
        can_gc: CanGc,
        context: &BaseAudioContext,
        options: &IIRFilterOptions,
    ) -> Fallible<DomRoot<IIRFilterNode>> {
        IIRFilterNode::new_with_proto(window, proto, context, options, can_gc)
    }

    #[allow(unsafe_code)]
    /// <https://webaudio.github.io/web-audio-api/#dom-iirfilternode-getfrequencyresponse>
    fn GetFrequencyResponse(
        &self,
        frequency_hz: CustomAutoRooterGuard<Float32Array>,
        mut mag_response: CustomAutoRooterGuard<Float32Array>,
        mut phase_response: CustomAutoRooterGuard<Float32Array>,
    ) -> Result<(), Error> {
        let len = frequency_hz.len();
        if len != mag_response.len() || len != phase_response.len() {
            return Err(Error::InvalidAccess);
        }
        let feedforward: Vec<f64> = (self.feedforward.iter().map(|v| **v).collect_vec()).to_vec();
        let feedback: Vec<f64> = (self.feedback.iter().map(|v| **v).collect_vec()).to_vec();
        let frequency_hz_vec = frequency_hz.to_vec();
        let mut mag_response_vec = mag_response.to_vec();
        let mut phase_response_vec = phase_response.to_vec();
        IIRFilter::get_frequency_response(
            &feedforward,
            &feedback,
            &frequency_hz_vec,
            &mut mag_response_vec,
            &mut phase_response_vec,
        );

        mag_response.update(&mag_response_vec);
        phase_response.update(&phase_response_vec);

        Ok(())
    }
}

impl<'a> From<&'a IIRFilterOptions> for IIRFilterNodeOptions {
    fn from(options: &'a IIRFilterOptions) -> Self {
        let feedforward: Vec<f64> =
            (*options.feedforward.iter().map(|v| **v).collect_vec()).to_vec();
        let feedback: Vec<f64> = (*options.feedback.iter().map(|v| **v).collect_vec()).to_vec();
        Self {
            feedforward: Arc::new(feedforward),
            feedback: Arc::new(feedback),
        }
    }
}