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

script/dom/audio/
baseaudiocontext.rs
