From f923a3824561c6cf200c638e3d44d1cbf4adf7d8 Mon Sep 17 00:00:00 2001
From: Arturs Artamonovs <arturs.artamonovs@protonmail.com>
Date: Sun, 5 Jan 2025 10:07:35 +0000
Subject: Waterfall: drawing from file initial implementatiom, visual version
 concept is ready

---
 Radio/Utils/WaterfallFile/main.swift | 113 +++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 Radio/Utils/WaterfallFile/main.swift

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

diff --git a/Radio/Utils/WaterfallFile/main.swift b/Radio/Utils/WaterfallFile/main.swift
new file mode 100644
index 0000000..cf72d56
--- /dev/null
+++ b/Radio/Utils/WaterfallFile/main.swift
@@ -0,0 +1,113 @@
+//
+//  main.swift
+//  WaterfallFile
+//
+//  Created by Jacky Jack on 23/12/2024.
+//
+
+import Foundation
+import Accelerate
+
+print("Read binary file")
+
+let input_filename="rtlsdr_100M_m.cu8"
+
+
+//get data from u8 file
+let dir = getCurrentExecutableDir()
+let filemgr = FileManager.default
+
+if !filemgr.fileExists(atPath: input_filename) {
+    print("Cant find file \(input_filename)")
+    exit(0)
+}
+
+let fileHandle: FileHandle? = FileHandle(forReadingAtPath: dir+"/"+input_filename)
+var i8_arr:[Int8]? = nil
+if let file = fileHandle {
+    file.seek(toFileOffset: 0)
+    do {
+        if let databuf = try file.readToEnd() {
+            
+            print("read \(databuf.count) \(databuf) bytes")
+            //let temp_arr = [Int8](databuf)
+            i8_arr = [Int8](repeating: 0, count: databuf.count)
+            
+            for i in 0..<i8_arr!.count {
+                print(String(format:"%02X", databuf[i]),terminator: "")
+                //convert from 0..255 to -127..128
+                let val = databuf[i]
+                if val <= 127 {
+                    i8_arr![i] = Int8(val)-127
+                } else {
+                    i8_arr![i] = Int8(val-128)
+                }
+                //print(String(format:"%02X", i8_arr![i]),terminator: "")
+            }
+        }
+    } catch {
+        print(error)
+        exit(0)
+    }
+    
+}
+fileHandle?.closeFile()
+
+//all data in buffer lets process data
+//convert all u8 data to float's
+
+//is there other ways to do that?
+/*for i in 0..<dataFloat.count {
+    dataFloat[i] = Float(u8_arr![i])
+}*/
+//will generate 512x512 image
+let sampleCount = 512
+let img = SimpleImage(width: sampleCount, height: sampleCount)
+let number_of_lines = (i8_arr!.count/sampleCount)
+let forwardDCT = vDSP.DCT(count: sampleCount, transformType: .II)!
+var frequencyDomain:[Float] = []
+var transform_result:[Float] = .init(repeating: 0.0, count: sampleCount)
+var dataFloat = [Float](repeating: 0.0, count: sampleCount)
+for i in 0..<sampleCount {
+    let sample_idx = i*sampleCount
+    if i < number_of_lines {
+        let processingSlice = i8_arr![sample_idx...sample_idx+512-1]
+        let processingArray = Array(processingSlice)
+        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)
+        
+        transform_result = forwardDCT.transform(adjusted)
+        transform_result = vDSP.absolute(transform_result)
+        let max = vDSP.maximum(transform_result)
+        //print("max=\(max)")
+        //frequencyDomain.append(contentsOf: transform_result)
+        img.drawPalletLine(line: i, pixelLine: transform_result)
+        //print(transform_result)
+    } else {
+        img.drawPalletLine(line: i, pixelLine: transform_result)
+    }
+    
+}
+
+img.drawPixel(0, 0, PixelData(a: 255, r: 255, g: 0, b: 0))
+img.drawPixel(sampleCount-1, 0, PixelData(a: 255, r: 0, g: 255, b: 0))
+img.drawPixel(0, sampleCount-1, PixelData(a: 255, r: 0, g: 255, b: 0))
+img.drawPixel(sampleCount-1, sampleCount-1, PixelData(a: 255, r: 0, g: 0, b: 255))
+
+
+//print(dataFloat)
+
+
+
+//output data to image file
+img.saveAsJPEG("fft_100m_512.jpeg")
+
+
+
+print("All computations are done")
-- 
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