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pl-nk v0.4.5
Plonk|Plink|Plank are a set of cross-platform C/C++ frameworks for audio software development
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00001 /* 00002 ------------------------------------------------------------------------------- 00003 This file is part of the Plink, Plonk, Plank libraries 00004 by Martin Robinson 00005 00006 http://code.google.com/p/pl-nk/ 00007 00008 Copyright University of the West of England, Bristol 2011-14 00009 All rights reserved. 00010 00011 Redistribution and use in source and binary forms, with or without 00012 modification, are permitted provided that the following conditions are met: 00013 00014 * Redistributions of source code must retain the above copyright 00015 notice, this list of conditions and the following disclaimer. 00016 * Redistributions in binary form must reproduce the above copyright 00017 notice, this list of conditions and the following disclaimer in the 00018 documentation and/or other materials provided with the distribution. 00019 * Neither the name of University of the West of England, Bristol nor 00020 the names of its contributors may be used to endorse or promote products 00021 derived from this software without specific prior written permission. 00022 00023 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 00024 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 00025 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 00026 DISCLAIMED. IN NO EVENT SHALL UNIVERSITY OF THE WEST OF ENGLAND, BRISTOL BE 00027 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 00028 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 00029 GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 00030 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 00031 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 00032 OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00033 00034 This software makes use of third party libraries. For more information see: 00035 doc/license.txt included in the distribution. 00036 ------------------------------------------------------------------------------- 00037 */ 00038 00039 #ifndef PLONK_CONSTANTCHANNEL_H 00040 #define PLONK_CONSTANTCHANNEL_H 00041 00042 #include "../channel/plonk_ChannelInternalCore.h" 00043 #include "../plonk_GraphForwardDeclarations.h" 00044 #include "../utility/plonk_BlockSize.h" 00045 00046 00048 template<class SampleType> 00049 class ConstantChannelInternal 00050 : public ChannelInternal<SampleType, ChannelInternalCore::Data> 00051 { 00052 public: 00053 typedef ChannelInternalCore::Data Data; 00054 typedef NumericalArray<SampleType> Buffer; 00055 typedef ChannelInternal<SampleType,Data> Internal; 00056 typedef ChannelInternalBase<SampleType> InternalBase; 00057 typedef InputDictionary Inputs; 00058 00059 enum Outputs { Output, NumOutputs }; 00060 00061 template<class ValueType> 00062 ConstantChannelInternal (ValueType const& valueInit) throw() 00063 : Internal (Inputs(), 00064 Data::create(-1.0), 00065 BlockSize::getBlockSize1(), 00066 SampleRate::getSampleRate0()), 00067 value ((SampleType)valueInit) 00068 { 00069 } 00070 00071 Text getName() const throw() 00072 { 00073 return "Constant"; 00074 } 00075 00076 IntArray getInputKeys() const throw() 00077 { 00078 const IntArray keys (IOKey::Constant); 00079 return keys; 00080 } 00081 00082 bool isConstant() const throw() { return true; } 00083 00084 InternalBase* getChannel (const int /*index*/) throw() 00085 { 00086 return this; 00087 } 00088 00089 void initChannel (const int /*channel*/) throw() 00090 { 00091 // only ever one channel from here upwards 00092 this->initValue (value); 00093 } 00094 00095 void process (ProcessInfo& /*info*/, const int /*channel*/) throw() 00096 { 00097 SampleType* const outputSamples = this->getOutputSamples(); 00098 const int outputBufferLength = this->getOutputBuffer().length(); 00099 00100 if (outputBufferLength == 1) 00101 outputSamples[0] = value; 00102 else 00103 NumericalArrayFiller<SampleType>::fill (outputSamples, value, (UnsignedLong)outputBufferLength); 00104 } 00105 00106 private: 00107 const SampleType value; 00108 }; 00109 00110 //------------------------------------------------------------------------------ 00111 00113 template<class SampleType> 00114 class NullChannelInternal : public ConstantChannelInternal<SampleType> 00115 { 00116 public: 00117 typedef NullChannelInternal<SampleType> Internal; 00118 typedef ConstantChannelInternal<SampleType> Base; 00119 00120 NullChannelInternal () throw() 00121 : Base (SampleType (0)) 00122 { 00123 } 00124 00125 bool isNull() const throw() { return true; } 00126 00127 Text getName() const throw() 00128 { 00129 return "Null (0)"; 00130 } 00131 }; 00132 00133 00134 00135 #endif // PLONK_CONSTANTCHANNEL_H