Clean up PCM code

src/pcm.ts

@@ -1,4 +1,5 @@
 // https://github.com/dystopiancode/pcm-g711/blob/master/pcm-g711/g711.c
+
 export const toUlaw = (s16: number) => {
 	const MULAW_MAX = 0x1FFF;
 	const MULAW_BIAS = 33;
@@ -9,29 +10,24 @@ export const toUlaw = (s16: number) => {
 	let position = 12;
 	let lsb = 0;
 
-	// Handle negative numbers
 	if (number < 0) {
 		number = -number;
 		sign = 0x80;
 	}
 
-	// Add bias
 	number += MULAW_BIAS;
 
-	// Clip to maximum
 	if (number > MULAW_MAX) {
 		number = MULAW_MAX;
 	}
 
-	// Find position of first 1 in the number
-	for (; ((number & mask) !== mask && position >= 5); mask >>= 1, position--) {
-		// Empty loop body - all work done in condition
+	while ((number & mask) !== mask && position >= 5) {
+		mask >>= 1;
+		position--;
 	}
 
-	// Extract least significant bits
 	lsb = (number >> (position - 4)) & 0x0f;
 
-	// Combine sign, position and lsb, then invert all bits
 	return ~(sign | ((position - 5) << 4) | lsb) & 0xFF;
 };
 
@@ -40,19 +36,15 @@ export const fromUlaw = (u8: number) => {
 	let sign = 0;
 	let position = 0;
 
-	// Get byte and invert
 	let number = ~u8;
 
-	// Handle sign
 	if (number & 0x80) {
 		number &= ~(1 << 7);
 		sign = -1;
 	}
 
-	// Calculate position
 	position = ((number & 0xF0) >> 4) + 5;
 
-	// Reconstruct linear value
 	const decoded = ((1 << position) | ((number & 0x0F) << (position - 4))
 		| (1 << (position - 5))) - MULAW_BIAS;
 
@@ -68,26 +60,22 @@ export const toAlaw = (s16: number) => {
 
 	let number = s16;
 
-	// Handle negative numbers
 	if (number < 0) {
 		number = -number;
 		sign = 0x80;
 	}
 
-	// Clip to maximum
 	if (number > ALAW_MAX) {
 		number = ALAW_MAX;
 	}
 
-	// Find position of first 1 in the number
-	for (; ((number & mask) !== mask && position >= 5); mask >>= 1, position--) {
-		// Empty loop body - all work done in condition
+	while ((number & mask) !== mask && position >= 5) {
+		mask >>= 1;
+		position--;
 	}
 
-	// Extract least significant bits
 	lsb = (number >> ((position === 4) ? 1 : (position - 4))) & 0x0f;
 
-	// Combine sign, position and lsb, then XOR with 0x55
 	return (sign | ((position - 4) << 4) | lsb) ^ 0x55;
 };
 
@@ -95,19 +83,15 @@ export const fromAlaw = (u8: number) => {
 	let sign = 0x00;
 	let position = 0;
 
-	// Get byte and XOR with 0x55
 	let number = u8 ^ 0x55;
 
-	// Handle sign
 	if (number & 0x80) {
 		number &= ~(1 << 7);
 		sign = -1;
 	}
 
-	// Calculate position
 	position = ((number & 0xF0) >> 4) + 4;
 
-	// Reconstruct linear value
 	let decoded = 0;
 	if (position !== 4) {
 		decoded = ((1 << position) | ((number & 0x0F) << (position - 4))