初始化内容

third/midifile/tools/midi2beep.cpp

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+//
+// Programmer:    Tom M. <tom.mbrt@gmail.com>
+// Creation Date: Sat Nov 05 14:51:00 PST 2016
+// Last Modified: Sat Nov 05 14:51:00 PST 2016
+// Filename:      tools/mid2beep.cpp
+// URL:           https://github.com/craigsapp/midifile/blob/master/tools/midi2beep.cpp
+// Syntax:        C++11
+// vim:           ts=3
+//
+// Description:   Linux-only: Play a monophonic midi file on the PC Speaker (i.e. the
+//                midifile contains only a single track on a single channel playing
+//                a single note at a time).
+//
+
+#include "MidiFile.h"
+#include "Options.h"
+
+#include <cmath>
+#include <iostream>
+#include <signal.h>
+#include <unistd.h> // usleep()
+
+#ifdef __APPLE__
+	#include <sys/uio.h>
+#else
+	#include <sys/io.h>
+#endif
+
+using namespace std;
+using namespace smf;
+
+
+void beepOff   (int);
+void beep      (int fre, int usDuration);
+
+
+///////////////////////////////////////////////////////////////////////////
+
+int main(int argc, char** argv) {
+	signal(SIGINT, beepOff);
+
+	Options options;
+	options.process(argc, argv);
+	MidiFile midifile;
+	if (options.getArgCount() == 1) {
+		midifile.read(options.getArg(1));
+	}
+	else {
+		cout << "usage: " << argv[0] << " file.mid" << endl;
+		return -1;
+	}
+
+	int k= iopl(3);
+
+	printf("\n Result iopl: %d \n", k);
+	if (k<0) {
+		cerr << " iopl() " << endl;
+		return k;
+	}
+
+	midifile.linkNotePairs();
+	midifile.joinTracks();
+	midifile.doTimeAnalysis();
+
+	midifile.absoluteTicks();
+
+	double lastNoteFinished = 0.0;
+	for (int track=0; track < midifile.getTrackCount(); track++) {
+		for (int i=0; i<midifile[track].size(); i++) {
+			MidiEvent* mev = &midifile[track][i];
+			if (!mev->isNoteOn() || mev->getLinkedEvent() == NULL) {
+				continue;
+			}
+
+			// pause, silence
+			int silence = static_cast<int>((midifile.getTimeInSeconds(mev->tick) - lastNoteFinished) * 1000 * 1000);
+			if(silence >0) {
+				usleep(silence);
+			}
+
+			double duration = mev->getDurationInSeconds();
+
+			int halfTonesFromA4 = mev->getKeyNumber() - 69; // 69 == A4 == 440Hz
+			int frq = 440 * pow(2, halfTonesFromA4/12.0);
+
+			// play note
+			beep(frq, static_cast<int>(duration*1000*1000));
+
+			MidiEvent* off = mev->getLinkedEvent();
+			lastNoteFinished = midifile.getTimeInSeconds(off->tick);
+
+		}
+	}
+
+	return 0;
+}
+
+
+///////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////
+//
+// beepOff --
+
+void beepOff(int) {
+	int r = inb(0x61);
+	outb(r|3, 0x61);
+	outb(r & 0xFC, 0x61);
+
+	exit(0);
+}
+
+
+
+//////////////////////////////
+//
+// beep --
+//
+
+void beep(int fre, int usDuration) {
+	if (fre > 0) {
+		int ff = 1193180/fre;
+		outb( 0xB6,            0x43);
+		outb( ff & 0xff,       0x42);
+		outb((ff >> 8) & 0xff, 0x42);
+	}
+
+	int r = inb(0x61);
+	if(fre > 0) outb(r|3, 0x61);
+	usleep(usDuration);
+	outb(r & 0xFC, 0x61);
+}
+
+
+