engines/gig/Synthesizer.h

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
 *   Copyright (C) 2005 Christian Schoenebeck                              *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the Free Software           *
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,                 *
 *   MA  02111-1307  USA                                                   *
 ***************************************************************************/

#ifndef __LS_GIG_SYNTHESIZER_H__
#define __LS_GIG_SYNTHESIZER_H__

#include "../../common/global.h"
#include "../../common/RTMath.h"
#include "../common/Resampler.h"
#include "../common/BiquadFilter.h"
#include "Filter.h"
#include "SynthesisParam.h"

#define SYNTHESIS_MODE_SET_INTERPOLATE(iMode,bVal)      if (bVal) iMode |= 0x01; else iMode &= ~0x01   /* (un)set mode bit 0 */
#define SYNTHESIS_MODE_SET_FILTER(iMode,bVal)           if (bVal) iMode |= 0x02; else iMode &= ~0x02   /* (un)set mode bit 1 */
#define SYNTHESIS_MODE_SET_LOOP(iMode,bVal)             if (bVal) iMode |= 0x04; else iMode &= ~0x04   /* (un)set mode bit 2 */
#define SYNTHESIS_MODE_SET_CHANNELS(iMode,bVal)         if (bVal) iMode |= 0x08; else iMode &= ~0x08   /* (un)set mode bit 3 */
#define SYNTHESIS_MODE_SET_IMPLEMENTATION(iMode,bVal)   if (bVal) iMode |= 0x10; else iMode &= ~0x10   /* (un)set mode bit 4 */
#define SYNTHESIS_MODE_SET_PROFILING(iMode,bVal)        if (bVal) iMode |= 0x20; else iMode &= ~0x20   /* (un)set mode bit 5 */

#define SYNTHESIS_MODE_GET_INTERPOLATE(iMode)           iMode & 0x01
#define SYNTHESIS_MODE_GET_FILTER(iMode)                iMode & 0x02
#define SYNTHESIS_MODE_GET_LOOP(iMode)                  iMode & 0x04
#define SYNTHESIS_MODE_GET_CHANNELS(iMode)              iMode & 0x08
#define SYNTHESIS_MODE_GET_IMPLEMENTATION(iMode)        iMode & 0x10

namespace LinuxSampler { namespace gig {

    typedef void SynthesizeFragment_Fn(SynthesisParam* pFinalParam, Loop* pLoop);

    void* GetSynthesisFunction(const int SynthesisMode);
    void RunSynthesisFunction(const int SynthesisMode, SynthesisParam* pFinalParam, Loop* pLoop);

    enum channels_t {
        MONO,
        STEREO
    };

    /** @brief Main Synthesis algorithms for the gig::Engine
     *
     * Implementation of the main synthesis algorithms of the Gigasampler
     * format capable sampler engine. This means resampling / interpolation
     * for pitching the audio signal, looping, filter and amplification.
     */
    template<channels_t CHANNELS, bool DOLOOP, bool USEFILTER, bool INTERPOLATE>
    class Synthesizer : public __RTMath<CPP>, public LinuxSampler::Resampler<INTERPOLATE> {

            // declarations of derived functions (see "Name lookup,
            // templates, and accessing members of base classes" in
            // the gcc manual for an explanation of why this is
            // needed).
            //using LinuxSampler::Resampler<INTERPOLATE>::GetNextSampleMonoCPP;
            //using LinuxSampler::Resampler<INTERPOLATE>::GetNextSampleStereoCPP;
            using LinuxSampler::Resampler<INTERPOLATE>::Interpolate1StepMonoCPP;
            using LinuxSampler::Resampler<INTERPOLATE>::Interpolate1StepStereoCPP;

        public:
        //protected:

            static void SynthesizeSubFragment(SynthesisParam* pFinalParam, Loop* pLoop) {
                if (DOLOOP) {
                    const float fLoopEnd   = Float(pLoop->uiEnd);
                    const float fLoopStart = Float(pLoop->uiStart);
                    const float fLoopSize  = Float(pLoop->uiSize);
                    if (pLoop->uiTotalCycles) {
                        // render loop (loop count limited)
                        for (; pFinalParam->uiToGo > 0 && pLoop->uiCyclesLeft; pLoop->uiCyclesLeft -= WrapLoop(fLoopStart, fLoopSize, fLoopEnd, &pFinalParam->dPos)) {
                            const uint uiToGo = Min(pFinalParam->uiToGo, DiffToLoopEnd(fLoopEnd, &pFinalParam->dPos, pFinalParam->fFinalPitch) + 1); //TODO: instead of +1 we could also round up
                            SynthesizeSubSubFragment(pFinalParam, uiToGo);
                        }
                        // render on without loop
                        SynthesizeSubSubFragment(pFinalParam, pFinalParam->uiToGo);
                    } else { // render loop (endless loop)
                        for (; pFinalParam->uiToGo > 0; WrapLoop(fLoopStart, fLoopSize, fLoopEnd, &pFinalParam->dPos)) {
                            const uint uiToGo = Min(pFinalParam->uiToGo, DiffToLoopEnd(fLoopEnd, &pFinalParam->dPos, pFinalParam->fFinalPitch) + 1); //TODO: instead of +1 we could also round up
                            SynthesizeSubSubFragment(pFinalParam, uiToGo);
                        }
                    }
                } else { // no looping
                    SynthesizeSubSubFragment(pFinalParam, pFinalParam->uiToGo);
                }
            }

            /**
             * Returns the difference to the sample's loop end.
             */
            inline static int DiffToLoopEnd(const float& LoopEnd, const void* Pos, const float& Pitch) {
                return uint((LoopEnd - *((double *)Pos)) / Pitch);
            }

#if 0
            //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
            inline static int WrapLoop(const int& LoopStart, const int& LoopSize, const int& LoopEnd, int& Pos) {
                //TODO: we can easily eliminate the branch here
                if (Pos < LoopEnd) return 0;
                Pos = (Pos - LoopEnd) % LoopSize + LoopStart;
                return 1;
            }
#endif

            /**
             * This method handles looping of the RAM playback part of the
             * sample, thus repositioning the playback position once the
             * loop limit was reached. Note: looping of the disk streaming
             * part is handled by libgig (ReadAndLoop() method which will
             * be called by the DiskThread).
             */
            inline static int WrapLoop(const float& LoopStart, const float& LoopSize, const float& LoopEnd, void* vPos) {
                double * Pos = (double *)vPos;
                if (*Pos < LoopEnd) return 0;
                *Pos = fmod(*Pos - LoopEnd, LoopSize) + LoopStart;
                return 1;
            }

            static void SynthesizeSubSubFragment(SynthesisParam* pFinalParam, uint uiToGo) {
                float fVolumeL = pFinalParam->fFinalVolumeLeft;
                float fVolumeR = pFinalParam->fFinalVolumeRight;
                sample_t* pSrc = pFinalParam->pSrc;
                float* pOutL   = pFinalParam->pOutLeft;
                float* pOutR   = pFinalParam->pOutRight;
#ifdef CONFIG_INTERPOLATE_VOLUME
                float fDeltaL  = pFinalParam->fFinalVolumeDeltaLeft;
                float fDeltaR  = pFinalParam->fFinalVolumeDeltaRight;
#endif
                switch (CHANNELS) {
                    case MONO: {
                        float samplePoint;
                        if (INTERPOLATE) {
                            double dPos    = pFinalParam->dPos;
                            float fPitch   = pFinalParam->fFinalPitch;
                            if (USEFILTER) {
                                Filter filterL = pFinalParam->filterLeft;
                                for (int i = 0; i < uiToGo; ++i) {
                                    samplePoint = Interpolate1StepMonoCPP(pSrc, &dPos, fPitch);
                                    samplePoint = filterL.Apply(samplePoint);
#ifdef CONFIG_INTERPOLATE_VOLUME
                                    fVolumeL += fDeltaL;
                                    fVolumeR += fDeltaR;
#endif
                                    pOutL[i] += samplePoint * fVolumeL;
                                    pOutR[i] += samplePoint * fVolumeR;
                                }
                            } else { // no filter needed
                                for (int i = 0; i < uiToGo; ++i) {
                                    samplePoint = Interpolate1StepMonoCPP(pSrc, &dPos, fPitch);
#ifdef CONFIG_INTERPOLATE_VOLUME
                                    fVolumeL += fDeltaL;
                                    fVolumeR += fDeltaR;
#endif
                                    pOutL[i] += samplePoint * fVolumeL;
                                    pOutR[i] += samplePoint * fVolumeR;
                                }
                            }
                            pFinalParam->dPos = dPos;
                        } else { // no interpolation
                            int pos_offset = (int) pFinalParam->dPos;
                            if (USEFILTER) {
                                Filter filterL = pFinalParam->filterLeft;
                                for (int i = 0; i < uiToGo; ++i) {
                                    samplePoint = pSrc[i + pos_offset];
                                    samplePoint = filterL.Apply(samplePoint);
#ifdef CONFIG_INTERPOLATE_VOLUME
                                    fVolumeL += fDeltaL;
                                    fVolumeR += fDeltaR;
#endif
                                    pOutL[i] += samplePoint * fVolumeL;
                                    pOutR[i] += samplePoint * fVolumeR;
                                }
                            } else { // no filter needed
                                for (int i = 0; i < uiToGo; ++i) {
                                    samplePoint = pSrc[i + pos_offset];
#ifdef CONFIG_INTERPOLATE_VOLUME
                                    fVolumeL += fDeltaL;
                                    fVolumeR += fDeltaR;
#endif
                                    pOutL[i] += samplePoint * fVolumeL;
                                    pOutR[i] += samplePoint * fVolumeR;
                                }
                            }
                            pFinalParam->dPos += uiToGo;
                        }
                        break;
                    }
                    case STEREO: {
                        stereo_sample_t samplePoint;
                        if (INTERPOLATE) {
                            double dPos    = pFinalParam->dPos;
                            float fPitch   = pFinalParam->fFinalPitch;
                            if (USEFILTER) {
                                Filter filterL = pFinalParam->filterLeft;
                                Filter filterR = pFinalParam->filterRight;
                                for (int i = 0; i < uiToGo; ++i) {
                                    samplePoint = Interpolate1StepStereoCPP(pSrc, &dPos, fPitch);
                                    samplePoint.left  = filterL.Apply(samplePoint.left);
                                    samplePoint.right = filterR.Apply(samplePoint.right);
#ifdef CONFIG_INTERPOLATE_VOLUME
                                    fVolumeL += fDeltaL;
                                    fVolumeR += fDeltaR;
#endif
                                    pOutL[i] += samplePoint.left  * fVolumeL;
                                    pOutR[i] += samplePoint.right * fVolumeR;
                                }
                            } else { // no filter needed
                                for (int i = 0; i < uiToGo; ++i) {
                                    samplePoint = Interpolate1StepStereoCPP(pSrc, &dPos, fPitch);
#ifdef CONFIG_INTERPOLATE_VOLUME
                                    fVolumeL += fDeltaL;
                                    fVolumeR += fDeltaR;
#endif
                                    pOutL[i] += samplePoint.left  * fVolumeL;
                                    pOutR[i] += samplePoint.right * fVolumeR;
                                }
                            }
                            pFinalParam->dPos = dPos;
                        } else { // no interpolation
                            int pos_offset = ((int) pFinalParam->dPos) << 1;
                            if (USEFILTER) {
                                Filter filterL = pFinalParam->filterLeft;
                                Filter filterR = pFinalParam->filterRight;
                                for (int i = 0, ii = 0; i < uiToGo; ++i, ii+=2) {
                                    samplePoint.left  = pSrc[ii + pos_offset];
                                    samplePoint.right = pSrc[ii + pos_offset + 1];
                                    samplePoint.left  = filterL.Apply(samplePoint.left);
                                    samplePoint.right = filterR.Apply(samplePoint.right);
#ifdef CONFIG_INTERPOLATE_VOLUME
                                    fVolumeL += fDeltaL;
                                    fVolumeR += fDeltaR;
#endif
                                    pOutL[i] += samplePoint.left  * fVolumeL;
                                    pOutR[i] += samplePoint.right * fVolumeR;
                                }
                            } else { // no filter needed
                                for (int i = 0, ii = 0; i < uiToGo; ++i, ii+=2) {
                                    samplePoint.left  = pSrc[ii + pos_offset];
                                    samplePoint.right = pSrc[ii + pos_offset + 1];
#ifdef CONFIG_INTERPOLATE_VOLUME
                                    fVolumeL += fDeltaL;
                                    fVolumeR += fDeltaR;
#endif
                                    pOutL[i] += samplePoint.left  * fVolumeL;
                                    pOutR[i] += samplePoint.right * fVolumeR;
                                }
                            }
                            pFinalParam->dPos += uiToGo;
                        }
                        break;
                    }
                }
                pFinalParam->fFinalVolumeLeft = fVolumeL;
                pFinalParam->fFinalVolumeRight = fVolumeR;
                pFinalParam->pOutRight += uiToGo;
                pFinalParam->pOutLeft  += uiToGo;
                pFinalParam->uiToGo    -= uiToGo;
            }
    };

}} // namespace LinuxSampler::gig

#endif // __LS_GIG_SYNTHESIZER_H__
1	/***************************************************************************
2	* *
3	* LinuxSampler - modular, streaming capable sampler *
4	* *
5	* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	* Copyright (C) 2005 Christian Schoenebeck *
7	* *
8	* This program is free software; you can redistribute it and/or modify *
9	* it under the terms of the GNU General Public License as published by *
10	* the Free Software Foundation; either version 2 of the License, or *
11	* (at your option) any later version. *
12	* *
13	* This program is distributed in the hope that it will be useful, *
14	* but WITHOUT ANY WARRANTY; without even the implied warranty of *
15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16	* GNU General Public License for more details. *
17	* *
18	* You should have received a copy of the GNU General Public License *
19	* along with this program; if not, write to the Free Software *
20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
21	* MA 02111-1307 USA *
22	***************************************************************************/
23
24	#ifndef __LS_GIG_SYNTHESIZER_H__
25	#define __LS_GIG_SYNTHESIZER_H__
26
27	#include "../../common/global.h"
28	#include "../../common/RTMath.h"
29	#include "../common/Resampler.h"
30	#include "../common/BiquadFilter.h"
31	#include "Filter.h"
32	#include "SynthesisParam.h"
33
34	#define SYNTHESIS_MODE_SET_INTERPOLATE(iMode,bVal) if (bVal) iMode \|= 0x01; else iMode &= ~0x01 /* (un)set mode bit 0 */
35	#define SYNTHESIS_MODE_SET_FILTER(iMode,bVal) if (bVal) iMode \|= 0x02; else iMode &= ~0x02 /* (un)set mode bit 1 */
36	#define SYNTHESIS_MODE_SET_LOOP(iMode,bVal) if (bVal) iMode \|= 0x04; else iMode &= ~0x04 /* (un)set mode bit 2 */
37	#define SYNTHESIS_MODE_SET_CHANNELS(iMode,bVal) if (bVal) iMode \|= 0x08; else iMode &= ~0x08 /* (un)set mode bit 3 */
38	#define SYNTHESIS_MODE_SET_IMPLEMENTATION(iMode,bVal) if (bVal) iMode \|= 0x10; else iMode &= ~0x10 /* (un)set mode bit 4 */
39	#define SYNTHESIS_MODE_SET_PROFILING(iMode,bVal) if (bVal) iMode \|= 0x20; else iMode &= ~0x20 /* (un)set mode bit 5 */
40
41	#define SYNTHESIS_MODE_GET_INTERPOLATE(iMode) iMode & 0x01
42	#define SYNTHESIS_MODE_GET_FILTER(iMode) iMode & 0x02
43	#define SYNTHESIS_MODE_GET_LOOP(iMode) iMode & 0x04
44	#define SYNTHESIS_MODE_GET_CHANNELS(iMode) iMode & 0x08
45	#define SYNTHESIS_MODE_GET_IMPLEMENTATION(iMode) iMode & 0x10
46
47	namespace LinuxSampler { namespace gig {
48
49	typedef void SynthesizeFragment_Fn(SynthesisParam* pFinalParam, Loop* pLoop);
50
51	void* GetSynthesisFunction(const int SynthesisMode);
52	void RunSynthesisFunction(const int SynthesisMode, SynthesisParam* pFinalParam, Loop* pLoop);
53
54	enum channels_t {
55	MONO,
56	STEREO
57	};
58
59	/** @brief Main Synthesis algorithms for the gig::Engine
60	*
61	* Implementation of the main synthesis algorithms of the Gigasampler
62	* format capable sampler engine. This means resampling / interpolation
63	* for pitching the audio signal, looping, filter and amplification.
64	*/
65	template<channels_t CHANNELS, bool DOLOOP, bool USEFILTER, bool INTERPOLATE>
66	class Synthesizer : public __RTMath<CPP>, public LinuxSampler::Resampler<INTERPOLATE> {
67
68	// declarations of derived functions (see "Name lookup,
69	// templates, and accessing members of base classes" in
70	// the gcc manual for an explanation of why this is
71	// needed).
72	//using LinuxSampler::Resampler<INTERPOLATE>::GetNextSampleMonoCPP;
73	//using LinuxSampler::Resampler<INTERPOLATE>::GetNextSampleStereoCPP;
74	using LinuxSampler::Resampler<INTERPOLATE>::Interpolate1StepMonoCPP;
75	using LinuxSampler::Resampler<INTERPOLATE>::Interpolate1StepStereoCPP;
76
77	public:
78	//protected:
79
80	static void SynthesizeSubFragment(SynthesisParam* pFinalParam, Loop* pLoop) {
81	if (DOLOOP) {
82	const float fLoopEnd = Float(pLoop->uiEnd);
83	const float fLoopStart = Float(pLoop->uiStart);
84	const float fLoopSize = Float(pLoop->uiSize);
85	if (pLoop->uiTotalCycles) {
86	// render loop (loop count limited)
87	for (; pFinalParam->uiToGo > 0 && pLoop->uiCyclesLeft; pLoop->uiCyclesLeft -= WrapLoop(fLoopStart, fLoopSize, fLoopEnd, &pFinalParam->dPos)) {
88	const uint uiToGo = Min(pFinalParam->uiToGo, DiffToLoopEnd(fLoopEnd, &pFinalParam->dPos, pFinalParam->fFinalPitch) + 1); //TODO: instead of +1 we could also round up
89	SynthesizeSubSubFragment(pFinalParam, uiToGo);
90	}
91	// render on without loop
92	SynthesizeSubSubFragment(pFinalParam, pFinalParam->uiToGo);
93	} else { // render loop (endless loop)
94	for (; pFinalParam->uiToGo > 0; WrapLoop(fLoopStart, fLoopSize, fLoopEnd, &pFinalParam->dPos)) {
95	const uint uiToGo = Min(pFinalParam->uiToGo, DiffToLoopEnd(fLoopEnd, &pFinalParam->dPos, pFinalParam->fFinalPitch) + 1); //TODO: instead of +1 we could also round up
96	SynthesizeSubSubFragment(pFinalParam, uiToGo);
97	}
98	}
99	} else { // no looping
100	SynthesizeSubSubFragment(pFinalParam, pFinalParam->uiToGo);
101	}
102	}
103
104	/**
105	* Returns the difference to the sample's loop end.
106	*/
107	inline static int DiffToLoopEnd(const float& LoopEnd, const void* Pos, const float& Pitch) {
108	return uint((LoopEnd - ((double )Pos)) / Pitch);
109	}
110
111	#if 0
112	//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
113	inline static int WrapLoop(const int& LoopStart, const int& LoopSize, const int& LoopEnd, int& Pos) {
114	//TODO: we can easily eliminate the branch here
115	if (Pos < LoopEnd) return 0;
116	Pos = (Pos - LoopEnd) % LoopSize + LoopStart;
117	return 1;
118	}
119	#endif
120
121	/**
122	* This method handles looping of the RAM playback part of the
123	* sample, thus repositioning the playback position once the
124	* loop limit was reached. Note: looping of the disk streaming
125	* part is handled by libgig (ReadAndLoop() method which will
126	* be called by the DiskThread).
127	*/
128	inline static int WrapLoop(const float& LoopStart, const float& LoopSize, const float& LoopEnd, void* vPos) {
129	double * Pos = (double *)vPos;
130	if (*Pos < LoopEnd) return 0;
131	Pos = fmod(Pos - LoopEnd, LoopSize) + LoopStart;
132	return 1;
133	}
134
135	static void SynthesizeSubSubFragment(SynthesisParam* pFinalParam, uint uiToGo) {
136	float fVolumeL = pFinalParam->fFinalVolumeLeft;
137	float fVolumeR = pFinalParam->fFinalVolumeRight;
138	sample_t* pSrc = pFinalParam->pSrc;
139	float* pOutL = pFinalParam->pOutLeft;
140	float* pOutR = pFinalParam->pOutRight;
141	#ifdef CONFIG_INTERPOLATE_VOLUME
142	float fDeltaL = pFinalParam->fFinalVolumeDeltaLeft;
143	float fDeltaR = pFinalParam->fFinalVolumeDeltaRight;
144	#endif
145	switch (CHANNELS) {
146	case MONO: {
147	float samplePoint;
148	if (INTERPOLATE) {
149	double dPos = pFinalParam->dPos;
150	float fPitch = pFinalParam->fFinalPitch;
151	if (USEFILTER) {
152	Filter filterL = pFinalParam->filterLeft;
153	for (int i = 0; i < uiToGo; ++i) {
154	samplePoint = Interpolate1StepMonoCPP(pSrc, &dPos, fPitch);
155	samplePoint = filterL.Apply(samplePoint);
156	#ifdef CONFIG_INTERPOLATE_VOLUME
157	fVolumeL += fDeltaL;
158	fVolumeR += fDeltaR;
159	#endif
160	pOutL[i] += samplePoint * fVolumeL;
161	pOutR[i] += samplePoint * fVolumeR;
162	}
163	} else { // no filter needed
164	for (int i = 0; i < uiToGo; ++i) {
165	samplePoint = Interpolate1StepMonoCPP(pSrc, &dPos, fPitch);
166	#ifdef CONFIG_INTERPOLATE_VOLUME
167	fVolumeL += fDeltaL;
168	fVolumeR += fDeltaR;
169	#endif
170	pOutL[i] += samplePoint * fVolumeL;
171	pOutR[i] += samplePoint * fVolumeR;
172	}
173	}
174	pFinalParam->dPos = dPos;
175	} else { // no interpolation
176	int pos_offset = (int) pFinalParam->dPos;
177	if (USEFILTER) {
178	Filter filterL = pFinalParam->filterLeft;
179	for (int i = 0; i < uiToGo; ++i) {
180	samplePoint = pSrc[i + pos_offset];
181	samplePoint = filterL.Apply(samplePoint);
182	#ifdef CONFIG_INTERPOLATE_VOLUME
183	fVolumeL += fDeltaL;
184	fVolumeR += fDeltaR;
185	#endif
186	pOutL[i] += samplePoint * fVolumeL;
187	pOutR[i] += samplePoint * fVolumeR;
188	}
189	} else { // no filter needed
190	for (int i = 0; i < uiToGo; ++i) {
191	samplePoint = pSrc[i + pos_offset];
192	#ifdef CONFIG_INTERPOLATE_VOLUME
193	fVolumeL += fDeltaL;
194	fVolumeR += fDeltaR;
195	#endif
196	pOutL[i] += samplePoint * fVolumeL;
197	pOutR[i] += samplePoint * fVolumeR;
198	}
199	}
200	pFinalParam->dPos += uiToGo;
201	}
202	break;
203	}
204	case STEREO: {
205	stereo_sample_t samplePoint;
206	if (INTERPOLATE) {
207	double dPos = pFinalParam->dPos;
208	float fPitch = pFinalParam->fFinalPitch;
209	if (USEFILTER) {
210	Filter filterL = pFinalParam->filterLeft;
211	Filter filterR = pFinalParam->filterRight;
212	for (int i = 0; i < uiToGo; ++i) {
213	samplePoint = Interpolate1StepStereoCPP(pSrc, &dPos, fPitch);
214	samplePoint.left = filterL.Apply(samplePoint.left);
215	samplePoint.right = filterR.Apply(samplePoint.right);
216	#ifdef CONFIG_INTERPOLATE_VOLUME
217	fVolumeL += fDeltaL;
218	fVolumeR += fDeltaR;
219	#endif
220	pOutL[i] += samplePoint.left * fVolumeL;
221	pOutR[i] += samplePoint.right * fVolumeR;
222	}
223	} else { // no filter needed
224	for (int i = 0; i < uiToGo; ++i) {
225	samplePoint = Interpolate1StepStereoCPP(pSrc, &dPos, fPitch);
226	#ifdef CONFIG_INTERPOLATE_VOLUME
227	fVolumeL += fDeltaL;
228	fVolumeR += fDeltaR;
229	#endif
230	pOutL[i] += samplePoint.left * fVolumeL;
231	pOutR[i] += samplePoint.right * fVolumeR;
232	}
233	}
234	pFinalParam->dPos = dPos;
235	} else { // no interpolation
236	int pos_offset = ((int) pFinalParam->dPos) << 1;
237	if (USEFILTER) {
238	Filter filterL = pFinalParam->filterLeft;
239	Filter filterR = pFinalParam->filterRight;
240	for (int i = 0, ii = 0; i < uiToGo; ++i, ii+=2) {
241	samplePoint.left = pSrc[ii + pos_offset];
242	samplePoint.right = pSrc[ii + pos_offset + 1];
243	samplePoint.left = filterL.Apply(samplePoint.left);
244	samplePoint.right = filterR.Apply(samplePoint.right);
245	#ifdef CONFIG_INTERPOLATE_VOLUME
246	fVolumeL += fDeltaL;
247	fVolumeR += fDeltaR;
248	#endif
249	pOutL[i] += samplePoint.left * fVolumeL;
250	pOutR[i] += samplePoint.right * fVolumeR;
251	}
252	} else { // no filter needed
253	for (int i = 0, ii = 0; i < uiToGo; ++i, ii+=2) {
254	samplePoint.left = pSrc[ii + pos_offset];
255	samplePoint.right = pSrc[ii + pos_offset + 1];
256	#ifdef CONFIG_INTERPOLATE_VOLUME
257	fVolumeL += fDeltaL;
258	fVolumeR += fDeltaR;
259	#endif
260	pOutL[i] += samplePoint.left * fVolumeL;
261	pOutR[i] += samplePoint.right * fVolumeR;
262	}
263	}
264	pFinalParam->dPos += uiToGo;
265	}
266	break;
267	}
268	}
269	pFinalParam->fFinalVolumeLeft = fVolumeL;
270	pFinalParam->fFinalVolumeRight = fVolumeR;
271	pFinalParam->pOutRight += uiToGo;
272	pFinalParam->pOutLeft += uiToGo;
273	pFinalParam->uiToGo -= uiToGo;
274	}
275	};
276
277	}} // namespace LinuxSampler::gig
278
279	#endif // __LS_GIG_SYNTHESIZER_H__