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 dom_struct::dom_struct;
12use js::context::JSContext;
13use js::realm::CurrentRealm;
14use js::rust::CustomAutoRooterGuard;
15use js::typedarray::ArrayBuffer;
16use script_bindings::cell::DomRefCell;
17use script_bindings::cformat;
18use servo_base::id::PipelineId;
19use servo_media::audio::context::{
20    AudioContext, AudioContextOptions, OfflineAudioContextOptions, ProcessingState,
21    RealTimeAudioContextOptions,
22};
23use servo_media::audio::decoder::AudioDecoderCallbacksBuilder;
24use servo_media::audio::graph::NodeId;
25use servo_media::{ClientContextId, ServoMedia};
26use uuid::Uuid;
27
28use crate::conversions::Convert;
29use crate::dom::audio::analysernode::AnalyserNode;
30use crate::dom::audio::audiobuffer::AudioBuffer;
31use crate::dom::audio::audiobuffersourcenode::AudioBufferSourceNode;
32use crate::dom::audio::audiodestinationnode::AudioDestinationNode;
33use crate::dom::audio::audiolistener::AudioListener;
34use crate::dom::audio::audionode::MAX_CHANNEL_COUNT;
35use crate::dom::audio::biquadfilternode::BiquadFilterNode;
36use crate::dom::audio::channelmergernode::ChannelMergerNode;
37use crate::dom::audio::channelsplitternode::ChannelSplitterNode;
38use crate::dom::audio::constantsourcenode::ConstantSourceNode;
39use crate::dom::audio::gainnode::GainNode;
40use crate::dom::audio::iirfilternode::IIRFilterNode;
41use crate::dom::audio::oscillatornode::OscillatorNode;
42use crate::dom::audio::pannernode::PannerNode;
43use crate::dom::audio::stereopannernode::StereoPannerNode;
44use crate::dom::bindings::callback::ExceptionHandling;
45use crate::dom::bindings::codegen::Bindings::AnalyserNodeBinding::AnalyserOptions;
46use crate::dom::bindings::codegen::Bindings::AudioBufferSourceNodeBinding::AudioBufferSourceOptions;
47use crate::dom::bindings::codegen::Bindings::AudioNodeBinding::{
48    AudioNodeOptions, ChannelCountMode, ChannelInterpretation,
49};
50use crate::dom::bindings::codegen::Bindings::BaseAudioContextBinding::{
51    AudioContextState, BaseAudioContextMethods, DecodeErrorCallback, DecodeSuccessCallback,
52};
53use crate::dom::bindings::codegen::Bindings::BiquadFilterNodeBinding::BiquadFilterOptions;
54use crate::dom::bindings::codegen::Bindings::ChannelMergerNodeBinding::ChannelMergerOptions;
55use crate::dom::bindings::codegen::Bindings::ChannelSplitterNodeBinding::ChannelSplitterOptions;
56use crate::dom::bindings::codegen::Bindings::ConstantSourceNodeBinding::ConstantSourceOptions;
57use crate::dom::bindings::codegen::Bindings::GainNodeBinding::GainOptions;
58use crate::dom::bindings::codegen::Bindings::IIRFilterNodeBinding::IIRFilterOptions;
59use crate::dom::bindings::codegen::Bindings::OscillatorNodeBinding::OscillatorOptions;
60use crate::dom::bindings::codegen::Bindings::PannerNodeBinding::PannerOptions;
61use crate::dom::bindings::codegen::Bindings::StereoPannerNodeBinding::StereoPannerOptions;
62use crate::dom::bindings::error::{Error, ErrorResult, Fallible};
63use crate::dom::bindings::inheritance::Castable;
64use crate::dom::bindings::num::Finite;
65use crate::dom::bindings::refcounted::Trusted;
66use crate::dom::bindings::reflector::DomGlobal;
67use crate::dom::bindings::root::{DomRoot, MutNullableDom};
68use crate::dom::domexception::{DOMErrorName, DOMException};
69use crate::dom::eventtarget::EventTarget;
70use crate::dom::promise::Promise;
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, cx: &mut JSContext, 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(cx, value),
215                Err(ref error) => promise.reject_error(cx, error.clone()),
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 |cx| {
239                        let this = this.root();
240                        this.fulfill_in_flight_resume_promises(cx, || {
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 |cx| {
260                        this.root().fulfill_in_flight_resume_promises(cx, || {})
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, cx: &mut CurrentRealm) -> Rc<Promise> {
290        // Step 1.
291        let promise = Promise::new_in_realm(cx);
292
293        // Step 2.
294        if self.audio_context_impl.lock().unwrap().state() == ProcessingState::Closed {
295            promise.reject_error(cx, Error::InvalidState(None));
296            return promise;
297        }
298
299        // Step 3.
300        if self.state.get() == AudioContextState::Running {
301            promise.resolve_native(cx, &());
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, cx: &mut JSContext) -> 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(cx, &global, self, &options)
328        })
329    }
330
331    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-listener>
332    fn Listener(&self, cx: &mut JSContext) -> DomRoot<AudioListener> {
333        let global = self.global();
334        let window = global.as_window();
335        self.listener
336            .or_init(|| AudioListener::new(cx, window, self))
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, cx: &mut JSContext) -> Fallible<DomRoot<OscillatorNode>> {
344        OscillatorNode::new(
345            cx,
346            self.global().as_window(),
347            self,
348            &OscillatorOptions::empty(),
349        )
350    }
351
352    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-creategain>
353    fn CreateGain(&self, cx: &mut JSContext) -> Fallible<DomRoot<GainNode>> {
354        GainNode::new(cx, self.global().as_window(), self, &GainOptions::empty())
355    }
356
357    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createpanner>
358    fn CreatePanner(&self, cx: &mut JSContext) -> Fallible<DomRoot<PannerNode>> {
359        PannerNode::new(cx, self.global().as_window(), self, &PannerOptions::empty())
360    }
361
362    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createanalyser>
363    fn CreateAnalyser(&self, cx: &mut JSContext) -> Fallible<DomRoot<AnalyserNode>> {
364        AnalyserNode::new(
365            cx,
366            self.global().as_window(),
367            self,
368            &AnalyserOptions::empty(),
369        )
370    }
371
372    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createbiquadfilter>
373    fn CreateBiquadFilter(&self, cx: &mut JSContext) -> Fallible<DomRoot<BiquadFilterNode>> {
374        BiquadFilterNode::new(
375            cx,
376            self.global().as_window(),
377            self,
378            &BiquadFilterOptions::empty(),
379        )
380    }
381
382    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createstereopanner>
383    fn CreateStereoPanner(&self, cx: &mut JSContext) -> Fallible<DomRoot<StereoPannerNode>> {
384        StereoPannerNode::new(
385            cx,
386            self.global().as_window(),
387            self,
388            &StereoPannerOptions::empty(),
389        )
390    }
391
392    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createconstantsource>
393    fn CreateConstantSource(&self, cx: &mut JSContext) -> Fallible<DomRoot<ConstantSourceNode>> {
394        ConstantSourceNode::new(
395            cx,
396            self.global().as_window(),
397            self,
398            &ConstantSourceOptions::empty(),
399        )
400    }
401
402    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createchannelmerger>
403    fn CreateChannelMerger(
404        &self,
405        cx: &mut JSContext,
406        count: u32,
407    ) -> Fallible<DomRoot<ChannelMergerNode>> {
408        let mut opts = ChannelMergerOptions::empty();
409        opts.numberOfInputs = count;
410        ChannelMergerNode::new(cx, self.global().as_window(), self, &opts)
411    }
412
413    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createchannelsplitter>
414    fn CreateChannelSplitter(
415        &self,
416        cx: &mut JSContext,
417        count: u32,
418    ) -> Fallible<DomRoot<ChannelSplitterNode>> {
419        let mut opts = ChannelSplitterOptions::empty();
420        opts.numberOfOutputs = count;
421        ChannelSplitterNode::new(cx, self.global().as_window(), self, &opts)
422    }
423
424    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createbuffer>
425    fn CreateBuffer(
426        &self,
427        cx: &mut JSContext,
428        number_of_channels: u32,
429        length: u32,
430        sample_rate: Finite<f32>,
431    ) -> Fallible<DomRoot<AudioBuffer>> {
432        if number_of_channels == 0 ||
433            number_of_channels > MAX_CHANNEL_COUNT ||
434            length == 0 ||
435            *sample_rate <= 0.
436        {
437            return Err(Error::NotSupported(None));
438        }
439        Ok(AudioBuffer::new(
440            cx,
441            self.global().as_window(),
442            number_of_channels,
443            length,
444            *sample_rate,
445            None,
446        ))
447    }
448
449    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createbuffersource>
450    fn CreateBufferSource(&self, cx: &mut JSContext) -> Fallible<DomRoot<AudioBufferSourceNode>> {
451        AudioBufferSourceNode::new(
452            cx,
453            self.global().as_window(),
454            self,
455            &AudioBufferSourceOptions::empty(),
456        )
457    }
458
459    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-decodeaudiodata>
460    fn DecodeAudioData(
461        &self,
462        cx: &mut CurrentRealm,
463        audio_data: CustomAutoRooterGuard<ArrayBuffer>,
464        decode_success_callback: Option<Rc<DecodeSuccessCallback>>,
465        decode_error_callback: Option<Rc<DecodeErrorCallback>>,
466    ) -> Rc<Promise> {
467        // Step 1.
468        let promise = Promise::new_in_realm(cx);
469
470        if audio_data.len() > 0 {
471            // Step 2.
472            // XXX detach array buffer.
473            let uuid = Uuid::new_v4().simple().to_string();
474            let uuid_ = uuid.clone();
475            self.decode_resolvers.borrow_mut().insert(
476                uuid.clone(),
477                DecodeResolver {
478                    promise: promise.clone(),
479                    success_callback: decode_success_callback,
480                    error_callback: decode_error_callback,
481                },
482            );
483            let audio_data = audio_data.to_vec();
484            let decoded_audio = Arc::new(Mutex::new(Vec::new()));
485            let decoded_audio_ = decoded_audio.clone();
486            let decoded_audio__ = decoded_audio.clone();
487            // servo-media returns an audio channel position along
488            // with the AudioDecoderCallback progress callback, which
489            // may not be the same as the index of the decoded_audio
490            // Vec.
491            let channels = Arc::new(Mutex::new(HashMap::new()));
492            let this = Trusted::new(self);
493            let this_ = this.clone();
494            let task_source = self
495                .global()
496                .task_manager()
497                .dom_manipulation_task_source()
498                .to_sendable();
499            let task_source_clone = task_source.clone();
500            let callbacks = AudioDecoderCallbacksBuilder::default()
501                .ready(move |channel_count| {
502                    decoded_audio
503                        .lock()
504                        .unwrap()
505                        .resize(channel_count as usize, Vec::new());
506                })
507                .progress(move |buffer, channel_pos_mask| {
508                    let mut decoded_audio = decoded_audio_.lock().unwrap();
509                    let mut channels = channels.lock().unwrap();
510                    let channel = match channels.entry(channel_pos_mask) {
511                        Entry::Occupied(entry) => *entry.get(),
512                        Entry::Vacant(entry) => {
513                            let x = (channel_pos_mask as f32).log2() as usize;
514                            *entry.insert(x)
515                        },
516                    };
517                    decoded_audio[channel].extend_from_slice((*buffer).as_ref());
518                })
519                .eos(move || {
520                    task_source.queue(task!(audio_decode_eos: move |cx| {
521                        let this = this.root();
522                        let decoded_audio = decoded_audio__.lock().unwrap();
523                        let length = if !decoded_audio.is_empty() {
524                            decoded_audio[0].len()
525                        } else {
526                            0
527                        };
528                        let buffer = AudioBuffer::new(
529                            cx,
530                            this.global().as_window(),
531                            decoded_audio.len() as u32 /* number of channels */,
532                            length as u32,
533                            this.sample_rate,
534                            Some(decoded_audio.as_slice()),
535                        );
536                        let mut resolvers = this.decode_resolvers.borrow_mut();
537                        assert!(resolvers.contains_key(&uuid_));
538                        let resolver = resolvers.remove(&uuid_).unwrap();
539                        if let Some(callback) = resolver.success_callback {
540                            let _ = callback.Call__(cx, &buffer, ExceptionHandling::Report);
541                        }
542                        resolver.promise.resolve_native(cx, &buffer);
543                    }));
544                })
545                .error(move |error| {
546                    task_source_clone.queue(task!(audio_decode_eos: move |cx| {
547                        let this = this_.root();
548                        let mut resolvers = this.decode_resolvers.borrow_mut();
549                        assert!(resolvers.contains_key(&uuid));
550                        let resolver = resolvers.remove(&uuid).unwrap();
551                        if let Some(callback) = resolver.error_callback {
552                            let exception = DOMException::new(cx,
553                                &this.global(),
554                                DOMErrorName::DataCloneError,
555                            );
556                            let _ = callback.Call__(cx, &exception, ExceptionHandling::Report);
557                        }
558                        let error = cformat!("Audio decode error {:?}", error);
559                        resolver.promise.reject_error(cx, Error::Type(error));
560                    }));
561                })
562                .build();
563            self.audio_context_impl
564                .lock()
565                .unwrap()
566                .decode_audio_data(audio_data, callbacks);
567        } else {
568            // Step 3.
569            promise.reject_error(cx, Error::DataClone(None));
570            return promise;
571        }
572
573        // Step 4.
574        promise
575    }
576
577    /// <https://webaudio.github.io/web-audio-api/#dom-baseaudiocontext-createiirfilter>
578    fn CreateIIRFilter(
579        &self,
580        cx: &mut JSContext,
581        feedforward: Vec<Finite<f64>>,
582        feedback: Vec<Finite<f64>>,
583    ) -> Fallible<DomRoot<IIRFilterNode>> {
584        let opts = IIRFilterOptions {
585            parent: AudioNodeOptions::empty(),
586            feedback,
587            feedforward,
588        };
589        IIRFilterNode::new(cx, self.global().as_window(), self, &opts)
590    }
591}
592
593impl Convert<AudioContextOptions> for BaseAudioContextOptions {
594    fn convert(self) -> AudioContextOptions {
595        match self {
596            BaseAudioContextOptions::AudioContext(options) => {
597                AudioContextOptions::RealTimeAudioContext(options)
598            },
599            BaseAudioContextOptions::OfflineAudioContext(options) => {
600                AudioContextOptions::OfflineAudioContext(options)
601            },
602        }
603    }
604}
605
606impl Convert<AudioContextState> for ProcessingState {
607    fn convert(self) -> AudioContextState {
608        match self {
609            ProcessingState::Suspended => AudioContextState::Suspended,
610            ProcessingState::Running => AudioContextState::Running,
611            ProcessingState::Closed => AudioContextState::Closed,
612        }
613    }
614}
script/dom/audio/baseaudiocontext.rs

script/dom/audio/
baseaudiocontext.rs
