#endif
#include <simgear/compiler.h>
+#include <simgear/sound/soundmgr.hxx>
#include <plib/sl.h>
#include <plib/sm.h>
-#include "soundmgr.hxx"
-
// Quoting from http://www.kluft.com/~ikluft/ham/morse-intro.html by
// Ian Kluft KO6YQ <ikluft@kluft.com>
static const char end = '0';
static const int BYTES_PER_SECOND = 8000;
-static const int BEAT_LENGTH = 240; // milleseconds (5 wpm)
-// static const int BEAT_LENGTH = 92; // milleseconds (13 wpm)
+// static const int BEAT_LENGTH = 240; // milleseconds (5 wpm)
+static const int BEAT_LENGTH = 92; // milleseconds (13 wpm)
static const int TRANSITION_BYTES = (int)(0.005 * BYTES_PER_SECOND);
static const int COUNT_SIZE = BYTES_PER_SECOND * BEAT_LENGTH / 1000;
static const int DIT_SIZE = 2 * COUNT_SIZE; // 2 counts
static const int DAH_SIZE = 4 * COUNT_SIZE; // 4 counts
static const int SPACE_SIZE = 3 * COUNT_SIZE; // 3 counts
-static const int FREQUENCY = 1020; // AIM 1-1-7 (f) specified in Hz
+static const int LO_FREQUENCY = 1020; // AIM 1-1-7 (f) specified in Hz
+static const int HI_FREQUENCY = 1350; // AIM 1-1-7 (f) specified in Hz
// manages everything we need to know for an individual sound sample
class FGMorse {
- unsigned char dit[ DIT_SIZE ] ;
- unsigned char dah[ DAH_SIZE ] ;
+private:
+
+ unsigned char hi_dit[ DIT_SIZE ] ;
+ unsigned char lo_dit[ DIT_SIZE ] ;
+ unsigned char hi_dah[ DAH_SIZE ] ;
+ unsigned char lo_dah[ DAH_SIZE ] ;
unsigned char space[ SPACE_SIZE ] ;
+ unsigned char cust_dit[ DIT_SIZE ] ;
+ unsigned char cust_dah[ DAH_SIZE ] ;
+
+ bool cust_init( const int freq );
+
public:
FGMorse();
// allocate and initialize sound samples
bool init();
- // make a FGSimpleSound morse code transmission for the specified string
- FGSimpleSound *make_ident( const string& id );
+ // make a SimpleSound morse code transmission for the specified string
+ SGSimpleSound *make_ident( const string& id,
+ const int freq = LO_FREQUENCY );
};
+/**
+ * \relates FGMorse
+ * Make a tone of specified freq and total_len with trans_len ramp in
+ * and out and only the first len bytes with sound, the rest with
+ * silence.
+ * @param buf unsigned char pointer to sound buffer
+ * @param freq desired frequency of tone
+ * @param len length of tone within sound
+ * @param total_len total length of sound (anything more than len is padded
+ * with silence.
+ * @param trans_len length of ramp up and ramp down to avoid audio "pop"
+ */
+void make_tone( unsigned char *buf, int freq,
+ int len, int total_len, int trans_len );
+
#endif // _MORSE_HXX