From 33c7ed07a673748a712963737a7b24373c5e9afc Mon Sep 17 00:00:00 2001 From: darkeye Date: Thu, 28 Mar 2002 16:44:27 +0000 Subject: [PATCH] added aflibConverter class from the OSALP project --- darkice/trunk/src/Makefile.am | 4 + darkice/trunk/src/aflibConverter.cc | 735 + darkice/trunk/src/aflibConverter.h | 245 + darkice/trunk/src/aflibConverterLargeFilter.h | 16427 ++++++++++++++++ darkice/trunk/src/aflibConverterSmallFilter.h | 4638 +++++ 5 files changed, 22049 insertions(+) create mode 100644 darkice/trunk/src/aflibConverter.cc create mode 100644 darkice/trunk/src/aflibConverter.h create mode 100644 darkice/trunk/src/aflibConverterLargeFilter.h create mode 100644 darkice/trunk/src/aflibConverterSmallFilter.h diff --git a/darkice/trunk/src/Makefile.am b/darkice/trunk/src/Makefile.am index ca7ea67..fe231fa 100644 --- a/darkice/trunk/src/Makefile.am +++ b/darkice/trunk/src/Makefile.am @@ -29,6 +29,10 @@ darkice_SOURCES = AudioEncoder.h\ LameLibEncoder.h\ VorbisLibEncoder.cpp\ VorbisLibEncoder.h\ + aflibConverter.h\ + aflibConverter.cc\ + aflibConverterLargeFilter.h\ + aflibConverterSmallFilter.h\ OssDspSource.cpp\ OssDspSource.h\ SolarisDspSource.cpp\ diff --git a/darkice/trunk/src/aflibConverter.cc b/darkice/trunk/src/aflibConverter.cc new file mode 100644 index 0000000..5a2272e --- /dev/null +++ b/darkice/trunk/src/aflibConverter.cc @@ -0,0 +1,735 @@ +/* + * Copyright: (C) 2000 Julius O. Smith + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Julius O. Smith jos@ccrma.stanford.edu + * + */ +/* This code was modified by Bruce Forsberg (forsberg@adnc.com) to make it + into a C++ class +*/ + + +#include +#include +#include +#include + +#include "aflibConverter.h" +#include "aflibConverterLargeFilter.h" +#include "aflibConverterSmallFilter.h" + + +#if (!defined(TRUE) || !defined(FALSE)) +# define TRUE 1 +# define FALSE 0 +#endif + + +/* + * The configuration constants below govern + * the number of bits in the input sample and filter coefficients, the + * number of bits to the right of the binary-point for fixed-point math, etc. + */ + +/* Conversion constants */ +#define Nhc 8 +#define Na 7 +#define Np (Nhc+Na) +#define Npc (1< (inCount - (int)framecount)) + { + Nsamps = inCount - framecount; + } + + for (c = 0; c < nChans; c++) + { + ptr = outPtr[c]; + ptr += Xoff; /* Start at designated sample number */ + + for (i = 0; i < Nsamps; i++) + *ptr++ = (HWORD) inArray[c * inCount + i + framecount]; + } + + framecount += Nsamps; + + if ((int)framecount >= inCount) /* return index of last samp */ + return (((Nsamps - (framecount - inCount)) - 1) + Xoff); + else + return 0; +} + + +int +aflibConverter::SrcLinear( + HWORD X[], + HWORD Y[], + double factor, + UWORD *Time, + UHWORD& Nx, + UHWORD Nout) +{ + HWORD iconst; + HWORD *Xp, *Ystart; + WORD v,x1,x2; + + double dt; /* Step through input signal */ + UWORD dtb; /* Fixed-point version of Dt */ + UWORD endTime; /* When Time reaches EndTime, return to user */ + UWORD start_sample, end_sample; + + dt = 1.0/factor; /* Output sampling period */ + dtb = (UWORD)(dt*(1<>Np; + Ystart = Y; + endTime = *Time + (1<>Np]; /* Ptr to current input sample */ + x1 = *Xp++; + x2 = *Xp; + x1 *= ((1<>Np; + Nx = end_sample - start_sample; + return (Y - Ystart); /* Return number of output samples */ +} + + +int +aflibConverter::SrcUp( + HWORD X[], + HWORD Y[], + double factor, + UWORD *Time, + UHWORD& Nx, + UHWORD Nout, + UHWORD Nwing, + UHWORD LpScl, + HWORD Imp[], + HWORD ImpD[], + BOOL Interp) +{ + HWORD *Xp, *Ystart; + WORD v; + + double dt; /* Step through input signal */ + UWORD dtb; /* Fixed-point version of Dt */ + UWORD endTime; /* When Time reaches EndTime, return to user */ + UWORD start_sample, end_sample; + + dt = 1.0/factor; /* Output sampling period */ + dtb = (UWORD)(dt*(1<>Np; + Ystart = Y; + endTime = *Time + (1<>Np]; /* Ptr to current input sample */ + /* Perform left-wing inner product */ + v = FilterUp(Imp, ImpD, Nwing, Interp, Xp, (HWORD)(*Time&Pmask),-1); + /* Perform right-wing inner product */ + v += FilterUp(Imp, ImpD, Nwing, Interp, Xp+1, + (HWORD)((-*Time)&Pmask),1); + v >>= Nhg; /* Make guard bits */ + v *= LpScl; /* Normalize for unity filter gain */ + *Y++ = WordToHword(v,NLpScl); /* strip guard bits, deposit output */ + *Time += dtb; /* Move to next sample by time increment */ + } + end_sample = (*Time)>>Np; + Nx = end_sample - start_sample; + return (Y - Ystart); /* Return the number of output samples */ +} + + + +int +aflibConverter::SrcUD( + HWORD X[], + HWORD Y[], + double factor, + UWORD *Time, + UHWORD& Nx, + UHWORD Nout, + UHWORD Nwing, + UHWORD LpScl, + HWORD Imp[], + HWORD ImpD[], + BOOL Interp) +{ + HWORD *Xp, *Ystart; + WORD v; + + double dh; /* Step through filter impulse response */ + double dt; /* Step through input signal */ + UWORD endTime; /* When Time reaches EndTime, return to user */ + UWORD dhb, dtb; /* Fixed-point versions of Dh,Dt */ + UWORD start_sample, end_sample; + + dt = 1.0/factor; /* Output sampling period */ + dtb = (UWORD)(dt*(1<>Np; + Ystart = Y; + endTime = *Time + (1<>Np]; /* Ptr to current input sample */ + v = FilterUD(Imp, ImpD, Nwing, Interp, Xp, (HWORD)(*Time&Pmask), + -1, dhb); /* Perform left-wing inner product */ + v += FilterUD(Imp, ImpD, Nwing, Interp, Xp+1, (HWORD)((-*Time)&Pmask), + 1, dhb); /* Perform right-wing inner product */ + v >>= Nhg; /* Make guard bits */ + v *= LpScl; /* Normalize for unity filter gain */ + *Y++ = WordToHword(v,NLpScl); /* strip guard bits, deposit output */ + *Time += dtb; /* Move to next sample by time increment */ + } + end_sample = (*Time)>>Np; + Nx = end_sample - start_sample; + return (Y - Ystart); /* Return the number of output samples */ +} + + +int +aflibConverter::resampleFast( /* number of output samples returned */ + int& inCount, /* number of input samples to convert */ + int outCount, /* number of output samples to compute */ + HWORD inArray[], /* input data */ + HWORD outArray[]) /* output data */ +{ + UWORD Time2; /* Current time/pos in input sample */ +#if 0 + UHWORD Ncreep; +#endif + UHWORD Xp, Xoff, Xread; + int OBUFFSIZE = (int)(((double)IBUFFSIZE)*factor); + UHWORD Nout = 0, Nx; + UHWORD maxOutput; + int total_inCount = 0; + int c, i, Ycount, last; + bool first_pass = TRUE; + + + Xoff = 10; + + Nx = IBUFFSIZE - 2*Xoff; /* # of samples to process each iteration */ + last = 0; /* Have not read last input sample yet */ + Ycount = 0; /* Current sample and length of output file */ + + Xp = Xoff; /* Current "now"-sample pointer for input */ + Xread = Xoff; /* Position in input array to read into */ + + if (initial == TRUE) + Time = (Xoff< (OBUFFSIZE - (2*Xoff*factor)) ) + maxOutput = OBUFFSIZE - (UHWORD)(2*Xoff*factor); + else + maxOutput = outCount-Ycount; + + for (c = 0; c < nChans; c++) + { + Time2 = Time; + /* Resample stuff in input buffer */ + Nout=SrcLinear(X[c],Y[c],factor,&Time2,Nx,maxOutput); + } + Time = Time2; + + Time -= (Nx<>Np) - Xoff; /* Calc time accumulation in Time */ + if (Ncreep) { + Time -= (Ncreep<outCount) { + Nout -= (Ycount-outCount); + Ycount = outCount; + } + + if (Nout > OBUFFSIZE) /* Check to see if output buff overflowed */ + return err_ret("Output array overflow"); + + for (c = 0; c < nChans; c++) + for (i = 0; i < Nout; i++) + outArray[c * outCount + i + Ycount - Nout] = Y[c][i]; + + total_inCount += Nx; + + } while (Ycount (OBUFFSIZE - (2*Xoff*factor)) ) + maxOutput = OBUFFSIZE - (UHWORD)(2*Xoff*factor); + else + maxOutput = outCount-Ycount; + + for (c = 0; c < nChans; c++) + { + Time2 = Time; + /* Resample stuff in input buffer */ + if (factor >= 1) { /* SrcUp() is faster if we can use it */ + Nout=SrcUp(X[c],Y[c],factor,&Time2,Nx,maxOutput,Nwing,LpScl,Imp,ImpD,interpFilt); + } + else { + Nout=SrcUD(X[c],Y[c],factor,&Time2,Nx,maxOutput,Nwing,LpScl,Imp,ImpD,interpFilt); + } + } + Time = Time2; + + Time -= (Nx<>Np) - Xoff; /* Calc time accumulation in Time */ + if (Ncreep) { + Time -= (Ncreep<outCount) { + Nout -= (Ycount-outCount); + Ycount = outCount; + } + + if (Nout > OBUFFSIZE) /* Check to see if output buff overflowed */ + return err_ret("Output array overflow"); + + for (c = 0; c < nChans; c++) + { + for (i = 0; i < Nout; i++) + { + outArray[c * outCount + i + Ycount - Nout] = Y[c][i]; + } + } + + int act_incount = (int)Nx; + + for (c = 0; c < nChans; c++) + { + for (i=0; i>Na]; + End = &Imp[Nwing]; + if (Interp) { + Hdp = &ImpD[Ph>>Na]; + a = Ph & Amask; + } + if (Inc == 1) /* If doing right wing... */ + { /* ...drop extra coeff, so when Ph is */ + End--; /* 0.5, we don't do too many mult's */ + if (Ph == 0) /* If the phase is zero... */ + { /* ...then we've already skipped the */ + Hp += Npc; /* first sample, so we must also */ + Hdp += Npc; /* skip ahead in Imp[] and ImpD[] */ + } + } + if (Interp) + while (Hp < End) { + t = *Hp; /* Get filter coeff */ + t += (((WORD)*Hdp)*a)>>Na; /* t is now interp'd filter coeff */ + Hdp += Npc; /* Filter coeff differences step */ + t *= *Xp; /* Mult coeff by input sample */ + if (t & (1<<(Nhxn-1))) /* Round, if needed */ + t += (1<<(Nhxn-1)); + t >>= Nhxn; /* Leave some guard bits, but come back some */ + v += t; /* The filter output */ + Hp += Npc; /* Filter coeff step */ + Xp += Inc; /* Input signal step. NO CHECK ON BOUNDS */ + } + else + while (Hp < End) { + t = *Hp; /* Get filter coeff */ + t *= *Xp; /* Mult coeff by input sample */ + if (t & (1<<(Nhxn-1))) /* Round, if needed */ + t += (1<<(Nhxn-1)); + t >>= Nhxn; /* Leave some guard bits, but come back some */ + v += t; /* The filter output */ + Hp += Npc; /* Filter coeff step */ + Xp += Inc; /* Input signal step. NO CHECK ON BOUNDS */ + } + return(v); +} + + +WORD +aflibConverter::FilterUD( HWORD Imp[], HWORD ImpD[], + UHWORD Nwing, BOOL Interp, + HWORD *Xp, HWORD Ph, HWORD Inc, UHWORD dhb) +{ + HWORD a; + HWORD *Hp, *Hdp, *End; + WORD v, t; + UWORD Ho; + + v=0; + Ho = (Ph*(UWORD)dhb)>>Np; + End = &Imp[Nwing]; + if (Inc == 1) /* If doing right wing... */ + { /* ...drop extra coeff, so when Ph is */ + End--; /* 0.5, we don't do too many mult's */ + if (Ph == 0) /* If the phase is zero... */ + Ho += dhb; /* ...then we've already skipped the */ + } /* first sample, so we must also */ + /* skip ahead in Imp[] and ImpD[] */ + if (Interp) + while ((Hp = &Imp[Ho>>Na]) < End) { + t = *Hp; /* Get IR sample */ + Hdp = &ImpD[Ho>>Na]; /* get interp (lower Na) bits from diff table*/ + a = Ho & Amask; /* a is logically between 0 and 1 */ + t += (((WORD)*Hdp)*a)>>Na; /* t is now interp'd filter coeff */ + t *= *Xp; /* Mult coeff by input sample */ + if (t & 1<<(Nhxn-1)) /* Round, if needed */ + t += 1<<(Nhxn-1); + t >>= Nhxn; /* Leave some guard bits, but come back some */ + v += t; /* The filter output */ + Ho += dhb; /* IR step */ + Xp += Inc; /* Input signal step. NO CHECK ON BOUNDS */ + } + else + while ((Hp = &Imp[Ho>>Na]) < End) { + t = *Hp; /* Get IR sample */ + t *= *Xp; /* Mult coeff by input sample */ + if (t & 1<<(Nhxn-1)) /* Round, if needed */ + t += 1<<(Nhxn-1); + t >>= Nhxn; /* Leave some guard bits, but come back some */ + v += t; /* The filter output */ + Ho += dhb; /* IR step */ + Xp += Inc; /* Input signal step. NO CHECK ON BOUNDS */ + } + return(v); +} + diff --git a/darkice/trunk/src/aflibConverter.h b/darkice/trunk/src/aflibConverter.h new file mode 100644 index 0000000..e8d9500 --- /dev/null +++ b/darkice/trunk/src/aflibConverter.h @@ -0,0 +1,245 @@ +/* + * Copyright: (C) 2000 Julius O. Smith + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Julius O. Smith jos@ccrma.stanford.edu + * + */ +/* This code was modified by Bruce Forsberg (forsberg@adnc.com) to make it + into a C++ class +*/ + + +#ifndef _AFLIBCONVERTER_H_ +#define _AFLIBCONVERTER_H_ + +#ifndef MAX +#define MAX(x,y) ((x)>(y) ?(x):(y)) +#endif +#ifndef MIN +#define MIN(x,y) ((x)<(y) ?(x):(y)) +#endif + +#define MAX_HWORD (32767) +#define MIN_HWORD (-32768) + +typedef char BOOL; +typedef short HWORD; +typedef unsigned short UHWORD; +typedef int WORD; +typedef unsigned int UWORD; +#define IBUFFSIZE 4096 /* Input buffer size */ + +/*! \class aflibConverter + \brief Provides sample rate conversion. + + This class will perform audio resampling. With the constructor you can choose the + type of resampling to be done. Simple linear interpolation can be done by setting + linear_interpolation to be TRUE in the constructor. The other two flags are + ignored if this is set. If linear_interpolation is FALSE then some form of filtering + will be done. IF high_quality is FALSE then a small filter will be performed. + If high_quality is TRUE then a large filter (higher quality) will be performed. For + both the small and large filters another parameter can be specified, filter_interpolation. + With filter_interpolation set then the filter coefficients used for both the small and + large filtering will be interpolated as well. + + This class was designed to stream audio data. It also expects audio data as 16 bit values. + Each time a new stream is started some initialization needs to be done. Thus the function + initialize should be called to initialize everything. This class will work on any + number of channels. Once everything is specified then resample should be called as many + times as is necessary to process all the data. The value inCount will be returned + indicating how many inArray samples were actually used to produce the output. This + value can be used to indicate where the next block of inArray data should start. The + resample function is driven by the outCount value specified. The inArray should + contain at least: + outCount / factor + extra_samples. + extra_samples depends on the type of filtering done. As a rule of thumb 50 should be + adequate for any type of filter. +*/ + + +class aflibConverter { + +public: + + // Available contructors and destructors + aflibConverter ( + bool high_quality, + bool linear_interpolation, + bool filter_interpolation); + + ~aflibConverter(); + + void + initialize( + double factor, /* factor = Sndout/Sndin */ + int channels);/* number of sound channels */ + + int + resample( /* number of output samples returned */ + int& inCount, /* number of input samples to convert */ + int outCount, /* number of output samples to compute */ + HWORD inArray[], /* input array data (length inCount * nChans) */ + HWORD outArray[]);/* output array data (length outCount * nChans) */ + + +private: + + aflibConverter(); + + aflibConverter(const aflibConverter& op); + + const aflibConverter& + operator=(const aflibConverter& op); + + int + err_ret(char *s); + + void + deleteMemory(); + + int + readData( + int inCount, /* _total_ number of frames in input file */ + HWORD inArray[], /* input data */ + HWORD *outPtr[], /* array receiving chan samps */ + int dataArraySize, /* size of these arrays */ + int Xoff, /* read into input array starting at this index */ + bool init_count); + + + inline HWORD + WordToHword(WORD v, int scl) + { + HWORD out; + WORD llsb = (1<<(scl-1)); + v += llsb; /* round */ + v >>= scl; + if (v>MAX_HWORD) { +#ifdef DEBUG + if (pof == 0) + fprintf(stderr, "*** resample: sound sample overflow\n"); + else if ((pof % 10000) == 0) + fprintf(stderr, "*** resample: another ten thousand overflows\n"); + pof++; +#endif + v = MAX_HWORD; + } else if (v < MIN_HWORD) { +#ifdef DEBUG + if (nof == 0) + fprintf(stderr, "*** resample: sound sample (-) overflow\n"); + else if ((nof % 1000) == 0) + fprintf(stderr, "*** resample: another thousand (-) overflows\n"); + nof++; +#endif + v = MIN_HWORD; + } + out = (HWORD) v; + return out; + }; + + int + SrcLinear( + HWORD X[], + HWORD Y[], + double factor, + UWORD *Time, + UHWORD& Nx, + UHWORD Nout); + + int + SrcUp( + HWORD X[], + HWORD Y[], + double factor, + UWORD *Time, + UHWORD& Nx, + UHWORD Nout, + UHWORD Nwing, + UHWORD LpScl, + HWORD Imp[], + HWORD ImpD[], + BOOL Interp); + + int + SrcUD( + HWORD X[], + HWORD Y[], + double factor, + UWORD *Time, + UHWORD& Nx, + UHWORD Nout, + UHWORD Nwing, + UHWORD LpScl, + HWORD Imp[], + HWORD ImpD[], + BOOL Interp); + + WORD + FilterUp( + HWORD Imp[], + HWORD ImpD[], + UHWORD Nwing, + BOOL Interp, + HWORD *Xp, + HWORD Ph, + HWORD Inc); + + WORD + FilterUD( + HWORD Imp[], + HWORD ImpD[], + UHWORD Nwing, + BOOL Interp, + HWORD *Xp, + HWORD Ph, + HWORD Inc, + UHWORD dhb); + + int + resampleFast( /* number of output samples returned */ + int& inCount, /* number of input samples to convert */ + int outCount, /* number of output samples to compute */ + HWORD inArray[], /* input array data (length inCount * nChans) */ + HWORD outArray[]);/* output array data (length outCount * nChans) */ + + int + resampleWithFilter( /* number of output samples returned */ + int& inCount, /* number of input samples to convert */ + int outCount, /* number of output samples to compute */ + HWORD inArray[], /* input array data (length inCount * nChans) */ + HWORD outArray[], /* output array data (length outCount * nChans) */ + HWORD Imp[], HWORD ImpD[], + UHWORD LpScl, UHWORD Nmult, UHWORD Nwing); + + +static HWORD SMALL_FILTER_IMP[]; +static HWORD LARGE_FILTER_IMP[]; + +bool interpFilt; +bool largeFilter; +bool linearInterp; +HWORD ** X; +HWORD ** Y; +UWORD Time; +double factor; +int nChans; +bool initial; + +}; + + +#endif diff --git a/darkice/trunk/src/aflibConverterLargeFilter.h b/darkice/trunk/src/aflibConverterLargeFilter.h new file mode 100644 index 0000000..61f4642 --- /dev/null +++ b/darkice/trunk/src/aflibConverterLargeFilter.h @@ -0,0 +1,16427 @@ +/* + * Copyright: (C) 2000 Julius O. Smith + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Julius O. Smith jos@ccrma.stanford.edu + * + */ + +/* + +The default filter requires an +oversampling factor of around 20% to avoid aliasing. The expensive +filter is five times more computationally expensive and requires only +about a 5-10% oversampling factor. Both filters have comparable +stop-band attenuations (approximately 80 dB). The +expensive filter is not yet documented because its cut-off frequency +should be retuned slightly for optimal performance. Also, we plan to +compute truly optimized resampling filters sometime in the future. In +the meantime, the default filter is fast, well tuned, and works very +well for its level of computational expense. + +*/ + +#define LARGE_FILTER_NMULT ((HWORD)65) +#define LARGE_FILTER_SCALE 14746 /* Unity-gain scale factor */ +#define LARGE_FILTER_NWING 8192 /* Filter table length */ + +HWORD aflibConverter::LARGE_FILTER_IMP[] /* Impulse response */ = { +32767, +32766, +32764, +32761, +32756, +32750, +32743, +32734, +32724, +32713, +32700, +32686, +32671, +32654, +32636, +32617, +32596, +32574, +32551, +32526, +32500, +32473, +32445, +32415, +32383, +32351, +32317, +32282, +32246, +32208, +32169, +32129, +32087, +32044, +32000, +31955, +31908, +31860, +31811, +31760, +31708, +31655, +31601, +31545, +31489, +31431, +31371, +31311, +31249, +31186, +31122, +31056, +30990, +30922, +30853, +30783, +30711, +30639, +30565, +30490, +30414, +30337, +30258, +30179, +30098, +30016, +29933, +29849, +29764, +29677, +29590, +29501, +29411, +29321, +29229, +29136, +29042, +28947, +28851, +28753, 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Smith + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Julius O. Smith jos@ccrma.stanford.edu + * + */ + +#define SMALL_FILTER_NMULT ((HWORD)13) +#define SMALL_FILTER_SCALE 13128 /* Unity-gain scale factor */ +#define SMALL_FILTER_NWING 1536 /* Filter table length */ + +HWORD aflibConverter::SMALL_FILTER_IMP[] /* Impulse response */ = { +32767, +32766, +32764, +32760, +32755, +32749, +32741, +32731, +32721, +32708, +32695, +32679, +32663, +32645, +32625, +32604, +32582, +32558, +32533, +32506, +32478, +32448, +32417, +32385, +32351, +32316, +32279, +32241, +32202, +32161, +32119, +32075, +32030, +31984, +31936, +31887, +31836, +31784, +31731, +31676, +31620, +31563, +31504, +31444, +31383, +31320, +31256, +31191, +31124, +31056, +30987, +30916, +30845, +30771, +30697, +30621, +30544, +30466, +30387, +30306, +30224, +30141, +30057, +29971, +29884, +29796, +29707, +29617, +29525, +29433, +29339, +29244, +29148, +29050, +28952, +28852, +28752, +28650, +28547, +28443, +28338, +28232, +28125, +28017, +27908, +27797, +27686, +27574, +27461, +27346, 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