137 lines
3.4 KiB
C
137 lines
3.4 KiB
C
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/*
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* Resampler.h
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* -----------
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* Purpose: Holds the tables for all available resamplers.
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* Notes : (currently none)
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* Authors: OpenMPT Devs
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* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
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*/
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#pragma once
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#include "BuildSettings.h"
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#include "WindowedFIR.h"
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#include "Mixer.h"
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#include "MixerSettings.h"
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#include "Paula.h"
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OPENMPT_NAMESPACE_BEGIN
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#ifdef LIBOPENMPT_BUILD
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// All these optimizations are not applicable to the tracker
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// because cutoff and firtype are configurable there.
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// Cache resampler tables across resampler object creation.
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// A C++11-style function-static singleton is holding the cached values.
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#define MPT_RESAMPLER_TABLES_CACHED
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// Prime the tables cache when the library is loaded.
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// Caching gets triggered via a global object that primes the cache during
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// construction.
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// This is only really useful with MPT_RESAMPLER_TABLES_CACHED.
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#define MPT_RESAMPLER_TABLES_CACHED_ONSTARTUP
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#endif // LIBOPENMPT_BUILD
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#define SINC_WIDTH 8
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#define SINC_PHASES_BITS 12
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#define SINC_PHASES (1<<SINC_PHASES_BITS)
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#ifdef MPT_INTMIXER
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typedef int16 SINC_TYPE;
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#define SINC_QUANTSHIFT 15
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#else
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typedef mixsample_t SINC_TYPE;
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#endif // MPT_INTMIXER
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#define SINC_MASK (SINC_PHASES-1)
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static_assert((SINC_MASK & 0xffff) == SINC_MASK); // exceeding fractional freq
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class CResamplerSettings
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{
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public:
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ResamplingMode SrcMode = Resampling::Default();
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double gdWFIRCutoff = 0.97;
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uint8 gbWFIRType = WFIR_KAISER4T;
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Resampling::AmigaFilter emulateAmiga = Resampling::AmigaFilter::Off;
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public:
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constexpr CResamplerSettings() = default;
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bool operator == (const CResamplerSettings &cmp) const
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{
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return SrcMode == cmp.SrcMode && gdWFIRCutoff == cmp.gdWFIRCutoff && gbWFIRType == cmp.gbWFIRType && emulateAmiga == cmp.emulateAmiga;
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}
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bool operator != (const CResamplerSettings &cmp) const { return !(*this == cmp); }
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};
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class CResampler
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{
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public:
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CResamplerSettings m_Settings;
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CWindowedFIR m_WindowedFIR;
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static const int16 FastSincTable[256 * 4];
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#ifdef MODPLUG_TRACKER
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static bool StaticTablesInitialized;
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#define RESAMPLER_TABLE static
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#else
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// no global data which has to be initialized by hand in the library
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#define RESAMPLER_TABLE
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#endif // MODPLUG_TRACKER
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RESAMPLER_TABLE SINC_TYPE gKaiserSinc[SINC_PHASES * 8]; // Upsampling
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RESAMPLER_TABLE SINC_TYPE gDownsample13x[SINC_PHASES * 8]; // Downsample 1.333x
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RESAMPLER_TABLE SINC_TYPE gDownsample2x[SINC_PHASES * 8]; // Downsample 2x
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RESAMPLER_TABLE Paula::BlepTables blepTables; // Amiga BLEP resampler
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#ifndef MPT_INTMIXER
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RESAMPLER_TABLE mixsample_t FastSincTablef[256 * 4]; // Cubic spline LUT
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RESAMPLER_TABLE mixsample_t LinearTablef[256]; // Linear interpolation LUT
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#endif // !defined(MPT_INTMIXER)
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#undef RESAMPLER_TABLE
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private:
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CResamplerSettings m_OldSettings;
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public:
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CResampler(bool fresh_generate=false)
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{
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if(fresh_generate)
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{
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InitializeTablesFromScratch(true);
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} else
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{
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InitializeTables();
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}
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}
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void InitializeTables()
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{
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#if defined(MPT_RESAMPLER_TABLES_CACHED)
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InitializeTablesFromCache();
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#else
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InitializeTablesFromScratch(true);
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#endif
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}
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void UpdateTables()
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{
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InitializeTablesFromScratch(false);
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}
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private:
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void InitFloatmixerTables();
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void InitializeTablesFromScratch(bool force=false);
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#ifdef MPT_RESAMPLER_TABLES_CACHED
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void InitializeTablesFromCache();
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#endif
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};
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OPENMPT_NAMESPACE_END
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