first commit

.gitignore

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+/.gradle
+/.idea
+/out
+build/
+*.iml
+*.ipr
+*.iws
+.classpath
+.project
+.settings/
+bin/

audio-automation/build.gradle

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+apply plugin: 'kotlin'
+
+group 'me.jfenn'
+version '0.0.1'
+
+sourceSets {
+    main.kotlin.srcDirs = main.java.srcDirs = ['src']
+    test.kotlin.srcDirs = test.java.srcDirs = ['test']
+    main.resources.srcDirs = ['resources']
+    test.resources.srcDirs = ['testresources']
+}
+
+dependencies {
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutines_version"
+}

audio-automation/src/me/jfenn/audio/AudioManager.kt

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+package me.jfenn.audio
+
+import me.jfenn.audio.impl.JavaxMidiInterface
+import javax.sound.midi.*
+import kotlinx.coroutines.*
+import kotlinx.coroutines.flow.*
+import me.jfenn.audio.model.Note
+
+class AudioManager(
+    val scope: CoroutineScope = GlobalScope
+) {
+
+    val midi = JavaxMidiInterface()
+
+    suspend fun start(block: suspend AudioManager.() -> Unit) {
+        block()
+    }
+
+    fun metronome(interval: Long) : Flow<Int> = flow {
+        var i = 0
+        while (true) {
+            delay(interval)
+            emit(i++)
+        }
+    }
+
+    fun <T> Flow<T>.every(vararg count: Int, offset: Int = 0) : Flow<T> {
+        var i = 0
+        var wait = 1 + offset
+        return transform { value ->
+            if (--wait == 0) {
+                i = (i+1) % count.size
+                wait = count[i]
+                emit(value)
+            }
+        }
+    }
+
+    fun Flow<Note>.output() {
+        scope.launch {
+            collect {
+               launch {
+                   delay(it.delay)
+                   midi.noteOn(it.instrument, it.number, it.velocity)
+                   delay(it.duration)
+                   midi.noteOff(it.instrument, it.number)
+               }
+            }
+        }
+    }
+
+    fun destroy() {
+        midi.destroy()
+    }
+
+}

audio-automation/src/me/jfenn/audio/Main.kt

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+package me.jfenn.audio
+
+import kotlinx.coroutines.flow.transform
+import kotlinx.coroutines.runBlocking
+import me.jfenn.audio.constants.*
+import me.jfenn.audio.model.Note
+
+fun main() = runBlocking<Unit> {
+    println("Hello world!")
+
+    AudioManager(scope = this).start {
+        val metro = metronome(500)
+
+        metro.transform {
+            emit(Note(HARPSICHORD, arrayOf(40, 47, 52, 59).random(), 250))
+        }.transform { note ->
+            emit(note)
+            emit(Note(HARPSICHORD, note.number + 5, 250, delay = 250))
+            emit(Note(HARPSICHORD, note.number + 9, 250, delay = 500))
+        }.transform { note ->
+            emit(note.copy(velocity = 80))
+        }.output()
+
+        metro.every(8).transform {
+            emit(Note(50, 68, 3000))
+            emit(Note(50, 59, 3100))
+            emit(Note(50, arrayOf(49, 51, 52).random(), 3200))
+        }.output()
+
+        metro.every(4).transform {
+            emit(Note(VIBRAPHONE, 28, 1500, 100))
+        }.output()
+
+        metro.every(2, offset = 1).transform {
+            emit(Note(128, 44, 100))
+        }.output()
+    }
+}

audio-automation/src/me/jfenn/audio/constants/Channels.kt

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+package me.jfenn.audio.constants
+
+const val ACOUSTIC_GRAND_PIANO = 1
+const val BRIGHT_ACOUSTIC_PIANO = 2
+const val ELECTRIC_GRAND_PIANO = 3
+const val HONKY_TONK_PIANO = 4
+const val ELECTRIC_PIANO_1 = 5
+const val ELECTRIC_PIANO_2 = 6
+const val HARPSICHORD = 7
+const val CLAVI = 8
+
+const val CELESTA = 9
+const val GLOCKENSPIEL = 10
+const val MUSIC_BOX = 11
+const val VIBRAPHONE = 11
+
+const val ACOUSTIC_BASS = 33
+
+const val SYNTH_DRUM = 119

audio-automation/src/me/jfenn/audio/impl/JavaxMidiInterface.kt

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+package me.jfenn.audio.impl
+
+import kotlinx.coroutines.delay
+import javax.sound.midi.MidiSystem
+
+const val MIDI_DELAY = 500L
+
+class JavaxMidiInterface() {
+
+    val synth = MidiSystem.getSynthesizer().apply { open() }
+
+    val instrumentMap = HashMap<Int, Int>()
+    val noteMap = HashMap<Int, Int>()
+    val usageMap = HashMap<Int, Int>()
+
+    suspend fun noteOn(instrument: Int, number: Int, velocity: Int) {
+        for (channel in (0..15)) if (instrumentMap[channel]?.equals(instrument) != false) {
+            // map channel to instrument
+            instrumentMap[channel] = instrument
+            // add one usage to channel
+            usageMap[channel] = (usageMap[channel] ?: 0) + 1
+            // add one usage to note
+            val noteId = (number * 16) + channel
+            noteMap[noteId] = (noteMap[noteId] ?: 0) + 1
+
+            // play the note
+            synth.channels[channel].apply {
+                if (program != instrument)
+                    programChange(instrument)
+
+                delay(MIDI_DELAY)
+                noteOn(number, velocity)
+            }
+
+            break
+        }
+    }
+
+    suspend fun noteOff(instrument: Int, number: Int) {
+        for (channel in (0..15)) if (instrumentMap[channel] == instrument) {
+            // subtract one from channel usage
+            usageMap[channel] = (usageMap[channel] ?: 1) - 1
+            // if usage == 0, un-map channel
+            if (usageMap[channel] == 0) instrumentMap.remove(channel)
+            // subtract one from note usage
+            val noteId = (number * 16) + channel
+            noteMap[noteId] = (noteMap[noteId] ?: 1) - 1
+
+            // release the note
+            if (noteMap[noteId] == 0) {
+                //delay(MIDI_DELAY)
+                synth.channels[channel].noteOff(number)
+            }
+
+            break
+        }
+    }
+
+    fun destroy() {
+        synth.close()
+    }
+
+}

audio-automation/src/me/jfenn/audio/model/Note.kt

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+package me.jfenn.audio.model
+
+data class Note(
+    val instrument: Int,
+    val number: Int,
+    val duration: Long,
+    val velocity: Int = 90,
+    val delay: Long = 0
+)

build.gradle

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+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+buildscript {
+    ext.kotlin_version = '1.4.0'
+    ext.coroutines_version = '1.4.2'
+    ext.serialization_version = '0.20.0'
+
+    repositories {
+        google()
+        jcenter()
+        maven { url "https://kotlin.bintray.com/kotlinx" }
+        maven { url "https://plugins.gradle.org/m2/" }
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:4.0.0'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+        classpath "org.jetbrains.kotlin:kotlin-serialization:$kotlin_version"
+
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+        mavenCentral()
+    }
+}

example/build.gradle

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+apply plugin: 'kotlin'
+apply plugin: 'application'
+
+group 'me.jfenn'
+version '0.0.1'
+
+sourceSets {
+    main.kotlin.srcDirs = main.java.srcDirs = ['src']
+    test.kotlin.srcDirs = test.java.srcDirs = ['test']
+    main.resources.srcDirs = ['resources']
+    test.resources.srcDirs = ['testresources']
+}
+
+dependencies {
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
+
+    implementation project(':audio-automation')
+}

example/resources/application.conf

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+ktor {
+    deployment {
+        port = 8080
+        port = ${?PORT}
+    }
+    application {
+        modules = [ me.jfenn.ApplicationKt.module ]
+    }
+}

example/resources/logback.xml

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+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{YYYY-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+        </encoder>
+    </appender>
+    <root level="trace">
+        <appender-ref ref="STDOUT"/>
+    </root>
+    <logger name="org.eclipse.jetty" level="INFO"/>
+    <logger name="io.netty" level="INFO"/>
+</configuration>

example/src/Application.kt

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+package me.jfenn
+
+fun main(args: Array<String>) : Unit {
+    println("Hello world!")
+}
+

gradle.properties

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+ktor_version=1.3.2
+kotlin.code.style=official
+kotlin_version=1.3.72
+logback_version=1.2.1

gradle/wrapper/gradle-wrapper.properties

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.2-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

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+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or 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 UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$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" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,100 @@
+@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 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 init
+
+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 init
+
+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
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+: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 %CMD_LINE_ARGS%
+
+: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

@@ -0,0 +1,4 @@
+rootProject.name = "audio-automation"
+enableFeaturePreview('GRADLE_METADATA')
+include ':audio-automation'
+include ':example'