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src/java.desktop/share/classes/com/sun/media/sound/MidiUtils.java

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   1 /*
   2  * Copyright (c) 2003, 2019, 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.util.ArrayList;
  29 
  30 import javax.sound.midi.InvalidMidiDataException;
  31 import javax.sound.midi.MetaMessage;
  32 import javax.sound.midi.MidiDevice;
  33 import javax.sound.midi.MidiEvent;
  34 import javax.sound.midi.MidiMessage;
  35 import javax.sound.midi.Sequence;
  36 import javax.sound.midi.Track;
  37 
  38 import static javax.sound.midi.SysexMessage.SPECIAL_SYSTEM_EXCLUSIVE;
  39 import static javax.sound.midi.SysexMessage.SYSTEM_EXCLUSIVE;
  40 
  41 // TODO:
  42 // - define and use a global symbolic constant for 60000000 (see convertTempo)
  43 
  44 /**
  45  * Some utilities for MIDI (some stuff is used from javax.sound.midi)
  46  *
  47  * @author Florian Bomers
  48  */
  49 public final class MidiUtils {
  50 
  51     public static final int DEFAULT_TEMPO_MPQ = 500000; // 120bpm
  52     public static final int META_END_OF_TRACK_TYPE = 0x2F;
  53     public static final int META_TEMPO_TYPE = 0x51;
  54 
  55     /**
  56      * Suppresses default constructor, ensuring non-instantiability.
  57      */
  58     private MidiUtils() {
  59     }
  60 
  61     /**
  62      * Returns an exception which should be thrown if MidiDevice is unsupported.
  63      *
  64      * @param  info an info object that describes the desired device
  65      * @return an exception instance
  66      */
  67     static RuntimeException unsupportedDevice(final MidiDevice.Info info) {
  68         return new IllegalArgumentException(String.format(
  69                 "MidiDevice %s not supported by this provider", info));
  70     }
  71 
  72     /**
  73      * Checks the status byte for the system exclusive message.
  74      *
  75      * @param  data the system exclusive message data
  76      * @param  length the length of the valid message data in the array
  77      * @throws InvalidMidiDataException if the status byte is invalid for a
  78      *         system exclusive message
  79      */
  80     public static void checkSysexStatus(final byte[] data, final int length)
  81             throws InvalidMidiDataException {
  82         if (data.length == 0 || length == 0) {
  83             throw new InvalidMidiDataException("Status byte is missing");
  84         }
  85         checkSysexStatus(data[0] & 0xFF);
  86     }
  87 
  88     /**
  89      * Checks the status byte for the system exclusive message.
  90      *
  91      * @param  status the status byte for the message (0xF0 or 0xF7)
  92      * @throws InvalidMidiDataException if the status byte is invalid for a
  93      *         system exclusive message
  94      */
  95     public static void checkSysexStatus(final int status)
  96             throws InvalidMidiDataException {
  97         if (status != SYSTEM_EXCLUSIVE && status != SPECIAL_SYSTEM_EXCLUSIVE) {
  98             throw new InvalidMidiDataException(String.format(
  99                     "Invalid status byte for sysex message: 0x%X", status));
 100         }
 101     }
 102 
 103     /** return true if the passed message is Meta End Of Track */
 104     public static boolean isMetaEndOfTrack(MidiMessage midiMsg) {
 105         // first check if it is a META message at all
 106         if (midiMsg.getLength() != 3
 107             || midiMsg.getStatus() != MetaMessage.META) {
 108             return false;
 109         }
 110         // now get message and check for end of track
 111         byte[] msg = midiMsg.getMessage();
 112         return ((msg[1] & 0xFF) == META_END_OF_TRACK_TYPE) && (msg[2] == 0);
 113     }
 114 
 115     /** return if the given message is a meta tempo message */
 116     public static boolean isMetaTempo(MidiMessage midiMsg) {
 117         // first check if it is a META message at all
 118         if (midiMsg.getLength() != 6
 119             || midiMsg.getStatus() != MetaMessage.META) {
 120             return false;


   1 /*
   2  * Copyright (c) 2003, 2014, 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.util.ArrayList;
  29 

  30 import javax.sound.midi.MetaMessage;
  31 import javax.sound.midi.MidiDevice;
  32 import javax.sound.midi.MidiEvent;
  33 import javax.sound.midi.MidiMessage;
  34 import javax.sound.midi.Sequence;
  35 import javax.sound.midi.Track;
  36 



  37 // TODO:
  38 // - define and use a global symbolic constant for 60000000 (see convertTempo)
  39 
  40 /**
  41  * Some utilities for MIDI (some stuff is used from javax.sound.midi)
  42  *
  43  * @author Florian Bomers
  44  */
  45 public final class MidiUtils {
  46 
  47     public static final int DEFAULT_TEMPO_MPQ = 500000; // 120bpm
  48     public static final int META_END_OF_TRACK_TYPE = 0x2F;
  49     public static final int META_TEMPO_TYPE = 0x51;
  50 
  51     /**
  52      * Suppresses default constructor, ensuring non-instantiability.
  53      */
  54     private MidiUtils() {
  55     }
  56 
  57     /**
  58      * Returns an exception which should be thrown if MidiDevice is unsupported.
  59      *
  60      * @param  info an info object that describes the desired device
  61      * @return an exception instance
  62      */
  63     static RuntimeException unsupportedDevice(final MidiDevice.Info info) {
  64         return new IllegalArgumentException(String.format(
  65                 "MidiDevice %s not supported by this provider", info));































  66     }
  67 
  68     /** return true if the passed message is Meta End Of Track */
  69     public static boolean isMetaEndOfTrack(MidiMessage midiMsg) {
  70         // first check if it is a META message at all
  71         if (midiMsg.getLength() != 3
  72             || midiMsg.getStatus() != MetaMessage.META) {
  73             return false;
  74         }
  75         // now get message and check for end of track
  76         byte[] msg = midiMsg.getMessage();
  77         return ((msg[1] & 0xFF) == META_END_OF_TRACK_TYPE) && (msg[2] == 0);
  78     }
  79 
  80     /** return if the given message is a meta tempo message */
  81     public static boolean isMetaTempo(MidiMessage midiMsg) {
  82         // first check if it is a META message at all
  83         if (midiMsg.getLength() != 6
  84             || midiMsg.getStatus() != MetaMessage.META) {
  85             return false;


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