1
2 /*
3 *
4 Copyright (c) Eicon Networks, 2002.
5 *
6 This source file is supplied for the use with
7 Eicon Networks range of DIVA Server Adapters.
8 *
9 Eicon File Revision : 2.1
10 *
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 2, or (at your option)
14 any later version.
15 *
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY OF ANY KIND WHATSOEVER INCLUDING ANY
18 implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
19 See the GNU General Public License for more details.
20 *
21 You should have received a copy of the GNU General Public License
22 along with this program; if not, write to the Free Software
23 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 *
25 */
26 #ifndef CAPIDTMF_H_
27 #define CAPIDTMF_H_
28 /*---------------------------------------------------------------------------*/
29 /*---------------------------------------------------------------------------*/
30 #define CAPIDTMF_TONE_GROUP_COUNT 2
31 #define CAPIDTMF_LOW_GROUP_FREQUENCIES 4
32 #define CAPIDTMF_HIGH_GROUP_FREQUENCIES 4
33 #define DSPDTMF_RX_SENSITIVITY_LOW_DEFAULT 50 /* -52 dBm */
34 #define DSPDTMF_RX_SENSITIVITY_HIGH_DEFAULT 50 /* -52 dBm */
35 #define DSPDTMF_RX_HIGH_EXCEEDING_LOW_DEFAULT 10 /* dB */
36 #define DSPDTMF_RX_LOW_EXCEEDING_HIGH_DEFAULT 10 /* dB */
37 #define DSPDTMF_RX_HARMONICS_SEL_DEFAULT 12 /* dB */
38 #define CAPIDTMF_RECV_BASE_FREQUENCY_COUNT (CAPIDTMF_LOW_GROUP_FREQUENCIES + CAPIDTMF_HIGH_GROUP_FREQUENCIES)
39 #define CAPIDTMF_RECV_GUARD_FREQUENCY_COUNT 8
40 #define CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT (CAPIDTMF_RECV_BASE_FREQUENCY_COUNT + CAPIDTMF_RECV_GUARD_FREQUENCY_COUNT)
41 #define CAPIDTMF_RECV_POSITIVE_COEFF_COUNT 16
42 #define CAPIDTMF_RECV_NEGATIVE_COEFF_COUNT (CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT - CAPIDTMF_RECV_POSITIVE_COEFF_COUNT)
43 #define CAPIDTMF_RECV_ACCUMULATE_CYCLES 205
44 #define CAPIDTMF_RECV_FUNDAMENTAL_OFFSET (0xff35L * 2)
45 #define CAPIDTMF_RECV_FUNDAMENTAL_DECREMENT (0x0028L * 2)
46 #define CAPIDTMF_RECV_DIGIT_BUFFER_SIZE 32
47 #define CAPIDTMF_RECV_STATE_IDLE 0x00
48 #define CAPIDTMF_RECV_STATE_DTMF_ACTIVE 0x01
49 typedef struct tag_capidtmf_recv_state
50 {
51 byte digit_buffer[CAPIDTMF_RECV_DIGIT_BUFFER_SIZE];
52 word digit_write_pos;
53 word digit_read_pos;
54 word indication_state;
55 word indication_state_ack;
56 long goertzel_buffer[2][CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT];
57 word min_gap_duration;
58 word min_digit_duration;
59 word cycle_counter;
60 word current_digit_on_time;
61 word current_digit_off_time;
62 byte current_digit_value;
63 byte state;
64 } t_capidtmf_recv_state;
65 typedef struct tag_capidtmf_state
66 {
67 byte ulaw;
68 t_capidtmf_recv_state recv;
69 } t_capidtmf_state;
70 word capidtmf_recv_indication (t_capidtmf_state *p_state, byte *buffer);
71 void capidtmf_recv_block (t_capidtmf_state *p_state, byte *buffer, word length);
72 void capidtmf_init (t_capidtmf_state *p_state, byte ulaw);
73 void capidtmf_recv_enable (t_capidtmf_state *p_state, word min_digit_duration, word min_gap_duration);
74 void capidtmf_recv_disable (t_capidtmf_state *p_state);
75 #define capidtmf_indication(p_state,buffer) (((p_state)->recv.indication_state != (p_state)->recv.indication_state_ack) ? capidtmf_recv_indication (p_state, buffer) : 0)
76 #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); }
77 /*---------------------------------------------------------------------------*/
78 /*---------------------------------------------------------------------------*/
79 #endif
80
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