3836cl1.orig100600 1061 330 2410 7035665040 11251 0ustar mlrljedit#include #include #include #include #include int main(void) { unsigned short int wave[44100]; /* our wavetable */ int c; /* a counter */ int out; /* audio out */ /* open /dev/dsp for write only */ out = open("/dev/dsp",O_WRONLY); /* now we use ioctl to set audio quality */ c=16; /* 16 bits */ ioctl(out,SOUND_PCM_WRITE_BITS,&c); c=1; /* 1 channel */ ioctl(out,SOUND_PCM_WRITE_CHANNELS,&c); c=44100; /* 44.1KHz */ ioctl(out,SOUND_PCM_WRITE_RATE,&c); /* this generates the wavetable of our sines * it's standard trig, so play around with * whatever crazy equations you want to hear! */ for (c=0; c<44100; c++) { wave[c] =8000*sin(220*2*M_PI*(c+13)/44100); wave[c]+=7000*sin(277*2*M_PI*(c+29)/44100); wave[c]+=6000*sin(330*2*M_PI*(c+41)/44100); wave[c]+=5000*sin(440*2*M_PI*(c+67)/44100); } /* now we write the wavetable to /dev/dsp * as though writing to a simple file * we'll loop for 5 seconds of sheer joy */ for (c=0; c<5; c++) write(out, wave, sizeof(wave)); close(out); /* close /dev/dsp ! */ return 0; /* satisfy gcc */ } @side:This listing is available by anonymous download in the file ftp://ftp.ssc.com/pub/lj/listings/issue71/3638.tgz.