//
// Written by Curtis Olson, started March 2001.
//
-// Copyright (C) 2001 Curtis L. Olson - curt@flightgear.org
+// Copyright (C) 2001 Curtis L. Olson - http://www.flightgear.org/~curt
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
-// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
-// $Id$
+#include <simgear/constants.h>
+
#include "morse.hxx"
+#include <cstring>
+
+static const char DI = '1';
+static const char DIT = '1';
+static const char DA = '2';
+static const char DAH = '2';
+static const char END = '0';
static const char alphabet[26][4] = {
- { DI, DAH, end, end }, /* A */
+ { DI, DAH, END, END }, /* A */
{ DA, DI, DI, DIT }, /* B */
{ DA, DI, DA, DIT }, /* C */
- { DA, DI, DIT, end }, /* D */
- { DIT, end, end, end }, /* E */
+ { DA, DI, DIT, END }, /* D */
+ { DIT, END, END, END }, /* E */
{ DI, DI, DA, DIT }, /* F */
- { DA, DA, DIT, end }, /* G */
+ { DA, DA, DIT, END }, /* G */
{ DI, DI, DI, DIT }, /* H */
- { DI, DIT, end, end }, /* I */
+ { DI, DIT, END, END }, /* I */
{ DI, DA, DA, DAH }, /* J */
- { DA, DI, DAH, end }, /* K */
+ { DA, DI, DAH, END }, /* K */
{ DI, DA, DI, DIT }, /* L */
- { DA, DAH, end, end }, /* M */
- { DA, DIT, end, end }, /* N */
- { DA, DA, DAH, end }, /* O */
+ { DA, DAH, END, END }, /* M */
+ { DA, DIT, END, END }, /* N */
+ { DA, DA, DAH, END }, /* O */
{ DI, DA, DA, DIT }, /* P */
{ DA, DA, DI, DAH }, /* Q */
- { DI, DA, DIT, end }, /* R */
- { DI, DI, DIT, end }, /* S */
- { DAH, end, end, end }, /* T */
- { DI, DI, DAH, end }, /* U */
+ { DI, DA, DIT, END }, /* R */
+ { DI, DI, DIT, END }, /* S */
+ { DAH, END, END, END }, /* T */
+ { DI, DI, DAH, END }, /* U */
{ DI, DI, DI, DAH }, /* V */
- { DI, DA, DAH, end }, /* W */
+ { DI, DA, DAH, END }, /* W */
{ DA, DI, DI, DAH }, /* X */
{ DA, DI, DA, DAH }, /* Y */
{ DA, DA, DI, DIT } /* Z */
};
+static const char numerals[10][5] = {
+ { DA, DA, DA, DA, DAH }, // 0
+ { DI, DA, DA, DA, DAH }, // 1
+ { DI, DI, DA, DA, DAH }, // 2
+ { DI, DI, DI, DA, DAH }, // 3
+ { DI, DI, DI, DI, DAH }, // 4
+ { DI, DI, DI, DI, DIT }, // 5
+ { DA, DI, DI, DI, DIT }, // 6
+ { DA, DA, DI, DI, DIT }, // 7
+ { DA, DA, DA, DI, DIT }, // 8
+ { DA, DA, DA, DA, DIT } // 9
+};
+
// constructor
FGMorse::FGMorse() {
// allocate and initialize sound samples
bool FGMorse::init() {
- int i, j;
+ // Make Low DIT
+ make_tone( lo_dit, LO_FREQUENCY, DIT_SIZE - COUNT_SIZE, DIT_SIZE,
+ TRANSITION_BYTES );
- // Make DIT
- for ( i = 0; i < TRANSITION_BYTES; ++i ) {
- float level = ( sin( (double) i * 2.0 * M_PI / (8000.0 / FREQUENCY)) )
- * ((double)i / TRANSITION_BYTES) / 2.0 + 0.5;
+ // Make High DIT
+ make_tone( hi_dit, HI_FREQUENCY, DIT_SIZE - COUNT_SIZE, DIT_SIZE,
+ TRANSITION_BYTES );
- /* Convert to unsigned byte */
- dit[ i ] = (unsigned char) ( level * 255.0 ) ;
- }
+ // Make Low DAH
+ make_tone( lo_dah, LO_FREQUENCY, DAH_SIZE - COUNT_SIZE, DAH_SIZE,
+ TRANSITION_BYTES );
- for ( i = TRANSITION_BYTES;
- i < DIT_SIZE - TRANSITION_BYTES - COUNT_SIZE; ++i ) {
- float level = ( sin( (double) i * 2.0 * M_PI / (8000.0 / FREQUENCY) ) )
- / 2.0 + 0.5;
+ // Make High DAH
+ make_tone( hi_dah, HI_FREQUENCY, DAH_SIZE - COUNT_SIZE, DAH_SIZE,
+ TRANSITION_BYTES );
- /* Convert to unsigned byte */
- dit[ i ] = (unsigned char) ( level * 255.0 ) ;
- }
- j = TRANSITION_BYTES;
- for ( i = DIT_SIZE - TRANSITION_BYTES - COUNT_SIZE;
- i < DIT_SIZE - COUNT_SIZE;
- ++i ) {
- float level = ( sin( (double) i * 2.0 * M_PI / (8000.0 / FREQUENCY) ) )
- * ((double)j / TRANSITION_BYTES) / 2.0 + 0.5;
- --j;
-
- /* Convert to unsigned byte */
- dit[ i ] = (unsigned char) ( level * 255.0 ) ;
- }
- for ( i = DIT_SIZE - COUNT_SIZE; i < DIT_SIZE; ++i ) {
- dit[ i ] = (unsigned char) ( 0.5 * 255.0 ) ;
+ // Make SPACE
+ int i;
+ for ( i = 0; i < SPACE_SIZE; ++i ) {
+ space[ i ] = (unsigned char) ( 0.5 * 255 ) ;
}
- // Make DAH
- for ( i = 0; i < TRANSITION_BYTES; ++i ) {
- float level = ( sin( (double) i * 2.0 * M_PI / (8000.0 / FREQUENCY) ) )
- * ((double)i / TRANSITION_BYTES) / 2.0 + 0.5;
+ return true;
+}
- /* Convert to unsigned byte */
- dah[ i ] = (unsigned char) ( level * 255.0 ) ;
- }
- for ( i = TRANSITION_BYTES;
- i < DAH_SIZE - TRANSITION_BYTES - COUNT_SIZE;
- ++i ) {
- float level = ( sin( (double) i * 2.0 * M_PI / (8000.0 / FREQUENCY) ) )
- / 2.0 + 0.5;
+// allocate and initialize sound samples
+bool FGMorse::cust_init(const int freq ) {
+ int i;
- /* Convert to unsigned byte */
- dah[ i ] = (unsigned char) ( level * 255.0 ) ;
- }
- j = TRANSITION_BYTES;
- for ( int i = DAH_SIZE - TRANSITION_BYTES - COUNT_SIZE;
- i < DAH_SIZE - COUNT_SIZE;
- ++i ) {
- float level = ( sin( (double) i * 2.0 * M_PI / (8000.0 / FREQUENCY) ) )
- * ((double)j / TRANSITION_BYTES) / 2.0 + 0.5;
- --j;
-
- /* Convert to unsigned byte */
- dah[ i ] = (unsigned char) ( level * 255.0 ) ;
- }
- for ( int i = DAH_SIZE - COUNT_SIZE; i < DAH_SIZE; ++i ) {
- dah[ i ] = (unsigned char) ( 0.5 * 255.0 ) ;
- }
+ // Make DIT
+ make_tone( cust_dit, freq, DIT_SIZE - COUNT_SIZE, DIT_SIZE,
+ TRANSITION_BYTES );
+
+ // Make DAH
+ make_tone( cust_dah, freq, DAH_SIZE - COUNT_SIZE, DAH_SIZE,
+ TRANSITION_BYTES );
// Make SPACE
- for ( int i = 0; i < SPACE_SIZE; ++i ) {
+ for ( i = 0; i < SPACE_SIZE; ++i ) {
space[ i ] = (unsigned char) ( 0.5 * 255 ) ;
}
}
-// make a FGSimpleSound morse code transmission for the specified string
-FGSimpleSound *FGMorse::make_ident( const string& id ) {
+// make a SGSoundSample morse code transmission for the specified string
+SGSoundSample *FGMorse::make_ident( const string& id, const int freq ) {
+
char *idptr = (char *)id.c_str();
int length = 0;
int i, j;
+ // 0. Select the frequency. If custom frequency, generate the
+ // sound fragments we need on the fly.
+ unsigned char *dit_ptr, *dah_ptr;
+
+ if ( freq == LO_FREQUENCY ) {
+ dit_ptr = lo_dit;
+ dah_ptr = lo_dah;
+ } else if ( freq == HI_FREQUENCY ) {
+ dit_ptr = hi_dit;
+ dah_ptr = hi_dah;
+ } else {
+ cust_init( freq );
+ dit_ptr = cust_dit;
+ dah_ptr = cust_dah;
+ }
+
// 1. Determine byte length of message
for ( i = 0; i < (int)id.length(); ++i ) {
if ( idptr[i] >= 'A' && idptr[i] <= 'Z' ) {
- char c = idptr[i] - 'A';
- for ( j = 0; j < 4 || alphabet[c][j] == end; ++j ) {
+ int c = (int)(idptr[i] - 'A');
+ for ( j = 0; j < 4 && alphabet[c][j] != END; ++j ) {
if ( alphabet[c][j] == DIT ) {
length += DIT_SIZE;
} else if ( alphabet[c][j] == DAH ) {
}
}
length += SPACE_SIZE;
+ } else if ( idptr[i] >= '0' && idptr[i] <= '9' ) {
+ int c = (int)(idptr[i] - '0');
+ for ( j = 0; j < 5; ++j) {
+ if ( numerals[c][j] == DIT ) {
+ length += DIT_SIZE;
+ } else if ( numerals[c][j] == DAH ) {
+ length += DAH_SIZE;
+ }
+ }
+ length += SPACE_SIZE;
} else {
// skip unknown character
}
}
+ // add 2x more space to the end of the string
+ length += 2 * SPACE_SIZE;
// 2. Allocate space for the message
- unsigned char *buffer = new unsigned char[length];
+ const unsigned char* buffer = (const unsigned char *)malloc(length);
// 3. Assemble the message;
- unsigned char *bufptr = buffer;
+ unsigned char *buf_ptr = (unsigned char*)buffer;
for ( i = 0; i < (int)id.length(); ++i ) {
if ( idptr[i] >= 'A' && idptr[i] <= 'Z' ) {
- char c = idptr[i] - 'A';
- for ( j = 0; j < 4 || alphabet[c][j] == end; ++j ) {
+ int c = (int)(idptr[i] - 'A');
+ for ( j = 0; j < 4 && alphabet[c][j] != END; ++j ) {
if ( alphabet[c][j] == DIT ) {
- memcpy( bufptr, dit, DIT_SIZE );
- bufptr += DIT_SIZE;
+ memcpy( buf_ptr, dit_ptr, DIT_SIZE );
+ buf_ptr += DIT_SIZE;
} else if ( alphabet[c][j] == DAH ) {
- memcpy( bufptr, dah, DAH_SIZE );
- bufptr += DAH_SIZE;
+ memcpy( buf_ptr, dah_ptr, DAH_SIZE );
+ buf_ptr += DAH_SIZE;
}
}
- memcpy( bufptr, space, SPACE_SIZE );
- bufptr += SPACE_SIZE;
+ memcpy( buf_ptr, space, SPACE_SIZE );
+ buf_ptr += SPACE_SIZE;
+ } else if ( idptr[i] >= '0' && idptr[i] <= '9' ) {
+ int c = (int)(idptr[i] - '0');
+ for ( j = 0; j < 5; ++j ) {
+ if ( numerals[c][j] == DIT ) {
+ memcpy( buf_ptr, dit_ptr, DIT_SIZE );
+ buf_ptr += DIT_SIZE;
+ } else if ( numerals[c][j] == DAH ) {
+ memcpy( buf_ptr, dah_ptr, DAH_SIZE );
+ buf_ptr += DAH_SIZE;
+ }
+ }
+ memcpy( buf_ptr, space, SPACE_SIZE );
+ buf_ptr += SPACE_SIZE;
} else {
// skip unknown character
}
}
+ memcpy( buf_ptr, space, SPACE_SIZE );
+ buf_ptr += SPACE_SIZE;
+ memcpy( buf_ptr, space, SPACE_SIZE );
+ buf_ptr += SPACE_SIZE;
// 4. create the simple sound and return
- FGSimpleSound *sample = new FGSimpleSound( buffer, length );
+ SGSoundSample *sample = new SGSoundSample( &buffer, length,
+ BYTES_PER_SECOND );
+
+ sample->set_reference_dist( 10.0 );
+ sample->set_max_dist( 20.0 );
return sample;
}
+
+FGMorse * FGMorse::_instance = NULL;
+
+FGMorse * FGMorse::instance()
+{
+ if( _instance == NULL ) {
+ _instance = new FGMorse();
+ _instance->init();
+ }
+ return _instance;
+}