236 lines
6.4 KiB
C
236 lines
6.4 KiB
C
#ifndef _ALU_H_
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#define _ALU_H_
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#include <limits.h>
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#include <math.h>
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#ifdef HAVE_FLOAT_H
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#include <float.h>
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#endif
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#ifdef HAVE_IEEEFP_H
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#include <ieeefp.h>
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#endif
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#include "alMain.h"
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#include "alBuffer.h"
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#include "alFilter.h"
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#include "hrtf.h"
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#include "align.h"
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#define F_PI (3.14159265358979323846f)
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#define F_PI_2 (1.57079632679489661923f)
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#define F_2PI (6.28318530717958647692f)
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#ifndef FLT_EPSILON
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#define FLT_EPSILON (1.19209290e-07f)
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#endif
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#define DEG2RAD(x) ((ALfloat)(x) * (F_PI/180.0f))
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#define RAD2DEG(x) ((ALfloat)(x) * (180.0f/F_PI))
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#define MAX_PITCH (10)
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct ALsource;
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struct ALvoice;
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enum ActiveFilters {
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AF_None = 0,
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AF_LowPass = 1,
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AF_HighPass = 2,
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AF_BandPass = AF_LowPass | AF_HighPass
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};
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typedef struct MixGains {
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ALfloat Current;
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ALfloat Step;
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ALfloat Target;
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} MixGains;
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typedef struct DirectParams {
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ALfloat (*OutBuffer)[BUFFERSIZE];
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ALuint OutChannels;
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/* If not 'moving', gain/coefficients are set directly without fading. */
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ALboolean Moving;
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/* Stepping counter for gain/coefficient fading. */
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ALuint Counter;
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/* Last direction (relative to listener) and gain of a moving source. */
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ALfloat LastDir[3];
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ALfloat LastGain;
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struct {
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enum ActiveFilters ActiveType;
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ALfilterState LowPass;
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ALfilterState HighPass;
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} Filters[MAX_INPUT_CHANNELS];
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struct {
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HrtfParams Params[MAX_INPUT_CHANNELS];
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HrtfState State[MAX_INPUT_CHANNELS];
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} Hrtf;
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MixGains Gains[MAX_INPUT_CHANNELS][MAX_OUTPUT_CHANNELS];
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} DirectParams;
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typedef struct SendParams {
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ALfloat (*OutBuffer)[BUFFERSIZE];
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ALboolean Moving;
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ALuint Counter;
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struct {
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enum ActiveFilters ActiveType;
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ALfilterState LowPass;
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ALfilterState HighPass;
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} Filters[MAX_INPUT_CHANNELS];
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/* Gain control, which applies to all input channels to a single (mono)
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* output buffer. */
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MixGains Gain;
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} SendParams;
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typedef const ALfloat* (*ResamplerFunc)(const ALfloat *src, ALuint frac, ALuint increment,
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ALfloat *restrict dst, ALuint dstlen);
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typedef void (*MixerFunc)(const ALfloat *data, ALuint OutChans,
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ALfloat (*restrict OutBuffer)[BUFFERSIZE], struct MixGains *Gains,
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ALuint Counter, ALuint OutPos, ALuint BufferSize);
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typedef void (*HrtfMixerFunc)(ALfloat (*restrict OutBuffer)[BUFFERSIZE], const ALfloat *data,
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ALuint Counter, ALuint Offset, ALuint OutPos,
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const ALuint IrSize, const HrtfParams *hrtfparams,
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HrtfState *hrtfstate, ALuint BufferSize);
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#define GAIN_SILENCE_THRESHOLD (0.00001f) /* -100dB */
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#define SPEEDOFSOUNDMETRESPERSEC (343.3f)
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#define AIRABSORBGAINHF (0.99426f) /* -0.05dB */
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#define FRACTIONBITS (12)
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#define FRACTIONONE (1<<FRACTIONBITS)
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#define FRACTIONMASK (FRACTIONONE-1)
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inline ALfloat minf(ALfloat a, ALfloat b)
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{ return ((a > b) ? b : a); }
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inline ALfloat maxf(ALfloat a, ALfloat b)
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{ return ((a > b) ? a : b); }
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inline ALfloat clampf(ALfloat val, ALfloat min, ALfloat max)
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{ return minf(max, maxf(min, val)); }
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inline ALdouble mind(ALdouble a, ALdouble b)
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{ return ((a > b) ? b : a); }
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inline ALdouble maxd(ALdouble a, ALdouble b)
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{ return ((a > b) ? a : b); }
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inline ALdouble clampd(ALdouble val, ALdouble min, ALdouble max)
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{ return mind(max, maxd(min, val)); }
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inline ALuint minu(ALuint a, ALuint b)
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{ return ((a > b) ? b : a); }
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inline ALuint maxu(ALuint a, ALuint b)
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{ return ((a > b) ? a : b); }
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inline ALuint clampu(ALuint val, ALuint min, ALuint max)
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{ return minu(max, maxu(min, val)); }
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inline ALint mini(ALint a, ALint b)
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{ return ((a > b) ? b : a); }
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inline ALint maxi(ALint a, ALint b)
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{ return ((a > b) ? a : b); }
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inline ALint clampi(ALint val, ALint min, ALint max)
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{ return mini(max, maxi(min, val)); }
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inline ALint64 mini64(ALint64 a, ALint64 b)
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{ return ((a > b) ? b : a); }
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inline ALint64 maxi64(ALint64 a, ALint64 b)
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{ return ((a > b) ? a : b); }
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inline ALint64 clampi64(ALint64 val, ALint64 min, ALint64 max)
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{ return mini64(max, maxi64(min, val)); }
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inline ALuint64 minu64(ALuint64 a, ALuint64 b)
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{ return ((a > b) ? b : a); }
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inline ALuint64 maxu64(ALuint64 a, ALuint64 b)
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{ return ((a > b) ? a : b); }
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inline ALuint64 clampu64(ALuint64 val, ALuint64 min, ALuint64 max)
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{ return minu64(max, maxu64(min, val)); }
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extern ALfloat CubicLUT[FRACTIONONE][4];
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inline ALfloat lerp(ALfloat val1, ALfloat val2, ALfloat mu)
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{
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return val1 + (val2-val1)*mu;
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}
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inline ALfloat cubic(ALfloat val0, ALfloat val1, ALfloat val2, ALfloat val3, ALuint frac)
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{
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const ALfloat *k = CubicLUT[frac];
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return k[0]*val0 + k[1]*val1 + k[2]*val2 + k[3]*val3;
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}
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void aluInitResamplers(void);
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ALvoid aluInitPanning(ALCdevice *Device);
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/**
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* ComputeDirectionalGains
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*
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* Sets channel gains based on a direction. The direction must be a 3-component
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* vector no longer than 1 unit.
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*/
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void ComputeDirectionalGains(const ALCdevice *device, const ALfloat dir[3], ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS]);
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/**
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* ComputeAngleGains
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*
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* Sets channel gains based on angle and elevation. The angle and elevation
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* parameters are in radians, going right and up respectively.
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*/
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void ComputeAngleGains(const ALCdevice *device, ALfloat angle, ALfloat elevation, ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS]);
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/**
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* ComputeAmbientGains
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*
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* Sets channel gains for ambient, omni-directional sounds.
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*/
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void ComputeAmbientGains(const ALCdevice *device, ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS]);
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/**
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* ComputeBFormatGains
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*
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* Sets channel gains for a given (first-order) B-Format channel. The matrix is
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* a 1x4 'slice' of the rotation matrix for a given channel used to orient the
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* coefficients.
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*/
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void ComputeBFormatGains(const ALCdevice *device, const ALfloat mtx[4], ALfloat ingain, ALfloat gains[MAX_OUTPUT_CHANNELS]);
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ALvoid CalcSourceParams(struct ALvoice *voice, const struct ALsource *source, const ALCcontext *ALContext);
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ALvoid CalcNonAttnSourceParams(struct ALvoice *voice, const struct ALsource *source, const ALCcontext *ALContext);
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ALvoid MixSource(struct ALvoice *voice, struct ALsource *source, ALCdevice *Device, ALuint SamplesToDo);
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ALvoid aluMixData(ALCdevice *device, ALvoid *buffer, ALsizei size);
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/* Caller must lock the device. */
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ALvoid aluHandleDisconnect(ALCdevice *device);
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extern ALfloat ConeScale;
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extern ALfloat ZScale;
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#ifdef __cplusplus
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}
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#endif
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#endif
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