shithub: ft²

Download patch

ref: 43313efb3f2b47fc074e64ea2dcd43615d6420fd
parent: f89768c682dd753db8e5e88848c90dd143b2fea6
author: qwx <qwx@sciops.net>
date: Sun Mar 5 17:58:36 EST 2023 

add usb midi support

pending adding a better version to portmidi/npe (todo)


--- /dev/null
+++ b/midi.c
@@ -1,0 +1,170 @@
+#include <stdio.h>
+#include <thread.h>
+#include "ft2_header.h"
+#include "ft2_edit.h"
+#include "ft2_config.h"
+#include "ft2_gui.h"
+#include "ft2_midi.h"
+#include "ft2_audio.h"
+#include "ft2_mouse.h"
+#include "ft2_pattern_ed.h"
+#include "ft2_structs.h"
+#include "rtmidi/rtmidi_c.h"
+
+static struct RtMidiWrapper notrt;
+static RtMidiCCallback callback;
+static int mpid = -1;
+static char *epfile, *eptab[MAX_MIDI_DEVICES];
+static int disable[MAX_MIDI_DEVICES];
+static int neps;
+
+static int
+scaneps(void)
+{
+	int fd, i, n, m;
+	char *s, **t, **e, buf[512], *fl[32];
+	Dir *d;
+
+	e = eptab + nelem(eptab);
+	for(t=eptab; t<e; t++){
+		free(*t);
+		*t = nil;
+	}
+	neps = 0;
+	t = eptab;
+	/* special case for plugging in any non endpoint file */
+	if((s = getenv("midikbd")) != nil){
+		*t++ = s;
+		neps++;
+	}
+	if((fd = open("/dev/usb", OREAD)) < 0){
+		fprint(2, "scaneps: %r\n");
+		return neps;
+	}
+	n = dirreadall(fd, &d);
+	close(fd);
+	if(n < 0){
+		fprint(2, "scaneps: %r\n");
+		return neps;
+	}
+	for(i=0; i<n; i++){
+		snprint(buf, sizeof buf, "/dev/usb/%s/ctl", d[i].name);
+		if(epfile != nil && (s = strrchr(epfile, '/')) != nil){
+			if(strncmp(buf, epfile, s - epfile) == 0)
+				goto gotit;
+		}
+		if((fd = open(buf, OREAD)) < 0)
+			continue;
+		if((m = pread(fd, buf, sizeof buf, 0)) <= 0)
+			continue;
+		close(fd);
+		buf[m-1] = 0;
+		if(getfields(buf, fl, nelem(fl), 0, " ") < 26)
+			continue;
+		if(strcmp(fl[0], "enabled") != 0
+		|| strcmp(fl[2], "r") != 0 && strcmp(fl[2], "rw") != 0
+		|| strcmp(fl[25], "idle") != 0)
+			continue;
+	gotit:
+		if((*t++ = smprint("/dev/usb/%s/data", d[i].name)) == nil)
+			sysfatal("smprint: %r\n");
+		neps++;
+		if(t >= e)
+			break;
+	}
+	free(d);
+	return neps;
+}
+
+unsigned int
+rtmidi_get_port_count(RtMidiPtr)
+{
+	notrt.ok = true;
+	return scaneps();
+}
+
+char *
+rtmidi_get_port_name(RtMidiPtr, unsigned int i)
+{
+	char *s;
+
+	if(i >= neps)
+		return NULL;
+	if((s = strdup(eptab[i])) == nil)
+		sysfatal("strdup: %r");
+	return s;
+}
+
+void
+rtmidi_in_cancel_callback(RtMidiInPtr)
+{
+}
+
+void rtmidi_close_port(RtMidiPtr)
+{
+	threadkill(mpid);
+	mpid = -1;
+	callback = nil;
+	notrt.ok = false;
+	epfile = nil;
+}
+
+void rtmidi_in_free(RtMidiInPtr)
+{
+}
+
+RtMidiInPtr
+rtmidi_in_create_default(void)
+{
+	notrt.ok = true;
+	return &notrt;
+}
+
+void
+midiproc(void *)
+{
+	int fd, n, k;
+	uchar buf[1024];
+
+	if((fd = open(epfile, OREAD)) < 0){
+		fprint(2, "midiproc: could not open stream: %r; exiting");
+		goto end;
+	}
+	while((n = read(fd, buf, sizeof buf)) > 0){
+		if(n & 3)
+			fprint(2, "midiproc: malformed message size %d\n", n);
+		for(k=0; k<n; k+=4)
+			if(callback != nil)
+				callback(.0, buf+k+1, 3, nil);
+			else
+				fprint(2, "midiproc: discarding message\n");
+	}
+	fprint(2, "midiproc is off this merry-go-round: %r\n");
+end:
+	epfile = nil;
+	notrt.ok = false;
+	mpid = -1;
+}
+
+void
+rtmidi_open_port(RtMidiPtr, unsigned int i, char *)
+{
+	assert(mpid < 0);
+	if(i >= neps)
+		return;
+	notrt.ok = true;
+	epfile = eptab[i];
+	if((mpid = proccreate(midiproc, nil, mainstacksize)) < 0)
+		sysfatal("proccreate: %r");
+}
+
+void
+rtmidi_in_set_callback(RtMidiInPtr, RtMidiCCallback fn, void *)
+{
+	callback = fn;
+}
+
+void
+rtmidi_in_ignore_types(RtMidiInPtr, bool, bool, bool)
+{
+}
--- a/mkfile.plan9
+++ b/mkfile.plan9
@@ -2,7 +2,7 @@
 
 BIN=/$objtype/bin/audio
 TARG=ft2
-CFLAGS=$CFLAGS -p -Isrc -I/sys/include/npe -D__plan9__
+CFLAGS=$CFLAGS -p -Isrc -Isrc/rtmidi -I/sys/include/npe -D__plan9__ -DHAS_MIDI
 
 HFILES=\
 	src/ft2_about.h\
@@ -124,6 +124,7 @@
 	src/smploaders/ft2_load_iff.$O\
 	src/smploaders/ft2_load_raw.$O\
 	src/smploaders/ft2_load_wav.$O\
+	midi.$O\
 
 default:V: all
 
--- a/src/ft2_midi.c
+++ b/src/ft2_midi.c
@@ -194,8 +194,11 @@
 	if (midiDev == NULL)
 		return false;
 
-	if (getNumMidiInDevices() == 0)
+	const uint32_t numDevices = getNumMidiInDevices();
+	if (numDevices == 0 || numDevices != midi.numInputDevices){
+		midi.rescanDevicesFlag = true;
 		return false;
+	}
 
 	rtmidi_open_port(midiDev, deviceID, "FT2 Clone MIDI Port");
 	if (!midiDev->ok)
@@ -285,7 +288,10 @@
 	uint32_t i;
 
 	if (midi.inputDeviceName != NULL)
+	{
 		free(midi.inputDeviceName);
+		midi.inputDeviceName = NULL;
+	}
 
 	const uint32_t numDevices = getNumMidiInDevices();
 	if (numDevices == 0)
@@ -477,7 +483,12 @@
 	closeMidiInDevice();
 	freeMidiIn();
 	initMidiIn();
-	openMidiInDevice(midi.inputDevice);
+	if(!openMidiInDevice(midi.inputDevice)){
+		free(midi.inputDeviceName);
+		midi.inputDeviceName = NULL;
+		midi.inputDevice = -1;
+		return false;
+	}
 
 	drawMidiInputList();
 	return true;