dependecies
testImplementation(kotlin("test"))
implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.7.3")
implementation("ws.schild:jave-all-deps:3.4.0")
import kotlinx.coroutines.*
import ws.schild.jave.Encoder
import ws.schild.jave.MultimediaObject
import ws.schild.jave.encode.AudioAttributes
import ws.schild.jave.encode.EncodingAttributes
import java.io.File
import kotlin.system.measureTimeMillis
class AudioConverter {
suspend fun convertWavToMp3(inputDirectory: File, outputDirectory: File) = coroutineScope {
launch {
// Code in here won't block the main thread.
outputDirectory.mkdirs()
if (!inputDirectory.exists() || !inputDirectory.isDirectory) {
println("Input directory does not exist or is not a directory.")
return@launch
}
val files = inputDirectory.listFiles { file ->
file.extension == "wav"
} ?: arrayOf()
val jobs = files.map { inputFile ->
async(Dispatchers.IO) {
processFile(inputFile, outputDirectory)
}
}
jobs.awaitAll()
}
}
private fun createAudioAttributes(): AudioAttributes {
val audioAttributes = AudioAttributes()
audioAttributes.setCodec("libmp3lame")
audioAttributes.setBitRate(128000) // 128 kbps
audioAttributes.setChannels(2)
audioAttributes.setSamplingRate(44100)
return audioAttributes
}
private fun createEncodingAttributes(audioAttributes: AudioAttributes): EncodingAttributes {
val encodingAttributes = EncodingAttributes()
encodingAttributes.setOutputFormat("mp3")
encodingAttributes.setAudioAttributes(audioAttributes)
return encodingAttributes
}
private fun processFile(inputFile: File, outputDirectory: File) {
try {
val outputFileName = "${inputFile.nameWithoutExtension}.mp3"
val outputFile = File(outputDirectory, outputFileName)
val audioAttributes = createAudioAttributes()
val encodingAttributes = createEncodingAttributes(audioAttributes)
Encoder().encode(MultimediaObject(inputFile), outputFile, encodingAttributes)
} catch (exception: Exception) {
println("Error converting file ${inputFile.name}: ${exception.message}")
}
}
}
fun main() {
runBlocking {
println("What WAV files do you want to convert? (Path to directory):")
val userInputForWAV = readLine().toString()
println("Where would you like your MP3 files to end up? (Path to directory):")
val userInputForMP3 = readLine().toString()
val inputDirectoryPath = File(userInputForWAV)
val outputDirectoryPath = File(userInputForMP3)
val time = measureTimeMillis {
AudioConverter().convertWavToMp3(inputDirectoryPath, outputDirectoryPath)
}
println("Completed in $time ms")
}
}
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