direwolf/rrbb.h

#ifndef RRBB_H

#define RRBB_H


typedef short slice_t;


#ifdef RRBB_C

/* 
 * Maximum size (in bytes) of an AX.25 frame including the 2 octet FCS. 
 */

#define MAX_FRAME_LEN ((AX25_MAX_PACKET_LEN) + 2)	

/*
 * Maximum number of bits in AX.25 frame excluding the flags.
 * Adequate for extreme case of bit stuffing after every 5 bits
 * which could never happen.
 */

#define MAX_NUM_BITS (MAX_FRAME_LEN * 8 * 6 / 5)

#define SOI 32

typedef struct rrbb_s {
	int magic1;
	struct rrbb_s* nextp;	/* Next pointer to maintain a queue. */
	int chan;		/* Radio channel from which it was received. */
	int subchan;		/* Which modem when more than one per channel. */
	alevel_t alevel;	/* Received audio level at time of frame capture. */
	unsigned int len;	/* Current number of samples in array. */

	int is_scrambled;	/* Is data scrambled G3RUH / K9NG style? */
	int descram_state;	/* Descrambler state before first data bit of frame. */
	int prev_descram;	/* Previous descrambled bit. */

	unsigned int data[(MAX_NUM_BITS+SOI-1)/SOI];
	unsigned int computed_data[MAX_NUM_BITS];

	int magic2;
} *rrbb_t;

#else

/* Hide the implementation. */

typedef void *rrbb_t;

#endif



rrbb_t rrbb_new (int chan, int subchan, int is_scrambled, int descram_state, int prev_descram);

void rrbb_clear (rrbb_t b, int is_scrambled, int descram_state, int prev_descram);


void rrbb_append_bit (rrbb_t b, int val);


void rrbb_chop8 (rrbb_t b);

int rrbb_get_len (rrbb_t b);

int rrbb_get_bit (rrbb_t b, unsigned int ind);
unsigned int rrbb_get_computed_bit (rrbb_t b, unsigned int ind);
int rrbb_compute_bits (rrbb_t b);

//void rrbb_flip_bit (rrbb_t b, unsigned int ind);

void rrbb_delete (rrbb_t b);

void rrbb_set_nextp (rrbb_t b, rrbb_t np);
rrbb_t rrbb_get_nextp (rrbb_t b);

int rrbb_get_chan (rrbb_t b);
int rrbb_get_subchan (rrbb_t b);

void rrbb_set_audio_level (rrbb_t b, alevel_t alevel);
alevel_t rrbb_get_audio_level (rrbb_t b);

int rrbb_get_is_scrambled (rrbb_t b);
int rrbb_get_descram_state (rrbb_t b);
int rrbb_get_prev_descram (rrbb_t b);


#endif