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Add ability to compile notes to MIDI file

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Bartłomiej Przemysław Pluta
2020-03-17 20:42:24 +01:00
parent 8c3b6234ab
commit 4cb234bdba
2 changed files with 19 additions and 4 deletions
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4
modules/midi/src/main/kotlin/io/smnp/ext/function/MidiFunction.kt
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@@ -85,6 +85,10 @@ class MidiFunction : Function("midi") {
?: throw CustomException("Invalid parameter type: 'bpm' is supposed to be of int type")
"ppq" -> value as? Int
?: throw CustomException("Invalid parameter type: 'ppq' is supposed to be of int type")
"output" -> value as? String
?: throw CustomException("Invalid parameter type: 'output' is supposed to be of string type")
"play" -> value as? Boolean
?: throw CustomException("Invalid parameter type: 'play' is supposed to be of bool type")
else -> value
}
}.toMap()

19
modules/midi/src/main/kotlin/io/smnp/ext/midi/Midi.kt
View File

@@ -8,11 +8,12 @@ import javax.sound.midi.Sequencer
object Midi {
private const val DEFAULT_PPQ = 1000
private const val DEFAULT_BPM = 120
private const val MIDI_FILE_TYPE = 1
private val sequencer = MidiSystem.getSequencer()
private val synthesizer = MidiSystem.getSynthesizer()
val instruments: List<String>
get() = synthesizer.availableInstruments.map { it.toString() }
get() = synthesizer.availableInstruments.map { it.toString() }
fun playFile(file: String) {
playSequence(MidiSystem.getSequence(File(file)))
@@ -35,15 +36,24 @@ object Midi {
val sequence = Sequence(Sequence.PPQ, (config.getOrDefault("ppq", DEFAULT_PPQ) as Int))
provideCompiler(config).compileLines(lines, sequence)
play(sequence)
writeToFile(sequence)
}
private fun provideCompiler(config: Map<String, Any>): SequenceCompiler =
if(config.containsKey("ppq")) PpqSequenceCompiler()
if (config.containsKey("ppq")) PpqSequenceCompiler()
else DefaultSequenceCompiler()
private fun play(sequence: Sequence) {
playSequence(sequence) {
Midi.sequencer.tempoInBPM = (config.getOrDefault("bpm", DEFAULT_BPM) as Int).toFloat()
(config.getOrDefault("play", true) as Boolean).takeIf { it }?.let {
playSequence(sequence) {
Midi.sequencer.tempoInBPM = (config.getOrDefault("bpm", DEFAULT_BPM) as Int).toFloat()
}
}
}
private fun writeToFile(sequence: Sequence) {
config.getOrDefault("output", null)?.let {
MidiSystem.write(sequence, MIDI_FILE_TYPE, File(it as String))
}
}
@@ -51,6 +61,7 @@ object Midi {
val sequence = Sequence(Sequence.PPQ, (config.getOrDefault("ppq", DEFAULT_PPQ) as Int))
provideCompiler(config).compileChannels(channels, sequence)
play(sequence)
writeToFile(sequence)
}
}