/*	nob.h

This file is part of a program that implements a Software-Defined Radio.

Copyright (C) 2013, 2014 Warren Pratt, NR0V

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

The author can be reached by email at

warren@wpratt.com

*/

#ifndef _anb_h
#define _anb_h

typedef struct _anb
{
	int run;
	int buffsize;					// size of input/output buffer
	double* in;						// input buffer
	double* out;					// output buffer
	int dline_size;					// length of delay line which is 'double dline[length][2]'
	double *dline;					// pointer to delay line
	double samplerate;				// samplerate, used to convert times into sample counts
	double tau;						// transition time, signal<->zero
	double hangtime;				// time to stay at zero after noise is no longer detected
	double advtime;					// deadtime (zero output) in advance of detected noise
	double backtau;					// time constant used in averaging the magnitude of the input signal
	double threshold;				// triggers if (noise > threshold * average_signal_magnitude)
	double *wave;					// pointer to array holding transition waveform
	int state;						// state of the state machine
	double avg;						// average value of the signal magnitude
	int dtime;						// count when decreasing the signal magnitude
	int htime;						// count when hanging
	int itime;						// count when increasing the signal magnitude
	int atime;						// count at zero before the noise burst (advance count)
	double coef;					// parameter in calculating transition waveform
	int trans_count;				// number of samples to equal 'tau' time
	int hang_count;					// number of samples to equal 'hangtime' time
	int adv_count;					// number of samples to equal 'advtime' time
	int in_idx;						// ring buffer position into which new samples are inserted
	int out_idx;					// ring buffer position from which delayed samples are pulled
	double power;					// level at which signal was increasing when a new decrease is started
	int count;						// set each time a noise sample is detected, counts down
	double backmult;				// multiplier for waveform averaging
	double ombackmult;				// multiplier for waveform averaging
	CRITICAL_SECTION cs_update;
	double *legacy;																										////////////  legacy interface - remove
} anb, *ANB;

__declspec (dllexport) ANB create_anb	(
	int run,
	int buffsize,
	double* in,
	double* out,
	double samplerate,
	double tau,
	double hangtime,
	double advtime,
	double backtau,
	double threshold
						);

__declspec (dllexport) void destroy_anb (ANB a);

__declspec (dllexport) void flush_anb (ANB a);

__declspec (dllexport) void xanb (ANB a);

extern __declspec (dllexport) void create_anbEXT	(
	int id,
	int run,
	int buffsize,
	double samplerate,
	double tau,
	double hangtime,
	double advtime,
	double backtau,
	double threshold
					);

extern __declspec (dllexport) void destroy_anbEXT (int id);

extern __declspec (dllexport) void flush_anbEXT (int id);

extern __declspec (dllexport) void xanbEXT (int id, double* in, double* out);

extern void setBuffers_anb (ANB a, double* in, double* out);

extern void setSamplerate_anb (ANB a, int rate);

extern void setSize_anb (ANB a, int size);


extern __declspec (dllexport) void pSetRCVRANBRun (ANB a, int run);

extern __declspec (dllexport) void pSetRCVRANBBuffsize (ANB a, int size);

extern __declspec (dllexport) void pSetRCVRANBSamplerate (ANB a, int rate);

extern __declspec (dllexport) void pSetRCVRANBTau (ANB a, double tau);

extern __declspec (dllexport) void pSetRCVRANBHangtime (ANB a, double time);

extern __declspec (dllexport) void pSetRCVRANBAdvtime (ANB a, double time);

extern __declspec (dllexport) void pSetRCVRANBBacktau (ANB a, double tau);

extern __declspec (dllexport) void pSetRCVRANBThreshold (ANB a, double thresh);

#endif
