Alc/filters/splitter.h

   1 #ifndef FILTER_SPLITTER_H
   2 #define FILTER_SPLITTER_H
   3
   4 #include "alMain.h"
   5 #include "almalloc.h"
   6
   7
   8 /* Band splitter. Splits a signal into two phase-matching frequency bands. */
   9 struct BandSplitter {
  10     ALfloat coeff{0.0f};
  11     ALfloat lp_z1{0.0f};
  12     ALfloat lp_z2{0.0f};
  13     ALfloat hp_z1{0.0f};
  14 };
  15
  16 void bandsplit_init(BandSplitter *splitter, ALfloat f0norm);
  17 void bandsplit_clear(BandSplitter *splitter);
  18 void bandsplit_process(BandSplitter *splitter, ALfloat *RESTRICT hpout, ALfloat *RESTRICT lpout,
  19                        const ALfloat *input, ALsizei count);
  20
  21 /* The all-pass portion of the band splitter. Applies the same phase shift
  22  * without splitting the signal.
  23  */
  24 struct SplitterAllpass {
  25     ALfloat coeff{0.0f};
  26     ALfloat z1{0.0f};
  27 };
  28
  29 void splitterap_init(SplitterAllpass *splitter, ALfloat f0norm);
  30 void splitterap_clear(SplitterAllpass *splitter);
  31 void splitterap_process(SplitterAllpass *splitter, ALfloat *RESTRICT samples, ALsizei count);
  32
  33
  34 struct FrontStablizer {
  35     SplitterAllpass APFilter[MAX_OUTPUT_CHANNELS];
  36     BandSplitter LFilter, RFilter;
  37     alignas(16) ALfloat LSplit[2][BUFFERSIZE];
  38     alignas(16) ALfloat RSplit[2][BUFFERSIZE];
  39
  40     DEF_NEWDEL(FrontStablizer)
  41 };
  42
  43 #endif /* FILTER_SPLITTER_H */