commit fca2ca7dc1e1fe57b6cc5c4dfc4d1f7d472407a6 Author: Anton Lydike Date: Sat Jan 21 12:38:35 2023 +0000 initial commit diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..702f2d7 --- /dev/null +++ b/.gitignore @@ -0,0 +1,170 @@ +# Created by https://www.toptal.com/developers/gitignore/api/kotlin,gradle,intellij +# Edit at https://www.toptal.com/developers/gitignore?templates=kotlin,gradle,intellij + +### Intellij ### +# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider +# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839 + +# User-specific stuff +.idea/**/workspace.xml +.idea/**/tasks.xml +.idea/**/usage.statistics.xml +.idea/**/dictionaries +.idea/**/shelf + +# AWS User-specific +.idea/**/aws.xml + +# Generated files +.idea/**/contentModel.xml + +# Sensitive or high-churn files +.idea/**/dataSources/ +.idea/**/dataSources.ids +.idea/**/dataSources.local.xml +.idea/**/sqlDataSources.xml +.idea/**/dynamic.xml +.idea/**/uiDesigner.xml +.idea/**/dbnavigator.xml + +# Gradle +.idea/**/gradle.xml +.idea/**/libraries + +# Gradle and Maven with auto-import +# When using Gradle or Maven with auto-import, you should exclude module files, +# since they will be recreated, and may cause churn. Uncomment if using +# auto-import. +# .idea/artifacts +# .idea/compiler.xml +# .idea/jarRepositories.xml +# .idea/modules.xml +# .idea/*.iml +# .idea/modules +# *.iml +# *.ipr + +# CMake +cmake-build-*/ + +# Mongo Explorer plugin +.idea/**/mongoSettings.xml + +# File-based project format +*.iws + +# IntelliJ +out/ + +# mpeltonen/sbt-idea plugin +.idea_modules/ + +# JIRA plugin +atlassian-ide-plugin.xml + +# Cursive Clojure plugin +.idea/replstate.xml + +# SonarLint plugin +.idea/sonarlint/ + +# Crashlytics plugin (for Android Studio and IntelliJ) +com_crashlytics_export_strings.xml +crashlytics.properties +crashlytics-build.properties +fabric.properties + +# Editor-based Rest Client +.idea/httpRequests + +# Android studio 3.1+ serialized cache file +.idea/caches/build_file_checksums.ser + +### Intellij Patch ### +# Comment Reason: https://github.com/joeblau/gitignore.io/issues/186#issuecomment-215987721 + +# *.iml +# modules.xml +# .idea/misc.xml +# *.ipr + +# Sonarlint plugin +# https://plugins.jetbrains.com/plugin/7973-sonarlint +.idea/**/sonarlint/ + +# SonarQube Plugin +# https://plugins.jetbrains.com/plugin/7238-sonarqube-community-plugin +.idea/**/sonarIssues.xml + +# Markdown Navigator plugin +# https://plugins.jetbrains.com/plugin/7896-markdown-navigator-enhanced +.idea/**/markdown-navigator.xml +.idea/**/markdown-navigator-enh.xml +.idea/**/markdown-navigator/ + +# Cache file creation bug +# See https://youtrack.jetbrains.com/issue/JBR-2257 +.idea/$CACHE_FILE$ + +# CodeStream plugin +# https://plugins.jetbrains.com/plugin/12206-codestream +.idea/codestream.xml + +# Azure Toolkit for IntelliJ plugin +# https://plugins.jetbrains.com/plugin/8053-azure-toolkit-for-intellij +.idea/**/azureSettings.xml + +### Kotlin ### +# Compiled class file +*.class + +# Log file +*.log + +# BlueJ files +*.ctxt + +# Mobile Tools for Java (J2ME) +.mtj.tmp/ + +# Package Files # +*.jar +*.war +*.nar +*.ear +*.zip +*.tar.gz +*.rar + +# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml +hs_err_pid* +replay_pid* + +### Gradle ### +.gradle +**/build/ +!src/**/build/ + +# Ignore Gradle GUI config +gradle-app.setting + +# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored) +!gradle-wrapper.jar + +# Avoid ignore Gradle wrappper properties +!gradle-wrapper.properties + +# Cache of project +.gradletasknamecache + +# Eclipse Gradle plugin generated files +# Eclipse Core +.project +# JDT-specific (Eclipse Java Development Tools) +.classpath + +### Gradle Patch ### +# Java heap dump +*.hprof + +# End of https://www.toptal.com/developers/gitignore/api/kotlin,gradle,intellij diff --git a/.idea/.gitignore b/.idea/.gitignore new file mode 100644 index 0000000..13566b8 --- /dev/null +++ b/.idea/.gitignore @@ -0,0 +1,8 @@ +# Default ignored files +/shelf/ +/workspace.xml +# Editor-based HTTP Client requests +/httpRequests/ +# Datasource local storage ignored files +/dataSources/ +/dataSources.local.xml diff --git a/.idea/compiler.xml b/.idea/compiler.xml new file mode 100644 index 0000000..fb7f4a8 --- /dev/null +++ b/.idea/compiler.xml @@ -0,0 +1,6 @@ + + + + + + \ No newline at end of file diff --git a/.idea/jarRepositories.xml b/.idea/jarRepositories.xml new file mode 100644 index 0000000..fdc392f --- /dev/null +++ b/.idea/jarRepositories.xml @@ -0,0 +1,20 @@ + + + + + + + + + + + \ No newline at end of file diff --git a/.idea/kotlinc.xml b/.idea/kotlinc.xml new file mode 100644 index 0000000..b1077fb --- /dev/null +++ b/.idea/kotlinc.xml @@ -0,0 +1,6 @@ + + + + + \ No newline at end of file diff --git a/.idea/misc.xml b/.idea/misc.xml new file mode 100644 index 0000000..5d98256 --- /dev/null +++ b/.idea/misc.xml @@ -0,0 +1,10 @@ + + + + + + + + + + \ No newline at end of file diff --git a/.idea/vcs.xml b/.idea/vcs.xml new file mode 100644 index 0000000..94a25f7 --- /dev/null +++ b/.idea/vcs.xml @@ -0,0 +1,6 @@ + + + + + + \ No newline at end of file diff --git a/build.gradle.kts b/build.gradle.kts new file mode 100644 index 0000000..cff1f50 --- /dev/null +++ b/build.gradle.kts @@ -0,0 +1,29 @@ +import org.jetbrains.kotlin.gradle.tasks.KotlinCompile + +plugins { + kotlin("jvm") version "1.7.10" + application +} + +group = "org.example" +version = "1.0-SNAPSHOT" + +repositories { + mavenCentral() +} + +dependencies { + testImplementation(kotlin("test")) +} + +tasks.test { + useJUnitPlatform() +} + +tasks.withType { + kotlinOptions.jvmTarget = "1.8" +} + +application { + mainClass.set("MainKt") +} \ No newline at end of file diff --git a/gradle.properties b/gradle.properties new file mode 100644 index 0000000..7fc6f1f --- /dev/null +++ b/gradle.properties @@ -0,0 +1 @@ +kotlin.code.style=official diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar new file mode 100644 index 0000000..249e583 Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties new file mode 100644 index 0000000..60c76b3 --- /dev/null +++ b/gradle/wrapper/gradle-wrapper.properties @@ -0,0 +1,5 @@ +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 \ No newline at end of file diff --git a/gradlew b/gradlew new file mode 100755 index 0000000..1b6c787 --- /dev/null +++ b/gradlew @@ -0,0 +1,234 @@ +#!/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 "$JAVACMD" "$@" diff --git a/gradlew.bat b/gradlew.bat new file mode 100644 index 0000000..ac1b06f --- /dev/null +++ b/gradlew.bat @@ -0,0 +1,89 @@ +@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 diff --git a/settings.gradle.kts b/settings.gradle.kts new file mode 100644 index 0000000..287fa91 --- /dev/null +++ b/settings.gradle.kts @@ -0,0 +1,3 @@ + +rootProject.name = "procedural-musix" + diff --git a/src/main/kotlin/AudioSink.kt b/src/main/kotlin/AudioSink.kt new file mode 100644 index 0000000..c3165c6 --- /dev/null +++ b/src/main/kotlin/AudioSink.kt @@ -0,0 +1,63 @@ +import java.util.concurrent.BlockingQueue +import java.util.concurrent.LinkedBlockingQueue +import javax.sound.sampled.AudioFormat +import javax.sound.sampled.AudioSystem +import javax.sound.sampled.DataLine +import javax.sound.sampled.SourceDataLine + +class AudioChunk(val tick: Int, val samples: SoundSamples) { + fun toBytes(): ByteArray = ByteArray(samples.size * 2) { + i -> ((samples[i/2] * Params.MAX_VAL).toInt() shr ((i % 2) * 8)).toByte() + } +} + +class AudioSink : Thread() { + private val chunks: BlockingQueue = LinkedBlockingQueue(); + + val queueSize: Int + get() = chunks.size + + fun enqueueChunk(chunk: AudioChunk) { + chunks.add(chunk.toBytes()) + } + + var running : Boolean = false + private set + + override fun run() { + val format = AudioFormat(Params.SAMPLES, 16, 1, true, false) + val info = DataLine.Info(SourceDataLine::class.java, format) + val line = AudioSystem.getLine(info) as SourceDataLine + + line.open(format) + line.start() + + while (true) { + if (chunks.isEmpty()) { + if (!running) + break + System.err.println("Empty chunks queue! Work faster!") + } + + val next = chunks.take() + + line.write(next, 0, next.size) + } + + line.close() + } + + fun terminate(empty_queue: Boolean = false) { + if (empty_queue) { + chunks.clear() + } + running = false + join() + } + + override fun start() { + running = true + super.start() + } + +} \ No newline at end of file diff --git a/src/main/kotlin/Main.kt b/src/main/kotlin/Main.kt new file mode 100644 index 0000000..047ec45 --- /dev/null +++ b/src/main/kotlin/Main.kt @@ -0,0 +1,61 @@ +import Params.PI +import Params.TWO_PI +import Params.as_samples +import filter.Compressor +import filter.Limiter +import kotlin.math.cos +import kotlin.math.pow +import kotlin.math.sin + + +object Params { + const val SAMPLES = 44100f + const val PI = kotlin.math.PI.toFloat() + const val TWO_PI = 2f * kotlin.math.PI.toFloat() + val MAX_VAL = (2.toDouble().pow(15)-1).toInt() + val CORES = Runtime.getRuntime().availableProcessors() + + fun as_samples(seconds: Float): Float = SAMPLES * seconds +} + +private const val F0: Float = 440f; +fun toFrequency(tone: Float): Float = F0 * 2f.pow(tone / 12f) + + + +abstract class StepGenerator { + abstract fun generateSingle(time: Float): Float + + open fun generate(time: TimeSignal): SoundSamples = SoundSamples(time.size) { i -> generateSingle(time[i]) } +} + +class SineWaveGenerator(var tone: Float) : StepGenerator() { + override fun generateSingle(time: Float): Float { + return sin(time * toFrequency(tone) * TWO_PI) + } +} + + + +fun main(args: Array) { + val sink = AudioSink() + + + val gen = SoundMachine() + + gen.globalEffects.add(Compressor(as_samples(.4f).toInt())::apply) + gen.globalEffects.add(Limiter(.9f)::apply) + + gen.generators.add(Chain(SineWaveGenerator(0f)::generate, ArrayList())) + + sink.enqueueChunk(gen.nextChunk()) + + sink.start() + + for (i in 1..100) { + sink.enqueueChunk(gen.nextChunk()) + } + + sink.terminate() +} + diff --git a/src/main/kotlin/SoundMachine.kt b/src/main/kotlin/SoundMachine.kt new file mode 100644 index 0000000..c6cb20b --- /dev/null +++ b/src/main/kotlin/SoundMachine.kt @@ -0,0 +1,57 @@ +import SoundMachine.State.last_time + +typealias TimeSignal = FloatArray + +typealias SoundSamples = FloatArray +// SoundSamples represent samples from a wave, sampled Params.SAMPLES times per second. + +typealias Generator = (TimeSignal) -> SoundSamples + +typealias Effect = (SoundSamples) -> SoundSamples + +class Chain( + val generator: Generator, + val effects: List +) { + fun apply(signal: TimeSignal): SoundSamples = effects.fold(generator(signal)) { acc, effect -> effect(acc) } +} + + +fun SoundSamples.combine(sample: SoundSamples) : SoundSamples{ + return SoundSamples(sample.size) { i -> this[i] + sample[i]} +} + +class SoundMachine() { + object State { + var tick : Int = 0 + // the current tick we're on. One tick = one beat + var bpm : Float = 64f + var last_time: Float = 0f + // the current speed (bpm) + } + + val generators : MutableList = ArrayList() + + val globalEffects: MutableList = ArrayList() + + fun nextChunk() : AudioChunk { + // let's generate the next beat! + // grab current tick + val tick = State.tick++ + // compute samples per beat (since bpm is variable, recompute every beat) + // TODO optimization opportunity + val secondsPerBeat = 60 / State.bpm + val samplesPerBeat = secondsPerBeat * Params.SAMPLES; + + val base : TimeSignal = TimeSignal(samplesPerBeat.toInt()) { i -> (i / Params.SAMPLES) + last_time } + + last_time += secondsPerBeat + + val result = generators.map { gen -> gen.apply(base) } .reduce { acc, sample -> acc.combine(sample) } + + return AudioChunk( + tick, + globalEffects.fold(result) { acc, effect -> effect(acc) } + ) + } +} \ No newline at end of file diff --git a/src/main/kotlin/filter/EchoFilter.kt b/src/main/kotlin/filter/EchoFilter.kt new file mode 100644 index 0000000..a35bc9b --- /dev/null +++ b/src/main/kotlin/filter/EchoFilter.kt @@ -0,0 +1,24 @@ +package filter +import java.lang.Float.max +import java.lang.Float.min +import java.util.* + +fun clamp(min_val: Float, value: Float, max_val: Float) : Float{ + return max(min(value, max_val), min_val) +} + +class EchoFilter(size: Int, private val volume: Float = 0.5f) : StepFilter() { + + private val cache: Queue = LinkedList(List(size) { 0f }) + + override fun step(value: Float): Float { + val effect = value + cache.remove() * volume + cache.add(effect) + return effect + } +} + +class Limiter(private val limit_to: Float): StepFilter() { + override fun step(value: Float): Float = clamp(-limit_to, value, limit_to) +} + diff --git a/src/main/kotlin/filter/StepFilter.kt b/src/main/kotlin/filter/StepFilter.kt new file mode 100644 index 0000000..fef3be8 --- /dev/null +++ b/src/main/kotlin/filter/StepFilter.kt @@ -0,0 +1,39 @@ +package filter + +import SoundSamples +import java.lang.Float.max + +abstract class StepFilter { + abstract fun step(value: Float): Float + + open fun apply(samples: SoundSamples): SoundSamples = SoundSamples(samples.size) { i -> step(samples[i])} +} + +class FloatRingBuffer(val size: Int, default: Float = 0f) { + val array = FloatArray(size) {default} + var pos = 0 + + fun push(value: Float): Float { + val next_pos = pos++ % size + val old_val = array[next_pos] + array[next_pos] = value + return old_val + } + +} + + +class Compressor(size: Int): StepFilter() { + val buff = FloatRingBuffer(size, 1f) + var max_val : Float = 1f + + override fun step(value: Float): Float { + val old = buff.push(value) + max_val = max(value, max(old, max_val)) + + return value / max_val + } + +} + + diff --git a/src/main/kotlin/random/RandomDisplacementFractal.java b/src/main/kotlin/random/RandomDisplacementFractal.java new file mode 100644 index 0000000..978f87f --- /dev/null +++ b/src/main/kotlin/random/RandomDisplacementFractal.java @@ -0,0 +1,107 @@ +package random; +import java.util.Random; + +public class RandomDisplacementFractal { + + + /** Source of entropy */ + private Random rand_; + + /** Amount of roughness */ + float roughness_; + + /** Plasma fractal grid */ + private float[][] grid_; + + /** Generate a noise source based upon the midpoint displacement fractal. + * + * @param rand The random number generator + * @param roughness a roughness parameter + * @param width the width of the grid + * @param height the height of the grid + */ + public RandomDisplacementFractal(Random rand, float roughness, int width, int height) { + roughness_ = roughness / width; + grid_ = new float[width][height]; + rand_ = (rand == null) ? new Random() : rand; + } + + public void initialise() { + int xh = grid_.length - 1; + int yh = grid_[0].length - 1; + + // set the corner points + grid_[0][0] = rand_.nextFloat() - 0.5f; + grid_[0][yh] = rand_.nextFloat() - 0.5f; + grid_[xh][0] = rand_.nextFloat() - 0.5f; + grid_[xh][yh] = rand_.nextFloat() - 0.5f; + + // generate the fractal + generate(0, 0, xh, yh); + } + + + // Add a suitable amount of random displacement to a point + private float roughen(float v, int l, int h) { + return v + roughness_ * (float) (rand_.nextGaussian() * (h - l)); + } + + + // generate the fractal + private void generate(int xl, int yl, int xh, int yh) { + int xm = (xl + xh) / 2; + int ym = (yl + yh) / 2; + if ((xl == xm) && (yl == ym)) return; + + grid_[xm][yl] = 0.5f * (grid_[xl][yl] + grid_[xh][yl]); + grid_[xm][yh] = 0.5f * (grid_[xl][yh] + grid_[xh][yh]); + grid_[xl][ym] = 0.5f * (grid_[xl][yl] + grid_[xl][yh]); + grid_[xh][ym] = 0.5f * (grid_[xh][yl] + grid_[xh][yh]); + + float v = roughen(0.5f * (grid_[xm][yl] + grid_[xm][yh]), xl + yl, yh + + xh); + grid_[xm][ym] = v; + grid_[xm][yl] = roughen(grid_[xm][yl], xl, xh); + grid_[xm][yh] = roughen(grid_[xm][yh], xl, xh); + grid_[xl][ym] = roughen(grid_[xl][ym], yl, yh); + grid_[xh][ym] = roughen(grid_[xh][ym], yl, yh); + + generate(xl, yl, xm, ym); + generate(xm, yl, xh, ym); + generate(xl, ym, xm, yh); + generate(xm, ym, xh, yh); + } + + + /** + * Dump out as a CSV + */ + public void printAsCSV() { + for(int i = 0;i < grid_.length;i++) { + for(int j = 0;j < grid_[0].length;j++) { + System.out.print(grid_[i][j]); + System.out.print(","); + } + System.out.println(); + } + } + + + /** + * Convert to a Boolean array + * @return the boolean array + */ + public boolean[][] toBooleans() { + int w = grid_.length; + int h = grid_[0].length; + boolean[][] ret = new boolean[w][h]; + for(int i = 0;i < w;i++) { + for(int j = 0;j < h;j++) { + ret[i][j] = grid_[i][j] < 0; + } + } + return ret; + } + + +}