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sdp.c
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sdp.c
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/*! \file sdp.c
* \author Lorenzo Miniero <lorenzo@meetecho.com>
* \copyright GNU General Public License v3
* \brief SDP processing
* \details Implementation of an SDP
* parser/merger/generator in the server. Each SDP coming from peers is
* stripped/anonymized before it is passed to the plugins: all
* DTLS/ICE/transport related information is removed, only leaving the
* relevant information in place. SDP coming from plugins is stripped/anonymized
* as well, and merged with the proper DTLS/ICE/transport information before
* it is sent to the peers. The actual SDP processing (parsing SDP strings,
* representation of SDP as an internal format, and so on) is done via
* the tools provided in sdp-utils.h.
*
* \ingroup protocols
* \ref protocols
*/
#include <netdb.h>
#include <gio/gio.h>
#include "janus.h"
#include "ice.h"
#include "sdp.h"
#include "utils.h"
#include "ip-utils.h"
#include "debug.h"
#include "events.h"
/* Pre-parse SDP: is this SDP valid? how many audio/video lines? any features to take into account? */
janus_sdp *janus_sdp_preparse(void *ice_handle, const char *jsep_sdp, char *error_str, size_t errlen,
int *audio, int *video, int *data) {
if(!ice_handle || !jsep_sdp || !audio || !video || !data) {
JANUS_LOG(LOG_ERR, " Can't preparse, invalid arguments\n");
return NULL;
}
janus_ice_handle *handle = (janus_ice_handle *)ice_handle;
janus_sdp *parsed_sdp = janus_sdp_parse(jsep_sdp, error_str, errlen);
if(!parsed_sdp) {
JANUS_LOG(LOG_ERR, " Error parsing SDP? %s\n", error_str ? error_str : "(unknown reason)");
/* Invalid SDP */
return NULL;
}
/* Look for m-lines */
GList *temp = parsed_sdp->m_lines;
while(temp) {
janus_sdp_mline *m = (janus_sdp_mline *)temp->data;
if(m->type == JANUS_SDP_AUDIO) {
*audio = *audio + 1;
} else if(m->type == JANUS_SDP_VIDEO) {
*video = *video + 1;
}
/* Preparse the mid as well, and check if bundle-only is used */
GList *tempA = m->attributes;
while(tempA) {
janus_sdp_attribute *a = (janus_sdp_attribute *)tempA->data;
if(a->name) {
if(!strcasecmp(a->name, "bundle-only") && m->port == 0) {
/* Port 0 but bundle-only is used, don't disable this m-line */
m->port = 9;
} else if(!strcasecmp(a->name, "mid")) {
/* Found mid attribute */
if(a->value == NULL) {
JANUS_LOG(LOG_ERR, "[%"SCNu64"] Invalid mid attribute (no value)\n", handle->handle_id);
janus_sdp_destroy(parsed_sdp);
return NULL;
}
if(m->type == JANUS_SDP_AUDIO && m->port > 0) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Audio mid: %s\n", handle->handle_id, a->value);
if(strlen(a->value) > 16) {
JANUS_LOG(LOG_ERR, "[%"SCNu64"] Audio mid too large: (%zu > 16)\n", handle->handle_id, strlen(a->value));
janus_sdp_destroy(parsed_sdp);
return NULL;
}
if(handle->audio_mid == NULL)
handle->audio_mid = g_strdup(a->value);
if(handle->stream_mid == NULL)
handle->stream_mid = handle->audio_mid;
} else if(m->type == JANUS_SDP_VIDEO && m->port > 0) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Video mid: %s\n", handle->handle_id, a->value);
if(strlen(a->value) > 16) {
JANUS_LOG(LOG_ERR, "[%"SCNu64"] Video mid too large: (%zu > 16)\n", handle->handle_id, strlen(a->value));
janus_sdp_destroy(parsed_sdp);
return NULL;
}
if(handle->video_mid == NULL)
handle->video_mid = g_strdup(a->value);
if(handle->stream_mid == NULL)
handle->stream_mid = handle->video_mid;
}
}
}
/* If the m-line is disabled don't actually increase the count */
if(m->port == 0) {
if(m->type == JANUS_SDP_AUDIO) {
*audio = *audio - 1;
} else if(m->type == JANUS_SDP_VIDEO) {
*video = *video - 1;
}
}
tempA = tempA->next;
}
temp = temp->next;
}
#ifdef HAVE_SCTP
*data = (strstr(jsep_sdp, "DTLS/SCTP") && !strstr(jsep_sdp, " 0 DTLS/SCTP") &&
!strstr(jsep_sdp, " 0 UDP/DTLS/SCTP")) ? 1 : 0; /* FIXME This is a really hacky way of checking... */
#else
*data = 0;
#endif
return parsed_sdp;
}
/* Parse SDP */
int janus_sdp_process(void *ice_handle, janus_sdp *remote_sdp, gboolean rids_hml, gboolean update) {
if(!ice_handle || !remote_sdp)
return -1;
janus_ice_handle *handle = (janus_ice_handle *)ice_handle;
janus_ice_stream *stream = handle->stream;
if(!stream)
return -1;
gchar *ruser = NULL, *rpass = NULL, *rhashing = NULL, *rfingerprint = NULL;
int audio = 0, video = 0;
#ifdef HAVE_SCTP
int data = 0;
#endif
gboolean rtx = FALSE;
/* Ok, let's start with global attributes */
GList *temp = remote_sdp->attributes;
while(temp) {
janus_sdp_attribute *a = (janus_sdp_attribute *)temp->data;
if(a && a->name && a->value) {
if(!strcasecmp(a->name, "fingerprint")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Fingerprint (global) : %s\n", handle->handle_id, a->value);
if(strcasestr(a->value, "sha-256 ") == a->value) {
rhashing = g_strdup("sha-256");
rfingerprint = g_strdup(a->value + strlen("sha-256 "));
} else if(strcasestr(a->value, "sha-1 ") == a->value) {
JANUS_LOG(LOG_WARN, "[%"SCNu64"] Hashing algorithm not the one we expected (sha-1 instead of sha-256), but that's ok\n", handle->handle_id);
rhashing = g_strdup("sha-1");
rfingerprint = g_strdup(a->value + strlen("sha-1 "));
} else {
/* FIXME We should handle this somehow anyway... OpenSSL supports them all */
JANUS_LOG(LOG_WARN, "[%"SCNu64"] Hashing algorithm not the one we expected (sha-256/sha-1), *NOT* cool\n", handle->handle_id);
}
} else if(!strcasecmp(a->name, "ice-ufrag")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] ICE ufrag (global): %s\n", handle->handle_id, a->value);
ruser = g_strdup(a->value);
} else if(!strcasecmp(a->name, "ice-pwd")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] ICE pwd (global): %s\n", handle->handle_id, a->value);
rpass = g_strdup(a->value);
}
}
temp = temp->next;
}
/* Now go on with m-line and their attributes */
int mlines = 0;
temp = remote_sdp->m_lines;
while(temp) {
mlines++;
janus_sdp_mline *m = (janus_sdp_mline *)temp->data;
if(m->type == JANUS_SDP_AUDIO) {
if(handle->rtp_profile == NULL && m->proto != NULL)
handle->rtp_profile = g_strdup(m->proto);
audio++;
if(audio > 1) {
temp = temp->next;
continue;
}
if(m->port > 0) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Parsing audio candidates (stream=%d)...\n", handle->handle_id, stream->stream_id);
if(!janus_flags_is_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_HAS_AUDIO)) {
janus_flags_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_HAS_AUDIO);
stream->audio_ssrc = janus_random_uint32(); /* FIXME Should we look for conflicts? */
if(stream->audio_rtcp_ctx == NULL) {
stream->audio_rtcp_ctx = g_malloc0(sizeof(rtcp_context));
stream->audio_rtcp_ctx->tb = 48000; /* May change later */
}
}
switch(m->direction) {
case JANUS_SDP_INACTIVE:
case JANUS_SDP_INVALID:
stream->audio_send = FALSE;
stream->audio_recv = FALSE;
break;
case JANUS_SDP_SENDONLY:
/* A sendonly peer means recvonly for Janus */
stream->audio_send = FALSE;
stream->audio_recv = TRUE;
break;
case JANUS_SDP_RECVONLY:
/* A recvonly peer means sendonly for Janus */
stream->audio_send = TRUE;
stream->audio_recv = FALSE;
break;
case JANUS_SDP_SENDRECV:
case JANUS_SDP_DEFAULT:
default:
stream->audio_send = TRUE;
stream->audio_recv = TRUE;
break;
}
if(m->ptypes != NULL) {
g_list_free(stream->audio_payload_types);
stream->audio_payload_types = g_list_copy(m->ptypes);
}
} else {
/* Audio rejected? */
janus_flags_clear(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_HAS_AUDIO);
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Audio rejected by peer...\n", handle->handle_id);
}
} else if(m->type == JANUS_SDP_VIDEO) {
if(handle->rtp_profile == NULL && m->proto != NULL)
handle->rtp_profile = g_strdup(m->proto);
video++;
if(video > 1) {
temp = temp->next;
continue;
}
if(m->port > 0) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Parsing video candidates (stream=%d)...\n", handle->handle_id, stream->stream_id);
if(!janus_flags_is_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_HAS_VIDEO)) {
janus_flags_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_HAS_VIDEO);
stream->video_ssrc = janus_random_uint32(); /* FIXME Should we look for conflicts? */
if(stream->video_rtcp_ctx[0] == NULL) {
stream->video_rtcp_ctx[0] = g_malloc0(sizeof(rtcp_context));
stream->video_rtcp_ctx[0]->tb = 90000; /* May change later */
}
}
switch(m->direction) {
case JANUS_SDP_INACTIVE:
case JANUS_SDP_INVALID:
stream->video_send = FALSE;
stream->video_recv = FALSE;
break;
case JANUS_SDP_SENDONLY:
/* A sendonly peer means recvonly for Janus */
stream->video_send = FALSE;
stream->video_recv = TRUE;
break;
case JANUS_SDP_RECVONLY:
/* A recvonly peer means sendonly for Janus */
stream->video_send = TRUE;
stream->video_recv = FALSE;
break;
case JANUS_SDP_SENDRECV:
case JANUS_SDP_DEFAULT:
default:
stream->video_send = TRUE;
stream->video_recv = TRUE;
break;
}
if(m->ptypes != NULL) {
g_list_free(stream->video_payload_types);
stream->video_payload_types = g_list_copy(m->ptypes);
}
} else {
/* Video rejected? */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Video rejected by peer...\n", handle->handle_id);
janus_flags_clear(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_HAS_VIDEO);
}
#ifdef HAVE_SCTP
} else if(m->type == JANUS_SDP_APPLICATION) {
/* Is this SCTP for DataChannels? */
if(!strcasecmp(m->proto, "DTLS/SCTP") || !strcasecmp(m->proto, "UDP/DTLS/SCTP")) {
data++;
if(data > 1) {
temp = temp->next;
continue;
}
if(m->port > 0) {
/* Yep */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Parsing SCTP candidates (stream=%d)...\n", handle->handle_id, stream->stream_id);
if(!janus_flags_is_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_DATA_CHANNELS)) {
janus_flags_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_DATA_CHANNELS);
}
if(!strcasecmp(m->proto, "UDP/DTLS/SCTP")) {
janus_flags_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_NEW_DATACHAN_SDP);
} else {
janus_flags_clear(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_NEW_DATACHAN_SDP);
}
} else {
/* Data channels rejected? */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Data channels rejected by peer...\n", handle->handle_id);
janus_flags_clear(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_DATA_CHANNELS);
janus_flags_clear(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_NEW_DATACHAN_SDP);
}
} else {
/* Unsupported data channels format. */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Data channels format %s unsupported, skipping\n", handle->handle_id, m->proto);
janus_flags_clear(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_DATA_CHANNELS);
janus_flags_clear(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_NEW_DATACHAN_SDP);
}
#endif
} else {
JANUS_LOG(LOG_WARN, "[%"SCNu64"] Skipping disabled/unsupported media line...\n", handle->handle_id);
}
if(stream == NULL) {
temp = temp->next;
continue;
}
/* Look for mid, ICE credentials and fingerprint first: check media attributes */
GList *tempA = m->attributes;
while(tempA) {
janus_sdp_attribute *a = (janus_sdp_attribute *)tempA->data;
if(a->name && a->value) {
if(!strcasecmp(a->name, "mid")) {
/* Found mid attribute */
if(m->type == JANUS_SDP_AUDIO && m->port > 0) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Audio mid: %s\n", handle->handle_id, a->value);
if(strlen(a->value) > 16) {
JANUS_LOG(LOG_ERR, "[%"SCNu64"] Audio mid too large: (%zu > 16)\n", handle->handle_id, strlen(a->value));
return -2;
}
if(handle->audio_mid == NULL)
handle->audio_mid = g_strdup(a->value);
if(handle->stream_mid == NULL)
handle->stream_mid = handle->audio_mid;
} else if(m->type == JANUS_SDP_VIDEO && m->port > 0) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Video mid: %s\n", handle->handle_id, a->value);
if(strlen(a->value) > 16) {
JANUS_LOG(LOG_ERR, "[%"SCNu64"] Video mid too large: (%zu > 16)\n", handle->handle_id, strlen(a->value));
return -2;
}
if(handle->video_mid == NULL)
handle->video_mid = g_strdup(a->value);
if(handle->stream_mid == NULL)
handle->stream_mid = handle->video_mid;
#ifdef HAVE_SCTP
} else if(m->type == JANUS_SDP_APPLICATION) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Data Channel mid: %s\n", handle->handle_id, a->value);
if(handle->data_mid == NULL)
handle->data_mid = g_strdup(a->value);
if(handle->stream_mid == NULL)
handle->stream_mid = handle->data_mid;
#endif
}
} else if(!strcasecmp(a->name, "fingerprint")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Fingerprint (local) : %s\n", handle->handle_id, a->value);
if(strcasestr(a->value, "sha-256 ") == a->value) {
g_free(rhashing); /* FIXME We're overwriting the global one, if any */
rhashing = g_strdup("sha-256");
g_free(rfingerprint); /* FIXME We're overwriting the global one, if any */
rfingerprint = g_strdup(a->value + strlen("sha-256 "));
} else if(strcasestr(a->value, "sha-1 ") == a->value) {
JANUS_LOG(LOG_WARN, "[%"SCNu64"] Hashing algorithm not the one we expected (sha-1 instead of sha-256), but that's ok\n", handle->handle_id);
g_free(rhashing); /* FIXME We're overwriting the global one, if any */
rhashing = g_strdup("sha-1");
g_free(rfingerprint); /* FIXME We're overwriting the global one, if any */
rfingerprint = g_strdup(a->value + strlen("sha-1 "));
} else {
/* FIXME We should handle this somehow anyway... OpenSSL supports them all */
JANUS_LOG(LOG_WARN, "[%"SCNu64"] Hashing algorithm not the one we expected (sha-256), *NOT* cool\n", handle->handle_id);
}
} else if(!strcasecmp(a->name, "setup")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] DTLS setup (local): %s\n", handle->handle_id, a->value);
if(!update) {
if(!strcasecmp(a->value, "actpass") || !strcasecmp(a->value, "passive")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Setting connect state (DTLS client)\n", handle->handle_id);
stream->dtls_role = JANUS_DTLS_ROLE_CLIENT;
} else if(!strcasecmp(a->value, "active")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Setting accept state (DTLS server)\n", handle->handle_id);
stream->dtls_role = JANUS_DTLS_ROLE_SERVER;
}
if(stream->component && stream->component->dtls)
stream->component->dtls->dtls_role = stream->dtls_role;
}
/* TODO Handle holdconn... */
} else if(!strcasecmp(a->name, "ice-ufrag")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] ICE ufrag (local): %s\n", handle->handle_id, a->value);
g_free(ruser); /* FIXME We're overwriting the global one, if any */
ruser = g_strdup(a->value);
} else if(!strcasecmp(a->name, "ice-pwd")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] ICE pwd (local): %s\n", handle->handle_id, a->value);
g_free(rpass); /* FIXME We're overwriting the global one, if any */
rpass = g_strdup(a->value);
}
}
tempA = tempA->next;
}
if(mlines == 1) {
if(!ruser || !rpass || (janus_is_webrtc_encryption_enabled() && (!rfingerprint || !rhashing))) {
/* Missing mandatory information, failure... */
JANUS_LOG(LOG_ERR, "[%"SCNu64"] SDP missing mandatory information\n", handle->handle_id);
JANUS_LOG(LOG_ERR, "[%"SCNu64"] %p, %p, %p, %p\n", handle->handle_id, ruser, rpass, rfingerprint, rhashing);
if(ruser)
g_free(ruser);
ruser = NULL;
if(rpass)
g_free(rpass);
rpass = NULL;
if(rhashing)
g_free(rhashing);
rhashing = NULL;
if(rfingerprint)
g_free(rfingerprint);
rfingerprint = NULL;
return -2;
}
/* If we received the ICE credentials for the first time, enforce them */
if(ruser && !stream->ruser && rpass && !stream->rpass) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Setting remote credentials...\n", handle->handle_id);
if(!nice_agent_set_remote_credentials(handle->agent, handle->stream_id, ruser, rpass)) {
JANUS_LOG(LOG_ERR, "[%"SCNu64"] Failed to set remote credentials!\n", handle->handle_id);
}
} else
/* If this is a renegotiation, check if this is an ICE restart */
if((ruser && stream->ruser && strcmp(ruser, stream->ruser)) ||
(rpass && stream->rpass && strcmp(rpass, stream->rpass))) {
JANUS_LOG(LOG_INFO, "[%"SCNu64"] ICE restart detected\n", handle->handle_id);
janus_flags_clear(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_ALL_TRICKLES);
janus_flags_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_ICE_RESTART);
}
/* Store fingerprint and hashing */
if(janus_is_webrtc_encryption_enabled()) {
g_free(stream->remote_hashing);
stream->remote_hashing = g_strdup(rhashing);
g_free(stream->remote_fingerprint);
stream->remote_fingerprint = g_strdup(rfingerprint);
}
/* Store the ICE username and password for this stream */
g_free(stream->ruser);
stream->ruser = g_strdup(ruser);
g_free(stream->rpass);
stream->rpass = g_strdup(rpass);
}
/* Is simulcasting enabled, using rid? (we need to check this before parsing SSRCs) */
tempA = m->attributes;
stream->rids_hml = rids_hml;
while(tempA) {
janus_sdp_attribute *a = (janus_sdp_attribute *)tempA->data;
if(a->name && !strcasecmp(a->name, "rid") && a->value) {
/* This attribute is used for simulcasting */
char rid[16];
if(sscanf(a->value, "%15s send", rid) != 1) {
JANUS_LOG(LOG_ERR, "[%"SCNu64"] Failed to parse rid attribute...\n", handle->handle_id);
} else {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Parsed rid: %s\n", handle->handle_id, rid);
if(stream->rid[rids_hml ? 2 : 0] == NULL) {
stream->rid[rids_hml ? 2 : 0] = g_strdup(rid);
} else if(stream->rid[1] == NULL) {
stream->rid[1] = g_strdup(rid);
} else if(stream->rid[rids_hml ? 0 : 2] == NULL) {
stream->rid[rids_hml ? 0 : 2] = g_strdup(rid);
} else {
JANUS_LOG(LOG_WARN, "[%"SCNu64"] Too many RTP Stream IDs, ignoring '%s'...\n", handle->handle_id, rid);
}
}
} else if(a->name && !strcasecmp(a->name, "simulcast") && a->value) {
/* Firefox and Chrome signal simulcast support differently */
stream->legacy_rid = strstr(a->value, "rid=") ? TRUE : FALSE;
}
tempA = tempA->next;
}
/* If rid is involved, check how many of them we have (it may be less than 3) */
if(stream->rid[0] == NULL && stream->rid[2] != NULL) {
stream->rid[0] = stream->rid[1];
stream->rid[1] = stream->rid[2];
stream->rid[2] = NULL;
}
if(stream->rid[0] == NULL && stream->rid[1] != NULL) {
stream->rid[0] = stream->rid[1];
stream->rid[1] = NULL;
}
/* Let's start figuring out the SSRCs, and any grouping that may be there */
stream->audio_ssrc_peer_new = 0;
stream->video_ssrc_peer_new[0] = 0;
stream->video_ssrc_peer_new[1] = 0;
stream->video_ssrc_peer_new[2] = 0;
stream->video_ssrc_peer_rtx_new[0] = 0;
stream->video_ssrc_peer_rtx_new[1] = 0;
stream->video_ssrc_peer_rtx_new[2] = 0;
/* Any SSRC SIM group? */
tempA = m->attributes;
while(tempA) {
janus_sdp_attribute *a = (janus_sdp_attribute *)tempA->data;
if(a->name && a->value) {
if(!strcasecmp(a->name, "ssrc-group") && strstr(a->value, "SIM")) {
int res = janus_sdp_parse_ssrc_group(stream, (const char *)a->value, m->type == JANUS_SDP_VIDEO);
if(res != 0) {
JANUS_LOG(LOG_ERR, "[%"SCNu64"] Failed to parse SSRC SIM group attribute... (%d)\n", handle->handle_id, res);
}
}
}
tempA = tempA->next;
}
/* Any SSRC FID group? */
tempA = m->attributes;
while(tempA) {
janus_sdp_attribute *a = (janus_sdp_attribute *)tempA->data;
if(a->name && a->value) {
if(!strcasecmp(a->name, "ssrc-group") && strstr(a->value, "FID")) {
int res = janus_sdp_parse_ssrc_group(stream, (const char *)a->value, m->type == JANUS_SDP_VIDEO);
if(res != 0) {
JANUS_LOG(LOG_ERR, "[%"SCNu64"] Failed to parse SSRC FID group attribute... (%d)\n", handle->handle_id, res);
}
}
}
tempA = tempA->next;
}
/* Any SSRC in general? */
tempA = m->attributes;
while(tempA) {
janus_sdp_attribute *a = (janus_sdp_attribute *)tempA->data;
if(a->name && a->value) {
if(!strcasecmp(a->name, "ssrc")) {
int res = janus_sdp_parse_ssrc(stream, (const char *)a->value, m->type == JANUS_SDP_VIDEO);
if(res != 0) {
JANUS_LOG(LOG_ERR, "[%"SCNu64"] Failed to parse SSRC attribute... (%d)\n", handle->handle_id, res);
}
}
}
tempA = tempA->next;
}
/* Now look for candidates and other info */
tempA = m->attributes;
while(tempA) {
janus_sdp_attribute *a = (janus_sdp_attribute *)tempA->data;
if(a->name) {
if(!strcasecmp(a->name, "candidate")) {
if(m->type == JANUS_SDP_AUDIO && mlines > 1) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] This is an audio candidate but we're bundling on another stream, ignoring...\n", handle->handle_id);
} else if(m->type == JANUS_SDP_VIDEO && mlines > 1) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] This is a video candidate but we're bundling on another stream, ignoring...\n", handle->handle_id);
#ifdef HAVE_SCTP
} else if(m->type == JANUS_SDP_APPLICATION && mlines > 1) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] This is a SCTP candidate but we're bundling on another stream, ignoring...\n", handle->handle_id);
#endif
} else {
int res = janus_sdp_parse_candidate(stream, (const char *)a->value, 0);
if(res != 0) {
JANUS_LOG(LOG_ERR, "[%"SCNu64"] Failed to parse candidate... (%d)\n", handle->handle_id, res);
}
}
} else if(!strcasecmp(a->name, "rtcp-fb")) {
if(a->value && strstr(a->value, "nack") && stream->component) {
if(m->type == JANUS_SDP_AUDIO) {
/* Enable NACKs for audio */
stream->component->do_audio_nacks = TRUE;
} else if(m->type == JANUS_SDP_VIDEO) {
/* Enable NACKs for video */
stream->component->do_video_nacks = TRUE;
}
}
} else if(!strcasecmp(a->name, "fmtp")) {
if(a->value && strstr(a->value, "apt=")) {
/* RFC4588 rtx payload type mapping */
int ptype = -1, rtx_ptype = -1;
if(sscanf(a->value, "%d apt=%d", &rtx_ptype, &ptype) != 2) {
JANUS_LOG(LOG_ERR, "[%"SCNu64"] Failed to parse fmtp/apt attribute...\n", handle->handle_id);
} else {
rtx = TRUE;
janus_flags_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_RFC4588_RTX);
if(stream->rtx_payload_types == NULL)
stream->rtx_payload_types = g_hash_table_new(NULL, NULL);
g_hash_table_insert(stream->rtx_payload_types, GINT_TO_POINTER(ptype), GINT_TO_POINTER(rtx_ptype));
}
}
} else if(!strcasecmp(a->name, "rtpmap")) {
if(a->value) {
int ptype = atoi(a->value);
if(ptype > -1) {
char *cr = strchr(a->value, '/');
if(cr != NULL) {
cr++;
uint32_t clock_rate = 0;
if(janus_string_to_uint32(cr, &clock_rate) == 0) {
if(stream->clock_rates == NULL)
stream->clock_rates = g_hash_table_new(NULL, NULL);
g_hash_table_insert(stream->clock_rates, GINT_TO_POINTER(ptype), GUINT_TO_POINTER(clock_rate));
}
}
}
}
}
#ifdef HAVE_SCTP
else if(!strcasecmp(a->name, "sctpmap")) {
/* We don't really care */
JANUS_LOG(LOG_VERB, "Got a sctpmap attribute: %s\n", a->value);
}
#endif
}
tempA = tempA->next;
}
/* Any change in SSRCs we should be aware of? */
if(m->type == JANUS_SDP_AUDIO) {
if(stream->audio_ssrc_peer_new > 0) {
if(stream->audio_ssrc_peer > 0 && stream->audio_ssrc_peer != stream->audio_ssrc_peer_new) {
JANUS_LOG(LOG_INFO, "[%"SCNu64"] Audio SSRC changed: %"SCNu32" --> %"SCNu32"\n",
handle->handle_id, stream->audio_ssrc_peer, stream->audio_ssrc_peer_new);
/* FIXME Reset the RTCP context */
janus_ice_component *component = stream->component;
janus_mutex_lock(&component->mutex);
if(stream->audio_rtcp_ctx) {
memset(stream->audio_rtcp_ctx, 0, sizeof(*stream->audio_rtcp_ctx));
stream->audio_rtcp_ctx->tb = 48000; /* May change later */
}
if(component->last_seqs_audio)
janus_seq_list_free(&component->last_seqs_audio);
janus_mutex_unlock(&component->mutex);
}
stream->audio_ssrc_peer = stream->audio_ssrc_peer_new;
stream->audio_ssrc_peer_new = 0;
}
} else if(m->type == JANUS_SDP_VIDEO) {
int vindex = 0;
for(vindex=0; vindex<3; vindex++) {
if(stream->video_ssrc_peer_new[vindex] > 0) {
if(stream->video_ssrc_peer[vindex] > 0 && stream->video_ssrc_peer[vindex] != stream->video_ssrc_peer_new[vindex]) {
JANUS_LOG(LOG_INFO, "[%"SCNu64"] Video SSRC (#%d) changed: %"SCNu32" --> %"SCNu32"\n",
handle->handle_id, vindex, stream->video_ssrc_peer[vindex], stream->video_ssrc_peer_new[vindex]);
/* FIXME Reset the RTCP context */
janus_ice_component *component = stream->component;
if(component != NULL) {
janus_mutex_lock(&component->mutex);
if(stream->video_rtcp_ctx[vindex]) {
memset(stream->video_rtcp_ctx[vindex], 0, sizeof(*stream->video_rtcp_ctx[vindex]));
stream->video_rtcp_ctx[vindex]->tb = 90000;
}
if(component->last_seqs_video[vindex])
janus_seq_list_free(&component->last_seqs_video[vindex]);
janus_mutex_unlock(&component->mutex);
}
}
stream->video_ssrc_peer[vindex] = stream->video_ssrc_peer_new[vindex];
stream->video_ssrc_peer_new[vindex] = 0;
}
/* Do the same with the related rtx SSRC, if any */
if(stream->video_ssrc_peer_rtx_new[vindex] > 0) {
if(stream->video_ssrc_peer_rtx[vindex] > 0 && stream->video_ssrc_peer_rtx[vindex] != stream->video_ssrc_peer_rtx_new[vindex]) {
JANUS_LOG(LOG_INFO, "[%"SCNu64"] Video SSRC (#%d rtx) changed: %"SCNu32" --> %"SCNu32"\n",
handle->handle_id, vindex, stream->video_ssrc_peer_rtx[vindex], stream->video_ssrc_peer_rtx_new[vindex]);
}
stream->video_ssrc_peer_rtx[vindex] = stream->video_ssrc_peer_rtx_new[vindex];
stream->video_ssrc_peer_rtx_new[vindex] = 0;
if(stream->video_ssrc_rtx == 0)
stream->video_ssrc_rtx = janus_random_uint32(); /* FIXME Should we look for conflicts? */
}
}
if(stream->video_ssrc_peer[1] && stream->video_rtcp_ctx[1] == NULL) {
stream->video_rtcp_ctx[1] = g_malloc0(sizeof(rtcp_context));
stream->video_rtcp_ctx[1]->tb = 90000;
}
if(stream->video_ssrc_peer[2] && stream->video_rtcp_ctx[2] == NULL) {
stream->video_rtcp_ctx[2] = g_malloc0(sizeof(rtcp_context));
stream->video_rtcp_ctx[2]->tb = 90000;
}
}
temp = temp->next;
}
/* Disable RFC4588 if the peer didn't negotiate it */
if(!rtx) {
janus_flags_clear(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_RFC4588_RTX);
stream->video_ssrc_rtx = 0;
}
/* Cleanup */
g_free(ruser);
g_free(rpass);
g_free(rhashing);
g_free(rfingerprint);
return 0; /* FIXME Handle errors better */
}
typedef struct janus_sdp_mdns_candidate {
janus_ice_handle *handle;
char *candidate, *local;
GCancellable *cancellable;
} janus_sdp_mdns_candidate;
static void janus_sdp_mdns_resolved(GObject *source_object, GAsyncResult *res, gpointer user_data) {
/* This callback is invoked when the address is resolved */
janus_sdp_mdns_candidate *mc = (janus_sdp_mdns_candidate *)user_data;
GResolver *resolver = g_resolver_get_default();
GError *error = NULL;
GList *list = g_resolver_lookup_by_name_finish(resolver, res, &error);
if(mc == NULL) {
g_resolver_free_addresses(list);
g_object_unref(resolver);
return;
}
char *resolved = NULL;
if(error != NULL || list == NULL || list->data == NULL) {
JANUS_LOG(LOG_WARN, "[%"SCNu64"] Error resolving mDNS address (%s): %s\n",
mc->handle->handle_id, mc->local, error ? error->message : "no results");
} else {
resolved = g_inet_address_to_string((GInetAddress *)list->data);
JANUS_LOG(LOG_VERB, "[%"SCNu64"] mDNS address (%s) resolved: %s\n",
mc->handle->handle_id, mc->local, resolved);
}
g_resolver_free_addresses(list);
g_object_unref(resolver);
if(resolved != NULL && mc->handle->stream && mc->handle->app_handle &&
!g_atomic_int_get(&mc->handle->app_handle->stopped) &&
!g_atomic_int_get(&mc->handle->destroyed)) {
/* Replace the .local address with the resolved one in the candidate string */
mc->candidate = janus_string_replace(mc->candidate, mc->local, resolved);
/* Parse the candidate again */
janus_mutex_lock(&mc->handle->mutex);
(void)janus_sdp_parse_candidate(mc->handle->stream, mc->candidate, 1);
janus_mutex_unlock(&mc->handle->mutex);
}
g_free(resolved);
/* Get rid of the helper struct */
janus_refcount_decrease(&mc->handle->ref);
g_free(mc->candidate);
g_free(mc->local);
g_free(mc);
}
int janus_sdp_parse_candidate(void *ice_stream, const char *candidate, int trickle) {
if(ice_stream == NULL || candidate == NULL)
return -1;
janus_ice_stream *stream = (janus_ice_stream *)ice_stream;
janus_ice_handle *handle = stream->handle;
if(handle == NULL)
return -2;
janus_ice_component *component = NULL;
if(strlen(candidate) == 0 || strstr(candidate, "end-of-candidates")) {
/* FIXME Should we do something with this? */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] end-of-candidates received\n", handle->handle_id);
return 0;
}
if(strstr(candidate, "candidate:") == candidate) {
/* Skipping the 'candidate:' prefix Firefox puts in trickle candidates */
candidate += strlen("candidate:");
}
char rfoundation[33], rtransport[4], rip[50], rtype[6], rrelip[40];
guint32 rcomponent, rpriority, rport, rrelport;
int res = sscanf(candidate, "%32s %30u %3s %30u %49s %30u typ %5s %*s %39s %*s %30u",
rfoundation, &rcomponent, rtransport, &rpriority,
rip, &rport, rtype, rrelip, &rrelport);
if(res < 7) {
/* Failed to parse this address, can it be IPv6? */
if(!janus_ice_is_ipv6_enabled()) {
JANUS_LOG(LOG_WARN, "[%"SCNu64"] Received IPv6 candidate, but IPv6 support is disabled...\n", handle->handle_id);
return res;
}
}
if(res >= 7) {
if(strstr(rip, ".local")) {
/* The IP is actually an mDNS address, try to resolve it
* https://tools.ietf.org/html/draft-ietf-rtcweb-mdns-ice-candidates-04 */
if(!janus_ice_is_mdns_enabled()) {
/* ...unless mDNS resolution is disabled, in which case ignore this candidate */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] mDNS candidate ignored\n", handle->handle_id);
return 0;
}
/* We'll resolve this address asynchronously, in order not to keep this thread busy */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Resolving mDNS address (%s) asynchronously\n",
handle->handle_id, rip);
janus_sdp_mdns_candidate *mc = g_malloc(sizeof(janus_sdp_mdns_candidate));
janus_refcount_increase(&handle->ref);
mc->handle = handle;
mc->candidate = g_strdup(candidate);
mc->local = g_strdup(rip);
mc->cancellable = NULL;
GResolver *resolver = g_resolver_get_default();
g_resolver_lookup_by_name_async(resolver, rip, NULL,
(GAsyncReadyCallback)janus_sdp_mdns_resolved, mc);
g_object_unref(resolver);
return 0;
}
/* Add remote candidate */
component = stream->component;
if(component == NULL || rcomponent > 1) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] -- Skipping component %d in stream %d (rtcp-muxing)\n", handle->handle_id, rcomponent, stream->stream_id);
} else {
//~ if(trickle) {
//~ if(component->dtls != NULL) {
//~ /* This component is already ready, ignore this further candidate */
//~ JANUS_LOG(LOG_VERB, "[%"SCNu64"] -- Ignoring this candidate, the component is already ready\n", handle->handle_id);
//~ return 0;
//~ }
//~ }
component->component_id = rcomponent;
component->stream_id = stream->stream_id;
NiceCandidate *c = NULL;
if(!strcasecmp(rtype, "host")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Adding remote candidate component:%d stream:%d type:host %s:%d\n",
handle->handle_id, rcomponent, stream->stream_id, rip, rport);
/* Unless this is libnice >= 0.1.8, we only support UDP... */
if(!strcasecmp(rtransport, "udp")) {
c = nice_candidate_new(NICE_CANDIDATE_TYPE_HOST);
#ifdef HAVE_LIBNICE_TCP
} else if(!strcasecmp(rtransport, "tcp") && janus_ice_is_ice_tcp_enabled()) {
c = nice_candidate_new(NICE_CANDIDATE_TYPE_HOST);
#endif
} else {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Skipping unsupported transport '%s' for media\n", handle->handle_id, rtransport);
}
} else if(!strcasecmp(rtype, "srflx")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Adding remote candidate component:%d stream:%d type:srflx %s:%d --> %s:%d \n",
handle->handle_id, rcomponent, stream->stream_id, rrelip, rrelport, rip, rport);
/* Unless this is libnice >= 0.1.8, we only support UDP... */
if(!strcasecmp(rtransport, "udp")) {
c = nice_candidate_new(NICE_CANDIDATE_TYPE_SERVER_REFLEXIVE);
#ifdef HAVE_LIBNICE_TCP
} else if(!strcasecmp(rtransport, "tcp") && janus_ice_is_ice_tcp_enabled()) {
c = nice_candidate_new(NICE_CANDIDATE_TYPE_SERVER_REFLEXIVE);
#endif
} else {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Skipping unsupported transport '%s' for media\n", handle->handle_id, rtransport);
}
} else if(!strcasecmp(rtype, "prflx")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Adding remote candidate component:%d stream:%d type:prflx %s:%d --> %s:%d\n",
handle->handle_id, rcomponent, stream->stream_id, rrelip, rrelport, rip, rport);
/* Unless this is libnice >= 0.1.8, we only support UDP... */
if(!strcasecmp(rtransport, "udp")) {
c = nice_candidate_new(NICE_CANDIDATE_TYPE_PEER_REFLEXIVE);
#ifdef HAVE_LIBNICE_TCP
} else if(!strcasecmp(rtransport, "tcp") && janus_ice_is_ice_tcp_enabled()) {
c = nice_candidate_new(NICE_CANDIDATE_TYPE_PEER_REFLEXIVE);
#endif
} else {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Skipping unsupported transport '%s' for media\n", handle->handle_id, rtransport);
}
} else if(!strcasecmp(rtype, "relay")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Adding remote candidate component:%d stream:%d type:relay %s:%d --> %s:%d\n",
handle->handle_id, rcomponent, stream->stream_id, rrelip, rrelport, rip, rport);
/* We only support UDP/TCP/TLS... */
if(strcasecmp(rtransport, "udp") && strcasecmp(rtransport, "tcp") && strcasecmp(rtransport, "tls")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Skipping unsupported transport '%s' for media\n", handle->handle_id, rtransport);
} else {
c = nice_candidate_new(NICE_CANDIDATE_TYPE_RELAYED);
}
} else {
/* FIXME What now? */
JANUS_LOG(LOG_ERR, "[%"SCNu64"] Unknown remote candidate type:%s for component:%d stream:%d!\n",
handle->handle_id, rtype, rcomponent, stream->stream_id);
}
if(c != NULL) {
c->component_id = rcomponent;
c->stream_id = stream->stream_id;
#ifndef HAVE_LIBNICE_TCP
c->transport = NICE_CANDIDATE_TRANSPORT_UDP;
#else
if(!strcasecmp(rtransport, "udp")) {
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Transport: UDP\n", handle->handle_id);
c->transport = NICE_CANDIDATE_TRANSPORT_UDP;
} else {
/* Check the type (https://tools.ietf.org/html/rfc6544#section-4.5) */
const char *type = NULL;
int ctype = 0;
if(strstr(candidate, "tcptype active")) {
type = "active";
ctype = NICE_CANDIDATE_TRANSPORT_TCP_ACTIVE;
} else if(strstr(candidate, "tcptype passive")) {
type = "passive";
ctype = NICE_CANDIDATE_TRANSPORT_TCP_PASSIVE;
} else if(strstr(candidate, "tcptype so")) {
type = "so";
ctype = NICE_CANDIDATE_TRANSPORT_TCP_SO;
} else {
/* TODO: We should actually stop here... */
JANUS_LOG(LOG_ERR, "[%"SCNu64"] Missing tcptype info for the TCP candidate!\n", handle->handle_id);
}
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Transport: TCP (%s)\n", handle->handle_id, type);
c->transport = ctype;
}
#endif
g_strlcpy(c->foundation, rfoundation, NICE_CANDIDATE_MAX_FOUNDATION);
c->priority = rpriority;
gboolean added = nice_address_set_from_string(&c->addr, rip);
if(!added) {
JANUS_LOG(LOG_WARN, "[%"SCNu64"] Invalid address '%s', skipping %s candidate (%s)\n",
handle->handle_id, rip, rtype, candidate);
nice_candidate_free(c);
return 0;
}
nice_address_set_port(&c->addr, rport);
if(c->type == NICE_CANDIDATE_TYPE_SERVER_REFLEXIVE || c->type == NICE_CANDIDATE_TYPE_PEER_REFLEXIVE) {
added = nice_address_set_from_string(&c->base_addr, rrelip);
if(added)
nice_address_set_port(&c->base_addr, rrelport);
} else if(c->type == NICE_CANDIDATE_TYPE_RELAYED) {
/* FIXME Do we really need the base address for TURN? */
added = nice_address_set_from_string(&c->base_addr, rrelip);
if(added)
nice_address_set_port(&c->base_addr, rrelport);
}
if(!added) {
JANUS_LOG(LOG_WARN, "[%"SCNu64"] Invalid base address '%s', skipping %s candidate (%s)\n",
handle->handle_id, rrelip, rtype, candidate);
nice_candidate_free(c);
return 0;
}
component->candidates = g_slist_append(component->candidates, c);
JANUS_LOG(LOG_HUGE, "[%"SCNu64"] Candidate added to the list! (%u elements for %d/%d)\n", handle->handle_id,
g_slist_length(component->candidates), stream->stream_id, component->component_id);
/* Save for the summary, in case we need it */
component->remote_candidates = g_slist_append(component->remote_candidates, g_strdup(candidate));
/* Notify event handlers */
if(janus_events_is_enabled()) {
janus_session *session = (janus_session *)handle->session;
json_t *info = json_object();
json_object_set_new(info, "remote-candidate", json_string(candidate));
json_object_set_new(info, "stream_id", json_integer(stream->stream_id));
json_object_set_new(info, "component_id", json_integer(component->component_id));
janus_events_notify_handlers(JANUS_EVENT_TYPE_WEBRTC, JANUS_EVENT_SUBTYPE_WEBRTC_RCAND,
session->session_id, handle->handle_id, handle->opaque_id, info);
}
/* See if we need to process this */
if(trickle) {
if(janus_flags_is_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_START)) {
/* This is a trickle candidate and ICE has started, we should process it right away */
if(!component->process_started) {
/* Actually, ICE has JUST started for this component, take care of the candidates we've added so far */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] ICE already started for this component, setting candidates we have up to now\n", handle->handle_id);
janus_ice_setup_remote_candidates(handle, component->stream_id, component->component_id);
} else {
/* Queue the candidate, we'll process it in the loop */
janus_ice_add_remote_candidate(handle, c);
}
} else {
/* ICE hasn't started yet: to make sure we're not stuck, also check if we stopped processing the SDP */
if(!janus_flags_is_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_PROCESSING_OFFER)) {
janus_flags_set(&handle->webrtc_flags, JANUS_ICE_HANDLE_WEBRTC_START);
/* This is a trickle candidate and ICE has started, we should process it right away */
if(!component->process_started) {
/* Actually, ICE has JUST started for this component, take care of the candidates we've added so far */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] SDP processed but ICE not started yet for this component, setting candidates we have up to now\n", handle->handle_id);
janus_ice_setup_remote_candidates(handle, component->stream_id, component->component_id);
} else {
/* Queue the candidate, we'll process it in the loop */
janus_ice_add_remote_candidate(handle, c);
}
} else {
/* Still processing the offer/answer: queue the trickle candidate for now, we'll process it later */
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Queueing trickle candidate, status is not START yet\n", handle->handle_id);
}
}
}
}
}
} else {
JANUS_LOG(LOG_ERR, "[%"SCNu64"] Failed to parse candidate (res=%d)...\n", handle->handle_id, res);
return res;
}
return 0;
}
int janus_sdp_parse_ssrc_group(void *ice_stream, const char *group_attr, int video) {
if(ice_stream == NULL || group_attr == NULL)
return -1;
janus_ice_stream *stream = (janus_ice_stream *)ice_stream;
janus_ice_handle *handle = stream->handle;
if(handle == NULL)
return -2;
if(!video) /* We only do rtx for video, return */
return 0;
if(stream->rid[0] != NULL) {
/* Simulcasting is rid-based, don't parse SSRCs for now */
return 0;
}
gboolean fid = strstr(group_attr, "FID") != NULL;
gboolean sim = strstr(group_attr, "SIM") != NULL;
guint64 ssrc = 0;
guint32 first_ssrc = 0;
gchar **list = g_strsplit(group_attr, " ", -1);
gchar *index = list[0];
if(index != NULL) {
int i=0;
while(index != NULL) {
if(i > 0 && strlen(index) > 0) {
ssrc = g_ascii_strtoull(index, NULL, 0);
switch(i) {
case 1:
first_ssrc = ssrc;
if(stream->video_ssrc_peer_new[0] == ssrc || stream->video_ssrc_peer_new[1] == ssrc
|| stream->video_ssrc_peer_new[2] == ssrc) {
JANUS_LOG(LOG_HUGE, "[%"SCNu64"] Already parsed this SSRC: %"SCNu64" (%s group)\n",
handle->handle_id, ssrc, (fid ? "FID" : (sim ? "SIM" : "??")));
} else {
if(stream->video_ssrc_peer_new[0] == 0) {
stream->video_ssrc_peer_new[0] = ssrc;
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Peer video SSRC: %"SCNu32"\n", handle->handle_id, stream->video_ssrc_peer_new[0]);
} else {
/* We already have a video SSRC: check if rid is involved, and we'll keep track of this for simulcasting */
if(stream->rid[0]) {
if(stream->video_ssrc_peer_new[1] == 0) {
stream->video_ssrc_peer_new[1] = ssrc;
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Peer video SSRC (sim-1): %"SCNu32"\n", handle->handle_id, stream->video_ssrc_peer_new[1]);
} else if(stream->video_ssrc_peer_new[2] == 0) {
stream->video_ssrc_peer_new[2] = ssrc;
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Peer video SSRC (sim-2): %"SCNu32"\n", handle->handle_id, stream->video_ssrc_peer_new[2]);
} else {
JANUS_LOG(LOG_WARN, "[%"SCNu64"] Don't know what to do with video SSRC: %"SCNu64"\n", handle->handle_id, ssrc);
}
}
}
}
break;
case 2:
if(fid) {
if(stream->video_ssrc_peer_new[0] == first_ssrc && stream->video_ssrc_peer_rtx_new[0] == 0) {
stream->video_ssrc_peer_rtx_new[0] = ssrc;
JANUS_LOG(LOG_VERB, "[%"SCNu64"] Peer video SSRC (rtx): %"SCNu32"\n", handle->handle_id, stream->video_ssrc_peer_rtx_new[0]);