1 /*
2 * Copyright (c) 1999, 2017, 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 javax.sound.sampled;
27
28 import java.util.Collections;
29 import java.util.HashMap;
30 import java.util.Map;
31 import java.util.Objects;
32
33 /**
34 * An instance of the {@code AudioFileFormat} class describes an audio file,
35 * including the file type, the file's length in bytes, the length in sample
36 * frames of the audio data contained in the file, and the format of the audio
37 * data.
38 * <p>
39 * The {@link AudioSystem} class includes methods for determining the format of
40 * an audio file, obtaining an audio input stream from an audio file, and
41 * writing an audio file from an audio input stream.
42 * <p>
43 * An {@code AudioFileFormat} object can include a set of properties. A property
44 * is a pair of key and value: the key is of type {@code String}, the associated
45 * property value is an arbitrary object. Properties specify additional
46 * informational meta data (like a author, copyright, or file duration).
47 * Properties are optional information, and file reader and file writer
48 * implementations are not required to provide or recognize properties.
49 * <p>
50 * The following table lists some common properties that should be used in
51 * implementations:
52 *
53 * <table class="striped">
54 * <caption>Audio File Format Properties</caption>
55 * <thead>
56 * <tr>
57 * <th scope="col">Property key
58 * <th scope="col">Value type
59 * <th scope="col">Description
60 * </thead>
61 * <tbody>
62 * <tr>
63 * <th scope="row">"duration"
64 * <td>{@link Long Long}
65 * <td>playback duration of the file in microseconds
66 * <tr>
67 * <th scope="row">"author"
68 * <td>{@link String String}
69 * <td>name of the author of this file
70 * <tr>
71 * <th scope="row">"title"
72 * <td>{@link String String}
73 * <td>title of this file
74 * <tr>
75 * <th scope="row">"copyright"
76 * <td>{@link String String}
77 * <td>copyright message
78 * <tr>
79 * <th scope="row">"date"
80 * <td>{@link java.util.Date Date}
81 * <td>date of the recording or release
82 * <tr>
83 * <th scope="row">"comment"
84 * <td>{@link String String}
85 * <td>an arbitrary text
86 * </tbody>
87 * </table>
88 *
89 * @author David Rivas
90 * @author Kara Kytle
91 * @author Florian Bomers
92 * @see AudioInputStream
93 * @since 1.3
94 */
95 public class AudioFileFormat {
96
97 /**
98 * File type.
99 */
100 private final Type type;
101
102 /**
103 * File length in bytes.
104 */
105 private final int byteLength;
106
107 /**
108 * Format of the audio data contained in the file.
109 */
110 private final AudioFormat format;
111
112 /**
113 * Audio data length in sample frames.
114 */
115 private final int frameLength;
116
117 /**
118 * The set of properties.
119 */
120 private HashMap<String, Object> properties;
121
122 /**
123 * Constructs an audio file format object. This protected constructor is
124 * intended for use by providers of file-reading services when returning
125 * information about an audio file or about supported audio file formats.
126 *
127 * @param type the type of the audio file
128 * @param byteLength the length of the file in bytes, or
129 * {@code AudioSystem.NOT_SPECIFIED}
130 * @param format the format of the audio data contained in the file
131 * @param frameLength the audio data length in sample frames, or
132 * {@code AudioSystem.NOT_SPECIFIED}
133 * @see #getType
134 */
135 protected AudioFileFormat(Type type, int byteLength, AudioFormat format, int frameLength) {
136
137 this.type = type;
138 this.byteLength = byteLength;
139 this.format = format;
140 this.frameLength = frameLength;
141 this.properties = null;
142 }
143
144 /**
145 * Constructs an audio file format object. This public constructor may be
146 * used by applications to describe the properties of a requested audio
147 * file.
148 *
149 * @param type the type of the audio file
150 * @param format the format of the audio data contained in the file
151 * @param frameLength the audio data length in sample frames, or
152 * {@code AudioSystem.NOT_SPECIFIED}
153 */
154 public AudioFileFormat(Type type, AudioFormat format, int frameLength) {
155
156
157 this(type,AudioSystem.NOT_SPECIFIED,format,frameLength);
158 }
159
160 /**
161 * Construct an audio file format object with a set of defined properties.
162 * This public constructor may be used by applications to describe the
163 * properties of a requested audio file. The properties map will be copied
164 * to prevent any changes to it.
165 *
166 * @param type the type of the audio file
167 * @param format the format of the audio data contained in the file
168 * @param frameLength the audio data length in sample frames, or
169 * {@code AudioSystem.NOT_SPECIFIED}
170 * @param properties a {@code Map<String, Object>} object with properties
171 * @since 1.5
172 */
173 public AudioFileFormat(Type type, AudioFormat format,
174 int frameLength, Map<String, Object> properties) {
175 this(type,AudioSystem.NOT_SPECIFIED,format,frameLength);
176 this.properties = new HashMap<>(properties);
177 }
178
179 /**
180 * Obtains the audio file type, such as {@code WAVE} or {@code AU}.
181 *
182 * @return the audio file type
183 * @see Type#WAVE
184 * @see Type#AU
185 * @see Type#AIFF
186 * @see Type#AIFC
187 * @see Type#SND
188 */
189 public Type getType() {
190 return type;
191 }
192
193 /**
194 * Obtains the size in bytes of the entire audio file (not just its audio
195 * data).
196 *
197 * @return the audio file length in bytes
198 * @see AudioSystem#NOT_SPECIFIED
199 */
200 public int getByteLength() {
201 return byteLength;
202 }
203
204 /**
205 * Obtains the format of the audio data contained in the audio file.
206 *
207 * @return the audio data format
208 */
209 public AudioFormat getFormat() {
210 return format;
211 }
212
213 /**
214 * Obtains the length of the audio data contained in the file, expressed in
215 * sample frames.
216 *
217 * @return the number of sample frames of audio data in the file
218 * @see AudioSystem#NOT_SPECIFIED
219 */
220 public int getFrameLength() {
221 return frameLength;
222 }
223
224 /**
225 * Obtain an unmodifiable map of properties. The concept of properties is
226 * further explained in the {@link AudioFileFormat class description}.
227 *
228 * @return a {@code Map<String, Object>} object containing all properties.
229 * If no properties are recognized, an empty map is returned.
230 * @see #getProperty(String)
231 * @since 1.5
232 */
233 @SuppressWarnings("unchecked") // Cast of result of clone
234 public Map<String, Object> properties() {
235 Map<String,Object> ret;
236 if (properties == null) {
237 ret = new HashMap<>(0);
238 } else {
239 ret = (Map<String,Object>) (properties.clone());
240 }
241 return Collections.unmodifiableMap(ret);
242 }
243
244 /**
245 * Obtain the property value specified by the key. The concept of properties
246 * is further explained in the {@link AudioFileFormat class description}.
247 * <p>
248 * If the specified property is not defined for a particular file format,
249 * this method returns {@code null}.
250 *
251 * @param key the key of the desired property
252 * @return the value of the property with the specified key, or {@code null}
253 * if the property does not exist
254 * @see #properties()
255 * @since 1.5
256 */
257 public Object getProperty(String key) {
258 if (properties == null) {
259 return null;
260 }
261 return properties.get(key);
262 }
263
264 /**
265 * Provides a string representation of the file format.
266 *
267 * @return the file format as a string
268 */
269 @Override
270 public String toString() {
271
272 StringBuffer buf = new StringBuffer();
273
274 //$$fb2002-11-01: fix for 4672864: AudioFileFormat.toString() throws unexpected NullPointerException
275 if (type != null) {
276 buf.append(type.toString() + " (." + type.getExtension() + ") file");
277 } else {
278 buf.append("unknown file format");
279 }
280
281 if (byteLength != AudioSystem.NOT_SPECIFIED) {
282 buf.append(", byte length: " + byteLength);
283 }
284
285 buf.append(", data format: " + format);
286
287 if (frameLength != AudioSystem.NOT_SPECIFIED) {
288 buf.append(", frame length: " + frameLength);
289 }
290
291 return new String(buf);
292 }
293
294 /**
295 * An instance of the {@code Type} class represents one of the standard
296 * types of audio file. Static instances are provided for the common types.
297 */
298 public static class Type {
299
300 // FILE FORMAT TYPE DEFINES
301
302 /**
303 * Specifies a WAVE file.
304 */
305 public static final Type WAVE = new Type("WAVE", "wav");
306
307 /**
308 * Specifies an AU file.
309 */
310 public static final Type AU = new Type("AU", "au");
311
312 /**
313 * Specifies an AIFF file.
314 */
315 public static final Type AIFF = new Type("AIFF", "aif");
316
317 /**
318 * Specifies an AIFF-C file.
319 */
320 public static final Type AIFC = new Type("AIFF-C", "aifc");
321
322 /**
323 * Specifies a SND file.
324 */
325 public static final Type SND = new Type("SND", "snd");
326
327 /**
328 * File type name.
329 */
330 private final String name;
331
332 /**
333 * File type extension.
334 */
335 private final String extension;
336
337 /**
338 * Constructs a file type.
339 *
340 * @param name the string that names the file type
341 * @param extension the string that commonly marks the file type
342 * without leading dot
343 */
344 public Type(final String name, final String extension) {
345 this.name = name;
346 this.extension = extension;
347 }
348
349 /**
350 * Indicates whether the specified object is equal to this file type,
351 * returning {@code true} if the objects are equal.
352 *
353 * @param obj the reference object with which to compare
354 * @return {@code true} if the specified object is equal to this file
355 * type; {@code false} otherwise
356 */
357 @Override
358 public final boolean equals(final Object obj) {
359 if (this == obj) {
360 return true;
361 }
362 if (!(obj instanceof Type)) {
363 return false;
364 }
365 return Objects.equals(name, ((Type) obj).name);
366 }
367
368 /**
369 * Returns a hash code value for this file type.
370 *
371 * @return a hash code value for this file type
372 */
373 @Override
374 public final int hashCode() {
375 return name != null ? name.hashCode() : 0;
376 }
377
378 /**
379 * Provides the file type's name as the {@code String} representation of
380 * the file type.
381 *
382 * @return the file type's name
383 */
384 @Override
385 public final String toString() {
386 return name;
387 }
388
389 /**
390 * Obtains the common file name extension for this file type.
391 *
392 * @return file type extension
393 */
394 public String getExtension() {
395 return extension;
396 }
397 }
398 }