//
// Programmer:    Craig Stuart Sapp <craig@ccrma.stanford.edu>
// Creation Date: Fri Dec 18 23:05:42 PST 1998
// Last Modified: Thu Dec 24 15:10:29 PST 1998
// Filename:      ...linuxmidi/output/playnotes.c
// Syntax:        C
// $Smake:        gcc -O3 -Wall -o %b %f && strip %b
//

#include <linux/soundcard.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>


// global variables:
int         seqfd = -1;               // sequencer file descriptor
const char* dev = "/dev/sequencer";   // name of sequencer device
int         status;                   // for error checking
int         device = 0;               // for selecting which MIDI output to use


// function declarations:
void playnotes(void);


int main(int argc, char** argv) {
   int numMidi = 0;                   // number of available MIDI outputs

   seqfd = open(dev, O_WRONLY, 0);
   if (seqfd < 0) {
      printf("Error: cannot open %s\n", dev);
      exit(1);
   }

   if (argc >= 2) {
      device = argv[1][0] - '0';
   }

   status = ioctl(seqfd, SNDCTL_SEQ_NRMIDIS, &numMidi);
   if (status != 0) {
      printf("Error: cannot access MIDI devices on soundcard\n");
      exit(1);
   }
   printf("\nThere are: %d MIDI output devices available\n", numMidi);
   if (device >= numMidi) {
      printf("You specified an invalid MIDI device\n");
      exit(1);
   }

   playnotes();

   close(seqfd);
   return 0;
}


void playnotes(void) {
   int userInput = 0;
   unsigned char outpacket[12];

   outpacket[0] = SEQ_MIDIPUTC;
   outpacket[1] = 0x90;              // note-on command
   outpacket[2] = device;
   outpacket[3] = 0;

   outpacket[4] = SEQ_MIDIPUTC;
   // outpacket[5] will be the keynumber
   outpacket[6] = device;
   outpacket[7] = 0;

   outpacket[8] = SEQ_MIDIPUTC;
   outpacket[9] = 127;              // attack velocity
   outpacket[10] = device;
   outpacket[11] = 0;

   printf("Device set to: %d\n", device);
   printf("Enter a key number larger than 127 to exit\n");

   while (userInput < 128) {
      printf("Enter note number to send out MIDI port: ");
      scanf("%d",&userInput);
      if (userInput < 128 && userInput >= 0) {
         outpacket[5] = userInput;
         write(seqfd, outpacket, 12);
      }
   }

}