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/*

 *

  Copyright (c) Eicon Networks, 2002.

 *

  This source file is supplied for the use with

  Eicon Networks range of DIVA Server Adapters.

 *

  Eicon File Revision :    2.1

 *

  This program is free software; you can redistribute it and/or modify

  it under the terms of the GNU General Public License as published by

  the Free Software Foundation; either version 2, or (at your option)

  any later version.

 *

  This program is distributed in the hope that it will be useful,

  but WITHOUT ANY WARRANTY OF ANY KIND WHATSOEVER INCLUDING ANY

  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

  See the GNU General Public License for more details.

 *

  You should have received a copy of the GNU General Public License

  along with this program; if not, write to the Free Software

  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 *

 */

#ifndef CAPIDTMF_H_  

#define CAPIDTMF_H_

/*---------------------------------------------------------------------------*/

/*---------------------------------------------------------------------------*/

#define CAPIDTMF_TONE_GROUP_COUNT            2

#define CAPIDTMF_LOW_GROUP_FREQUENCIES       4

#define CAPIDTMF_HIGH_GROUP_FREQUENCIES      4

#define DSPDTMF_RX_SENSITIVITY_LOW_DEFAULT      50      /* -52 dBm */

#define DSPDTMF_RX_SENSITIVITY_HIGH_DEFAULT     50      /* -52 dBm */

#define DSPDTMF_RX_HIGH_EXCEEDING_LOW_DEFAULT   10      /* dB */

#define DSPDTMF_RX_LOW_EXCEEDING_HIGH_DEFAULT   10      /* dB */

#define DSPDTMF_RX_HARMONICS_SEL_DEFAULT        12      /* dB */

#define CAPIDTMF_RECV_BASE_FREQUENCY_COUNT   (CAPIDTMF_LOW_GROUP_FREQUENCIES + CAPIDTMF_HIGH_GROUP_FREQUENCIES)

#define CAPIDTMF_RECV_GUARD_FREQUENCY_COUNT  8

#define CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT  (CAPIDTMF_RECV_BASE_FREQUENCY_COUNT + CAPIDTMF_RECV_GUARD_FREQUENCY_COUNT)

#define CAPIDTMF_RECV_POSITIVE_COEFF_COUNT   16

#define CAPIDTMF_RECV_NEGATIVE_COEFF_COUNT   (CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT - CAPIDTMF_RECV_POSITIVE_COEFF_COUNT)

#define CAPIDTMF_RECV_ACCUMULATE_CYCLES      205

#define CAPIDTMF_RECV_FUNDAMENTAL_OFFSET     (0xff35L * 2)

#define CAPIDTMF_RECV_FUNDAMENTAL_DECREMENT  (0x0028L * 2)

#define CAPIDTMF_RECV_DIGIT_BUFFER_SIZE      32

#define CAPIDTMF_RECV_STATE_IDLE             0x00

#define CAPIDTMF_RECV_STATE_DTMF_ACTIVE      0x01

typedef struct tag_capidtmf_recv_state

{

  byte digit_buffer[CAPIDTMF_RECV_DIGIT_BUFFER_SIZE];

  word digit_write_pos;

  word digit_read_pos;

  word indication_state;

  word indication_state_ack;

  long goertzel_buffer[2][CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT];

  word min_gap_duration;

  word min_digit_duration;

  word cycle_counter;

  word current_digit_on_time;

  word current_digit_off_time;

  byte current_digit_value;

  byte state;

} t_capidtmf_recv_state;

typedef struct tag_capidtmf_state

{

  byte ulaw;

  t_capidtmf_recv_state recv;

} t_capidtmf_state;

word capidtmf_recv_indication (t_capidtmf_state   *p_state, byte *buffer);

void capidtmf_recv_block (t_capidtmf_state   *p_state, byte   *buffer, word length);

void capidtmf_init (t_capidtmf_state   *p_state, byte ulaw);

void capidtmf_recv_enable (t_capidtmf_state   *p_state, word min_digit_duration, word min_gap_duration);

void capidtmf_recv_disable (t_capidtmf_state   *p_state);

#define capidtmf_indication(p_state,buffer)  (((p_state)->recv.indication_state != (p_state)->recv.indication_state_ack) ?    capidtmf_recv_indication (p_state, buffer) : 0)

#define capidtmf_recv_process_block(p_state,buffer,length)  { if ((p_state)->recv.state != CAPIDTMF_RECV_STATE_IDLE) capidtmf_recv_block (p_state, buffer, length); }

/*---------------------------------------------------------------------------*/

/*---------------------------------------------------------------------------*/

#endif