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 getAudioFileFormat(final Sequence seq)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 getAudioInputStream(final Sequence seq)64 private AudioInputStream getAudioInputStream(final Sequence seq) 65 throws InvalidMidiDataException { 66 AudioSynthesizer synth = 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 getAudioInputStream(final InputStream stream)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 getAudioFileFormatImpl(final InputStream stream)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 } 151