Add delta lock -- lock modem relative to center frequency

src/demod/DemodulatorInstance.cpp

@@ -373,6 +373,22 @@ void DemodulatorInstance::setTracking(bool tracking) {
     this->tracking = tracking;
 }
 
+bool DemodulatorInstance::isDeltaLock() {
+    return deltaLock.load();
+}
+
+void DemodulatorInstance::setDeltaLock(bool lock) {
+    deltaLock.store(lock);
+}
+
+void DemodulatorInstance::setDeltaLockOfs(int lockOfs) {
+    deltaLockOfs.store(lockOfs);
+}
+
+int DemodulatorInstance::getDeltaLockOfs() {
+    return deltaLockOfs.load();
+}
+
 bool DemodulatorInstance::isMuted() {
     return demodulatorThread->isMuted();
 }

src/demod/DemodulatorInstance.h

@@ -80,7 +80,12 @@ public:
 
     bool isTracking();
     void setTracking(bool tracking);
-    
+
+    bool isDeltaLock();
+    void setDeltaLock(bool lock);
+    void setDeltaLockOfs(int lockOfs);
+    int getDeltaLockOfs();
+
     bool isMuted();
     void setMuted(bool muted);
 
@@ -122,6 +127,8 @@ private:
     std::atomic_bool active;
     std::atomic_bool squelch;
     std::atomic_bool muted;
+    std::atomic_bool deltaLock;
+    std::atomic_int deltaLockOfs;
 
     std::atomic_int currentOutputDevice;
     std::atomic<float> currentAudioGain;

src/demod/DemodulatorMgr.cpp

@@ -11,7 +11,7 @@ bool inactiveCompare (DemodulatorInstance *i, DemodulatorInstance *j) { return (
 
 DemodulatorMgr::DemodulatorMgr() :
         activeDemodulator(NULL), lastActiveDemodulator(NULL), activeVisualDemodulator(NULL), lastBandwidth(DEFAULT_DEMOD_BW), lastDemodType(
-                DEFAULT_DEMOD_TYPE), lastSquelchEnabled(false), lastSquelch(-100), lastGain(1.0), lastMuted(false) {
+                DEFAULT_DEMOD_TYPE), lastSquelchEnabled(false), lastSquelch(-100), lastGain(1.0), lastMuted(false), lastDeltaLock(false) {
 }
 
 DemodulatorMgr::~DemodulatorMgr() {
@@ -284,6 +284,15 @@ void DemodulatorMgr::setLastGain(float lastGain) {
     this->lastGain = lastGain;
 }
 
+
+bool DemodulatorMgr::getLastDeltaLock() const {
+    return lastDeltaLock;
+}
+
+void DemodulatorMgr::setLastDeltaLock(bool lock) {
+    lastDeltaLock = lock;
+}
+
 float DemodulatorMgr::getLastSquelchLevel() const {
     return lastSquelch;
 }

src/demod/DemodulatorMgr.h

@@ -37,6 +37,9 @@ public:
     float getLastGain() const;
     void setLastGain(float lastGain);
 
+    bool getLastDeltaLock() const;
+    void setLastDeltaLock(bool lock);
+
     float getLastSquelchLevel() const;
     void setLastSquelchLevel(float lastSquelch);
 
@@ -67,6 +70,7 @@ private:
     float lastSquelch;
     float lastGain;
     bool lastMuted;
+    bool lastDeltaLock;
     
     std::map<std::string, ModemSettings> lastModemSettings;
 };