I am trying to convert Float32 to Int16. But so far, is not effective. Because the output audio will generate lots of clippings (so, very poor audio output). I am using this function:
function convertoFloat32ToInt16(buffer) {
var l = buffer.length; //Buffer
var buf = new Int16Array(l/3);
while (l--) {
if (l==-1) break;
if (buffer[l]*0xFFFF > 32767)
buf[l] = 32767;
elseif (buffer[l]*0xFFFF < -32768)
buf[l] = -32768;
else
buf[l] = buffer[l]*0xFFFF;
}
return buf.buffer;
}
If I implement the gainNode() previously, the clipping effect is less perceptible. But is not a desirable way, because the purpose is to be effective in every microphones. The clipping effect is visible in this Matlab plot:
Replacing the while by this, is the solution:
while (l--) {
s = Math.max(-1, Math.min(1, samples[l]));
buf[l] = s < 0 ? s * 0x8000 : s * 0x7FFF;
//buf[l] = buffer[l]*0xFFFF; //old //convert to 16 bit
}
}
Now, the records sounds perfect and the Matlab plots to.
This is working for me:
const int16Array = Int16Array.from(buffer, x => x * 32767);
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