1 // morse.cxx -- Morse code generation class
3 // Written by Curtis Olson, started March 2001.
5 // Copyright (C) 2001 Curtis L. Olson - http://www.flightgear.org/~curt
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
23 #include <simgear/constants.h>
29 static const char alphabet[26][4] = {
30 { DI, DAH, END, END }, /* A */
31 { DA, DI, DI, DIT }, /* B */
32 { DA, DI, DA, DIT }, /* C */
33 { DA, DI, DIT, END }, /* D */
34 { DIT, END, END, END }, /* E */
35 { DI, DI, DA, DIT }, /* F */
36 { DA, DA, DIT, END }, /* G */
37 { DI, DI, DI, DIT }, /* H */
38 { DI, DIT, END, END }, /* I */
39 { DI, DA, DA, DAH }, /* J */
40 { DA, DI, DAH, END }, /* K */
41 { DI, DA, DI, DIT }, /* L */
42 { DA, DAH, END, END }, /* M */
43 { DA, DIT, END, END }, /* N */
44 { DA, DA, DAH, END }, /* O */
45 { DI, DA, DA, DIT }, /* P */
46 { DA, DA, DI, DAH }, /* Q */
47 { DI, DA, DIT, END }, /* R */
48 { DI, DI, DIT, END }, /* S */
49 { DAH, END, END, END }, /* T */
50 { DI, DI, DAH, END }, /* U */
51 { DI, DI, DI, DAH }, /* V */
52 { DI, DA, DAH, END }, /* W */
53 { DA, DI, DI, DAH }, /* X */
54 { DA, DI, DA, DAH }, /* Y */
55 { DA, DA, DI, DIT } /* Z */
58 static const char numerals[10][5] = {
59 { DA, DA, DA, DA, DAH }, // 0
60 { DI, DA, DA, DA, DAH }, // 1
61 { DI, DI, DA, DA, DAH }, // 2
62 { DI, DI, DI, DA, DAH }, // 3
63 { DI, DI, DI, DI, DAH }, // 4
64 { DI, DI, DI, DI, DIT }, // 5
65 { DA, DI, DI, DI, DIT }, // 6
66 { DA, DA, DI, DI, DIT }, // 7
67 { DA, DA, DA, DI, DIT }, // 8
68 { DA, DA, DA, DA, DIT } // 9
81 // allocate and initialize sound samples
82 bool FGMorse::init() {
84 make_tone( lo_dit, LO_FREQUENCY, DIT_SIZE - COUNT_SIZE, DIT_SIZE,
88 make_tone( hi_dit, HI_FREQUENCY, DIT_SIZE - COUNT_SIZE, DIT_SIZE,
92 make_tone( lo_dah, LO_FREQUENCY, DAH_SIZE - COUNT_SIZE, DAH_SIZE,
96 make_tone( hi_dah, HI_FREQUENCY, DAH_SIZE - COUNT_SIZE, DAH_SIZE,
101 for ( i = 0; i < SPACE_SIZE; ++i ) {
102 space[ i ] = (unsigned char) ( 0.5 * 255 ) ;
109 // allocate and initialize sound samples
110 bool FGMorse::cust_init(const int freq ) {
114 make_tone( cust_dit, freq, DIT_SIZE - COUNT_SIZE, DIT_SIZE,
118 make_tone( cust_dah, freq, DAH_SIZE - COUNT_SIZE, DAH_SIZE,
122 for ( i = 0; i < SPACE_SIZE; ++i ) {
123 space[ i ] = (unsigned char) ( 0.5 * 255 ) ;
130 // make a SGSoundSample morse code transmission for the specified string
131 SGSoundSample *FGMorse::make_ident( const string& id, const int freq ) {
133 char *idptr = (char *)id.c_str();
138 // 0. Select the frequency. If custom frequency, generate the
139 // sound fragments we need on the fly.
140 unsigned char *dit_ptr, *dah_ptr;
142 if ( freq == LO_FREQUENCY ) {
145 } else if ( freq == HI_FREQUENCY ) {
154 // 1. Determine byte length of message
155 for ( i = 0; i < (int)id.length(); ++i ) {
156 if ( idptr[i] >= 'A' && idptr[i] <= 'Z' ) {
157 int c = (int)(idptr[i] - 'A');
158 for ( j = 0; j < 4 && alphabet[c][j] != END; ++j ) {
159 if ( alphabet[c][j] == DIT ) {
161 } else if ( alphabet[c][j] == DAH ) {
165 length += SPACE_SIZE;
166 } else if ( idptr[i] >= '0' && idptr[i] <= '9' ) {
167 int c = (int)(idptr[i] - '0');
168 for ( j = 0; j < 5; ++j) {
169 if ( numerals[c][j] == DIT ) {
171 } else if ( numerals[c][j] == DAH ) {
175 length += SPACE_SIZE;
177 // skip unknown character
180 // add 2x more space to the end of the string
181 length += 2 * SPACE_SIZE;
183 // 2. Allocate space for the message
184 const unsigned char* buffer = (const unsigned char *)malloc(length);
186 // 3. Assemble the message;
187 unsigned char *buf_ptr = (unsigned char*)buffer;
189 for ( i = 0; i < (int)id.length(); ++i ) {
190 if ( idptr[i] >= 'A' && idptr[i] <= 'Z' ) {
191 int c = (int)(idptr[i] - 'A');
192 for ( j = 0; j < 4 && alphabet[c][j] != END; ++j ) {
193 if ( alphabet[c][j] == DIT ) {
194 memcpy( buf_ptr, dit_ptr, DIT_SIZE );
196 } else if ( alphabet[c][j] == DAH ) {
197 memcpy( buf_ptr, dah_ptr, DAH_SIZE );
201 memcpy( buf_ptr, space, SPACE_SIZE );
202 buf_ptr += SPACE_SIZE;
203 } else if ( idptr[i] >= '0' && idptr[i] <= '9' ) {
204 int c = (int)(idptr[i] - '0');
205 for ( j = 0; j < 5; ++j ) {
206 if ( numerals[c][j] == DIT ) {
207 memcpy( buf_ptr, dit_ptr, DIT_SIZE );
209 } else if ( numerals[c][j] == DAH ) {
210 memcpy( buf_ptr, dah_ptr, DAH_SIZE );
214 memcpy( buf_ptr, space, SPACE_SIZE );
215 buf_ptr += SPACE_SIZE;
217 // skip unknown character
220 memcpy( buf_ptr, space, SPACE_SIZE );
221 buf_ptr += SPACE_SIZE;
222 memcpy( buf_ptr, space, SPACE_SIZE );
223 buf_ptr += SPACE_SIZE;
225 // 4. create the simple sound and return
226 SGSoundSample *sample = new SGSoundSample( &buffer, length,
229 sample->set_reference_dist( 10.0 );
230 sample->set_max_dist( 20.0 );
235 FGMorse * FGMorse::_instance = NULL;
237 FGMorse * FGMorse::instance()
239 if( _instance == NULL ) {
240 _instance = new FGMorse();