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94 lines
2.8 KiB
C++
94 lines
2.8 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2001-2004 The ScummVM project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*
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*/
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#ifndef SOUND_RESAMPLE_H
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#define SOUND_RESAMPLE_H
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#include "sound/rate.h"
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/* this Float MUST match that in filter.c */
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#define Float double/*float*/
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// From resample's stddef.h
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typedef int16 HWORD;
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typedef uint16 UHWORD;
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typedef int32 WORD;
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typedef uint32 UWORD;
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#define MAX_HWORD (32767)
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#define MIN_HWORD (-32768)
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#define MAXNWING 8192
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/* Private data for Lerp via LCM file */
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typedef struct resamplestuff {
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double Factor; /* Factor = Fout/Fin sample rates */
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int quadr; /* non-zero to use qprodUD quadratic interpolation */
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long Nq;
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long dhb;
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long a, b; /* gcd-reduced input,output rates */
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long t; /* Current time/pos for exact-coeff's method */
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long Xh; /* number of past/future samples needed by filter */
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long Xoff; /* Xh plus some room for creep */
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long Xread; /* X[Xread] is start-position to enter new samples */
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long Xp; /* X[Xp] is position to start filter application */
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long Xsize, Ysize; /* size (Floats) of X[],Y[] */
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long Yposition; /* FIXME: offset into Y buffer */
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Float *X, *Y; /* I/O buffers */
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} *resample_t;
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/** High quality rate conversion algorithm, based on SoX (http://sox.sourceforge.net). */
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class ResampleRateConverter : public RateConverter {
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protected:
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resamplestuff rstuff;
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int quadr; /* non-zero to use qprodUD quadratic interpolation */
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UHWORD LpScl; /* Unity-gain scale factor */
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UHWORD Nwing; /* Filter table size */
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UHWORD Nmult; /* Filter length for up-conversions */
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HWORD Imp[MAXNWING]; /* Filter coefficients */
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HWORD ImpD[MAXNWING]; /* ImpD[n] = Imp[n+1]-Imp[n] */
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HWORD *X1, *Y1;
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HWORD *X2, *Y2;
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UWORD Time; /* Current time/pos in input sample */
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public:
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ResampleRateConverter(st_rate_t inrate, st_rate_t outrate, int quality);
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~ResampleRateConverter();
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virtual int flow(AudioStream &input, st_sample_t *obuf, st_size_t osamp, st_volume_t vol);
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virtual int drain(st_sample_t *obuf, st_size_t osamp, st_volume_t vol);
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};
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#endif
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