Initial commit

Author: getoffmyhack

.gitignore

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+
+# Created by https://www.gitignore.io/api/swift,macos
+
+### macOS ###
+*.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+### Swift ###
+# Xcode
+#
+# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
+
+## Build generated
+build/
+DerivedData/
+
+## Various settings
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata/
+
+## Other
+*.moved-aside
+*.xccheckout
+*.xcscmblueprint
+
+## Obj-C/Swift specific
+*.hmap
+*.ipa
+*.dSYM.zip
+*.dSYM
+
+## Playgrounds
+timeline.xctimeline
+playground.xcworkspace
+
+# Swift Package Manager
+#
+# Add this line if you want to avoid checking in source code from Swift Package Manager dependencies.
+# Packages/
+# Package.pins
+.build/
+
+# CocoaPods - Refactored to standalone file
+
+# Carthage - Refactored to standalone file
+
+# fastlane
+#
+# It is recommended to not store the screenshots in the git repo. Instead, use fastlane to re-generate the
+# screenshots whenever they are needed.
+# For more information about the recommended setup visit:
+# https://docs.fastlane.tools/best-practices/source-control/#source-control
+
+fastlane/report.xml
+fastlane/Preview.html
+fastlane/screenshots
+fastlane/test_output
+
+# End of https://www.gitignore.io/api/swift,macos

Readme.md

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+# waveSDR
+
+A macOS native desktop Software Defined Radio application using the RTL-SDR USB device.
+
+**NB**:  This is purely experimental software.  I am using this application as a platform for teaching myself macOS desktop application programming as well as DSP techniques.  As it is, there are numerous sections of code where improvement is needed.
+
+Features:
+
+* RTL-SDR hardware
+* Spectrum Analyzer
+* Spectrogram
+* AM Demodulator
+* FM Narrow Demodulator
+* FM Wide Demodulator (mono only)
+
+
+

waveSDR.xcodeproj/project.pbxproj

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+//
+//  AMDemodulatorBlock.swift
+//  waveSDR
+//
+//  Copyright © 2017 GetOffMyHack. All rights reserved.
+//
+
+import Foundation
+import Accelerate
+
+class AMDemodulatorBlock: RadioBlock {
+    
+    var notifyQueue:    DispatchQueue?
+    
+    var samplesOut:     ((Samples) -> ())? = nil
+    
+    var name:           String = "AM"
+    
+    var amGain:         Float = 5.0
+    
+    //--------------------------------------------------------------------------
+    //
+    //
+    //
+    //--------------------------------------------------------------------------
+
+    init() {
+        notifyQueue = nil
+    }
+    
+    init(withNotifyQueue queue: DispatchQueue) {
+        notifyQueue = queue
+    }
+    
+    deinit {
+        self.unlink()
+    }
+    
+    //--------------------------------------------------------------------------
+    //
+    //
+    //
+    //--------------------------------------------------------------------------
+
+    func unlink() {
+        self.samplesOut = nil
+    }
+
+    //--------------------------------------------------------------------------
+    //
+    //
+    //
+    //--------------------------------------------------------------------------
+
+    func samplesIn(_ samples: Samples) {
+        
+        // create mutable copy of sample struct
+        var samples = samples
+        
+        // create output buffer
+        var output:     [Float]         = [Float](repeating: 0.0, count: samples.count)
+        
+        // convert to DSPSplitComplex type
+        var inSamples:  DSPSplitComplex = samples.asDSPSplitComplex()
+        
+        // process samples
+        vDSP_zvabs(&inSamples, vDSP_Stride(1), &output, vDSP_Stride(1), vDSP_Length(samples.count))
+        
+        // apply amGain
+        vDSP_vsmul(&output, vDSP_Stride(1), &amGain, &output, vDSP_Stride(1), vDSP_Length(samples.count))
+        
+        // update samples struct
+        samples.audio = output
+        samples.type = .audio
+        
+        // the reference to samplesOut may become nil at any time so
+        // check to make sure it exists before sending samples out
+        if(samplesOut != nil) {
+            self.samplesOut!(samples)
+        }
+        
+    }
+    
+    //--------------------------------------------------------------------------
+    //
+    //
+    //
+    //--------------------------------------------------------------------------
+    
+    func getStatusFor(key: String) -> Any? {
+        return nil
+    }
+
+}