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annotate mgw/dtmf_ctrl.c @ 170:a6eb2de277f6

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mgw: massive simplification for continuous RTP stream from BTS
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 20 Nov 2022 01:58:47 -0800
parents 529906fddcfa
children 0047c4c08d9e
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1 /*
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2 * In this module we implement start/stop control of DTMF generation
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3 * toward PSTN on GSM-to-PSTN gateway endpoints.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <sys/socket.h>
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8 #include <sys/time.h>
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9 #include <netinet/in.h>
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10 #include <stdio.h>
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11 #include <stdint.h>
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12 #include <stdlib.h>
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13 #include <string.h>
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14 #include <strings.h>
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15 #include <syslog.h>
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16 #include "../include/tmgw_ctrl.h"
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17 #include "../include/tmgw_const.h"
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18 #include "struct.h"
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19 #include "int_defs.h"
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20 #include "dtmf_defs.h"
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21
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22 extern struct endpoint *find_ep_by_id();
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23
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24 extern struct dtmf_desc dtmf_table[];
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25
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26 void
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27 process_dtmf_start(conn, req, resp)
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28 struct ctrl_conn *conn;
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29 struct tmgw_ctrl_req *req;
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30 struct tmgw_ctrl_resp *resp;
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31 {
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32 struct endpoint *ep;
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33 struct dtmf_desc *desc;
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34
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35 ep = find_ep_by_id(conn, req->ep_id);
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36 if (!ep) {
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37 protocol_err: resp->res = TMGW_RESP_ERR_PROT;
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38 return;
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39 }
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40 if (ep->ep_type != TMGW_EP_TYPE_GATEWAY)
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41 goto protocol_err;
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42 if (!(ep->fwd_mode & TMGW_FWD_ENABLE_GSM2PSTN))
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43 goto protocol_err;
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44 for (desc = dtmf_table; desc->digit; desc++)
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45 if (desc->digit == req->fwd_mode)
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46 break;
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47 if (!desc->digit) {
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48 resp->res = TMGW_RESP_ERR_PARAM;
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49 return;
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50 }
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51 if (ep->dtmf_sample_ptr) {
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52 resp->res = TMGW_RESP_ERR_BUSY;
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53 return;
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54 }
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55 /* start it */
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56 ep->dtmf_sample_ptr = desc->samples;
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57 ep->dtmf_frames_sent = 0;
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58 /* return success */
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59 resp->res = TMGW_RESP_OK;
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60 }
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61
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62 void
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63 process_dtmf_stop(conn, req, resp)
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64 struct ctrl_conn *conn;
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65 struct tmgw_ctrl_req *req;
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66 struct tmgw_ctrl_resp *resp;
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67 {
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68 struct endpoint *ep;
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69
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70 ep = find_ep_by_id(conn, req->ep_id);
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71 if (!ep) {
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72 protocol_err: resp->res = TMGW_RESP_ERR_PROT;
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73 return;
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74 }
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75 if (ep->ep_type != TMGW_EP_TYPE_GATEWAY)
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76 goto protocol_err;
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77 ep->dtmf_sample_ptr = 0;
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78 resp->res = TMGW_RESP_OK;
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79 }