初始化内容

third/midifile/tools/midi2text.cpp

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+//
+// Programmer:    Craig Stuart Sapp <craig@ccrma.stanford.edu>
+// Creation Date: Tue Jan 22 22:09:46 PST 2002
+// Last Modified: Mon Feb  9 21:26:32 PST 2015 Updated for C++11.
+// Filename:      tools/midi2text.cpp
+// URL:           https://github.com/craigsapp/midifile/blob/master/tools/midi2text.cpp
+// Syntax:        C++11
+// vim:           ts=3
+//
+// Description:   Converts a MIDI file into a text based notelist.
+//
+
+#include "MidiFile.h"
+#include "Options.h"
+
+#include <cctype>
+#include <cstdio>
+#include <cstring>
+#include <iostream>
+#include <vector>
+
+using namespace std;
+using namespace smf;
+
+
+void  convertMidiFileToText (MidiFile& midifile);
+void  setTempo              (MidiFile& midifile, int index, double& tempo);
+void  checkOptions          (Options& opts, int argc, char** argv);
+void  example               (void);
+void  usage                 (const char* command);
+
+// User interface variables:
+Options options;
+int     debugQ = 0;             // use with --debug option
+int     maxcount = 100000;
+double  tempo = 60.0;
+
+
+//////////////////////////////////////////////////////////////////////////
+
+int main(int argc, char* argv[]) {
+	checkOptions(options, argc, argv);
+	MidiFile midifile(options.getArg(1));
+	convertMidiFileToText(midifile);
+	return 0;
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+
+//////////////////////////////
+//
+// convertMidiFileToText --
+//
+
+void convertMidiFileToText(MidiFile& midifile) {
+	midifile.absoluteTicks();
+	midifile.joinTracks();
+
+	vector<double> ontimes(128);
+	vector<int> onvelocities(128);
+	int i;
+	for (i=0; i<128; i++) {
+		ontimes[i] = -1.0;
+		onvelocities[i] = -1;
+	}
+
+	double offtime = 0.0;
+
+	int key = 0;
+	int vel = 0;
+
+	for (i=0; i<midifile.getNumEvents(0); i++) {
+		int command = midifile[0][i][0] & 0xf0;
+		if (command == 0x90 && midifile[0][i][2] != 0) {
+			// store note-on velocity and time
+			key = midifile[0][i][1];
+			vel = midifile[0][i][2];
+			ontimes[key] = midifile[0][i].tick * 60.0 / tempo / midifile.getTicksPerQuarterNote();
+			onvelocities[key] = vel;
+		} else if (command == 0x90 || command == 0x80) {
+			// note off command write to output
+			key = midifile[0][i][1];
+			offtime = midifile[0][i].tick * 60.0 / midifile.getTicksPerQuarterNote() / tempo;
+			cout << "note\t" << ontimes[key]
+			     << "\t" << offtime - ontimes[key]
+			     << "\t" << key << "\t" << onvelocities[key] << endl;
+			onvelocities[key] = -1;
+			ontimes[key] = -1.0;
+		}
+
+		// check for tempo indication
+		if (midifile[0][i][0] == 0xff && midifile[0][i][1] == 0x51) {
+			setTempo(midifile, i, tempo);
+		}
+	}
+
+}
+
+
+//////////////////////////////
+//
+// setTempo -- set the current tempo
+//
+
+void setTempo(MidiFile& midifile, int index, double& tempo) {
+	static int count = 0;
+	count++;
+
+	MidiEvent& mididata = midifile[0][index];
+
+	int microseconds = 0;
+	microseconds = microseconds | (mididata[3] << 16);
+	microseconds = microseconds | (mididata[4] << 8);
+	microseconds = microseconds | (mididata[5] << 0);
+
+	double newtempo = 60.0 / microseconds * 1000000.0;
+	if (count <= 1) {
+		tempo = newtempo;
+	} else if (tempo != newtempo) {
+		cout << "; WARNING: change of tempo from " << tempo
+			  << " to " << newtempo << " ignored" << endl;
+	}
+}
+
+
+
+//////////////////////////////
+//
+// checkOptions --
+//
+
+void checkOptions(Options& opts, int argc, char* argv[]) {
+	opts.define("author=b",  "author of program");
+	opts.define("version=b", "compilation info");
+	opts.define("example=b", "example usages");
+	opts.define("h|help=b",  "short description");
+
+	opts.define("debug=b",  "debug mode to find errors in input file");
+	opts.define("max=i:100000", "maximum number of notes expected in input");
+
+	opts.process(argc, argv);
+
+	// handle basic options:
+	if (opts.getBoolean("author")) {
+		cout << "Written by Craig Stuart Sapp, "
+			  << "craig@ccrma.stanford.edu, 22 Jan 2002" << endl;
+		exit(0);
+	} else if (opts.getBoolean("version")) {
+		cout << argv[0] << ", version: 22 Jan 2002" << endl;
+		cout << "compiled: " << __DATE__ << endl;
+		exit(0);
+	} else if (opts.getBoolean("help")) {
+		usage(opts.getCommand().c_str());
+		exit(0);
+	} else if (opts.getBoolean("example")) {
+		example();
+		exit(0);
+	}
+
+	debugQ = opts.getBoolean("debug");
+	maxcount = opts.getInteger("max");
+
+	if (opts.getArgCount() != 1) {
+		usage(opts.getCommand().c_str());
+		exit(1);
+	}
+
+}
+
+
+
+//////////////////////////////
+//
+// example --
+//
+
+void example(void) {
+	// add examples here
+}
+
+
+
+//////////////////////////////
+//
+// usage --
+//
+
+void usage(const char* command) {
+	cout << "Usage: " << command << " midifile" << endl;
+}
+
+
+