CLAM-Development
1.1
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00001 /* 00002 * Copyright (c) 2001-2004 MUSIC TECHNOLOGY GROUP (MTG) 00003 * UNIVERSITAT POMPEU FABRA 00004 * 00005 * 00006 * This program is free software; you can redistribute it and/or modify 00007 * it under the terms of the GNU General Public License as published by 00008 * the Free Software Foundation; either version 2 of the License, or 00009 * (at your option) any later version. 00010 * 00011 * This program is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 * GNU General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU General Public License 00017 * along with this program; if not, write to the Free Software 00018 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 00019 * 00020 */ 00021 00022 #include "EnvelopeModulator.hxx" 00023 #include "CLAM_Math.hxx" 00024 00025 00026 namespace CLAM { 00027 00028 void EnvModulatorConfig::DefaultInit() 00029 { 00030 AddAll(); 00031 UpdateData(); 00032 SetSampleRate(44100); 00033 SetFrameSize(512); 00034 SetEnvelopeCompression(true); 00035 } 00036 00037 00038 EnvelopeModulator::EnvelopeModulator(const EnvModulatorConfig& c) 00039 : InputEnvelope("Input Envelope",this), 00040 InputAudio("Input Audio",this), 00041 Output("Output Audio",this) 00042 { 00043 Configure(c); 00044 } 00045 00046 bool EnvelopeModulator::ConcreteConfigure(const ProcessingConfig& c) 00047 { 00048 CopyAsConcreteConfig(mConfig, c); 00049 00050 mDeltaX = 1000.0/((TTime)mConfig.GetSampleRate()); 00051 00052 mCompress = mConfig.GetEnvelopeCompression(); 00053 00054 InputAudio.SetSize(mConfig.GetFrameSize()); 00055 Output.SetSize(mConfig.GetFrameSize()); 00056 return true; 00057 } 00058 00059 TData EnvelopeModulator::Compress(TData x) 00060 { 00061 if (x>=0) 00062 return 1.0 - exp(-x); 00063 else 00064 return - (1.0 - exp(x)); 00065 } 00066 00067 00068 bool EnvelopeModulator::Do() 00069 { 00070 bool res = Do(InputEnvelope.GetData(), 00071 InputAudio.GetData(), 00072 Output.GetData()); 00073 InputEnvelope.Consume(); 00074 InputAudio.Consume(); 00075 Output.Produce(); 00076 return res; 00077 } 00078 00079 bool EnvelopeModulator::Do(const Envelope& env, const Audio& inp, Audio& out) 00080 { 00081 Array<TData> &inputArray = inp.GetBuffer(); 00082 Array<TData> &outputArray = out.GetBuffer(); 00083 BPFTmpl<TTime,TData> &litudeBpf = env.GetAmplitudeBPF(); 00084 TTime pos = 0.0; 00085 const int size = std::min(inp.GetSize(), out.GetSize()); 00086 if (mCompress) 00087 for (int i=0;i<size;i++) { 00088 outputArray[i]=inputArray[i]*amplitudeBpf.GetValue(pos); 00089 pos += mDeltaX; 00090 } 00091 else 00092 for (int i=0;i<size;i++) { 00093 outputArray[i]=inputArray[i]*Compress(amplitudeBpf.GetValue(pos)); 00094 pos += mDeltaX; 00095 } 00096 return true; 00097 } 00098 00099 00100 } 00101