#ifndef _g721_h
#define _g721_h

#ifdef __cplusplus
extern "C" {
#endif

struct g72x_state {
    long yl;    /* Locked or steady state step size multiplier. */
    short yu;   /* Unlocked or non-steady state step size multiplier. */
    short dms;  /* Short term energy estimate. */
    short dml;  /* Long term energy estimate. */
    short ap;   /* Linear weighting coefficient of 'yl' and 'yu'. */
    
    short a[2]; /* Coefficients of pole portion of prediction filter. */
    short b[6]; /* Coefficients of zero portion of prediction filter. */
    short pk[2];    /*
                     * Signs of previous two samples of a partially
                     * reconstructed signal.
                     */
    short dq[6];    /*
                     * Previous 6 samples of the quantized difference
                     * signal represented in an internal floating point
                     * format.
                     */
    short sr[2];    /*
                     * Previous 2 samples of the quantized difference
                     * signal represented in an internal floating point
                     * format.
                     */
    char td;    /* delayed tone detect, new in 1988 version */
};

void
g72x_init_state(struct g72x_state *state_ptr);

int
g721_decoder(int		i,
             struct g72x_state *state_ptr);

#ifdef __cplusplus
}
#endif

#endif