implement MidiPlayer for android

composeApp/src/androidMain/kotlin/mg/dot/feufaro/midi/MidiPlayer.kt

@@ -1,129 +1,142 @@
 package mg.dot.feufaro.midi
 
-import java.io.File
 import android.media.MediaPlayer
-import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.cancel
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
+import java.io.File
+import java.io.FileInputStream
 
 private var androidMediaPlayer: MediaPlayer?= null
 
 actual class MediaPlayer actual constructor(filename: String, onFinished: () -> Unit) {
-    private val player = androidMediaPlayer?.apply {
+    private var mediaPlayer: MediaPlayer? = MediaPlayer()
-        setDataSource(filename)
-        prepare()
-        setOnCompletionListener {
-            seekTo(0)
-            onFinished()
-        }
-//        val file = File(android.app.Instrumentation().context.filesDir, filename)
-//        if(file.exists()){
-//            androidMediaPlayer?.setDataSource(file.path)
-//            androidMediaPlayer?.prepare()
-//            androidMediaPlayer?.setOnCompletionListener {
-//                onFinished()
-//            }
-//        } else {
-//            println("Fichier midi non trouvée")
-//        }
-    }
     private val voiceStates = mutableListOf(true, true, true, true)
-    private var currentGlobalVolume: Float = 0.8f
+//    private var currentGlobalVolume: Float = 0.8f
 
     private var pointA: Long = -1L
     private var pointB: Long = -1L
+
+    private val playerScope = CoroutineScope(Dispatchers.Default + SupervisorJob())
+    private var abJob: Job? = null
+
     private var isLoopingAB: Boolean = false
+
+    init {
+        try {
+            val file = File(filename)
+            if (file.exists()) {
+                val fis = FileInputStream(file)
+                mediaPlayer?.setDataSource(fis.fd)
+                mediaPlayer?.prepare()
+                if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
+                    val params = mediaPlayer?.playbackParams ?: android.media.PlaybackParams()
+                    params.speed = 1.0f
+                    mediaPlayer?.playbackParams = params
+                }
+                fis.close()
+
+                mediaPlayer?.setOnCompletionListener {
+                    onFinished()
+                }
+            }
+        } catch (e: Exception) {
+            e.printStackTrace()
+        }
+    }
+
     actual fun play() {
-//        player?.start()
+        mediaPlayer?.start()
     }
     actual fun pause() {
-//        player?.pause()
+        mediaPlayer?.pause()
     }
     actual fun stop() {
-//        player?.stop()
+        mediaPlayer?.stop()
+        mediaPlayer?.prepare()
+        mediaPlayer?.seekTo(0)
+        clearLoop()
     }
+
     actual fun getDuration(): Long {
-//        player!!.duration.toLong() ?: 0L
+        return mediaPlayer?.duration?.toLong() ?: 0L
-        return 4.toLong()
     }
+
     actual fun getCurrentPosition(): Long {
-//        player!!.currentPosition.toLong()
+        return mediaPlayer?.currentPosition?.toLong() ?: 0L
-        return 4.toLong()
     }
+
     actual fun seekTo(position: Long) {
-//        player!!.seekTo(position.toInt())
+        mediaPlayer?.seekTo(position.toInt())
     }
-
 actual fun setVolume(level: Float) {
-//        currentGlobalVolume =level
+        mediaPlayer?.setVolume(level, level)
-//        player?.setVolume(level, level)
     }
 
-    actual fun getLoopState() = Triple(pointA, pointB, isLoopingAB)
+    actual fun setPointA() {
-
+        pointA = mediaPlayer?.currentPosition?.toLong() ?: 0L
-    actual fun toggleVoice(index: Int): Unit{
-        voiceStates[index] = !voiceStates[index]
     }
 
-    actual fun getVoiceStates(): List<Boolean> = voiceStates
+    actual fun setPointB() {
-
+        pointB = mediaPlayer?.currentPosition?.toLong() ?: 0L
-    actual fun changeInstru(noInstru: Int): Unit{
+        if (pointB > pointA && pointA != -1L) {
-
-    }
-
-    actual fun setPointA(): Unit{
-//        pointA = getCurrentPosition()
-    }
-
-    actual fun setPointB(): Unit{
-        pointB = getCurrentPosition()
-        if(pointB > pointA) {
             isLoopingAB = true
             startABMonitor()
         }
     }
 
-    actual fun clearLoop(): Unit{
+    actual fun clearLoop() {
         isLoopingAB = false
+        pointA = -1L
+        pointB = -1L
+        abJob?.cancel()
     }
+
     private fun startABMonitor() {
-        GlobalScope.launch {
+        abJob?.cancel()
+        abJob = playerScope.launch {
             while (isLoopingAB) {
-//                if ((player?.currentPosition ?: 0) >= pointB){
+                val currentPos = mediaPlayer?.currentPosition?.toLong() ?: 0L
-//                    player?.seekTo(pointA?.toInt())
+                if (currentPos >= pointB) {
-//                }
+                    mediaPlayer?.seekTo(pointA.toInt())
+                }
                 delay(50)
             }
         }
     }
-    actual fun setTempo(factor: Float){
 
+    actual fun getLoopState() = Triple(pointA, pointB, isLoopingAB)
+    actual fun toggleVoice(index: Int) {
+        voiceStates[index] = !voiceStates[index]
+        println("Toggle voice $index (Limitation: Nécessite SoundFont/Fluidsynth sur Android)")
+    }
+
+    actual fun getVoiceStates(): List<Boolean> = voiceStates
+
+    actual fun changeInstru(noInstru: Int) {
+    }
+
+    actual fun setTempo(factor: Float) {
+        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
+            mediaPlayer?.let {
+                val params = it.playbackParams
+                params.speed = factor
+                it.playbackParams = params
+            }
+        }
     }
 
     actual fun getCurrentBPM(): Float {
         return 120f
     }
-}
-/*
-actual fun MidiPlayer(filename: String, onFinished: () -> Unit) {
-    StopMidi()
-    val file = File(android.app.Instrumentation().context.filesDir, filename)
-    if(file.exists()){
-        androidMediaPlayer?.setDataSource(file.path)
-        androidMediaPlayer?.prepare()
-        androidMediaPlayer?.setOnCompletionListener {
-            onFinished()
-        }
-        androidMediaPlayer?.start()
-    }
-}
 
-actual fun StopMidi() {
+    fun release() {
-    androidMediaPlayer?.let {
+        mediaPlayer?.release()
-        if (it.isPlaying) {
+        mediaPlayer = null
-            it.stop()
+        playerScope.coroutineContext.cancel()
-            it.release()
     }
 }
-    androidMediaPlayer = null
-}*/