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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 EmitterMixin from '../../EmitterMixin'
import TrackSink from './TrackSink'
/**
* Sink node to add one or more tracks to a single stream.
*
* By default no slots are defined. Clients of this class need to call
* "addInputTrackSlot(trackId)" to add them as needed.
*
* The stream can be got with "getStream()". No stream is returned if all the
* input tracks are null. The stream will be recreated (so it will be a
* different object) if all the input tracks are set to null and then an input
* track is set again.
*
* Note that the order of the tracks in the stream is undefined, and unrelated
* to the order in which the input slots were added.
*
* The following events are emitted:
* - "streamSet", with "newStream" and "oldStream" parameters
* - "trackReplaced", with "newTrack" and "oldTrack" parameters
* - "trackEnabled", with "track" and "enabled" parameters
*
* See EmitterMixin documentation for details about the API.
*
* ---------------
* ---> | |
* ... | TrackToStream |
* ---> | |
* ---------------
*/
export default class TrackToStream extends TrackSink {
constructor() {
super()
this._superEmitterMixin()
this._stream = null
this._trackEnabledStates = {}
}
addInputTrackSlot(trackId) {
this._addInputTrackSlot(trackId)
}
getStream() {
return this._stream
}
_handleInputTrack(trackId, newTrack, oldTrack) {
// Only constraints changed, nothing to do
if (newTrack === oldTrack) {
// But trigger "trackEnabled" if the state changed
if (newTrack && this._trackEnabledStates[trackId] !== newTrack.enabled) {
this._trackEnabledStates[trackId] = newTrack.enabled
this._trigger('trackEnabled', [newTrack, newTrack.enabled])
}
return
}
if (!this._stream && newTrack) {
this._stream = new MediaStream()
this._trigger('streamSet', [this._stream, null])
}
if (this._stream && oldTrack) {
this._stream.removeTrack(oldTrack)
}
if (this._stream && newTrack) {
this._stream.addTrack(newTrack)
}
this._trackEnabledStates[trackId] = newTrack?.enabled
this._trigger('trackReplaced', [newTrack, oldTrack])
if (this._stream && this._stream.getTracks().length === 0) {
const oldStream = this._stream
this._stream = null
this._trigger('streamSet', [null, oldStream])
}
}
_handleInputTrackEnabled(trackId, enabled) {
this._trackEnabledStates[trackId] = enabled
this._trigger('trackEnabled', [this.getInputTrack(trackId), enabled])
}
}
EmitterMixin.apply(TrackToStream.prototype)
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