/[svn]/linuxsampler/trunk/src/engines/common/Resampler.h
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Diff of /linuxsampler/trunk/src/engines/common/Resampler.h

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revision 617 by schoenebeck, Wed Jun 8 21:00:06 2005 UTC revision 903 by persson, Sat Jul 22 14:22:53 2006 UTC
# Line 27  Line 27 
27  #include "../../common/global.h"  #include "../../common/global.h"
28    
29  // 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
30    // TODO: cubic interpolation is not supported for 24 bit samples
31  #ifndef USE_LINEAR_INTERPOLATION  #ifndef USE_LINEAR_INTERPOLATION
32  # 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)
33  #endif  #endif
# Line 49  namespace LinuxSampler { Line 50  namespace LinuxSampler {
50       * for linear and cubic interpolation for pitching a mono or stereo       * for linear and cubic interpolation for pitching a mono or stereo
51       * input signal.       * input signal.
52       */       */
53      template<bool INTERPOLATE>      template<bool INTERPOLATE,bool BITDEPTH24>
54      class Resampler {      class Resampler {
55          public:          public:
56              inline static float GetNextSampleMonoCPP(sample_t* pSrc, double* Pos, float& Pitch) {              inline static float GetNextSampleMonoCPP(sample_t* pSrc, double* Pos, float& Pitch) {
# Line 146  namespace LinuxSampler { Line 147  namespace LinuxSampler {
147    
148          protected:          protected:
149    
150                static int getSample(sample_t* src, int pos) {
151                    if (BITDEPTH24) {
152                        pos *= 3;
153                        unsigned char* p = (unsigned char*)src;
154                        return p[pos] << 8 | p[pos + 1] << 16 | p[pos + 2] << 24;
155                    } else {
156                        return src[pos];
157                    }
158                }
159    
160              inline static float Interpolate1StepMonoCPP(sample_t* pSrc, double* Pos, float& Pitch) {              inline static float Interpolate1StepMonoCPP(sample_t* pSrc, double* Pos, float& Pitch) {
161                  int   pos_int   = (int) *Pos;     // integer position                  int   pos_int   = (int) *Pos;     // integer position
162                  float pos_fract = *Pos - pos_int; // fractional part of position                  float pos_fract = *Pos - pos_int; // fractional part of position
163    
164                  #if USE_LINEAR_INTERPOLATION                  #if USE_LINEAR_INTERPOLATION
165                      float samplePoint  = pSrc[pos_int] + pos_fract * (pSrc[pos_int+1] - pSrc[pos_int]);                      int x1 = getSample(pSrc, pos_int);
166                        int x2 = getSample(pSrc, pos_int + 1);
167                        float samplePoint  = (x1 + pos_fract * (x2 - x1));
168                  #else // polynomial interpolation                  #else // polynomial interpolation
169                      float xm1 = pSrc[pos_int];                      float xm1 = pSrc[pos_int];
170                      float x0  = pSrc[pos_int+1];                      float x0  = pSrc[pos_int+1];
# Line 176  namespace LinuxSampler { Line 189  namespace LinuxSampler {
189    
190                  #if USE_LINEAR_INTERPOLATION                  #if USE_LINEAR_INTERPOLATION
191                      // left channel                      // left channel
192                      samplePoint.left = pSrc[pos_int]   + pos_fract * (pSrc[pos_int+2] - pSrc[pos_int]);                      int x1 = getSample(pSrc, pos_int);
193                        int x2 = getSample(pSrc, pos_int + 2);
194                        samplePoint.left  = (x1 + pos_fract * (x2 - x1));
195                      // right channel                      // right channel
196                      samplePoint.right = pSrc[pos_int+1] + pos_fract * (pSrc[pos_int+3] - pSrc[pos_int+1]);                      x1 = getSample(pSrc, pos_int + 1);
197                        x2 = getSample(pSrc, pos_int + 3);
198                        samplePoint.right = (x1 + pos_fract * (x2 - x1));
199                  #else // polynomial interpolation                  #else // polynomial interpolation
200                      // calculate left channel                      // calculate left channel
201                      float xm1 = pSrc[pos_int];                      float xm1 = pSrc[pos_int];
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