94 lines
2.8 KiB
C++
94 lines
2.8 KiB
C++
#ifndef BFORMATDEC_H
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#define BFORMATDEC_H
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#include "alMain.h"
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#include "filters/splitter.h"
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#include "almalloc.h"
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struct AmbDecConf;
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/* These are the necessary scales for first-order HF responses to play over
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* higher-order 2D (non-periphonic) decoders.
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*/
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#define W_SCALE_2H0P 1.224744871f /* sqrt(1.5) */
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#define XYZ_SCALE_2H0P 1.0f
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#define W_SCALE_3H0P 1.414213562f /* sqrt(2) */
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#define XYZ_SCALE_3H0P 1.082392196f
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/* These are the necessary scales for first-order HF responses to play over
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* higher-order 3D (periphonic) decoders.
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*/
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#define W_SCALE_2H2P 1.341640787f /* sqrt(1.8) */
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#define XYZ_SCALE_2H2P 1.0f
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#define W_SCALE_3H3P 1.695486018f
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#define XYZ_SCALE_3H3P 1.136697713f
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class BFormatDec {
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public:
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static constexpr size_t sNumBands{2};
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private:
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ALuint mEnabled; /* Bitfield of enabled channels. */
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union MatrixU {
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ALfloat Dual[MAX_OUTPUT_CHANNELS][sNumBands][MAX_AMBI_COEFFS];
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ALfloat Single[MAX_OUTPUT_CHANNELS][MAX_AMBI_COEFFS];
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} mMatrix;
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/* NOTE: BandSplitter filters are unused with single-band decoding */
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BandSplitter mXOver[MAX_AMBI_COEFFS];
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al::vector<std::array<ALfloat,BUFFERSIZE>, 16> mSamples;
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/* These two alias into Samples */
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std::array<ALfloat,BUFFERSIZE> *mSamplesHF;
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std::array<ALfloat,BUFFERSIZE> *mSamplesLF;
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alignas(16) ALfloat mChannelMix[BUFFERSIZE];
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struct {
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BandSplitter XOver;
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ALfloat Gains[sNumBands];
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} mUpSampler[4];
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ALsizei mNumChannels;
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ALboolean mDualBand;
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public:
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void reset(const AmbDecConf *conf, ALsizei chancount, ALuint srate, const ALsizei (&chanmap)[MAX_OUTPUT_CHANNELS]);
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/* Decodes the ambisonic input to the given output channels. */
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void process(ALfloat (*RESTRICT OutBuffer)[BUFFERSIZE], const ALsizei OutChannels, const ALfloat (*RESTRICT InSamples)[BUFFERSIZE], const ALsizei SamplesToDo);
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/* Up-samples a first-order input to the decoder's configuration. */
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void upSample(ALfloat (*RESTRICT OutBuffer)[BUFFERSIZE], const ALfloat (*RESTRICT InSamples)[BUFFERSIZE], const ALsizei InChannels, const ALsizei SamplesToDo);
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DEF_NEWDEL(BFormatDec)
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};
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/* Stand-alone first-order upsampler. Kept here because it shares some stuff
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* with bformatdec. Assumes a periphonic (4-channel) input mix!
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*/
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class AmbiUpsampler {
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public:
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static constexpr size_t sNumBands{2};
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private:
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alignas(16) ALfloat mSamples[sNumBands][BUFFERSIZE];
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BandSplitter mXOver[4];
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std::array<std::array<std::array<ALfloat,sNumBands>,MAX_OUTPUT_CHANNELS>,4> mGains;
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public:
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void reset(const ALCdevice *device, const ALfloat w_scale, const ALfloat xyz_scale);
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void process(ALfloat (*RESTRICT OutBuffer)[BUFFERSIZE], const ALsizei OutChannels, const ALfloat (*RESTRICT InSamples)[BUFFERSIZE], const ALsizei SamplesToDo);
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DEF_NEWDEL(AmbiUpsampler)
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};
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#endif /* BFORMATDEC_H */
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