1 /*
2 * Copyright (c) 1999, 2014, 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 javax.sound.sampled.AudioFormat;
29 import javax.sound.sampled.AudioInputStream;
30 import javax.sound.sampled.AudioSystem;
31
32 /**
33 * Common conversions etc.
34 *
35 * @author Kara Kytle
36 * @author Florian Bomers
37 */
38 public final class Toolkit {
39
40 /**
41 * Suppresses default constructor, ensuring non-instantiability.
42 */
43 private Toolkit() {
44 }
45
46 /**
47 * Converts bytes from signed to unsigned.
48 */
49 static void getUnsigned8(byte[] b, int off, int len) {
50 for (int i = off; i < (off+len); i++) {
51 b[i] += 128;
52 }
53 }
54
55
56 /**
57 * Swaps bytes.
58 * @throws ArrayOutOfBoundsException if len is not a multiple of 2.
59 */
60 static void getByteSwapped(byte[] b, int off, int len) {
61
62 byte tempByte;
63 for (int i = off; i < (off+len); i+=2) {
64
65 tempByte = b[i];
66 b[i] = b[i+1];
67 b[i+1] = tempByte;
68 }
69 }
70
71
72 /**
73 * Linear to DB scale conversion.
74 */
75 static float linearToDB(float linear) {
76
77 float dB = (float) (Math.log(((linear==0.0)?0.0001:linear))/Math.log(10.0) * 20.0);
78 return dB;
79 }
80
81
82 /**
83 * DB to linear scale conversion.
84 */
85 static float dBToLinear(float dB) {
86
87 float linear = (float) Math.pow(10.0, dB/20.0);
88 return linear;
89 }
90
91 /*
92 * returns bytes aligned to a multiple of blocksize
93 * the return value will be in the range of (bytes-blocksize+1) ... bytes
94 */
95 static long align(long bytes, int blockSize) {
96 // prevent null pointers
97 if (blockSize <= 1) {
98 return bytes;
99 }
100 return bytes - (bytes % blockSize);
101 }
102
103 static int align(int bytes, int blockSize) {
104 // prevent null pointers
105 if (blockSize <= 1) {
106 return bytes;
107 }
108 return bytes - (bytes % blockSize);
109 }
110
111
112 /*
113 * gets the number of bytes needed to play the specified number of milliseconds
114 */
115 static long millis2bytes(AudioFormat format, long millis) {
116 long result = (long) (millis * format.getFrameRate() / 1000.0f * format.getFrameSize());
117 return align(result, format.getFrameSize());
118 }
119
120 /*
121 * gets the time in milliseconds for the given number of bytes
122 */
123 static long bytes2millis(AudioFormat format, long bytes) {
124 return (long) (bytes / format.getFrameRate() * 1000.0f / format.getFrameSize());
125 }
126
127 /*
128 * gets the number of bytes needed to play the specified number of microseconds
129 */
130 static long micros2bytes(AudioFormat format, long micros) {
131 long result = (long) (micros * format.getFrameRate() / 1000000.0f * format.getFrameSize());
132 return align(result, format.getFrameSize());
133 }
134
135 /*
136 * gets the time in microseconds for the given number of bytes
137 */
138 static long bytes2micros(AudioFormat format, long bytes) {
139 return (long) (bytes / format.getFrameRate() * 1000000.0f / format.getFrameSize());
140 }
141
142 /*
143 * gets the number of frames needed to play the specified number of microseconds
144 */
145 static long micros2frames(AudioFormat format, long micros) {
146 return (long) (micros * format.getFrameRate() / 1000000.0f);
147 }
148
149 /*
150 * gets the time in microseconds for the given number of frames
151 */
152 static long frames2micros(AudioFormat format, long frames) {
153 return (long) (((double) frames) / format.getFrameRate() * 1000000.0d);
154 }
155
156 static void isFullySpecifiedAudioFormat(AudioFormat format) {
157 if (!format.getEncoding().equals(AudioFormat.Encoding.PCM_SIGNED)
158 && !format.getEncoding().equals(AudioFormat.Encoding.PCM_UNSIGNED)
159 && !format.getEncoding().equals(AudioFormat.Encoding.ULAW)
160 && !format.getEncoding().equals(AudioFormat.Encoding.ALAW)) {
161 // we don't know how to verify possibly non-linear encodings
162 return;
163 }
164 if (format.getFrameRate() <= 0) {
165 throw new IllegalArgumentException("invalid frame rate: "
166 +((format.getFrameRate()==-1)?
167 "NOT_SPECIFIED":String.valueOf(format.getFrameRate())));
168 }
169 if (format.getSampleRate() <= 0) {
170 throw new IllegalArgumentException("invalid sample rate: "
171 +((format.getSampleRate()==-1)?
172 "NOT_SPECIFIED":String.valueOf(format.getSampleRate())));
173 }
174 if (format.getSampleSizeInBits() <= 0) {
175 throw new IllegalArgumentException("invalid sample size in bits: "
176 +((format.getSampleSizeInBits()==-1)?
177 "NOT_SPECIFIED":String.valueOf(format.getSampleSizeInBits())));
178 }
179 if (format.getFrameSize() <= 0) {
180 throw new IllegalArgumentException("invalid frame size: "
181 +((format.getFrameSize()==-1)?
182 "NOT_SPECIFIED":String.valueOf(format.getFrameSize())));
183 }
184 if (format.getChannels() <= 0) {
185 throw new IllegalArgumentException("invalid number of channels: "
186 +((format.getChannels()==-1)?
187 "NOT_SPECIFIED":String.valueOf(format.getChannels())));
188 }
189 }
190
191
192 static boolean isFullySpecifiedPCMFormat(AudioFormat format) {
193 if (!format.getEncoding().equals(AudioFormat.Encoding.PCM_SIGNED)
194 && !format.getEncoding().equals(AudioFormat.Encoding.PCM_UNSIGNED)) {
195 return false;
196 }
197 if ((format.getFrameRate() <= 0)
198 || (format.getSampleRate() <= 0)
199 || (format.getSampleSizeInBits() <= 0)
200 || (format.getFrameSize() <= 0)
201 || (format.getChannels() <= 0)) {
202 return false;
203 }
204 return true;
205 }
206
207
208 public static AudioInputStream getPCMConvertedAudioInputStream(AudioInputStream ais) {
209 // we can't open the device for non-PCM playback, so we have
210 // convert any other encodings to PCM here (at least we try!)
211 AudioFormat af = ais.getFormat();
212
213 if( (!af.getEncoding().equals(AudioFormat.Encoding.PCM_SIGNED)) &&
214 (!af.getEncoding().equals(AudioFormat.Encoding.PCM_UNSIGNED))) {
215
216 try {
217 AudioFormat newFormat =
218 new AudioFormat( AudioFormat.Encoding.PCM_SIGNED,
219 af.getSampleRate(),
220 16,
221 af.getChannels(),
222 af.getChannels() * 2,
223 af.getSampleRate(),
224 Platform.isBigEndian());
225 ais = AudioSystem.getAudioInputStream(newFormat, ais);
226 } catch (Exception e) {
227 if (Printer.err) e.printStackTrace();
228 ais = null;
229 }
230 }
231
232 return ais;
233 }
234
235 }