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annotate mtctest/rtp_play.c @ 10:395c56969bc4

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mtctest: implement guts of RTP play mechanism
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 09 Jun 2024 04:24:53 +0000
parents
children aa2ba9b432af
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10
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1 /*
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2 * In this module we implement RTP play command, emitting a test sequence
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3 * of encoded speech frames toward the MS.
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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/file.h>
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8 #include <sys/stat.h>
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9 #include <sys/socket.h>
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10 #include <sys/time.h>
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11 #include <netinet/in.h>
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12 #include <arpa/inet.h>
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13 #include <stdio.h>
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14 #include <stdint.h>
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15 #include <stdlib.h>
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16 #include <string.h>
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17 #include <strings.h>
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18 #include <unistd.h>
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19 #include <themwi/rtp/rtp_defs.h>
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20 #include <themwi/rtp/rtp_alloc_simple.h>
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21
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22 extern struct rtp_alloc_simple rtp_info;
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23 extern int got_msc_rtp_info;
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24 extern struct sockaddr_storage msc_rtp_addr;
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25 extern uint8_t rtp_payload_type;
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26 extern struct timeval cur_event_time;
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27
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28 int rtp_play_active;
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29
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30 static uint8_t play_buffer[33*50*30]; /* max 30 s of GSM-FR play */
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31
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32 static uint32_t rtp_ssrc;
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33 static uint32_t rtp_out_ts;
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34 static uint16_t rtp_out_seq;
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35
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36 static unsigned play_frame_len;
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37 static unsigned play_buf_nframes, play_buf_ptr;
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38 static int play_loop;
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39
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40 static void
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41 assign_rtpout_ssrc()
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42 {
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43 rtp_ssrc = cur_event_time.tv_sec ^ cur_event_time.tv_usec ^ getpid();
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44 }
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45
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46 static void
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47 fill_with_play(outbuf)
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48 uint8_t *outbuf;
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49 {
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50 memcpy(outbuf, play_buffer + play_buf_ptr * play_frame_len,
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51 play_frame_len);
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52 play_buf_ptr++;
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53 if (play_buf_ptr < play_buf_nframes)
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54 return;
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55 play_buf_ptr = 0;
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56 if (!play_loop)
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57 rtp_play_active = 0;
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58 }
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59
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60 void
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61 generate_rtp_packet()
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62 {
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63 struct rtp_packet pkt;
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64 socklen_t addrlen;
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65
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66 pkt.v_p_x_cc = 0x80;
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67 pkt.m_pt = rtp_payload_type;
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68 pkt.seq = htons(rtp_out_seq++);
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69 pkt.tstamp = htonl(rtp_out_ts);
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70 rtp_out_ts += 160;
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71 pkt.ssrc = rtp_ssrc;
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72 fill_with_play(pkt.payload);
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73 addrlen = sizeof(struct sockaddr_in);
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74 sendto(rtp_info.gsm_rtp_fd, &pkt, RTP_PACKET_HDR_SIZE + play_frame_len,
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75 0, (struct sockaddr *) &msc_rtp_addr, addrlen);
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76 }
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77
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78 void
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79 play_file_cmdop(filename, frame_len, loop)
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80 unsigned frame_len;
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81 char *filename;
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82 {
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83 int fd;
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84 struct stat st;
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85
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86 if (rtp_play_active) {
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87 fprintf(stderr, "error: file play already in progress\n");
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88 return;
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89 }
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90 if (!got_msc_rtp_info) {
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91 fprintf(stderr, "error: no RTP info received from MSC\n");
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92 return;
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93 }
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94 fd = open(filename, O_RDONLY);
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95 if (fd < 0) {
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96 perror(filename);
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97 return;
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98 }
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99 fstat(fd, &st);
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100 if (!S_ISREG(st.st_mode)) {
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101 close(fd);
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102 fprintf(stderr, "error: %s is not a regular file\n", filename);
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103 return;
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104 }
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105 if (!st.st_size) {
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106 close(fd);
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107 fprintf(stderr, "error: %s is an empty file\n", filename);
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108 return;
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109 }
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110 if (st.st_size % frame_len) {
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111 close(fd);
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112 fprintf(stderr,
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113 "error: size of %s is not a multiple of %u bytes\n",
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114 filename, frame_len);
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115 return;
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116 }
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117 if (st.st_size > sizeof play_buffer) {
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118 close(fd);
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119 fprintf(stderr,
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120 "error: size of %s exceeds compiled-in buffer size\n",
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121 filename);
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122 return;
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123 }
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124 read(fd, play_buffer, st.st_size);
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125 close(fd);
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126 play_buf_nframes = st.st_size / frame_len;
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127 play_buf_ptr = 0;
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128 play_frame_len = frame_len;
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129 play_loop = loop;
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130 assign_rtpout_ssrc();
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131 rtp_out_ts = 0;
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132 rtp_out_seq = 0;
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133 rtp_play_active = 1;
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134 }
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135
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136 void
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137 play_file_stop()
395c56969bc4 mtctest: implement guts of RTP play mechanism
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 {
395c56969bc4 mtctest: implement guts of RTP play mechanism
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 rtp_play_active = 0;
395c56969bc4 mtctest: implement guts of RTP play mechanism
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 }