ref: a007855f2e510b6bac417fbf0d21527e54158466
parent: b657fb427237c04806baab51f72bbf971d32339f
author: glenda <glenda@9front.local>
date: Thu Nov 26 22:09:47 EST 2020
initial commit
--- /dev/null
+++ b/balance.c
@@ -1,0 +1,93 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include <event.h>
+#include <thread.h>
+
+#define RATE 44100
+
+int rate;
+double bal;
+Point c;
+
+void
+balance(unsigned char *buf, int len)
+{+ short l, r;
+ int i;
+
+ for(i = 0; i < len; i += 4){+ l = buf[i+0] | (buf[i+1] << 8);
+ r = buf[i+2] | (buf[i+3] << 8);
+
+ l *= 1.0 - bal;
+ r *= 1.0 + bal;
+
+ buf[i+0] = l & 0xFF;
+ buf[i+1] = (l >> 8) & 0xFF;
+ buf[i+2] = r & 0xFF;
+ buf[i+3] = (r >> 8) & 0xFF;
+ }
+}
+
+void
+doproc(void *unused)
+{+ unsigned char *buf = malloc(rate * 4);
+ int r;
+
+ while((r = read(0, buf, rate * 4)) > 0){+ balance(buf, r);
+ write(1, buf, r);
+ }
+}
+
+void
+redraw(Image *screen)
+{+ int x = c.x + (c.x * bal);
+
+ draw(screen, screen->r, display->white, nil, ZP);
+
+ draw(screen, Rect(screen->r.min.x + x - 1, screen->r.min.y,
+ screen->r.min.x + x + 1, screen->r.max.y),
+ display->black, nil, ZP);
+}
+
+void
+eresized(int new)
+{+ if(new && getwindow(display, Refnone) < 0)
+ fprint(2,"can't reattach to window");
+ c = divpt(subpt(screen->r.max, screen->r.min), 2);
+ redraw(screen);
+}
+
+void
+threadmain(int argc, char **argv)
+{+ Mouse m;
+ Point xy;
+ rate = RATE;
+ bal = 0.0;
+
+ if (argc > 1)
+ rate = atoi(argv[1]);
+
+ if(initdraw(0, 0, "balance") < 0)
+ sysfatal("initdraw: %r");+ einit(Emouse);
+
+ eresized(0);
+ proccreate(doproc, nil, mainstacksize);
+
+ for(;;m = emouse()){+ if(m.buttons & 1){+ xy = subpt(m.xy, screen->r.min);
+
+ bal = (xy.x - c.x) / (double)c.x;
+
+ redraw(screen);
+ }
+ }
+}
--- /dev/null
+++ b/monome.c
@@ -1,0 +1,168 @@
+#include <u.h>
+#include <libc.h>
+#include <thread.h>
+#include <draw.h>
+#include <event.h>
+#include <keyboard.h>
+#include <fcall.h>
+#include <9p.h>
+
+int mainstacksize = 0x10000;
+
+Image *back;
+Rectangle buttons[16][16];
+char buttonstate[16][16];
+int redrawfds[2];
+
+void
+redraw(Image *screen)
+{+ int i, j;
+
+ draw(screen, screen->r, back, nil, ZP);
+
+ for(i = 0; i < 16; i++)
+ for(j = 0; j < 16; j++)
+ draw(screen, rectaddpt(buttons[i][j], screen->r.min),
+ buttonstate[i][j]? display->white: display->black,
+ nil, ZP);
+}
+
+void
+resize(void)
+{+ int fd = open("/dev/wctl", OWRITE);+ if(fd >= 0){+ fprint(fd, "resize -dx 650 -dy 650\n");
+ close(fd);
+ }
+}
+
+void
+eresized(int new)
+{+ if(new && getwindow(display, Refnone) < 0)
+ fprint(2,"can't reattach to window");
+ resize();
+ redraw(screen);
+}
+
+void
+fswrite(Req *r)
+{+ int i, j, k;
+ int count;
+
+ count = r->ifcall.count;
+
+ if (count < (6*16)) {+ respond(r, "short write");
+ return;
+ }
+
+ for(i = 0; i < 16; i++){+ k = atoi(&r->ifcall.data[i*6]);
+
+ for(j = 0; j < 16; j++){+ buttonstate[i][j] = (k & (1<<j))? 1: 0;
+ }
+ }
+
+ write(redrawfds[1], "\0", 1);
+
+ r->ofcall.count = count;
+ respond(r, nil);
+}
+
+void
+fsread(Req *r)
+{+ int i, j, k;
+ int count, off;
+ char buf[6*16+2];
+
+ count = r->ifcall.count;
+ off = r->ifcall.offset % (6*16+2);
+
+ if (count == 0) {+ r->ofcall.count = 0;
+ respond(r, nil);
+ return;
+ }
+
+ for(i = 0; i < 16; i++){+ k = 0;
+ for(j = 0; j < 16; j++){+ k |= buttonstate[i][j] << j;
+ }
+
+ sprint(&buf[i*6], "%5d ", k);
+ }
+
+ buf[6*16+0] = '\n';
+ buf[6*16+1] = '\0';
+
+ if (count > (6*16+2))
+ count = 6*16+2;
+
+ memcpy(r->ofcall.data, buf + off, count);
+ r->ofcall.count = count;
+
+ respond(r, nil);
+}
+
+Srv fs = {+ .write = fswrite,
+ .read = fsread,
+};
+
+void
+threadmain(int argc, char **argv)
+{+ int i, j;
+ Event e;
+ Point xy;
+ int key;
+
+ if(initdraw(0, 0, "monome") < 0)
+ sysfatal("initdraw: %r");+
+ back = allocimage(display, Rect(0,0,1,1), CMAP8, 1, 0x777777FF);
+ if (back == nil)
+ sysfatal("allocimage: %r");+ for(i = 0; i < 16; i++) {+ memset(buttonstate[i], '\0', 16);
+ for(j = 0; j < 16; j++)
+ buttons[i][j] = insetrect(Rect(i*40, j*40, (i+1)*40, (j+1)*40), 3);
+ }
+ eresized(0);
+ einit(Emouse|Ekeyboard);
+ pipe(redrawfds);
+ estart(0, redrawfds[0], 1);
+
+ fs.tree = alloctree(nil, nil, DMDIR|0777, nil);
+ createfile(fs.tree->root, "buttons", nil, 0666, nil);
+ threadpostmountsrv(&fs, "monome", "/mnt/monome", 0);
+
+ for(;;){+READ:
+ redraw(screen);
+ switch(event(&e)){+ case Emouse:
+ if(e.mouse.buttons & 1){+ xy = subpt(e.mouse.xy, screen->r.min);
+ for(i = 0; i < 16; i++)
+ for(j = 0; j < 16; j++)
+ if(ptinrect(xy, buttons[i][j])){+ buttonstate[i][j] = !buttonstate[i][j];
+ goto READ;
+ }
+ }
+ break;
+ case Ekeyboard:
+ if(e.kbdc == Kdel)
+ threadexitsall(nil);
+ break;
+ }
+ }
+}
--- /dev/null
+++ b/reverb.c
@@ -1,0 +1,111 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include <event.h>
+#include <thread.h>
+
+#define RATE 44100
+
+int rate;
+double decay;
+int delay;
+Point c;
+
+void
+reverb(unsigned char *buf, short *tmp, int len)
+{+ short l, r;
+ int i;
+ int dur = delay;
+
+ for(i = 0; i < len; i += 4){+ l = buf[i+0] | (buf[i+1] << 8);
+ r = buf[i+2] | (buf[i+3] << 8);
+
+ l += tmp[(i/2+0+dur)%len] * decay;
+ r += tmp[(i/2+1+dur)%len] * decay;
+
+ tmp[(i/2+0)%len] = l;
+ tmp[(i/2+1)%len] = r;
+
+ buf[i+0] = l & 0xFF;
+ buf[i+1] = (l >> 8) & 0xFF;
+ buf[i+2] = r & 0xFF;
+ buf[i+3] = (r >> 8) & 0xFF;
+ }
+}
+
+void
+doproc(void *unused)
+{+ unsigned char *buf = malloc(rate * 4);
+ short *tmp = malloc(rate * 2);
+ int r;
+
+ memset(tmp, 0, rate * 2);
+
+ while((r = read(0, buf, rate * 4)) > 0){+ reverb(buf, tmp, r);
+ write(1, buf, r);
+ }
+}
+
+void
+redraw(Image *screen)
+{+ int x = delay;
+
+ draw(screen, screen->r, display->white, nil, ZP);
+
+ draw(screen, Rect(screen->r.min.x + x - 1, screen->r.min.y,
+ screen->r.min.x + x + 1, screen->r.max.y - Dy(screen->r)/2),
+ display->black, nil, ZP);
+
+ x = decay * Dx(screen->r);
+
+ draw(screen, Rect(screen->r.min.x + x - 1, screen->r.min.y + Dy(screen->r)/2,
+ screen->r.min.x + x + 1, screen->r.max.y),
+ display->black, nil, ZP);
+}
+
+void
+eresized(int new)
+{+ if(new && getwindow(display, Refnone) < 0)
+ fprint(2,"can't reattach to window");
+ c = divpt(subpt(screen->r.max, screen->r.min), 2);
+ redraw(screen);
+}
+
+void
+threadmain(int argc, char **argv)
+{+ Mouse m;
+ Point xy;
+ rate = RATE;
+ delay = 0;
+ decay = 0.0;
+
+ if (argc > 1)
+ rate = atoi(argv[1]);
+
+ if(initdraw(0, 0, "reverb") < 0)
+ sysfatal("initdraw: %r");+ einit(Emouse);
+
+ eresized(0);
+ proccreate(doproc, nil, mainstacksize);
+
+ for(;;m = emouse()){+ if(m.buttons & 1){+ xy = subpt(m.xy, screen->r.min);
+
+ if (xy.y > c.y)
+ decay = xy.x / (double)Dx(screen->r);
+ else
+ delay = xy.x;
+
+ redraw(screen);
+ }
+ }
+}
--- /dev/null
+++ b/volume.c
@@ -1,0 +1,93 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include <event.h>
+#include <thread.h>
+
+#define RATE 44100
+
+int rate;
+double vol;
+Point c;
+
+void
+volume(unsigned char *buf, int len)
+{+ short l, r;
+ int i;
+
+ for(i = 0; i < len; i += 4){+ l = buf[i+0] | (buf[i+1] << 8);
+ r = buf[i+2] | (buf[i+3] << 8);
+
+ l *= vol;
+ r *= vol;
+
+ buf[i+0] = l & 0xFF;
+ buf[i+1] = (l >> 8) & 0xFF;
+ buf[i+2] = r & 0xFF;
+ buf[i+3] = (r >> 8) & 0xFF;
+ }
+}
+
+void
+doproc(void *unused)
+{+ unsigned char *buf = malloc(rate * 4);
+ int r;
+
+ while((r = read(0, buf, rate * 4)) > 0){+ volume(buf, r);
+ write(1, buf, r);
+ }
+}
+
+void
+redraw(Image *screen)
+{+ int x = c.x * vol;
+
+ draw(screen, screen->r, display->white, nil, ZP);
+
+ draw(screen, Rect(screen->r.min.x + x - 1, screen->r.min.y,
+ screen->r.min.x + x + 1, screen->r.max.y),
+ display->black, nil, ZP);
+}
+
+void
+eresized(int new)
+{+ if(new && getwindow(display, Refnone) < 0)
+ fprint(2,"can't reattach to window");
+ c = divpt(subpt(screen->r.max, screen->r.min), 2);
+ redraw(screen);
+}
+
+void
+threadmain(int argc, char **argv)
+{+ Mouse m;
+ Point xy;
+ rate = RATE;
+ vol = 1.0;
+
+ if (argc > 1)
+ rate = atoi(argv[1]);
+
+ if(initdraw(0, 0, "volume") < 0)
+ sysfatal("initdraw: %r");+ einit(Emouse);
+
+ eresized(0);
+ proccreate(doproc, nil, mainstacksize);
+
+ for(;;m = emouse()){+ if(m.buttons & 1){+ xy = subpt(m.xy, screen->r.min);
+
+ vol = xy.x / (double)c.x;
+
+ redraw(screen);
+ }
+ }
+}