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annotate mgw/dtmf_timer.c @ 127:f062c32a5116

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mgw: implement DTMF
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 01 Oct 2022 20:31:15 -0800
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children 529906fddcfa
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127
f062c32a5116 mgw: implement DTMF
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * In this module we implement the timer function of DTMF generation.
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3 */
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4
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5 #include <sys/types.h>
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6 #include <sys/socket.h>
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7 #include <sys/time.h>
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8 #include <netinet/in.h>
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9 #include <stdio.h>
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10 #include <stdint.h>
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11 #include <stdlib.h>
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12 #include <string.h>
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13 #include <strings.h>
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14 #include <syslog.h>
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15 #include "struct.h"
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16 #include "int_defs.h"
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17 #include "dtmf_defs.h"
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18
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19 extern struct timeval cur_event_time;
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20 extern struct endpoint *dtmf_list_head;
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21
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22 int dtmf_timer_running;
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23 struct timeval dtmf_next_time;
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24
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25 void
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26 start_dtmf_timer()
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27 {
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28 if (dtmf_timer_running)
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29 return;
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30 dtmf_next_time = cur_event_time;
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31 dtmf_timer_running = 1;
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32 }
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33
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34 dtmf_timer_one(ep)
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35 struct endpoint *ep;
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36 {
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37 struct rtp_packet pkt;
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38 socklen_t addrlen;
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39 unsigned frame_limit;
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40
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41 pkt.v_p_x_cc = 0x80;
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42 pkt.m_pt = ep->pstn_payload_type;
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43 if (ep->dtmf_m_bit) {
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44 pkt.m_pt |= 0x80;
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45 ep->dtmf_m_bit = 0;
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46 }
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47 pkt.seq = htons(++ep->g2p_out_seq);
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48 ep->dtmf_last_ts += SAMPLES_PER_FRAME;
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49 pkt.tstamp = htonl(ep->dtmf_last_ts);
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50 pkt.ssrc = ep->g2p_ssrc;
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51 g711_encode_frame(ep->dtmf_sample_ptr, pkt.payload,
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52 ep->pstn_payload_type);
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53 ep->dtmf_sample_ptr += SAMPLES_PER_FRAME;
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54 addrlen = sizeof(struct sockaddr_in);
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55 sendto(ep->rtp_pstn.rtp_fd, &pkt, RTP_PACKET_SIZE_PSTN, 0,
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56 (struct sockaddr *) &ep->rtp_pstn.remote_addr, addrlen);
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57 ep->dtmf_frames_sent++;
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58 frame_limit = ep->dtmf_stop_req ? DTMF_MIN_FRAMES : DTMF_MAX_FRAMES;
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59 if (ep->dtmf_frames_sent >= frame_limit)
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60 return 1;
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61 else
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62 return 0;
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63 }
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64
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65 void
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66 dtmf_timer_process()
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67 {
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68 struct endpoint *ep;
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69 int fin;
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70
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71 for (ep = dtmf_list_head; ep; ep = ep->dtmf_next) {
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72 fin = dtmf_timer_one(ep);
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73 if (!fin)
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74 continue;
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75 ep->dtmf_aftermath = 1;
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76 *ep->dtmf_pp = ep->dtmf_next;
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77 if (ep->dtmf_next)
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78 ep->dtmf_next->dtmf_pp = ep->dtmf_pp;
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79 ep->dtmf_pp = 0;
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80 ep->dtmf_next = 0;
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81 }
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82 if (dtmf_list_head) {
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83 dtmf_next_time.tv_usec += 20000;
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84 if (dtmf_next_time.tv_usec >= 1000000) {
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85 dtmf_next_time.tv_usec -= 1000000;
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86 dtmf_next_time.tv_sec++;
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87 }
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88 } else
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89 dtmf_timer_running = 0;
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90 }