422 lines
13 KiB
C++
Executable file
422 lines
13 KiB
C++
Executable file
/******************************************************************************\
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* Copyright (c) 2004-2009
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*
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* Author(s):
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* Volker Fischer
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*
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******************************************************************************
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option) any later
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* version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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\******************************************************************************/
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#include "util.h"
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/* Implementation *************************************************************/
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// Input level meter implementation --------------------------------------------
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void CStereoSignalLevelMeter::Update ( CVector<double>& vecdAudio )
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{
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// get the stereo vector size
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const int iStereoVecSize = vecdAudio.Size();
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// Get maximum of current block
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//
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// Speed optimization:
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// - we only make use of the positive values and ignore the negative ones
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// -> we do not need to call the fabs() function
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// - we only evaluate every third sample
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//
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// With these speed optimizations we might loose some information in
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// special cases but for the average music signals the following code
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// should give good results.
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//
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double dMaxL = 0.0;
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double dMaxR = 0.0;
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for ( int i = 0; i < iStereoVecSize; i += 6 ) // 2 * 3 = 6 -> stereo
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{
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// left channel
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if ( dMaxL < vecdAudio[i] )
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{
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dMaxL = vecdAudio[i];
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}
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// right channel
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if ( dMaxR < vecdAudio[i + 1] )
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{
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dMaxR = vecdAudio[i + 1];
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}
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}
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dCurLevelL = UpdateCurLevel ( dCurLevelL, dMaxL );
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dCurLevelR = UpdateCurLevel ( dCurLevelR, dMaxR );
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}
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double CStereoSignalLevelMeter::UpdateCurLevel ( double dCurLevel, const double& dMax )
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{
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// decrease max with time
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if ( dCurLevel >= METER_FLY_BACK )
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{
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// TODO calculate factor from sample rate
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dCurLevel *= 0.99;
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}
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else
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{
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dCurLevel = 0;
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}
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// update current level -> only use maximum
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if ( dMax > dCurLevel )
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{
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return dMax;
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}
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else
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{
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return dCurLevel;
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}
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}
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double CStereoSignalLevelMeter::CalcLogResult ( const double& dLinearLevel )
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{
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const double dNormMicLevel = dLinearLevel / _MAXSHORT;
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// logarithmic measure
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if ( dNormMicLevel > 0 )
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{
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return 20.0 * log10 ( dNormMicLevel );
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}
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else
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{
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return -100000.0; // large negative value
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}
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}
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// CRC -------------------------------------------------------------------------
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void CCRC::Reset()
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{
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/* Init state shift-register with ones. Set all registers to "1" with
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bit-wise not operation */
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iStateShiftReg = ~uint32_t ( 0 );
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}
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void CCRC::AddByte ( const uint8_t byNewInput )
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{
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for ( int i = 0; i < 8; i++ )
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{
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// shift bits in shift-register for transistion
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iStateShiftReg <<= 1;
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/* Take bit, which was shifted out of the register-size and place it
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at the beginning (LSB)
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(If condition is not satisfied, implicitely a "0" is added) */
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if ( ( iStateShiftReg & iBitOutMask) > 0 )
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{
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iStateShiftReg |= 1;
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}
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// add new data bit to the LSB
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if ( ( byNewInput & ( 1 << ( 8 - i - 1 ) ) ) > 0 )
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{
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iStateShiftReg ^= 1;
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}
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// add mask to shift-register if first bit is true
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if ( iStateShiftReg & 1 )
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{
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iStateShiftReg ^= iPoly;
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}
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}
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}
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uint32_t CCRC::GetCRC()
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{
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// return inverted shift-register (1's complement)
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iStateShiftReg = ~iStateShiftReg;
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// remove bit which where shifted out of the shift-register frame
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return iStateShiftReg & ( iBitOutMask - 1 );
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}
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/******************************************************************************\
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* Audio Reverberation *
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\******************************************************************************/
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/*
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The following code is based on "JCRev: John Chowning's reverberator class"
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by Perry R. Cook and Gary P. Scavone, 1995 - 2004
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which is in "The Synthesis ToolKit in C++ (STK)"
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http://ccrma.stanford.edu/software/stk
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Original description:
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This class is derived from the CLM JCRev function, which is based on the use
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of networks of simple allpass and comb delay filters. This class implements
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three series allpass units, followed by four parallel comb filters, and two
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decorrelation delay lines in parallel at the output.
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*/
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CAudioReverb::CAudioReverb ( const double rT60 )
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{
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int delay, i;
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// delay lengths for 44100 Hz sample rate
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int lengths[9] = { 1777, 1847, 1993, 2137, 389, 127, 43, 211, 179 };
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const double scaler = (double) SYSTEM_SAMPLE_RATE / 44100.0;
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if ( scaler != 1.0 )
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{
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for ( i = 0; i < 9; i++ )
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{
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delay = (int) floor ( scaler * lengths[i] );
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if ( ( delay & 1 ) == 0 )
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{
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delay++;
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}
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while ( !isPrime ( delay ) )
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{
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delay += 2;
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}
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lengths[i] = delay;
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}
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}
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for ( i = 0; i < 3; i++ )
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{
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allpassDelays_[i].Init ( lengths[i + 4] );
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}
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for ( i = 0; i < 4; i++ )
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{
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combDelays_[i].Init ( lengths[i] );
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}
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setT60 ( rT60 );
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allpassCoefficient_ = (double) 0.7;
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Clear();
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}
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bool CAudioReverb::isPrime ( const int number )
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{
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/*
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Returns true if argument value is prime. Taken from "class Effect" in
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"STK abstract effects parent class".
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*/
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if ( number == 2 )
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{
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return true;
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}
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if ( number & 1 )
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{
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for ( int i = 3; i < (int) sqrt ( (double) number ) + 1; i += 2 )
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{
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if ( ( number % i ) == 0 )
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{
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return false;
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}
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}
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return true; // prime
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}
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else
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{
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return false; // even
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}
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}
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void CAudioReverb::Clear()
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{
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// reset and clear all internal state
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allpassDelays_[0].Reset ( 0 );
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allpassDelays_[1].Reset ( 0 );
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allpassDelays_[2].Reset ( 0 );
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combDelays_[0].Reset ( 0 );
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combDelays_[1].Reset ( 0 );
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combDelays_[2].Reset ( 0 );
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combDelays_[3].Reset ( 0 );
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}
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void CAudioReverb::setT60 ( const double rT60 )
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{
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// set the reverberation T60 decay time
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for ( int i = 0; i < 4; i++ )
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{
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combCoefficient_[i] = pow ( (double) 10.0, (double) ( -3.0 *
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combDelays_[i].Size() / ( rT60 * SYSTEM_SAMPLE_RATE ) ) );
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}
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}
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double CAudioReverb::ProcessSample ( const double input )
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{
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// compute one output sample
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double temp, temp0, temp1, temp2;
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temp = allpassDelays_[0].Get();
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temp0 = allpassCoefficient_ * temp;
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temp0 += input;
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allpassDelays_[0].Add ( (int) temp0 );
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temp0 = - ( allpassCoefficient_ * temp0 ) + temp;
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temp = allpassDelays_[1].Get();
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temp1 = allpassCoefficient_ * temp;
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temp1 += temp0;
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allpassDelays_[1].Add ( (int) temp1 );
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temp1 = - ( allpassCoefficient_ * temp1 ) + temp;
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temp = allpassDelays_[2].Get();
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temp2 = allpassCoefficient_ * temp;
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temp2 += temp1;
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allpassDelays_[2].Add ( (int) temp2 );
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temp2 = - ( allpassCoefficient_ * temp2 ) + temp;
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const double temp3 = temp2 + ( combCoefficient_[0] * combDelays_[0].Get() );
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const double temp4 = temp2 + ( combCoefficient_[1] * combDelays_[1].Get() );
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const double temp5 = temp2 + ( combCoefficient_[2] * combDelays_[2].Get() );
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const double temp6 = temp2 + ( combCoefficient_[3] * combDelays_[3].Get() );
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combDelays_[0].Add ( (int) temp3 );
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combDelays_[1].Add ( (int) temp4 );
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combDelays_[2].Add ( (int) temp5 );
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combDelays_[3].Add ( (int) temp6 );
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return ( temp3 + temp4 + temp5 + temp6 ) * (double) 0.5;
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}
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/******************************************************************************\
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* GUI utilities *
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\******************************************************************************/
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// About dialog ----------------------------------------------------------------
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CAboutDlg::CAboutDlg ( QWidget* parent ) : QDialog ( parent )
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{
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setupUi ( this );
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// set the text for the about dialog html text control
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TextViewCredits->setText (
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"<p>" // general description of llcon software
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"<big><b>llcon</b> " + tr("Client/Server communication tool to enable "
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"musician to play together through a conventional broadband internet "
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"connection (like DSL).") + "</big>"
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"</p><br>"
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"<p><font face=\"courier\">" // GPL header text
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"This program is free software; you can redistribute it and/or modify "
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"it under the terms of the GNU General Public License as published by "
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"the Free Software Foundation; either version 2 of the License, or "
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"(at your option) any later version.<br>This program is distributed in "
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"the hope that it will be useful, but WITHOUT ANY WARRANTY; without "
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"even the implied warranty of MERCHANTABILITY or FITNESS FOR A "
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"PARTICULAR PURPOSE. See the GNU General Public License for more "
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"details.<br>You should have received a copy of the GNU General Public "
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"License along with his program; if not, write to the Free Software "
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"Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 "
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"USA"
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"</font></p><br>"
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"<p>" // libraries used by this compilation of llcon
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"<b>" + tr("llcon uses the following libraries or code snippets:") +
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"</b></p>"
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"<ul>"
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"<li>Qt cross-platform application framework: <i>http://trolltech.com</li>"
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"<li>Audio reverberation code: by Perry R. Cook and Gary P. Scavone, "
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"1995 - 2004 (taken from \"The Synthesis ToolKit in C++ (STK)\")</li>"
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"<li>ADPCM coders by Erik de Castro Lopo</li>"
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"<li>Parts from Dream DRM Receiver by Volker Fischer and Alexander "
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"Kurpiers: <i>http://drm.sf.net</li>"
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"</ul>"
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"</center><br>");
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// set version number in about dialog
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TextLabelVersion->setText ( GetVersionAndNameStr() );
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}
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QString CAboutDlg::GetVersionAndNameStr ( const bool bWithHtml )
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{
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QString strVersionText = "";
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// name, short description and GPL hint
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if ( bWithHtml )
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{
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strVersionText += "<center><b>";
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}
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strVersionText += tr ( "llcon, Version " ) + VERSION;
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if ( bWithHtml )
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{
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strVersionText += "</b><br>";
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}
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else
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{
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strVersionText += "\n";
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}
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strVersionText += tr ( "llcon, Low-Latency (internet) CONnection" );
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if ( bWithHtml )
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{
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strVersionText += "<br>";
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}
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else
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{
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strVersionText += "\n";
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}
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strVersionText += tr ( "Under the GNU General Public License (GPL)" );
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if ( bWithHtml )
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{
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strVersionText += "</center>";
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}
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return strVersionText;
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}
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// Help menu -------------------------------------------------------------------
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CLlconHelpMenu::CLlconHelpMenu ( QWidget* parent ) : QMenu ( "&?", parent )
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{
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// standard help menu consists of about and what's this help
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addAction ( tr ( "What's &This" ), this,
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SLOT ( OnHelpWhatsThis() ), QKeySequence ( Qt::SHIFT + Qt::Key_F1 ) );
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addSeparator();
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addAction ( tr ( "&About..." ), this, SLOT ( OnHelpAbout() ) );
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}
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/******************************************************************************\
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* Global functions implementation *
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\******************************************************************************/
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void DebugError ( const QString& pchErDescr, const QString& pchPar1Descr,
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const double dPar1, const QString& pchPar2Descr,
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const double dPar2 )
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{
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QFile File ( "DebugError.dat" );
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if ( File.open ( QIODevice::Append ) )
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{
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// append new line in logging file
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QTextStream out ( &File );
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out << pchErDescr << " ### " <<
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pchPar1Descr << ": " << QString().setNum ( dPar1, 'f', 2 ) <<
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" ### " <<
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pchPar2Descr << ": " << QString().setNum ( dPar2, 'f', 2 ) <<
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endl;
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File.close();
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}
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printf ( "\nDebug error! For more information see test/DebugError.dat\n" );
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exit ( 1 );
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}
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