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midizap/midizap.c

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/*
Contour ShuttlePro v2 interface
Copyright 2013 Eric Messick (FixedImagePhoto.com/Contact)
Copyright 2018 Albert Graef <aggraef@gmail.com>, various improvements
Based on a version (c) 2006 Trammell Hudson <hudson@osresearch.net>
which was in turn
Based heavily on code by Arendt David <admin@prnet.org>
*/
#include "midizap.h"
#include "jackdriver.h"
typedef struct input_event EV;
extern int debug_regex;
extern translation *default_translation;
unsigned short jogvalue = 0xffff;
int shuttlevalue = 0xffff;
struct timeval last_shuttle;
int need_synthetic_shuttle;
Display *display;
JACK_SEQ seq;
int enable_jack_output = 0, debug_jack = 0;
void
initdisplay(void)
{
int event, error, major, minor;
display = XOpenDisplay(0);
if (!display) {
fprintf(stderr, "unable to open X display\n");
exit(1);
}
if (!XTestQueryExtension(display, &event, &error, &major, &minor)) {
fprintf(stderr, "Xtest extensions not supported\n");
XCloseDisplay(display);
exit(1);
}
}
void
send_button(unsigned int button, int press)
{
XTestFakeButtonEvent(display, button, press ? True : False, DELAY);
}
void
send_key(KeySym key, int press)
{
KeyCode keycode;
if (key >= XK_Button_1 && key <= XK_Scroll_Down) {
send_button((unsigned int)key - XK_Button_0, press);
return;
}
keycode = XKeysymToKeycode(display, key);
XTestFakeKeyEvent(display, keycode, press ? True : False, DELAY);
}
// cached controller and pitch bend values
static int8_t ccvalue[16][128];
static int16_t pbvalue[16] =
{8192, 8192, 8192, 8192, 8192, 8192, 8192, 8192,
8192, 8192, 8192, 8192, 8192, 8192, 8192, 8192};
void
send_midi(int status, int data, int step, int incr, int index, int dir)
{
if (!enable_jack_output) return; // MIDI output not enabled
uint8_t msg[3];
int chan = status & 0x0f;
msg[0] = status;
msg[1] = data;
switch (status & 0xf0) {
case 0x90:
if (!index) {
msg[2] = 127;
} else {
msg[2] = 0;
}
break;
case 0xb0:
if (dir) {
if (incr) {
// incremental controller, simply spit out a relative sign bit value
msg[2] = dir>0?1:65;
} else {
// increment (dir==1) or decrement (dir==-1) the current value,
// clamping it to the 0..127 data byte range
if (dir > 0) {
if (ccvalue[chan][data] >= 127) return;
msg[2] = ++ccvalue[chan][data];
} else {
if (ccvalue[chan][data] == 0) return;
msg[2] = --ccvalue[chan][data];
}
}
} else if (!index) {
msg[2] = 127;
} else {
msg[2] = 0;
}
break;
case 0xe0: {
// pitch bends are treated similarly to a controller, but with a 14 bit
// range (0..16383, with 8192 being the center value)
int pbval = 0;
if (dir) {
if (!step) return;
dir *= step;
if (dir > 0) {
if (pbvalue[chan] >= 16383) return;
pbvalue[chan] += dir;
if (pbvalue[chan] > 16383) pbvalue[chan] = 16383;
} else {
if (pbvalue[chan] == 0) return;
pbvalue[chan] += dir;
if (pbvalue[chan] < 0) pbvalue[chan] = 0;
}
pbval = pbvalue[chan];
} else if (!index) {
pbval = 16383;
} else {
// we use 8192 (center) as the "home" (a.k.a. "off") value, so the pitch
// will only bend up, never down below the center value
pbval = 8192;
}
// the result is a 14 bit value which gets encoded as a combination of two
// 7 bit values which become the data bytes of the message
msg[1] = pbval & 0x7f; // LSB (lower 7 bits)
msg[2] = pbval >> 7; // MSB (upper 7 bits)
break;
}
case 0xc0:
// just send the message
break;
default:
return;
}
queue_midi(&seq, msg);
}
stroke *
fetch_stroke(translation *tr, int status, int chan, int data,
int index, int dir)
{
if (tr != NULL) {
switch (status) {
case 0x90:
return tr->note[chan][data][index];
case 0xc0:
return tr->pc[chan][data][index];
case 0xb0:
if (dir)
return tr->ccs[chan][data][dir>0];
else
return tr->cc[chan][data][index];
case 0xe0:
if (dir)
return tr->pbs[chan][dir>0];
else
return tr->pb[chan][index];
default:
return NULL;
}
} else
return NULL;
}
static char *note_names[] = { "C", "C#", "D", "Eb", "E", "F", "F#", "G", "G#", "A", "Bb", "B" };
void
send_strokes(translation *tr, int status, int chan, int data,
int index, int dir)
{
int nkeys = 0;
stroke *s = fetch_stroke(tr, status, chan, data, index, dir);
if (s == NULL) {
tr = default_translation;
s = fetch_stroke(tr, status, chan, data, index, dir);
}
if (debug_keys && s) {
char name[100] = "??", *suffix = "";
switch (status) {
case 0x90:
sprintf(name, "%s%d-%d", note_names[data % 12], data / 12, chan+1);
break;
case 0xb0:
if (!dir)
suffix = "";
else if (tr->is_incr[chan][data])
suffix = (dir<0)?"<":">";
else
suffix = (dir<0)?"-":"+";
sprintf(name, "CC%d-%d%s", data, chan+1, suffix);
break;
case 0xc0:
sprintf(name, "PC%d-%d", data, chan+1);
break;
case 0xe0:
if (!dir)
suffix = "";
else
suffix = (dir<0)?"-":"+";
sprintf(name, "PB-%d%s", chan+1, suffix);
break;
default: // this can't happen
break;
}
print_stroke_sequence(name, dir?"":index?"U":"D", s);
}
while (s) {
if (s->keysym) {
send_key(s->keysym, s->press);
nkeys++;
} else {
send_midi(s->status, s->data, s->step, s->incr, index, dir);
}
s = s->next;
}
// no need to flush the display if we didn't send any keys
if (nkeys) {
XFlush(display);
}
}
char *
get_window_name(Window win)
{
Atom prop = XInternAtom(display, "WM_NAME", False);
Atom type;
int form;
unsigned long remain, len;
unsigned char *list;
if (XGetWindowProperty(display, win, prop, 0, 1024, False,
AnyPropertyType, &type, &form, &len, &remain,
&list) != Success) {
fprintf(stderr, "XGetWindowProperty failed for window 0x%x\n", (int)win);
return NULL;
}
return (char*)list;
}
char *
get_window_class(Window win)
{
Atom prop = XInternAtom(display, "WM_CLASS", False);
Atom type;
int form;
unsigned long remain, len;
unsigned char *list;
if (XGetWindowProperty(display, win, prop, 0, 1024, False,
AnyPropertyType, &type, &form, &len, &remain,
&list) != Success) {
fprintf(stderr, "XGetWindowProperty failed for window 0x%x\n", (int)win);
return NULL;
}
return (char*)list;
}
char *
walk_window_tree(Window win, char **window_class)
{
char *window_name;
Window root = 0;
Window parent;
Window *children;
unsigned int nchildren;
while (win != root) {
window_name = get_window_name(win);
if (window_name != NULL) {
*window_class = get_window_class(win);
return window_name;
}
if (XQueryTree(display, win, &root, &parent, &children, &nchildren)) {
win = parent;
XFree(children);
} else {
fprintf(stderr, "XQueryTree failed for window 0x%x\n", (int)win);
return NULL;
}
}
return NULL;
}
static Window last_focused_window = 0;
static translation *last_window_translation = NULL;
translation *
get_focused_window_translation()
{
Window focus;
int revert_to;
char *window_name = NULL, *window_class = NULL;
char *name;
XGetInputFocus(display, &focus, &revert_to);
if (focus != last_focused_window) {
last_focused_window = focus;
window_name = walk_window_tree(focus, &window_class);
if (window_name == NULL) {
name = "-- Unlabeled Window --";
} else {
name = window_name;
}
last_window_translation = get_translation(name, window_class);
if (debug_regex) {
if (last_window_translation != NULL) {
printf("translation: %s for %s (class %s)\n",
last_window_translation->name, name, window_class);
} else {
printf("no translation found for %s (class %s)\n", name, window_class);
}
}
if (window_name != NULL) {
XFree(window_name);
}
if (window_class != NULL) {
XFree(window_class);
}
}
return last_window_translation;
}
static int8_t inccvalue[16][128];
static int16_t inpbvalue[16] =
{8192, 8192, 8192, 8192, 8192, 8192, 8192, 8192,
8192, 8192, 8192, 8192, 8192, 8192, 8192, 8192};
static uint8_t notedown[16][128];
static uint8_t inccdown[16][128];
static uint8_t inpbdown[16];
int
check_incr(translation *tr, int chan, int data)
{
if (tr->ccs[chan][data][0] || tr->ccs[chan][data][1])
return tr->is_incr[chan][data];
tr = default_translation;
if (tr->ccs[chan][data][0] || tr->ccs[chan][data][1])
return tr->is_incr[chan][data];
return 0;
}
int
check_pbs(translation *tr, int chan)
{
if (tr->pbs[chan][0] || tr->pbs[chan][1])
return 1;
tr = default_translation;
if (tr->pbs[chan][0] || tr->pbs[chan][1])
return 1;
return 0;
}
void
handle_event(uint8_t *msg)
{
translation *tr = get_focused_window_translation();
//fprintf(stderr, "midi: %0x %0x %0x\n", msg[0], msg[1], msg[2]);
if (tr != NULL) {
int status = msg[0] & 0xf0, chan = msg[0] & 0x0f;
if (status == 0x80) {
status = 0x90;
msg[0] = status | chan;
msg[2] = 0;
}
switch (status) {
case 0xc0:
send_strokes(tr, status, chan, msg[1], 0, 0);
send_strokes(tr, status, chan, msg[1], 1, 0);
break;
case 0x90:
if (msg[2]) {
if (!notedown[chan][msg[1]]) {
send_strokes(tr, status, chan, msg[1], 0, 0);
notedown[chan][msg[1]] = 1;
}
} else {
if (notedown[chan][msg[1]]) {
send_strokes(tr, status, chan, msg[1], 1, 0);
notedown[chan][msg[1]] = 0;
}
}
break;
case 0xb0:
if (msg[2]) {
if (!inccdown[chan][msg[1]]) {
send_strokes(tr, status, chan, msg[1], 0, 0);
inccdown[chan][msg[1]] = 1;
}
} else {
if (inccdown[chan][msg[1]]) {
send_strokes(tr, status, chan, msg[1], 1, 0);
inccdown[chan][msg[1]] = 0;
}
}
if (check_incr(tr, chan, msg[1])) {
// Incremental controller a la MCU. NB: This assumes a signed bit
// representation (values above 0x40 indicate counter-clockwise
// rotation), which seems to be what most DAWs expect nowadays.
// But some DAWs may also have it the other way round, so that you may
// have to swap the actions for increment and decrement. XXXTODO:
// Maybe the encoding should be a configurable parameter?
if (msg[2] < 64) {
int d = msg[2];
while (d) {
send_strokes(tr, status, chan, msg[1], 0, 1);
d--;
}
} else if (msg[2] > 64) {
int d = msg[2]-64;
while (d) {
send_strokes(tr, status, chan, msg[1], 0, -1);
d--;
}
}
} else if (inccvalue[chan][msg[1]] != msg[2]) {
int dir = inccvalue[chan][msg[1]] > msg[2] ? -1 : 1;
while (inccvalue[chan][msg[1]] != msg[2]) {
send_strokes(tr, status, chan, msg[1], 0, dir);
inccvalue[chan][msg[1]] += dir;
}
}
break;
case 0xe0: {
int bend = ((msg[2] << 7) | msg[1]) - 8192;
//fprintf(stderr, "pb %d\n", bend);
if (bend) {
if (!inpbdown[chan]) {
send_strokes(tr, status, chan, 0, 0, 0);
inpbdown[chan] = 1;
}
} else {
if (inpbdown[chan]) {
send_strokes(tr, status, chan, 0, 1, 0);
inpbdown[chan] = 0;
}
}
if (check_pbs(tr, chan) && inpbvalue[chan] - 8192 != bend) {
int dir = inpbvalue[chan] - 8192 > bend ? -1 : 1;
int step = tr->step[chan][dir>0];
if (step) {
while (inpbvalue[chan] - 8192 != bend) {
int d = abs(inpbvalue[chan] - 8192 - bend);
if (d > step) d = step;
if (d < step) break;
send_strokes(tr, status, chan, 0, 0, dir);
inpbvalue[chan] += dir*d;
}
}
}
break;
}
default:
// ignore everything else
break;
}
}
}
void help(char *progname)
{
fprintf(stderr, "Usage: %s [-h] [-o] [-r rcfile] [-d[rskj]]\n", progname);
fprintf(stderr, "-h print this message\n");
fprintf(stderr, "-o enable MIDI output\n");
fprintf(stderr, "-r config file name (default: MIDIZAP_CONFIG_FILE variable or ~/.midizaprc)\n");
fprintf(stderr, "-d debug (r = regex, s = strokes, k = keys, j = jack; default: all)\n");
}
uint8_t quit = 0;
void quitter()
{
quit = 1;
}
// poll interval in microsec (this shouldn't be too large to avoid jitter)
#define POLL_INTERVAL 1000
// how often we check the config file per sec (> 0, < 1000000/POLL_INTERVAL)
#define CONF_FREQ 1
#define MAX_COUNT (1000000/CONF_FREQ/POLL_INTERVAL)
int
main(int argc, char **argv)
{
uint8_t msg[3];
int opt, count = 0;
while ((opt = getopt(argc, argv, "hod::r:")) != -1) {
switch (opt) {
case 'h':
help(argv[0]);
exit(0);
case 'o':
enable_jack_output = 1;
break;
case 'd':
if (optarg && *optarg) {
const char *a = optarg;
while (*a) {
switch (*a) {
case 'r':
default_debug_regex = 1;
break;
case 's':
default_debug_strokes = 1;
break;
case 'k':
default_debug_keys = 1;
break;
case 'j':
debug_jack = 1;
break;
default:
fprintf(stderr, "%s: unknown debugging option (-d), must be r, s, k or j\n", argv[0]);
fprintf(stderr, "Try -h for help.\n");
exit(1);
}
++a;
}
} else {
default_debug_regex = default_debug_strokes = default_debug_keys = 1;
debug_jack = 1;
}
break;
case 'r':
config_file_name = optarg;
break;
default:
fprintf(stderr, "Try -h for help.\n");
exit(1);
}
}
if (optind < argc) {
help(argv[0]);
exit(1);
}
initdisplay();
seq.usein = 1; seq.useout = enable_jack_output;
if (!init_jack(&seq, debug_jack)) {
exit(1);
}
signal(SIGINT, quitter);
// force the config file to be loaded initially
count = MAX_COUNT;
while (!quit) {
while (pop_midi(&seq, msg)) {
handle_event(msg);
count = 0;
}
usleep(POLL_INTERVAL);
if (++count >= MAX_COUNT) {
// Check whether to reload the config file if we haven't seen any MIDI
// input in a while. Note that if the file *is* reloaded, then we also
// need to reset last_focused_window here, so that the translations of
// the focused window are recomputed the next time we handle an event.
if (read_config_file()) last_focused_window = 0;
count = 0;
}
}
printf(" [exiting]\n");
close_jack(&seq);
}
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