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rtcp.c
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rtcp.c
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/**
RTCP protocol
Copyright (C) 2016-2024 Michele Campus <michelecampus5@gmail.com>
This file is part of decoder.
[ The headers in this module follow the RFC 5246
and the pcap analyzed to have a real conformity
from theory and real traffic ]
decoder is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.
decoder is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
decoder. If not, see <http://www.gnu.org/licenses/>.
**/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include <byteswap.h>
#include "rtcp.h"
int check_rtcp_version (char *packet, int len) {
if(packet == NULL || len == 0) return -1;
rtcp_header_t *rtcp = (rtcp_header_t *)packet;
if(rtcp->version != 2)
{
fprintf(stderr, "wrong version\n");
return -2;
}
if(rtcp->type < RTCP_SR && rtcp->type > RTCP_XR) {
return -3;
}
return 1;
}
int rtcp_parser(char *packet, int len, char *json_buffer, int buffer_len) {
if(packet == NULL || len == 0) return -1;
rtcp_header_t *rtcp = (rtcp_header_t *)packet;
int ret = 0, is_xr = 0;
char *rptr;
// build the JSON buffer
ret += snprintf(json_buffer, buffer_len, "{ ");
int pno = 0, total = len;
while(rtcp) {
pno++;
switch(rtcp->type) {
case RTCP_SR: {
/* SR, sender report */
/* LDEBUG("#%d SR (200)\n", pno); */
printf("#%d SR (200)\n", pno);
rtcp_sr_t *sr = (rtcp_sr_t*)rtcp;
ret += snprintf(json_buffer + ret, buffer_len - ret, SENDER_REPORT_JSON,
sender_info_get_ntp_timestamp_msw(&sr->si),
sender_info_get_ntp_timestamp_lsw(&sr->si),
sender_info_get_octet_count(&sr->si),
sender_info_get_rtp_timestamp(&sr->si),
sender_info_get_packet_count(&sr->si));
if(sr->header.rc > 0) {
ret += snprintf(json_buffer + ret, buffer_len - ret, REPORT_BLOCK_JSON,
ntohl(sr->ssrc), rtcp->type,
report_block_get_ssrc(&sr->rb[0]),
report_block_get_high_ext_seq(&sr->rb[0]),
report_block_get_fraction_lost(&sr->rb[0]),
report_block_get_interarrival_jitter(&sr->rb[0]),
report_block_get_cum_packet_loss(&sr->rb[0]),
report_block_get_last_SR_time(&sr->rb[0]),
report_block_get_last_SR_delay(&sr->rb[0]));
}
break;
}
case RTCP_RR: {
/* RR, receiver report */
/* LDEBUG("#%d RR (201)\n", pno); */
printf("#%d RR (201)\n", pno);
rtcp_rr_t *rr = (rtcp_rr_t*)rtcp;
if(rr->header.rc > 0) {
ret += snprintf(json_buffer+ret, buffer_len - ret, REPORT_BLOCK_JSON,
ntohl(rr->ssrc), rtcp->type,
report_block_get_ssrc(&rr->rb[0]),
report_block_get_high_ext_seq(&rr->rb[0]),
report_block_get_fraction_lost(&rr->rb[0]),
report_block_get_interarrival_jitter(&rr->rb[0]),
report_block_get_cum_packet_loss(&rr->rb[0]),
report_block_get_last_SR_time(&rr->rb[0]),
report_block_get_last_SR_delay(&rr->rb[0]));
}
break;
}
case RTCP_SDES: {
/* LDEBUG("#%d SDES (202)\n", pno); */
printf("#%d SDES (202)\n", pno);
/* if not needed send sdes */
/* if(!send_sdes) break; */
rtcp_sdes_t *sdes = (rtcp_sdes_t*)rtcp;
rptr = rtcp + 2;
int sdes_report_count = 0;
char *end = (char*) rptr + (4*(rtcp_header_get_length(&sdes->header) + 1) -15);
ret += snprintf(json_buffer+ret, buffer_len - ret, SDES_REPORT_BEGIN_JSON, ntohl(sdes->ssrc), sdes_chunk_get_csrc(&sdes->chunk));
while(rptr < end) {
if (rptr+2<=end) {
uint8_t chunk_type = rptr[0];
uint8_t chunk_len = rptr[1];
if(chunk_len == 0) break;
rptr += 2;
ret += snprintf(json_buffer+ret, buffer_len - ret, SDES_REPORT_INFO_JSON, chunk_type, chunk_len, rptr);
sdes_report_count++;
if (rptr+chunk_len<=end) rptr+=chunk_len;
else break;
}
else {
break;
}
}
/* cut , off */
ret -= 1;
ret += snprintf(json_buffer + ret, buffer_len - ret, SDES_REPORT_END_JSON, sdes_report_count);
break;
}
case RTCP_XR: {
/* LDEBUG("#%d XR (207)\n", pno); */
printf("#%d XR (207)\n", pno);
// set flag
is_xr = 1;
// cast the packet to rtcp-xr
struct rtcp_xr_t *rtcp_xr = (struct rtcp_xr_t *) rtcp;
// start to parse field and create json array
ret += snprintf(json_buffer + ret, buffer_len - ret, EXTENDED_REPORT_JSON,
rtcpxr_header_get_type(&rtcp_xr->xr_header),
rtcpxr_header_get_id(&rtcp_xr->block),
rtcpxr_header_get_loss(&rtcp_xr->block),
rtcpxr_header_discard(&rtcp_xr->block),
rtcpxr_header_burst_rate(&rtcp_xr->block),
rtcpxr_header_gap_rate(&rtcp_xr->block),
rtcpxr_header_burst_duration(&rtcp_xr->block),
rtcpxr_header_gap_duration(&rtcp_xr->block),
rtcpxr_header_round_trip_del(&rtcp_xr->block),
rtcpxr_header_end_sys_delay(&rtcp_xr->block),
rtcpxr_header_signal_lev(&rtcp_xr->block),
rtcpxr_header_noise_lev(&rtcp_xr->block),
rtcpxr_header_RERL(&rtcp_xr->block),
rtcpxr_header_Gmin(&rtcp_xr->block),
rtcpxr_header_Rfact(&rtcp_xr->block),
rtcpxr_header_ext_Rfact(&rtcp_xr->block),
rtcpxr_header_MOS_LQ(&rtcp_xr->block),
rtcpxr_header_MOS_CQ(&rtcp_xr->block),
rtcpxr_header_PLC(&rtcp_xr->block),
rtcpxr_header_JB_adapt(&rtcp_xr->block),
rtcpxr_header_JB_rate(&rtcp_xr->block),
rtcpxr_header_JB_nom(&rtcp_xr->block),
rtcpxr_header_JB_max(&rtcp_xr->block),
rtcpxr_header_JB_abs_max(&rtcp_xr->block));
/* ret -= 1; */
ret += snprintf(json_buffer+ret-1, buffer_len-ret+1, "}");
break;
}
case RTCP_BYE: {
printf("\n#%d GOODBYE (203)\n", pno);
/* ret = 0; */
//rtcp_bye_t *bye = (rtcp_bye_t*)rtcp;
break;
}
case RTCP_APP: {
printf("\n#%d APP (204)\n", pno);
//rtcp_app_t *app = (rtcp_app_t*)rtcp;
break;
}
default:
break;
}
int length = ntohs(rtcp->length);
if(length == 0) {
break;
}
total -= length*4+4;
if(total <= 0) {
/* LDEBUG("End of RTCP packet\n"); */
printf("End of RTCP packet\n");
break;
}
rtcp = (rtcp_header_t *)((uint32_t*)rtcp + (length + 1));
}
/* bad parsed message */
if(ret < 10) return 0;
ret += snprintf(json_buffer+ret-1, buffer_len-ret+1, "}");
if(is_xr == 1) printf("RTCP-XR packet\n");
return ret;
}