/[svn]/linuxsampler/trunk/src/engines/gig/Voice.cpp
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Diff of /linuxsampler/trunk/src/engines/gig/Voice.cpp

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revision 3628 by schoenebeck, Sat Oct 5 14:37:31 2019 UTC revision 3646 by schoenebeck, Sun Dec 8 23:17:34 2019 UTC
# Line 429  namespace LinuxSampler { namespace gig { Line 429  namespace LinuxSampler { namespace gig {
429          return cutoff;          return cutoff;
430      }      }
431    
432        /// Returns true for GigaStudio's original filter types.
433        constexpr bool isGStFilterType(::gig::vcf_type_t type) {
434            return type == ::gig::vcf_type_lowpass ||
435                   type == ::gig::vcf_type_lowpassturbo ||
436                   type == ::gig::vcf_type_bandpass ||
437                   type == ::gig::vcf_type_highpass ||
438                   type == ::gig::vcf_type_bandreject;
439        }
440    
441      float Voice::CalculateFinalCutoff(float cutoffBase) {      float Voice::CalculateFinalCutoff(float cutoffBase) {
442          int cvalue;          int cvalue;
443          if (VCFCutoffCtrl.controller) {          if (VCFCutoffCtrl.controller) {
# Line 443  namespace LinuxSampler { namespace gig { Line 452  namespace LinuxSampler { namespace gig {
452          float fco = cutoffBase * float(cvalue);          float fco = cutoffBase * float(cvalue);
453          if (fco > 127.0f) fco = 127.0f;          if (fco > 127.0f) fco = 127.0f;
454    
455            // the filter implementations of the original GSt filter types take an
456            // abstract cutoff parameter range of 0..127, ...
457            if (isGStFilterType(pRegion->VCFType))
458                return fco;
459    
460            // ... whereas our own filter types take a cutoff parameter in Hz, so
461            // remap here 0 .. 127 [lin] -> 21 Hz .. 18 kHz [log4] (center @2.2 kHz)
462            fco = (fco + 29.f) / (127.f + 29.f);
463            fco = fco * fco * fco * fco * 18000.f;
464            if (fco > 0.49f * pEngine->SampleRate)
465                fco = 0.49f * pEngine->SampleRate;
466          return fco;          return fco;
467      }      }
468    
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