初始化内容

third/midifile/tools/extractlyrics.cpp

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+//
+// Programmer:    Craig Stuart Sapp <craig@ccrma.stanford.edu>
+// Creation Date: Sun Apr 15 19:09:11 PDT 2018
+// Last Modified: Sun Apr 15 19:09:22 PDT 2018
+// Filename:      tools/extractlyrics.cpp
+// URL:           https://github.com/craigsapp/midifile/blob/master/tools/extractlyrics.cpp
+// Syntax:        C++11
+// vim:           ts=3
+//
+// Description:   Demonstration of how to extract lyrics from a MIDI file.
+//                Used the -s option to display the timestamp in seconds
+//                that the lyric occurs at.
+//
+
+#include "MidiFile.h"
+#include "Options.h"
+
+#include <iostream>
+
+using namespace std;
+using namespace smf;
+
+
+void extractLyrics(MidiFile& midifile, int seconds);
+
+
+///////////////////////////////////////////////////////////////////////////
+
+int main(int argc, char** argv) {
+	Options options;
+	options.define("s|seconds|timestamp=b", "display timestamp for lyrics");
+	options.process(argc, argv);
+
+	MidiFile midifile;
+	if (options.getArgCount() == 0) {
+		midifile.read(cin);
+	} else if (options.getArgCount() == 1) {
+		midifile.read(options.getArg(1));
+	} else {
+		cerr << "Too many filenames" << endl;
+		exit(1);
+	}
+
+	extractLyrics(midifile, options.getBoolean("seconds"));
+	return 0;
+}
+
+
+//////////////////////////////
+//
+// extractLyrics -- Extract lyrics from MIDI file, one lyric per output line.
+//
+
+void extractLyrics(MidiFile& midifile, int seconds) {
+	if (seconds) {
+		midifile.doTimeAnalysis();
+	}
+	for (int i=0; i<midifile.size(); i++) {
+		for (int j=0; j<midifile[i].size(); j++) {
+			if (!midifile[i][j].isLyricText()) {
+				continue;
+			}
+			string lyric = midifile[i][j].getMetaContent();
+			if (seconds) {
+				cout << midifile[i][j].seconds << "\t";
+			}
+			cout << lyric << endl;
+		}
+	}
+}
+
+
+/* Test data: 
+
+"MThd"
+4'6
+2'0
+2'1
+2'100
+
+"MTrk"
+4'126
+v0 FF 51 03 t85  ; tempo: 85 quarter note per minute
+
+v0 FF 05 05 "Some-"
+v0   90 '65 '100
+v200 90 '65 '0
+
+v0 FF 05 06 "-where"
+v0   90 '77 '100
+v200 90 '77 '0
+
+v0 FF 05 02 "o-"
+v0   90 '76 '100
+v100 90 '76 '0
+
+v0 FF 05 04 "-ver"
+v0   90 '72 '100
+v50  90 '72 '0
+
+v0 FF 05 03 "the"
+v0   90 '74 '100
+v50  90 '74 '0
+
+v0 FF 05 05 "rain-"
+v0   90 '76 '100
+v100 90 '76 '0
+
+v0 FF 05 04 "-bow"
+v0   90 '77 '100
+v100 90 '77 '0
+
+v0   FF 2F 00
+
+
+Example output using -s to show time in seconds for lyrics:
+
+$ bin/extractlyrics lyric.txt  -s
+0	Some-
+1.41176	-where
+2.82353	o-
+3.52941	-ver
+3.88235	the
+4.23529	rain-
+
+*/
+
+
+