beat_test.c

/********************************
 *  Author:     Un1XX388         *
 *  Date:       7/13/2016        *
 *  Purpose:    Play a beat.     *
 ********************************/

  /****************************/
 /**    System Include(s)   **/
/****************************/
#include <stdio.h>
#include <time.h>

  /********************/
 /**    Constant(s) **/
/********************/
// Beats per second (BPS)
#define BPS 8
// How many beats the riff lasts for.
#define RIFF_LEN 48

  /****************/
 /**    Main    **/
/****************/
int main(int argc, char *argv[]){
      /***************/
     /* Variable(s) */
    /***************/
    // Used to keep track of the beat.
    struct timespec tim, tim2;
    // 1/8 sec beat.
    tim.tv_sec = 0, tim.tv_nsec = 1000000000L/BPS;
    // Used for iteration.
    int i;

    // Brief error checking.
    if(argc > 1)
        printf("Command line arguments not supported. Extra input ignored.\n");

    // Determines how long beat plays.
    for(i=7; i<RIFF_LEN; i++){
        // Each case has two print statements in order to make screen and audio output line up.
        switch(i%10){
            case 8:
                printf("\a\n");
                printf("1");
                break;
            case 0:
                printf("\a\n");
                printf("2");
                break;
            case 2:
                printf("\a\n");
                printf("3");
                break;
            case 4:
                printf("\a\n");
                printf("4.1");
                break;
            case 5:
                printf("\a\n");
                printf("4.2");
                break;
            case 6:
                printf("\a\n");
                printf("4.3");
                break;
            case 7:
                printf("\n****");
                break;
            default:
                printf("...\n");
        }

        // Waits for amount of time set of top of main.
        nanosleep(&tim, &tim2);
    }

    // My lazy way of fixing formatting problem.
    printf("\n");

    return 0;                                       // Return
}// End of main() function.