001 /* MidiFileWriter.java -- MIDI file writing services 002 Copyright (C) 2005 Free Software Foundation, Inc. 003 004 This file is part of GNU Classpath. 005 006 GNU Classpath is free software; you can redistribute it and/or modify 007 it under the terms of the GNU General Public License as published by 008 the Free Software Foundation; either version 2, or (at your option) 009 any later version. 010 011 GNU Classpath is distributed in the hope that it will be useful, but 012 WITHOUT ANY WARRANTY; without even the implied warranty of 013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 General Public License for more details. 015 016 You should have received a copy of the GNU General Public License 017 along with GNU Classpath; see the file COPYING. If not, write to the 018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 019 02110-1301 USA. 020 021 Linking this library statically or dynamically with other modules is 022 making a combined work based on this library. Thus, the terms and 023 conditions of the GNU General Public License cover the whole 024 combination. 025 026 As a special exception, the copyright holders of this library give you 027 permission to link this library with independent modules to produce an 028 executable, regardless of the license terms of these independent 029 modules, and to copy and distribute the resulting executable under 030 terms of your choice, provided that you also meet, for each linked 031 independent module, the terms and conditions of the license of that 032 module. An independent module is a module which is not derived from 033 or based on this library. If you modify this library, you may extend 034 this exception to your version of the library, but you are not 035 obligated to do so. If you do not wish to do so, delete this 036 exception statement from your version. */ 037 038 039 package javax.sound.midi.spi; 040 041 import java.io.File; 042 import java.io.IOException; 043 import java.io.OutputStream; 044 045 import javax.sound.midi.Sequence; 046 047 /** 048 * MidiFileWriter provides MIDI file writing services. 049 * 050 * There are three types of Standard MIDI File (SMF) formats, 051 * represented by integers 0, 1, and 2. 052 * 053 * Type 0 files contain a single track and represents a single song 054 * performance. 055 * Type 1 may contain multiple tracks for a single song performance. 056 * Type 2 may contain multiple tracks, each representing a 057 * separate song performance. 058 * 059 * See http://en.wikipedia.org/wiki/MIDI#MIDI_file_formats for more 060 * information. 061 * 062 * @author Anthony Green (green@redhat.com) 063 * @since 1.3 064 * 065 */ 066 public abstract class MidiFileWriter 067 { 068 /** 069 * Return the MIDI file types supported by this writer. 070 * 071 * @return the MIDI file types, or an empty array 072 */ 073 public abstract int[] getMidiFileTypes(); 074 075 /** 076 * Return the MIDI file types supported by this writer for the 077 * given sequence. 078 * 079 * @param sequence the sequence we'd like to write 080 * @return the MIDI file types, or an empty array 081 */ 082 public abstract int[] getMidiFileTypes(Sequence sequence); 083 084 /** 085 * Returns true if this writer supports the given file type. 086 * 087 * @param fileType the file type we're asking about 088 * @return true if this writer supports fileType, false otherwise 089 */ 090 public boolean isFileTypeSupported(int fileType) 091 { 092 int types[] = getMidiFileTypes(); 093 for (int i = types.length; i > 0;) 094 { 095 if (types[--i] == fileType) 096 return true; 097 } 098 return false; 099 } 100 101 /** 102 * Returns true if this writer supports the given file type for the 103 * given sequence. 104 * 105 * @param fileType the file type we're asking about 106 * @param sequence the sequence we'd like to write 107 * @return true if this writer supports fileType, false otherwise 108 */ 109 public boolean isFileTypeSupported(int fileType, Sequence sequence) 110 { 111 int types[] = getMidiFileTypes(sequence); 112 for (int i = types.length; i > 0;) 113 { 114 if (types[--i] == fileType) 115 return true; 116 } 117 return false; 118 } 119 120 /** 121 * Write a sequence to a stream using the specified MIDI file type. 122 * 123 * @param in the sequence to write 124 * @param fileType the MIDI file type to use 125 * @param out the output stream to write to 126 * @return the number of byte written 127 * @throws IOException if an I/O exception happens 128 */ 129 public abstract int write(Sequence in, int fileType, OutputStream out) 130 throws IOException; 131 132 /** 133 * Write a sequence to a file using the specified MIDI file type. 134 * 135 * @param in the sequence to write 136 * @param fileType the MIDI file type to use 137 * @param out the file to write to 138 * @return the number of byte written 139 * @throws IOException if an I/O exception happens 140 */ 141 public abstract int write(Sequence in, int fileType, File out) 142 throws IOException; 143 }