Started work on SpectralView

Author: Stanislas Chevallier

Subtitler.xcodeproj/project.pbxproj

@@ -24,6 +24,7 @@
 		97924982270351FA00248C3D /* SubtitlerTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 97924981270351FA00248C3D /* SubtitlerTests.swift */; };
 		97924989270374C700248C3D /* PlayerControlsView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 97924988270374C700248C3D /* PlayerControlsView.swift */; };
 		9792498B2703802100248C3D /* Codable+SY.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9792498A2703802100248C3D /* Codable+SY.swift */; };
+		97A49D9827130B1A007844C8 /* SpectralView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 97A49D9727130B1A007844C8 /* SpectralView.swift */; };
 		97DF38302703F8FE002342CA /* SubtitleView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 97DF382F2703F8FE002342CA /* SubtitleView.swift */; };
 		97DF3834270407F7002342CA /* SizingTextField.swift in Sources */ = {isa = PBXBuildFile; fileRef = 97DF3833270407F7002342CA /* SizingTextField.swift */; };
 		97FAA54F270326DE00684B3F /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 974FAA7B2703223C008B539B /* Main.storyboard */; };
@@ -60,6 +61,7 @@
 		97924981270351FA00248C3D /* SubtitlerTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SubtitlerTests.swift; sourceTree = "<group>"; };
 		97924988270374C700248C3D /* PlayerControlsView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PlayerControlsView.swift; sourceTree = "<group>"; };
 		9792498A2703802100248C3D /* Codable+SY.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Codable+SY.swift"; sourceTree = "<group>"; };
+		97A49D9727130B1A007844C8 /* SpectralView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SpectralView.swift; sourceTree = "<group>"; };
 		97DF382F2703F8FE002342CA /* SubtitleView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SubtitleView.swift; sourceTree = "<group>"; };
 		97DF3833270407F7002342CA /* SizingTextField.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SizingTextField.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
@@ -118,6 +120,7 @@
 				97924988270374C700248C3D /* PlayerControlsView.swift */,
 				97027088270339EC001B5785 /* PlayerView.swift */,
 				97DF3833270407F7002342CA /* SizingTextField.swift */,
+				97A49D9727130B1A007844C8 /* SpectralView.swift */,
 				97DF382F2703F8FE002342CA /* SubtitleView.swift */,
 				972CAB6E27032591005E9C3D /* TimingButton.swift */,
 			);
@@ -315,6 +318,7 @@
 				972CAB7127032591005E9C3D /* NSTableView+SY.swift in Sources */,
 				97DF38302703F8FE002342CA /* SubtitleView.swift in Sources */,
 				9702708727033502001B5785 /* DocumentController.swift in Sources */,
+				97A49D9827130B1A007844C8 /* SpectralView.swift in Sources */,
 				97027089270339EC001B5785 /* PlayerView.swift in Sources */,
 				972CAB7327032591005E9C3D /* TimingButton.swift in Sources */,
 				97920DAA2711C8D100D9F678 /* NSView+SY.swift in Sources */,

Subtitler/Views/SpectralView.swift

@@ -0,0 +1,85 @@
+//
+//  SpectralView.swift
+//  Subtitler
+//
+//  Created by Stanislas Chevallier on 10/10/2021.
+//
+
+import Cocoa
+import AVFAudio
+import AVFoundation
+
+// https://betterprogramming.pub/audio-visualization-in-swift-using-metal-accelerate-part-1-390965c095d7
+class SpectralView: NSView {
+
+    // MARK: Init
+    override init(frame frameRect: NSRect) {
+        super.init(frame: frameRect)
+        setup()
+    }
+    
+    required init?(coder aDecoder: NSCoder) {
+        super.init(coder: aDecoder)
+        setup()
+    }
+
+    private func setup() {
+        /*
+        _ = engine.mainMixerNode
+        engine.prepare()
+
+        do {
+            try engine.start()
+        } catch {
+            print(error)
+        }
+        
+        //now we need to create our player node
+        let player = AVAudioPlayerNode()
+        
+        do {
+            //player nodes have a few ways to play-back music, the easiest way is from an AVAudioFile
+            let audioFile = try AVAudioFile(forReading: url)
+            
+            //audio always has a format, lets keep track of what the format is as an AVAudioFormat
+            let format = audioFile.processingFormat
+            print(format)
+            
+            //we now need to connect add the node to our engine. This part is a little weird but we first need
+            //to attach it to the engine itself before connecting it to the mainMixerNode. Recall that the
+            //mainMixerNode connects to the default outputNode, so now we'll have a complete playback path from
+            //our file to the outputNode!
+            engine.attach(player)
+            engine.connect(player, to: engine.mainMixerNode, format: format)
+            
+            //let's play the file!
+            //note: player must be attached first before scheduling a file to play
+            player.scheduleFile(audioFile, at: nil, completionHandler: nil)
+        } catch let error {
+            print(error.localizedDescription)
+        }
+        
+        //tap it to get the buffer data at playtime
+        engine.mainMixerNode.installTap(onBus: 0, bufferSize: 1024, format: nil) { (buffer, time) in
+
+        }
+        
+        //start playing the music!
+        player.play()
+         */
+    }
+
+    // MARK: Properties
+    private let engine = AVAudioEngine()
+    
+    // MARK: Content
+    /*
+    func load(url: URL) {
+        let node = AVAudioPlayerNode()
+        node.
+        engine.attach()
+    }
+    
+    func
+     */
+}