80 lines
3.6 KiB
C
80 lines
3.6 KiB
C
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/*
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*
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Copyright (c) Eicon Networks, 2002.
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*
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This source file is supplied for the use with
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Eicon Networks range of DIVA Server Adapters.
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*
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Eicon File Revision : 2.1
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*
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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*
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY OF ANY KIND WHATSOEVER INCLUDING ANY
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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*
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#ifndef CAPIDTMF_H_
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#define CAPIDTMF_H_
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/*---------------------------------------------------------------------------*/
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/*---------------------------------------------------------------------------*/
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#define CAPIDTMF_TONE_GROUP_COUNT 2
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#define CAPIDTMF_LOW_GROUP_FREQUENCIES 4
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#define CAPIDTMF_HIGH_GROUP_FREQUENCIES 4
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#define DSPDTMF_RX_SENSITIVITY_LOW_DEFAULT 50 /* -52 dBm */
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#define DSPDTMF_RX_SENSITIVITY_HIGH_DEFAULT 50 /* -52 dBm */
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#define DSPDTMF_RX_HIGH_EXCEEDING_LOW_DEFAULT 10 /* dB */
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#define DSPDTMF_RX_LOW_EXCEEDING_HIGH_DEFAULT 10 /* dB */
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#define DSPDTMF_RX_HARMONICS_SEL_DEFAULT 12 /* dB */
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#define CAPIDTMF_RECV_BASE_FREQUENCY_COUNT (CAPIDTMF_LOW_GROUP_FREQUENCIES + CAPIDTMF_HIGH_GROUP_FREQUENCIES)
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#define CAPIDTMF_RECV_GUARD_FREQUENCY_COUNT 8
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#define CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT (CAPIDTMF_RECV_BASE_FREQUENCY_COUNT + CAPIDTMF_RECV_GUARD_FREQUENCY_COUNT)
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#define CAPIDTMF_RECV_POSITIVE_COEFF_COUNT 16
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#define CAPIDTMF_RECV_NEGATIVE_COEFF_COUNT (CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT - CAPIDTMF_RECV_POSITIVE_COEFF_COUNT)
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#define CAPIDTMF_RECV_ACCUMULATE_CYCLES 205
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#define CAPIDTMF_RECV_FUNDAMENTAL_OFFSET (0xff35L * 2)
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#define CAPIDTMF_RECV_FUNDAMENTAL_DECREMENT (0x0028L * 2)
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#define CAPIDTMF_RECV_DIGIT_BUFFER_SIZE 32
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#define CAPIDTMF_RECV_STATE_IDLE 0x00
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#define CAPIDTMF_RECV_STATE_DTMF_ACTIVE 0x01
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typedef struct tag_capidtmf_recv_state
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{
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byte digit_buffer[CAPIDTMF_RECV_DIGIT_BUFFER_SIZE];
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word digit_write_pos;
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word digit_read_pos;
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word indication_state;
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word indication_state_ack;
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long goertzel_buffer[2][CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT];
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word min_gap_duration;
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word min_digit_duration;
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word cycle_counter;
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word current_digit_on_time;
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word current_digit_off_time;
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byte current_digit_value;
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byte state;
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} t_capidtmf_recv_state;
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typedef struct tag_capidtmf_state
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{
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byte ulaw;
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t_capidtmf_recv_state recv;
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} t_capidtmf_state;
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word capidtmf_recv_indication (t_capidtmf_state *p_state, byte *buffer);
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void capidtmf_recv_block (t_capidtmf_state *p_state, byte *buffer, word length);
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void capidtmf_init (t_capidtmf_state *p_state, byte ulaw);
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void capidtmf_recv_enable (t_capidtmf_state *p_state, word min_digit_duration, word min_gap_duration);
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void capidtmf_recv_disable (t_capidtmf_state *p_state);
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#define capidtmf_indication(p_state,buffer) (((p_state)->recv.indication_state != (p_state)->recv.indication_state_ack) ? capidtmf_recv_indication (p_state, buffer) : 0)
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#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); }
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/*---------------------------------------------------------------------------*/
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/*---------------------------------------------------------------------------*/
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#endif
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