libsidplayfp 1.0.3
Resampler.h
00001 /*
00002  * This file is part of libsidplayfp, a SID player engine.
00003  *
00004  * Copyright 2011-2013 Leandro Nini <drfiemost@users.sourceforge.net>
00005  * Copyright 2007-2010 Antti Lankila
00006  *
00007  * This program is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 2 of the License, or
00010  * (at your option) any later version.
00011  *
00012  * This program is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with this program; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
00020  */
00021 
00022 #ifndef RESAMPLER_H
00023 #define RESAMPLER_H
00024 
00025 namespace reSIDfp
00026 {
00027 
00034 class Resampler
00035 {
00036 protected:
00037     virtual int output() const = 0;
00038 
00039     Resampler() {}
00040 
00041 public:
00042     virtual ~Resampler() {}
00043 
00050     virtual bool input(int sample) = 0;
00051 
00057     short getOutput() const
00058     {
00059         const int value = output();
00060 
00061         // Clip signed integer value into the -32768,32767 range.
00062 #if 1
00063         // This requires two's complement integer
00064         return ((value + 0x8000) & ~0xFFFF) ? (value >> 31) ^ 0x7FFF : value;
00065 #else
00066         return (value < -32768) ? -32768 : (value > 32767) ? 32767 : value;
00067 #endif
00068     }
00069 
00070     virtual void reset() = 0;
00071 };
00072 
00073 } // namespace reSIDfp
00074 
00075 #endif