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linphone-iphone/coreapi/bellesip_sal/sal_sdp.c
Ghislain MARY 7ceddff0b9 Do not rename files to compile them as C++.
2017-07-24 11:56:50 +02:00

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/*
linphone
Copyright (C) 2012 Belledonne Communications, Grenoble, France
This program 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 2
of the License, or (at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "sal_impl.h"
#define keywordcmp(key,b) strncmp(key,b,sizeof(key))
inline OrtpRtcpXrStatSummaryFlag operator|=(OrtpRtcpXrStatSummaryFlag a, OrtpRtcpXrStatSummaryFlag b) {
int ia = static_cast<int>(a);
int ib = static_cast<int>(b);
return static_cast<OrtpRtcpXrStatSummaryFlag>(ia |= ib);
}
static void add_ice_candidates(belle_sdp_media_description_t *md, const SalStreamDescription *desc){
char buffer[1024];
const SalIceCandidate *candidate;
int nb;
int i;
for (i = 0; i < SAL_MEDIA_DESCRIPTION_MAX_ICE_CANDIDATES; i++) {
candidate = &desc->ice_candidates[i];
if ((candidate->addr[0] == '\0') || (candidate->port == 0)) break;
nb = snprintf(buffer, sizeof(buffer), "%s %u UDP %u %s %d typ %s",
candidate->foundation, candidate->componentID, candidate->priority, candidate->addr, candidate->port, candidate->type);
if (nb < 0) {
ms_error("Cannot add ICE candidate attribute!");
return;
}
if (candidate->raddr[0] != '\0') {
nb = snprintf(buffer + nb, sizeof(buffer) - nb, " raddr %s rport %d", candidate->raddr, candidate->rport);
if (nb < 0) {
ms_error("Cannot add ICE candidate attribute!");
return;
}
}
belle_sdp_media_description_add_attribute(md,belle_sdp_attribute_create("candidate",buffer));
}
}
static void add_ice_remote_candidates(belle_sdp_media_description_t *md, const SalStreamDescription *desc){
char buffer[1024];
char *ptr = buffer;
const SalIceRemoteCandidate *candidate;
int offset = 0;
int i;
buffer[0] = '\0';
for (i = 0; i < SAL_MEDIA_DESCRIPTION_MAX_ICE_REMOTE_CANDIDATES; i++) {
candidate = &desc->ice_remote_candidates[i];
if ((candidate->addr[0] != '\0') && (candidate->port != 0)) {
offset = snprintf(ptr, buffer + sizeof(buffer) - ptr, "%s%d %s %d", (i > 0) ? " " : "", i + 1, candidate->addr, candidate->port);
if (offset < 0) {
ms_error("Cannot add ICE remote-candidates attribute!");
return;
}
ptr += offset;
}
}
if (buffer[0] != '\0') belle_sdp_media_description_add_attribute(md,belle_sdp_attribute_create("remote-candidates",buffer));
}
static bool_t is_rtcp_fb_trr_int_the_same_for_all_payloads(const SalStreamDescription *stream, uint16_t *trr_int) {
bctbx_list_t *pt_it;
bool_t first = TRUE;
for (pt_it = stream->payloads; pt_it != NULL; pt_it = pt_it->next) {
PayloadType *pt = (PayloadType *)pt_it->data;
if (payload_type_get_flags(pt) & PAYLOAD_TYPE_RTCP_FEEDBACK_ENABLED) {
if (first == TRUE) {
*trr_int = payload_type_get_avpf_params(pt).trr_interval;
first = FALSE;
} else if (payload_type_get_avpf_params(pt).trr_interval != *trr_int) {
return FALSE;
}
}
}
return TRUE;
}
static void add_rtcp_fb_trr_int_attribute(belle_sdp_media_description_t *media_desc, int8_t id, uint16_t trr_int) {
belle_sdp_rtcp_fb_attribute_t *attribute = belle_sdp_rtcp_fb_attribute_new();
belle_sdp_rtcp_fb_attribute_set_id(attribute, id);
belle_sdp_rtcp_fb_attribute_set_type(attribute, BELLE_SDP_RTCP_FB_TRR_INT);
belle_sdp_rtcp_fb_attribute_set_trr_int(attribute, trr_int);
belle_sdp_media_description_add_attribute(media_desc, BELLE_SDP_ATTRIBUTE(attribute));
}
static void add_rtcp_fb_ack_attribute(belle_sdp_media_description_t *media_desc, int8_t id, belle_sdp_rtcp_fb_val_param_t param) {
belle_sdp_rtcp_fb_attribute_t *attribute = belle_sdp_rtcp_fb_attribute_new();
belle_sdp_rtcp_fb_attribute_set_id(attribute, id);
belle_sdp_rtcp_fb_attribute_set_type(attribute, BELLE_SDP_RTCP_FB_ACK);
belle_sdp_rtcp_fb_attribute_set_param(attribute, param);
belle_sdp_media_description_add_attribute(media_desc, BELLE_SDP_ATTRIBUTE(attribute));
}
static void add_rtcp_fb_nack_attribute(belle_sdp_media_description_t *media_desc, int8_t id, belle_sdp_rtcp_fb_val_param_t param) {
belle_sdp_rtcp_fb_attribute_t *attribute = belle_sdp_rtcp_fb_attribute_new();
belle_sdp_rtcp_fb_attribute_set_id(attribute, id);
belle_sdp_rtcp_fb_attribute_set_type(attribute, BELLE_SDP_RTCP_FB_NACK);
belle_sdp_rtcp_fb_attribute_set_param(attribute, param);
belle_sdp_media_description_add_attribute(media_desc, BELLE_SDP_ATTRIBUTE(attribute));
}
static void add_rtcp_fb_ccm_attribute(belle_sdp_media_description_t *media_desc, int8_t id, belle_sdp_rtcp_fb_val_param_t param) {
belle_sdp_rtcp_fb_attribute_t *attribute = belle_sdp_rtcp_fb_attribute_new();
belle_sdp_rtcp_fb_attribute_set_id(attribute, id);
belle_sdp_rtcp_fb_attribute_set_type(attribute, BELLE_SDP_RTCP_FB_CCM);
belle_sdp_rtcp_fb_attribute_set_param(attribute, param);
belle_sdp_media_description_add_attribute(media_desc, BELLE_SDP_ATTRIBUTE(attribute));
}
static void add_rtcp_fb_attributes(belle_sdp_media_description_t *media_desc, const SalMediaDescription *md, const SalStreamDescription *stream) {
bctbx_list_t *pt_it;
PayloadType *pt;
PayloadTypeAvpfParams avpf_params;
bool_t general_trr_int;
uint16_t trr_int = 0;
general_trr_int = is_rtcp_fb_trr_int_the_same_for_all_payloads(stream, &trr_int);
if (general_trr_int == TRUE && trr_int != 0) {
add_rtcp_fb_trr_int_attribute(media_desc, -1, trr_int);
}
if (stream->rtcp_fb.generic_nack_enabled == TRUE) {
add_rtcp_fb_nack_attribute(media_desc, -1, BELLE_SDP_RTCP_FB_NONE);
}
if (stream->rtcp_fb.tmmbr_enabled == TRUE) {
add_rtcp_fb_ccm_attribute(media_desc, -1, BELLE_SDP_RTCP_FB_TMMBR);
}
for (pt_it = stream->payloads; pt_it != NULL; pt_it = pt_it->next) {
pt = (PayloadType *)pt_it->data;
/* AVPF/SAVPF profile is used so enable AVPF for all payload types. */
payload_type_set_flag(pt, PAYLOAD_TYPE_RTCP_FEEDBACK_ENABLED);
avpf_params = payload_type_get_avpf_params(pt);
/* Add trr-int if not set generally. */
if (general_trr_int != TRUE && trr_int != 0) {
add_rtcp_fb_trr_int_attribute(media_desc, payload_type_get_number(pt), avpf_params.trr_interval);
}
/* Add rtcp-fb attributes according to the AVPF features of the payload types. */
if (avpf_params.features & PAYLOAD_TYPE_AVPF_PLI) {
add_rtcp_fb_nack_attribute(media_desc, payload_type_get_number(pt), BELLE_SDP_RTCP_FB_PLI);
}
if (avpf_params.features & PAYLOAD_TYPE_AVPF_SLI) {
add_rtcp_fb_nack_attribute(media_desc, payload_type_get_number(pt), BELLE_SDP_RTCP_FB_SLI);
}
if (avpf_params.features & PAYLOAD_TYPE_AVPF_RPSI) {
if (avpf_params.rpsi_compatibility == TRUE) {
add_rtcp_fb_nack_attribute(media_desc, payload_type_get_number(pt), BELLE_SDP_RTCP_FB_RPSI);
} else {
add_rtcp_fb_ack_attribute(media_desc, payload_type_get_number(pt), BELLE_SDP_RTCP_FB_RPSI);
}
}
if (avpf_params.features & PAYLOAD_TYPE_AVPF_FIR) {
add_rtcp_fb_ccm_attribute(media_desc, payload_type_get_number(pt), BELLE_SDP_RTCP_FB_FIR);
}
}
}
static belle_sdp_attribute_t * create_rtcp_xr_attribute(const OrtpRtcpXrConfiguration *config) {
belle_sdp_rtcp_xr_attribute_t *attribute = belle_sdp_rtcp_xr_attribute_new();
if (config->rcvr_rtt_mode != OrtpRtcpXrRcvrRttNone) {
if (config->rcvr_rtt_mode == OrtpRtcpXrRcvrRttAll) belle_sdp_rtcp_xr_attribute_set_rcvr_rtt_mode(attribute, "all");
else if (config->rcvr_rtt_mode == OrtpRtcpXrRcvrRttSender) belle_sdp_rtcp_xr_attribute_set_rcvr_rtt_mode(attribute, "sender");
belle_sdp_rtcp_xr_attribute_set_rcvr_rtt_max_size(attribute, config->rcvr_rtt_max_size);
}
belle_sdp_rtcp_xr_attribute_set_stat_summary(attribute, (config->stat_summary_enabled == TRUE));
if (config->stat_summary_enabled == TRUE) {
if (config->stat_summary_flags & OrtpRtcpXrStatSummaryLoss) belle_sdp_rtcp_xr_attribute_add_stat_summary_flag(attribute, "loss");
if (config->stat_summary_flags & OrtpRtcpXrStatSummaryDup) belle_sdp_rtcp_xr_attribute_add_stat_summary_flag(attribute, "dup");
if (config->stat_summary_flags & OrtpRtcpXrStatSummaryJitt) belle_sdp_rtcp_xr_attribute_add_stat_summary_flag(attribute, "jitt");
if (config->stat_summary_flags & OrtpRtcpXrStatSummaryTTL) belle_sdp_rtcp_xr_attribute_add_stat_summary_flag(attribute, "TTL");
if (config->stat_summary_flags & OrtpRtcpXrStatSummaryHL) belle_sdp_rtcp_xr_attribute_add_stat_summary_flag(attribute, "HL");
}
belle_sdp_rtcp_xr_attribute_set_voip_metrics(attribute, (config->voip_metrics_enabled == TRUE));
return BELLE_SDP_ATTRIBUTE(attribute);
}
static void stream_description_to_sdp ( belle_sdp_session_description_t *session_desc, const SalMediaDescription *md, const SalStreamDescription *stream ) {
belle_sdp_mime_parameter_t* mime_param;
belle_sdp_media_description_t* media_desc;
int j;
bctbx_list_t* pt_it;
PayloadType* pt;
char buffer[1024];
const char* dir=NULL;
const char *rtp_addr;
const char *rtcp_addr;
int rtp_port;
int rtcp_port;
bool_t different_rtp_and_rtcp_addr;
rtp_addr=stream->rtp_addr;
rtcp_addr=stream->rtcp_addr;
rtp_port=stream->rtp_port;
rtcp_port=stream->rtcp_port;
media_desc = belle_sdp_media_description_create ( sal_stream_description_get_type_as_string(stream)
,stream->rtp_port
,1
,sal_media_proto_to_string ( stream->proto )
,NULL );
if (stream->payloads) {
for ( pt_it=stream->payloads; pt_it!=NULL; pt_it=pt_it->next ) {
pt= ( PayloadType* ) pt_it->data;
mime_param= belle_sdp_mime_parameter_create ( pt->mime_type
, payload_type_get_number ( pt )
, pt->clock_rate
, pt->channels>0 ? pt->channels : -1 );
belle_sdp_mime_parameter_set_parameters ( mime_param,pt->recv_fmtp );
if ( stream->ptime>0 ) {
belle_sdp_mime_parameter_set_ptime ( mime_param,stream->ptime );
}
belle_sdp_media_description_append_values_from_mime_parameter ( media_desc,mime_param );
belle_sip_object_unref ( mime_param );
}
} else {
/* to comply with SDP we cannot have an empty payload type number list */
/* as it happens only when mline is declined with a zero port, it does not matter to put whatever codec*/
belle_sip_list_t* format = belle_sip_list_append(NULL,0);
belle_sdp_media_set_media_formats(belle_sdp_media_description_get_media(media_desc),format);
}
/*only add a c= line within the stream description if address are differents*/
if (rtp_addr[0]!='\0' && strcmp(rtp_addr,md->addr)!=0){
bool_t inet6;
belle_sdp_connection_t *connection;
if (strchr(rtp_addr,':')!=NULL){
inet6=TRUE;
}else inet6=FALSE;
connection = belle_sdp_connection_create("IN", inet6 ? "IP6" : "IP4", rtp_addr);
if (ms_is_multicast(rtp_addr)) {
/*remove session cline in case of multicast*/
belle_sdp_session_description_set_connection(session_desc,NULL);
if (inet6 == FALSE)
belle_sdp_connection_set_ttl(connection,stream->ttl);
}
belle_sdp_media_description_set_connection(media_desc,connection);
}
if ( stream->bandwidth>0 )
belle_sdp_media_description_set_bandwidth ( media_desc,"AS",stream->bandwidth );
if (sal_stream_description_has_srtp(stream)) {
/* add crypto lines */
for ( j=0; j<SAL_CRYPTO_ALGO_MAX; j++ ) {
MSCryptoSuiteNameParams desc;
if (ms_crypto_suite_to_name_params(stream->crypto[j].algo,&desc)==0){
if (desc.params)
snprintf ( buffer, sizeof ( buffer )-1, "%d %s inline:%s %s", stream->crypto[j].tag, desc.name, stream->crypto[j].master_key,desc.params);
else
snprintf ( buffer, sizeof ( buffer )-1, "%d %s inline:%s", stream->crypto[j].tag, desc.name, stream->crypto[j].master_key );
belle_sdp_media_description_add_attribute( media_desc,belle_sdp_attribute_create ("crypto", buffer));
}else break;
}
}
/* insert DTLS session attribute if needed */
if ((stream->proto == SalProtoUdpTlsRtpSavpf) || (stream->proto == SalProtoUdpTlsRtpSavp)) {
char* ssrc_attribute = ms_strdup_printf("%u cname:%s",stream->rtp_ssrc,stream->rtcp_cname);
if ((stream->dtls_role != SalDtlsRoleInvalid) && (strlen(stream->dtls_fingerprint)>0)) {
switch(stream->dtls_role) {
case SalDtlsRoleIsClient:
belle_sdp_media_description_add_attribute(media_desc, belle_sdp_attribute_create("setup","active"));
break;
case SalDtlsRoleIsServer:
belle_sdp_media_description_add_attribute(media_desc, belle_sdp_attribute_create("setup","passive"));
break;
case SalDtlsRoleUnset:
default:
belle_sdp_media_description_add_attribute(media_desc, belle_sdp_attribute_create("setup","actpass"));
break;
}
belle_sdp_media_description_add_attribute(media_desc, belle_sdp_attribute_create("fingerprint",stream->dtls_fingerprint));
}
belle_sdp_media_description_add_attribute(media_desc, belle_sdp_attribute_create("ssrc",ssrc_attribute));
ms_free(ssrc_attribute);
}
/* insert zrtp-hash attribute if needed */
if (stream->haveZrtpHash == 1) {
belle_sdp_media_description_add_attribute(media_desc, belle_sdp_attribute_create("zrtp-hash", (const char *)(stream->zrtphash)));
}
switch ( stream->dir ) {
case SalStreamSendRecv:
/*dir="sendrecv";*/
dir=NULL;
break;
case SalStreamRecvOnly:
dir="recvonly";
break;
case SalStreamSendOnly:
dir="sendonly";
break;
case SalStreamInactive:
dir="inactive";
break;
}
if ( dir ) belle_sdp_media_description_add_attribute ( media_desc,belle_sdp_attribute_create ( dir,NULL ) );
if (stream->rtcp_mux){
belle_sdp_media_description_add_attribute(media_desc, belle_sdp_attribute_create ("rtcp-mux",NULL ) );
}
if (rtp_port != 0) {
different_rtp_and_rtcp_addr = (rtcp_addr[0] != '\0') && (strcmp(rtp_addr, rtcp_addr) != 0);
if ((rtcp_port != (rtp_port + 1)) || (different_rtp_and_rtcp_addr == TRUE)) {
if (different_rtp_and_rtcp_addr == TRUE) {
snprintf(buffer, sizeof(buffer), "%u IN IP4 %s", rtcp_port, rtcp_addr);
} else {
snprintf(buffer, sizeof(buffer), "%u",rtcp_port);
}
belle_sdp_media_description_add_attribute(media_desc,belle_sdp_attribute_create ("rtcp",buffer));
}
}
if (stream->set_nortpproxy == TRUE) {
belle_sdp_media_description_add_attribute(media_desc,belle_sdp_attribute_create ("nortpproxy","yes"));
}
if (stream->ice_mismatch == TRUE) {
belle_sdp_media_description_add_attribute(media_desc,belle_sdp_attribute_create ("ice-mismatch",NULL));
} else {
if (rtp_port != 0) {
if (stream->ice_pwd[0] != '\0')
belle_sdp_media_description_add_attribute(media_desc,belle_sdp_attribute_create ("ice-pwd",stream->ice_pwd));
if (stream->ice_ufrag[0] != '\0')
belle_sdp_media_description_add_attribute(media_desc,belle_sdp_attribute_create ("ice-ufrag",stream->ice_ufrag));
add_ice_candidates(media_desc,stream);
add_ice_remote_candidates(media_desc,stream);
}
}
if ((rtp_port != 0) && (sal_stream_description_has_avpf(stream) || sal_stream_description_has_implicit_avpf(stream))) {
add_rtcp_fb_attributes(media_desc, md, stream);
}
if ((rtp_port != 0) && (stream->rtcp_xr.enabled == TRUE)) {
char sastr[1024] = {0};
char mastr[1024] = {0};
size_t saoff = 0;
size_t maoff = 0;
const belle_sdp_attribute_t *session_attribute = belle_sdp_session_description_get_attribute(session_desc, "rtcp-xr");
belle_sdp_attribute_t *media_attribute;
if (session_attribute != NULL) {
belle_sip_object_marshal((belle_sip_object_t*)session_attribute, sastr, sizeof(sastr), &saoff);
}
media_attribute = create_rtcp_xr_attribute(&stream->rtcp_xr);
if (media_attribute != NULL) {
belle_sip_object_marshal((belle_sip_object_t*)media_attribute, mastr, sizeof(mastr), &maoff);
}
if (strcmp(sastr, mastr) != 0) {
belle_sdp_media_description_add_attribute(media_desc, media_attribute);
} else {
belle_sip_object_unref((belle_sip_object_t*)media_attribute);
}
}
if (stream->custom_sdp_attributes) {
belle_sdp_session_description_t *custom_desc = (belle_sdp_session_description_t *)stream->custom_sdp_attributes;
belle_sip_list_t *l = belle_sdp_session_description_get_attributes(custom_desc);
belle_sip_list_t *elem;
for (elem = l; elem != NULL; elem = elem->next) {
belle_sdp_media_description_add_attribute(media_desc, (belle_sdp_attribute_t *)elem->data);
}
}
/*
* rfc5576
* 4.1. The "ssrc" Media Attribute
* <ssrc-id> is the synchronization source (SSRC) ID of the
* source being described, interpreted as a 32-bit unsigned integer in
* network byte order and represented in decimal.*/
belle_sdp_session_description_add_media_description(session_desc, media_desc);
}
belle_sdp_session_description_t * media_description_to_sdp ( const SalMediaDescription *desc ) {
belle_sdp_session_description_t* session_desc=belle_sdp_session_description_new();
bool_t inet6;
belle_sdp_origin_t* origin;
int i;
if ( strchr ( desc->addr,':' ) !=NULL ) {
inet6=1;
} else inet6=0;
belle_sdp_session_description_set_version ( session_desc,belle_sdp_version_create ( 0 ) );
origin = belle_sdp_origin_create ( desc->username
,desc->session_id
,desc->session_ver
,"IN"
, inet6 ? "IP6" :"IP4"
,desc->addr );
belle_sdp_session_description_set_origin ( session_desc,origin );
belle_sdp_session_description_set_session_name ( session_desc,
belle_sdp_session_name_create ( desc->name[0]!='\0' ? desc->name : "Talk" ) );
if ( !sal_media_description_has_dir ( desc,SalStreamInactive ) || desc->ice_ufrag[0] != '\0' ) {
/*in case of sendonly, setting of the IP on cnx we give a chance to receive stun packets*/
belle_sdp_session_description_set_connection ( session_desc
,belle_sdp_connection_create ( "IN",inet6 ? "IP6" :"IP4",desc->addr ) );
} else {
belle_sdp_session_description_set_connection ( session_desc
,belle_sdp_connection_create ( "IN"
,inet6 ? "IP6" :"IP4"
,inet6 ? "::0" :"0.0.0.0" ) );
}
belle_sdp_session_description_set_time_description ( session_desc,belle_sdp_time_description_create ( 0,0 ) );
if ( desc->bandwidth>0 ) {
belle_sdp_session_description_set_bandwidth ( session_desc,"AS",desc->bandwidth );
}
if (desc->set_nortpproxy == TRUE) belle_sdp_session_description_add_attribute(session_desc, belle_sdp_attribute_create("nortpproxy","yes"));
if (desc->ice_pwd[0] != '\0') belle_sdp_session_description_add_attribute(session_desc, belle_sdp_attribute_create("ice-pwd",desc->ice_pwd));
if (desc->ice_ufrag[0] != '\0') belle_sdp_session_description_add_attribute(session_desc, belle_sdp_attribute_create("ice-ufrag",desc->ice_ufrag));
if (desc->rtcp_xr.enabled == TRUE) {
belle_sdp_session_description_add_attribute(session_desc, create_rtcp_xr_attribute(&desc->rtcp_xr));
}
if (desc->custom_sdp_attributes) {
belle_sdp_session_description_t *custom_desc = (belle_sdp_session_description_t *)desc->custom_sdp_attributes;
belle_sip_list_t *l = belle_sdp_session_description_get_attributes(custom_desc);
belle_sip_list_t *elem;
for (elem = l; elem != NULL; elem = elem->next) {
belle_sdp_session_description_add_attribute(session_desc, (belle_sdp_attribute_t *)elem->data);
}
}
for ( i=0; i<desc->nb_streams; i++ ) {
stream_description_to_sdp(session_desc, desc, &desc->streams[i]);
}
return session_desc;
}
static void sdp_parse_payload_types(belle_sdp_media_description_t *media_desc, SalStreamDescription *stream) {
PayloadType *pt;
PayloadTypeAvpfParams avpf_params;
belle_sip_list_t* mime_param_it=NULL;
belle_sdp_mime_parameter_t* mime_param;
belle_sip_list_t* mime_params=belle_sdp_media_description_build_mime_parameters ( media_desc );
memset(&avpf_params, 0, sizeof(avpf_params));
for ( mime_param_it=mime_params
; mime_param_it!=NULL
; mime_param_it=mime_param_it->next ) {
mime_param=BELLE_SDP_MIME_PARAMETER ( mime_param_it->data );
pt=payload_type_new();
payload_type_set_number ( pt,belle_sdp_mime_parameter_get_media_format ( mime_param ) );
pt->clock_rate=belle_sdp_mime_parameter_get_rate ( mime_param );
pt->mime_type=ms_strdup ( belle_sdp_mime_parameter_get_type ( mime_param ) );
pt->channels=belle_sdp_mime_parameter_get_channel_count ( mime_param );
payload_type_set_send_fmtp ( pt,belle_sdp_mime_parameter_get_parameters ( mime_param ) );
payload_type_set_avpf_params(pt, avpf_params);
stream->payloads=bctbx_list_append ( stream->payloads,pt );
stream->ptime=belle_sdp_mime_parameter_get_ptime ( mime_param );
ms_message ( "Found payload %s/%i fmtp=%s",pt->mime_type,pt->clock_rate,
pt->send_fmtp ? pt->send_fmtp : "" );
}
if ( mime_params ) belle_sip_list_free_with_data ( mime_params,belle_sip_object_unref );
}
static void sdp_parse_media_crypto_parameters(belle_sdp_media_description_t *media_desc, SalStreamDescription *stream) {
belle_sip_list_t *attribute_it;
belle_sdp_attribute_t *attribute;
char tmp[256], tmp2[256], parameters[256]={0};
int valid_count = 0;
int nb;
memset ( &stream->crypto, 0, sizeof ( stream->crypto ) );
for ( attribute_it=belle_sdp_media_description_get_attributes ( media_desc )
; valid_count < SAL_CRYPTO_ALGO_MAX && attribute_it!=NULL;
attribute_it=attribute_it->next ) {
attribute=BELLE_SDP_ATTRIBUTE ( attribute_it->data );
if ( keywordcmp ( "crypto",belle_sdp_attribute_get_name ( attribute ) ) ==0 && belle_sdp_attribute_get_value ( attribute ) !=NULL ) {
nb = sscanf ( belle_sdp_attribute_get_value ( attribute ), "%d %256s inline:%256s %256s",
&stream->crypto[valid_count].tag,
tmp,
tmp2, parameters );
if ( nb >= 3 ) {
MSCryptoSuite cs;
MSCryptoSuiteNameParams np;
np.name=tmp;
np.params=parameters[0]!='\0' ? parameters : NULL;
cs=ms_crypto_suite_build_from_name_params(&np);
if (cs==MS_CRYPTO_SUITE_INVALID){
ms_warning ( "Failed to parse crypto-algo: '%s'", tmp );
stream->crypto[valid_count].algo = MS_CRYPTO_SUITE_INVALID;
}else{
char *sep;
strncpy ( stream->crypto[valid_count].master_key, tmp2, sizeof(stream->crypto[valid_count].master_key)-1 );
sep=strchr(stream->crypto[valid_count].master_key,'|');
if (sep) *sep='\0';
stream->crypto[valid_count].algo = cs;
ms_message ( "Found valid crypto line (tag:%d algo:'%s' key:'%s'",
stream->crypto[valid_count].tag,
tmp,
stream->crypto[valid_count].master_key );
valid_count++;
}
}else{
ms_warning ( "sdp has a strange a= line (%s) nb=%i",belle_sdp_attribute_get_value ( attribute ),nb );
}
}
}
ms_message("Found: %d valid crypto lines", valid_count );
}
static void sdp_parse_media_ice_parameters(belle_sdp_media_description_t *media_desc, SalStreamDescription *stream) {
belle_sip_list_t *attribute_it;
belle_sdp_attribute_t *attribute;
const char *att_name;
const char *value;
int nb_ice_candidates = 0;
for (attribute_it = belle_sdp_media_description_get_attributes(media_desc); attribute_it != NULL; attribute_it=attribute_it->next) {
attribute=BELLE_SDP_ATTRIBUTE(attribute_it->data);
att_name = belle_sdp_attribute_get_name(attribute);
value = belle_sdp_attribute_get_value(attribute);
if ((nb_ice_candidates < (int)(sizeof(stream->ice_candidates)/sizeof(SalIceCandidate)))
&& (keywordcmp("candidate", att_name) == 0)
&& (value != NULL)) {
SalIceCandidate *candidate = &stream->ice_candidates[nb_ice_candidates];
char proto[4];
int nb = sscanf(value, "%s %u %3s %u %s %d typ %s raddr %s rport %d",
candidate->foundation, &candidate->componentID, proto, &candidate->priority, candidate->addr, &candidate->port,
candidate->type, candidate->raddr, &candidate->rport);
if (strcasecmp("udp",proto)==0 && ((nb == 7) || (nb == 9))) nb_ice_candidates++;
else {
ms_error("ice: Failed parsing a=candidate SDP attribute");
memset(candidate, 0, sizeof(*candidate));
}
} else if ((keywordcmp("remote-candidates", att_name) == 0) && (value != NULL)) {
SalIceRemoteCandidate candidate;
unsigned int componentID;
int offset;
const char *ptr = value;
const char *endptr = value + strlen(ptr);
while (3 == sscanf(ptr, "%u %s %u%n", &componentID, candidate.addr, &candidate.port, &offset)) {
if ((componentID > 0) && (componentID <= SAL_MEDIA_DESCRIPTION_MAX_ICE_REMOTE_CANDIDATES)) {
SalIceRemoteCandidate *remote_candidate = &stream->ice_remote_candidates[componentID - 1];
strncpy(remote_candidate->addr, candidate.addr, sizeof(remote_candidate->addr)-1);
remote_candidate->port = candidate.port;
}
ptr += offset;
if (ptr < endptr) {
if (ptr[offset] == ' ') ptr += 1;
} else break;
}
} else if ((keywordcmp("ice-ufrag", att_name) == 0) && (value != NULL)) {
strncpy(stream->ice_ufrag, value, sizeof(stream->ice_ufrag)-1);
} else if ((keywordcmp("ice-pwd", att_name) == 0) && (value != NULL)) {
strncpy(stream->ice_pwd, value, sizeof(stream->ice_pwd) -1);
} else if (keywordcmp("ice-mismatch", att_name) == 0) {
stream->ice_mismatch = TRUE;
}
}
}
static void enable_avpf_for_stream(SalStreamDescription *stream) {
bctbx_list_t *pt_it;
for (pt_it = stream->payloads; pt_it != NULL; pt_it = pt_it->next) {
PayloadType *pt = (PayloadType *)pt_it->data;
payload_type_set_flag(pt, PAYLOAD_TYPE_RTCP_FEEDBACK_ENABLED);
}
}
static void apply_rtcp_fb_attribute_to_payload(belle_sdp_rtcp_fb_attribute_t *fb_attribute, SalStreamDescription *stream, PayloadType *pt) {
PayloadTypeAvpfParams avpf_params = payload_type_get_avpf_params(pt);
switch (belle_sdp_rtcp_fb_attribute_get_type(fb_attribute)) {
case BELLE_SDP_RTCP_FB_ACK:
if (belle_sdp_rtcp_fb_attribute_get_param(fb_attribute) == BELLE_SDP_RTCP_FB_RPSI) {
avpf_params.features |= PAYLOAD_TYPE_AVPF_RPSI;
}
break;
case BELLE_SDP_RTCP_FB_NACK:
switch (belle_sdp_rtcp_fb_attribute_get_param(fb_attribute)) {
case BELLE_SDP_RTCP_FB_PLI:
avpf_params.features |= PAYLOAD_TYPE_AVPF_PLI;
break;
case BELLE_SDP_RTCP_FB_SLI:
avpf_params.features |= PAYLOAD_TYPE_AVPF_SLI;
break;
case BELLE_SDP_RTCP_FB_RPSI:
/* Linphone uses positive feeback for RPSI. However first versions handling
* AVPF wrongly declared RPSI as negative feedback, so this is kept for compatibility
* with these versions but will probably be removed at some point in time. */
avpf_params.features |= PAYLOAD_TYPE_AVPF_RPSI;
avpf_params.rpsi_compatibility = TRUE;
break;
case BELLE_SDP_RTCP_FB_NONE:
stream->rtcp_fb.generic_nack_enabled = TRUE;
break;
default:
break;
}
break;
case BELLE_SDP_RTCP_FB_TRR_INT:
avpf_params.trr_interval = belle_sdp_rtcp_fb_attribute_get_trr_int(fb_attribute);
break;
case BELLE_SDP_RTCP_FB_CCM:
switch (belle_sdp_rtcp_fb_attribute_get_param(fb_attribute)) {
case BELLE_SDP_RTCP_FB_FIR:
avpf_params.features |= PAYLOAD_TYPE_AVPF_FIR;
break;
case BELLE_SDP_RTCP_FB_TMMBR:
stream->rtcp_fb.tmmbr_enabled = TRUE;
break;
default:
break;
}
break;
default:
break;
}
payload_type_set_avpf_params(pt, avpf_params);
}
static bool_t sdp_parse_rtcp_fb_parameters(belle_sdp_media_description_t *media_desc, SalStreamDescription *stream) {
belle_sip_list_t *it;
belle_sdp_attribute_t *attribute;
belle_sdp_rtcp_fb_attribute_t *fb_attribute;
bctbx_list_t *pt_it;
PayloadType *pt;
int8_t pt_num;
bool_t retval = FALSE;
/* Handle rtcp-fb attributes that concern all payload types. */
for (it = belle_sdp_media_description_get_attributes(media_desc); it != NULL; it = it->next) {
attribute = BELLE_SDP_ATTRIBUTE(it->data);
if (keywordcmp("rtcp-fb", belle_sdp_attribute_get_name(attribute)) == 0) {
fb_attribute = BELLE_SDP_RTCP_FB_ATTRIBUTE(attribute);
if (belle_sdp_rtcp_fb_attribute_get_id(fb_attribute) == -1) {
for (pt_it = stream->payloads; pt_it != NULL; pt_it = pt_it->next) {
pt = (PayloadType *)pt_it->data;
apply_rtcp_fb_attribute_to_payload(fb_attribute, stream, pt);
retval = TRUE;
}
}
}
}
/* Handle rtcp-fb attributes that are specefic to a payload type. */
for (it = belle_sdp_media_description_get_attributes(media_desc); it != NULL; it = it->next) {
attribute = BELLE_SDP_ATTRIBUTE(it->data);
if (keywordcmp("rtcp-fb", belle_sdp_attribute_get_name(attribute)) == 0) {
fb_attribute = BELLE_SDP_RTCP_FB_ATTRIBUTE(attribute);
pt_num = belle_sdp_rtcp_fb_attribute_get_id(fb_attribute);
for (pt_it = stream->payloads; pt_it != NULL; pt_it = pt_it->next) {
pt = (PayloadType *)pt_it->data;
retval = TRUE;
if (payload_type_get_number(pt) == (int)pt_num) {
apply_rtcp_fb_attribute_to_payload(fb_attribute, stream, pt);
}
}
}
}
return retval;
}
static void sal_init_rtcp_xr_description(OrtpRtcpXrConfiguration *config) {
config->enabled = FALSE;
config->rcvr_rtt_mode = OrtpRtcpXrRcvrRttNone;
config->rcvr_rtt_max_size = -1;
config->stat_summary_flags = OrtpRtcpXrStatSummaryNone;
config->voip_metrics_enabled = FALSE;
}
static void sdp_parse_rtcp_xr_parameters(const belle_sdp_attribute_t *attribute, OrtpRtcpXrConfiguration *config) {
if (attribute != NULL) {
const belle_sdp_rtcp_xr_attribute_t *xr_attr;
const char *rcvr_rtt_mode;
sal_init_rtcp_xr_description(config);
xr_attr = BELLE_SDP_RTCP_XR_ATTRIBUTE(attribute);
rcvr_rtt_mode = belle_sdp_rtcp_xr_attribute_get_rcvr_rtt_mode(xr_attr);
if (rcvr_rtt_mode != NULL) {
if (strcasecmp(rcvr_rtt_mode, "all") == 0) {
config->rcvr_rtt_mode = OrtpRtcpXrRcvrRttAll;
} else if (strcasecmp(rcvr_rtt_mode, "sender") == 0) {
config->rcvr_rtt_mode = OrtpRtcpXrRcvrRttSender;
}
config->rcvr_rtt_max_size = belle_sdp_rtcp_xr_attribute_get_rcvr_rtt_max_size(xr_attr);
}
config->stat_summary_enabled = (belle_sdp_rtcp_xr_attribute_has_stat_summary(xr_attr) != 0);
if (config->stat_summary_enabled) {
const belle_sip_list_t *stat_summary_flag_it;
for (stat_summary_flag_it = belle_sdp_rtcp_xr_attribute_get_stat_summary_flags(xr_attr); stat_summary_flag_it != NULL; stat_summary_flag_it = stat_summary_flag_it->next ) {
const char *flag = (const char *)stat_summary_flag_it->data;
if (flag != NULL) {
if (strcasecmp(flag, "loss") == 0) config->stat_summary_flags |= OrtpRtcpXrStatSummaryLoss;
else if (strcasecmp(flag, "dup") == 0) config->stat_summary_flags |= OrtpRtcpXrStatSummaryDup;
else if (strcasecmp(flag, "jitt") == 0) config->stat_summary_flags |= OrtpRtcpXrStatSummaryJitt;
else if (strcasecmp(flag, "TTL") == 0) config->stat_summary_flags |= OrtpRtcpXrStatSummaryTTL;
else if (strcasecmp(flag, "HL") == 0) config->stat_summary_flags |= OrtpRtcpXrStatSummaryHL;
}
}
}
config->voip_metrics_enabled = (belle_sdp_rtcp_xr_attribute_has_voip_metrics(xr_attr) != 0);
config->enabled = TRUE;
}
}
static void sdp_parse_session_rtcp_xr_parameters(belle_sdp_session_description_t *session_desc, OrtpRtcpXrConfiguration *config) {
const belle_sdp_attribute_t *attribute = belle_sdp_session_description_get_attribute(session_desc, "rtcp-xr");
sdp_parse_rtcp_xr_parameters(attribute, config);
}
static void sdp_parse_media_rtcp_xr_parameters(belle_sdp_media_description_t *media_desc, OrtpRtcpXrConfiguration *config) {
const belle_sdp_attribute_t *attribute = belle_sdp_media_description_get_attribute(media_desc, "rtcp-xr");
sdp_parse_rtcp_xr_parameters(attribute, config);
}
static SalStreamDescription * sdp_to_stream_description(SalMediaDescription *md, belle_sdp_media_description_t *media_desc) {
SalStreamDescription *stream;
belle_sdp_connection_t* cnx;
belle_sdp_media_t* media;
belle_sdp_attribute_t* attribute;
belle_sip_list_t *custom_attribute_it;
const char* value;
const char *mtype,*proto;
bool_t has_avpf_attributes;
stream=&md->streams[md->nb_streams];
media=belle_sdp_media_description_get_media ( media_desc );
proto = belle_sdp_media_get_protocol ( media );
stream->proto=SalProtoOther;
if ( proto ) {
if (strcasecmp(proto, "RTP/AVP") == 0) {
stream->proto = SalProtoRtpAvp;
} else if (strcasecmp(proto, "RTP/SAVP") == 0) {
stream->proto = SalProtoRtpSavp;
} else if (strcasecmp(proto, "RTP/AVPF") == 0) {
stream->proto = SalProtoRtpAvpf;
} else if (strcasecmp(proto, "RTP/SAVPF") == 0) {
stream->proto = SalProtoRtpSavpf;
} else if (strcasecmp(proto, "UDP/TLS/RTP/SAVP") == 0) {
stream->proto = SalProtoUdpTlsRtpSavp;
} else if (strcasecmp(proto, "UDP/TLS/RTP/SAVPF") == 0) {
stream->proto = SalProtoUdpTlsRtpSavpf;
} else {
strncpy(stream->proto_other,proto,sizeof(stream->proto_other)-1);
}
}
if ( ( cnx=belle_sdp_media_description_get_connection ( media_desc ) ) && belle_sdp_connection_get_address ( cnx ) ) {
strncpy ( stream->rtp_addr,belle_sdp_connection_get_address ( cnx ), sizeof ( stream->rtp_addr ) -1 );
stream->ttl=belle_sdp_connection_get_ttl(cnx);
}
stream->rtp_port=belle_sdp_media_get_media_port ( media );
mtype = belle_sdp_media_get_media_type ( media );
if ( strcasecmp ( "audio", mtype ) == 0 ) {
stream->type=SalAudio;
} else if ( strcasecmp ( "video", mtype ) == 0 ) {
stream->type=SalVideo;
} else if ( strcasecmp ( "text", mtype ) == 0 ) {
stream->type=SalText;
} else {
stream->type=SalOther;
strncpy ( stream->typeother,mtype,sizeof ( stream->typeother )-1 );
}
if ( belle_sdp_media_description_get_bandwidth ( media_desc,"AS" ) >0 ) {
stream->bandwidth=belle_sdp_media_description_get_bandwidth ( media_desc,"AS" );
}
if ( belle_sdp_media_description_get_attribute ( media_desc,"sendrecv" ) ) {
stream->dir=SalStreamSendRecv;
} else if ( belle_sdp_media_description_get_attribute ( media_desc,"sendonly" ) ) {
stream->dir=SalStreamSendOnly;
} else if ( belle_sdp_media_description_get_attribute ( media_desc,"recvonly" ) ) {
stream->dir=SalStreamRecvOnly;
} else if ( belle_sdp_media_description_get_attribute ( media_desc,"inactive" ) ) {
stream->dir=SalStreamInactive;
} else {
stream->dir=md->dir; /*takes default value if not present*/
}
stream->rtcp_mux = belle_sdp_media_description_get_attribute(media_desc, "rtcp-mux") != NULL;
/* Get media payload types */
sdp_parse_payload_types(media_desc, stream);
/* Get media specific RTCP attribute */
stream->rtcp_port = stream->rtp_port + 1;
snprintf(stream->rtcp_addr, sizeof(stream->rtcp_addr), "%s", stream->rtp_addr);
attribute=belle_sdp_media_description_get_attribute(media_desc,"rtcp");
if (attribute && (value=belle_sdp_attribute_get_value(attribute))!=NULL){
char tmp[256];
int nb = sscanf(value, "%d IN IP4 %s", &stream->rtcp_port, tmp);
if (nb == 1) {
/* SDP rtcp attribute only contains the port */
} else if (nb == 2) {
strncpy(stream->rtcp_addr, tmp, sizeof(stream->rtcp_addr)-1);
} else {
ms_warning("sdp has a strange a=rtcp line (%s) nb=%i", value, nb);
}
}
/* Read DTLS specific attributes : check is some are found in the stream description otherwise copy the session description one(which are at least set to Invalid) */
if (((stream->proto == SalProtoUdpTlsRtpSavpf) || (stream->proto == SalProtoUdpTlsRtpSavp))) {
attribute=belle_sdp_media_description_get_attribute(media_desc,"setup");
if (attribute && (value=belle_sdp_attribute_get_value(attribute))!=NULL){
if (strncmp(value, "actpass", 7) == 0) {
stream->dtls_role = SalDtlsRoleUnset;
} else if (strncmp(value, "active", 6) == 0) {
stream->dtls_role = SalDtlsRoleIsClient;
} else if (strncmp(value, "passive", 7) == 0) {
stream->dtls_role = SalDtlsRoleIsServer;
}
}
if (stream->dtls_role != SalDtlsRoleInvalid && (attribute=belle_sdp_media_description_get_attribute(media_desc,"fingerprint"))) {
strncpy(stream->dtls_fingerprint, belle_sdp_attribute_get_value(attribute),sizeof(stream->dtls_fingerprint));
}
}
/* Read crypto lines if any */
if (sal_stream_description_has_srtp(stream)) {
sdp_parse_media_crypto_parameters(media_desc, stream);
}
/* Read zrtp-hash attribute */
if ((attribute=belle_sdp_media_description_get_attribute(media_desc,"zrtp-hash"))!=NULL) {
if ((value=belle_sdp_attribute_get_value(attribute))!=NULL) {
strncpy((char *)(stream->zrtphash), belle_sdp_attribute_get_value(attribute),sizeof(stream->zrtphash));
stream->haveZrtpHash = 1;
}
}
/* Get ICE candidate attributes if any */
sdp_parse_media_ice_parameters(media_desc, stream);
has_avpf_attributes = sdp_parse_rtcp_fb_parameters(media_desc, stream);
/* Get RTCP-FB attributes if any */
if (sal_stream_description_has_avpf(stream)) {
enable_avpf_for_stream(stream);
}else if (has_avpf_attributes ){
enable_avpf_for_stream(stream);
stream->implicit_rtcp_fb = TRUE;
}
/* Get RTCP-XR attributes if any */
stream->rtcp_xr = md->rtcp_xr; // Use session parameters if no stream parameters are defined
sdp_parse_media_rtcp_xr_parameters(media_desc, &stream->rtcp_xr);
/* Get the custom attributes */
for (custom_attribute_it = belle_sdp_media_description_get_attributes(media_desc); custom_attribute_it != NULL; custom_attribute_it = custom_attribute_it->next) {
belle_sdp_attribute_t *attr = (belle_sdp_attribute_t *)custom_attribute_it->data;
stream->custom_sdp_attributes = sal_custom_sdp_attribute_append(stream->custom_sdp_attributes, belle_sdp_attribute_get_name(attr), belle_sdp_attribute_get_value(attr));
}
md->nb_streams++;
return stream;
}
int sdp_to_media_description ( belle_sdp_session_description_t *session_desc, SalMediaDescription *desc ) {
belle_sdp_connection_t* cnx;
belle_sip_list_t* media_desc_it;
belle_sdp_media_description_t* media_desc;
belle_sdp_session_name_t *sname;
belle_sip_list_t *custom_attribute_it;
const char* value;
SalDtlsRole session_role=SalDtlsRoleInvalid;
int i;
desc->nb_streams = 0;
desc->dir = SalStreamSendRecv;
if ( ( cnx=belle_sdp_session_description_get_connection ( session_desc ) ) && belle_sdp_connection_get_address ( cnx ) ) {
strncpy ( desc->addr,belle_sdp_connection_get_address ( cnx ),sizeof ( desc->addr ) -1 );
}
if ( (sname=belle_sdp_session_description_get_session_name(session_desc)) && belle_sdp_session_name_get_value(sname) ){
strncpy(desc->name,belle_sdp_session_name_get_value(sname),sizeof(desc->name) - 1);
}
if ( belle_sdp_session_description_get_bandwidth ( session_desc,"AS" ) >0 ) {
desc->bandwidth=belle_sdp_session_description_get_bandwidth ( session_desc,"AS" );
}
/*in some very rare case, session attribute may set stream dir*/
if ( belle_sdp_session_description_get_attribute ( session_desc,"sendrecv" ) ) {
desc->dir=SalStreamSendRecv;
} else if ( belle_sdp_session_description_get_attribute ( session_desc,"sendonly" ) ) {
desc->dir=SalStreamSendOnly;
} else if ( belle_sdp_session_description_get_attribute ( session_desc,"recvonly" ) ) {
desc->dir=SalStreamRecvOnly;
} else if ( belle_sdp_session_description_get_attribute ( session_desc,"inactive" ) ) {
desc->dir=SalStreamInactive;
}
/*DTLS attributes can be defined at session level.*/
value=belle_sdp_session_description_get_attribute_value(session_desc,"setup");
if (value){
if (strncmp(value, "actpass", 7) == 0) {
session_role = SalDtlsRoleUnset;
} else if (strncmp(value, "active", 6) == 0) {
session_role = SalDtlsRoleIsClient;
} else if (strncmp(value, "passive", 7) == 0) {
session_role = SalDtlsRoleIsServer;
}
}
value=belle_sdp_session_description_get_attribute_value(session_desc,"fingerprint");
/*copy dtls attributes to every streams, might be overwritten stream by stream*/
for (i=0;i<SAL_MEDIA_DESCRIPTION_MAX_STREAMS;i++) {
if (value)
strncpy(desc->streams[i].dtls_fingerprint, value, sizeof(desc->streams[i].dtls_fingerprint));
desc->streams[i].dtls_role=session_role; /*set or reset value*/
}
/* Get ICE remote ufrag and remote pwd, and ice_lite flag */
value=belle_sdp_session_description_get_attribute_value(session_desc,"ice-ufrag");
if (value) strncpy(desc->ice_ufrag, value, sizeof(desc->ice_ufrag) - 1);
value=belle_sdp_session_description_get_attribute_value(session_desc,"ice-pwd");
if (value) strncpy(desc->ice_pwd, value, sizeof(desc->ice_pwd)-1);
value=belle_sdp_session_description_get_attribute_value(session_desc,"ice-lite");
if (value) desc->ice_lite = TRUE;
/* Get session RTCP-XR attributes if any */
sdp_parse_session_rtcp_xr_parameters(session_desc, &desc->rtcp_xr);
/* Get the custom attributes */
for (custom_attribute_it = belle_sdp_session_description_get_attributes(session_desc); custom_attribute_it != NULL; custom_attribute_it = custom_attribute_it->next) {
belle_sdp_attribute_t *attr = (belle_sdp_attribute_t *)custom_attribute_it->data;
desc->custom_sdp_attributes = sal_custom_sdp_attribute_append(desc->custom_sdp_attributes, belle_sdp_attribute_get_name(attr), belle_sdp_attribute_get_value(attr));
}
for ( media_desc_it=belle_sdp_session_description_get_media_descriptions ( session_desc )
; media_desc_it!=NULL
; media_desc_it=media_desc_it->next ) {
if (desc->nb_streams==SAL_MEDIA_DESCRIPTION_MAX_STREAMS){
ms_warning("Cannot convert mline at position [%i] from SDP to SalMediaDescription",desc->nb_streams);
break;
}
media_desc=BELLE_SDP_MEDIA_DESCRIPTION ( media_desc_it->data );
sdp_to_stream_description(desc, media_desc);
}
return 0;
}
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