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add queen mary DSP library

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git-svn-id: svn://localhost/ardour2/branches/3.0@9029 d708f5d6-7413-0410-9779-e7cbd77b26cf
This commit is contained in:
Paul Davis 2011-03-02 12:37:39 +00:00
parent fa41cfef58
commit 3deba1921b
85 changed files with 69852 additions and 0 deletions
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109
libs/qm-dsp/dsp/signalconditioning/Framer.cpp Normal file
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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
/*
QM DSP Library
Centre for Digital Music, Queen Mary, University of London.
This file 2005-2006 Christian Landone.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version. See the file
COPYING included with this distribution for more information.
*/
#include "Framer.h"
#include <math.h>
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
Framer::Framer()
{
m_dataFrame = NULL;
m_strideFrame = NULL;
}
Framer::~Framer()
{
if( m_dataFrame != NULL )
delete [] m_dataFrame;
if( m_strideFrame != NULL )
delete [] m_strideFrame;
}
void Framer::configure( unsigned int frameLength, unsigned int hop )
{
m_frameLength = frameLength;
m_stepSize = hop;
resetCounters();
if( m_dataFrame != NULL )
{
delete [] m_dataFrame;
m_dataFrame = NULL;
}
m_dataFrame = new double[ m_frameLength ];
if( m_strideFrame != NULL )
{
delete [] m_strideFrame;
m_strideFrame = NULL;
}
m_strideFrame = new double[ m_stepSize ];
}
void Framer::getFrame(double *dst)
{
if( (m_ulSrcIndex + ( m_frameLength) ) < m_ulSampleLen )
{
for( unsigned int u = 0; u < m_frameLength; u++)
{
dst[ u ] = m_srcBuffer[ m_ulSrcIndex++ ];
}
m_ulSrcIndex -= ( m_frameLength - m_stepSize );
}
else
{
unsigned int rem = (m_ulSampleLen - m_ulSrcIndex );
unsigned int zero = m_frameLength - rem;
for( unsigned int u = 0; u < rem; u++ )
{
dst[ u ] = m_srcBuffer[ m_ulSrcIndex++ ];
}
for( unsigned int u = 0; u < zero; u++ )
{
dst[ rem + u ] = 0;
}
m_ulSrcIndex -= (( rem - m_stepSize ) );
}
m_framesRead++;
}
void Framer::resetCounters()
{
m_framesRead = 0;
m_ulSrcIndex = 0;
}
unsigned int Framer::getMaxNoFrames()
{
return m_maxFrames;
}
void Framer::setSource(double *src, unsigned int length)
{
m_srcBuffer = src;
m_ulSampleLen = length;
m_maxFrames = (unsigned int)ceil( (double)m_ulSampleLen/(double)m_stepSize ) ;
}