mirror of https://github.com/axmolengine/axmol.git
76 lines
2.6 KiB
C
76 lines
2.6 KiB
C
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#ifndef BFORMATDEC_H
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#define 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 "core/ambidefs.h"
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#include "core/bufferline.h"
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#include "core/devformat.h"
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#include "core/filters/splitter.h"
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struct AmbDecConf;
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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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al::FlexArray<ChannelDecoder> mChannelDec;
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public:
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BFormatDec(const AmbDecConf *conf, const bool allow_2band, const size_t inchans,
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const uint srate, const uint (&chanmap)[MAX_OUTPUT_CHANNELS],
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std::unique_ptr<FrontStablizer> stablizer);
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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, 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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/* Retrieves per-order HF scaling factors for "upsampling" ambisonic data. */
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static std::array<float,MaxAmbiOrder+1> GetHFOrderScales(const uint in_order,
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const uint out_order) noexcept;
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static std::unique_ptr<BFormatDec> Create(const AmbDecConf *conf, const bool allow_2band,
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const size_t inchans, const uint srate, const uint (&chanmap)[MAX_OUTPUT_CHANNELS],
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std::unique_ptr<FrontStablizer> stablizer);
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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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std::unique_ptr<FrontStablizer> stablizer);
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DEF_FAM_NEWDEL(BFormatDec, mChannelDec)
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};
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#endif /* BFORMATDEC_H */
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