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/**
*
* @copyright Copyright (c) 2021, Daniel Calviño Sánchez (danxuliu@gmail.com)
*
* @license AGPL-3.0-or-later
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
import hark from 'hark'
import EmitterMixin from '../../EmitterMixin.js'
import TrackSink from './TrackSink.js'
/**
* Sink node to detect sound in its input track and emit "speaking" events.
*
* A single input track slot with the default id is accepted. The input track
* must be an audio track.
*
* The monitor is automatically started when an input track is set and stopped
* when set to null. The monitor does not stop if the input track ends; it is
* assumed that the source node will remove its output track in that case.
*
* The following events are emitted:
* - "speaking"
* - "speakingWhileMuted"
* - "stoppedSpeaking"
* - "stoppedSpeakingWhileMuted"
* - "volumeChange", with "volume" and "threshold" parameters
* - "volume" goes from -100 (silence) to 0 (loudest sound in the system)
* - "threshold" is the volume threshold to emit speaking events
*
* See EmitterMixin documentation for details about the API.
*
* -----------------
* | |
* ---> | SpeakingMonitor |
* | |
* -----------------
*/
export default class SpeakingMonitor extends TrackSink {
constructor() {
super()
this._superEmitterMixin()
this._addInputTrackSlot()
this._speaking = false
this._audioEnabled = false
}
_handleInputTrack(trackId, track) {
if (this._audioMonitor) {
this._audioMonitor.stop()
this._audioMonitor = null
}
if (this._clonedTrack) {
this._clonedTrack.stop()
this._clonedTrack = null
}
this._speaking = false
this._audioEnabled = false
if (!track) {
return
}
let timeout
this._audioEnabled = track.enabled
// The audio monitor uses its own cloned track that is always enabled to
// be able to analyze it even when the input track is muted. Note that
// even if the input track was muted when cloned it is still possible to
// unmute the clone.
this._clonedTrack = track.clone()
this._clonedTrack.enabled = true
this._audioMonitor = hark(new MediaStream([this._clonedTrack]))
this._audioMonitor.on('speaking', () => {
if (timeout) {
clearTimeout(timeout)
}
this._speaking = true
if (this._audioEnabled) {
this._trigger('speaking')
} else {
this._trigger('speakingWhileMuted')
}
})
this._audioMonitor.on('stopped_speaking', () => {
if (timeout) {
clearTimeout(timeout)
}
timeout = setTimeout(() => {
this._speaking = false
if (this._audioEnabled) {
this._trigger('stoppedSpeaking')
} else {
this._trigger('stoppedSpeakingWhileMuted')
}
}, 1000)
})
this._audioMonitor.on('volume_change', (volume, threshold) => {
this._trigger('volumeChange', [volume, threshold])
})
}
_handleInputTrackEnabled(trackId, enabled) {
if (this._audioEnabled === enabled) {
return
}
this._audioEnabled = enabled
if (!this._speaking) {
return
}
if (enabled) {
this._trigger('stoppedSpeakingWhileMuted')
this._trigger('speaking')
} else {
this._trigger('stoppedSpeaking')
this._trigger('speakingWhileMuted')
}
}
}
EmitterMixin.apply(SpeakingMonitor.prototype)
|
