Equalizer (nativ), Dolby-Atmos-Zugang und Auto-Wiedergabe bei Kopfhoerern

- Native Bruecke AudioEffectsBridge.kt: Equalizer + BassBoost + Virtualizer auf der Audio-Session des Players, inkl. System-Klangeffekt-Panel - Dart-Seite AudioEffects: Presets, Baender, Bass/Immersiv, persistiert - EqualizerScreen nach Vorlage inkl. Drehregler (CustomPainter) - Auto-Wiedergabe bei verbundenen Kopfhoerern (Klinke + Bluetooth) - MODIFY_AUDIO_SETTINGS im Manifest - Einstellungen: neuer Bereich "Ton" Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011snPXPafPC5i87o68H14W7
2026-08-20 18:35:06 +02:00
parent 7aa98864aa
commit 1325badf90
13 changed files with 1020 additions and 1 deletions
@@ -0,0 +1,140 @@
+package de.baka.melo
+
+import android.app.Activity
+import android.content.Intent
+import android.media.audiofx.AudioEffect
+import android.media.audiofx.BassBoost
+import android.media.audiofx.Equalizer
+import android.media.audiofx.Virtualizer
+import io.flutter.plugin.common.MethodCall
+import io.flutter.plugin.common.MethodChannel
+
+/**
+ * Bruecke zu android.media.audiofx: Equalizer, Bass-Boost und Virtualizer
+ * ("Immersives Audio") auf der Audio-Session des Players.
+ *
+ * Effekte haengen an einer Session-ID. just_audio meldet die ID erst, wenn
+ * gespielt wird — bei jedem Wechsel ruft Dart erneut [attach] auf, deshalb
+ * werden die alten Effekte vorher freigegeben.
+ */
+class AudioEffectsBridge(private val activity: Activity) {
+
+    companion object {
+        const val CHANNEL = "de.baka.melo/audio_effects"
+        /** Prioritaet der Effekte gegenueber anderen Apps auf derselben Session. */
+        private const val PRIORITY = 0
+    }
+
+    private var equalizer: Equalizer? = null
+    private var bassBoost: BassBoost? = null
+    private var virtualizer: Virtualizer? = null
+    private var sessionId: Int = 0
+    private var enabled: Boolean = false
+
+    fun handle(call: MethodCall, result: MethodChannel.Result) {
+        try {
+            when (call.method) {
+                "attach" -> result.success(attach(call.argument<Int>("sessionId") ?: 0))
+                "setEnabled" -> {
+                    enabled = call.argument<Boolean>("enabled") ?: false
+                    equalizer?.enabled = enabled
+                    bassBoost?.enabled = enabled
+                    virtualizer?.enabled = enabled
+                    result.success(null)
+                }
+                "setBandLevel" -> {
+                    val band = (call.argument<Int>("band") ?: 0).toShort()
+                    val level = (call.argument<Int>("level") ?: 0).toShort()
+                    equalizer?.setBandLevel(band, level)
+                    result.success(null)
+                }
+                "usePreset" -> {
+                    val preset = (call.argument<Int>("preset") ?: 0).toShort()
+                    equalizer?.usePreset(preset)
+                    result.success(currentLevels())
+                }
+                "setBassStrength" -> {
+                    val strength = (call.argument<Int>("strength") ?: 0).toShort()
+                    bassBoost?.let { if (it.strengthSupported) it.setStrength(strength) }
+                    result.success(null)
+                }
+                "setVirtualizerStrength" -> {
+                    val strength = (call.argument<Int>("strength") ?: 0).toShort()
+                    virtualizer?.let { if (it.strengthSupported) it.setStrength(strength) }
+                    result.success(null)
+                }
+                "openSystemPanel" -> result.success(openSystemPanel())
+                "release" -> {
+                    release()
+                    result.success(null)
+                }
+                else -> result.notImplemented()
+            }
+        } catch (e: Exception) {
+            // Nicht jedes Geraet stellt jeden Effekt bereit; die App soll
+            // deswegen nicht abstuerzen, sondern den Fehler anzeigen koennen.
+            result.error("audio_effects", e.message, null)
+        }
+    }
+
+    private fun attach(newSessionId: Int): Map<String, Any> {
+        release()
+        sessionId = newSessionId
+
+        val eq = Equalizer(PRIORITY, sessionId)
+        eq.enabled = enabled
+        equalizer = eq
+
+        bassBoost = runCatching { BassBoost(PRIORITY, sessionId).also { it.enabled = enabled } }
+            .getOrNull()
+        virtualizer = runCatching { Virtualizer(PRIORITY, sessionId).also { it.enabled = enabled } }
+            .getOrNull()
+
+        val bands = (0 until eq.numberOfBands).map { index ->
+            mapOf(
+                "index" to index,
+                "centerFrequencyMilliHz" to eq.getCenterFreq(index.toShort()),
+                "level" to eq.getBandLevel(index.toShort()).toInt()
+            )
+        }
+        val presets = (0 until eq.numberOfPresets).map { eq.getPresetName(it.toShort()) }
+
+        return mapOf(
+            "bands" to bands,
+            "presets" to presets,
+            "minLevel" to eq.bandLevelRange[0].toInt(),
+            "maxLevel" to eq.bandLevelRange[1].toInt(),
+            "bassSupported" to (bassBoost?.strengthSupported ?: false),
+            "virtualizerSupported" to (virtualizer?.strengthSupported ?: false)
+        )
+    }
+
+    private fun currentLevels(): List<Int> {
+        val eq = equalizer ?: return emptyList()
+        return (0 until eq.numberOfBands).map { eq.getBandLevel(it.toShort()).toInt() }
+    }
+
+    /**
+     * Oeffnet die Klangeffekt-Oberflaeche des Systems — auf POCO/Xiaomi ist
+     * das die Dolby-Atmos-Seite. Gibt false zurueck, wenn kein System die
+     * Anzeige unterstuetzt.
+     */
+    private fun openSystemPanel(): Boolean {
+        val intent = Intent(AudioEffect.ACTION_DISPLAY_AUDIO_EFFECT_CONTROL_PANEL)
+            .putExtra(AudioEffect.EXTRA_AUDIO_SESSION, sessionId)
+            .putExtra(AudioEffect.EXTRA_PACKAGE_NAME, activity.packageName)
+            .putExtra(AudioEffect.EXTRA_CONTENT_TYPE, AudioEffect.CONTENT_TYPE_MUSIC)
+        if (intent.resolveActivity(activity.packageManager) == null) return false
+        activity.startActivity(intent)
+        return true
+    }
+
+    fun release() {
+        equalizer?.release()
+        bassBoost?.release()
+        virtualizer?.release()
+        equalizer = null
+        bassBoost = null
+        virtualizer = null
+    }
+}