FreeCalypso > hg > themwi-system-sw

annotate sip-manual-out/rtp_tx.c @ 192:f8a33603288f

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sip-manual-out: generate outgoing RTP stream with PCM silence
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 17 Mar 2023 13:45:31 -0800
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children a3d71489672f
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f8a33603288f sip-manual-out: generate outgoing RTP stream with PCM silence
Mychaela Falconia <falcon@freecalypso.org>
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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 "../include/tmgw_const.h"
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16 #include "../include/rtp_defs.h"
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17
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18 extern struct sockaddr_in rtp_local_addr, rtp_remote_addr;
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19 extern int rtp_udp_fd, rtcp_udp_fd, pcma_selected;
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20 extern struct timeval cur_event_time;
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21
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22 static uint32_t rtp_ssrc;
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23 static uint32_t rtp_out_ts;
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24 static uint16_t rtp_out_seq;
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25
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26 void
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27 assign_rtpout_ssrc()
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28 {
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29 rtp_ssrc = cur_event_time.tv_sec ^ cur_event_time.tv_usec ^ getpid();
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30 }
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31
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32 void
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33 generate_rtp_packet()
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34 {
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35 struct rtp_packet pkt;
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36 socklen_t addrlen;
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37
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38 pkt.v_p_x_cc = 0x80;
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39 pkt.m_pt = pcma_selected ? PSTN_CODEC_PCMA : PSTN_CODEC_PCMU;
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40 pkt.seq = htons(rtp_out_seq++);
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41 pkt.tstamp = htonl(rtp_out_ts);
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42 rtp_out_ts += 160;
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43 pkt.ssrc = rtp_ssrc;
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44 memset(pkt.payload, pcma_selected ? 0xD5 : 0xFF, RTP_MAX_PAYLOAD);
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45 addrlen = sizeof(struct sockaddr_in);
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46 sendto(rtp_udp_fd, &pkt, RTP_PACKET_SIZE_PSTN, 0,
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47 (struct sockaddr *) &rtp_remote_addr, addrlen);
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48 }