641 lines
16 KiB
C++
641 lines
16 KiB
C++
/*
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WDL - resample.cpp
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Copyright (C) 2010 and later Cockos Incorporated
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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You may also distribute this software under the LGPL v2 or later.
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*/
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#include "resample.h"
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#include <math.h>
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#include "denormal.h"
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#ifndef PI
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#define PI 3.1415926535897932384626433832795
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#endif
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class WDL_Resampler::WDL_Resampler_IIRFilter
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{
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public:
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WDL_Resampler_IIRFilter()
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{
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m_fpos=-1;
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Reset();
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}
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~WDL_Resampler_IIRFilter()
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{
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}
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void Reset()
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{
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memset(m_hist,0,sizeof(m_hist));
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}
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void setParms(double fpos, double Q)
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{
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if (fabs(fpos-m_fpos)<0.000001) return;
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m_fpos=fpos;
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double pos = fpos * PI;
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double cpos=cos(pos);
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double spos=sin(pos);
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double alpha=spos/(2.0*Q);
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double sc=1.0/( 1 + alpha);
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m_b1 = (1-cpos) * sc;
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m_b2 = m_b0 = m_b1*0.5;
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m_a1 = -2 * cpos * sc;
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m_a2 = (1-alpha)*sc;
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}
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void Apply(WDL_ResampleSample *in1, WDL_ResampleSample *out1, int ns, int span, int w)
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{
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double b0=m_b0,b1=m_b1,b2=m_b2,a1=m_a1,a2=m_a2;
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double *hist=m_hist[w];
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while (ns--)
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{
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double in=*in1;
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in1+=span;
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double out = (double) ( in*b0 + hist[0]*b1 + hist[1]*b2 - hist[2]*a1 - hist[3]*a2);
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hist[1]=hist[0]; hist[0]=in;
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hist[3]=hist[2]; *out1 = hist[2]=denormal_filter_double(out);
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out1+=span;
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}
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}
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private:
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double m_fpos;
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double m_a1,m_a2;
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double m_b0,m_b1,m_b2;
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double m_hist[WDL_RESAMPLE_MAX_FILTERS*WDL_RESAMPLE_MAX_NCH][4];
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};
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void inline WDL_Resampler::SincSample(WDL_ResampleSample *outptr, const WDL_ResampleSample *inptr, double fracpos, int nch, const WDL_SincFilterSample *filter, int filtsz)
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{
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const int oversize=m_lp_oversize;
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fracpos *= oversize;
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const int ifpos=(int)fracpos;
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filter += (oversize-ifpos) * filtsz;
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fracpos -= ifpos;
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int x;
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for (x = 0; x < nch; x ++)
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{
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double sum=0.0,sum2=0.0;
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const WDL_SincFilterSample *fptr2=filter;
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const WDL_SincFilterSample *fptr=fptr2 - filtsz;
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const WDL_ResampleSample *iptr=inptr+x;
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int i=filtsz/2;
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while (i--)
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{
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sum += fptr[0]*iptr[0];
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sum2 += fptr2[0]*iptr[0];
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sum += fptr[1]*iptr[nch];
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sum2 += fptr2[1]*iptr[nch];
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iptr+=nch*2;
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fptr+=2;
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fptr2+=2;
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}
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outptr[x]=sum*fracpos + sum2*(1.0-fracpos);
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}
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}
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void inline WDL_Resampler::SincSample1(WDL_ResampleSample *outptr, const WDL_ResampleSample *inptr, double fracpos, const WDL_SincFilterSample *filter, int filtsz)
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{
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const int oversize=m_lp_oversize;
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fracpos *= oversize;
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const int ifpos=(int)fracpos;
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fracpos -= ifpos;
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double sum=0.0,sum2=0.0;
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const WDL_SincFilterSample *fptr2=filter + (oversize-ifpos) * filtsz;
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const WDL_SincFilterSample *fptr=fptr2 - filtsz;
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const WDL_ResampleSample *iptr=inptr;
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int i=filtsz/2;
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while (i--)
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{
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sum += fptr[0]*iptr[0];
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sum2 += fptr2[0]*iptr[0];
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sum += fptr[1]*iptr[1];
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sum2 += fptr2[1]*iptr[1];
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iptr+=2;
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fptr+=2;
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fptr2+=2;
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}
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outptr[0]=sum*fracpos+sum2*(1.0-fracpos);
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}
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void inline WDL_Resampler::SincSample2(WDL_ResampleSample *outptr, const WDL_ResampleSample *inptr, double fracpos, const WDL_SincFilterSample *filter, int filtsz)
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{
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const int oversize=m_lp_oversize;
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fracpos *= oversize;
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const int ifpos=(int)fracpos;
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fracpos -= ifpos;
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const WDL_SincFilterSample *fptr2=filter + (oversize-ifpos) * filtsz;
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const WDL_SincFilterSample *fptr=fptr2 - filtsz;
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double sum=0.0;
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double sum2=0.0;
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double sumb=0.0;
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double sum2b=0.0;
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const WDL_ResampleSample *iptr=inptr;
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int i=filtsz/2;
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while (i--)
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{
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sum += fptr[0]*iptr[0];
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sum2 += fptr[0]*iptr[1];
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sumb += fptr2[0]*iptr[0];
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sum2b += fptr2[0]*iptr[1];
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sum += fptr[1]*iptr[2];
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sum2 += fptr[1]*iptr[3];
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sumb += fptr2[1]*iptr[2];
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sum2b += fptr2[1]*iptr[3];
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iptr+=4;
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fptr+=2;
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fptr2+=2;
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}
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outptr[0]=sum*fracpos + sumb*(1.0-fracpos);
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outptr[1]=sum2*fracpos + sum2b*(1.0-fracpos);
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}
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WDL_Resampler::WDL_Resampler(int initialinputbuffersize)
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{
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m_filterq=0.707f;
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m_filterpos=0.693f; // .792 ?
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m_sincoversize=0;
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m_lp_oversize=1;
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m_sincsize=0;
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m_filtercnt=1;
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m_interp=true;
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m_feedmode=false;
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m_filter_coeffs_size=0;
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m_sratein=44100.0;
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m_srateout=44100.0;
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m_ratio=1.0;
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m_filter_ratio=-1.0;
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m_iirfilter=0;
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if (initialinputbuffersize>0)
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m_rsinbuf.Resize(initialinputbuffersize);
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Reset();
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}
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WDL_Resampler::~WDL_Resampler()
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{
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delete m_iirfilter;
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}
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void WDL_Resampler::Reset(double fracpos)
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{
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m_last_requested=0;
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m_filtlatency=0;
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m_fracpos=fracpos;
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m_samples_in_rsinbuf=0;
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if (m_iirfilter) m_iirfilter->Reset();
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}
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void WDL_Resampler::SetMode(bool interp, int filtercnt, bool sinc, int sinc_size, int sinc_interpsize)
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{
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m_sincsize = sinc && sinc_size>= 4 ? sinc_size > 8192 ? 8192 : (sinc_size&~1) : 0;
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m_sincoversize = m_sincsize ? (sinc_interpsize<= 1 ? 1 : sinc_interpsize>=8192 ? 8192 : sinc_interpsize) : 1;
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m_filtercnt = m_sincsize ? 0 : (filtercnt<=0?0 : filtercnt >= WDL_RESAMPLE_MAX_FILTERS ? WDL_RESAMPLE_MAX_FILTERS : filtercnt);
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m_interp=interp && !m_sincsize;
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// char buf[512];
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// sprintf(buf,"setting interp=%d, filtercnt=%d, sinc=%d,%d\n",m_interp,m_filtercnt,m_sincsize,m_sincoversize);
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// OutputDebugString(buf);
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if (!m_sincsize)
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{
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m_filter_coeffs.Resize(0);
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m_filter_coeffs_size=0;
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}
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if (!m_filtercnt)
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{
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delete m_iirfilter;
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m_iirfilter=0;
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}
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}
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void WDL_Resampler::SetRates(double rate_in, double rate_out)
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{
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if (rate_in<1.0) rate_in=1.0;
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if (rate_out<1.0) rate_out=1.0;
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if (rate_in != m_sratein || rate_out != m_srateout)
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{
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m_sratein=rate_in;
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m_srateout=rate_out;
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m_ratio=m_sratein / m_srateout;
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}
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}
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void WDL_Resampler::BuildLowPass(double filtpos) // only called in sinc modes
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{
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const int wantsize=m_sincsize;
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const int wantinterp=m_sincoversize;
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if (m_filter_ratio!=filtpos ||
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m_filter_coeffs_size != wantsize ||
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m_lp_oversize != wantinterp)
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{
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m_lp_oversize = wantinterp;
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m_filter_ratio=filtpos;
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// build lowpass filter
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const int allocsize = wantsize*(m_lp_oversize+1);
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WDL_SincFilterSample *cfout=m_filter_coeffs.Resize(allocsize);
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if (m_filter_coeffs.GetSize()==allocsize)
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{
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m_filter_coeffs_size=wantsize;
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const double dwindowpos = 2.0 * PI/(double)wantsize;
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const double dsincpos = PI * filtpos; // filtpos is outrate/inrate, i.e. 0.5 is going to half rate
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const int hwantsize=wantsize/2;
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double filtpower=0.0;
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WDL_SincFilterSample *ptrout = cfout;
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int slice;
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for (slice=0;slice<=wantinterp;slice++)
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{
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const double frac = slice / (double)wantinterp;
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const int center_x = slice == 0 ? hwantsize : slice == wantinterp ? hwantsize-1 : -1;
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int x;
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for (x=0;x<wantsize;x++)
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{
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if (x==center_x)
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{
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// we know this will be 1.0
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*ptrout++ = 1.0;
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}
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else
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{
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const double xfrac = frac + x;
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const double windowpos = dwindowpos * xfrac;
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const double sincpos = dsincpos * (xfrac - hwantsize);
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// blackman-harris * sinc
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const double val = (0.35875 - 0.48829 * cos(windowpos) + 0.14128 * cos(2*windowpos) - 0.01168 * cos(3*windowpos)) * sin(sincpos) / sincpos;
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if (slice<wantinterp) filtpower+=val;
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*ptrout++ = (WDL_SincFilterSample)val;
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}
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}
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}
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filtpower = wantinterp/(filtpower+1.0);
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int x;
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for (x = 0; x < allocsize; x ++)
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{
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cfout[x] = (WDL_SincFilterSample) (cfout[x]*filtpower);
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}
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}
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else m_filter_coeffs_size=0;
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}
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}
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double WDL_Resampler::GetCurrentLatency()
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{
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double v=((double)m_samples_in_rsinbuf-m_filtlatency)/m_sratein;
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if (v<0.0)v=0.0;
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return v;
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}
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int WDL_Resampler::ResamplePrepare(int out_samples, int nch, WDL_ResampleSample **inbuffer)
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{
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if (nch > WDL_RESAMPLE_MAX_NCH || nch < 1) return 0;
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int fsize=0;
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if (m_sincsize>1) fsize = m_sincsize;
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int hfs=fsize/2;
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if (hfs>1 && m_samples_in_rsinbuf<hfs-1)
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{
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m_filtlatency+=hfs-1 - m_samples_in_rsinbuf;
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m_samples_in_rsinbuf=hfs-1;
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if (m_samples_in_rsinbuf>0)
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{
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WDL_ResampleSample *p = m_rsinbuf.Resize(m_samples_in_rsinbuf*nch,false);
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memset(p,0,sizeof(WDL_ResampleSample)*m_rsinbuf.GetSize());
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}
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}
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int sreq = 0;
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if (!m_feedmode) sreq = (int)(m_ratio * out_samples) + 4 + fsize - m_samples_in_rsinbuf;
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else sreq = out_samples;
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if (sreq<0)sreq=0;
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again:
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m_rsinbuf.Resize((m_samples_in_rsinbuf+sreq)*nch,false);
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int sz = m_rsinbuf.GetSize()/(nch?nch:1) - m_samples_in_rsinbuf;
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if (sz!=sreq)
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{
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if (sreq>4 && !sz)
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{
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sreq/=2;
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goto again; // try again with half the size
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}
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// todo: notify of error?
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sreq=sz;
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}
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*inbuffer = m_rsinbuf.Get() + m_samples_in_rsinbuf*nch;
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m_last_requested=sreq;
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return sreq;
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}
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int WDL_Resampler::ResampleOut(WDL_ResampleSample *out, int nsamples_in, int nsamples_out, int nch)
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{
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if (nch > WDL_RESAMPLE_MAX_NCH || nch < 1) return 0;
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if (m_filtercnt>0)
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{
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if (m_ratio > 1.0 && nsamples_in > 0) // filter input
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{
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if (!m_iirfilter) m_iirfilter = new WDL_Resampler_IIRFilter;
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int n=m_filtercnt;
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m_iirfilter->setParms((1.0/m_ratio)*m_filterpos,m_filterq);
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WDL_ResampleSample *buf=(WDL_ResampleSample *)m_rsinbuf.Get() + m_samples_in_rsinbuf*nch;
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int a,x;
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int offs=0;
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for (x=0; x < nch; x ++)
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for (a = 0; a < n; a ++)
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m_iirfilter->Apply(buf+x,buf+x,nsamples_in,nch,offs++);
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}
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}
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// prevent the caller from corrupting the internal state
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m_samples_in_rsinbuf += nsamples_in < m_last_requested ? nsamples_in : m_last_requested;
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int rsinbuf_availtemp = m_samples_in_rsinbuf;
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if (nsamples_in < m_last_requested) // flush out to ensure we can deliver
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{
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int fsize=(m_last_requested-nsamples_in)*2 + m_sincsize*2;
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int alloc_size=(m_samples_in_rsinbuf+fsize)*nch;
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WDL_ResampleSample *zb=m_rsinbuf.Resize(alloc_size,false);
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if (m_rsinbuf.GetSize()==alloc_size)
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{
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memset(zb+m_samples_in_rsinbuf*nch,0,fsize*nch*sizeof(WDL_ResampleSample));
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rsinbuf_availtemp = m_samples_in_rsinbuf+fsize;
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}
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}
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int ret=0;
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double srcpos=m_fracpos;
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double drspos = m_ratio;
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WDL_ResampleSample *localin = m_rsinbuf.Get();
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WDL_ResampleSample *outptr=out;
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int ns=nsamples_out;
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int outlatadj=0;
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if (m_sincsize) // sinc interpolating
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{
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if (m_ratio > 1.0) BuildLowPass(1.0 / (m_ratio*1.03));
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else BuildLowPass(1.0);
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int filtsz=m_filter_coeffs_size;
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int filtlen = rsinbuf_availtemp - filtsz;
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outlatadj=filtsz/2-1;
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WDL_SincFilterSample *filter=m_filter_coeffs.Get();
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if (nch == 1)
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{
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while (ns--)
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{
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int ipos = (int)srcpos;
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if (ipos >= filtlen-1) break; // quit decoding, not enough input samples
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SincSample1(outptr,localin + ipos,srcpos-ipos,filter,filtsz);
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outptr ++;
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srcpos+=drspos;
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ret++;
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}
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}
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else if (nch==2)
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{
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while (ns--)
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{
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int ipos = (int)srcpos;
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if (ipos >= filtlen-1) break; // quit decoding, not enough input samples
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SincSample2(outptr,localin + ipos*2,srcpos-ipos,filter,filtsz);
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outptr+=2;
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srcpos+=drspos;
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ret++;
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}
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}
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else
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{
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while (ns--)
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{
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int ipos = (int)srcpos;
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if (ipos >= filtlen-1) break; // quit decoding, not enough input samples
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SincSample(outptr,localin + ipos*nch,srcpos-ipos,nch,filter,filtsz);
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outptr += nch;
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srcpos+=drspos;
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ret++;
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}
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}
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}
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else if (!m_interp) // point sampling
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{
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|
if (nch == 1)
|
|
{
|
|
while (ns--)
|
|
{
|
|
int ipos = (int)srcpos;
|
|
if (ipos >= rsinbuf_availtemp) break; // quit decoding, not enough input samples
|
|
|
|
*outptr++ = localin[ipos];
|
|
srcpos+=drspos;
|
|
ret++;
|
|
}
|
|
}
|
|
else if (nch == 2)
|
|
{
|
|
while (ns--)
|
|
{
|
|
int ipos = (int)srcpos;
|
|
if (ipos >= rsinbuf_availtemp) break; // quit decoding, not enough input samples
|
|
|
|
ipos+=ipos;
|
|
|
|
outptr[0] = localin[ipos];
|
|
outptr[1] = localin[ipos+1];
|
|
outptr+=2;
|
|
srcpos+=drspos;
|
|
ret++;
|
|
}
|
|
}
|
|
else
|
|
while (ns--)
|
|
{
|
|
int ipos = (int)srcpos;
|
|
if (ipos >= rsinbuf_availtemp) break; // quit decoding, not enough input samples
|
|
|
|
memcpy(outptr,localin + ipos*nch,nch*sizeof(WDL_ResampleSample));
|
|
outptr += nch;
|
|
srcpos+=drspos;
|
|
ret++;
|
|
}
|
|
}
|
|
else // linear interpolation
|
|
{
|
|
if (nch == 1)
|
|
{
|
|
while (ns--)
|
|
{
|
|
int ipos = (int)srcpos;
|
|
double fracpos=srcpos-ipos;
|
|
|
|
if (ipos >= rsinbuf_availtemp-1)
|
|
{
|
|
break; // quit decoding, not enough input samples
|
|
}
|
|
|
|
double ifracpos=1.0-fracpos;
|
|
WDL_ResampleSample *inptr = localin + ipos;
|
|
*outptr++ = inptr[0]*(ifracpos) + inptr[1]*(fracpos);
|
|
srcpos+=drspos;
|
|
ret++;
|
|
}
|
|
}
|
|
else if (nch == 2)
|
|
{
|
|
while (ns--)
|
|
{
|
|
int ipos = (int)srcpos;
|
|
double fracpos=srcpos-ipos;
|
|
|
|
if (ipos >= rsinbuf_availtemp-1)
|
|
{
|
|
break; // quit decoding, not enough input samples
|
|
}
|
|
|
|
double ifracpos=1.0-fracpos;
|
|
WDL_ResampleSample *inptr = localin + ipos*2;
|
|
outptr[0] = inptr[0]*(ifracpos) + inptr[2]*(fracpos);
|
|
outptr[1] = inptr[1]*(ifracpos) + inptr[3]*(fracpos);
|
|
outptr += 2;
|
|
srcpos+=drspos;
|
|
ret++;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
while (ns--)
|
|
{
|
|
int ipos = (int)srcpos;
|
|
double fracpos=srcpos-ipos;
|
|
|
|
if (ipos >= rsinbuf_availtemp-1)
|
|
{
|
|
break; // quit decoding, not enough input samples
|
|
}
|
|
|
|
double ifracpos=1.0-fracpos;
|
|
int ch=nch;
|
|
WDL_ResampleSample *inptr = localin + ipos*nch;
|
|
while (ch--)
|
|
{
|
|
*outptr++ = inptr[0]*(ifracpos) + inptr[nch]*(fracpos);
|
|
inptr++;
|
|
}
|
|
srcpos+=drspos;
|
|
ret++;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
if (m_filtercnt>0)
|
|
{
|
|
if (m_ratio < 1.0 && ret>0) // filter output
|
|
{
|
|
if (!m_iirfilter) m_iirfilter = new WDL_Resampler_IIRFilter;
|
|
int n=m_filtercnt;
|
|
m_iirfilter->setParms(m_ratio*m_filterpos,m_filterq);
|
|
|
|
int x,a;
|
|
int offs=0;
|
|
for (x=0; x < nch; x ++)
|
|
for (a = 0; a < n; a ++)
|
|
m_iirfilter->Apply(out+x,out+x,ret,nch,offs++);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
if (ret>0 && rsinbuf_availtemp>m_samples_in_rsinbuf) // we had to pad!!
|
|
{
|
|
// check for the case where rsinbuf_availtemp>m_samples_in_rsinbuf, decrease ret down to actual valid samples
|
|
double adj=(srcpos-m_samples_in_rsinbuf + outlatadj) / drspos;
|
|
if (adj>0)
|
|
{
|
|
ret -= (int) (adj + 0.5);
|
|
if (ret<0)ret=0;
|
|
}
|
|
}
|
|
|
|
int isrcpos=(int)srcpos;
|
|
if (isrcpos > m_samples_in_rsinbuf) isrcpos=m_samples_in_rsinbuf;
|
|
m_fracpos = srcpos - isrcpos;
|
|
m_samples_in_rsinbuf -= isrcpos;
|
|
if (m_samples_in_rsinbuf <= 0) m_samples_in_rsinbuf=0;
|
|
else
|
|
memmove(localin, localin + isrcpos*nch,m_samples_in_rsinbuf*sizeof(WDL_ResampleSample)*nch);
|
|
|
|
|
|
return ret;
|
|
}
|