#define V8_SAMPLE_RATE 8000/* V8 tone ANSam tone synthesis */typedef struct {    /* parameters */    int tone_level;    /* internal */    int sample_rate;    int phase, phase_incr;    int mod_phase, mod_phase_incr;    int phase_reverse_samples;    int phase_reverse_left;    int amp;} V8_mod_state;/* ANSam tone detection *//* 25 ms window */#define V8_N  200#define DFT_COEF_2100 ((int)((2100.0 / V8_SAMPLE_RATE * V8_N) + 0.5))typedef struct {    int buf_ptr;    s16 buf[V8_N];    s16 cos_tab[V8_N];    s16 sin_tab[V8_N];    int v8_ANSam_detected; /* true if ANSam detected */} V8_demod_state;/* Te period, as in the V8 spec 500 <= Te  */#define V8_TE 800/* V8 main state */typedef struct {    int calling;   /* true if we are the calling modem */    int state;     /* current state of the V8 protocol */    int debug_laststate;     struct sm_timer v8_start_timer;    struct sm_timer v8_ci_timer;    struct sm_timer v8_connect_timer;    int v8_ci_count;    FSK_mod_state v21_tx;    FSK_demod_state v21_rx;    struct sm_fifo rx_fifo;    struct sm_fifo tx_fifo;    u8 rx_buf[256];    u8 tx_buf[256];    V8_mod_state v8_tx;    V8_demod_state v8_rx;    /* available modulations */    int modulation_mask;    /* V8 data parsing */    unsigned int bit_buf;    unsigned int bit_sync;    int bit_cnt;    int data_state; /* indicates the type of synchro */    u8 rx_data[64];    int rx_data_ptr;        /* CM/JM parsing */    u8 cm_data[64];    int cm_count;    int got_cm;    int decoded_modulations; /* modulation mask decoded from CM/JM */    /* CJ parsing */    int got_cj;    int data_zero_count;    int selected_mod_mask;   /* selected modulation mask */    int selected_modulation; /* see V8_MOD_xxx */} V8State;/* V8 protocol definitions */#define V8_MAX_CI_SEQ 10  /* maximum number of CI packets sent */#define V8_TEN_ONES 0x3ff#define V8_CI_SYNC  0x001#define V8_CM_SYNC  0x00f#define V8_CALL_FUNC_DATA 0x83#define V8_MODN0     0xA0#define V8_EXT       0x08#define V8_MODN0_V90 0x04   /* FIXME */#define V8_MODN0_V34 0x02#define V8_MODN2_V21 0x01#define V8_MODN2_V23 0x20#define V8_DATA_NOCELULAR 0xB0#define V8_DATA_LAPM	  0x54#define V8_MOD_V90 (1 << 0)  /* FIXME */#define V8_MOD_V34 (1 << 1)  /* V34 duplex */#define V8_MOD_V23 (1 << 10) /* V23 duplex */#define V8_MOD_V21 (1 << 12) /* V21 duplex */#define V8_MOD_HANGUP 0x8000 /* indicate hangup */void V8_init(V8State *sm, int calling, int mod_mask);int V8_process(V8State *sm, s16 *output, s16 *input, int nb_samples);