add midi2beep program

src-programs/midi2beep.cpp

@@ -0,0 +1,117 @@
+//
+// 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:      midifile/src-programs/mid2beep.cpp
+// Web Address:   https://github.com/craigsapp/midifile/blob/master/src-programs/mid2beep.cpp
+// Syntax:        C++
+//
+// Description:   Linux-only: Play a monophonic midi file on the PC Speaker (i.e. the midi file contains only a single track
+//                on a single channel playing a single note at a time)
+//
+
+
+#include <iostream>
+#include <cmath>
+#include <unistd.h>     // usleep()
+#include <sys/io.h>
+
+#include "MidiFile.h"
+#include "Options.h"
+
+#include <signal.h>
+
+using namespace std;
+
+void beepOff(int)
+{
+
+    int r = inb(0x61);
+    outb(r|3, 0x61);
+    outb(r & 0xFC, 0x61);
+
+    exit(0);
+}
+
+void beep(int fre, int usDuration)
+{
+    int r, ff;
+
+    if(fre > 0) {
+        ff = 1193180/fre;
+        outb( 0xB6,            0x43);
+        outb( ff & 0xff,       0x42);
+        outb((ff >> 8) & 0xff, 0x42);
+    }
+
+    r = inb(0x61);
+    if(fre > 0) outb(r|3, 0x61);
+    usleep(usDuration);
+    outb(r & 0xFC, 0x61);
+}
+
+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;
+}
+
+