Check if volume boost effect is supported on the device

app/src/main/java/de/danoeh/antennapod/preferences/VolumeAdaptationPreference.java

@@ -0,0 +1,27 @@
+package de.danoeh.antennapod.preferences;
+
+import android.content.Context;
+import android.util.AttributeSet;
+
+import java.util.Arrays;
+
+import de.danoeh.antennapod.model.feed.VolumeAdaptionSetting;
+
+public class VolumeAdaptationPreference extends MaterialListPreference {
+    public VolumeAdaptationPreference(Context context) {
+        super(context);
+    }
+
+    public VolumeAdaptationPreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    public CharSequence[] getEntries() {
+        if (VolumeAdaptionSetting.isBoostSupported()) {
+            return super.getEntries();
+        } else {
+            return Arrays.copyOfRange(super.getEntries(), 0, 3);
+        }
+    }
+}

app/src/main/res/xml/feed_settings.xml

@@ -48,7 +48,7 @@
         android:summary="@string/global_default"
         android:title="@string/auto_delete_label" />
 
-    <de.danoeh.antennapod.preferences.MaterialListPreference
+    <de.danoeh.antennapod.preferences.VolumeAdaptationPreference
         android:defaultValue="off"
         android:entries="@array/spnVolumeAdaptationItems"
         android:entryValues="@array/spnVolumeAdaptationValues"

core/src/main/java/de/danoeh/antennapod/core/service/playback/ExoPlayerWrapper.java

@@ -7,6 +7,7 @@
 import android.util.Log;
 import android.view.SurfaceHolder;
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 import androidx.core.util.Consumer;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.DefaultLoadControl;
@@ -37,6 +38,7 @@
 import com.google.android.exoplayer2.upstream.HttpDataSource;
 import de.danoeh.antennapod.core.ClientConfig;
 import de.danoeh.antennapod.core.R;
+import de.danoeh.antennapod.model.feed.VolumeAdaptionSetting;
 import de.danoeh.antennapod.storage.preferences.UserPreferences;
 import de.danoeh.antennapod.core.service.download.AntennapodHttpClient;
 import de.danoeh.antennapod.core.service.download.HttpCredentialEncoder;
@@ -69,7 +71,8 @@ public class ExoPlayerWrapper {
     private PlaybackParameters playbackParameters;
     private DefaultTrackSelector trackSelector;
 
-    private LoudnessEnhancer loudnessEnhancer;
+    @Nullable
+    private LoudnessEnhancer loudnessEnhancer = null;
 
     ExoPlayerWrapper(Context context) {
         this.context = context;
@@ -247,11 +250,15 @@ public void setPlaybackParams(float speed, boolean skipSilence) {
     public void setVolume(float v, float v1) {
         if (v > 1) {
             exoPlayer.setVolume(1f);
-            loudnessEnhancer.setEnabled(true);
-            loudnessEnhancer.setTargetGain((int) (1000 * (v - 1)));
+            if (loudnessEnhancer != null) {
+                loudnessEnhancer.setEnabled(true);
+                loudnessEnhancer.setTargetGain((int) (1000 * (v - 1)));
+            }
         } else {
             exoPlayer.setVolume(v);
-            loudnessEnhancer.setEnabled(false);
+            if (loudnessEnhancer != null) {
+                loudnessEnhancer.setEnabled(false);
+            }
         }
     }
 
@@ -354,6 +361,10 @@ void setOnBufferingUpdateListener(Consumer<Integer> bufferingUpdateListener) {
     }
 
     private void initLoudnessEnhancer(int audioStreamId) {
+        if (!VolumeAdaptionSetting.isBoostSupported()) {
+            return;
+        }
+
         LoudnessEnhancer newEnhancer = new LoudnessEnhancer(audioStreamId);
         LoudnessEnhancer oldEnhancer = this.loudnessEnhancer;
         if (oldEnhancer != null) {

core/src/test/java/de/danoeh/antennapod/core/feed/VolumeAdaptionSettingTest.java

@@ -1,6 +1,9 @@
 package de.danoeh.antennapod.core.feed;
 
 import de.danoeh.antennapod.model.feed.VolumeAdaptionSetting;
+
+import org.junit.After;
+import org.junit.Before;
 import org.junit.Test;
 
 import static org.hamcrest.Matchers.equalTo;
@@ -11,6 +14,16 @@
 
 public class VolumeAdaptionSettingTest {
 
+    @Before
+    public void setUp() throws Exception {
+        VolumeAdaptionSetting.setBoostSupported(false);
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        VolumeAdaptionSetting.setBoostSupported(null);
+    }
+
     @Test
     public void mapOffToInteger() {
         VolumeAdaptionSetting setting = VolumeAdaptionSetting.OFF;

model/src/main/java/de/danoeh/antennapod/model/feed/VolumeAdaptionSetting.java

@@ -1,5 +1,10 @@
 package de.danoeh.antennapod.model.feed;
 
+import android.media.audiofx.AudioEffect;
+
+import androidx.annotation.Nullable;
+import androidx.annotation.VisibleForTesting;
+
 public enum VolumeAdaptionSetting {
     OFF(0, 1.0f),
     LIGHT_REDUCTION(1, 0.5f),
@@ -32,4 +37,29 @@ public int toInteger() {
     public float getAdaptionFactor() {
         return adaptionFactor;
     }
+
+    @Nullable
+    private static Boolean boostSupported = null;
+
+    public static boolean isBoostSupported() {
+        if (boostSupported != null) {
+            return boostSupported;
+        }
+        final AudioEffect.Descriptor[] audioEffects = AudioEffect.queryEffects();
+        if (audioEffects != null) {
+            for (AudioEffect.Descriptor effect : audioEffects) {
+                if (effect.type.equals(AudioEffect.EFFECT_TYPE_LOUDNESS_ENHANCER)) {
+                    boostSupported = true;
+                    return boostSupported;
+                }
+            }
+        }
+        boostSupported = false;
+        return boostSupported;
+    }
+
+    @VisibleForTesting
+    public static void setBoostSupported(@Nullable Boolean boostSupported) {
+        VolumeAdaptionSetting.boostSupported = boostSupported;
+    }
 }