Trouble converting mp3 to pcm in Kotlin/Android Studio - UnsupportedAudioFileException - android-studio

Question

I've tried the following approaches:
mp3-to-wav-conversion-in-java
convert-mp3-to-pcm-in-java
Current Implementation:
...
var mp3URI = Uri.fromFile(file)
var mp3InputStream = this.contentResolver.openInputStream(mp3URI)
var byteArray = mp3InputStream!!.readBytes()
var pcmBytes = getAudioDataBytes(byteArray, AudioFormat(SAMPLE_RATE_HZ.toFloat(),16,1,true,false))
...
#Throws(UnsupportedAudioFileException::class, IllegalArgumentException::class, Exception::class)
fun getAudioDataBytes(sourceBytes: ByteArray?, audioFormat: AudioFormat?): ByteArray? {
require(!(sourceBytes == null || sourceBytes.size == 0 || audioFormat == null)) { "Illegal Argument passed to this method" }
var bais: ByteArrayInputStream? = null
var baos: ByteArrayOutputStream? = null
var sourceAIS: AudioInputStream? = null
var convert1AIS: AudioInputStream? = null
var convert2AIS: AudioInputStream? = null
return try {
bais = ByteArrayInputStream(sourceBytes)
sourceAIS = AudioSystem.getAudioInputStream(bais)
val sourceFormat: AudioFormat = sourceAIS.getFormat()
val convertFormat = AudioFormat(
AudioFormat.Encoding.PCM_SIGNED,
sourceFormat.sampleRate,
16,
sourceFormat.channels,
sourceFormat.channels * 2,
sourceFormat.sampleRate,
false
)
convert1AIS = AudioSystem.getAudioInputStream(convertFormat, sourceAIS)
convert2AIS = AudioSystem.getAudioInputStream(audioFormat, convert1AIS)
baos = ByteArrayOutputStream()
val buffer = ByteArray(8192)
while (true) {
val readCount: Int = convert2AIS.read(buffer, 0, buffer.size)
if (readCount == -1) {
break
}
baos.write(buffer, 0, readCount)
}
baos.toByteArray()
} catch (uafe: UnsupportedAudioFileException) {
//uafe.printStackTrace();
throw uafe
} catch (ioe: IOException) {
//ioe.printStackTrace();
throw ioe
} catch (iae: IllegalArgumentException) {
//iae.printStackTrace();
throw iae
} catch (e: Exception) {
//e.printStackTrace();
throw e
} finally {
if (baos != null) {
try {
baos.close()
} catch (e: Exception) {
}
}
if (convert2AIS != null) {
try {
convert2AIS.close()
} catch (e: Exception) {
}
}
if (convert1AIS != null) {
try {
convert1AIS.close()
} catch (e: Exception) {
}
}
if (sourceAIS != null) {
try {
sourceAIS.close()
} catch (e: Exception) {
}
}
if (bais != null) {
try {
bais.close()
} catch (e: Exception) {
}
}
}
}
the approaches I've tried are giving me javax.sound.sampled.UnsupportedAudioFileException at the line
sourceAIS = AudioSystem.getAudioInputStream(bais)
I take it some of the .jar files need to be added to the run-time class-path. I figured putting the jar files in the libs folder and doing the gradle implementation was all that would be needed but apparently not. Where are the .jar files supposed to go so they are in the run-time class-path? Or if you have an easier way to convert an mp3 into pcm bytes I'd love to hear it.
Gradle dependancies:
dependencies {
implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
implementation 'androidx.core:core-ktx:1.3.2'
implementation 'androidx.appcompat:appcompat:1.2.0'
implementation 'com.google.android.material:material:1.2.1'
implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
implementation files('libs\\mp3plugin.jar')
implementation files('libs\\net.sourceforge.lame-3.98.4.jar')
implementation files('libs\\tritonus-share-0.3.7-2.jar')
implementation files('libs\\jl-1.0.1.jar')
implementation files('libs\\tritonus_mp3-0.3.6.jar')
implementation files('libs\\mp3spi-1.9.5-2.jar')
testImplementation 'junit:junit:4.+'
androidTestImplementation 'androidx.test.ext:junit:1.1.2'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
}

Answer 1

Turns out the jLayer libraby has a converter that some people find too slow but works fine for my purposes
var converter = Converter()
converter.convert(mp3File, wavFile)
From there just need to load the wav file, remove the wav header and fix the edieness