Finished libresample removal
This commit is contained in:
mudlord
parent
81e02386b4
commit
98cd8a44e3
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@ -1,481 +0,0 @@
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#include <math.h>
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#include "libresample-0.1.3/include/libresample.h"
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#include "snd_interp.h"
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// this was once borrowed from libmodplug, and was also used to generate the FIR coefficient
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// tables that ZSNES uses for its "FIR" interpolation mode
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/*
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------------------------------------------------------------------------------------------------
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fir interpolation doc,
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(derived from "an engineer's guide to fir digital filters", n.j. loy)
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calculate coefficients for ideal lowpass filter (with cutoff = fc in 0..1 (mapped to 0..nyquist))
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c[-N..N] = (i==0) ? fc : sin(fc*pi*i)/(pi*i)
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then apply selected window to coefficients
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c[-N..N] *= w(0..N)
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with n in 2*N and w(n) being a window function (see loy)
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then calculate gain and scale filter coefs to have unity gain.
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------------------------------------------------------------------------------------------------
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*/
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// quantizer scale of window coefs
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#define WFIR_QUANTBITS 14
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#define WFIR_QUANTSCALE (1L<<WFIR_QUANTBITS)
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#define WFIR_8SHIFT (WFIR_QUANTBITS-8)
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#define WFIR_16BITSHIFT (WFIR_QUANTBITS)
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// log2(number)-1 of precalculated taps range is [4..12]
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#define WFIR_FRACBITS 12
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#define WFIR_LUTLEN ((1L<<(WFIR_FRACBITS+1))+1)
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// number of samples in window
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#define WFIR_LOG2WIDTH 3
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#define WFIR_WIDTH (1L<<WFIR_LOG2WIDTH)
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#define WFIR_SMPSPERWING ((WFIR_WIDTH-1)>>1)
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// cutoff (1.0 == pi/2)
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#define WFIR_CUTOFF 0.95f
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// wfir type
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#define WFIR_HANN 0
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#define WFIR_HAMMING 1
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#define WFIR_BLACKMANEXACT 2
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#define WFIR_BLACKMAN3T61 3
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#define WFIR_BLACKMAN3T67 4
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#define WFIR_BLACKMAN4T92 5
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#define WFIR_BLACKMAN4T74 6
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#define WFIR_KAISER4T 7
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#define WFIR_LANCZOS 8
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#define WFIR_TYPE WFIR_LANCZOS
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// wfir help
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#ifndef M_zPI
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#define M_zPI 3.1415926535897932384626433832795
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#endif
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#define M_zEPS 1e-8
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#define M_zBESSELEPS 1e-21
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class CzWINDOWEDFIR
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{ public:
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CzWINDOWEDFIR( );
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~CzWINDOWEDFIR( );
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float coef( int _PCnr, float _POfs, float _PCut, int _PWidth, int _PType ) //float _PPos, float _PFc, int _PLen )
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{ double _LWidthM1 = _PWidth-1;
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double _LWidthM1Half = 0.5*_LWidthM1;
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double _LPosU = ((double)_PCnr - _POfs);
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double _LPos = _LPosU-_LWidthM1Half;
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double _LPIdl = 2.0*M_zPI/_LWidthM1;
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double _LWc,_LSi;
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if( fabs(_LPos)<M_zEPS )
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{ _LWc = 1.0;
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_LSi = _PCut;
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}
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else
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{ switch( _PType )
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{ case WFIR_HANN:
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_LWc = 0.50 - 0.50 * cos(_LPIdl*_LPosU);
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break;
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case WFIR_HAMMING:
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_LWc = 0.54 - 0.46 * cos(_LPIdl*_LPosU);
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break;
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case WFIR_BLACKMANEXACT:
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_LWc = 0.42 - 0.50 * cos(_LPIdl*_LPosU) + 0.08 * cos(2.0*_LPIdl*_LPosU);
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break;
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case WFIR_BLACKMAN3T61:
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_LWc = 0.44959 - 0.49364 * cos(_LPIdl*_LPosU) + 0.05677 * cos(2.0*_LPIdl*_LPosU);
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break;
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case WFIR_BLACKMAN3T67:
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_LWc = 0.42323 - 0.49755 * cos(_LPIdl*_LPosU) + 0.07922 * cos(2.0*_LPIdl*_LPosU);
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break;
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case WFIR_BLACKMAN4T92:
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_LWc = 0.35875 - 0.48829 * cos(_LPIdl*_LPosU) + 0.14128 * cos(2.0*_LPIdl*_LPosU) - 0.01168 * cos(3.0*_LPIdl*_LPosU);
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break;
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case WFIR_BLACKMAN4T74:
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_LWc = 0.40217 - 0.49703 * cos(_LPIdl*_LPosU) + 0.09392 * cos(2.0*_LPIdl*_LPosU) - 0.00183 * cos(3.0*_LPIdl*_LPosU);
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break;
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case WFIR_KAISER4T:
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_LWc = 0.40243 - 0.49804 * cos(_LPIdl*_LPosU) + 0.09831 * cos(2.0*_LPIdl*_LPosU) - 0.00122 * cos(3.0*_LPIdl*_LPosU);
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break;
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case WFIR_LANCZOS:
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_LWc = 1 - (sin(_LPIdl*_LPosU) / (_LPIdl*_LPosU));
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break;
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default:
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_LWc = 1.0;
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break;
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}
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_LPos *= M_zPI;
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_LSi = sin(_PCut*_LPos)/_LPos;
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}
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return (float)(_LWc*_LSi);
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}
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static signed short lut[WFIR_LUTLEN*WFIR_WIDTH];
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};
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signed short CzWINDOWEDFIR::lut[WFIR_LUTLEN*WFIR_WIDTH];
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CzWINDOWEDFIR::CzWINDOWEDFIR()
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{ int _LPcl;
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float _LPcllen = (float)(1L<<WFIR_FRACBITS); // number of precalculated lines for 0..1 (-1..0)
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float _LNorm = 1.0f / (float)(2.0f * _LPcllen);
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float _LCut = WFIR_CUTOFF;
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float _LScale = (float)WFIR_QUANTSCALE;
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float _LGain,_LCoefs[WFIR_WIDTH];
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for( _LPcl=0;_LPcl<WFIR_LUTLEN;_LPcl++ )
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{
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float _LOfs = ((float)_LPcl-_LPcllen)*_LNorm;
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int _LCc,_LIdx = _LPcl<<WFIR_LOG2WIDTH;
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for( _LCc=0,_LGain=0.0f;_LCc<WFIR_WIDTH;_LCc++ )
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{ _LGain += (_LCoefs[_LCc] = coef( _LCc, _LOfs, _LCut, WFIR_WIDTH, WFIR_TYPE ));
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}
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_LGain = 1.0f/_LGain;
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for( _LCc=0;_LCc<WFIR_WIDTH;_LCc++ )
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{ float _LCoef = (float)floor( 0.5 + _LScale*_LCoefs[_LCc]*_LGain );
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lut[_LIdx+_LCc] = (signed short)( (_LCoef<-_LScale)?-_LScale:((_LCoef>_LScale)?_LScale:_LCoef) );
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}
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}
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}
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CzWINDOWEDFIR::~CzWINDOWEDFIR()
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{ // nothing todo
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}
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CzWINDOWEDFIR sfir;
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template <class T, int buffer_size>
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class sample_buffer
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{
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int ptr, filled;
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T * buffer;
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public:
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sample_buffer() : ptr(0), filled(0)
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{
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buffer = new T[buffer_size];
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}
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~sample_buffer()
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{
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if (buffer) delete [] buffer;
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}
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void clear()
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{
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ptr = filled = 0;
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}
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inline int size() const
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{
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return filled;
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}
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inline void push_back(T sample)
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{
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buffer[ptr] = sample;
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if (++ptr >= buffer_size) ptr = 0;
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if (filled < buffer_size) filled++;
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}
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inline void erase(int count)
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{
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if (count > filled) filled = 0;
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else filled -= count;
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}
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inline T operator[] (int index) const
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{
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index += ptr - filled;
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if (index < 0) index += buffer_size;
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else if (index > buffer_size) index -= buffer_size;
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return buffer[index];
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}
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};
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class foo_null : public foo_interpolate
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{
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int sample;
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public:
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foo_null() : sample(0) {}
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~foo_null() {}
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void reset() {}
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void push(int psample)
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{
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sample = psample;
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}
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int pop()
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{
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return sample;
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}
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};
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class foo_linear : public foo_interpolate
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{
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sample_buffer<int,4> samples;
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int position;
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inline int smp(int index)
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{
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return samples[index];
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}
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public:
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foo_linear()
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{
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position = 0;
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}
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~foo_linear() {}
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void reset()
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{
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position = 0;
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samples.clear();
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}
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void push(int sample)
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{
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samples.push_back(sample);
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}
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int pop()
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{
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int ret;
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if (position > 0x7fff)
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{
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int howmany = position >> 15;
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position &= 0x7fff;
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samples.erase(howmany);
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}
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if (samples.size() < 2) return 0;
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ret = smp(0) * (0x8000 - position);
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ret += smp(1) * position;
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ret >>= 15;
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position+=lrate;
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return ret;
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}
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};
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// and this integer cubic interpolation implementation was kind of borrowed from either TiMidity
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// or the P.E.Op.S. SPU project, or is in use in both, or something...
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class foo_cubic : public foo_interpolate
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{
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sample_buffer<int,12> samples;
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int position;
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inline int smp(int index)
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{
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return samples[index];
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}
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public:
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foo_cubic()
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{
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position = 0;
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}
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~foo_cubic() {}
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void reset()
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{
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position = 0;
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samples.clear();
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}
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void push(int sample)
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{
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samples.push_back(sample);
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}
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int pop()
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{
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int ret;
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if (position > 0x7fff)
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{
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int howmany = position >> 15;
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position &= 0x7fff;
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samples.erase(howmany);
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}
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if (samples.size() < 4) return 0;
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ret = smp(3) - 3 * smp(2) + 3 * smp(1) - smp(0);
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ret *= (position - (2 << 15)) / 6;
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ret >>= 15;
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ret += smp(2) - 2 * smp(1) + smp(0);
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ret *= (position - (1 << 15)) >> 1;
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ret >>= 15;
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ret += smp(1) - smp(0);
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ret *= position;
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ret >>= 15;
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ret += smp(0);
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if (ret > 32767) ret = 32767;
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else if (ret < -32768) ret = -32768;
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position+=lrate;
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return ret;
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}
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};
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class foo_fir : public foo_interpolate
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{
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sample_buffer<int,24> samples;
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int position;
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inline int smp(int index)
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{
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return samples[index];
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}
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public:
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foo_fir()
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{
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position = 0;
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}
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~foo_fir()
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{
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position=666;
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}
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void reset()
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{
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position = 0;
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samples.clear();
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}
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void push(int sample)
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{
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samples.push_back(sample);
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}
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int pop()
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{
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int ret;
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if (position > 0x7fff)
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{
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int howmany = position >> 15;
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position &= 0x7fff;
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samples.erase(howmany);
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}
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if (samples.size() < 8) return 0;
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ret = smp(0) * CzWINDOWEDFIR::lut[(position & ~7) ];
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ret += smp(1) * CzWINDOWEDFIR::lut[(position & ~7) + 1];
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ret += smp(2) * CzWINDOWEDFIR::lut[(position & ~7) + 2];
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ret += smp(3) * CzWINDOWEDFIR::lut[(position & ~7) + 3];
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ret += smp(4) * CzWINDOWEDFIR::lut[(position & ~7) + 4];
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ret += smp(5) * CzWINDOWEDFIR::lut[(position & ~7) + 5];
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ret += smp(6) * CzWINDOWEDFIR::lut[(position & ~7) + 6];
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ret += smp(7) * CzWINDOWEDFIR::lut[(position & ~7) + 7];
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ret >>= WFIR_QUANTBITS;
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if (ret > 32767) ret = 32767;
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else if (ret < -32768) ret = -32768;
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position+=lrate;
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return ret;
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}
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};
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class foo_libresample : public foo_interpolate
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{
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sample_buffer<float,32> samples;
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void * resampler;
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public:
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foo_libresample()
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{
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resampler = 0;
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}
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~foo_libresample()
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{
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reset();
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}
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void reset()
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{
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samples.clear();
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if (resampler)
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{
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resample_close(resampler);
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resampler = 0;
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}
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}
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void push(int sample)
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{
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samples.push_back(float(sample));
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}
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int pop()
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{
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int ret;
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if (!resampler)
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{
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resampler = resample_open(0, .25, 44100. / 4000.);
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}
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{
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int count = samples.size();
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float * in = new float[count];
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float out;
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int used, returned;
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for (used = 0; used < count; used++)
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{
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in[used] = samples[used];
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}
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returned = resample_process(resampler, 32767. / lrate, in, count, 0, &used, &out, 1);
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if (used)
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{
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samples.erase(used);
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}
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delete [] in;
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if (returned < 1) return 0;
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ret = (int)out;
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}
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if (ret > 32767) ret = 32767;
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else if (ret < -32768) ret = -32768;
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return ret;
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}
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};
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foo_interpolate * get_filter(int which)
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{
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switch (which)
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{
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default:
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return new foo_null;
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case 1:
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return new foo_linear;
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case 2:
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return new foo_cubic;
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case 3:
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return new foo_fir;
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case 4:
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return new foo_libresample;
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}
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}
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@ -1,35 +0,0 @@
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#ifndef __SND_INTERP_H__
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#define __SND_INTERP_H__
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class foo_interpolate
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{
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public:
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foo_interpolate() {}
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virtual ~foo_interpolate() {};
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virtual void reset() = 0;
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long lrate;
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virtual void rate(double rate)
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{
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lrate = (int)(32768. * rate);
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};
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virtual void push(int sample) = 0;
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virtual int pop() = 0;
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};
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extern foo_interpolate * get_filter(int which);
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/*
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// complicated, synced interface, specific to this implementation
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double calc_rate(int timer);
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void interp_switch(int which);
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void interp_reset(int ch);
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inline void interp_push(int ch, int sample);
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inline int interp_pop(int ch, double rate); */
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#endif
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