Convert 16 bit signed int to 32 bit float about opus-recorder HOT 8 CLOSED

var maxPossible = 2**16/2; // Signed 16 bit is the data resolution.
... = (totalFile[i + j]) / maxPossible;

    function chunkBuffers(arrayBuffer, chunkLength, channelCount, bitDepth){
      var chunkedBuffers = [];

      var maxPossible = 2**bitDepth/2; // Bit depth is the data resolution.
      console.log('MAX POSSIBlE DATA VALUE', maxPossible);

      var totalFile = new Int16Array(arrayBuffer);
      // Skip wave header; 44 bytes
      for (i = 22; i < totalFile.length; i += chunkLength) {

        // Convert 16 bit signed int to 32bit float
        var bufferChunk = new Float32Array(chunkLength/channelCount); // Just keep 1st channel. So, divide length.
        var idx = 0; // To just keep 1st channel and skip the rest.
        for (j = 0 ; j < chunkLength ; j+=channelCount) { // Just keep 1st channel by `j+=`.

          // UPDATE: Not desirable:
          // bufferChunk[idx] = (totalFile[i + j]) / maxPossible;
          
          // UPDATE: Shifting the 0 crossing and keeping the two halves of the waveform symmetric,
          // by `+-0.5` statements:
          bufferChunk[idx] = (totalFile[i + j]+ 0.5) / (maxPossible-0.5);

          idx++;
        }

        chunkedBuffers.push([bufferChunk]) ;
      };

      return chunkedBuffers 
    };

chunkBuffers(arrayBuffer, bufferLength, 2, 16).forEach(...)

chunkBuffers(arrayBuffer, bufferLength, 1, 16).forEach(...)

      // Shifting the 0 crossing and keeping the two halves of the waveform symmetric,
      // by `+-0.5` statements:
      bufferChunk[idx] = (totalFile[i + j]+ 0.5) / (maxPossible-0.5);