Online Sequencer Forums

Pages: 1 2 3
Now with note volume:
Code:
var resolution = 4; // how many times to subdivide each 1/4 note, 4 means 1/16 notes

var fftSize = 8192; // must be power of 2

var maxNotes = 1000; // maximum number of notes to add for each interval

var minIntensity = 128; // minimum volume for note to be added (0-255)

loadInstrument(13);

var el = $('<input type="file" accept="audio/*">');

$(document.body).append(el);

el.on('change', function(e){

  var reader = new FileReader();

  reader.onload = function (e) {

      var context = new AudioContext();

      context.decodeAudioData(e.target.result, function(buffer){

          var node = context.createAnalyser();

          node.fftSize = fftSize;

          node.smoothingTimeConstant = 0;

          node.maxDecibels = 0;

          var bufferLength = node.frequencyBinCount;

          var dataArray = new Uint8Array(bufferLength);

          var audioSource = context.createBufferSource();

          audioSource.buffer = buffer;

          audioSource.loop = false;

          audioSource.connect(node);

          var time = 0;

          audioSource.start(0);  

          setInterval(function(){

              node.getByteFrequencyData(dataArray);

              var f = []; // [index, amplitude]

              for (var i = 1; i < dataArray.length - 1; i++) {

                var isPeak = dataArray[i] >= dataArray[i-1] && dataArray[i] >= dataArray[i+1];

                if (isPeak) {

                  f.push([i, dataArray[i]]);

                }

              }

              f.sort(function(a, b){return b[1] - a[1]});

              var i = 0;

              var added = 0;

              var s = "";

              while (added < maxNotes) {

                var frequency = f[i][0] * context.sampleRate / node.fftSize;

                var note = piano[Math.round((piano.length*Math.log(2)+12*Math.log(55/frequency)+Math.log(4))/(Math.log(2)))];

                if (note != undefined && f[i][1] > minIntensity) {

                  song.addNote(new Note(song, note, time/resolution, 1/resolution, 13, (f[i][1]-minIntensity)/(255-minIntensity)));

                  added++;

                  s += "[" + note + " " + f[i][1] + "] ";

                }

                i++;

                if (i >= f.length) {

                   break;

                }

              }

              time++;

          }, song.sleepTime/resolution);

          setInterval(SequencerView.repaint, 1000);

      });

  }

  reader.readAsArrayBuffer(e.target.files[0]);

});

el.click();
Pages: 1 2 3
Cringe_Gaming_64yt

Jacob_
