FreeCalypso > hg > sipout-test-utils

annotate test-fsk/rtp_tx.c @ 7:6d832abad660

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test-fsk: gather and print full line of modem Rx characters
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 05 Mar 2024 10:57:45 -0800
parents 030d52b96a23
children
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1 /*
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2 * In this module we implement outgoing RTP stream 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 <unistd.h>
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15 #include <spandsp.h>
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16 #include "../include/tmgw_const.h"
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17 #include "../include/rtp_defs.h"
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18 #include "../include/pstn_defs.h"
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19 #include "../libutil/osmo_bits.h"
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20
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21 extern struct sockaddr_in rtp_local_addr, rtp_remote_addr;
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22 extern int rtp_udp_fd, rtcp_udp_fd, pcma_selected;
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23 extern struct timeval cur_event_time;
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24 extern int fsk_mode_tx;
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25
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26 static uint32_t rtp_ssrc;
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27 static uint32_t rtp_out_ts;
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28 static uint16_t rtp_out_seq;
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29
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30 static fsk_tx_state_t *fsk_tx_state;
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31 static g711_state_t *g711_enc_state;
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32
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33 void
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34 assign_rtpout_ssrc()
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35 {
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36 rtp_ssrc = cur_event_time.tv_sec ^ cur_event_time.tv_usec ^ getpid();
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37 }
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38
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39 static int
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40 supply_bit()
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41 {
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42 return 1;
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43 }
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44
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45 void
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46 init_pcm_tx()
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47 {
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48 fsk_tx_state = fsk_tx_init(NULL, &preset_fsk_specs[fsk_mode_tx],
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49 supply_bit, NULL);
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50 if (!fsk_tx_state) {
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51 fprintf(stderr, "error: fsk_tx_init() failed!\n");
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52 exit(1);
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53 }
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54 g711_enc_state = g711_init(NULL, pcma_selected ? G711_ALAW : G711_ULAW);
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55 if (!g711_enc_state) {
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56 fprintf(stderr, "error: g711_init() failed!\n");
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57 exit(1);
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58 }
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59 }
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60
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61 void
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62 generate_rtp_packet()
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63 {
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64 struct rtp_packet pkt;
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65 socklen_t addrlen;
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66 int16_t linear[FRAME_20MS];
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67
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68 pkt.v_p_x_cc = 0x80;
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69 pkt.m_pt = pcma_selected ? PSTN_CODEC_PCMA : PSTN_CODEC_PCMU;
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70 pkt.seq = htons(rtp_out_seq++);
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71 pkt.tstamp = htonl(rtp_out_ts);
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72 rtp_out_ts += FRAME_20MS;
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73 pkt.ssrc = rtp_ssrc;
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74 fsk_tx(fsk_tx_state, linear, FRAME_20MS);
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75 g711_encode(g711_enc_state, pkt.payload, linear, FRAME_20MS);
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76 addrlen = sizeof(struct sockaddr_in);
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77 sendto(rtp_udp_fd, &pkt, RTP_PACKET_SIZE_PSTN, 0,
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78 (struct sockaddr *) &rtp_remote_addr, addrlen);
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79 }