/* Create complete answer for remote's offer. */
static pj_status_t create_answer( pj_pool_t *pool,
pj_bool_t prefer_remote_codec_order,
const pjmedia_sdp_session *initial,
const pjmedia_sdp_session *offer,
pjmedia_sdp_session **p_answer)
{
pj_status_t status = PJMEDIA_SDPNEG_ENOMEDIA;
pj_bool_t has_active = PJ_FALSE;
pjmedia_sdp_session *answer;
char media_used[PJMEDIA_MAX_SDP_MEDIA];
unsigned i;
/* Validate remote offer.
* This should have been validated before.
*/
PJ_ASSERT_RETURN((status=pjmedia_sdp_validate(offer))==PJ_SUCCESS, status);
/* Create initial answer by duplicating initial SDP,
* but clear all media lines. The media lines will be filled up later.
*/
answer = pjmedia_sdp_session_clone(pool, initial);
PJ_ASSERT_RETURN(answer != NULL, PJ_ENOMEM);
answer->media_count = 0;
pj_bzero(media_used, sizeof(media_used));
/* For each media line, create our answer based on our initial
* capability.
*/
for (i=0; i<offer->media_count; ++i) {
const pjmedia_sdp_media *om; /* offer */
const pjmedia_sdp_media *im; /* initial media */
pjmedia_sdp_media *am = NULL; /* answer/result */
unsigned j;
om = offer->media[i];
/* Find media description in our initial capability that matches
* the media type and transport type of offer's media, has
* matching codec, and has not been used to answer other offer.
*/
for (im=NULL, j=0; j<initial->media_count; ++j) {
im = initial->media[j];
if (pj_strcmp(&om->desc.media, &im->desc.media)==0 &&
pj_strcmp(&om->desc.transport, &im->desc.transport)==0 &&
media_used[j] == 0)
{
/* See if it has matching codec. */
if (prefer_remote_codec_order) {
status = match_offer(pool, om, im, im, &am);
} else {
status = match_offer(pool, im, om, im, &am);
}
if (status == PJ_SUCCESS) {
/* Mark media as used. */
media_used[j] = 1;
break;
}
}
}
if (j==initial->media_count) {
/* No matching media.
* Reject the offer by setting the port to zero in the answer.
*/
//pjmedia_sdp_attr *a;
/* For simplicity in the construction of the answer, we'll
* just clone the media from the offer. Anyway receiver will
* ignore anything in the media once it sees that the port
* number is zero.
*/
am = pjmedia_sdp_media_clone(pool, om);
am->desc.port = 0;
// Just set port zero to disable stream without set it to inactive.
/* Remove direction attribute, and replace with inactive */
remove_all_media_directions(am);
//a = pjmedia_sdp_attr_create(pool, "inactive", NULL);
//pjmedia_sdp_media_add_attr(am, a);
/* Then update direction */
update_media_direction(pool, om, am);
} else {
/* The answer is in am */
pj_assert(am != NULL);
}
/* Add the media answer */
answer->media[answer->media_count++] = am;
/* Check if this media is active.*/
if (am->desc.port != 0)
has_active = PJ_TRUE;
}
*p_answer = answer;
return has_active ? PJ_SUCCESS : status;
}
int tdav_session_msrp_set_ro(tmedia_session_t* self, const tsdp_header_M_t* m)
{
tdav_session_msrp_t* msrp;
const tsdp_header_A_t* A;
tsk_bool_t answer;
TSK_DEBUG_INFO("tdav_session_msrp_set_ro");
if(!self || !m){
TSK_DEBUG_ERROR("Invalid parameter");
return -1;
}
msrp = (tdav_session_msrp_t*)self;
// answer or initial offer?
answer = (self->M.lo != tsk_null);
/* update remote offer */
TSK_OBJECT_SAFE_FREE(self->M.ro);
self->M.ro = tsk_object_ref((void*)m);
if(self->M.lo){
if((match_offer(msrp, m))){
}
else{
TSK_DEBUG_ERROR("MSRP offer doesn't match");
return -1;
}
/* QoS */
if(self->qos){
tmedia_qos_tline_t* ro_tline;
if(self->M.ro && (ro_tline = tmedia_qos_tline_from_sdp(self->M.ro))){
tmedia_qos_tline_set_ro(self->qos, ro_tline);
TSK_OBJECT_SAFE_FREE(ro_tline);
}
}
}
/* To-Path */
if((A = tsdp_header_M_findA(m, "path"))){
tmsrp_uri_t* uri;
if((uri = tmsrp_uri_parse(A->value, tsk_strlen(A->value)))){
TSK_OBJECT_SAFE_FREE(msrp->config->To_Path);
msrp->config->To_Path = tmsrp_header_To_Path_create(uri);
TSK_OBJECT_SAFE_FREE(uri);
}
}
// OMA-TS-SIMPLE_IM-V1_0-20080903-C - 5.8.1 Negotiate direction of the MSRP connection setup
if((A = tsdp_header_M_findA(m, "setup"))){
tdav_msrp_setup_t setup = setup_from_string(A->value);
switch(setup){
case msrp_setup_actpass:
case msrp_setup_passive:
msrp->setup = msrp_setup_active;
break;
case msrp_setup_active:
msrp->setup = msrp_setup_passive;
break;
}
}
/* Neg parameters */
init_neg_types(msrp, m);
/* [OMA-TS-SIMPLE_IM-V1_0-20100322-C] - 5.8.2 Support of Application Level Gateway */
/* get connection associated to this media line
* If the connnection is global, then the manager will call tdav_session_audio_set() */
if(m->C && m->C->addr && !msrp->remote_ip){
tsk_strupdate(&msrp->remote_ip, m->C->addr);
msrp->useIPv6 = tsk_striequals(m->C->addrtype, "IP6");
}
/* set remote port */
msrp->remote_port = m->port;
return 0;
}
