From 9a8832fe90e3a3c50f4592c606e38c6b1544b3d7 Mon Sep 17 00:00:00 2001
From: Joel Wetzell <jwetzell@yahoo.com>
Date: Sat, 15 Mar 2025 12:01:50 -0500
Subject: [PATCH] add decoder for channel block

---
 src/decoders/index.ts                  |  2 ++
 src/decoders/lighting/channel-block.ts | 20 ++++++++++++++++++++
 src/models.ts                          |  6 ++++++
 tests/decode.test.js                   | 10 ++++++++++
 4 files changed, 38 insertions(+)
 create mode 100644 src/decoders/lighting/channel-block.ts

diff --git a/src/decoders/index.ts b/src/decoders/index.ts
index e55d22a..ea9be20 100644
--- a/src/decoders/index.ts
+++ b/src/decoders/index.ts
@@ -1,3 +1,4 @@
+import ChannelBlock from './lighting/channel-block';
 import CentroidAccelVelocity from './motion/centroid-accel-velocity';
 import CentroidPosition from './motion/centroid-position';
 import OrientationEuler from './motion/orientation-euler';
@@ -22,4 +23,5 @@ export const Decoders = {
   OrientationEuler,
   ZoneCollisionDetection,
   ZoneObject,
+  ChannelBlock,
 };
diff --git a/src/decoders/lighting/channel-block.ts b/src/decoders/lighting/channel-block.ts
new file mode 100644
index 0000000..616d8c6
--- /dev/null
+++ b/src/decoders/lighting/channel-block.ts
@@ -0,0 +1,20 @@
+import { ChannelBlock } from '../../models';
+
+export default (bytes: Uint8Array, isLittleEndian: boolean = false): ChannelBlock => {
+  if (bytes.length !== 5) {
+    throw new Error('Channel Block module must be 5 bytes');
+  }
+
+  const view = new DataView(bytes.buffer, bytes.byteOffset, bytes.byteLength);
+
+  const offset = view.getUint16(0);
+
+  const fade = view.getUint16(2, isLittleEndian);
+
+  const value = view.getUint8(4);
+  return {
+    offset,
+    fade,
+    value,
+  };
+};
diff --git a/src/models.ts b/src/models.ts
index 59b32e7..871cf42 100644
--- a/src/models.ts
+++ b/src/models.ts
@@ -114,3 +114,9 @@ export type ZoneObject = {
   nameLength: number;
   name: string;
 };
+
+export type ChannelBlock = {
+  offset: number;
+  fade: number;
+  value: number;
+};
diff --git a/tests/decode.test.js b/tests/decode.test.js
index 380e59c..3d90dca 100644
--- a/tests/decode.test.js
+++ b/tests/decode.test.js
@@ -251,6 +251,16 @@ const goodTests = [
     },
     decoder: Decoders.RTTrPM,
   },
+  {
+    description: 'Channel Block',
+    bytes: new Uint8Array([0x00, 0x08, 0x00, 0x06, 0x40]),
+    expected: {
+      offset: 0x08,
+      fade: 0x06,
+      value: 0x40,
+    },
+    decoder: Decoders.ChannelBlock,
+  },
 ];
 
 describe('RTTrP Bytes Decoding', () => {