CMF Buds 2a: Add low latency mode

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/devicesettings/DeviceSettingsPreferenceConst.java

@@ -374,6 +374,7 @@ public class DeviceSettingsPreferenceConst {
 
     public static final String PREF_NOTHING_EAR1_INEAR = "pref_nothing_inear_detection";
     public static final String PREF_NOTHING_EAR1_AUDIOMODE = "pref_nothing_audiomode";
+    public static final String PREF_HEADPHONES_LOW_LATENCY = "pref_headphones_low_latency";
 
 
     public static final String PREF_HUAWEI_FREEBUDS_INEAR = "pref_freebuds_inear_detection";

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/devicesettings/DeviceSpecificSettingsFragment.java

@@ -730,6 +730,7 @@ public class DeviceSpecificSettingsFragment extends AbstractPreferenceFragment i
 
         addPreferenceHandlerFor(PREF_NOTHING_EAR1_INEAR);
         addPreferenceHandlerFor(PREF_NOTHING_EAR1_AUDIOMODE);
+        addPreferenceHandlerFor(PREF_HEADPHONES_LOW_LATENCY);
 
         addPreferenceHandlerFor(PREF_HUAWEI_FREEBUDS_INEAR);
         addPreferenceHandlerFor(PREF_HUAWEI_FREEBUDS_AUDIOMODE);

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/nothing/AbstractEarCoordinator.java

@@ -66,6 +66,9 @@ public abstract class AbstractEarCoordinator extends AbstractBLClassicDeviceCoor
     public DeviceSpecificSettings getDeviceSpecificSettings(final GBDevice device) {
         final DeviceSpecificSettings deviceSpecificSettings = new DeviceSpecificSettings();
         deviceSpecificSettings.addRootScreen(R.xml.devicesettings_nothing_ear1);
+        if (supportsLowLatency()) {
+            deviceSpecificSettings.addRootScreen(R.xml.devicesettings_headphones_low_latency);
+        }
         deviceSpecificSettings.addRootScreen(R.xml.devicesettings_headphones);
         return deviceSpecificSettings;
     }
@@ -93,4 +96,8 @@ public abstract class AbstractEarCoordinator extends AbstractBLClassicDeviceCoor
     public abstract boolean supportsAdaptiveAnc();
 
     public abstract boolean supportsMediumAnc();
+
+    public boolean supportsLowLatency() {
+        return false;
+    }
 }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/nothing/CmfBuds2aCoordinator.java

@@ -55,9 +55,19 @@ public class CmfBuds2aCoordinator extends AbstractEarCoordinator {
     public boolean supportsTransparency() {
         return true;
     }
-    @Override
-    public boolean supportsMediumAnc() { return false; }
 
     @Override
-    public boolean supportsAdaptiveAnc() { return false; }
+    public boolean supportsMediumAnc() {
+        return false;
+    }
+
+    @Override
+    public boolean supportsAdaptiveAnc() {
+        return false;
+    }
+
+    @Override
+    public boolean supportsLowLatency() {
+        return true;
+    }
 }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/nothing/Ear1Support.java

@@ -128,6 +128,13 @@ public class Ear1Support extends AbstractHeadphoneBTBRDeviceSupport {
                 sendCommand("set audio mode", nothingProtocol.encodeAudioMode(prefs.getString(DeviceSettingsPreferenceConst.PREF_NOTHING_EAR1_AUDIOMODE, "off")));
                 // response: 55 20 01 0F 70 00 00 00
                 break;
+            case DeviceSettingsPreferenceConst.PREF_HEADPHONES_LOW_LATENCY:
+                sendCommand("set low latency", nothingProtocol.encodeLowLatency(prefs.getBoolean(DeviceSettingsPreferenceConst.PREF_HEADPHONES_LOW_LATENCY, false)));
+                // ON:           55 6001 40F0 0100 34 01 47 0253
+                // ON Response:  55 6001 4070 0000 34 FF FF95
+                // OFF:          55 6001 40F0 0100 5C 02 28 9353
+                // OFF Response: 55 6001 4070 0000 5C FF FF95
+                break;
             default:
                 LOG.debug("CONFIG: " + config);
                 break;
@@ -158,6 +165,7 @@ public class Ear1Support extends AbstractHeadphoneBTBRDeviceSupport {
         private static final short firmware_version = (short) 0xc042;
         private static final short audio_mode_status = (short) 0xc01e;
         private static final short audio_mode_status2 = (short) 0xe003;
+        private static final short low_latency = (short) 0xf040;
 
         private static final short unk_maybe_ack = (short) 0xf002;
         private static final short unk_close_case = (short) 0xe002; //sent twice when the case is closed with earphones in
@@ -359,6 +367,11 @@ public class Ear1Support extends AbstractHeadphoneBTBRDeviceSupport {
             return encodeMessage((short) 0x120, audio_mode, payload);
         }
 
+        byte[] encodeLowLatency(boolean enabled) {
+            final byte payload = (byte) (enabled ? 0x01 : 0x02);
+            return encodeMessage((short) 0x120, low_latency, new byte[]{payload});
+        }
+
         public byte[] encodeFindDevice(boolean start) {
             byte payload = (byte) (start ? 0x01 : 0x00);
             return encodeMessage((short) 0x120, find_device, new byte[]{payload});

app/src/main/res/xml/devicesettings_headphones_low_latency.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.preference.PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+    <SwitchPreferenceCompat
+        android:defaultValue="false"
+        android:icon="@drawable/ic_videogame"
+        android:key="pref_headphones_low_latency"
+        android:layout="@layout/preference_checkbox"
+        android:summary="@string/earfun_low_latency_mode_hint"
+        android:title="@string/earfun_low_latency_mode" />
+</androidx.preference.PreferenceScreen>