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 */
40