tty.h

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/* this contribution for the legitimate purpose of the 3GPP2.        */
/* Copying this contribution for monetary gain or other non-3GPP2    */
/* purpose is prohibited.                                            */
/*                                                                   */
/*-------------------------------------------------------------------*/


#ifndef _TTY_H_
#define _TTY_H_

#include <stdio.h>
#include "typedef_fx.h"
#include "tty_hdr.h"

#define TTY_VERSION     "SMV TTY 31 Aug 2001"


/* Thresholds for get_tty_bit() and get_tty_char() */

#define MIN_BIT_LEN         8   /* min # of dits, good and bad, to make a bit */
#define MAX_BIT_LEN         13  /* max # of dits, good and bad, to make a bit */

#define DITBUF_LEN          MAX_BIT_LEN+DITS_PER_FRAME+1

#define TTY_DISABLED        0
#define TTY_NO_GAIN         1
#define TTY_AUDIO_DET       2

#define TTY_BIT_HIST_LEN    9
#define MEM_BIT_IDX         0
#define START_BIT_IDX       1
#define STOP_BIT_IDX        7

#define START_BIT           0
#define STOP_BIT            1
#define BAUDOT_GAIN         8192
#define START_BIT_LEN       176
#define DATA_BIT_LEN        176
#define STOP_BIT_LEN        (2*DATA_BIT_LEN)
#define TTY_CHAR_LEN        (START_BIT_LEN+5*DATA_BIT_LEN+STOP_BIT_LEN)

#define NUM_TTY_RATES           2
#define TTY_45_BAUD             0
#define TTY_50_BAUD             1
#define DEFAULT_TTY_BAUD_RATE   TTY_45_BAUD

#define BIT_LEN_45_BAUD         11      /* # dits in a 50 Baud TTY bit */
#define DATA_BIT_LEN_45_BAUD    176
#define STOP_BIT_LEN_45_BAUD    ((3*DATA_BIT_LEN_45_BAUD) >> 1 )

#define BIT_LEN_50_BAUD         10      /* # dits in a 50 Baud TTY bit */
#define DATA_BIT_LEN_50_BAUD    160
#define STOP_BIT_LEN_50_BAUD    280 /* 1.75 bits for stop bit */

#define MARK_HOLD_BIT       1
#define MARK_HOLD_LEN       2400    /* 300 ms. */

#define DEFAULT_DATA_BIT_LEN    DATA_BIT_LEN_45_BAUD
#define DEFAULT_STOP_BIT_LEN    STOP_BIT_LEN_45_BAUD



#define MARK_FREQ               0x3A1C  /* Q14 2*cos(w) 1400 Hz */
#define SPACE_FREQ              0x1406  /* Q14 2*cos(w) 1800 Hz */

/* Define dit values */
#define LOGIC_0         0
#define LOGIC_1         1
#define SILENCE         2
#define ERASE           3
#define UNKNOWN         4 /*NON_TTY*/
#define START_BIT_VAL   LOGIC_0
#define STOP_BIT_VAL    LOGIC_1


/* Define values that can be used in char_counter and tty_char */
#define TTY_CHAR_MIN            0
#define TTY_CHAR_MAX            31

/* TTY states */
#define NON_TTY_MODE            1
#define TTY_MODE_NOT_FRAMED     2
#define TTY_MODE_FRAMED         4

#ifndef PI
#define PI              3.14159265358979323846
#endif

#ifndef MAX
#define MAX(x,y)    (((x)>(y))?(x):(y))
#endif

#ifndef MIN
#define MIN(x,y)    (((x)<(y))?(x):(y))
#endif

/*** TTY Globals ***/
extern Word16   tty_option;
extern Word16   tty_enc_flag;
extern Word16   tty_enc_header;
extern Word16   tty_enc_char;
extern Word16   tty_enc_baud_rate;
extern Word16   tty_dec_flag;
extern Word16   tty_dec_header;
extern Word16   tty_dec_char;
extern Word16   tty_dec_baud_rate;
extern Word16   data_flag;
extern Word16   speech_data_flag;

extern void init_tty_enc(
    Word16   *tty_char,
    Word16   *counter,
    Word16   *tty_baud_rate
);

extern Word16 tty_enc(
    Word16   *tty_char,      /* (o): tty character           */
    Word16   *counter,       /* (o): tty character counter   */
    Word16   *tty_baud_rate, /* (i/o): prev/new character counter    */
    Word16   pcm_buf[],      /* (i): input pcm               */
    Word16   len             /* (i): length of pcm buffer (FRAMESIZE)    */
);

extern void init_dit_to_ascii();

extern void dit_to_ascii(
    Word16   *tty_char,      /* (i/o): prev/new character decision   */
    Word16   *char_counter,  /* (i/o): prev/new character counter    */
    Word16   *tty_baud_rate, /* (i/o): prev/new character counter    */
    Word16   ditInbuf[]      /* (i): dits for current frame          */
);

extern void get_tty_state(
    Word16   *ttyState,              /* (i/o): TTY State                 */
    Word16   first_tty_char_flag,    /* (i): first char detected flag    */
    Word16   tty_bit_hist[],         /* (i): TTY bit history buffer        */
    Word16   tty_bit_len_hist[]      /* (i): TTY bit length history buffer */
);

extern void init_get_tty_bit();

extern Word16 get_tty_bit(
    Word16   tty_bit_hist[],         /* (i/o): bit decision          */
    Word16   tty_bit_len_hist[],     /* (i/o): bit length            */
    Word16   *bit_index,             /* (o): bit index in ditbuf     */
    Word16   *inbuf,                 /* (i/o): dit buffer            */
    Word16   baud_rate               /* (i): baud_rate               */
);

extern Word16 get_tty_char(
    Word16   *tty_char,              /* (o): TTY character               */
    Word16   tty_bit_hist[],         /* (i): TTY bit history buffer      */
    Word16   tty_bit_len_hist[]      /* (i): TTY bit length history buffer */
);

extern void init_baudot_to_dit();

extern void baudot_to_dit(
    Word16    ditbuf[],              /* (o): Dit decisions           */
    Word16    inbuf[]                /* (i): Input PCM               */
);

extern void init_tty_dec();

extern Word16 tty_dec(
    Word16   buf[],
    Word16   acb_gain,
    Word16   counter,
    Word16   tty_char,
    Word16   tty_baud_rate,
    Word16   fer_flag,
    Word16   subframe,
    Word16   num_subfr,
    Word16   length
);

extern void init_tty_gen(
    Word16 counter,
    Word16 tty_char,
    Word16 tty_baud_rate
);

extern Word16 tty_gen(
    Word16   outbuf[],
    Word16   length,
    Word16   subframe,
    Word16   num_subfr,
    Word16   counter_hist[],
    Word16   char_hist[],
    Word16   tty_rate_hist[]
);

extern void tone_gen(
    Word16       outbuf[],
    Word16       freq,
    Word16       volume,
    Word16       len,           
    Word16       param[]);

extern void init_tone_gen(
    Word16       param[],        /* (o) tone generation parameters       */
    Word16       freq );         /* (i) Desired freq in Hz               */

extern void tty_rate(
    Word16   *tty_baud_rate,     /* (i/o): prev/new tty baud rate    */
    Word16   tty_bit_len_hist[]  /* (i): bit len buffer              */
);

extern void tty_header_in(Word16 *counter);
extern void tty_header_out(Word16 *counter);

#endif /* _TTY_H_ */