68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
||
|
|
// Tyler Perkins
|
||
|
|
// 12-30-20
|
||
|
|
// Testing command line audio
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <math.h>
|
||
|
|
|
||
|
|
int main(int argc, char** argv){
|
||
|
|
if(argc != 1){
|
||
|
|
printf("Usage: %s\n", argv[0]);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
//sawtooth wave
|
||
|
|
for(int t=0, osc=0; t<8000; t++, osc += 14){
|
||
|
|
putchar(osc);
|
||
|
|
}
|
||
|
|
|
||
|
|
//square wave
|
||
|
|
for(int t=0, osc=0; t<8000; t++, osc += 14){
|
||
|
|
putchar(osc & 0x80);
|
||
|
|
}
|
||
|
|
|
||
|
|
//sine wave
|
||
|
|
for(int t=0, osc=0; t<8000; t++, osc += 14){
|
||
|
|
putchar(127 * sin(osc/255.0*2*3.1415) + 128);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* kinda bass guitar?
|
||
|
|
*
|
||
|
|
* The idea here is an array full of random data, with
|
||
|
|
* an array size equal to the period of the wave
|
||
|
|
* (for 440 its ~18) then loop the array.
|
||
|
|
* Then we average out the current value and next one
|
||
|
|
* Till we get a faded noise to silence
|
||
|
|
*
|
||
|
|
* Pretty cool ngl
|
||
|
|
*/
|
||
|
|
|
||
|
|
unsigned char a[18];
|
||
|
|
|
||
|
|
//init the array with random data
|
||
|
|
FILE *fp;
|
||
|
|
fp = fopen("/dev/random", "r");
|
||
|
|
if(fp == NULL){
|
||
|
|
printf("Couldnt open random stream!\n");
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
if(fgets(a,sizeof(a),fp)==NULL){
|
||
|
|
printf("Failed to read the random stream!\n");
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
fclose(fp);
|
||
|
|
|
||
|
|
//play the bass guitar
|
||
|
|
for(int t=0;t<8000;t++){
|
||
|
|
int i = t % sizeof(a);
|
||
|
|
int j = (t+1) % sizeof(a);
|
||
|
|
putchar(a[i] = (a[i] + a[j])/2);
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|