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#ifndef CORE_BFORMATDEC_H
#define CORE_BFORMATDEC_H
#include <array>
#include <cstddef>
#include <memory>
#include <vector>
#include "almalloc.h"
#include "alspan.h"
#include "ambidefs.h"
#include "bufferline.h"
#include "devformat.h"
#include "filters/splitter.h"
struct FrontStablizer;
using ChannelDec = std::array<float,MaxAmbiChannels>;
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;
const std::unique_ptr<FrontStablizer> mStablizer;
const bool mDualBand{false};
/* TODO: This should ideally be a FlexArray, since ChannelDecoder is rather
* small and only a few are needed (3, 4, 5, 7, typically). But that can
* only be used in a standard layout struct, and a std::unique_ptr member
* (mStablizer) causes GCC and Clang to warn it's not.
*/
std::vector<ChannelDecoder> mChannelDec;
public:
BFormatDec(const size_t inchans, const al::span<const ChannelDec> coeffs,
const al::span<const ChannelDec> coeffslf, const float xover_f0norm,
std::unique_ptr<FrontStablizer> stablizer);
bool hasStablizer() const noexcept { return mStablizer != nullptr; }
/* Decodes the ambisonic input to the given output channels. */
void process(const al::span<FloatBufferLine> OutBuffer, const FloatBufferLine *InSamples,
const size_t SamplesToDo);
/* Decodes the ambisonic input to the given output channels with stablization. */
void processStablize(const al::span<FloatBufferLine> OutBuffer,
const FloatBufferLine *InSamples, const size_t lidx, const size_t ridx, const size_t cidx,
const size_t SamplesToDo);
static std::unique_ptr<BFormatDec> Create(const size_t inchans,
const al::span<const ChannelDec> coeffs, const al::span<const ChannelDec> coeffslf,
const float xover_f0norm, std::unique_ptr<FrontStablizer> stablizer);
DEF_NEWDEL(BFormatDec)
};
#endif /* CORE_BFORMATDEC_H */
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