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#pragma once
#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);
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