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71 lines
2.3 KiB
71 lines
2.3 KiB
#ifndef CORE_BFORMATDEC_H
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#define CORE_BFORMATDEC_H
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#include <array>
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#include <cstddef>
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#include <memory>
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#include "almalloc.h"
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#include "alspan.h"
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#include "ambidefs.h"
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#include "bufferline.h"
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#include "devformat.h"
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#include "filters/splitter.h"
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#include "vector.h"
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struct FrontStablizer;
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using ChannelDec = std::array<float,MaxAmbiChannels>;
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class BFormatDec {
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static constexpr size_t sHFBand{0};
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static constexpr size_t sLFBand{1};
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static constexpr size_t sNumBands{2};
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struct ChannelDecoder {
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union MatrixU {
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float Dual[sNumBands][MAX_OUTPUT_CHANNELS];
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float Single[MAX_OUTPUT_CHANNELS];
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} mGains{};
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/* NOTE: BandSplitter filter is unused with single-band decoding. */
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BandSplitter mXOver;
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};
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alignas(16) std::array<FloatBufferLine,2> mSamples;
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const std::unique_ptr<FrontStablizer> mStablizer;
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const bool mDualBand{false};
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/* TODO: This should ideally be a FlexArray, since ChannelDecoder is rather
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* small and only a few are needed (3, 4, 5, 7, typically). But that can
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* only be used in a standard layout struct, and a std::unique_ptr member
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* (mStablizer) causes GCC and Clang to warn it's not.
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*/
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al::vector<ChannelDecoder> mChannelDec;
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public:
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BFormatDec(const size_t inchans, const al::span<const ChannelDec> coeffs,
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const al::span<const ChannelDec> coeffslf, const float xover_f0norm,
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std::unique_ptr<FrontStablizer> stablizer);
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bool hasStablizer() const noexcept { return mStablizer != nullptr; }
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/* Decodes the ambisonic input to the given output channels. */
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void process(const al::span<FloatBufferLine> OutBuffer, const FloatBufferLine *InSamples,
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const size_t SamplesToDo);
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/* Decodes the ambisonic input to the given output channels with stablization. */
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void processStablize(const al::span<FloatBufferLine> OutBuffer,
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const FloatBufferLine *InSamples, const size_t lidx, const size_t ridx, const size_t cidx,
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const size_t SamplesToDo);
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static std::unique_ptr<BFormatDec> Create(const size_t inchans,
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const al::span<const ChannelDec> coeffs, const al::span<const ChannelDec> coeffslf,
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const float xover_f0norm, std::unique_ptr<FrontStablizer> stablizer);
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DEF_NEWDEL(BFormatDec)
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};
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#endif /* CORE_BFORMATDEC_H */
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