core/uhjfilter.h

   1 #ifndef CORE_UHJFILTER_H
   2 #define CORE_UHJFILTER_H
   3
   4 #include <array>
   5
   6 #include "almalloc.h"
   7 #include "bufferline.h"
   8
   9
  10 struct Uhj2Encoder {
  11     /* A particular property of the filter allows it to cover nearly twice its
  12      * length, so the filter size is also the effective delay (despite being
  13      * center-aligned).
  14      */
  15     constexpr static size_t sFilterSize{128};
  16
  17     /* Delays for the unfiltered signal. */
  18     alignas(16) std::array<float,sFilterSize> mMidDelay{};
  19     alignas(16) std::array<float,sFilterSize> mSideDelay{};
  20
  21     alignas(16) std::array<float,BufferLineSize+sFilterSize> mMid{};
  22     alignas(16) std::array<float,BufferLineSize+sFilterSize> mSide{};
  23
  24     /* History for the FIR filter. */
  25     alignas(16) std::array<float,sFilterSize*2 - 1> mSideHistory{};
  26
  27     alignas(16) std::array<float,BufferLineSize + sFilterSize*2> mTemp{};
  28
  29     /**
  30      * Encodes a 2-channel UHJ (stereo-compatible) signal from a B-Format input
  31      * signal. The input must use FuMa channel ordering and scaling.
  32      */
  33     void encode(FloatBufferLine &LeftOut, FloatBufferLine &RightOut,
  34         const FloatBufferLine *InSamples, const size_t SamplesToDo);
  35
  36     DEF_NEWDEL(Uhj2Encoder)
  37 };
  38
  39 #endif /* CORE_UHJFILTER_H */