FreeCalypso > hg > themwi-rtp-lib

annotate src/set_sdes.c @ 42:334d883b96ba

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twrtp_jibuf_create: make config argument const While this config structure is not a constant in the mathematical sense of the term (it is expected that vty config changes may happen while twjit instance is alive), twjit functions never write to it, only read, hence it is 'const' in the not-quite-mathematical C-standard sense.
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 20 Dec 2024 22:47:20 +0000
parents 284fcb5868e2
children
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31
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1 /*
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2 * Here we implement the function that prepares the SDES subpacket
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3 * for subsequent RTCP output.
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4 */
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5
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6 #include <stdint.h>
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7 #include <stdbool.h>
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8 #include <string.h>
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9 #include <errno.h>
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10 #include <arpa/inet.h> /* for network byte order functions */
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11
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12 #include <osmocom/core/talloc.h>
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13
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14 #include <themwi/rtp/endp.h>
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15 #include <themwi/rtp/rtcp_defs.h>
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16
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17 int twrtp_endp_set_sdes(struct twrtp_endp *endp, const char *cname,
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18 const char *name, const char *email, const char *phone,
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19 const char *loc, const char *tool, const char *note)
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20 {
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21 uint16_t len_str, len_padded, len_with_hdr, len;
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22 struct rtcp_sr_rr_hdr *hdr;
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23 uint8_t *dp;
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24
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25 if (!cname)
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26 return -EINVAL;
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27 len_str = strlen(cname) + 2;
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28 if (name)
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29 len_str += strlen(name) + 2;
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30 if (email)
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31 len_str += strlen(email) + 2;
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32 if (phone)
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33 len_str += strlen(phone) + 2;
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34 if (loc)
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35 len_str += strlen(loc) + 2;
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36 if (tool)
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37 len_str += strlen(tool) + 2;
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38 if (note)
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39 len_str += strlen(note) + 2;
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40 len_padded = (len_str + 4) & ~3;
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41 len_with_hdr = len_padded + sizeof(struct rtcp_sr_rr_hdr);
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42
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43 if (endp->sdes_buf)
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44 talloc_free(endp->sdes_buf);
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45 endp->sdes_buf = talloc_size(endp, len_with_hdr);
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46 if (!endp->sdes_buf)
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47 return -ENOMEM;
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48
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49 hdr = (struct rtcp_sr_rr_hdr *) endp->sdes_buf;
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50 hdr->v_p_rc = 0x81;
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51 hdr->pt = RTCP_PT_SDES;
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52 hdr->len = htons(len_with_hdr / 4 - 1);
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53 hdr->ssrc = htonl(endp->tx.ssrc);
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54 dp = endp->sdes_buf + sizeof(struct rtcp_sr_rr_hdr);
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55 *dp++ = SDES_ITEM_CNAME;
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56 *dp++ = len = strlen(cname);
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57 memcpy(dp, cname, len);
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58 dp += len;
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59 if (name) {
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60 *dp++ = SDES_ITEM_NAME;
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61 *dp++ = len = strlen(name);
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62 memcpy(dp, name, len);
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63 dp += len;
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64 }
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65 if (email) {
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66 *dp++ = SDES_ITEM_EMAIL;
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67 *dp++ = len = strlen(email);
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68 memcpy(dp, email, len);
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69 dp += len;
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70 }
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71 if (phone) {
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72 *dp++ = SDES_ITEM_PHONE;
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73 *dp++ = len = strlen(phone);
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74 memcpy(dp, phone, len);
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75 dp += len;
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76 }
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77 if (loc) {
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78 *dp++ = SDES_ITEM_LOC;
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79 *dp++ = len = strlen(loc);
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80 memcpy(dp, loc, len);
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81 dp += len;
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82 }
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83 if (tool) {
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84 *dp++ = SDES_ITEM_TOOL;
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85 *dp++ = len = strlen(tool);
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86 memcpy(dp, tool, len);
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87 dp += len;
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88 }
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89 if (note) {
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90 *dp++ = SDES_ITEM_NOTE;
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91 *dp++ = len = strlen(note);
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92 memcpy(dp, note, len);
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93 dp += len;
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94 }
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95 memset(dp, 0, len_padded - len_str);
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96
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97 endp->sdes_len = len_with_hdr;
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98 return 0;
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99 }