old-autovect-branch/libjava/classpath/javax/sound/midi/Sequence.java

   1 /* Sequence.java -- A sequence of MIDI events
   2    Copyright (C) 2005 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package javax.sound.midi;
  40
  41 import java.util.Iterator;
  42 import java.util.Vector;
  43
  44 /**
  45  * Objects of this type represent sequences of MIDI messages that can be
  46  * played back by a Sequencer.
  47  *
  48  * @author Anthony Green (green@redhat.com)
  49  * @since 1.3
  50  *
  51  */
  52 public class Sequence
  53 {
  54   /**
  55    * The timing division type for this sequence (PPQ or SMPTE*)
  56    */
  57   protected float divisionType;
  58
  59   /**
  60    * The timing resolution in ticks/beat or ticks/frame, depending on the
  61    * division type.
  62    */
  63   protected int resolution;
  64
  65   /**
  66    * The MIDI tracks used by this sequence.
  67    */
  68   protected Vector tracks;
  69
  70   /**
  71    * Tempo-based timing.  Resolution is specified in ticks per beat.
  72    */
  73   public static final float PPQ = 0.0f;
  74
  75   /**
  76    * 24 frames/second timing.  Resolution is specific in ticks per frame.
  77    */
  78   public static final float SMPTE_24 = 24.0f;
  79
  80   /**
  81    * 25 frames/second timing.  Resolution is specific in ticks per frame.
  82    */
  83   public static final float SMPTE_25 = 25.0f;
  84
  85   /**
  86    * 30 frames/second timing.  Resolution is specific in ticks per frame.
  87    */
  88   public static final float SMPTE_30 = 30.0f;
  89
  90   /**
  91    * 29.97 frames/second timing.  Resolution is specific in ticks per frame.
  92    */
  93   public static final float SMPTE_30DROP = 29.97f;
  94
  95   // Private helper class
  96   private void init(float divisionType, int resolution, int numTracks)
  97     throws InvalidMidiDataException
  98   {
  99     if (divisionType != PPQ
 100         && divisionType != SMPTE_24
 101         && divisionType != SMPTE_25
 102         && divisionType != SMPTE_30
 103         && divisionType != SMPTE_30DROP)
 104       throw new InvalidMidiDataException("Invalid division type ("
 105                                          + divisionType + ")");
 106
 107     this.divisionType = divisionType;
 108     this.resolution = resolution;
 109
 110     tracks = new Vector(numTracks);
 111     while (numTracks > 0)
 112       tracks.set(--numTracks, new Track());
 113   }
 114
 115   /**
 116    * Create a MIDI sequence object with no initial tracks.
 117    *
 118    * @param divisionType the division type (must be one of PPQ or SMPTE_*)
 119    * @param resolution the timing resolution
 120    * @throws InvalidMidiDataException if the division type is invalid
 121    */
 122   public Sequence(float divisionType, int resolution)
 123     throws InvalidMidiDataException
 124   {
 125     init(divisionType, resolution, 0);
 126   }
 127
 128   /**
 129    * Create a MIDI seqence object.
 130    *
 131    * @param divisionType the division type (must be one of PPQ or SMPTE_*)
 132    * @param resolution the timing resolution
 133    * @param numTracks the number of initial tracks
 134    * @throws InvalidMidiDataException if the division type is invalid
 135    */
 136   public Sequence(float divisionType, int resolution, int numTracks)
 137     throws InvalidMidiDataException
 138   {
 139     init(divisionType, resolution, 0);
 140   }
 141
 142   /**
 143    * The division type of this sequence.
 144    *
 145    * @return division type of this sequence
 146    */
 147   public float getDivisionType()
 148   {
 149     return divisionType;
 150   }
 151
 152   /**
 153    * The timing resolution for this sequence, relative to the division type.
 154    *
 155    * @return the timing resolution for this sequence
 156    */
 157   public int getResolution()
 158   {
 159     return resolution;
 160   }
 161
 162   /**
 163    * Create a new empty MIDI track and add it to this sequence.
 164    *
 165    * @return the newly create MIDI track
 166    */
 167   public Track createTrack()
 168   {
 169     Track track = new Track();
 170     tracks.add(track);
 171     return track;
 172   }
 173
 174   /**
 175    * Remove the specified MIDI track from this sequence.
 176    *
 177    * @param track the track to remove
 178    * @return true if track was removed and false othewise
 179    */
 180   public boolean deleteTrack(Track track)
 181   {
 182     return tracks.remove(track);
 183   }
 184
 185   /**
 186    * Get an array of MIDI tracks used in this sequence.
 187    *
 188    * @return a possibly empty array of tracks
 189    */
 190   public Track[] getTracks()
 191   {
 192     return (Track[]) tracks.toArray(new Track[tracks.size()]);
 193   }
 194
 195   /**
 196    * The length of this sequence in microseconds.
 197    *
 198    * @return the length of this sequence in microseconds
 199    */
 200   public long getMicrosecondLength()
 201   {
 202     long tickLength = getTickLength();
 203
 204     if (divisionType == PPQ)
 205     {
 206       // FIXME
 207       // How can this possible be computed?  PPQ is pulses per quarter-note,
 208       // which is dependent on the tempo of the Sequencer.
 209       throw new
 210           UnsupportedOperationException("Can't compute PPQ based lengths yet");
 211     }
 212     else
 213     {
 214       // This is a fixed tick per frame computation
 215       return (long) ((tickLength * 1000000) / (divisionType * resolution));
 216     }
 217   }
 218
 219   /**
 220    * The length of this sequence in MIDI ticks.
 221    *
 222    * @return the length of this sequence in MIDI ticks
 223    */
 224   public long getTickLength()
 225   {
 226     long length = 0;
 227     Iterator itr = tracks.iterator();
 228     while (itr.hasNext())
 229     {
 230       Track track = (Track) itr.next();
 231       long trackTicks = track.ticks();
 232       if (trackTicks > length)
 233         length = trackTicks;
 234     }
 235     return length;
 236   }
 237
 238   /**
 239    * Get an array of patches used in this sequence.
 240    *
 241    * @return an array of patches used in this sequence
 242    */
 243   public Patch[] getPatchList()
 244   {
 245     // FIXE: not quite sure how to do this yet.
 246     throw new UnsupportedOperationException("Can't get patch list yet");
 247   }
 248 }