Disable software aec if enabled but not needed anymore (only once, user can still enable it back later)

src/org/linphone/LinphoneManager.java

@@ -503,6 +503,14 @@ public class LinphoneManager implements LinphoneCoreListener {
 		if (prefMigrator.isMigrationNeeded()) {
 			prefMigrator.doMigration();
 		}
+		
+		// Some devices could be using software AEC before
+		// This will disable it in favor of hardware AEC if available
+		if (prefMigrator.isEchoMigratioNeeded()) {
+			Log.d("Echo canceller configuration need to be updated");
+			prefMigrator.doEchoMigration();
+			mPrefs.echoConfigurationUpdated();
+		}
 
 		mLc.setContext(mServiceContext);
 		mLc.setZrtpSecretsCache(basePath + "/zrtp_secrets");

src/org/linphone/LinphonePreferences.java

@@ -684,6 +684,14 @@ public class LinphonePreferences {
 	public int getEchoCalibration() {
 		return getConfig().getInt("sound", "ec_delay", -1);
 	}
+	
+	public boolean isEchoConfigurationUpdated() {
+		return getConfig().getBool("app", "ec_updated", false);
+	}
+	
+	public void echoConfigurationUpdated() {
+		getConfig().setBool("app", "ec_updated", true);
+	}
 	// End of audio settings
 	
 	// Video settings

src/org/linphone/PreferencesMigrator.java

@@ -44,6 +44,30 @@ public class PreferencesMigrator {
 		mOldPrefs = PreferenceManager.getDefaultSharedPreferences(context);
 	}
 	
+	public boolean isEchoMigratioNeeded() {
+		LinphoneCore lc = LinphoneManager.getLcIfManagerNotDestroyedOrNull();
+		if (lc == null) {
+			return false;
+		}
+		
+		if (mNewPrefs.isEchoConfigurationUpdated()) {
+			return false;
+		}
+		
+		return (!lc.needsEchoCalibration() && mNewPrefs.isEchoCancellationEnabled());
+	}
+	
+	public void doEchoMigration() {
+		LinphoneCore lc = LinphoneManager.getLcIfManagerNotDestroyedOrNull();
+		if (lc == null) {
+			return;
+		}
+		
+		if (!lc.needsEchoCalibration()) {
+			mNewPrefs.setEchoCancellation(false);
+		}
+	}
+	
 	public boolean isMigrationNeeded() {
 		int accountNumber = mOldPrefs.getInt(getString(R.string.pref_extra_accounts), -1);
 		return accountNumber != -1;