/*
 * MidiC.java
 * Copyright 2001 Michael Castleman, mlc67@columbia.edu
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version. 
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
import java.io.*;
/**
 * Converts a MIDI file output by CMidi back into C code.
 */
public class MidiC {
 protected InputStream in;
 protected OutputStream out;
 /** pulses per quarter note */
 protected int ppqn;
 /**
 * Constructs a new MidiC
 * @param in The source MIDI file
 * @param out Where the C code will be written to.
 */
 public MidiC(InputStream in, OutputStream out) {
 this.in = in;
 this.out = out;
 }
 
 /**
 * Actually does the conversion.
 * @exception IOException If a read or write error occurred.
 */
 public void doConversion() throws IOException {
 readHeader();
 ReadTrack mtrk;
 do {
 mtrk = new ReadTrack(in);
 } while (!mtrk.chunkType.equals("MTrk"));
 ReadTrack.Event evt;
 while ((evt = mtrk.readEvent()) != null) {
 if ((evt.status == (byte)(0x80)) || // note off, track 0
 ((evt.status == (byte)(0x90)) && (evt.data[1] == 0))) {
 if (evt.deltaTime>= (ppqn / 2)) // 8th note means NL
 out.write('\n');
 else if (evt.deltaTime>= (ppqn / 4)) // 16th note means NL
 out.write(' ');
 out.write(evt.data[0]);
 }
 }
 out.write('\n');
 }
 private void readHeader() throws IOException {
 ReadTrack head = new ReadTrack(in);
 if ((!head.chunkType.equals("MThd")) || (head.data.length != 6))
 throw new RuntimeException("input is not a MIDI file");
 if (head.data[1] != (byte)(0x01))
 throw new RuntimeException("I can only handle format-1 MIDI files");
 if (head.data[4] < 0)
 throw new RuntimeException("I don't yet know how to handle SMTPE-timecoded MIDI files");
 ppqn = (head.data[4] << 8) &#124; (head.data[5]);
 // there's a stupid track which we can ignore here.
 // also ignore any non-MTrk chunk (there shouldn't be any, but you never know)
 ReadTrack stupid;
 do {
 stupid = new ReadTrack(in);
 } while (!stupid.chunkType.equals("MTrk"));
 }
 /**
 * Main routine
 * @param args Command-line arguments. Should be the name of the input
 * MIDI file and the output C file.
 * @exception IOException if there's a problem reading or writing
 */
 public static void main(String[] args) throws IOException {
 if (args.length != 2) {
 System.out.println("Syntax:");
 System.out.println("\tjava -cp cmidi.jar MidiC infile.mid outfile.c");
 System.out.println("\t\"-\" means use stdin/out");
 System.exit(1);
 }
 InputStream ins = (args[0].equals("-") ? System.in : new FileInputStream(args[0]));
 OutputStream outs = (args[1].equals("-") ? (OutputStream)(System.out) : new FileOutputStream(args[1]));
 MidiC mc = new MidiC(ins, outs);
 mc.doConversion();
 ins.close();
 outs.close();
 }
}
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