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