Initial commit

.gitignore

@@ -0,0 +1,4 @@
+.gradle
+.idea
+build
+kotlin-js-store

build.gradle.kts

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+import org.jetbrains.kotlin.gradle.targets.js.webpack.KotlinWebpackOutput.Target.VAR
+import org.jetbrains.kotlin.gradle.plugin.KotlinJsCompilerType.LEGACY
+import org.jetbrains.kotlin.gradle.plugin.KotlinJsCompilerType.IR
+
+plugins {
+    kotlin("multiplatform") version "1.7.20"
+    application
+}
+
+group = "nl.astraeus"
+version = "1.0-SNAPSHOT"
+
+repositories {
+    mavenCentral()
+    maven("https://maven.pkg.jetbrains.space/public/p/kotlinx-html/maven")
+}
+
+val jsMode = IR
+
+kotlin {
+    jvm {
+        compilations.all {
+            kotlinOptions.jvmTarget = "1.8"
+        }
+        withJava()
+        testRuns["test"].executionTask.configure {
+            useJUnitPlatform()
+        }
+    }
+    js(jsMode) {
+        binaries.executable()
+        browser()
+    }
+    js("jsAudioWorklet", jsMode) {
+        binaries.executable()
+
+        browser {
+            commonWebpackConfig {
+                outputFileName = "audio-worklet.js"
+            }
+
+            webpackTask {
+                output.libraryTarget = VAR
+                // set library name, so we can call kotlin generated code from javascript
+                output.library = "audioWorklet"
+            }
+        }
+    }
+    sourceSets {
+        val commonMain by getting
+        val jvmMain by getting {
+            dependencies {
+                implementation("io.ktor:ktor-server-netty:2.0.2")
+                implementation("io.ktor:ktor-server-html-builder-jvm:2.0.2")
+                implementation("org.jetbrains.kotlinx:kotlinx-html-jvm:0.7.2")
+            }
+        }
+        val jsMain by getting
+        val jsAudioWorkletMain by getting
+    }
+}
+
+application {
+    mainClass.set("nl.astraeus.application.ServerKt")
+}
+
+tasks.named<Copy>("jvmProcessResources") {
+    val jsBrowserDistribution = tasks.named("jsBrowserDistribution")
+    from(jsBrowserDistribution)
+    from(tasks.named("jsAudioWorkletBrowserDistribution"))
+}
+
+tasks.named<JavaExec>("run") {
+    dependsOn(tasks.named<Jar>("jvmJar"))
+    classpath(tasks.named<Jar>("jvmJar"))
+}

gradle.properties

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+kotlin.code.style=official
+kotlin.js.compiler=ir

gradle/wrapper/gradle-wrapper.properties

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.4.2-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

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+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

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+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle.kts

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+
+rootProject.name = "kotlin-audioworklet"
+

src/jsAudioWorkletMain/kotlin/nl/astraeus/processor/WorkletProcessor.kt

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+@file:OptIn(ExperimentalJsExport::class)
+
+package nl.astraeus.processor
+
+import org.khronos.webgl.Float64Array
+import org.w3c.dom.MessageEvent
+import org.w3c.dom.MessagePort
+
+@ExperimentalJsExport
+@JsExport
+object WorkletProcessor {
+  var port: MessagePort? = null
+
+  @JsName("setPort")
+  fun setPort(port: MessagePort) {
+    this.port = port
+    this.port?.onmessage = ::onMessage
+  }
+
+  @JsName("onMessage")
+  fun onMessage(message: MessageEvent) {
+    console.log("WorkletProcessor: Received message", message)
+
+    when (message.data) {
+      "start" -> {
+        println("Start worklet!")
+      }
+      "stop" -> {
+
+      }
+      else ->
+        console.error("Don't kow how to handle message", message)
+    }
+  }
+
+  @JsName("process")
+  fun process(samples: Int, left: Float64Array, right: Float64Array) {
+    //console.log("WorkletProcessor.process", samples)
+//    val buffer = Float64SampleBuffer(samples, left, right)
+//
+//    audioGenerator?.also { generator ->
+//      generator.fillBuffer(buffer, 0, samples, false)
+//    }
+  }
+
+}

src/jsAudioWorkletMain/resources/worklet-processor.js

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+; // make sure kotlin js code last statement is ended
+
+class WorkletProcessor extends AudioWorkletProcessor {
+
+    // Static getter to define AudioParam objects in this custom processor.
+    static get parameterDescriptors() {
+        return [{
+            name: 'volume',
+            defaultValue: 0.75
+        }];
+    }
+
+    constructor() {
+        super();
+
+        console.log("worklet-processor.constructor", this, audioWorklet);
+
+        audioWorklet.nl.astraeus.processor.WorkletProcessor.setPort(this.port);
+
+        console.log("STARTED worklet-processor.js");
+    }
+
+    process(inputs, outputs, parameters) {
+        let result = true;
+        let samplesToProcess = 0;
+
+        if (outputs.length !== 1) {
+            result = false;
+            console.log("Unexpected number of outputs!", outputs)
+        } else {
+            let channels = outputs[0].length;
+
+            if (channels !== 2) {
+                result = false;
+                console.log("Unexpected number of channels!", outputs[0]);
+            } else if (outputs[0][0].length !== outputs[0][1].length) {
+                result = false;
+                console.log("Channels have different lengths!!", outputs[0]);
+            } else {
+                samplesToProcess = outputs[0][0].length;
+
+                audioWorklet.nl.astraeus.processor.WorkletProcessor.process(
+                    samplesToProcess,
+                    outputs[0][0],
+                    outputs[0][1]
+                );
+            }
+        }
+
+        return result;
+    }
+}
+
+registerProcessor('worklet-processor', WorkletProcessor);

src/jsMain/kotlin/nl/astraeus/Main.kt

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+package nl.astraeus
+
+import kotlinx.browser.document
+import nl.astraeus.handler.AudioWorkletHandler
+
+fun main() {
+  AudioWorkletHandler.loadCode()
+
+  println("Ok")
+
+  document.getElementById("clicker")?.also {
+    it.addEventListener("click", {
+      AudioWorkletHandler.createContext {
+        println("Created context")
+
+        AudioWorkletHandler.start()
+      }
+    }, "")
+  }
+
+}

src/jsMain/kotlin/nl/astraeus/handler/AudioWorkletHandler.kt

@@ -0,0 +1,162 @@
+package nl.astraeus.handler
+
+import kotlinx.browser.window
+import org.w3c.dom.MessageEvent
+import org.w3c.dom.MessagePort
+import org.w3c.dom.url.URL
+import org.w3c.files.Blob
+import org.w3c.files.FilePropertyBag
+
+enum class WorkletState {
+  INIT,
+  LOADING,
+  LOADED,
+  READY
+}
+
+abstract class AudioWorklet(
+  val jsCodeFile: String,
+  val kotlinCodeFile: String
+) {
+  var audioContext: dynamic = null
+  var state = WorkletState.INIT
+  var processingCode: Blob? = null
+  var sampleRate: Int = 44100
+  var audioWorkletMessagePort: MessagePort? = null
+
+  abstract fun createNode(audioContext: dynamic): dynamic
+
+  abstract fun onAudioWorkletMessage(message: MessageEvent)
+
+  abstract fun onCodeLoaded()
+
+  fun loadCode() {
+    // hack
+    // concat kotlin js and note-processor.js because
+    // audio worklet es6 is not supported in kotlin yet
+    state = WorkletState.LOADING
+
+    window.fetch(jsCodeFile).then { daResponse ->
+      if (daResponse.ok) {
+        daResponse.text().then { daText ->
+          window.fetch(kotlinCodeFile).then { npResponse ->
+            if (npResponse.ok) {
+              npResponse.text().then { npText ->
+                processingCode = Blob(
+                  arrayOf(daText, npText),
+                  FilePropertyBag(type = "application/javascript")
+                )
+
+                state = WorkletState.LOADED
+
+                println("Loaded $this code")
+
+                onCodeLoaded()
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+
+  fun createContext(callback: () -> Unit) {
+    js("window.AudioContext = window.AudioContext || window.webkitAudioContext")
+
+    audioContext = js("new window.AudioContext()")
+    sampleRate = audioContext.sampleRate as Int
+
+    check(state == WorkletState.LOADED) {
+      "Can not createContext when code is not yet loaded, call loadCode first"
+    }
+
+    val module = audioContext.audioWorklet.addModule(
+      URL.createObjectURL(processingCode!!)
+    )
+
+    module.then {
+      val node: dynamic = createNode(audioContext)
+
+      node.connect(audioContext.destination)
+
+      node.port.onmessage = ::onAudioWorkletMessage
+
+      audioWorkletMessagePort = node.port as? MessagePort
+
+      state = WorkletState.READY
+
+      //postBatchedRequests()
+
+      callback()
+
+      "dynamic"
+    }
+  }
+
+  fun isResumed(): Boolean = audioContext?.state == "running"
+
+  fun resume() {
+    check(state == WorkletState.READY) {
+      "Unable to resume, state is not READY [$state]"
+    }
+
+    audioContext?.resume()
+  }
+
+/*  fun postRequest(request: WorkerRequest) {
+    batchedRequests.add(request)
+
+    postBatchedRequests()
+  }
+
+  private fun postBatchedRequests() {
+    val port = audioWorkletMessagePort
+
+    if (port != null) {
+      for (request in batchedRequests) {
+        val message = when (serializer) {
+          is StringFormat -> {
+            serializer.encodeToString(WorkerRequest.serializer(), request)
+          }
+
+          is BinaryFormat -> {
+            serializer.encodeToByteArray(WorkerRequest.serializer(), request)
+          }
+
+          else -> {
+            error("Unknown serializer format ${serializer::class.simpleName}")
+          }
+        }
+
+        port.postMessage(message)
+      }
+
+      batchedRequests.clear()
+    }
+  }*/
+}
+
+object AudioWorkletHandler : AudioWorklet(
+  "static/worklet-processor.js",
+  "static/audio-worklet.js"
+) {
+
+  override fun createNode(audioContext: dynamic): dynamic = js(
+    // worklet-processor as defined in de javascript:
+    // registerProcessor('worklet-processor', WorkletProcessor);
+  "new AudioWorkletNode(audioContext, 'worklet-processor', { numberOfInputs: 0, outputChannelCount: [2] })"
+  )
+
+  override fun onAudioWorkletMessage(message: MessageEvent) {
+    console.log("Received message from audio worklet: ", message)
+  }
+
+  override fun onCodeLoaded() {
+    println("Audio worklet code is loaded.")
+  }
+
+  fun start() {
+    audioWorkletMessagePort?.postMessage("start")
+  }
+
+}

src/jsMain/resources/worklet.css

@@ -0,0 +1,4 @@
+.button {
+    padding: 3px 5px;
+    background-color: red;
+}

src/jvmMain/kotlin/nl.astraeus.application/Server.kt

@@ -0,0 +1,44 @@
+package nl.astraeus.application
+
+import io.ktor.http.HttpStatusCode
+import io.ktor.server.application.*
+import io.ktor.server.engine.embeddedServer
+import io.ktor.server.html.*
+import io.ktor.server.http.content.*
+import io.ktor.server.netty.Netty
+import io.ktor.server.routing.*
+import kotlinx.html.*
+
+fun HTML.index() {
+  head {
+    title("Hello from Ktor!")
+    link("static/worklet.css", "stylesheet" ,"text/css")
+  }
+  body {
+    div {
+      +"Hello from Ktor"
+    }
+    div {
+      id = "root"
+    }
+    span("button") {
+      id = "clicker"
+
+      + "Start"
+    }
+    script(src = "/static/kotlin-audioworklet.js") {}
+  }
+}
+
+fun main() {
+  embeddedServer(Netty, port = 8080, host = "127.0.0.1") {
+    routing {
+      get("/") {
+        call.respondHtml(HttpStatusCode.OK, HTML::index)
+      }
+      static("/static") {
+        resources()
+      }
+    }
+  }.start(wait = true)
+}