canopy/www/js/channel/mediaHandler.js

/*Canopy - The next generation of stoner streaming software
Copyright (C) 2024-2025 Rainbownapkin and the TTN Community

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 <https://www.gnu.org/licenses/>.*/

class mediaHandler{
    constructor(client, player, media){
        //Get parents
        this.client = client;
        this.player = player;

        this.lastTimestamp = 0;

        //Ingest media object from server
        this.startMedia(media);
    }

    startMedia(media){
        //If we properly ingested the media
        if(this.ingestMedia(media)){
            //Build the video player
            this.buildPlayer();

            //Call the start function
            this.start();
        }
    }

    buildPlayer(){
        //Create player
        this.video = document.createElement('video');
        //Append it to page
        this.player.videoContainer.appendChild(this.video);
        //Reset player lock
        this.lock = false;
    }

    destroyPlayer(){
        //Remove player from page
        this.video.remove();
        //Null out video property
        this.video = null;
    }

    ingestMedia(media){
        //Set now playing
        this.nowPlaying = media;
        
        //return true to signify success
        return true;
    }

    start(){
    }

    sync(timestamp = this.lastTimestamp){
    }

    reload(){
        //Get current timestamp
        const timestamp = this.video.currentTime;

        //Load video from source
        this.video.load();

        //Set it back to the proper time
        this.video.currentTime = timestamp;

        //Play the video
        this.video.play();
    }

    end(){
        this.nowPlaying = null;
        this.destroyPlayer();
    }

    play(){
    }

    pause(){
    }

    setPlayerLock(lock){
            //toggle controls
            this.video.controls = !lock;
            //Only toggle mute if we're locking, or if we're unlocking after being locked
            //If this is ran twice without locking we don't want to surprise unmute on the user
            if(lock || this.lock){
                //toggle mute
                this.video.muted = lock;
            }
            //toggle looping
            this.video.loop = lock;
            //set lock property
            this.lock = lock;
    }

    getRatio(){
        return this.video.videoWidth / this.video.videoHeight;
    } 

    getTimestamp(){
    }

    setVideoTitle(title){
        this.player.title.textContent = `Currently Playing: ${title}`;
    }
}

class nullHandler extends mediaHandler{
    constructor(client, player){
        //Call derived constructor
        super(client, player, {});
    }

    start(){
        //Lock the player
        this.setPlayerLock(true);

        //Set the static placeholder
        this.video.src = '/video/static.webm';

        //Set video title manually
        this.player.title.textContent = 'Channel Off Air';

        //play the placeholder video
        this.video.play();
    }
}

class rawFileHandler extends mediaHandler{
    constructor(client, player, media){
        //Call derived constructor
        super(client, player, media);

        //Since this media type has no way to tell between the user and code seek events, we need a flag to mark them 
        this.selfSeek = false;

        //Define listeners
        this.defineListeners();
    }

    defineListeners(){
        this.video.addEventListener('pause', this.onPause.bind(this));
        this.video.addEventListener('seeking', this.onSeek.bind(this));
    }

    start(){
        //Set video
        this.video.src = this.nowPlaying.id;

        //Set video title
        this.setVideoTitle(this.nowPlaying.title);

        //Unlock player
        this.setPlayerLock(false);

        //play video
        this.video.play();
    }

    play(){
        this.video.play();
    }

    pause(){
        this.video.pause();
    }

    sync(timestamp = this.lastTimestamp){
        //Set self seek flag
        this.selfSeek = true;

        //Set current video time based on timestamp received from server
        this.video.currentTime = timestamp;
    }

    reload(){
        //Throw self seek flag to make sure we don't un-sync the player
        this.selfSeek = true;        

        //Call derived reload function
        super.reload();
    }

    onPause(event){
        this.player.unlockSync();
    }

    onSeek(event){
        //If the video was seeked out-side of code
        if(!this.selfSeek){
            this.player.unlockSync();
        }

        //reset self seek flag
        this.selfSeek = false;
    }

    getTimestamp(){
        //Return current timestamp
        return this.video.currentTime;
    }
}