From a0d12ecbac8fe327d1dcd4580fee594e24d4191b Mon Sep 17 00:00:00 2001
From: Arturs Artamonovs <arturs.artamonovs@protonmail.com>
Date: Mon, 6 Jan 2025 12:30:49 +0000
Subject: Waterfall: UI drawing from file

---
 Radio/Utils/WaterfallFile/NaiveFFT512.swift | 49 +++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 Radio/Utils/WaterfallFile/NaiveFFT512.swift

(limited to 'Radio/Utils/WaterfallFile/NaiveFFT512.swift')

diff --git a/Radio/Utils/WaterfallFile/NaiveFFT512.swift b/Radio/Utils/WaterfallFile/NaiveFFT512.swift
new file mode 100644
index 0000000..b4dca7e
--- /dev/null
+++ b/Radio/Utils/WaterfallFile/NaiveFFT512.swift
@@ -0,0 +1,49 @@
+//
+//  NaiveFFT.swift
+//  PrySDR
+//
+//  Created by Jacky Jack on 05/01/2025.
+//
+
+import Foundation
+import Accelerate
+
+//SUpports now only fixed sizes and not flexible implementation just a PoC
+class NaiveFFT512 {
+    
+    static let sampleCount = 512
+    let forwardDCT = vDSP.DCT(count: sampleCount, transformType: .II)!
+    
+    init() {
+        
+    }
+    
+    func getSampleCount() -> Int {
+        return NaiveFFT512.sampleCount
+    }
+    
+    func computeLine(_ processingArray: [Int8]) -> [Float] {
+        
+        var dataFloat = [Float](repeating: 0.0, count: NaiveFFT512.sampleCount)
+        
+        if processingArray.count != NaiveFFT512.sampleCount {
+            print("Not supporting arrays not equail to \(NaiveFFT512.sampleCount)")
+            return []
+        }
+        
+        vDSP.convertElements(of: processingArray, to: &dataFloat)
+        //dataFloat = vDSP.add(127.0, dataFloat)
+        //print(dataFloat)
+        
+        //move from -127.0 to 128.0 range -1.0...1.0
+        //var adjusted = vDSP.divide(dataFloat, Float(sampleCount))
+        var adjusted = dataFloat
+        //print(adjusted)
+        
+        var transform_result = forwardDCT.transform(adjusted)
+        transform_result = vDSP.absolute(transform_result)
+        
+        return transform_result
+    }
+    
+}
-- 
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