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comparison tone-detect/g711-tone-detect.c @ 9:ff535725e01f

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g711-tone-detect program written
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 07 Mar 2024 00:05:44 -0800
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8:eaf0e8f81a22 9:ff535725e01f
1 /*
2 * This program reads a G.711 sample stream recording (typically extracted
3 * from an RTP stream pcap with rtp-g711-extr by the same author) and feeds
4 * it to SpanDSP modem connection tone detector.
5 */
6
7 #include <stdio.h>
8 #include <stdint.h>
9 #include <stdlib.h>
10 #include <string.h>
11 #include <strings.h>
12 #include <spandsp.h>
13 #include "../include/pstn_defs.h"
14
15 static char *data_filename;
16 static int use_alaw, tone_type_sought;
17 static g711_state_t *g711_dec_state;
18 static modem_connect_tones_rx_state_t *tones_rx_state;
19 static unsigned frame_count;
20
21 static void report_func(void *user_data, int code, int level, int delay)
22 {
23 printf("@%u.%03us: %s\n", frame_count / 50, (frame_count % 50) * 20,
24 modem_connect_tone_to_str(code));
25 }
26
27 main(argc, argv)
28 char **argv;
29 {
30 FILE *inf;
31 uint8_t g711_buf[FRAME_20MS];
32 int16_t linear[FRAME_20MS];
33 int cc;
34
35 switch (argc) {
36 case 3:
37 data_filename = argv[1];
38 tone_type_sought = atoi(argv[2]);
39 break;
40 case 4:
41 data_filename = argv[1];
42 if (strcmp(argv[2], "alaw"))
43 goto usage;
44 use_alaw = 1;
45 tone_type_sought = atoi(argv[3]);
46 break;
47 default:
48 usage:
49 fprintf(stderr,
50 "usage: %s data-filename [alaw] tone-type-code\n",
51 argv[0]);
52 exit(1);
53 }
54 inf = fopen(data_filename, "r");
55 if (!inf) {
56 perror(data_filename);
57 exit(1);
58 }
59 g711_dec_state = g711_init(NULL, use_alaw ? G711_ALAW : G711_ULAW);
60 if (!g711_dec_state) {
61 fprintf(stderr, "error: g711_init() failed!\n");
62 exit(1);
63 }
64 tones_rx_state = modem_connect_tones_rx_init(NULL, tone_type_sought,
65 report_func, NULL);
66 if (!tones_rx_state) {
67 fprintf(stderr,
68 "error: modem_connect_tones_rx_init() failed!\n");
69 exit(1);
70 }
71 for (frame_count = 0; ; frame_count++) {
72 cc = fread(g711_buf, 1, FRAME_20MS, inf);
73 if (cc == 0)
74 break;
75 g711_decode(g711_dec_state, linear, g711_buf, cc);
76 modem_connect_tones_rx(tones_rx_state, linear, cc);
77 }
78 exit(0);
79 }