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/*************************************************************************** |
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* * |
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* LinuxSampler - modular, streaming capable sampler * |
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* * |
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* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck * |
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* Copyright (C) 2005 - 2007 Christian Schoenebeck * |
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* * |
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* This program is free software; you can redistribute it and/or modify * |
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* it under the terms of the GNU General Public License as published by * |
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* the Free Software Foundation; either version 2 of the License, or * |
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* (at your option) any later version. * |
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* * |
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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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* * |
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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, * |
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* MA 02111-1307 USA * |
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***************************************************************************/ |
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|
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#ifndef __LS_GIG_SYNTHESIZER_H__ |
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#define __LS_GIG_SYNTHESIZER_H__ |
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|
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#include "../../common/global_private.h" |
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#include "../../common/RTMath.h" |
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#include "../common/Resampler.h" |
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#include "Filter.h" |
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#include "SynthesisParam.h" |
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|
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#define SYNTHESIS_MODE_SET_INTERPOLATE(iMode,bVal) if (bVal) iMode |= 0x01; else iMode &= ~0x01 /* (un)set mode bit 0 */ |
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#define SYNTHESIS_MODE_SET_FILTER(iMode,bVal) if (bVal) iMode |= 0x02; else iMode &= ~0x02 /* (un)set mode bit 1 */ |
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#define SYNTHESIS_MODE_SET_LOOP(iMode,bVal) if (bVal) iMode |= 0x04; else iMode &= ~0x04 /* (un)set mode bit 2 */ |
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#define SYNTHESIS_MODE_SET_CHANNELS(iMode,bVal) if (bVal) iMode |= 0x08; else iMode &= ~0x08 /* (un)set mode bit 3 */ |
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#define SYNTHESIS_MODE_SET_BITDEPTH24(iMode,bVal) if (bVal) iMode |= 0x10; else iMode &= ~0x10 /* (un)set mode bit 4 */ |
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#define SYNTHESIS_MODE_SET_IMPLEMENTATION(iMode,bVal) if (bVal) iMode |= 0x20; else iMode &= ~0x20 /* (un)set mode bit 5 */ |
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#define SYNTHESIS_MODE_SET_PROFILING(iMode,bVal) if (bVal) iMode |= 0x40; else iMode &= ~0x40 /* (un)set mode bit 6 */ |
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|
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#define SYNTHESIS_MODE_GET_INTERPOLATE(iMode) iMode & 0x01 |
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#define SYNTHESIS_MODE_GET_FILTER(iMode) iMode & 0x02 |
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#define SYNTHESIS_MODE_GET_LOOP(iMode) iMode & 0x04 |
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#define SYNTHESIS_MODE_GET_CHANNELS(iMode) iMode & 0x08 |
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#define SYNTHESIS_MODE_GET_BITDEPTH24(iMode) iMode & 0x10 |
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#define SYNTHESIS_MODE_GET_IMPLEMENTATION(iMode) iMode & 0x20 |
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|
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|
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namespace LinuxSampler { namespace gig { |
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|
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typedef void SynthesizeFragment_Fn(SynthesisParam* pFinalParam, Loop* pLoop); |
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|
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void* GetSynthesisFunction(const int SynthesisMode); |
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void RunSynthesisFunction(const int SynthesisMode, SynthesisParam* pFinalParam, Loop* pLoop); |
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|
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enum channels_t { |
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MONO, |
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STEREO |
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}; |
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|
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/** @brief Main Synthesis algorithms for the gig::Engine |
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* |
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* Implementation of the main synthesis algorithms of the Gigasampler |
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* format capable sampler engine. This means resampling / interpolation |
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* for pitching the audio signal, looping, filter and amplification. |
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*/ |
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template<channels_t CHANNELS, bool DOLOOP, bool USEFILTER, bool INTERPOLATE, bool BITDEPTH24> |
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class Synthesizer : public __RTMath<CPP>, public LinuxSampler::Resampler<INTERPOLATE,BITDEPTH24> { |
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|
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// declarations of derived functions (see "Name lookup, |
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// templates, and accessing members of base classes" in |
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// the gcc manual for an explanation of why this is |
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// needed). |
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//using LinuxSampler::Resampler<INTERPOLATE>::GetNextSampleMonoCPP; |
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//using LinuxSampler::Resampler<INTERPOLATE>::GetNextSampleStereoCPP; |
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using LinuxSampler::Resampler<INTERPOLATE,BITDEPTH24>::Interpolate1StepMonoCPP; |
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using LinuxSampler::Resampler<INTERPOLATE,BITDEPTH24>::Interpolate1StepStereoCPP; |
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|
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public: |
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//protected: |
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|
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static void SynthesizeSubFragment(SynthesisParam* pFinalParam, Loop* pLoop) { |
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if (DOLOOP) { |
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const float fLoopEnd = Float(pLoop->uiEnd); |
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const float fLoopStart = Float(pLoop->uiStart); |
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const float fLoopSize = Float(pLoop->uiSize); |
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if (pLoop->uiTotalCycles) { |
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// render loop (loop count limited) |
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for (; pFinalParam->uiToGo > 0 && pLoop->uiCyclesLeft; pLoop->uiCyclesLeft -= WrapLoop(fLoopStart, fLoopSize, fLoopEnd, &pFinalParam->dPos)) { |
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const uint uiToGo = Min(pFinalParam->uiToGo, DiffToLoopEnd(fLoopEnd, &pFinalParam->dPos, pFinalParam->fFinalPitch) + 1); //TODO: instead of +1 we could also round up |
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SynthesizeSubSubFragment(pFinalParam, uiToGo); |
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} |
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// render on without loop |
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SynthesizeSubSubFragment(pFinalParam, pFinalParam->uiToGo); |
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} else { // render loop (endless loop) |
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for (; pFinalParam->uiToGo > 0; WrapLoop(fLoopStart, fLoopSize, fLoopEnd, &pFinalParam->dPos)) { |
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const uint uiToGo = Min(pFinalParam->uiToGo, DiffToLoopEnd(fLoopEnd, &pFinalParam->dPos, pFinalParam->fFinalPitch) + 1); //TODO: instead of +1 we could also round up |
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SynthesizeSubSubFragment(pFinalParam, uiToGo); |
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} |
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} |
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} else { // no looping |
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SynthesizeSubSubFragment(pFinalParam, pFinalParam->uiToGo); |
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} |
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} |
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|
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/** |
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* Returns the difference to the sample's loop end. |
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*/ |
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inline static int DiffToLoopEnd(const float& LoopEnd, const void* Pos, const float& Pitch) { |
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return uint((LoopEnd - *((double *)Pos)) / Pitch); |
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} |
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|
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#if 0 |
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//TODO: this method is not in use yet, it's intended to be used for pitch=x.0f where we could use integer instead of float as playback position variable |
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inline static int WrapLoop(const int& LoopStart, const int& LoopSize, const int& LoopEnd, int& Pos) { |
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//TODO: we can easily eliminate the branch here |
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if (Pos < LoopEnd) return 0; |
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Pos = (Pos - LoopEnd) % LoopSize + LoopStart; |
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return 1; |
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} |
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#endif |
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|
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/** |
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* This method handles looping of the RAM playback part of the |
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* sample, thus repositioning the playback position once the |
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* loop limit was reached. Note: looping of the disk streaming |
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* part is handled by libgig (ReadAndLoop() method which will |
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* be called by the DiskThread). |
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*/ |
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inline static int WrapLoop(const float& LoopStart, const float& LoopSize, const float& LoopEnd, void* vPos) { |
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double * Pos = (double *)vPos; |
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if (*Pos < LoopEnd) return 0; |
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*Pos = fmod(*Pos - LoopEnd, LoopSize) + LoopStart; |
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return 1; |
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} |
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|
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inline static int32_t getSample(sample_t* src, int pos) { |
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if (BITDEPTH24) { |
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pos *= 3; |
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#if WORDS_BIGENDIAN |
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unsigned char* p = (unsigned char*)src; |
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return p[pos] << 8 | p[pos + 1] << 16 | p[pos + 2] << 24; |
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#else |
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// 24bit read optimization: |
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// a misaligned 32bit read and subquent 8 bit shift is faster (on x86) than reading 3 single bytes and shifting them |
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return (*((int32_t *)(&((char *)(src))[pos])))<<8; |
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#endif |
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} else { |
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return src[pos]; |
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} |
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} |
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|
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static void SynthesizeSubSubFragment(SynthesisParam* pFinalParam, uint uiToGo) { |
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float fVolumeL = pFinalParam->fFinalVolumeLeft; |
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float fVolumeR = pFinalParam->fFinalVolumeRight; |
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sample_t* pSrc = pFinalParam->pSrc; |
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float* pOutL = pFinalParam->pOutLeft; |
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float* pOutR = pFinalParam->pOutRight; |
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#ifdef CONFIG_INTERPOLATE_VOLUME |
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float fDeltaL = pFinalParam->fFinalVolumeDeltaLeft; |
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float fDeltaR = pFinalParam->fFinalVolumeDeltaRight; |
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#endif |
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switch (CHANNELS) { |
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case MONO: { |
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float samplePoint; |
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if (INTERPOLATE) { |
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double dPos = pFinalParam->dPos; |
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float fPitch = pFinalParam->fFinalPitch; |
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if (USEFILTER) { |
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Filter filterL = pFinalParam->filterLeft; |
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for (int i = 0; i < uiToGo; ++i) { |
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samplePoint = Interpolate1StepMonoCPP(pSrc, &dPos, fPitch); |
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samplePoint = filterL.Apply(samplePoint); |
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#ifdef CONFIG_INTERPOLATE_VOLUME |
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fVolumeL += fDeltaL; |
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fVolumeR += fDeltaR; |
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#endif |
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pOutL[i] += samplePoint * fVolumeL; |
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pOutR[i] += samplePoint * fVolumeR; |
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} |
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} else { // no filter needed |
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for (int i = 0; i < uiToGo; ++i) { |
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samplePoint = Interpolate1StepMonoCPP(pSrc, &dPos, fPitch); |
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#ifdef CONFIG_INTERPOLATE_VOLUME |
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fVolumeL += fDeltaL; |
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fVolumeR += fDeltaR; |
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#endif |
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pOutL[i] += samplePoint * fVolumeL; |
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pOutR[i] += samplePoint * fVolumeR; |
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} |
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} |
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pFinalParam->dPos = dPos; |
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} else { // no interpolation |
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int pos_offset = (int) pFinalParam->dPos; |
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if (USEFILTER) { |
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Filter filterL = pFinalParam->filterLeft; |
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for (int i = 0; i < uiToGo; ++i) { |
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samplePoint = getSample(pSrc, i + pos_offset); |
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samplePoint = filterL.Apply(samplePoint); |
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#ifdef CONFIG_INTERPOLATE_VOLUME |
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fVolumeL += fDeltaL; |
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fVolumeR += fDeltaR; |
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#endif |
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pOutL[i] += samplePoint * fVolumeL; |
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pOutR[i] += samplePoint * fVolumeR; |
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} |
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} else { // no filter needed |
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for (int i = 0; i < uiToGo; ++i) { |
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samplePoint = getSample(pSrc, i + pos_offset); |
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#ifdef CONFIG_INTERPOLATE_VOLUME |
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fVolumeL += fDeltaL; |
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fVolumeR += fDeltaR; |
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#endif |
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pOutL[i] += samplePoint * fVolumeL; |
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pOutR[i] += samplePoint * fVolumeR; |
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} |
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} |
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pFinalParam->dPos += uiToGo; |
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} |
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break; |
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} |
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case STEREO: { |
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stereo_sample_t samplePoint; |
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if (INTERPOLATE) { |
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double dPos = pFinalParam->dPos; |
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float fPitch = pFinalParam->fFinalPitch; |
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if (USEFILTER) { |
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Filter filterL = pFinalParam->filterLeft; |
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Filter filterR = pFinalParam->filterRight; |
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for (int i = 0; i < uiToGo; ++i) { |
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samplePoint = Interpolate1StepStereoCPP(pSrc, &dPos, fPitch); |
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samplePoint.left = filterL.Apply(samplePoint.left); |
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samplePoint.right = filterR.Apply(samplePoint.right); |
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#ifdef CONFIG_INTERPOLATE_VOLUME |
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fVolumeL += fDeltaL; |
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fVolumeR += fDeltaR; |
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#endif |
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pOutL[i] += samplePoint.left * fVolumeL; |
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pOutR[i] += samplePoint.right * fVolumeR; |
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} |
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} else { // no filter needed |
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for (int i = 0; i < uiToGo; ++i) { |
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samplePoint = Interpolate1StepStereoCPP(pSrc, &dPos, fPitch); |
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#ifdef CONFIG_INTERPOLATE_VOLUME |
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fVolumeL += fDeltaL; |
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fVolumeR += fDeltaR; |
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#endif |
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pOutL[i] += samplePoint.left * fVolumeL; |
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pOutR[i] += samplePoint.right * fVolumeR; |
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} |
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} |
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pFinalParam->dPos = dPos; |
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} else { // no interpolation |
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int pos_offset = ((int) pFinalParam->dPos) << 1; |
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if (USEFILTER) { |
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Filter filterL = pFinalParam->filterLeft; |
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Filter filterR = pFinalParam->filterRight; |
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for (int i = 0, ii = 0; i < uiToGo; ++i, ii+=2) { |
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samplePoint.left = getSample(pSrc, ii + pos_offset); |
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samplePoint.right = getSample(pSrc, ii + pos_offset + 1); |
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samplePoint.left = filterL.Apply(samplePoint.left); |
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samplePoint.right = filterR.Apply(samplePoint.right); |
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#ifdef CONFIG_INTERPOLATE_VOLUME |
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fVolumeL += fDeltaL; |
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fVolumeR += fDeltaR; |
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#endif |
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pOutL[i] += samplePoint.left * fVolumeL; |
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pOutR[i] += samplePoint.right * fVolumeR; |
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} |
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} else { // no filter needed |
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for (int i = 0, ii = 0; i < uiToGo; ++i, ii+=2) { |
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samplePoint.left = getSample(pSrc, ii + pos_offset); |
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samplePoint.right = getSample(pSrc, ii + pos_offset + 1); |
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#ifdef CONFIG_INTERPOLATE_VOLUME |
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fVolumeL += fDeltaL; |
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fVolumeR += fDeltaR; |
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#endif |
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pOutL[i] += samplePoint.left * fVolumeL; |
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pOutR[i] += samplePoint.right * fVolumeR; |
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} |
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} |
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pFinalParam->dPos += uiToGo; |
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} |
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break; |
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} |
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} |
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pFinalParam->fFinalVolumeLeft = fVolumeL; |
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pFinalParam->fFinalVolumeRight = fVolumeR; |
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pFinalParam->pOutRight += uiToGo; |
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pFinalParam->pOutLeft += uiToGo; |
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pFinalParam->uiToGo -= uiToGo; |
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} |
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}; |
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|
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}} // namespace LinuxSampler::gig |
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|
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#endif // __LS_GIG_SYNTHESIZER_H__ |