void generate_tone()
{
int nsamples;
GR_EVENT event;
int freq = 0;
// struct audio_buf_info info;
// char buf[20];
while(!generator_paused) {
if(generator_freq != freq) {
freq = generator_freq;
nsamples = make_wave_buffer(generator_freq);
//add wave types here - tbd
}
// we need to use ioctl to get available space and ensure we dont write too much to improve response
// times while changing freq/notes. to be done
// ioctl(dspz.dsp, SNDCTL_DSP_GETOSPACE, &info);
// sprintf(buf, "f:%d, s/f: %d", info.fragstotal, info.fragsize);
// sprintf(buf, "afs: %d, ab: %d", info.fragments, info.bytes);
// generator_draw_text(buf);
dsp_write( &dspz, wave_buffer, sizeof(short)*nsamples); // dont write block
if(GrPeekEvent(&event)) {
repeat:
GrGetNextEventTimeout(&event, 1000);
if (event.type != GR_EVENT_TYPE_TIMEOUT) {
pz_event_handler(&event);
if (GrPeekEvent(&event))
goto repeat;
}
}
}
if (generator_quit_app) // menu button in the middle of a play
generator_button_menu();//get out of the app
// better way to get out of the event handler - tbd
}
int winwave_play_alloc(struct auplay_st **stp, const struct auplay *ap,
struct auplay_prm *prm, const char *device,
auplay_write_h *wh, void *arg)
{
struct auplay_st *st;
int i, err;
if (!stp || !ap || !prm)
return EINVAL;
st = mem_zalloc(sizeof(*st), auplay_destructor);
if (!st)
return ENOMEM;
st->ap = ap;
st->wh = wh;
st->arg = arg;
err = write_stream_open(st, prm, find_dev(device));
if (err)
goto out;
/* The write runs at 100ms intervals
* prepare enough buffers to suite its needs
*/
for (i = 0; i < 5; i++)
dsp_write(st);
out:
if (err)
mem_deref(st);
else
*stp = st;
return err;
}
void dtmf_play( dsp_st *dspz, char key )
{
int bp;
int f1p = 0;
int f2p = 0;
int freq1 = F_0;
int freq2 = F_0;
int ontime = 66;
int nsamps = 44100;
int ntimes = 1;
int c;
short * buf;
switch( key ) {
case( 'c' ):
case( 'r' ):
case( 'b' ):
dtmf_play( dspz, 'S' ); /* trigger 2600hz wink */
break;
}
/* freq 1 */
switch( key ) {
case( '1' ):
case( '2' ):
case( '3' ):
case( 'A' ):
freq1 = F_697;
break;
case( '4' ):
case( '5' ):
case( '6' ):
case( 'B' ):
freq1 = F_770;
break;
case( '7' ):
case( '8' ):
case( '9' ):
case( 'C' ):
freq1 = F_852;
break;
case( '*' ):
case( '0' ):
case( '#' ):
case( 'D' ):
freq1 = F_941;
break;
case( 's' ):
case( 'S' ):
freq1 = F_2600;
break;
case( 't' ):
freq1 = F_1850;
break;
case( 'n' ):
case( 'd' ):
case( 'q' ):
freq1 = F_700;
break;
case( 'c' ):
case( 'b' ):
freq1 = F_700;
break;
case( 'r' ):
freq1 = F_1100;
break;
}
/* freq 2 */
switch( key ) {
case( '1' ):
case( '4' ):
case( '7' ):
case( '*' ):
freq2 = F_1209;
break;
case( '2' ):
case( '5' ):
case( '8' ):
case( '0' ):
freq2 = F_1336;
break;
case( '3' ):
case( '6' ):
case( '9' ):
case( '#' ):
freq2 = F_1477;
break;
case( 'A' ):
case( 'B' ):
case( 'C' ):
case( 'D' ):
freq2 = F_1633;
break;
case( 's' ):
case( 'S' ):
freq2 = F_0;
break;
case( 't' ):
freq2 = F_0;
break;
case( 'n' ):
case( 'd' ):
case( 'q' ):
freq2 = F_0;
break;
case( 'c' ):
freq2 = F_1100;
break;
case( 'r' ):
case( 'b' ):
freq2 = F_1700;
break;
}
/* adjust timings */
if( key == 'q' ) ontime = 33;
if( key == ',' ) ontime = 250; /* pause */
if( key == 'A' || key == 'B' || key == 'C' || key == 'D' ) ontime = 500;
if( key == 's' || key == 't' ) ontime = 500;
if( key == 'S' ) ontime = 90;
if( key == 'c' || key == 'r' || key == 'b' ) ontime = 1000;
/* adjust repeats */
if( key == 'q' ) ntimes = 5;
if( key == 'd' ) ntimes = 2;
nsamps = ontime * 44100 / 1000;
buf = (short *)malloc( sizeof( short ) * nsamps );
for( c=0 ; c<ntimes ; c++ )
{
// play the two tones
for( bp = 0 ; bp < nsamps ; bp++ )
{
/* copy over and add the two waveforms */
buf[bp] = (waveforms[freq1].samples[f1p++])
+ (waveforms[freq2].samples[f2p++]);
buf[bp] = buf[bp] << 6;
/* adjust sample pointers */
if( f1p >= waveforms[freq1].nsamples ) f1p = 0;
if( f2p >= waveforms[freq2].nsamples ) f2p = 0;
}
#ifdef __linux__
dsp_write( dspz, buf, nsamps*sizeof(short));
#endif
/* zero it out */
for( bp=0 ; bp < nsamps ; bp++ ) buf[bp] = 0;
if( key == 'S' ) {
nsamps = nsamps * 2 / 3; /* 60ms instead of 90 */
}
#ifdef __linux__
dsp_write( dspz, buf, nsamps*sizeof(short));
#endif
}
free( buf );
}