1 /*
2 * Copyright (c) 1999, 2016, 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.io.DataInputStream;
29 import java.io.IOException;
30 import java.io.InputStream;
31
32 import javax.sound.sampled.AudioFileFormat.Type;
33 import javax.sound.sampled.AudioFormat;
34 import javax.sound.sampled.AudioSystem;
35 import javax.sound.sampled.UnsupportedAudioFileException;
36
37 /**
38 * AU file reader.
39 *
40 * @author Kara Kytle
41 * @author Jan Borgersen
42 * @author Florian Bomers
43 */
44 public final class AuFileReader extends SunFileReader {
45
46 @Override
47 StandardFileFormat getAudioFileFormatImpl(final InputStream stream)
48 throws UnsupportedAudioFileException, IOException {
49 final DataInputStream dis = new DataInputStream(stream);
50 final int magic = dis.readInt();
51
52 if (magic != AuFileFormat.AU_SUN_MAGIC) {
53 // not AU, throw exception
54 throw new UnsupportedAudioFileException("not an AU file");
55 }
56
57 final int headerSize = dis.readInt();
58 if (headerSize < AuFileFormat.AU_HEADERSIZE) {
59 throw new UnsupportedAudioFileException("Invalid header size");
60 }
61 final long /* unsigned int */ dataSize = dis.readInt() & 0xffffffffL;
62 final int auType = dis.readInt();
63 final int sampleRate = dis.readInt();
64 if (sampleRate <= 0) {
65 throw new UnsupportedAudioFileException("Invalid sample rate");
66 }
67 final int channels = dis.readInt();
68 if (channels <= 0) {
69 throw new UnsupportedAudioFileException("Invalid number of channels");
70 }
71
72 final int sampleSizeInBits;
73 final AudioFormat.Encoding encoding;
74 switch (auType) {
75 case AuFileFormat.AU_ULAW_8:
76 encoding = AudioFormat.Encoding.ULAW;
77 sampleSizeInBits = 8;
78 break;
79 case AuFileFormat.AU_ALAW_8:
80 encoding = AudioFormat.Encoding.ALAW;
81 sampleSizeInBits = 8;
82 break;
83 case AuFileFormat.AU_LINEAR_8:
84 // $$jb: 04.29.99: 8bit linear is *signed*, not *unsigned*
85 encoding = AudioFormat.Encoding.PCM_SIGNED;
86 sampleSizeInBits = 8;
87 break;
88 case AuFileFormat.AU_LINEAR_16:
89 encoding = AudioFormat.Encoding.PCM_SIGNED;
90 sampleSizeInBits = 16;
91 break;
92 case AuFileFormat.AU_LINEAR_24:
93 encoding = AudioFormat.Encoding.PCM_SIGNED;
94 sampleSizeInBits = 24;
95 break;
96 case AuFileFormat.AU_LINEAR_32:
97 encoding = AudioFormat.Encoding.PCM_SIGNED;
98 sampleSizeInBits = 32;
99 break;
100 case AuFileFormat.AU_FLOAT:
101 encoding = AudioFormat.Encoding.PCM_FLOAT;
102 sampleSizeInBits = 32;
103 break;
104 // we don't support these ...
105 /* case AuFileFormat.AU_DOUBLE:
106 encoding = new AudioFormat.DOUBLE;
107 sampleSizeInBits = 8;
108 break;
109 case AuFileFormat.AU_ADPCM_G721:
110 encoding = new AudioFormat.G721_ADPCM;
111 sampleSizeInBits = 16;
112 break;
113 case AuFileFormat.AU_ADPCM_G723_3:
114 encoding = new AudioFormat.G723_3;
115 sampleSize = 24;
116 SamplePerUnit = 8;
117 break;
118 case AuFileFormat.AU_ADPCM_G723_5:
119 encoding = new AudioFormat.G723_5;
120 sampleSize = 40;
121 SamplePerUnit = 8;
122 break;
123 */
124 default:
125 // unsupported filetype, throw exception
126 throw new UnsupportedAudioFileException("not a valid AU file");
127 }
128
129 // Skip the variable-length annotation field. The content of this field
130 // is currently undefined by AU specification and is unsupported by
131 // JavaSound, so seek past the header
132 dis.skipBytes(headerSize - AuFileFormat.AU_HEADERSIZE);
133
134 // Even if the sampleSizeInBits and channels are supported we can get an
135 // unsupported frameSize because of overflow
136 final int frameSize = calculatePCMFrameSize(sampleSizeInBits, channels);
137 if (frameSize <= 0) {
138 throw new UnsupportedAudioFileException("Invalid frame size");
139 }
140
141 //$$fb 2002-11-02: fix for 4629669: AU file reader: problems with empty files
142 //$$fb 2003-10-20: fix for 4940459: AudioInputStream.getFrameLength() returns 0 instead of NOT_SPECIFIED
143 long frameLength = AudioSystem.NOT_SPECIFIED;
144 long byteLength = AudioSystem.NOT_SPECIFIED;
145 if (dataSize != AuFileFormat.UNKNOWN_SIZE) {
146 frameLength = dataSize / frameSize;
147 byteLength = dataSize + headerSize;
148 }
149 final AudioFormat format = new AudioFormat(encoding, sampleRate,
150 sampleSizeInBits, channels,
151 frameSize, sampleRate, true);
152 return new AuFileFormat(Type.AU, byteLength, format, frameLength);
153 }
154 }