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import * as Channel from 'jschannel'
import { EventRegistrar } from './events'
import { EventHandler, PlayerEventType, PeerTubeResolution } from './definitions'
const PASSTHROUGH_EVENTS = [
'pause',
'play',
'playbackStatusUpdate',
'playbackStatusChange',
'resolutionUpdate',
'volumeChange'
]
/**
* Allows for programmatic control of a PeerTube embed running in an <iframe>
* within a web page.
*/
export class PeerTubePlayer {
private eventRegistrar: EventRegistrar = new EventRegistrar()
private channel: Channel.MessagingChannel
private readyPromise: Promise<void>
/**
* Construct a new PeerTubePlayer for the given PeerTube embed iframe.
* Optionally provide a `scope` to ensure that messages are not crossed
* between multiple PeerTube embeds. The string passed here must match the
* `scope=` query parameter on the embed URL.
*
* @param embedElement
* @param scope
*/
constructor (
private embedElement: HTMLIFrameElement,
private scope?: string
) {
this.eventRegistrar.registerTypes(PASSTHROUGH_EVENTS)
this.constructChannel()
this.prepareToBeReady()
}
/**
* Destroy the player object and remove the associated player from the DOM.
*/
destroy () {
this.embedElement.remove()
}
/**
* Listen to an event emitted by this player.
*
* @param event One of the supported event types
* @param handler A handler which will be passed an event object (or undefined if no event object is included)
*/
addEventListener (event: PlayerEventType, handler: EventHandler<any>): boolean {
return this.eventRegistrar.addListener(event, handler)
}
/**
* Remove an event listener previously added with addEventListener().
*
* @param event The name of the event previously listened to
* @param handler
*/
removeEventListener (event: PlayerEventType, handler: EventHandler<any>): boolean {
return this.eventRegistrar.removeListener(event, handler)
}
/**
* Promise resolves when the player is ready.
*/
get ready (): Promise<void> {
return this.readyPromise
}
/**
* Tell the embed to start/resume playback
*/
async play () {
await this.sendMessage('play')
}
/**
* Tell the embed to pause playback.
*/
async pause () {
await this.sendMessage('pause')
}
/**
* Tell the embed to change the audio volume
* @param value A number from 0 to 1
*/
async setVolume (value: number) {
await this.sendMessage('setVolume', value)
}
/**
* Get the current volume level in the embed.
* @param value A number from 0 to 1
*/
async getVolume (): Promise<number> {
return this.sendMessage<void, number>('getVolume')
}
/**
* Tell the embed to seek to a specific position (in seconds)
* @param seconds
*/
async seek (seconds: number) {
await this.sendMessage('seek', seconds)
}
/**
* Tell the embed to switch resolutions to the resolution identified
* by the given ID.
*
* @param resolutionId The ID of the resolution as found with getResolutions()
*/
async setResolution (resolutionId: any) {
await this.sendMessage('setResolution', resolutionId)
}
/**
* Retrieve a list of the available resolutions. This may change later, listen to the
* `resolutionUpdate` event with `addEventListener` in order to be updated as the available
* resolutions change.
*/
async getResolutions (): Promise<PeerTubeResolution[]> {
return this.sendMessage<void, PeerTubeResolution[]>('getResolutions')
}
/**
* Retrieve a list of available playback rates.
*/
async getPlaybackRates (): Promise<number[]> {
return this.sendMessage<void, number[]>('getPlaybackRates')
}
/**
* Get the current playback rate. Defaults to 1 (1x playback rate).
*/
async getPlaybackRate (): Promise<number> {
return this.sendMessage<void, number>('getPlaybackRate')
}
/**
* Set the playback rate. Should be one of the options returned by getPlaybackRates().
* Passing 0.5 means half speed, 1 means normal, 2 means 2x speed, etc.
*
* @param rate
*/
async setPlaybackRate (rate: number) {
await this.sendMessage('setPlaybackRate', rate)
}
private constructChannel () {
this.channel = Channel.build({
window: this.embedElement.contentWindow,
origin: '*',
scope: this.scope || 'peertube'
})
this.eventRegistrar.bindToChannel(this.channel)
}
private prepareToBeReady () {
let readyResolve: Function
let readyReject: Function
this.readyPromise = new Promise<void>((res, rej) => {
readyResolve = res
readyReject = rej
})
this.channel.bind('ready', success => success ? readyResolve() : readyReject())
this.channel.call({
method: 'isReady',
success: isReady => isReady ? readyResolve() : null
})
}
private sendMessage<TIn, TOut> (method: string, params?: TIn): Promise<TOut> {
return new Promise<TOut>((resolve, reject) => {
this.channel.call({
method, params,
success: result => resolve(result),
error: error => reject(error)
})
})
}
}
// put it on the window as well as the export
window[ 'PeerTubePlayer' ] = PeerTubePlayer
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