// $Id$
+#include <simgear/constants.h>
+
#include "morse.hxx"
}
-// allocate and initialize sound samples
-bool FGMorse::init() {
+// 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
+void make_tone( unsigned char *buf, int freq,
+ int len, int total_len, int trans_len )
+{
int i, j;
- // Make Low DIT
- for ( i = 0; i < TRANSITION_BYTES; ++i ) {
- float level = ( sin( (double) i * 2.0 * M_PI
- / (8000.0 / LO_FREQUENCY) ) )
- * ((double)i / TRANSITION_BYTES)
- / 2.0 + 0.5;
+ for ( i = 0; i < trans_len; ++i ) {
+ float level = ( sin( (double) i * 2.0 * SGD_PI / (8000.0 / freq) ) )
+ * ((double)i / trans_len) / 2.0 + 0.5;
/* Convert to unsigned byte */
- lo_dit[ i ] = (unsigned char) ( level * 255.0 ) ;
+ buf[ i ] = (unsigned char) ( level * 255.0 ) ;
}
- for ( i = TRANSITION_BYTES;
- i < DIT_SIZE - TRANSITION_BYTES - COUNT_SIZE; ++i ) {
- float level = ( sin( (double) i * 2.0 * M_PI
- / (8000.0 / LO_FREQUENCY) ) )
+ for ( i = trans_len; i < len - trans_len; ++i ) {
+ float level = ( sin( (double) i * 2.0 * SGD_PI / (8000.0 / freq) ) )
/ 2.0 + 0.5;
/* Convert to unsigned byte */
- lo_dit[ i ] = (unsigned char) ( level * 255.0 ) ;
+ buf[ 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 / LO_FREQUENCY) ) )
- * ((double)j / TRANSITION_BYTES) / 2.0 + 0.5;
+ j = trans_len;
+ for ( i = len - trans_len; i < len; ++i ) {
+ float level = ( sin( (double) i * 2.0 * SGD_PI / (8000.0 / freq) ) )
+ * ((double)j / trans_len) / 2.0 + 0.5;
--j;
/* Convert to unsigned byte */
- lo_dit[ i ] = (unsigned char) ( level * 255.0 ) ;
+ buf[ i ] = (unsigned char) ( level * 255.0 ) ;
}
- for ( i = DIT_SIZE - COUNT_SIZE; i < DIT_SIZE; ++i ) {
- lo_dit[ i ] = (unsigned char) ( 0.5 * 255.0 ) ;
- }
-
- // Make High DIT
- for ( i = 0; i < TRANSITION_BYTES; ++i ) {
- float level = ( sin( (double) i * 2.0 * M_PI
- / (8000.0 / HI_FREQUENCY)) )
- * ((double)i / TRANSITION_BYTES) / 2.0 + 0.5;
-
- /* Convert to unsigned byte */
- hi_dit[ i ] = (unsigned char) ( level * 255.0 ) ;
+ for ( i = len; i < total_len; ++i ) {
+ buf[ i ] = (unsigned char) ( 0.5 * 255.0 ) ;
}
+}
- for ( i = TRANSITION_BYTES;
- i < DIT_SIZE - TRANSITION_BYTES - COUNT_SIZE; ++i ) {
- float level = ( sin( (double) i * 2.0 * M_PI
- / (8000.0 / HI_FREQUENCY) ) )
- / 2.0 + 0.5;
- /* Convert to unsigned byte */
- hi_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 / HI_FREQUENCY) ) )
- * ((double)j / TRANSITION_BYTES) / 2.0 + 0.5;
- --j;
+// allocate and initialize sound samples
+bool FGMorse::init() {
+ // Make Low DIT
+ make_tone( lo_dit, LO_FREQUENCY, DIT_SIZE - COUNT_SIZE, DIT_SIZE,
+ TRANSITION_BYTES );
- /* Convert to unsigned byte */
- hi_dit[ i ] = (unsigned char) ( level * 255.0 ) ;
- }
- for ( i = DIT_SIZE - COUNT_SIZE; i < DIT_SIZE; ++i ) {
- hi_dit[ i ] = (unsigned char) ( 0.5 * 255.0 ) ;
- }
+ // Make High DIT
+ make_tone( hi_dit, HI_FREQUENCY, DIT_SIZE - COUNT_SIZE, DIT_SIZE,
+ TRANSITION_BYTES );
// Make Low DAH
- for ( i = 0; i < TRANSITION_BYTES; ++i ) {
- float level = ( sin( (double) i * 2.0 * M_PI
- / (8000.0 / LO_FREQUENCY) ) )
- * ((double)i / TRANSITION_BYTES) / 2.0 + 0.5;
-
- /* Convert to unsigned byte */
- lo_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 / LO_FREQUENCY) ) )
- / 2.0 + 0.5;
-
- /* Convert to unsigned byte */
- lo_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 / LO_FREQUENCY) ) )
- * ((double)j / TRANSITION_BYTES) / 2.0 + 0.5;
- --j;
-
- /* Convert to unsigned byte */
- lo_dah[ i ] = (unsigned char) ( level * 255.0 ) ;
- }
- for ( int i = DAH_SIZE - COUNT_SIZE; i < DAH_SIZE; ++i ) {
- lo_dah[ i ] = (unsigned char) ( 0.5 * 255.0 ) ;
- }
+ make_tone( lo_dah, LO_FREQUENCY, DAH_SIZE - COUNT_SIZE, DAH_SIZE,
+ TRANSITION_BYTES );
// Make High DAH
- for ( i = 0; i < TRANSITION_BYTES; ++i ) {
- float level = ( sin( (double) i * 2.0 * M_PI
- / (8000.0 / HI_FREQUENCY) ) )
- * ((double)i / TRANSITION_BYTES) / 2.0 + 0.5;
-
- /* Convert to unsigned byte */
- hi_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 / HI_FREQUENCY) ) )
- / 2.0 + 0.5;
-
- /* Convert to unsigned byte */
- hi_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 / HI_FREQUENCY) ) )
- * ((double)j / TRANSITION_BYTES) / 2.0 + 0.5;
- --j;
-
- /* Convert to unsigned byte */
- hi_dah[ i ] = (unsigned char) ( level * 255.0 ) ;
- }
- for ( int i = DAH_SIZE - COUNT_SIZE; i < DAH_SIZE; ++i ) {
- hi_dah[ i ] = (unsigned char) ( 0.5 * 255.0 ) ;
- }
+ make_tone( hi_dah, HI_FREQUENCY, DAH_SIZE - COUNT_SIZE, DAH_SIZE,
+ TRANSITION_BYTES );
// Make SPACE
- for ( int i = 0; i < SPACE_SIZE; ++i ) {
+ int i;
+ for ( i = 0; i < SPACE_SIZE; ++i ) {
space[ i ] = (unsigned char) ( 0.5 * 255 ) ;
}
// allocate and initialize sound samples
bool FGMorse::cust_init(const int freq ) {
- int i, j;
+ int i;
// Make DIT
- for ( i = 0; i < TRANSITION_BYTES; ++i ) {
- float level = ( sin( (double) i * 2.0 * M_PI / (8000.0 / freq)) )
- * ((double)i / TRANSITION_BYTES) / 2.0 + 0.5;
-
- /* Convert to unsigned byte */
- cust_dit[ i ] = (unsigned char) ( level * 255.0 ) ;
- }
-
- for ( i = TRANSITION_BYTES;
- i < DIT_SIZE - TRANSITION_BYTES - COUNT_SIZE; ++i ) {
- float level = ( sin( (double) i * 2.0 * M_PI / (8000.0 / freq) ) )
- / 2.0 + 0.5;
-
- /* Convert to unsigned byte */
- cust_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 / freq) ) )
- * ((double)j / TRANSITION_BYTES) / 2.0 + 0.5;
- --j;
-
- /* Convert to unsigned byte */
- cust_dit[ i ] = (unsigned char) ( level * 255.0 ) ;
- }
- for ( i = DIT_SIZE - COUNT_SIZE; i < DIT_SIZE; ++i ) {
- cust_dit[ i ] = (unsigned char) ( 0.5 * 255.0 ) ;
- }
+ make_tone( cust_dit, freq, DIT_SIZE - COUNT_SIZE, DIT_SIZE,
+ TRANSITION_BYTES );
// Make DAH
- for ( i = 0; i < TRANSITION_BYTES; ++i ) {
- float level = ( sin( (double) i * 2.0 * M_PI / (8000.0 / freq) ) )
- * ((double)i / TRANSITION_BYTES) / 2.0 + 0.5;
-
- /* Convert to unsigned byte */
- cust_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 / freq) ) )
- / 2.0 + 0.5;
-
- /* Convert to unsigned byte */
- cust_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 / freq) ) )
- * ((double)j / TRANSITION_BYTES) / 2.0 + 0.5;
- --j;
-
- /* Convert to unsigned byte */
- cust_dah[ i ] = (unsigned char) ( level * 255.0 ) ;
- }
- for ( int i = DAH_SIZE - COUNT_SIZE; i < DAH_SIZE; ++i ) {
- cust_dah[ i ] = (unsigned char) ( 0.5 * 255.0 ) ;
- }
+ 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 ) ;
}
projects / flightgear.git / blobdiff