echopreview.js

var newsource;

function echopreview1(){

    clearInterval(intervalid12);
    clearInterval(intervalid);
    clearInterval(videointerval)
    var start = parseFloat(document.getElementById("start").value);
    var end = parseFloat(document.getElementById("end").value);
    var delay= parseFloat(document.getElementById("delay").value);
    var feedback = parseFloat(document.getElementById("feedback").value);
  

time = parseInt(start);




  



var final = end - start;

if (sourcecheck === null){

    
    if(source){
        source.stop();
    }


    if(source1){
        source1.stop();
    }

}

if (check === null ){

document.getElementById("error").innerHTML = "Please select a file"

}

else if (bufferarray===null){

document.getElementById("error").innerHTML = "No data available"

}

else if (isNaN(start)){
document.getElementById("error").innerHTML = "Starting point is not a number"


}
else if (start >= source.buffer.duration){
document.getElementById("error").innerHTML = "starting point is greater than or equal to source buffer duration"

} 

else if (start < 0 )
{

document.getElementById("error").innerHTML = "Starting Point must be greater than 0"

}
else if (start >= end) {
document.getElementById("error").innerHTML = "Starting Point must be less than Ending Point"

}

else if (isNaN(end)){
document.getElementById("error").innerHTML = "Ending Point is not a number"
} 
else if ( end > source.buffer.duration ){

document.getElementById("error").innerHTML = "Ending point is greater than  duration"

end < 0 }

else if ( end <= start){

document.getElementById("error").innerHTML = "Ending Point is greater than equal to Starting Point"

}

else if (isNaN(delay)|| isNaN(feedback)){

    
}

else{

const offlineCtx = new AudioContext();
   
var array1 = new Float32Array(end*bufferarray.sampleRate -start*bufferarray.sampleRate)

bufferarray.copyFromChannel(array1, 0, start*bufferarray.sampleRate)

var sourcebuffer = offlineCtx.createBuffer(bufferarray.numberOfChannels, array1.length, bufferarray.sampleRate);

var channeldata = sourcebuffer.getChannelData(0)

channeldata.set(array1)

source1 = offlineCtx.createBufferSource();
source1.buffer = sourcebuffer;
const delayNode = offlineCtx.createDelay();
delayNode.delayTime.value = delay;


const feedbackNode = offlineCtx.createGain();
feedbackNode.gain.value = feedback;

source1.connect(delayNode);
delayNode.connect(feedbackNode);
feedbackNode.connect(delayNode); // Create a feedback loop
delayNode.connect(offlineCtx.destination);


source1.start(0)
        
         
}}