feat(service): add ExoPlayer controller and MediaSessionService

app/src/main/java/com/radiola/service/PlayerController.kt

@@ -0,0 +1,63 @@
+package com.radiola.service
+
+import android.content.Context
+import androidx.media3.common.AudioAttributes
+import androidx.media3.common.C
+import androidx.media3.common.MediaItem
+import androidx.media3.common.Player
+import androidx.media3.exoplayer.ExoPlayer
+import dagger.hilt.android.qualifiers.ApplicationContext
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import javax.inject.Inject
+import javax.inject.Singleton
+
+@Singleton
+class PlayerController @Inject constructor(
+    @ApplicationContext context: Context
+) {
+    private val _isPlaying = MutableStateFlow(false)
+    val isPlaying: StateFlow<Boolean> = _isPlaying
+
+    private val _currentStationPrefix = MutableStateFlow<String?>(null)
+    val currentStationPrefix: StateFlow<String?> = _currentStationPrefix
+
+    val exoPlayer: ExoPlayer = ExoPlayer.Builder(context)
+        .setAudioAttributes(
+            AudioAttributes.Builder()
+                .setUsage(C.USAGE_MEDIA)
+                .setContentType(C.AUDIO_CONTENT_TYPE_MUSIC)
+                .build(),
+            true
+        )
+        .setHandleAudioBecomingNoisy(true)
+        .build()
+        .apply {
+            addListener(object : Player.Listener {
+                override fun onIsPlayingChanged(playing: Boolean) {
+                    _isPlaying.value = playing
+                }
+            })
+        }
+
+    fun play(url: String, stationPrefix: String) {
+        val mediaItem = MediaItem.fromUri(url)
+        exoPlayer.setMediaItem(mediaItem)
+        exoPlayer.prepare()
+        exoPlayer.play()
+        _currentStationPrefix.value = stationPrefix
+    }
+
+    fun pause() {
+        exoPlayer.pause()
+    }
+
+    fun stop() {
+        exoPlayer.stop()
+        _currentStationPrefix.value = null
+    }
+
+    fun release() {
+        exoPlayer.release()
+    }
+}