Release version 2.1.0 and add MIDI broadcasting and handling

Updated `build.gradle.kts` to finalize version 2.1.0. Introduced `Broadcaster` and `Midi` classes for MIDI message broadcasting, synchronization, and handling. Added support for MIDI input/output devices with state management and message processing capabilities.

build.gradle.kts

@@ -10,7 +10,7 @@ plugins {
 }
 
 group = "nl.astraeus"
-version = "2.1.0-SNAPSHOT"
+version = "2.1.0"
 
 repositories {
     mavenCentral()

src/jsMain/kotlin/nl/astraeus/vst/midi/Broadcaster.kt

@@ -0,0 +1,110 @@
+@file:OptIn(ExperimentalJsExport::class)
+
+package nl.astraeus.vst.midi
+
+import kotlinx.browser.window
+import org.khronos.webgl.Uint8Array
+import org.w3c.dom.BroadcastChannel
+import org.w3c.dom.MessageEvent
+import kotlin.math.min
+
+@JsExport
+enum class MessageType {
+  SYNC,
+  MIDI
+}
+
+@JsExport
+class SyncMessage(
+  @JsName("timeOrigin")
+  val timeOrigin: Double = window.performance.asDynamic().timeOrigin,
+  @JsName("now")
+  val now: Double = window.performance.now()
+) {
+  @JsName("type")
+  val type: String = MessageType.SYNC.name
+}
+
+// time -> syncOrigin
+// receive syn message
+// syncOrigin = my timeOrigin - sync.timeOrigin
+// - sync.timeOrigin = 50
+// - my.timeOrigin = 100
+// - syncOrigin = -50
+
+// - sync.timeOrigin = 49
+// - my.timeOrigin = 100
+// - syncOrigin = update to -51
+
+@JsExport
+class MidiMessage(
+  @JsName("data")
+  val data: Uint8Array,
+  @JsName("timestamp")
+  val timestamp: dynamic = null,
+  @JsName("timeOrigin")
+  val timeOrigin: dynamic = window.performance.asDynamic().timeOrigin
+) {
+  @JsName("type")
+  val type = MessageType.MIDI.name
+}
+
+object Sync {
+  var syncOrigin = 0.0
+
+  fun update(sync: SyncMessage) {
+    syncOrigin = min(syncOrigin, window.performance.asDynamic().timeOrigin - sync.timeOrigin)
+  }
+
+  fun now(): Double = window.performance.now() + syncOrigin
+}
+
+object Broadcaster {
+  val channels = mutableMapOf<Int, BroadcastChannel>()
+
+  fun getChannel(channel: Int): BroadcastChannel = channels.getOrPut(channel) {
+    println("Opening broadcast channel $channel")
+    val bcChannel = BroadcastChannel("audio-worklet-$channel")
+
+    bcChannel.onmessage = { event ->
+      onMessage(channel, event)
+    }
+
+    bcChannel
+  }
+
+  private fun onMessage(channel: Int, event: MessageEvent) {
+    val data: dynamic = event.data.asDynamic()
+
+    console.log(
+      "Received broadcast message on channel $channel",
+      event
+    )
+    if (data.type == MessageType.SYNC.name) {
+      val syncMessage = SyncMessage(
+        data.timeOrigin,
+        data.now
+      )
+      Sync.update(syncMessage)
+    } else {
+      console.log(
+        "Received broadcast message on channel $channel",
+        event,
+        window.performance,
+        window.performance.now() - event.timeStamp.toDouble()
+      )
+    }
+  }
+
+  fun send(channel: Int, message: Any) {
+    console.log("Sending broadcast message on channel $channel:", message)
+    getChannel(channel).postMessage(message)
+  }
+
+  fun sync() {
+    for (channel in channels.values) {
+      channel.postMessage(SyncMessage())
+    }
+  }
+
+}

src/jsMain/kotlin/nl/astraeus/vst/midi/Midi.kt

@@ -0,0 +1,160 @@
+package nl.astraeus.vst.midi
+
+import kotlinx.browser.window
+import org.khronos.webgl.Uint8Array
+import org.khronos.webgl.get
+
+external class MIDIInput {
+  val connection: String
+  val id: String
+  val manufacturer: String
+  val name: String
+  val state: String
+  val type: String
+  val version: String
+  var onmidimessage: (dynamic) -> Unit
+  var onstatechange: (dynamic) -> Unit
+
+  fun open()
+  fun close()
+}
+
+external class MIDIOutput {
+  val connection: String
+  val id: String
+  val manufacturer: String
+  val name: String
+  val state: String
+  val type: String
+  val version: String
+
+  fun send(message: dynamic, timestamp: dynamic)
+
+  fun open()
+  fun close()
+}
+
+object Midi {
+  var outputChannel: Int = -1
+
+  var inputs = mutableListOf<MIDIInput>()
+  var outputs = mutableListOf<MIDIOutput>()
+  var currentInput: MIDIInput? = null
+  var currentOutput: MIDIOutput? = null
+
+  fun start(
+    onUpdate: () -> Unit,
+  ) {
+    val navigator = window.navigator.asDynamic()
+
+    navigator.requestMIDIAccess().then(
+      { midiAccess ->
+        val inp = midiAccess.inputs
+        val outp = midiAccess.outputs
+
+        console.log("Midi inputs:", inputs)
+        console.log("Midi outputs:", outputs)
+
+        inp.forEach() { input ->
+          console.log("Midi input:", input)
+          inputs.add(input)
+          console.log("Name: ${(input as? MIDIInput)?.name}")
+        }
+
+        outp.forEach() { output ->
+          console.log("Midi output:", output)
+          outputs.add(output)
+        }
+
+        onUpdate()
+      },
+      { e ->
+        println("Failed to get MIDI access - $e")
+      }
+    )
+  }
+
+  fun setInput(
+    id: String,
+    name: String = "",
+    onMidiInput: (data: Uint8Array) -> Unit
+  ) {
+    var selected = inputs.find { it.id == id }
+    if (selected == null) {
+      var maxMatchChar = 0
+      inputs.forEach {
+        val matchChars = matchChars(it.name, name)
+        if (matchChars > maxMatchChar) {
+          selected = it
+          maxMatchChar = matchChars
+        }
+      }
+    }
+    setInput(selected, onMidiInput)
+  }
+
+  private fun matchChars(str1: String, str2: String): Int {
+    var result = 0
+    if (str1.length > str2.length) {
+      for (ch in str1.toCharArray()) {
+        if (str2.contains(ch)) {
+          result++
+        }
+      }
+    } else {
+      for (ch in str2.toCharArray()) {
+        if (str1.contains(ch)) {
+          result++
+        }
+      }
+    }
+    return result
+  }
+
+  fun setInput(
+    input: MIDIInput?,
+    onMidiInput: (data: Uint8Array) -> Unit,
+) {
+    console.log("Setting input", input)
+    currentInput?.close()
+
+    currentInput = input
+
+    currentInput?.onstatechange = { message ->
+      console.log("State change:", message)
+    }
+
+    currentInput?.onmidimessage = { message ->
+      val data = message.data as Uint8Array
+      val hex = StringBuilder()
+      for (index in 0 until data.length) {
+        hex.append(data[index].toString(16))
+        hex.append(" ")
+      }
+      console.log("Midi message:", hex)
+
+      onMidiInput(message.data)
+    }
+
+    currentInput?.open()
+  }
+
+  fun setOutput(
+    output: MIDIOutput?
+  ) {
+    console.log("Setting output", output)
+    currentOutput?.close()
+
+    currentOutput = output
+
+    currentOutput?.open()
+  }
+
+  fun send(
+    data: Uint8Array,
+    timestamp: dynamic = null
+  ) {
+    currentOutput?.send(data, timestamp)
+  }
+
+}

src/jsMain/kotlin/nl/astraeus/vst/ui/components/KeyboardComponent.kt

@@ -6,8 +6,14 @@ import kotlinx.html.js.onMouseLeaveFunction
 import kotlinx.html.js.onMouseUpFunction
 import kotlinx.html.style
 import kotlinx.html.svg
+import nl.astraeus.css.properties.AlignItems
+import nl.astraeus.css.properties.Display
+import nl.astraeus.css.properties.FlexDirection
+import nl.astraeus.css.properties.FontWeight
+import nl.astraeus.css.properties.JustifyContent
 import nl.astraeus.css.properties.Position
 import nl.astraeus.css.properties.TextAlign
+import nl.astraeus.css.properties.prc
 import nl.astraeus.css.properties.px
 import nl.astraeus.css.properties.rem
 import nl.astraeus.css.style.cls
@@ -28,13 +34,26 @@ import org.w3c.dom.events.MouseEvent
  */
 class KeyboardComponent(
   val title: String = "Keyboard",
-  val octave: Int = 4,
+  initialOctave: Int = 4,
   val keyboardWidth: Int = 210,
   val keyboardHeight: Int = keyboardWidth / 2,
   val onNoteDown: (Int) -> Unit = {},
   val onNoteUp: (Int) -> Unit = {}
 ) : Komponent() {
 
+  // Current octave with range validation
+  private var _octave: Int = initialOctave
+  var octave: Int
+    get() = _octave
+    set(value) {
+      _octave = when {
+        value < 0 -> 0
+        value > 9 -> 9
+        else -> value
+      }
+      requestUpdate()
+    }
+
   // Set to track which notes are currently pressed
   private val pressedNotes = mutableSetOf<Int>()
 
@@ -87,14 +106,43 @@ class KeyboardComponent(
         }
       }
 
-      div(KeyboardTitleCls.name) {
-        // Show title of the keyboard
-        +title
-      }
+      div(KeyboardControlsCls.name) {
+        // Decrease octave button
+        div(OctaveButtonCls.name) {
+          style = "width: ${whiteKeyWidth}px"
+          +"<"
+          onMouseDownFunction = { event ->
+            if (event is MouseEvent) {
+              octave--
+              event.preventDefault()
+            }
+          }
+        }
 
-      div(KeyboardOctaveCls.name) {
-        // Show current octave the piano is being played at
-        +"Octave: $octave"
+        // Title and octave display container
+        div(KeyboardInfoCls.name) {
+          div(KeyboardTitleCls.name) {
+            // Show title of the keyboard
+            +title
+          }
+
+          div(KeyboardOctaveCls.name) {
+            // Show current octave the piano is being played at
+            +"Octave: $octave"
+          }
+        }
+
+        // Increase octave button
+        div(OctaveButtonCls.name) {
+          style = "width: ${whiteKeyWidth}px"
+          +">"
+          onMouseDownFunction = { event ->
+            if (event is MouseEvent) {
+              octave++
+              event.preventDefault()
+            }
+          }
+        }
       }
 
       div(KeyboardKeysCls.name) {
@@ -115,7 +163,7 @@ class KeyboardComponent(
                 var blackKeyPressed = false
                 for (j in 0 until 5) {
                   if (x >= blackKeyPositions[j] && x <= blackKeyPositions[j] + blackKeyWidth) {
-                    noteDown(blackKeys[j] + (octave - 4) * 12)
+                    noteDown(blackKeys[j] + (octave - 5) * 12)
                     blackKeyPressed = true
                     break
                   }
@@ -126,14 +174,14 @@ class KeyboardComponent(
                   // Check if click is on a white key
                   val keyIndex = (x / whiteKeyWidth).toInt()
                   if (keyIndex in 0..6) {
-                    noteDown(whiteKeys[keyIndex] + (octave - 4) * 12)
+                    noteDown(whiteKeys[keyIndex] + (octave - 5) * 12)
                   }
                 }
               } else {
                 // If y > blackKeyHeight, it's definitely a white key
                 val keyIndex = (x / whiteKeyWidth).toInt()
                 if (keyIndex in 0..6) {
-                  noteDown(whiteKeys[keyIndex] + (octave - 4) * 12)
+                  noteDown(whiteKeys[keyIndex] + (octave - 5) * 12)
                 }
               }
 
@@ -151,7 +199,7 @@ class KeyboardComponent(
                 var blackKeyReleased = false
                 for (j in 0 until 5) {
                   if (x >= blackKeyPositions[j] && x <= blackKeyPositions[j] + blackKeyWidth) {
-                    noteUp(blackKeys[j] + (octave - 4) * 12)
+                    noteUp(blackKeys[j] + (octave - 5) * 12)
                     blackKeyReleased = true
                     break
                   }
@@ -162,14 +210,14 @@ class KeyboardComponent(
                   // Check if release is on a white key
                   val keyIndex = (x / whiteKeyWidth).toInt()
                   if (keyIndex in 0..6) {
-                    noteUp(whiteKeys[keyIndex] + (octave - 4) * 12)
+                    noteUp(whiteKeys[keyIndex] + (octave - 5) * 12)
                   }
                 }
               } else {
                 // If y > blackKeyHeight, it's definitely a white key
                 val keyIndex = (x / whiteKeyWidth).toInt()
                 if (keyIndex in 0..6) {
-                  noteUp(whiteKeys[keyIndex] + (octave - 4) * 12)
+                  noteUp(whiteKeys[keyIndex] + (octave - 5) * 12)
                 }
               }
 
@@ -207,9 +255,12 @@ class KeyboardComponent(
 
   companion object : CssId("keyboard") {
     object KeyboardCls : CssName()
+    object KeyboardControlsCls : CssName()
+    object KeyboardInfoCls : CssName()
     object KeyboardTitleCls : CssName()
     object KeyboardOctaveCls : CssName()
     object KeyboardKeysCls : CssName()
+    object OctaveButtonCls : CssName()
     object WhiteKeyCls : CssName()
     object BlackKeyCls : CssName()
 
@@ -219,31 +270,57 @@ class KeyboardComponent(
           position(Position.relative)
           margin(5.px)
 
+          select(cls(KeyboardControlsCls)) {
+            position(Position.relative)
+            display(Display.flex)
+            flexDirection(FlexDirection.row)
+            justifyContent(JustifyContent.spaceBetween)
+            alignItems(AlignItems.center)
+            width(100.prc)
+            height(50.px)
+            marginBottom(10.px)
+          }
+
+          select(cls(KeyboardInfoCls)) {
+            display(Display.flex)
+            flexDirection(FlexDirection.column)
+            alignItems(AlignItems.center)
+            justifyContent(JustifyContent.center)
+            flex("1")
+          }
+
           select(cls(KeyboardTitleCls)) {
-            position(Position.absolute)
-            width(100.px)
             textAlign(TextAlign.center)
             fontSize(1.2.rem)
             color(Css.currentStyle.mainFontColor)
-            top(5.px)
-            left(0.px)
-            right(0.px)
           }
 
           select(cls(KeyboardOctaveCls)) {
-            position(Position.absolute)
-            width(100.px)
             textAlign(TextAlign.center)
             fontSize(1.0.rem)
             color(Css.currentStyle.mainFontColor)
-            top(30.px)
-            left(0.px)
-            right(0.px)
+            marginTop(5.px)
+          }
+
+          select(cls(OctaveButtonCls)) {
+            height(50.px)
+            plain("background-color", Css.currentStyle.buttonBackgroundColor.toString())
+            color(Css.currentStyle.mainFontColor)
+            border("1px solid ${Css.currentStyle.buttonBorderColor}")
+            textAlign(TextAlign.center)
+            lineHeight(50.px)
+            fontSize(1.5.rem)
+            fontWeight(FontWeight.bold)
+            cursor("pointer")
+            plain("-webkit-touch-callout", "none")
+            plain("-webkit-user-select", "none")
+            plain("-moz-user-select", "none")
+            plain("-ms-user-select", "none")
+            plain("user-select", "none")
           }
 
           select(cls(KeyboardKeysCls)) {
-            position(Position.absolute)
-            top(60.px)
+            position(Position.relative)
           }
         }