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#ifndef BFORMATDEC_H
#define BFORMATDEC_H
#include <array>
#include <cstddef>
#include "AL/al.h"
#include "alcmain.h"
#include "almalloc.h"
#include "alspan.h"
#include "ambidefs.h"
#include "filters/splitter.h"
#include "vector.h"
struct AmbDecConf;
using ChannelDec = ALfloat[MAX_AMBI_CHANNELS];
class BFormatDec {
static constexpr size_t sHFBand{0};
static constexpr size_t sLFBand{1};
static constexpr size_t sNumBands{2};
ALuint mEnabled{0u}; /* Bitfield of enabled channels. */
union MatrixU {
ALfloat Dual[MAX_OUTPUT_CHANNELS][sNumBands][MAX_AMBI_CHANNELS];
ALfloat Single[MAX_OUTPUT_CHANNELS][MAX_AMBI_CHANNELS];
} mMatrix{};
/* NOTE: BandSplitter filters are unused with single-band decoding */
BandSplitter mXOver[MAX_AMBI_CHANNELS];
al::vector<FloatBufferLine, 16> mSamples;
/* These two alias into Samples */
FloatBufferLine *mSamplesHF{nullptr};
FloatBufferLine *mSamplesLF{nullptr};
ALuint mNumChannels{0u};
bool mDualBand{false};
public:
BFormatDec(const AmbDecConf *conf, const bool allow_2band, const ALuint inchans,
const ALuint srate, const ALsizei (&chanmap)[MAX_OUTPUT_CHANNELS]);
BFormatDec(const ALuint inchans, const ALsizei chancount,
const ChannelDec (&chancoeffs)[MAX_OUTPUT_CHANNELS],
const ALsizei (&chanmap)[MAX_OUTPUT_CHANNELS]);
/* Decodes the ambisonic input to the given output channels. */
void process(const al::span<FloatBufferLine> OutBuffer, const FloatBufferLine *InSamples,
const ALsizei SamplesToDo);
/* Retrieves per-order HF scaling factors for "upsampling" ambisonic data. */
static std::array<ALfloat,MAX_AMBI_ORDER+1> GetHFOrderScales(const ALsizei in_order,
const ALsizei out_order) noexcept;
DEF_NEWDEL(BFormatDec)
};
#endif /* BFORMATDEC_H */
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