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#ifndef BFORMATDEC_H
#define BFORMATDEC_H
#include "alMain.h"
#include "filters/splitter.h"
#include "almalloc.h"
struct AmbDecConf;
/* These are the necessary scales for first-order HF responses to play over
* higher-order 2D (non-periphonic) decoders.
*/
#define W_SCALE_2H0P 1.224744871f /* sqrt(1.5) */
#define XYZ_SCALE_2H0P 1.0f
#define W_SCALE_3H0P 1.414213562f /* sqrt(2) */
#define XYZ_SCALE_3H0P 1.082392196f
/* These are the necessary scales for first-order HF responses to play over
* higher-order 3D (periphonic) decoders.
*/
#define W_SCALE_2H2P 1.341640787f /* sqrt(1.8) */
#define XYZ_SCALE_2H2P 1.0f
#define W_SCALE_3H3P 1.695486018f
#define XYZ_SCALE_3H3P 1.136697713f
/* NOTE: These are scale factors as applied to Ambisonics content. Decoder
* coefficients should be divided by these values to get proper N3D scalings.
*/
extern const ALfloat N3D2N3DScale[MAX_AMBI_COEFFS];
extern const ALfloat SN3D2N3DScale[MAX_AMBI_COEFFS];
extern const ALfloat FuMa2N3DScale[MAX_AMBI_COEFFS];
struct BFormatDec {
static constexpr size_t NumBands{2};
ALuint Enabled; /* Bitfield of enabled channels. */
union {
alignas(16) ALfloat Dual[MAX_OUTPUT_CHANNELS][NumBands][MAX_AMBI_COEFFS];
alignas(16) ALfloat Single[MAX_OUTPUT_CHANNELS][MAX_AMBI_COEFFS];
} Matrix;
/* NOTE: BandSplitter filters are unused with single-band decoding */
BandSplitter XOver[MAX_AMBI_COEFFS];
al::vector<std::array<ALfloat,BUFFERSIZE>, 16> Samples;
/* These two alias into Samples */
std::array<ALfloat,BUFFERSIZE> *SamplesHF;
std::array<ALfloat,BUFFERSIZE> *SamplesLF;
alignas(16) ALfloat ChannelMix[BUFFERSIZE];
struct {
BandSplitter XOver;
ALfloat Gains[NumBands];
} UpSampler[4];
ALsizei NumChannels;
ALboolean DualBand;
DEF_NEWDEL(BFormatDec)
};
void bformatdec_reset(BFormatDec *dec, const AmbDecConf *conf, ALsizei chancount, ALuint srate, const ALsizei chanmap[MAX_OUTPUT_CHANNELS]);
/* Decodes the ambisonic input to the given output channels. */
void bformatdec_process(BFormatDec *dec, ALfloat (*RESTRICT OutBuffer)[BUFFERSIZE], ALsizei OutChannels, const ALfloat (*RESTRICT InSamples)[BUFFERSIZE], ALsizei SamplesToDo);
/* Up-samples a first-order input to the decoder's configuration. */
void bformatdec_upSample(BFormatDec *dec, ALfloat (*RESTRICT OutBuffer)[BUFFERSIZE], const ALfloat (*RESTRICT InSamples)[BUFFERSIZE], ALsizei InChannels, ALsizei SamplesToDo);
/* Stand-alone first-order upsampler. Kept here because it shares some stuff
* with bformatdec. Assumes a periphonic (4-channel) input mix!
*/
struct AmbiUpsampler {
static constexpr size_t NumBands{2};
alignas(16) ALfloat Samples[NumBands][BUFFERSIZE];
BandSplitter XOver[4];
ALfloat Gains[4][MAX_OUTPUT_CHANNELS][NumBands];
DEF_NEWDEL(AmbiUpsampler)
};
void ambiup_reset(AmbiUpsampler *ambiup, const ALCdevice *device, ALfloat w_scale, ALfloat xyz_scale);
void ambiup_process(AmbiUpsampler *ambiup, ALfloat (*RESTRICT OutBuffer)[BUFFERSIZE], ALsizei OutChannels, const ALfloat (*RESTRICT InSamples)[BUFFERSIZE], ALsizei SamplesToDo);
#endif /* BFORMATDEC_H */
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