script/dom/audio/
baseaudiocontext.rs

1/* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
4
5use std::cell::Cell;
6use std::collections::hash_map::Entry;
7use std::collections::{HashMap, VecDeque};
8use std::rc::Rc;
9use std::sync::{Arc, Mutex};
10
11use base::id::PipelineId;
12use dom_struct::dom_struct;
13use js::rust::CustomAutoRooterGuard;
14use js::typedarray::ArrayBuffer;
15use script_bindings::cformat;
16use servo_media::audio::context::{
17    AudioContext, AudioContextOptions, OfflineAudioContextOptions, ProcessingState,
18    RealTimeAudioContextOptions,
19};
20use servo_media::audio::decoder::AudioDecoderCallbacksBuilder;
21use servo_media::audio::graph::NodeId;
22use servo_media::{ClientContextId, ServoMedia};
23use uuid::Uuid;
24
25use crate::conversions::Convert;
26use crate::dom::audio::analysernode::AnalyserNode;
27use crate::dom::audio::audiobuffer::AudioBuffer;
28use crate::dom::audio::audiobuffersourcenode::AudioBufferSourceNode;
29use crate::dom::audio::audiodestinationnode::AudioDestinationNode;
30use crate::dom::audio::audiolistener::AudioListener;
31use crate::dom::audio::audionode::MAX_CHANNEL_COUNT;
32use crate::dom::audio::biquadfilternode::BiquadFilterNode;
33use crate::dom::audio::channelmergernode::ChannelMergerNode;
34use crate::dom::audio::channelsplitternode::ChannelSplitterNode;
35use crate::dom::audio::constantsourcenode::ConstantSourceNode;
36use crate::dom::audio::gainnode::GainNode;
37use crate::dom::audio::iirfilternode::IIRFilterNode;
38use crate::dom::audio::oscillatornode::OscillatorNode;
39use crate::dom::audio::pannernode::PannerNode;
40use crate::dom::audio::stereopannernode::StereoPannerNode;
41use crate::dom::bindings::callback::ExceptionHandling;
42use crate::dom::bindings::cell::DomRefCell;
43use crate::dom::bindings::codegen::Bindings::AnalyserNodeBinding::AnalyserOptions;
44use crate::dom::bindings::codegen::Bindings::AudioBufferSourceNodeBinding::AudioBufferSourceOptions;
45use crate::dom::bindings::codegen::Bindings::AudioNodeBinding::{
46    AudioNodeOptions, ChannelCountMode, ChannelInterpretation,
47};
48use crate::dom::bindings::codegen::Bindings::BaseAudioContextBinding::{
49    AudioContextState, BaseAudioContextMethods, DecodeErrorCallback, DecodeSuccessCallback,
50};
51use crate::dom::bindings::codegen::Bindings::BiquadFilterNodeBinding::BiquadFilterOptions;
52use crate::dom::bindings::codegen::Bindings::ChannelMergerNodeBinding::ChannelMergerOptions;
53use crate::dom::bindings::codegen::Bindings::ChannelSplitterNodeBinding::ChannelSplitterOptions;
54use crate::dom::bindings::codegen::Bindings::ConstantSourceNodeBinding::ConstantSourceOptions;
55use crate::dom::bindings::codegen::Bindings::GainNodeBinding::GainOptions;
56use crate::dom::bindings::codegen::Bindings::IIRFilterNodeBinding::IIRFilterOptions;
57use crate::dom::bindings::codegen::Bindings::OscillatorNodeBinding::OscillatorOptions;
58use crate::dom::bindings::codegen::Bindings::PannerNodeBinding::PannerOptions;
59use crate::dom::bindings::codegen::Bindings::StereoPannerNodeBinding::StereoPannerOptions;
60use crate::dom::bindings::error::{Error, ErrorResult, Fallible};
61use crate::dom::bindings::inheritance::Castable;
62use crate::dom::bindings::num::Finite;
63use crate::dom::bindings::refcounted::Trusted;
64use crate::dom::bindings::reflector::DomGlobal;
65use crate::dom::bindings::root::{DomRoot, MutNullableDom};
66use crate::dom::domexception::{DOMErrorName, DOMException};
67use crate::dom::eventtarget::EventTarget;
68use crate::dom::promise::Promise;
69use crate::realms::InRealm;
70use crate::script_runtime::CanGc;
71
72pub(crate) enum BaseAudioContextOptions {
73    AudioContext(RealTimeAudioContextOptions),
74    OfflineAudioContext(OfflineAudioContextOptions),
75}
76
77#[derive(JSTraceable, MallocSizeOf)]
78struct DecodeResolver {
79    #[conditional_malloc_size_of]
80    pub(crate) promise: Rc<Promise>,
81    #[conditional_malloc_size_of]
82    pub(crate) success_callback: Option<Rc<DecodeSuccessCallback>>,
83    #[conditional_malloc_size_of]
84    pub(crate) error_callback: Option<Rc<DecodeErrorCallback>>,
85}
86
87type BoxedSliceOfPromises = Box<[Rc<Promise>]>;
88
89#[dom_struct]
90pub(crate) struct BaseAudioContext {
91    eventtarget: EventTarget,
92    #[ignore_malloc_size_of = "servo_media"]
93    #[no_trace]
94    audio_context_impl: Arc<Mutex<AudioContext>>,
95    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-destination>
96    destination: MutNullableDom<AudioDestinationNode>,
97    listener: MutNullableDom<AudioListener>,
98    /// Resume promises which are soon to be fulfilled by a queued task.
99    #[conditional_malloc_size_of]
100    in_flight_resume_promises_queue: DomRefCell<VecDeque<(BoxedSliceOfPromises, ErrorResult)>>,
101    /// <https://webaudio.github.io/web-audio-api/#pendingresumepromises>
102    #[conditional_malloc_size_of]
103    pending_resume_promises: DomRefCell<Vec<Rc<Promise>>>,
104    decode_resolvers: DomRefCell<HashMap<String, DecodeResolver>>,
105    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-samplerate>
106    sample_rate: f32,
107    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-state>
108    /// Although servo-media already keeps track of the control thread state,
109    /// we keep a state flag here as well. This is so that we can synchronously
110    /// throw when trying to do things on the context when the context has just
111    /// been "closed()".
112    state: Cell<AudioContextState>,
113    channel_count: u32,
114}
115
116impl BaseAudioContext {
117    pub(crate) fn new_inherited(
118        options: BaseAudioContextOptions,
119        pipeline_id: PipelineId,
120    ) -> Fallible<BaseAudioContext> {
121        let (sample_rate, channel_count) = match options {
122            BaseAudioContextOptions::AudioContext(ref opt) => (opt.sample_rate, 2),
123            BaseAudioContextOptions::OfflineAudioContext(ref opt) => {
124                (opt.sample_rate, opt.channels)
125            },
126        };
127
128        let client_context_id =
129            ClientContextId::build(pipeline_id.namespace_id.0, pipeline_id.index.0.get());
130        let audio_context_impl = ServoMedia::get()
131            .create_audio_context(&client_context_id, options.convert())
132            .map_err(|_| Error::NotSupported(None))?;
133
134        Ok(BaseAudioContext {
135            eventtarget: EventTarget::new_inherited(),
136            audio_context_impl,
137            destination: Default::default(),
138            listener: Default::default(),
139            in_flight_resume_promises_queue: Default::default(),
140            pending_resume_promises: Default::default(),
141            decode_resolvers: Default::default(),
142            sample_rate,
143            state: Cell::new(AudioContextState::Suspended),
144            channel_count: channel_count.into(),
145        })
146    }
147
148    /// Tells whether this is an OfflineAudioContext or not.
149    pub(crate) fn is_offline(&self) -> bool {
150        false
151    }
152
153    pub(crate) fn audio_context_impl(&self) -> Arc<Mutex<AudioContext>> {
154        self.audio_context_impl.clone()
155    }
156
157    pub(crate) fn destination_node(&self) -> NodeId {
158        self.audio_context_impl.lock().unwrap().dest_node()
159    }
160
161    pub(crate) fn listener(&self) -> NodeId {
162        self.audio_context_impl.lock().unwrap().listener()
163    }
164
165    // https://webaudio.github.io/web-audio-api/#allowed-to-start
166    pub(crate) fn is_allowed_to_start(&self) -> bool {
167        self.state.get() == AudioContextState::Suspended
168    }
169
170    fn push_pending_resume_promise(&self, promise: &Rc<Promise>) {
171        self.pending_resume_promises
172            .borrow_mut()
173            .push(promise.clone());
174    }
175
176    /// Takes the pending resume promises.
177    ///
178    /// The result with which these promises will be fulfilled is passed here
179    /// and this method returns nothing because we actually just move the
180    /// current list of pending resume promises to the
181    /// `in_flight_resume_promises_queue` field.
182    ///
183    /// Each call to this method must be followed by a call to
184    /// `fulfill_in_flight_resume_promises`, to actually fulfill the promises
185    /// which were taken and moved to the in-flight queue.
186    fn take_pending_resume_promises(&self, result: ErrorResult) {
187        let pending_resume_promises =
188            std::mem::take(&mut *self.pending_resume_promises.borrow_mut());
189        self.in_flight_resume_promises_queue
190            .borrow_mut()
191            .push_back((pending_resume_promises.into(), result));
192    }
193
194    /// Fulfills the next in-flight resume promises queue after running a closure.
195    ///
196    /// See the comment on `take_pending_resume_promises` for why this method
197    /// does not take a list of promises to fulfill. Callers cannot just pop
198    /// the front list off of `in_flight_resume_promises_queue` and later fulfill
199    /// the promises because that would mean putting
200    /// `#[cfg_attr(crown, expect(crown::unrooted_must_root))]` on even more functions, potentially
201    /// hiding actual safety bugs.
202    fn fulfill_in_flight_resume_promises<F>(&self, f: F)
203    where
204        F: FnOnce(),
205    {
206        let (promises, result) = self
207            .in_flight_resume_promises_queue
208            .borrow_mut()
209            .pop_front()
210            .expect("there should be at least one list of in flight resume promises");
211        f();
212        for promise in &*promises {
213            match result {
214                Ok(ref value) => promise.resolve_native(value, CanGc::note()),
215                Err(ref error) => promise.reject_error(error.clone(), CanGc::note()),
216            }
217        }
218    }
219
220    /// Control thread processing state
221    pub(crate) fn control_thread_state(&self) -> ProcessingState {
222        self.audio_context_impl.lock().unwrap().state()
223    }
224
225    /// Set audio context state
226    pub(crate) fn set_state_attribute(&self, state: AudioContextState) {
227        self.state.set(state);
228    }
229
230    pub(crate) fn resume(&self) {
231        let this = Trusted::new(self);
232        // Set the rendering thread state to 'running' and start
233        // rendering the audio graph.
234        match self.audio_context_impl.lock().unwrap().resume() {
235            Some(()) => {
236                self.take_pending_resume_promises(Ok(()));
237                self.global().task_manager().dom_manipulation_task_source().queue(
238                    task!(resume_success: move || {
239                        let this = this.root();
240                        this.fulfill_in_flight_resume_promises(|| {
241                            if this.state.get() != AudioContextState::Running {
242                                this.state.set(AudioContextState::Running);
243                                this.global().task_manager().dom_manipulation_task_source().queue_simple_event(
244                                    this.upcast(),
245                                    atom!("statechange"),
246                                    );
247                            }
248                        });
249                    })
250                );
251            },
252            None => {
253                self.take_pending_resume_promises(Err(Error::Type(
254                    c"Something went wrong".to_owned(),
255                )));
256                self.global()
257                    .task_manager()
258                    .dom_manipulation_task_source()
259                    .queue(task!(resume_error: move || {
260                        this.root().fulfill_in_flight_resume_promises(|| {})
261                    }));
262            },
263        }
264    }
265
266    pub(crate) fn channel_count(&self) -> u32 {
267        self.channel_count
268    }
269}
270
271impl BaseAudioContextMethods<crate::DomTypeHolder> for BaseAudioContext {
272    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-samplerate>
273    fn SampleRate(&self) -> Finite<f32> {
274        Finite::wrap(self.sample_rate)
275    }
276
277    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-currenttime>
278    fn CurrentTime(&self) -> Finite<f64> {
279        let current_time = self.audio_context_impl.lock().unwrap().current_time();
280        Finite::wrap(current_time)
281    }
282
283    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-state>
284    fn State(&self) -> AudioContextState {
285        self.state.get()
286    }
287
288    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-resume>
289    fn Resume(&self, comp: InRealm, can_gc: CanGc) -> Rc<Promise> {
290        // Step 1.
291        let promise = Promise::new_in_current_realm(comp, can_gc);
292
293        // Step 2.
294        if self.audio_context_impl.lock().unwrap().state() == ProcessingState::Closed {
295            promise.reject_error(Error::InvalidState(None), can_gc);
296            return promise;
297        }
298
299        // Step 3.
300        if self.state.get() == AudioContextState::Running {
301            promise.resolve_native(&(), can_gc);
302            return promise;
303        }
304
305        self.push_pending_resume_promise(&promise);
306
307        // Step 4.
308        if !self.is_allowed_to_start() {
309            return promise;
310        }
311
312        // Steps 5 and 6.
313        self.resume();
314
315        // Step 7.
316        promise
317    }
318
319    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-destination>
320    fn Destination(&self, can_gc: CanGc) -> DomRoot<AudioDestinationNode> {
321        let global = self.global();
322        self.destination.or_init(|| {
323            let mut options = AudioNodeOptions::empty();
324            options.channelCount = Some(self.channel_count);
325            options.channelCountMode = Some(ChannelCountMode::Explicit);
326            options.channelInterpretation = Some(ChannelInterpretation::Speakers);
327            AudioDestinationNode::new(&global, self, &options, can_gc)
328        })
329    }
330
331    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-listener>
332    fn Listener(&self, can_gc: CanGc) -> DomRoot<AudioListener> {
333        let global = self.global();
334        let window = global.as_window();
335        self.listener
336            .or_init(|| AudioListener::new(window, self, can_gc))
337    }
338
339    // https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-onstatechange
340    event_handler!(statechange, GetOnstatechange, SetOnstatechange);
341
342    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createoscillator>
343    fn CreateOscillator(&self, can_gc: CanGc) -> Fallible<DomRoot<OscillatorNode>> {
344        OscillatorNode::new(
345            self.global().as_window(),
346            self,
347            &OscillatorOptions::empty(),
348            can_gc,
349        )
350    }
351
352    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-creategain>
353    fn CreateGain(&self, can_gc: CanGc) -> Fallible<DomRoot<GainNode>> {
354        GainNode::new(
355            self.global().as_window(),
356            self,
357            &GainOptions::empty(),
358            can_gc,
359        )
360    }
361
362    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createpanner>
363    fn CreatePanner(&self, can_gc: CanGc) -> Fallible<DomRoot<PannerNode>> {
364        PannerNode::new(
365            self.global().as_window(),
366            self,
367            &PannerOptions::empty(),
368            can_gc,
369        )
370    }
371
372    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createanalyser>
373    fn CreateAnalyser(&self, can_gc: CanGc) -> Fallible<DomRoot<AnalyserNode>> {
374        AnalyserNode::new(
375            self.global().as_window(),
376            self,
377            &AnalyserOptions::empty(),
378            can_gc,
379        )
380    }
381
382    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createbiquadfilter>
383    fn CreateBiquadFilter(&self, can_gc: CanGc) -> Fallible<DomRoot<BiquadFilterNode>> {
384        BiquadFilterNode::new(
385            self.global().as_window(),
386            self,
387            &BiquadFilterOptions::empty(),
388            can_gc,
389        )
390    }
391
392    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createstereopanner>
393    fn CreateStereoPanner(&self, can_gc: CanGc) -> Fallible<DomRoot<StereoPannerNode>> {
394        StereoPannerNode::new(
395            self.global().as_window(),
396            self,
397            &StereoPannerOptions::empty(),
398            can_gc,
399        )
400    }
401
402    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createconstantsource>
403    fn CreateConstantSource(&self, can_gc: CanGc) -> Fallible<DomRoot<ConstantSourceNode>> {
404        ConstantSourceNode::new(
405            self.global().as_window(),
406            self,
407            &ConstantSourceOptions::empty(),
408            can_gc,
409        )
410    }
411
412    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createchannelmerger>
413    fn CreateChannelMerger(
414        &self,
415        count: u32,
416        can_gc: CanGc,
417    ) -> Fallible<DomRoot<ChannelMergerNode>> {
418        let mut opts = ChannelMergerOptions::empty();
419        opts.numberOfInputs = count;
420        ChannelMergerNode::new(self.global().as_window(), self, &opts, can_gc)
421    }
422
423    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createchannelsplitter>
424    fn CreateChannelSplitter(
425        &self,
426        count: u32,
427        can_gc: CanGc,
428    ) -> Fallible<DomRoot<ChannelSplitterNode>> {
429        let mut opts = ChannelSplitterOptions::empty();
430        opts.numberOfOutputs = count;
431        ChannelSplitterNode::new(self.global().as_window(), self, &opts, can_gc)
432    }
433
434    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createbuffer>
435    fn CreateBuffer(
436        &self,
437        number_of_channels: u32,
438        length: u32,
439        sample_rate: Finite<f32>,
440        can_gc: CanGc,
441    ) -> Fallible<DomRoot<AudioBuffer>> {
442        if number_of_channels == 0 ||
443            number_of_channels > MAX_CHANNEL_COUNT ||
444            length == 0 ||
445            *sample_rate <= 0.
446        {
447            return Err(Error::NotSupported(None));
448        }
449        Ok(AudioBuffer::new(
450            self.global().as_window(),
451            number_of_channels,
452            length,
453            *sample_rate,
454            None,
455            can_gc,
456        ))
457    }
458
459    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createbuffersource>
460    fn CreateBufferSource(&self, can_gc: CanGc) -> Fallible<DomRoot<AudioBufferSourceNode>> {
461        AudioBufferSourceNode::new(
462            self.global().as_window(),
463            self,
464            &AudioBufferSourceOptions::empty(),
465            can_gc,
466        )
467    }
468
469    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-decodeaudiodata>
470    fn DecodeAudioData(
471        &self,
472        audio_data: CustomAutoRooterGuard<ArrayBuffer>,
473        decode_success_callback: Option<Rc<DecodeSuccessCallback>>,
474        decode_error_callback: Option<Rc<DecodeErrorCallback>>,
475        comp: InRealm,
476        can_gc: CanGc,
477    ) -> Rc<Promise> {
478        // Step 1.
479        let promise = Promise::new_in_current_realm(comp, can_gc);
480
481        if audio_data.len() > 0 {
482            // Step 2.
483            // XXX detach array buffer.
484            let uuid = Uuid::new_v4().simple().to_string();
485            let uuid_ = uuid.clone();
486            self.decode_resolvers.borrow_mut().insert(
487                uuid.clone(),
488                DecodeResolver {
489                    promise: promise.clone(),
490                    success_callback: decode_success_callback,
491                    error_callback: decode_error_callback,
492                },
493            );
494            let audio_data = audio_data.to_vec();
495            let decoded_audio = Arc::new(Mutex::new(Vec::new()));
496            let decoded_audio_ = decoded_audio.clone();
497            let decoded_audio__ = decoded_audio.clone();
498            // servo-media returns an audio channel position along
499            // with the AudioDecoderCallback progress callback, which
500            // may not be the same as the index of the decoded_audio
501            // Vec.
502            let channels = Arc::new(Mutex::new(HashMap::new()));
503            let this = Trusted::new(self);
504            let this_ = this.clone();
505            let task_source = self
506                .global()
507                .task_manager()
508                .dom_manipulation_task_source()
509                .to_sendable();
510            let task_source_clone = task_source.clone();
511            let callbacks = AudioDecoderCallbacksBuilder::default()
512                .ready(move |channel_count| {
513                    decoded_audio
514                        .lock()
515                        .unwrap()
516                        .resize(channel_count as usize, Vec::new());
517                })
518                .progress(move |buffer, channel_pos_mask| {
519                    let mut decoded_audio = decoded_audio_.lock().unwrap();
520                    let mut channels = channels.lock().unwrap();
521                    let channel = match channels.entry(channel_pos_mask) {
522                        Entry::Occupied(entry) => *entry.get(),
523                        Entry::Vacant(entry) => {
524                            let x = (channel_pos_mask as f32).log2() as usize;
525                            *entry.insert(x)
526                        },
527                    };
528                    decoded_audio[channel].extend_from_slice((*buffer).as_ref());
529                })
530                .eos(move || {
531                    task_source.queue(task!(audio_decode_eos: move || {
532                        let this = this.root();
533                        let decoded_audio = decoded_audio__.lock().unwrap();
534                        let length = if !decoded_audio.is_empty() {
535                            decoded_audio[0].len()
536                        } else {
537                            0
538                        };
539                        let buffer = AudioBuffer::new(
540                            this.global().as_window(),
541                            decoded_audio.len() as u32 /* number of channels */,
542                            length as u32,
543                            this.sample_rate,
544                            Some(decoded_audio.as_slice()),
545                            CanGc::note());
546                        let mut resolvers = this.decode_resolvers.borrow_mut();
547                        assert!(resolvers.contains_key(&uuid_));
548                        let resolver = resolvers.remove(&uuid_).unwrap();
549                        if let Some(callback) = resolver.success_callback {
550                            let _ = callback.Call__(&buffer, ExceptionHandling::Report, CanGc::note());
551                        }
552                        resolver.promise.resolve_native(&buffer, CanGc::note());
553                    }));
554                })
555                .error(move |error| {
556                    task_source_clone.queue(task!(audio_decode_eos: move || {
557                        let this = this_.root();
558                        let mut resolvers = this.decode_resolvers.borrow_mut();
559                        assert!(resolvers.contains_key(&uuid));
560                        let resolver = resolvers.remove(&uuid).unwrap();
561                        if let Some(callback) = resolver.error_callback {
562                            let _ = callback.Call__(
563                                &DOMException::new(&this.global(), DOMErrorName::DataCloneError, CanGc::note()),
564                                ExceptionHandling::Report, CanGc::note());
565                        }
566                        let error = cformat!("Audio decode error {:?}", error);
567                        resolver.promise.reject_error(Error::Type(error), CanGc::note());
568                    }));
569                })
570                .build();
571            self.audio_context_impl
572                .lock()
573                .unwrap()
574                .decode_audio_data(audio_data, callbacks);
575        } else {
576            // Step 3.
577            promise.reject_error(Error::DataClone(None), can_gc);
578            return promise;
579        }
580
581        // Step 4.
582        promise
583    }
584
585    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createiirfilter>
586    fn CreateIIRFilter(
587        &self,
588        feedforward: Vec<Finite<f64>>,
589        feedback: Vec<Finite<f64>>,
590        can_gc: CanGc,
591    ) -> Fallible<DomRoot<IIRFilterNode>> {
592        let opts = IIRFilterOptions {
593            parent: AudioNodeOptions::empty(),
594            feedback,
595            feedforward,
596        };
597        IIRFilterNode::new(self.global().as_window(), self, &opts, can_gc)
598    }
599}
600
601impl Convert<AudioContextOptions> for BaseAudioContextOptions {
602    fn convert(self) -> AudioContextOptions {
603        match self {
604            BaseAudioContextOptions::AudioContext(options) => {
605                AudioContextOptions::RealTimeAudioContext(options)
606            },
607            BaseAudioContextOptions::OfflineAudioContext(options) => {
608                AudioContextOptions::OfflineAudioContext(options)
609            },
610        }
611    }
612}
613
614impl Convert<AudioContextState> for ProcessingState {
615    fn convert(self) -> AudioContextState {
616        match self {
617            ProcessingState::Suspended => AudioContextState::Suspended,
618            ProcessingState::Running => AudioContextState::Running,
619            ProcessingState::Closed => AudioContextState::Closed,
620        }
621    }
622}
script/dom/audio/baseaudiocontext.rs

script/dom/audio/
baseaudiocontext.rs
