96 lines
3.1 KiB
C++
96 lines
3.1 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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/* NOTE: These are scale factors as applied to Ambisonics content. Decoder
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* coefficients should be divided by these values to get proper N3D scalings.
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*/
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extern const ALfloat N3D2N3DScale[MAX_AMBI_COEFFS];
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extern const ALfloat SN3D2N3DScale[MAX_AMBI_COEFFS];
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extern const ALfloat FuMa2N3DScale[MAX_AMBI_COEFFS];
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struct BFormatDec {
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static constexpr size_t NumBands{2};
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ALuint Enabled; /* Bitfield of enabled channels. */
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union {
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alignas(16) ALfloat Dual[MAX_OUTPUT_CHANNELS][NumBands][MAX_AMBI_COEFFS];
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alignas(16) ALfloat Single[MAX_OUTPUT_CHANNELS][MAX_AMBI_COEFFS];
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} Matrix;
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/* NOTE: BandSplitter filters are unused with single-band decoding */
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BandSplitter XOver[MAX_AMBI_COEFFS];
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al::vector<std::array<ALfloat,BUFFERSIZE>, 16> Samples;
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/* These two alias into Samples */
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std::array<ALfloat,BUFFERSIZE> *SamplesHF;
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std::array<ALfloat,BUFFERSIZE> *SamplesLF;
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alignas(16) ALfloat ChannelMix[BUFFERSIZE];
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struct {
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BandSplitter XOver;
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ALfloat Gains[NumBands];
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} UpSampler[4];
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ALsizei NumChannels;
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ALboolean DualBand;
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DEF_NEWDEL(BFormatDec)
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};
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void bformatdec_reset(BFormatDec *dec, 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 bformatdec_process(BFormatDec *dec, ALfloat (*RESTRICT OutBuffer)[BUFFERSIZE], ALsizei OutChannels, const ALfloat (*RESTRICT InSamples)[BUFFERSIZE], ALsizei SamplesToDo);
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/* Up-samples a first-order input to the decoder's configuration. */
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void bformatdec_upSample(BFormatDec *dec, ALfloat (*RESTRICT OutBuffer)[BUFFERSIZE], const ALfloat (*RESTRICT InSamples)[BUFFERSIZE], ALsizei InChannels, ALsizei SamplesToDo);
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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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struct AmbiUpsampler {
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static constexpr size_t NumBands{2};
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alignas(16) ALfloat Samples[NumBands][BUFFERSIZE];
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BandSplitter XOver[4];
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ALfloat Gains[4][MAX_OUTPUT_CHANNELS][NumBands];
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DEF_NEWDEL(AmbiUpsampler)
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};
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void ambiup_reset(AmbiUpsampler *ambiup, const ALCdevice *device, ALfloat w_scale, ALfloat xyz_scale);
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void ambiup_process(AmbiUpsampler *ambiup, ALfloat (*RESTRICT OutBuffer)[BUFFERSIZE], ALsizei OutChannels, const ALfloat (*RESTRICT InSamples)[BUFFERSIZE], ALsizei SamplesToDo);
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#endif /* BFORMATDEC_H */
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