e1lama/stk
1
0
Fork 0
mirror of https://github.com/thestk/stk synced 2026-01-15 22:11:52 +00:00
Code Issues Packages Projects Releases Wiki Activity

Version 4.4.3

Browse Source
This commit is contained in:
Gary Scavone
2013-09-29 23:21:29 +02:00
committed by Stephen Sinclair
parent baca57040b
commit 0aec39260a
223 changed files with 26190 additions and 11130 deletions
Download Patch File Download Diff File Expand all files Collapse all files

45
src/JCRev.cpp
View File

@@ -2,14 +2,20 @@
/*! \class JCRev
\brief John Chowning's reverberator class.
This class takes a monophonic input signal and produces a stereo
output signal. It is derived from the CLM JCRev function, which
is based on the use of networks of simple allpass and comb delay
filters. This class implements three series allpass units,
followed by four parallel comb filters, and two decorrelation
delay lines in parallel at the output.
This class takes a monophonic input signal and
produces a stereo output signal. It is derived
from the CLM JCRev function, which is based on
the use of networks of simple allpass and comb
delay filters. This class implements three
series allpass units, followed by four parallel
comb filters, and two decorrelation delay lines
in parallel at the output.
by Perry R. Cook and Gary P. Scavone, 1995 - 2010.
Although not in the original JC reverberator,
one-pole lowpass filters have been added inside
the feedback comb filters.
by Perry R. Cook and Gary P. Scavone, 1995-2011.
*/
/***************************************************/
@@ -20,10 +26,16 @@ namespace stk {
JCRev :: JCRev( StkFloat T60 )
{
if ( T60 <= 0.0 ) {
oStream_ << "JCRev::JCRev: argument (" << T60 << ") must be positive!";
handleError( StkError::FUNCTION_ARGUMENT );
}
lastFrame_.resize( 1, 2, 0.0 ); // resize lastFrame_ for stereo output
// Delay lengths for 44100 Hz sample rate.
int lengths[9] = {1777, 1847, 1993, 2137, 389, 127, 43, 211, 179};
// {1116, 1188, 1356, 1277, 1422, 1491, 1617, 1557} // FreeVerb comb delays
int lengths[9] = {1116, 1356, 1422, 1617, 225, 341, 441, 211, 179};
double scaler = Stk::sampleRate() / 44100.0;
int delay, i;
@@ -44,6 +56,7 @@ JCRev :: JCRev( StkFloat T60 )
for ( i=0; i<4; i++ ) {
combDelays_[i].setMaximumDelay( lengths[i] );
combDelays_[i].setDelay( lengths[i] );
combFilters_[i].setPole( 0.2 );
}
this->setT60( T60 );
@@ -73,6 +86,11 @@ void JCRev :: clear()
void JCRev :: setT60( StkFloat T60 )
{
if ( T60 <= 0.0 ) {
oStream_ << "JCRev::setT60: argument (" << T60 << ") must be positive!";
handleError( StkError::WARNING ); return;
}
for ( int i=0; i<4; i++ )
combCoefficient_[i] = pow(10.0, (-3.0 * combDelays_[i].getDelay() / (T60 * Stk::sampleRate())));
}
@@ -81,7 +99,7 @@ StkFrames& JCRev :: tick( StkFrames& frames, unsigned int channel )
{
#if defined(_STK_DEBUG_)
if ( channel >= frames.channels() - 1 ) {
errorString_ << "JCRev::tick(): channel and StkFrames arguments are incompatible!";
oStream_ << "JCRev::tick(): channel and StkFrames arguments are incompatible!";
handleError( StkError::FUNCTION_ARGUMENT );
}
#endif
@@ -90,8 +108,7 @@ StkFrames& JCRev :: tick( StkFrames& frames, unsigned int channel )
unsigned int hop = frames.channels();
for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
*samples = tick( *samples );
*samples++;
*samples = lastFrame_[1];
*(samples+1) = lastFrame_[1];
}
return frames;
@@ -101,7 +118,7 @@ StkFrames& JCRev :: tick( StkFrames& iFrames, StkFrames& oFrames, unsigned int i
{
#if defined(_STK_DEBUG_)
if ( iChannel >= iFrames.channels() || oChannel >= oFrames.channels() - 1 ) {
errorString_ << "JCRev::tick(): channel and StkFrames arguments are incompatible!";
oStream_ << "JCRev::tick(): channel and StkFrames arguments are incompatible!";
handleError( StkError::FUNCTION_ARGUMENT );
}
#endif
@@ -110,8 +127,8 @@ StkFrames& JCRev :: tick( StkFrames& iFrames, StkFrames& oFrames, unsigned int i
StkFloat *oSamples = &oFrames[oChannel];
unsigned int iHop = iFrames.channels(), oHop = oFrames.channels();
for ( unsigned int i=0; i<iFrames.frames(); i++, iSamples += iHop, oSamples += oHop ) {
*oSamples++ = tick( *iSamples );
*oSamples = lastFrame_[1];
*oSamples = tick( *iSamples );
*(oSamples+1) = lastFrame_[1];
}
return iFrames;