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user_io.cpp
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user_io.cpp
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#include <stdio.h>
#include <string.h> /* memset() */
#include <stdbool.h> /* type bool */
#include <unistd.h> /* for usleep(ms) */
#include "key_tables.h" /* key to freq functions */
#include "synth.h" /* Class Synth */
#include "main.h"
#if(USE_NCURSES)
#include <ncurses.h> /* This library is for getting input without hitting return */
/* Ncurses user I/O */
void user_io_ncurses(Synth *ps)
{
/* Initialize ncurses
* to permit interactive character input
*
* ncurses loop waits for key press
* If valid key, then initialize Tone structure
* and refresh ncurses display buffer
*/
initscr(); /* Start curses mode */
cbreak(); /* Line buffering disabled */
noecho(); /* Comment this out if you want to echo characters when typing */
printw("Welcome to my synthesizer!\n"); /* line 0 */
printw("Keyboard to piano key mapping is:\n");
printw("wer yu opl -> F3# to A4#\n");
printw("asdfghjkl;\' -> F3 to B4\n");
printw("'.' to stop playing oldest tone\n");
printw("SpaceBar to quit\n"); /* line 5 */
printw("\n"); /* line 6 is blank for now */
printw("Key: "); /* line 7 */
refresh();
char ch = '\0'; /* Init ch to null character */
while (1) {
char msg[32];
ch = getch(); // wait for next keypress
if (ch == ' ') {
break; // quit if space
}
else if (ch == '.') {
/* remove key from voicing keys */
ps->cmd = CMD_RM_KEY;
sprintf(msg, "Removed key. New key: ");
/* wait for callback to execute command */
while (ps->cmd > 0)
usleep(20);
}
else if ( !valid_key((int)ch) ) {
/* not a valid synth key */
sprintf(msg, "Invalid key. New key: ");
}
else {
/* add key to voicing keys */
ps->new_freq = key2freq(ch);
ps->cmd = CMD_ADD_KEY;
sprintf(msg, "Key %1c %3.0f, New key: ", ch, ps->new_freq);
/* wait for callback to execute command */
while (ps->cmd > 0)
usleep(20);
}
/* print key list on line 7 */
mvprintw(6, 0, "%d voicing", ps->num_keys);
for (int i=0; i<KEYS_VOICED; i++) {
mvprintw(7, 10+4*i, " %c", (char)ps->tone[i].key);
}
mvprintw(7, 0, "%s", msg);
refresh(); //display NCurses screen buffer on terminal screen
}
endwin();
}
#else
/* fgets() and printf() user I/O */
#define LEN_STR 80
/* Clears screen using ANSI escape sequences. */
void clear()
{
printf("\033[2J");
printf("\033[%d;%dH", 0, 0);
}
void print_info(Synth *ps, char *msg)
{
/* User I/O using printf() and getchar() */
clear();
printf("Welcome to my synthesizer!\n"); /* line 0 */
printf("Keyboard to piano key mapping is:\n");
printf("wer yu opl -> F3# to A4#\n");
printf("asdfghjkl;\' -> F3 to B4\n");
printf("'.' to stop playing oldest tone\n");
printf("'z' to transpose UP 1 octave\n");
printf("'x' to transpose DOWN 1 octave\n");
printf("SpaceBar to quit\n"); /* line 6 */
if (ps->num_keys == 0) {
printf("\n"); /* line 7 is blank for now */
}
else {
/* print key list on line 7 */
printf("%d voicing", ps->num_keys);
for (int i=0; i<KEYS_VOICED; i++) {
printf(" %c", (char)ps->tone[i].key);
}
printf("\n");
}
printf("%s", msg); /* line 8 */
fflush(stdout);
}
void user_io_plain(Synth *ps)
{
char in_str[LEN_STR]; /* user input string */
char msg[LEN_STR];
print_info(ps, "Press key(s) and Enter: ");
bool done = false;
while ( !done ) {
/* read input line, including trailing \n */
fgets(in_str, LEN_STR, stdin); // wait for input
int n = strlen(in_str)-1; //don't process \n key
for (int i=0; i<n; i++) {
if (in_str[i] == ' ') {
done = true;
break; // break out of for loop and quit while loop
}
else if (in_str[i] == '.') {
/* remove key from voicing keys */
ps->cmd = CMD_RM_KEY;
sprintf(msg, "Removed key. New key: ");
/* wait for callback to execute command */
while (ps->cmd > 0)
usleep(20);
}
else if (in_str[i] == 'z')
{
/*initialize the shifting octave index*/
init_plus();
octave_shift();
reset();
}
else if (in_str[i] == 'x')
{
init_minus();
octave_shift();
reset();
}
// else if (in_str[i] == 'c')
// {
// init_ori();
// octave_shift();
// }
else if ( !valid_key((int)in_str[i]) ) {
/* not a valid synth key */
sprintf(msg, "Invalid key. New key: ");
}
else {
/* add key to voicing keys */
octave_shift();
ps->new_freq = key2freq(in_str[i]);
ps->cmd = CMD_ADD_KEY;
sprintf(msg, "Key %1c %3.0f, New key: ", in_str[i], ps->new_freq);
/* wait for callback to execute command */
while (ps->cmd > 0)
usleep(20);
}
}
print_info(ps, msg);
}
clear();
}
#endif