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* LinuxSampler - modular, streaming capable sampler * |
* LinuxSampler - modular, streaming capable sampler * |
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* * |
* * |
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* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck * |
* 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 * |
* 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 * |
* it under the terms of the GNU General Public License as published by * |
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* MA 02111-1307 USA * |
* MA 02111-1307 USA * |
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***************************************************************************/ |
***************************************************************************/ |
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// Note: the assembly code is currently disabled, as it doesn't fit into |
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// the new synthesis core introduced by LS 0.4.0 |
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#ifndef __LS_RESAMPLER_H__ |
#ifndef __LS_RESAMPLER_H__ |
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#define __LS_RESAMPLER_H__ |
#define __LS_RESAMPLER_H__ |
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#include "../../common/global.h" |
#include "../../common/global_private.h" |
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// TODO: cubic interpolation is not yet supported by the MMX/SSE(1) version though |
// TODO: cubic interpolation is not yet supported by the MMX/SSE(1) version though |
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// TODO: cubic interpolation is not supported for 24 bit samples |
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#ifndef USE_LINEAR_INTERPOLATION |
#ifndef USE_LINEAR_INTERPOLATION |
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# define USE_LINEAR_INTERPOLATION 1 ///< set to 0 if you prefer cubic interpolation (slower, better quality) |
# define USE_LINEAR_INTERPOLATION 1 ///< set to 0 if you prefer cubic interpolation (slower, better quality) |
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#endif |
#endif |
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namespace LinuxSampler { |
namespace LinuxSampler { |
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/** @brief Stereo sample point |
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* |
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* Encapsulates one stereo sample point, thus signal value for one |
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* sample point for left and right channel. |
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*/ |
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struct stereo_sample_t { |
struct stereo_sample_t { |
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float left; |
float left; |
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float right; |
float right; |
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}; |
}; |
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template<bool INTERPOLATE> |
/** @brief Resampler Template |
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* |
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* This template provides pure C++ and MMX/SSE assembly implementations |
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* for linear and cubic interpolation for pitching a mono or stereo |
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* input signal. |
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*/ |
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template<bool INTERPOLATE,bool BITDEPTH24> |
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class Resampler { |
class Resampler { |
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public: |
public: |
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inline static float GetNextSampleMonoCPP(sample_t* pSrc, double* Pos, float& Pitch) { |
inline static float GetNextSampleMonoCPP(sample_t* pSrc, double* Pos, float& Pitch) { |
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} |
} |
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} |
} |
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#if 0 // CONFIG_ASM && ARCH_X86 |
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inline static void GetNext4SamplesMonoMMXSSE(sample_t* pSrc, void* Pos, float& Pitch) { |
inline static void GetNext4SamplesMonoMMXSSE(sample_t* pSrc, void* Pos, float& Pitch) { |
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if (INTERPOLATE) Interpolate4StepsMonoMMXSSE(pSrc, Pos, Pitch); |
if (INTERPOLATE) Interpolate4StepsMonoMMXSSE(pSrc, Pos, Pitch); |
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else { // no pitch, so no interpolation necessary |
else { // no pitch, so no interpolation necessary |
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); |
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} |
} |
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} |
} |
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#endif // CONFIG_ASM && ARCH_X86 |
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protected: |
protected: |
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static int getSample(sample_t* src, int pos) { |
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if (BITDEPTH24) { |
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pos *= 3; |
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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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return src[pos]; |
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} |
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} |
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inline static float Interpolate1StepMonoCPP(sample_t* pSrc, double* Pos, float& Pitch) { |
inline static float Interpolate1StepMonoCPP(sample_t* pSrc, double* Pos, float& Pitch) { |
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int pos_int = (int) *Pos; // integer position |
int pos_int = (int) *Pos; // integer position |
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float pos_fract = *Pos - pos_int; // fractional part of position |
float pos_fract = *Pos - pos_int; // fractional part of position |
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#if USE_LINEAR_INTERPOLATION |
#if USE_LINEAR_INTERPOLATION |
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float samplePoint = pSrc[pos_int] + pos_fract * (pSrc[pos_int+1] - pSrc[pos_int]); |
int x1 = getSample(pSrc, pos_int); |
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int x2 = getSample(pSrc, pos_int + 1); |
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float samplePoint = (x1 + pos_fract * (x2 - x1)); |
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#else // polynomial interpolation |
#else // polynomial interpolation |
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float xm1 = pSrc[pos_int]; |
float xm1 = pSrc[pos_int]; |
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float x0 = pSrc[pos_int+1]; |
float x0 = pSrc[pos_int+1]; |
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#if USE_LINEAR_INTERPOLATION |
#if USE_LINEAR_INTERPOLATION |
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// left channel |
// left channel |
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samplePoint.left = pSrc[pos_int] + pos_fract * (pSrc[pos_int+2] - pSrc[pos_int]); |
int x1 = getSample(pSrc, pos_int); |
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int x2 = getSample(pSrc, pos_int + 2); |
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samplePoint.left = (x1 + pos_fract * (x2 - x1)); |
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// right channel |
// right channel |
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samplePoint.right = pSrc[pos_int+1] + pos_fract * (pSrc[pos_int+3] - pSrc[pos_int+1]); |
x1 = getSample(pSrc, pos_int + 1); |
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x2 = getSample(pSrc, pos_int + 3); |
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samplePoint.right = (x1 + pos_fract * (x2 - x1)); |
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#else // polynomial interpolation |
#else // polynomial interpolation |
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// calculate left channel |
// calculate left channel |
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float xm1 = pSrc[pos_int]; |
float xm1 = pSrc[pos_int]; |
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return samplePoint; |
return samplePoint; |
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} |
} |
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#if 0 // CONFIG_ASM && ARCH_X86 |
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// TODO: no support for cubic interpolation yet |
// TODO: no support for cubic interpolation yet |
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inline static void Interpolate4StepsMonoMMXSSE(sample_t* pSrc, void* Pos, float& Pitch) { |
inline static void Interpolate4StepsMonoMMXSSE(sample_t* pSrc, void* Pos, float& Pitch) { |
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/* calculate playback position of each of the 4 samples by adding the associated pitch */ |
/* calculate playback position of each of the 4 samples by adding the associated pitch */ |
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"%xmm3" /* holds linear interpolated sample of right channel (of all 4 samples) at the end */ |
"%xmm3" /* holds linear interpolated sample of right channel (of all 4 samples) at the end */ |
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} |
} |
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#endif // CONFIG_ASM && ARCH_X86 |
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}; |
}; |
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} // namespace LinuxSampler |
} // namespace LinuxSampler |