audio-player: decode function completed

cmd/audio-player/adpcm.js

@@ -30,6 +30,10 @@ let est, // Estimation of sample based on quantised ADPCM nibble.
 	idx, // Index to step used for estimation.
 	step;
 
+function decodeSample(nibble) {
+	return new Uint8Array([1, 2])
+}
+
 function decode(b) {
 	// b should be a Uint8Array
 	if (!(b instanceof Uint8Array)) {
@@ -49,15 +53,15 @@ function decode(b) {
 		var nib2 = twoNibs >> 4;
 		var nib1 = (nib2 << 4) ^ twoNibs
 		var firstBytes = decodeSample(nib1)
-		concat(result, firstBytes)
+		result = concat(result, firstBytes)
 
 		var secondBytes = decodeSample(nib2)
-		concat(result, secondBytes)
+		result = concat(result, secondBytes)
 	}
 	if (b[3] == 1) {
 		var padNib = b[b.length - 1]
 		var samp = decodeSample(padNib)
-		concat(result, samp)
+		result = concat(result, samp)
 	}
 
 	return result;

cmd/audio-player/index.html

@@ -5,6 +5,7 @@
     <meta charset="utf-8">
     <title>Audio Player</title>
     <script type="text/javascript" src="pcm-player.min.js"></script>
+    <script type="text/javascript" src="adpcm.js"></script>
     <script type="text/javascript" src="main.js"></script>
     <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"
         integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">

cmd/audio-player/main.js

@@ -7,14 +7,21 @@ window.onload = function () {
         reader.onload = event => {
             bytes = new Uint8Array(event.target.result)
 
+            console.log(bytes.slice(0, 16))
+
+            var decoded = decode(bytes)
+
             console.log("playing file")
-            var player = new PCMPlayer({
-                encoding: '16bitInt',
-                channels: 1,
-                sampleRate: 48000,
-                flushingTime: 2000
-            });
-            player.feed(bytes)
+
+            console.log(decoded.slice(0, 16))
+
+            // var player = new PCMPlayer({
+            //     encoding: '16bitInt',
+            //     channels: 1,
+            //     sampleRate: 48000,
+            //     flushingTime: 2000
+            // });
+            // player.feed(bytes)
         }
         reader.onerror = error => reject(error)
         reader.readAsArrayBuffer(input)