script/dom/
mediadevices.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::rc::Rc;
6
7use dom_struct::dom_struct;
8use servo_media::ServoMedia;
9use servo_media::streams::MediaStreamType;
10use servo_media::streams::capture::{Constrain, ConstrainRange, MediaTrackConstraintSet};
11
12use crate::conversions::Convert;
13use crate::dom::bindings::codegen::Bindings::MediaDevicesBinding::{
14    MediaDevicesMethods, MediaStreamConstraints,
15};
16use crate::dom::bindings::codegen::UnionTypes::{
17    BooleanOrMediaTrackConstraints, ClampedUnsignedLongOrConstrainULongRange as ConstrainULong,
18    DoubleOrConstrainDoubleRange as ConstrainDouble,
19};
20use crate::dom::bindings::reflector::{DomGlobal, reflect_dom_object};
21use crate::dom::bindings::root::DomRoot;
22use crate::dom::eventtarget::EventTarget;
23use crate::dom::globalscope::GlobalScope;
24use crate::dom::mediadeviceinfo::MediaDeviceInfo;
25use crate::dom::mediastream::MediaStream;
26use crate::dom::mediastreamtrack::MediaStreamTrack;
27use crate::dom::promise::Promise;
28use crate::realms::{AlreadyInRealm, InRealm};
29use crate::script_runtime::CanGc;
30
31#[dom_struct]
32pub(crate) struct MediaDevices {
33    eventtarget: EventTarget,
34}
35
36impl MediaDevices {
37    pub(crate) fn new_inherited() -> MediaDevices {
38        MediaDevices {
39            eventtarget: EventTarget::new_inherited(),
40        }
41    }
42
43    pub(crate) fn new(global: &GlobalScope, can_gc: CanGc) -> DomRoot<MediaDevices> {
44        reflect_dom_object(Box::new(MediaDevices::new_inherited()), global, can_gc)
45    }
46}
47
48impl MediaDevicesMethods<crate::DomTypeHolder> for MediaDevices {
49    /// <https://w3c.github.io/mediacapture-main/#dom-mediadevices-getusermedia>
50    #[allow(unsafe_code)]
51    fn GetUserMedia(
52        &self,
53        constraints: &MediaStreamConstraints,
54        comp: InRealm,
55        can_gc: CanGc,
56    ) -> Rc<Promise> {
57        let p = Promise::new_in_current_realm(comp, can_gc);
58        let media = ServoMedia::get();
59        let stream = MediaStream::new(&self.global(), can_gc);
60        if let Some(constraints) = convert_constraints(&constraints.audio) {
61            if let Some(audio) = media.create_audioinput_stream(constraints) {
62                let track =
63                    MediaStreamTrack::new(&self.global(), audio, MediaStreamType::Audio, can_gc);
64                stream.add_track(&track);
65            }
66        }
67        if let Some(constraints) = convert_constraints(&constraints.video) {
68            if let Some(video) = media.create_videoinput_stream(constraints) {
69                let track =
70                    MediaStreamTrack::new(&self.global(), video, MediaStreamType::Video, can_gc);
71                stream.add_track(&track);
72            }
73        }
74
75        p.resolve_native(&stream, can_gc);
76        p
77    }
78
79    /// <https://w3c.github.io/mediacapture-main/#dom-mediadevices-enumeratedevices>
80    fn EnumerateDevices(&self, can_gc: CanGc) -> Rc<Promise> {
81        // Step 1.
82        let in_realm_proof = AlreadyInRealm::assert::<crate::DomTypeHolder>();
83        let p = Promise::new_in_current_realm(InRealm::Already(&in_realm_proof), can_gc);
84
85        // Step 2.
86        // XXX These steps should be run in parallel.
87        // XXX Steps 2.1 - 2.4
88
89        // Step 2.5
90        let media = ServoMedia::get();
91        let device_monitor = media.get_device_monitor();
92        let result_list = match device_monitor.enumerate_devices() {
93            Ok(devices) => devices
94                .iter()
95                .map(|device| {
96                    // XXX The media backend has no way to group devices yet.
97                    MediaDeviceInfo::new(
98                        &self.global(),
99                        &device.device_id,
100                        device.kind.convert(),
101                        &device.label,
102                        "",
103                        can_gc,
104                    )
105                })
106                .collect(),
107            Err(_) => Vec::new(),
108        };
109
110        p.resolve_native(&result_list, can_gc);
111
112        // Step 3.
113        p
114    }
115}
116
117fn convert_constraints(js: &BooleanOrMediaTrackConstraints) -> Option<MediaTrackConstraintSet> {
118    match js {
119        BooleanOrMediaTrackConstraints::Boolean(false) => None,
120        BooleanOrMediaTrackConstraints::Boolean(true) => Some(Default::default()),
121        BooleanOrMediaTrackConstraints::MediaTrackConstraints(c) => Some(MediaTrackConstraintSet {
122            height: c.parent.height.as_ref().and_then(convert_culong),
123            width: c.parent.width.as_ref().and_then(convert_culong),
124            aspect: c.parent.aspectRatio.as_ref().and_then(convert_cdouble),
125            frame_rate: c.parent.frameRate.as_ref().and_then(convert_cdouble),
126            sample_rate: c.parent.sampleRate.as_ref().and_then(convert_culong),
127        }),
128    }
129}
130
131fn convert_culong(js: &ConstrainULong) -> Option<Constrain<u32>> {
132    match js {
133        ConstrainULong::ClampedUnsignedLong(val) => Some(Constrain::Value(*val)),
134        ConstrainULong::ConstrainULongRange(range) => {
135            if range.parent.min.is_some() || range.parent.max.is_some() {
136                Some(Constrain::Range(ConstrainRange {
137                    min: range.parent.min,
138                    max: range.parent.max,
139                    ideal: range.ideal,
140                }))
141            } else {
142                range.exact.map(Constrain::Value)
143            }
144        },
145    }
146}
147
148fn convert_cdouble(js: &ConstrainDouble) -> Option<Constrain<f64>> {
149    match js {
150        ConstrainDouble::Double(val) => Some(Constrain::Value(**val)),
151        ConstrainDouble::ConstrainDoubleRange(range) => {
152            if range.parent.min.is_some() || range.parent.max.is_some() {
153                Some(Constrain::Range(ConstrainRange {
154                    min: range.parent.min.map(|x| *x),
155                    max: range.parent.max.map(|x| *x),
156                    ideal: range.ideal.map(|x| *x),
157                }))
158            } else {
159                range.exact.map(|exact| Constrain::Value(*exact))
160            }
161        },
162    }
163}
script/dom/mediadevices.rs

script/dom/
mediadevices.rs
