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#ifndef BFORMATDEC_H
#define BFORMATDEC_H
#include <array>
#include <cstddef>
#include <memory>
#include "AL/al.h"
#include "alcmain.h"
#include "almalloc.h"
#include "alspan.h"
#include "ambidefs.h"
#include "devformat.h"
#include "filters/splitter.h"
struct AmbDecConf;
using ChannelDec = float[MAX_AMBI_CHANNELS];
class BFormatDec {
static constexpr size_t sHFBand{0};
static constexpr size_t sLFBand{1};
static constexpr size_t sNumBands{2};
struct ChannelDecoder {
union MatrixU {
float Dual[sNumBands][MAX_OUTPUT_CHANNELS];
float Single[MAX_OUTPUT_CHANNELS];
} mGains{};
/* NOTE: BandSplitter filter is unused with single-band decoding. */
BandSplitter mXOver;
};
alignas(16) std::array<FloatBufferLine,2> mSamples;
bool mDualBand{false};
al::FlexArray<ChannelDecoder> mChannelDec;
public:
BFormatDec(const AmbDecConf *conf, const bool allow_2band, const ALuint inchans,
const ALuint srate, const ALuint (&chanmap)[MAX_OUTPUT_CHANNELS]);
BFormatDec(const ALuint inchans, const al::span<const ChannelDec> chancoeffs);
/* Decodes the ambisonic input to the given output channels. */
void process(const al::span<FloatBufferLine> OutBuffer, const FloatBufferLine *InSamples,
const size_t SamplesToDo);
/* Retrieves per-order HF scaling factors for "upsampling" ambisonic data. */
static std::array<float,MAX_AMBI_ORDER+1> GetHFOrderScales(const ALuint in_order,
const ALuint out_order) noexcept;
static std::unique_ptr<BFormatDec> Create(const AmbDecConf *conf, const bool allow_2band,
const ALuint inchans, const ALuint srate, const ALuint (&chanmap)[MAX_OUTPUT_CHANNELS])
{
return std::unique_ptr<BFormatDec>{new(FamCount{inchans})
BFormatDec{conf, allow_2band, inchans, srate, chanmap}};
}
static std::unique_ptr<BFormatDec> Create(const ALuint inchans,
const al::span<const ChannelDec> chancoeffs)
{
return std::unique_ptr<BFormatDec>{new(FamCount{inchans}) BFormatDec{inchans, chancoeffs}};
}
DEF_FAM_NEWDEL(BFormatDec, mChannelDec)
};
#endif /* BFORMATDEC_H */
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