v34priv.h

Linmodem is soft modem source code for embedded system

#ifndef V34PRIV_H
#define V34PRIV_H

#define MAX_MAPPING_FRAME_SIZE 79
#define M_MAX 18

/* symbol rate */
enum {
  V34_S2400,
  V34_S2743,
  V34_S2800,
  V34_S3000,
  V34_S3200,
  V34_S3429,
};

/* constellation parameters */
#define L_MAX 1664   /* max number of points in the constellation */
#define C_MIN   -11
#define C_MAX   11
#define C_MAX_SIZE ((C_MAX-C_MIN+1)*(C_MAX-C_MIN+1))
#define C_RADIUS (2*(C_MAX-C_MIN)+1) /* max coordinate of the constellation */
#define SYNC_PATTERN 0x77FA /* (table 12) synchronisation pattern for J=8 */

#define V34_SAMPLE_RATE_NUM 10
#define V34_SAMPLE_RATE_DEN 3
#define V34_SAMPLE_RATE ((2400*V34_SAMPLE_RATE_NUM)/V34_SAMPLE_RATE_DEN)

/* size of the raised root cosine filter (for both rx & tx) */
#define RC_FILTER_SIZE 40

#define TX_BUF_SIZE (2048)

#define RX_BUF1_SIZE   256
#define RX_BUF2_SIZE   256

/* size of the complex equalizer filter */
#define EQ_FRAC        3
#define EQ_SIZE        (52*EQ_FRAC)

#define AGC_WINDOW_SIZE 512 /* must be a power of two, in input samples */

#define TRELLIS_MAX_STATES 64
/* 5 times the constraint length */
#define TRELLIS_LENGTH (6*5)

/* 10 fractional bits for nyquist filters */
#define NQ_BITS 10
#define NQ_BASE (1 << NQ_BITS)

/* state of the signal processing part of the V34 transmitter */
typedef struct V34DSPState {
  /* V34 parameters */
  int calling; /* true if we are the caller */ 
  int S; /* index for symbol rate */
  int expanded_shape; /* true if expanded shape used */
  int R; /* transmit rate (in bits/s, including aux channel) */
  int conv_nb_states; /* number of states of the convolutional coder */
  int use_non_linear;
  int use_high_carrier;
  s16 h[3][2]; /* precoding coefficients (14 bits fractional part) */

    void *opaque;
    get_bit_func get_bit;  
    
    put_bit_func put_bit;  
  
  /* do not modify after this */

  int N; /* total number of bits in a data frame */
  int W; /* number of aux bits in a data frame (0 = no aux channel) */
  int J; /* number of data frame in a super frame */
  int P; /* number of mapping frame in a data frame */
  int b; /* max length of a mapping frame */
  int r; /* counter to know the length of the mapping frame */
  int K; /* mapping parameters */
  int q;
  int L; /* current number of points of the constellation */
  int M; /* current number of rings */ 
  int Z_1; /* previous Z value (see