121 lines
4.2 KiB
C++
121 lines
4.2 KiB
C++
/*
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WDL - resample.h
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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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#ifndef _WDL_RESAMPLE_H_
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#define _WDL_RESAMPLE_H_
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#include <stdlib.h>
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#include <string.h>
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#include "wdltypes.h"
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#include "heapbuf.h"
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// default to floats for sinc filter ceofficients
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#ifdef WDL_RESAMPLE_FULL_SINC_PRECISION
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typedef double WDL_SincFilterSample;
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#else
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typedef float WDL_SincFilterSample;
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#endif
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// default to doubles for audio samples
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#ifdef WDL_RESAMPLE_TYPE
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typedef WDL_RESAMPLE_TYPE WDL_ResampleSample;
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#else
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typedef double WDL_ResampleSample;
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#endif
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#ifndef WDL_RESAMPLE_MAX_FILTERS
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#define WDL_RESAMPLE_MAX_FILTERS 4
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#endif
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#ifndef WDL_RESAMPLE_MAX_NCH
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#define WDL_RESAMPLE_MAX_NCH 64
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#endif
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class WDL_Resampler
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{
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public:
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WDL_Resampler();
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~WDL_Resampler();
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// if sinc set, it overrides interp or filtercnt
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void SetMode(bool interp, int filtercnt, bool sinc, int sinc_size=64, int sinc_interpsize=32);
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void SetFilterParms(float filterpos=0.693, float filterq=0.707) { m_filterpos=filterpos; m_filterq=filterq; } // used for filtercnt>0 but not sinc
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void SetFeedMode(bool wantInputDriven) { m_feedmode=wantInputDriven; } // if true, that means the first parameter to ResamplePrepare will specify however much input you have, not how much you want
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void Reset(double fracpos=0.0);
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void SetRates(double rate_in, double rate_out);
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double GetCurrentLatency(); // amount of input that has been received but not yet converted to output, in seconds
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// req_samples is output samples desired if !wantInputDriven, or if wantInputDriven is input samples that we have
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// returns number of samples desired (put these into *inbuffer)
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// note that it is safe to call ResamplePrepare without calling ResampleOut (the next call of ResamplePrepare will function as normal)
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int ResamplePrepare(int req_samples, int nch, WDL_ResampleSample **inbuffer);
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// if numsamples_in < the value return by ResamplePrepare(), then it will be flushed to produce all remaining valid samples
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// do NOT call with nsamples_in greater than the value returned from resamplerprpare()! the extra samples will be ignored.
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// returns number of samples successfully outputted to out
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int ResampleOut(WDL_ResampleSample *out, int nsamples_in, int nsamples_out, int nch);
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private:
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void BuildLowPass(double filtpos);
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void inline SincSample(WDL_ResampleSample *outptr, const WDL_ResampleSample *inptr, double fracpos, int nch, const WDL_SincFilterSample *filter, int filtsz);
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void inline SincSample1(WDL_ResampleSample *outptr, const WDL_ResampleSample *inptr, double fracpos, const WDL_SincFilterSample *filter, int filtsz);
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void inline SincSample2(WDL_ResampleSample *outptr, const WDL_ResampleSample *inptr, double fracpos, const WDL_SincFilterSample *filter, int filtsz);
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double m_sratein WDL_FIXALIGN;
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double m_srateout;
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double m_fracpos;
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double m_ratio;
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double m_filter_ratio;
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float m_filterq, m_filterpos;
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WDL_TypedBuf<WDL_ResampleSample> m_rsinbuf;
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WDL_TypedBuf<WDL_SincFilterSample> m_filter_coeffs;
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class WDL_Resampler_IIRFilter;
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WDL_Resampler_IIRFilter *m_iirfilter;
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int m_filter_coeffs_size;
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int m_last_requested;
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int m_filtlatency;
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int m_samples_in_rsinbuf;
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int m_lp_oversize;
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int m_sincsize;
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int m_filtercnt;
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int m_sincoversize;
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bool m_interp;
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bool m_feedmode;
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};
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#endif
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