Fix NXDN transmit issue and android USB device buffer overflow crash bug

android/AndroidManifest.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0"?>
 <manifest package="org.dudetronics.droidstar" xmlns:android="http://schemas.android.com/apk/res/android" android:versionName="-- %%INSERT_VERSION_NAME%% --" android:versionCode="57" android:installLocation="auto">
-	<uses-sdk android:minSdkVersion="21" android:targetSdkVersion="29"/>
+	<uses-sdk android:minSdkVersion="21" android:targetSdkVersion="30"/>
 
 	<!-- The following comment will be replaced upon deployment with default permissions based on the dependencies of the application.
 		 Remove the comment if you do not require these default permissions. -->

androidserialport.cpp

@@ -64,6 +64,7 @@ int AndroidSerialPort::write(char *data, int s)
 	jbyteArray buffer = env->NewByteArray(s);
 	env->SetByteArrayRegion(buffer, 0, s, (jbyte *)data);
 	serialJavaObject.callMethod<void>("write", "([B)V", buffer);
+	env->DeleteLocalRef(buffer);
 	return 0;
 }
 
@@ -73,6 +74,7 @@ int AndroidSerialPort::write(QByteArray data)
 	jbyteArray buffer = env->NewByteArray(data.size());
 	env->SetByteArrayRegion(buffer, 0, data.size(), (jbyte *)data.data());
 	serialJavaObject.callMethod<void>("write", "([B)V", buffer);
+	env->DeleteLocalRef(buffer);
 	return 0;
 }
 

nxdncodec.cpp

@@ -282,7 +282,6 @@ void NXDNCodec::send_disconnect()
 
 void NXDNCodec::transmit()
 {
-	uint8_t ambe_frame[49];
 	uint8_t ambe[7];
 	int16_t pcm[160];
 
@@ -314,13 +313,11 @@ void NXDNCodec::transmit()
 	}
 	else{
 		if(m_modeinfo.sw_vocoder_loaded){
-			m_mbevocoder->encode_2450(pcm, ambe_frame);
-		}
-		for(int i = 0; i < 7; ++i){
-			for(int j = 0; j < 8; ++j){
-				ambe[i] |= (ambe_frame[(i*8)+j] << (7-j));
+			m_mbevocoder->encode_2450(pcm, ambe);
 		}
 		ambe[6] &= 0x80;
+
+		for(int i = 0; i < 7; ++i){
 			m_txcodecq.append(ambe[i]);
 		}
 	}