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// Radio Emulator
// Kaotisk Hund 2024
//
// A simple co-mechanism to pretend playing a live radio as it would happen for
// a radio station that mostly plays prerecoded shows.
//
// Client side implementation
// Let's remind here the structures we are waiting for:
// 1. Hash
// 2. 0
// 3. audio/ogg file
// 4. application/json file
//
// 1. Hash
// Can be an SHA512sum or SHA256sum, we don't do checks, we only ask the hash
// accompanied by what do we think it is.
//
// 2. 0
// When nothing exists on the radio station we are visiting.
//
// 3. audio/ogg file
// An audio file to play.
//
// 4. application/json file
// Could be one of the following:
// - list
// - show_info
//
var debugMode = false;
var audioElement = document.querySelector('audio');
var sourceElement = document.querySelector('source');
var currentTimeP = document.querySelector('.current-time');
var listStartedP = document.querySelector('.started-on');
var currentShowHash = document.querySelector('.current-show-hash');
var listHash = document.querySelector('.list-hash');
var artistP = document.querySelector('.artist');
var titleP = document.querySelector('.title');
var radioPlayerDiv = document.querySelector('.radio-player');
var youAreHere = document.querySelector('.you-are-here');
var ProgressBar = document.querySelector('progress');
var startsOnP = document.querySelector('.starts-on');
var showDurationP = document.querySelector('.show-duration');
var relativeTime = document.querySelector('.relative-time');
const documentTitle = "Radio Station Emulator";
const separator = " :: ";
function setTitleSyncing(){
document.title = "🔃Syncing" + separator + documentTitle;
}
function setTitleMessage(message){
document.title = message + separator + documentTitle;
}
var seconds_here = 0;
function increaseSeconds()
{
seconds_here = seconds_here+1;
youAreHere.innerText = seconds_here;
ProgressBar.value = parseInt(currentTimeP.innerText) + seconds_here;
relativeTime.innerText = parseInt(currentTimeP.innerText) + seconds_here;
return seconds_here;
}
function getSecondsHere()
{
return seconds_here;
}
setInterval(increaseSeconds, 1000);
function FetchJSON( url, callback, params )
{
setTitleSyncing();
const request = new XMLHttpRequest();
request.addEventListener("load", ()=>{
var json = JSON.parse(request.response);
if(request.status !== 404){
callback(json, params);
} else {
if ( debugMode ) console.log(`ERROR ${request.status} while loading ${url}`);
}
});
request.addEventListener("error", ()=>{
if ( debugMode ) console.log("An error occured. While loading: "+url+" for "+callback+".");
});
request.addEventListener("abort", ()=>{
if ( debugMode ) console.log("Request aborted: "+url+" for "+callback+".");
});
request.open("GET", url);
request.send();
}
function genericCallback(json, params)
{
if ( debugMode ) console.log('genericCallback');
if ( debugMode ) console.log(json);
if ( debugMode ) console.log(params);
}
var calledLoadShowCallback = 0;
function stopHereAndReflect()
{
return 0;
}
function loadShowCallback(json, params)
{
const [ list, now_on_sequence, element, hash_of_list ] = params;
if ( debugMode ) console.log('loadShowCallback');
if ( debugMode ) console.log(json);
if ( debugMode ) console.log(element);
if ( debugMode ) console.log(params);
listStartedP.innerText = list.started_on;
listHash.innerText = hash_of_list;
currentShowHash.innerText = json.hash;
artistP.innerText = json.artist;
titleP.innerText = json.title;
setTitleMessage ( "▶️ " + json.artist + " - " + json.title );
showDurationP.innerText = Math.floor(element.duration/1000);
startsOnP.innerText = element.starts_on;
ProgressBar.max = Math.floor(element.duration/1000);
sourceElement.src = "http://z.kaotisk-hund.com:8010/v0/audio/ogg/" + json.hash + "#t=" + Math.floor((now_on_sequence - element.starts_on)/1000);
sourceElement.type = json.mimetype;
audioElement.load();
if ( debugMode ) console.log('plays here: '+(now_on_sequence - element.starts_on)/1000);
audioElement.addEventListener('canplaythrough', function(){
if ( debugMode ) console.log('CAN PLAY THROUGH');
if ( calledLoadShowCallback < 100 )
{
calledLoadShowCallback++;
currentTimeP.innerText = ((now_on_sequence - element.starts_on)/1000);
audioElement.currentTime = ((now_on_sequence - element.starts_on)/1000);
audioElement.play();
}
});
audioElement.addEventListener('ended', function(){
location.reload();
});
var synced_at = sync_radio();
if ( debugMode ) console.log("Synced initially at : "+synced_at);
if ( synced_at === 0 )
{
if ( synced_at > audioElement.currentTime )
{
if ( debugMode ) console.log('Good sync!');
}
else
{
setTimeout(sync_radio, 10000);
}
}
}
function sync_radio()
{
var value = currentTimeP.innerText;
if ( value !== "" )
{
var new_now = parseFloat(value) + getSecondsHere();
if ( debugMode ) console.log("Trying to sync @ "+ value + " + " +getSecondsHere() + " = " + new_now);
audioElement.currentTime = new_now;
return new_now;
}
return 0;
}
function listCallback(json, params)
{
if ( debugMode ) console.log('listCallback');
var [ now, hash_of_list ] = params;
var delta_time = now - json.started_on;
var min_times_played = Math.floor( delta_time / json.duration );
var max_times_to_be_played = delta_time / json.duration;
var Dt = max_times_to_be_played - min_times_played;
var now_on_sequence = Dt * json.duration;
if ( debugMode ) console.log(`now_on_sequence: ${now_on_sequence}, Dt: ${Dt}`)
previous = { starts_on: 0 };
json.list.forEach((element)=>{
if ( now_on_sequence < element.starts_on && now_on_sequence > previous.starts_on){
} else {
now_on_sequence = now_on_sequence - previous.starts_on;
if ( debugMode ) console.log(now_on_sequence);
previous = element;
if ( debugMode ) console.log(element);
FetchJSON("http://z.kaotisk-hund.com:8010/v0/application/json/" + element.hash, loadShowCallback, [json, now_on_sequence, element, hash_of_list]);
}
});
}
function hashCallback(json, params)
{
var [ now ] = params;
if ( debugMode ) console.log('hashCallback');
FetchJSON('http://z.kaotisk-hund.com:8010/v0/application/json/' + json.latest_list, listCallback, [now, json.latest_list]);
}
FetchJSON('http://z.kaotisk-hund.com:8010/v0/list', hashCallback, [ new Date().getTime() ]);
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