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
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
//! Wrapper around [MediaStreamTrack][1].
//!
//! [1]: https://w3.org/TR/mediacapture-streams#mediastreamtrack
use std::{cell::RefCell, future::Future, rc::Rc};
use derive_more::AsRef;
use futures::future;
use crate::{
media::{
track::MediaStreamTrackState, FacingMode, MediaKind, MediaSourceKind,
},
platform::wasm::{get_property_by_name, utils::EventListener},
};
/// Wrapper around [MediaStreamTrack][1] received from a
/// [getUserMedia()][2]/[getDisplayMedia()][3] request.
///
/// [1]: https://w3.org/TR/mediacapture-streams#mediastreamtrack
/// [2]: https://w3.org/TR/mediacapture-streams#dom-mediadevices-getusermedia
/// [3]: https://w3.org/TR/screen-capture/#dom-mediadevices-getdisplaymedia
#[derive(AsRef, Debug)]
pub struct MediaStreamTrack {
/// Underlying [MediaStreamTrack][1].
///
/// [1]: https://w3.org/TR/mediacapture-streams#mediastreamtrack
#[as_ref(forward)]
sys_track: Rc<web_sys::MediaStreamTrack>,
/// Kind of the underlying [MediaStreamTrack][1].
///
/// [1]: https://w3.org/TR/mediacapture-streams#mediastreamtrack
kind: MediaKind,
/// Media source kind of this [MediaStreamTrack][1].
///
/// [1]: https://w3.org/TR/mediacapture-streams#mediastreamtrack
source_kind: Option<MediaSourceKind>,
/// Listener for an [ended][1] event.
///
/// [1]: https://tinyurl.com/w3-streams#event-mediastreamtrack-ended
on_ended: RefCell<
Option<EventListener<web_sys::MediaStreamTrack, web_sys::Event>>,
>,
}
impl MediaStreamTrack {
/// Creates a new [`MediaStreamTrack`].
#[must_use]
pub fn new<T>(sys_track: T, source_kind: Option<MediaSourceKind>) -> Self
where
web_sys::MediaStreamTrack: From<T>,
{
let sys_track = web_sys::MediaStreamTrack::from(sys_track);
let kind = match sys_track.kind().as_ref() {
"audio" => MediaKind::Audio,
"video" => MediaKind::Video,
_ => unreachable!(),
};
Self {
sys_track: Rc::new(sys_track),
source_kind,
kind,
on_ended: RefCell::new(None),
}
}
/// Returns [`id`] of the underlying [MediaStreamTrack][2].
///
/// [`id`]: https://w3.org/TR/mediacapture-streams#dom-mediastreamtrack-id
/// [2]: https://w3.org/TR/mediacapture-streams#mediastreamtrack
#[must_use]
pub fn id(&self) -> String {
self.sys_track.id()
}
/// Returns this [`MediaStreamTrack`]'s kind (audio/video).
#[must_use]
pub const fn kind(&self) -> MediaKind {
self.kind
}
/// Returns [MediaStreamTrackState][1] of the underlying
/// [MediaStreamTrack][2].
///
/// # Panics
///
/// If [`readyState`][3] property of underlying [MediaStreamTrack][2] is
/// neither `live` nor `ended`.
///
/// [1]: https://w3.org/TR/mediacapture-streams#dom-mediastreamtrackstate
/// [2]: https://w3.org/TR/mediacapture-streams#mediastreamtrack
/// [3]: https://tinyurl.com/w3-streams#dom-mediastreamtrack-readystate
#[allow(clippy::unused_async)] // for platform code uniformity
pub async fn ready_state(&self) -> MediaStreamTrackState {
let state = self.sys_track.ready_state();
match state {
web_sys::MediaStreamTrackState::Live => MediaStreamTrackState::Live,
web_sys::MediaStreamTrackState::Ended => {
MediaStreamTrackState::Ended
}
web_sys::MediaStreamTrackState::__Nonexhaustive => {
unreachable!("Unknown `MediaStreamTrackState`: {state:?}")
}
}
}
/// Returns a [`deviceId`][1] of the underlying [MediaStreamTrack][2].
///
/// # Panics
///
/// If the underlying [MediaStreamTrack][2] doesn't have [`deviceId`][1].
///
/// [1]: https://tinyurl.com/w3-streams#dom-mediatracksettings-deviceid
/// [2]: https://w3.org/TR/mediacapture-streams#mediastreamtrack
#[must_use]
pub fn device_id(&self) -> Option<String> {
get_property_by_name(&self.sys_track.get_settings(), "deviceId", |v| {
v.as_string()
})
}
/// Return a [`facingMode`][1] of the underlying [MediaStreamTrack][2].
///
/// [1]: https://tinyurl.com/w3-streams#dom-mediatracksettings-facingmode
/// [2]: https://w3.org/TR/mediacapture-streams#mediastreamtrack
#[must_use]
pub fn facing_mode(&self) -> Option<FacingMode> {
let facing_mode = get_property_by_name(
&self.sys_track.get_settings(),
"facingMode",
|v| v.as_string(),
);
facing_mode.and_then(|fm| match fm.as_ref() {
"user" => Some(FacingMode::User),
"environment" => Some(FacingMode::Environment),
"left" => Some(FacingMode::Left),
"right" => Some(FacingMode::Right),
_ => {
log::error!("Unknown FacingMode: {fm}");
None
}
})
}
/// Returns a [`height`][1] of the underlying [MediaStreamTrack][2].
///
/// [1]: https://tinyurl.com/w3-streams#dom-mediatracksettings-height
/// [2]: https://w3.org/TR/mediacapture-streams#mediastreamtrack
#[must_use]
pub fn height(&self) -> Option<u32> {
#[allow(
clippy::as_conversions,
clippy::cast_possible_truncation,
clippy::cast_sign_loss
)]
get_property_by_name(&self.sys_track.get_settings(), "height", |h| {
h.as_f64().map(|v| v as u32)
})
}
/// Return a [`width`][1] of the underlying [MediaStreamTrack][2].
///
/// [1]: https://w3.org/TR/mediacapture-streams#dom-mediatracksettings-width
/// [2]: https://w3.org/TR/mediacapture-streams#mediastreamtrack
#[must_use]
pub fn width(&self) -> Option<u32> {
#[allow(
clippy::as_conversions,
clippy::cast_possible_truncation,
clippy::cast_sign_loss
)]
get_property_by_name(&self.sys_track.get_settings(), "width", |w| {
w.as_f64().map(|v| v as u32)
})
}
/// Changes an [`enabled`][1] attribute in the underlying
/// [MediaStreamTrack][2].
///
/// [1]: https://w3.org/TR/mediacapture-streams#dom-mediastreamtrack-enabled
/// [2]: https://w3.org/TR/mediacapture-streams#mediastreamtrack
pub fn set_enabled(&self, enabled: bool) {
self.sys_track.set_enabled(enabled);
}
/// Changes a [`readyState`][1] attribute in the underlying
/// [MediaStreamTrack][2] to [`ended`][3].
///
/// [1]: https://tinyurl.com/w3-streams#dom-mediastreamtrack-readystate
/// [2]: https://w3.org/TR/mediacapture-streams#mediastreamtrack
/// [3]: https://tinyurl.com/w3-streams#idl-def-MediaStreamTrackState.ended
pub fn stop(&self) -> impl Future<Output = ()> + 'static {
self.sys_track.stop();
// For platform code uniformity.
future::ready(())
}
/// Returns an [`enabled`][1] attribute of the underlying
/// [MediaStreamTrack][2].
///
/// [1]: https://w3.org/TR/mediacapture-streams#dom-mediastreamtrack-enabled
/// [2]: https://w3.org/TR/mediacapture-streams#mediastreamtrack
#[must_use]
pub fn enabled(&self) -> bool {
self.sys_track.enabled()
}
/// Detects whether a video track captured from display searching
/// [specific fields][1] in its settings.
///
/// Only works in Chrome browser at the moment.
///
/// [1]: https://w3.org/TR/screen-capture/#extensions-to-mediatracksettings
#[must_use]
pub fn guess_is_from_display(&self) -> bool {
self.source_kind == Some(MediaSourceKind::Display)
}
/// Forks this [`MediaStreamTrack`].
///
/// Creates a new [`MediaStreamTrack`] from this [`MediaStreamTrack`] using
/// a [`clone()`][1] method. It won't clone current [`MediaStreamTrack`]'s
/// callbacks.
///
/// [1]: https://w3.org/TR/mediacapture-streams#dom-mediastreamtrack-clone
pub fn fork(&self) -> impl Future<Output = Self> + 'static {
future::ready(Self {
sys_track: Rc::new(web_sys::MediaStreamTrack::clone(
&self.sys_track,
)),
kind: self.kind,
source_kind: self.source_kind,
on_ended: RefCell::new(None),
})
}
/// Sets handler for the [`ended`][1] event on underlying
/// [`web_sys::MediaStreamTrack`].
///
/// # Panics
///
/// If binding to the [`ended`][1] event fails. Not supposed to ever happen.
///
/// [1]: https://tinyurl.com/w3-streams#event-mediastreamtrack-ended
pub fn on_ended<F>(&self, f: Option<F>)
where
F: 'static + FnOnce(),
{
let mut on_ended = self.on_ended.borrow_mut();
drop(match f {
None => on_ended.take(),
Some(f) => {
on_ended.replace(
// PANIC: Unwrapping is OK here, because this function
// shouldn't error ever.
#[allow(clippy::unwrap_used)] // intentional
EventListener::new_once(
Rc::clone(&self.sys_track),
"ended",
move |_| {
f();
},
)
.unwrap(),
)
}
});
}
/// Indicates whether an `OnAudioLevelChangedCallback` is supported for this
/// [`MediaStreamTrack`].
#[must_use]
pub const fn is_on_audio_level_available(&self) -> bool {
false
}
/// Sets the provided `OnAudioLevelChangedCallback` for this
/// [`MediaStreamTrack`].
///
/// It's called for live [`MediaStreamTrack`]s when their audio level
/// changes.
pub fn on_audio_level_changed<F>(&self, _callback: F)
where
F: 'static + FnMut(i32),
{
}
}