Fix PSK viewer crash

The psk ctor was calling psk::restart() which in turn called the global
pskviewer's restart(), possibly deallocating memory in use by another psk
instance.  This would happen when changing PSK modes with the Viewer window
visible, as a new modem is constructed before the old one is destroyed.

Add a psk class viewpsk member and make the global pskviewer point to it.

src/include/psk.h

@@ -31,6 +31,8 @@
 #include "filters.h"
 #include "pskcoeff.h"
 #include "pskvaricode.h"
+#include "viewpsk.h"
+#include "pskeval.h"
 
 //=====================================================================
 #define	PskSampleRate	(8000)
@@ -87,6 +89,9 @@ private:
 	complex			quality;
 	int				acquire;
 
+	viewpsk*		pskviewer;
+	pskeval*		evalpsk;
+
 	void			rx_symbol(complex symbol);
 	void 			rx_bit(int bit);
 	void			rx_qpsk(int bits);

src/include/viewpsk.h

@@ -29,6 +29,7 @@
 #include "trx.h"
 #include "filters.h"
 #include "fldigi-config.h"
+#include "pskeval.h"
 
 //=====================================================================
 #define	VPSKSAMPLERATE	(8000)
@@ -69,6 +70,8 @@ private:
 	time_t			now;
 	time_t			timeout[MAXCHANNELS];
 
+	pskeval*		evalpsk;
+
 	void			rx_symbol(int ch, complex symbol);
 	void 			rx_bit(int ch, int bit);
 
@@ -76,7 +79,7 @@ private:
 	void			afc(int);
 	
 public:
-	viewpsk(trx_mode mode);
+	viewpsk(pskeval* eval, trx_mode mode);
 	~viewpsk();
 	void init();
 	void restart(trx_mode mode);

src/psk/psk.cxx

@@ -60,7 +60,6 @@ extern waterfall *wf;
 
 char pskmsg[80];
 viewpsk *pskviewer = (viewpsk *)0;
-pskeval *evalpsk = (pskeval *)0;
 
 void psk::tx_init(SoundBase *sc)
 {
@@ -92,9 +91,7 @@ void psk::rx_init()
 
 void psk::restart()
 {
-	if (!pskviewer) pskviewer = new viewpsk(mode);
-	else		    pskviewer->restart(mode);
-	if (!evalpsk) evalpsk = new pskeval;
+	pskviewer->restart(mode);
 	evalpsk->setbw(bandwidth);
 }
 
@@ -118,6 +115,10 @@ psk::~psk()
 	if (fir2) delete fir2;
 	if (snfilt) delete snfilt;
 	if (imdfilt) delete imdfilt;
+	if (::pskviewer == pskviewer)
+		::pskviewer = 0;
+	delete pskviewer;
+	delete evalpsk;
 }
 
 psk::psk(trx_mode pskmode) : modem()
@@ -236,6 +237,9 @@ psk::psk(trx_mode pskmode) : modem()
 	E1 = E2 = E3 = 0.0;
 	acquire = 0;
 
+	evalpsk = new pskeval;
+	::pskviewer = pskviewer = new viewpsk(evalpsk, mode);
+
 	init();
 }
 

src/psk/viewpsk.cxx

@@ -43,20 +43,20 @@
 #include "qrunner.h"
 
 extern waterfall *wf;
-extern pskeval *evalpsk;
 
 //=====================================================================
 // Change the following for DCD low pass filter adjustment
 #define SQLCOEFF 0.01
 //=====================================================================
 
-viewpsk::viewpsk(trx_mode pskmode)
+viewpsk::viewpsk(pskeval* eval, trx_mode pskmode)
 {
 	for (int i = 0; i < MAXCHANNELS; i++) {
 		fir1[i] = (C_FIR_filter *)0;
 		fir2[i] = (C_FIR_filter *)0;
 	}
 
+	evalpsk = eval;
 	viewmode = MODE_PREV;	
 	restart(pskmode);
 }