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capidtmf.h

/*
 *
  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  

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