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Diffstat (limited to 'songdbj/javazoom/jl/decoder/Obuffer.java')
-rw-r--r-- | songdbj/javazoom/jl/decoder/Obuffer.java | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/songdbj/javazoom/jl/decoder/Obuffer.java b/songdbj/javazoom/jl/decoder/Obuffer.java new file mode 100644 index 0000000000..45a71a9baf --- /dev/null +++ b/songdbj/javazoom/jl/decoder/Obuffer.java | |||
@@ -0,0 +1,88 @@ | |||
1 | /* | ||
2 | * 11/19/04 1.0 moved to LGPL. | ||
3 | * 12/12/99 Added appendSamples() method for efficiency. MDM. | ||
4 | * 15/02/99 ,Java Conversion by E.B ,ebsp@iname.com, JavaLayer | ||
5 | * | ||
6 | * Declarations for output buffer, includes operating system | ||
7 | * implementation of the virtual Obuffer. Optional routines | ||
8 | * enabling seeks and stops added by Jeff Tsay. | ||
9 | * | ||
10 | * @(#) obuffer.h 1.8, last edit: 6/15/94 16:51:56 | ||
11 | * @(#) Copyright (C) 1993, 1994 Tobias Bading (bading@cs.tu-berlin.de) | ||
12 | * @(#) Berlin University of Technology | ||
13 | * | ||
14 | * Idea and first implementation for u-law output with fast downsampling by | ||
15 | * Jim Boucher (jboucher@flash.bu.edu) | ||
16 | * | ||
17 | * LinuxObuffer class written by | ||
18 | * Louis P. Kruger (lpkruger@phoenix.princeton.edu) | ||
19 | *----------------------------------------------------------------------- | ||
20 | * This program is free software; you can redistribute it and/or modify | ||
21 | * it under the terms of the GNU Library General Public License as published | ||
22 | * by the Free Software Foundation; either version 2 of the License, or | ||
23 | * (at your option) any later version. | ||
24 | * | ||
25 | * This program is distributed in the hope that it will be useful, | ||
26 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
27 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
28 | * GNU Library General Public License for more details. | ||
29 | * | ||
30 | * You should have received a copy of the GNU Library General Public | ||
31 | * License along with this program; if not, write to the Free Software | ||
32 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | ||
33 | *---------------------------------------------------------------------- | ||
34 | */ | ||
35 | package javazoom.jl.decoder; | ||
36 | |||
37 | /** | ||
38 | * Base Class for audio output. | ||
39 | */ | ||
40 | public abstract class Obuffer | ||
41 | { | ||
42 | public static final int OBUFFERSIZE = 2 * 1152; // max. 2 * 1152 samples per frame | ||
43 | public static final int MAXCHANNELS = 2; // max. number of channels | ||
44 | |||
45 | /** | ||
46 | * Takes a 16 Bit PCM sample. | ||
47 | */ | ||
48 | public abstract void append(int channel, short value); | ||
49 | |||
50 | /** | ||
51 | * Accepts 32 new PCM samples. | ||
52 | */ | ||
53 | public void appendSamples(int channel, float[] f) | ||
54 | { | ||
55 | short s; | ||
56 | for (int i=0; i<32;) | ||
57 | { | ||
58 | s = clip(f[i++]); | ||
59 | append(channel, s); | ||
60 | } | ||
61 | } | ||
62 | |||
63 | /** | ||
64 | * Clip Sample to 16 Bits | ||
65 | */ | ||
66 | private final short clip(float sample) | ||
67 | { | ||
68 | return ((sample > 32767.0f) ? 32767 : | ||
69 | ((sample < -32768.0f) ? -32768 : | ||
70 | (short) sample)); | ||
71 | } | ||
72 | |||
73 | /** | ||
74 | * Write the samples to the file or directly to the audio hardware. | ||
75 | */ | ||
76 | public abstract void write_buffer(int val); | ||
77 | public abstract void close(); | ||
78 | |||
79 | /** | ||
80 | * Clears all data in the buffer (for seeking). | ||
81 | */ | ||
82 | public abstract void clear_buffer(); | ||
83 | |||
84 | /** | ||
85 | * Notify the buffer that the user has stopped the stream. | ||
86 | */ | ||
87 | public abstract void set_stop_flag(); | ||
88 | } | ||