🛠️🐜 Antkeeper superbuild with dependencies included
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125 lines
3.3 KiB
125 lines
3.3 KiB
#ifndef MAKEMHR_H
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#define MAKEMHR_H
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#include <vector>
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#include <complex>
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// The maximum path length used when processing filenames.
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#define MAX_PATH_LEN (256)
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// The limit to the number of 'distances' listed in the data set definition.
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#define MAX_FD_COUNT (16)
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// The limits to the number of 'azimuths' listed in the data set definition.
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#define MIN_EV_COUNT (5)
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#define MAX_EV_COUNT (128)
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// The limits for each of the 'azimuths' listed in the data set definition.
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#define MIN_AZ_COUNT (1)
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#define MAX_AZ_COUNT (128)
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// The limits for the 'distance' from source to listener for each field in
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// the definition file.
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#define MIN_DISTANCE (0.05)
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#define MAX_DISTANCE (2.50)
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// The limits for the sample 'rate' metric in the data set definition and for
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// resampling.
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#define MIN_RATE (32000)
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#define MAX_RATE (96000)
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// The limits for the HRIR 'points' metric in the data set definition.
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#define MIN_POINTS (16)
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#define MAX_POINTS (8192)
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using uint = unsigned int;
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/* Complex double type. */
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using complex_d = std::complex<double>;
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enum ChannelModeT : bool {
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CM_AllowStereo = false,
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CM_ForceMono = true
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};
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// Sample and channel type enum values.
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enum SampleTypeT {
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ST_S16 = 0,
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ST_S24 = 1
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};
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// Certain iterations rely on these integer enum values.
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enum ChannelTypeT {
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CT_NONE = -1,
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CT_MONO = 0,
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CT_STEREO = 1
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};
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// Structured HRIR storage for stereo azimuth pairs, elevations, and fields.
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struct HrirAzT {
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double mAzimuth{0.0};
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uint mIndex{0u};
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double mDelays[2]{0.0, 0.0};
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double *mIrs[2]{nullptr, nullptr};
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};
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struct HrirEvT {
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double mElevation{0.0};
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uint mIrCount{0u};
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uint mAzCount{0u};
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HrirAzT *mAzs{nullptr};
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};
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struct HrirFdT {
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double mDistance{0.0};
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uint mIrCount{0u};
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uint mEvCount{0u};
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uint mEvStart{0u};
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HrirEvT *mEvs{nullptr};
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};
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// The HRIR metrics and data set used when loading, processing, and storing
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// the resulting HRTF.
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struct HrirDataT {
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uint mIrRate{0u};
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SampleTypeT mSampleType{ST_S24};
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ChannelTypeT mChannelType{CT_NONE};
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uint mIrPoints{0u};
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uint mFftSize{0u};
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uint mIrSize{0u};
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double mRadius{0.0};
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uint mIrCount{0u};
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uint mFdCount{0u};
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std::vector<double> mHrirsBase;
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std::vector<HrirEvT> mEvsBase;
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std::vector<HrirAzT> mAzsBase;
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std::vector<HrirFdT> mFds;
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};
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int PrepareHrirData(const uint fdCount, const double (&distances)[MAX_FD_COUNT], const uint (&evCounts)[MAX_FD_COUNT], const uint azCounts[MAX_FD_COUNT * MAX_EV_COUNT], HrirDataT *hData);
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void MagnitudeResponse(const uint n, const complex_d *in, double *out);
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void FftForward(const uint n, complex_d *inout);
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void FftInverse(const uint n, complex_d *inout);
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// The resampler metrics and FIR filter.
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struct ResamplerT {
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uint mP, mQ, mM, mL;
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std::vector<double> mF;
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};
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void ResamplerSetup(ResamplerT *rs, const uint srcRate, const uint dstRate);
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void ResamplerRun(ResamplerT *rs, const uint inN, const double *in, const uint outN, double *out);
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// Performs linear interpolation.
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inline double Lerp(const double a, const double b, const double f)
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{ return a + f * (b - a); }
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#endif /* MAKEMHR_H */
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