libsidplayfp  1.2.2
Resampler.h
1 /*
2  * This file is part of libsidplayfp, a SID player engine.
3  *
4  * Copyright 2011-2013 Leandro Nini <drfiemost@users.sourceforge.net>
5  * Copyright 2007-2010 Antti Lankila
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20  */
21 
22 #ifndef RESAMPLER_H
23 #define RESAMPLER_H
24 
25 namespace reSIDfp
26 {
27 
34 class Resampler
35 {
36 protected:
37  virtual int output() const = 0;
38 
39  Resampler() {}
40 
41 public:
42  virtual ~Resampler() {}
43 
50  virtual bool input(int sample) = 0;
51 
57  short getOutput() const
58  {
59  const int value = output();
60 
61  // Clip signed integer value into the -32768,32767 range.
62 #if 1
63  // This requires two's complement integer
64  return ((value + 0x8000) & ~0xFFFF) ? (value >> 31) ^ 0x7FFF : value;
65 #else
66  return (value < -32768) ? -32768 : (value > 32767) ? 32767 : value;
67 #endif
68  }
69 
70  virtual void reset() = 0;
71 };
72 
73 } // namespace reSIDfp
74 
75 #endif
short getOutput() const
Definition: Resampler.h:57
Definition: Resampler.h:34
virtual bool input(int sample)=0