初始化内容

third/midifile/tools/smfdur.cpp

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+//
+// Programmer:    Craig Stuart Sapp <craig@ccrma.stanford.edu>
+// Creation Date: Tue Feb 23 05:34:17 PST 2016
+// Last Modified: Tue Feb 23 05:34:20 PST 2016
+// Filename:      tools/smfdur.cpp
+// URL:           https://github.com/craigsapp/midifile/blob/master/tools/smfdur.cpp
+// Syntax:        C++11
+// vim:           ts=3
+//
+// Description:   Calcualte the total duration of a MIDI file.
+//
+
+#include "MidiFile.h"
+#include "Options.h"
+
+#include <iostream>
+
+using namespace std;
+using namespace smf;
+
+
+void      checkOptions          (Options& opts, int argc, char* argv[]);
+void      usage                 (const char* command);
+void      example               (void);
+double    getTotalDuration      (MidiFile& midifile);
+string    minutes               (double seconds);
+
+// User interface variables:
+Options options;
+
+
+//////////////////////////////////////////////////////////////////////////
+
+int main(int argc, char* argv[]) {
+	checkOptions(options, argc, argv);
+	int fileQ  = options.getBoolean("filename");
+	int minuteQ = options.getBoolean("minute");
+
+	MidiFile midifile;
+
+	int counter = 0;
+	double sum = 0.0;
+	int numinputs = options.getArgCount();
+	for (int i=0; i < numinputs || i==0; i++) {
+		midifile.clear();
+		if (options.getArgCount() < 1) {
+			midifile.read(cin);
+		} else {
+			midifile.read(options.getArg(i+1));
+		}
+		if (options.getArgCount() > 1) {
+			cout << options.getArg(i+1) << "\t";
+		}
+		double duration = getTotalDuration(midifile);
+		sum += duration;
+		counter++;
+		cout << duration;
+		if (minuteQ) {
+			cout << "\t" << minutes(duration);
+		}
+		if (fileQ) {
+			cout << "\t";
+			cout << midifile.getFilename();
+		}
+		cout << endl;
+	}
+	if (counter > 1) {
+		cout << "TOTAL\t" << sum;
+		if (minuteQ) {
+			cout << "\t" << minutes(sum);
+		}
+		cout << endl;
+		cout << "AVERAGE\t" << sum/counter;
+		if (minuteQ) {
+			cout << "\t" << minutes(sum/counter);
+		}
+		cout << endl;
+	}
+}
+
+
+//////////////////////////////////////////////////////////////////////////
+
+
+
+//////////////////////////////
+//
+// minutes -- display time in seconds as minutes mm:ss, or hh:mm:ss if 
+//    an hour or longer
+//
+
+string minutes(double seconds) {
+	int minutes = (int)(seconds / 60);
+	seconds = seconds - minutes * 60.0;
+	if (seconds - int(seconds) >= 0.5) {
+		seconds = int(seconds) + 1;
+	} else{
+		seconds = int(seconds);
+	}
+	if (seconds == 60) {
+		minutes++;
+		seconds = 0;
+	}
+	int hours = minutes / 60;
+	if (hours >= 1) {
+		minutes = minutes - hours * 60;
+	}
+
+	string output;
+	if (hours) {
+		output += to_string(hours);
+		output += ":";
+		if (minutes < 10) {
+			output += "0";
+		}
+	}
+	output += to_string(minutes);
+	output += ":";
+	if (seconds < 10) {
+		output += "0";
+	}
+	int isec = (int)seconds;
+	output += to_string(isec);
+	return output;
+}
+
+
+
+
+//////////////////////////////
+//
+// getTotalDuration --
+//
+
+double getTotalDuration(MidiFile& midifile) {
+	midifile.doTimeAnalysis();
+	midifile.joinTracks();
+	return midifile[0].last().seconds;
+}
+
+
+
+//////////////////////////////
+//
+// checkOptions --
+//
+
+void checkOptions(Options& opts, int argc, char* argv[]) {
+	opts.define("f|filename=b", "display filename after duration");
+	opts.define("m|minute|minutes=b", "also display duration in minutes after seconds display");
+
+	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.process(argc, argv);
+
+	// handle basic options:
+	if (opts.getBoolean("author")) {
+		cout << "Written by Craig Stuart Sapp, "
+			  << "craig@ccrma.stanford.edu, 23 February 2016" << endl;
+		exit(0);
+	} else if (opts.getBoolean("version")) {
+		cout << argv[0] << ", version: 23 February 2016" << 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);
+	}
+
+}
+
+
+
+//////////////////////////////
+//
+// example --
+//
+
+void example(void) {
+	// give example here
+}
+
+
+
+//////////////////////////////
+//
+// usage --
+//
+
+void usage(const char* command) {
+	cout << "Usage: " << command << " input(s)" << endl;
+}
+
+
+