Chris Robinson
74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
#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 "AL/al.h"
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#include "alcmain.h"
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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 "devformat.h"
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#include "filters/splitter.h"
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struct AmbDecConf;
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using ChannelDec = float[MAX_AMBI_CHANNELS];
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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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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 ALuint inchans,
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const ALuint srate, const ALuint (&chanmap)[MAX_OUTPUT_CHANNELS]);
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BFormatDec(const ALuint inchans, const ChannelDec (&chancoeffs)[MAX_OUTPUT_CHANNELS],
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const al::span<const ALuint> chanmap);
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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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/* Retrieves per-order HF scaling factors for "upsampling" ambisonic data. */
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static std::array<float,MAX_AMBI_ORDER+1> GetHFOrderScales(const ALuint in_order,
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const ALuint 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 ALuint inchans, const ALuint srate, const ALuint (&chanmap)[MAX_OUTPUT_CHANNELS])
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{
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return std::unique_ptr<BFormatDec>{new(FamCount{inchans})
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BFormatDec{conf, allow_2band, inchans, srate, chanmap}};
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}
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static std::unique_ptr<BFormatDec> Create(const ALuint inchans,
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const ChannelDec (&chancoeffs)[MAX_OUTPUT_CHANNELS], const al::span<const ALuint> chanmap)
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{
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return std::unique_ptr<BFormatDec>{new(FamCount{inchans})
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BFormatDec{inchans, chancoeffs, chanmap}};
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}
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DEF_FAM_NEWDEL(BFormatDec, mChannelDec)
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};
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#endif /* BFORMATDEC_H */
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