c@225: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
c@225: 
c@225: /*
c@225:     QM DSP Library
c@225: 
c@225:     Centre for Digital Music, Queen Mary, University of London.
c@225:     This file copyright 2005-2006 Christian Landone.
c@225:     All rights reserved.
c@225: */
c@225: 
c@225: #include "Framer.h"
c@225: #include <math.h>
c@225: 
c@225: //////////////////////////////////////////////////////////////////////
c@225: // Construction/Destruction
c@225: //////////////////////////////////////////////////////////////////////
c@225: 
c@225: Framer::Framer()
c@225: {
c@225:     m_dataFrame = NULL;
c@225:     m_strideFrame = NULL;
c@225: }
c@225: 
c@225: Framer::~Framer()
c@225: {
c@225:     if( m_dataFrame != NULL )
c@225: 	delete [] m_dataFrame;
c@225: 
c@225:     if( m_strideFrame != NULL )
c@225: 	delete [] m_strideFrame;
c@225: }
c@225: 
c@225: void Framer::configure( unsigned int frameLength, unsigned int hop )
c@225: {
c@225:     m_frameLength = frameLength;
c@225:     m_stepSize = hop;
c@225: 
c@225:     resetCounters();
c@225: 
c@225:     if( m_dataFrame != NULL )
c@225:     {
c@225: 	delete [] m_dataFrame;	
c@225: 	m_dataFrame = NULL;
c@225:     }
c@225:     m_dataFrame = new double[ m_frameLength ];
c@225: 
c@225:     if( m_strideFrame != NULL )
c@225:     {
c@225: 	delete [] m_strideFrame;	
c@225: 	m_strideFrame = NULL;
c@225:     }
c@225:     m_strideFrame = new double[ m_stepSize ];
c@225: }
c@225: 
c@225: void Framer::getFrame(double *dst)
c@225: {
c@225: 
c@225:     if( (m_ulSrcIndex + ( m_frameLength) ) < m_ulSampleLen )
c@225:     {
c@225: 	for( unsigned int u = 0; u < m_frameLength; u++)
c@225: 	{
c@225: 	    dst[ u ] = m_srcBuffer[ m_ulSrcIndex++ ]; 
c@225: 	}	
c@225: 	m_ulSrcIndex -= ( m_frameLength - m_stepSize );
c@225:     }
c@225:     else
c@225:     {
c@225: 	unsigned int rem = (m_ulSampleLen - m_ulSrcIndex );
c@225: 	unsigned int zero = m_frameLength - rem;
c@225: 
c@225: 	for( unsigned int u = 0; u < rem; u++ )
c@225: 	{
c@225: 	    dst[ u ] = m_srcBuffer[ m_ulSrcIndex++ ];
c@225: 	}
c@225: 		
c@225: 	for( unsigned int u = 0; u < zero; u++ )
c@225: 	{
c@225: 	    dst[ rem + u ] = 0;
c@225: 	}
c@225: 
c@225: 	m_ulSrcIndex -= (( rem - m_stepSize ) );
c@225:     }
c@225: 
c@225:     m_framesRead++;
c@225: }
c@225: 
c@225: void Framer::resetCounters()
c@225: {
c@225:     m_framesRead = 0;
c@225:     m_ulSrcIndex = 0;
c@225: }
c@225: 
c@225: unsigned int Framer::getMaxNoFrames()
c@225: {
c@225:     return m_maxFrames;
c@225: }
c@225: 
c@225: void Framer::setSource(double *src, unsigned int length)
c@225: {
c@225:     m_srcBuffer = src;
c@225:     m_ulSampleLen = length;
c@225: 
c@225:     m_maxFrames = (unsigned int)ceil( (double)m_ulSampleLen/(double)m_stepSize ) ;
c@225: }