1 /*
2 * Copyright (c) 2007, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.media.sound;
27
28 import java.io.EOFException;
29 import java.io.IOException;
30 import java.io.InputStream;
31
32 import javax.sound.midi.InvalidMidiDataException;
33 import javax.sound.midi.MetaMessage;
34 import javax.sound.midi.MidiEvent;
35 import javax.sound.midi.MidiMessage;
36 import javax.sound.midi.MidiSystem;
37 import javax.sound.midi.MidiUnavailableException;
38 import javax.sound.midi.Receiver;
39 import javax.sound.midi.Sequence;
40 import javax.sound.midi.Track;
41 import javax.sound.sampled.AudioFileFormat.Type;
42 import javax.sound.sampled.AudioFormat;
43 import javax.sound.sampled.AudioInputStream;
44 import javax.sound.sampled.UnsupportedAudioFileException;
45
46 /**
47 * MIDI File Audio Renderer/Reader.
48 *
49 * @author Karl Helgason
50 */
51 public final class SoftMidiAudioFileReader extends SunFileReader {
52
53 private static final Type MIDI = new Type("MIDI", "mid");
54
55 private static final AudioFormat format = new AudioFormat(44100, 16, 2,
56 true, false);
57
58 private static StandardFileFormat getAudioFileFormat(final Sequence seq) {
59 long totallen = seq.getMicrosecondLength() / 1000000;
60 long len = (long) (format.getFrameRate() * (totallen + 4));
61 return new StandardFileFormat(MIDI, format, len);
62 }
63
64 private AudioInputStream getAudioInputStream(final Sequence seq)
65 throws InvalidMidiDataException {
66 AudioSynthesizer synth = (AudioSynthesizer) new SoftSynthesizer();
67 AudioInputStream stream;
68 Receiver recv;
69 try {
70 stream = synth.openStream(format, null);
71 recv = synth.getReceiver();
72 } catch (MidiUnavailableException e) {
73 throw new InvalidMidiDataException(e.toString());
74 }
75 float divtype = seq.getDivisionType();
76 Track[] tracks = seq.getTracks();
77 int[] trackspos = new int[tracks.length];
78 int mpq = 500000;
79 int seqres = seq.getResolution();
80 long lasttick = 0;
81 long curtime = 0;
82 while (true) {
83 MidiEvent selevent = null;
84 int seltrack = -1;
85 for (int i = 0; i < tracks.length; i++) {
86 int trackpos = trackspos[i];
87 Track track = tracks[i];
88 if (trackpos < track.size()) {
89 MidiEvent event = track.get(trackpos);
90 if (selevent == null || event.getTick() < selevent.getTick()) {
91 selevent = event;
92 seltrack = i;
93 }
94 }
95 }
96 if (seltrack == -1)
97 break;
98 trackspos[seltrack]++;
99 long tick = selevent.getTick();
100 if (divtype == Sequence.PPQ)
101 curtime += ((tick - lasttick) * mpq) / seqres;
102 else
103 curtime = (long) ((tick * 1000000.0 * divtype) / seqres);
104 lasttick = tick;
105 MidiMessage msg = selevent.getMessage();
106 if (msg instanceof MetaMessage) {
107 if (divtype == Sequence.PPQ) {
108 if (((MetaMessage) msg).getType() == 0x51) {
109 byte[] data = ((MetaMessage) msg).getData();
110 if (data.length < 3) {
111 throw new InvalidMidiDataException();
112 }
113 mpq = ((data[0] & 0xff) << 16)
114 | ((data[1] & 0xff) << 8) | (data[2] & 0xff);
115 }
116 }
117 } else {
118 recv.send(msg, curtime);
119 }
120 }
121
122 long totallen = curtime / 1000000;
123 long len = (long) (stream.getFormat().getFrameRate() * (totallen + 4));
124 stream = new AudioInputStream(stream, stream.getFormat(), len);
125 return stream;
126 }
127
128 @Override
129 public AudioInputStream getAudioInputStream(final InputStream stream)
130 throws UnsupportedAudioFileException, IOException {
131 stream.mark(200);
132 try {
133 return getAudioInputStream(MidiSystem.getSequence(stream));
134 } catch (InvalidMidiDataException | EOFException ignored) {
135 // stream is unsupported or the header is less than was expected
136 stream.reset();
137 throw new UnsupportedAudioFileException();
138 }
139 }
140
141 @Override
142 StandardFileFormat getAudioFileFormatImpl(final InputStream stream)
143 throws UnsupportedAudioFileException, IOException {
144 try {
145 return getAudioFileFormat(MidiSystem.getSequence(stream));
146 } catch (final InvalidMidiDataException ignored) {
147 throw new UnsupportedAudioFileException();
148 }
149 }
150 }