1 /*
2 * Copyright 1999-2003 Sun Microsystems, Inc. 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. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 package javax.sound.sampled.spi;
27
28 import java.io.InputStream;
29
30 import javax.sound.sampled.AudioFormat;
31 import javax.sound.sampled.AudioInputStream;
32
33 /**
34 * A format conversion provider provides format conversion services
35 * from one or more input formats to one or more output formats.
36 * Converters include codecs, which encode and/or decode audio data,
37 * as well as transcoders, etc. Format converters provide methods for
38 * determining what conversions are supported and for obtaining an audio
39 * stream from which converted data can be read.
40 * <p>
41 * The source format represents the format of the incoming
42 * audio data, which will be converted.
43 * <p>
44 * The target format represents the format of the processed, converted
45 * audio data. This is the format of the data that can be read from
46 * the stream returned by one of the <code>getAudioInputStream</code> methods.
47 *
48 * @author Kara Kytle
49 * @since 1.3
50 */
51 public abstract class FormatConversionProvider {
52
53
54 // NEW METHODS
55
56 /**
57 * Obtains the set of source format encodings from which format
58 * conversion services are provided by this provider.
59 * @return array of source format encodings. If for some reason provider
60 * does not provide any conversion services, an array of length 0 is
61 * returned.
62 */
63 public abstract AudioFormat.Encoding[] getSourceEncodings();
64
65
66 /**
67 * Obtains the set of target format encodings to which format
68 * conversion services are provided by this provider.
69 * @return array of target format encodings. If for some reason provider
70 * does not provide any conversion services, an array of length 0 is
71 * returned.
72 */
73 public abstract AudioFormat.Encoding[] getTargetEncodings();
74
75
76 /**
77 * Indicates whether the format converter supports conversion from the
78 * specified source format encoding.
79 * @param sourceEncoding the source format encoding for which support is queried
80 * @return <code>true</code> if the encoding is supported, otherwise <code>false</code>
81 */
82 public boolean isSourceEncodingSupported(AudioFormat.Encoding sourceEncoding){
83
84 AudioFormat.Encoding sourceEncodings[] = getSourceEncodings();
85
86 for(int i=0; i<sourceEncodings.length; i++) {
87 if( sourceEncoding.equals( sourceEncodings[i]) ) {
88 return true;
89 }
90 }
91 return false;
92 }
93
94
95 /**
96 * Indicates whether the format converter supports conversion to the
97 * specified target format encoding.
98 * @param targetEncoding the target format encoding for which support is queried
99 * @return <code>true</code> if the encoding is supported, otherwise <code>false</code>
100 */
101 public boolean isTargetEncodingSupported(AudioFormat.Encoding targetEncoding){
102
103 AudioFormat.Encoding targetEncodings[] = getTargetEncodings();
104
105 for(int i=0; i<targetEncodings.length; i++) {
106 if( targetEncoding.equals( targetEncodings[i]) ) {
107 return true;
108 }
109 }
110 return false;
111 }
112
113
114 /**
115 * Obtains the set of target format encodings supported by the format converter
116 * given a particular source format.
117 * If no target format encodings are supported for this source format,
118 * an array of length 0 is returned.
119 * @return array of supported target format encodings.
120 */
121 public abstract AudioFormat.Encoding[] getTargetEncodings(AudioFormat sourceFormat);
122
123
124 /**
125 * Indicates whether the format converter supports conversion to a particular encoding
126 * from a particular format.
127 * @param targetEncoding desired encoding of the outgoing data
128 * @param sourceFormat format of the incoming data
129 * @return <code>true</code> if the conversion is supported, otherwise <code>false</code>
130 */
131 public boolean isConversionSupported(AudioFormat.Encoding targetEncoding, AudioFormat sourceFormat){
132
133 AudioFormat.Encoding targetEncodings[] = getTargetEncodings(sourceFormat);
134
135 for(int i=0; i<targetEncodings.length; i++) {
136 if( targetEncoding.equals( targetEncodings[i]) ) {
137 return true;
138 }
139 }
140 return false;
141 }
142
143
144 /**
145 * Obtains the set of target formats with the encoding specified
146 * supported by the format converter
147 * If no target formats with the specified encoding are supported
148 * for this source format, an array of length 0 is returned.
149 * @return array of supported target formats.
150 */
151 public abstract AudioFormat[] getTargetFormats(AudioFormat.Encoding targetEncoding, AudioFormat sourceFormat);
152
153
154 /**
155 * Indicates whether the format converter supports conversion to one
156 * particular format from another.
157 * @param targetFormat desired format of outgoing data
158 * @param sourceFormat format of the incoming data
159 * @return <code>true</code> if the conversion is supported, otherwise <code>false</code>
160 */
161 public boolean isConversionSupported(AudioFormat targetFormat, AudioFormat sourceFormat){
162
163 AudioFormat targetFormats[] = getTargetFormats( targetFormat.getEncoding(), sourceFormat );
164
165 for(int i=0; i<targetFormats.length; i++) {
166 if( targetFormat.matches( targetFormats[i] ) ) {
167 return true;
168 }
169 }
170 return false;
171 }
172
173
174 /**
175 * Obtains an audio input stream with the specified encoding from the given audio
176 * input stream.
177 * @param targetEncoding desired encoding of the stream after processing
178 * @param sourceStream stream from which data to be processed should be read
179 * @return stream from which processed data with the specified target encoding may be read
180 * @throws IllegalArgumentException if the format combination supplied is
181 * not supported.
182 */
183 public abstract AudioInputStream getAudioInputStream(AudioFormat.Encoding targetEncoding, AudioInputStream sourceStream);
184
185
186 /**
187 * Obtains an audio input stream with the specified format from the given audio
188 * input stream.
189 * @param targetFormat desired data format of the stream after processing
190 * @param sourceStream stream from which data to be processed should be read
191 * @return stream from which processed data with the specified format may be read
192 * @throws IllegalArgumentException if the format combination supplied is
193 * not supported.
194 */
195 public abstract AudioInputStream getAudioInputStream(AudioFormat targetFormat, AudioInputStream sourceStream);
196
197 }
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