This patch adds a MIDI file writer provider. This provider doesn't do
running status byte compression yet, but the basics work. I'm checking
it in.
2006-07-02 Anthony Green <[EMAIL PROTECTED]>
* resource/META-INF/services/javax.sound.midi.spi.MidiFileWriter,
gnu/javax/sound/midi/file/MidiFileWriter.java,
gnu/javax/sound/midi/file/MidiDataOutputStream.java: New files.
Index: resource/META-INF/services/javax.sound.midi.spi.MidiFileWriter
===================================================================
RCS file: resource/META-INF/services/javax.sound.midi.spi.MidiFileWriter
diff -N resource/META-INF/services/javax.sound.midi.spi.MidiFileWriter
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ resource/META-INF/services/javax.sound.midi.spi.MidiFileWriter 2 Jul
2006 18:10:13 -0000
@@ -0,0 +1 @@
+gnu.javax.sound.midi.file.MidiFileWriter
Index: gnu/javax/sound/midi/file/MidiDataOutputStream.java
===================================================================
RCS file: gnu/javax/sound/midi/file/MidiDataOutputStream.java
diff -N gnu/javax/sound/midi/file/MidiDataOutputStream.java
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ gnu/javax/sound/midi/file/MidiDataOutputStream.java 2 Jul 2006 18:10:13
-0000
@@ -0,0 +1,114 @@
+/* MidiDataOutputStream.java -- adds variable length MIDI ints
+ Copyright (C) 2006 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath 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, or (at your option)
+any later version.
+
+GNU Classpath 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 GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.javax.sound.midi.file;
+
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+
+/**
+ * MidiDataOutputStream is simply a DataOutputStream with the addition
+ * of special variable length int writing as defined by the MIDI spec.
+ *
+ * @author Anthony Green ([EMAIL PROTECTED])
+ */
+public class MidiDataOutputStream
+ extends DataOutputStream
+{
+ /**
+ * Create a MidiDataOutputStream.
+ */
+ public MidiDataOutputStream(OutputStream os)
+ {
+ super(os);
+ }
+
+ /**
+ * Return the length of a variable length encoded int without
+ * writing it out.
+ *
+ * @return the length of the encoding
+ */
+ public int variableLengthIntLength (int value)
+ {
+ int length = 0;
+ int buffer = value & 0x7F;
+
+ while ((value >>= 7) != 0)
+ {
+ buffer <<= 8;
+ buffer |= ((value & 0x7F) | 0x80);
+ }
+
+ while (true)
+ {
+ length++;
+ if ((buffer & 0x80) != 0)
+ buffer >>>= 8;
+ else
+ break;
+ }
+
+ return length;
+ }
+
+ /**
+ * Write an int encoded in the MIDI-style variable length
+ * encoding format.
+ */
+ public synchronized void writeVariableLengthInt (int value)
+ throws IOException
+ {
+ int buffer = value & 0x7F;
+
+ while ((value >>= 7) != 0)
+ {
+ buffer <<= 8;
+ buffer |= ((value & 0x7F) | 0x80);
+ }
+
+ while (true)
+ {
+ writeByte(buffer & 0xff);
+ if ((buffer & 0x80) != 0)
+ buffer >>>= 8;
+ else
+ break;
+ }
+ }
+}
Index: gnu/javax/sound/midi/file/MidiFileWriter.java
===================================================================
RCS file: gnu/javax/sound/midi/file/MidiFileWriter.java
diff -N gnu/javax/sound/midi/file/MidiFileWriter.java
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ gnu/javax/sound/midi/file/MidiFileWriter.java 2 Jul 2006 18:10:13
-0000
@@ -0,0 +1,184 @@
+/* MidiFileWriter.java -- Write MIDI files.
+ Copyright (C) 2006 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath 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, or (at your option)
+any later version.
+
+GNU Classpath 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 GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.javax.sound.midi.file;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+import javax.sound.midi.MidiEvent;
+import javax.sound.midi.Sequence;
+import javax.sound.midi.Track;
+
+/**
+ * A MIDI file writer.
+ *
+ * This code writes MIDI file types 0 and 1.
+ *
+ * There are many decent documents on the web describing the MIDI file
+ * format. I didn't bother looking for the official document. If it
+ * exists, I'm not even sure if it is freely available. We should
+ * update this comment if we find out anything helpful here.
+ *
+ * @author Anthony Green ([EMAIL PROTECTED])
+ *
+ */
+public class MidiFileWriter
+ extends javax.sound.midi.spi.MidiFileWriter
+{
+ /* Return an array indicating which midi file types are supported.
+ * @see javax.sound.midi.spi.MidiFileWriter#getMidiFileTypes()
+ */
+ public int[] getMidiFileTypes()
+ {
+ return new int[]{0, 1};
+ }
+
+ /* Return an array indicating which midi file types are supported
+ * for a given Sequence.
+ * @see
javax.sound.midi.spi.MidiFileWriter#getMidiFileTypes(javax.sound.midi.Sequence)
+ */
+ public int[] getMidiFileTypes(Sequence sequence)
+ {
+ if (sequence.getTracks().length == 1)
+ return new int[]{0};
+ else
+ return new int[]{1};
+ }
+
+ /* Write a sequence to an output stream in standard midi format.
+ * @see javax.sound.midi.spi.MidiFileWriter#write(javax.sound.midi.Sequence,
int, java.io.OutputStream)
+ */
+ public int write(Sequence in, int fileType, OutputStream out)
+ throws IOException
+ {
+ MidiDataOutputStream dos = new MidiDataOutputStream (out);
+ Track[] tracks = in.getTracks();
+ dos.writeInt(0x4d546864); // MThd
+ dos.writeInt(6);
+ dos.writeShort(fileType);
+ dos.writeShort(tracks.length);
+ float divisionType = in.getDivisionType();
+ int resolution = in.getResolution();
+ // FIXME: division computation is incomplete.
+ int division = 0;
+ if (divisionType == Sequence.PPQ)
+ division = resolution & 0x7fff;
+ dos.writeShort(division);
+ int length = 14;
+ for (int i = 0; i < tracks.length; i++)
+ length += writeTrack(tracks[i], dos);
+ return length;
+ }
+
+ /**
+ * Compute the length of a track as it will be written to the
+ * output stream.
+ *
+ * @param track the track to measure
+ * @param dos a MidiDataOutputStream used for helper method
+ * @return the length of the track
+ */
+ private int computeTrackLength(Track track, MidiDataOutputStream dos)
+ {
+ int count = 0, length = 0, i = 0, eventCount = track.size();
+ long ptick = 0;
+ while (i < eventCount)
+ {
+ MidiEvent me = track.get(i);
+ long tick = me.getTick();
+ length += dos.variableLengthIntLength((int) (tick - ptick));
+ ptick = tick;
+ length += me.getMessage().getLength();
+ i++;
+ }
+ return length;
+ }
+
+ /**
+ * Write a track to an output stream.
+ *
+ * @param track the track to write
+ * @param dos a MidiDataOutputStream to write to
+ * @return the number of bytes written
+ */
+ private int writeTrack(Track track, MidiDataOutputStream dos)
+ throws IOException
+ {
+ int i = 0, elength = track.size(), trackLength;
+ MidiEvent pme = null;
+ dos.writeInt(0x4d54726b); // "MTrk"
+ trackLength = computeTrackLength(track, dos);
+ dos.writeInt(trackLength);
+ while (i < elength)
+ {
+ MidiEvent me = track.get(i);
+ int dtime = 0;
+ if (pme != null)
+ dtime = (int) (me.getTick() - pme.getTick());
+ dos.writeVariableLengthInt(dtime);
+ // FIXME: use running status byte
+ byte msg[] = me.getMessage().getMessage();
+ dos.write(msg);
+ pme = me;
+ i++;
+ }
+ // FIXME: if the last event isn't an end of track.. write that.
+ return trackLength + 8;
+ }
+
+ /* Write a Sequence to a file.
+ * @see javax.sound.midi.spi.MidiFileWriter#write(javax.sound.midi.Sequence,
int, java.io.File)
+ */
+ public int write(Sequence in, int fileType, File out) throws IOException
+ {
+ OutputStream os = new FileOutputStream(out);
+ try
+ {
+ return write(in, fileType, os);
+ }
+ finally
+ {
+ os.close();
+ }
+ }
+
+}
