/* Update single local media description to after receiving answer
* from remote.
*/
static pj_status_t process_m_answer( pj_pool_t *pool,
pjmedia_sdp_media *offer,
pjmedia_sdp_media *answer,
pj_bool_t allow_asym)
{
unsigned i;
/* Check that the media type match our offer. */
if (pj_strcmp(&answer->desc.media, &offer->desc.media)!=0) {
/* The media type in the answer is different than the offer! */
return PJMEDIA_SDPNEG_EINVANSMEDIA;
}
/* Check that transport in the answer match our offer. */
/* At this point, transport type must be compatible,
* the transport instance will do more validation later.
*/
if (pjmedia_sdp_transport_cmp(&answer->desc.transport,
&offer->desc.transport)
!= PJ_SUCCESS)
{
return PJMEDIA_SDPNEG_EINVANSTP;
}
/* Check if remote has rejected our offer */
if (answer->desc.port == 0) {
/* Remote has rejected our offer.
* Set our port to zero too in active SDP.
*/
offer->desc.port = 0;
}
/* Process direction attributes */
update_media_direction(pool, answer, offer);
/* If asymetric media is allowed, then just check that remote answer has
* codecs that are within the offer.
*
* Otherwise if asymetric media is not allowed, then we will choose only
* one codec in our initial offer to match the answer.
*/
if (allow_asym) {
for (i=0; i<answer->desc.fmt_count; ++i) {
unsigned j;
pj_str_t *rem_fmt = &answer->desc.fmt[i];
for (j=0; j<offer->desc.fmt_count; ++j) {
if (pj_strcmp(rem_fmt, &answer->desc.fmt[j])==0)
break;
}
if (j != offer->desc.fmt_count) {
/* Found at least one common codec. */
break;
}
}
if (i == answer->desc.fmt_count) {
/* No common codec in the answer! */
return PJMEDIA_SDPNEG_EANSNOMEDIA;
}
PJ_TODO(CHECK_SDP_NEGOTIATION_WHEN_ASYMETRIC_MEDIA_IS_ALLOWED);
} else {
/* Remove all format in the offer that has no matching answer */
for (i=0; i<offer->desc.fmt_count;) {
unsigned pt;
pj_uint32_t j;
pj_str_t *fmt = &offer->desc.fmt[i];
/* Find matching answer */
pt = pj_strtoul(fmt);
if (pt < 96) {
for (j=0; j<answer->desc.fmt_count; ++j) {
if (pj_strcmp(fmt, &answer->desc.fmt[j])==0)
break;
}
} else {
/* This is dynamic payload type.
* For dynamic payload type, we must look the rtpmap and
* compare the encoding name.
*/
const pjmedia_sdp_attr *a;
pjmedia_sdp_rtpmap or_;
/* Get the rtpmap for the payload type in the offer. */
a = pjmedia_sdp_media_find_attr2(offer, "rtpmap", fmt);
if (!a) {
pj_assert(!"Bug! Offer should have been validated");
return PJ_EBUG;
}
pjmedia_sdp_attr_get_rtpmap(a, &or_);
/* Find paylaod in answer SDP with matching
* encoding name and clock rate.
*/
for (j=0; j<answer->desc.fmt_count; ++j) {
a = pjmedia_sdp_media_find_attr2(answer, "rtpmap",
&answer->desc.fmt[j]);
if (a) {
pjmedia_sdp_rtpmap ar;
pjmedia_sdp_attr_get_rtpmap(a, &ar);
/* See if encoding name, clock rate, and channel
* count match
*/
if (!pj_stricmp(&or_.enc_name, &ar.enc_name) &&
or_.clock_rate == ar.clock_rate &&
(pj_stricmp(&or_.param, &ar.param)==0 ||
(ar.param.slen==1 && *ar.param.ptr=='1')))
{
/* Further check for G7221, negotiate bitrate. */
if (pj_strcmp2(&or_.enc_name, "G7221") == 0) {
if (match_g7221(offer, i, answer, j))
break;
} else {
/* Match! */
break;
}
}
}
}
}
if (j == answer->desc.fmt_count) {
/* This format has no matching answer.
* Remove it from our offer.
*/
pjmedia_sdp_attr *a;
/* Remove rtpmap associated with this format */
a = pjmedia_sdp_media_find_attr2(offer, "rtpmap", fmt);
if (a)
pjmedia_sdp_media_remove_attr(offer, a);
/* Remove fmtp associated with this format */
a = pjmedia_sdp_media_find_attr2(offer, "fmtp", fmt);
if (a)
pjmedia_sdp_media_remove_attr(offer, a);
/* Remove this format from offer's array */
pj_array_erase(offer->desc.fmt, sizeof(offer->desc.fmt[0]),
offer->desc.fmt_count, i);
--offer->desc.fmt_count;
} else {
++i;
}
}
/* Arrange format in the offer so the order match the priority
* in the answer
*/
for (i=0; i<answer->desc.fmt_count; ++i) {
unsigned j;
pj_str_t *fmt = &answer->desc.fmt[i];
for (j=i; j<offer->desc.fmt_count; ++j) {
if (pj_strcmp(fmt, &offer->desc.fmt[j])==0) {
str_swap(&offer->desc.fmt[i], &offer->desc.fmt[j]);
break;
}
}
}
}
/* Looks okay */
return PJ_SUCCESS;
}
/*
* Create stream info from SDP media line.
*/
PJ_DEF(pj_status_t) pjmedia_stream_info_from_sdp(
pjmedia_stream_info *si,
pj_pool_t *pool,
pjmedia_endpt *endpt,
const pjmedia_sdp_session *local,
const pjmedia_sdp_session *remote,
unsigned stream_idx)
{
pjmedia_codec_mgr *mgr;
const pjmedia_sdp_attr *attr;
const pjmedia_sdp_media *local_m;
const pjmedia_sdp_media *rem_m;
const pjmedia_sdp_conn *local_conn;
const pjmedia_sdp_conn *rem_conn;
int rem_af, local_af;
pj_sockaddr local_addr;
pjmedia_sdp_rtpmap *rtpmap;
unsigned i, pt, fmti;
pj_status_t status;
/* Validate arguments: */
PJ_ASSERT_RETURN(pool && si && local && remote, PJ_EINVAL);
PJ_ASSERT_RETURN(stream_idx < local->media_count, PJ_EINVAL);
PJ_ASSERT_RETURN(stream_idx < remote->media_count, PJ_EINVAL);
/* Get codec manager. */
mgr = pjmedia_endpt_get_codec_mgr(endpt);
/* Keep SDP shortcuts */
local_m = local->media[stream_idx];
rem_m = remote->media[stream_idx];
local_conn = local_m->conn ? local_m->conn : local->conn;
if (local_conn == NULL)
return PJMEDIA_SDP_EMISSINGCONN;
rem_conn = rem_m->conn ? rem_m->conn : remote->conn;
if (rem_conn == NULL)
return PJMEDIA_SDP_EMISSINGCONN;
/* Reset: */
pj_bzero(si, sizeof(*si));
#if PJMEDIA_HAS_RTCP_XR && PJMEDIA_STREAM_ENABLE_XR
/* Set default RTCP XR enabled/disabled */
si->rtcp_xr_enabled = PJ_TRUE;
#endif
/* Media type: */
if (pj_stricmp(&local_m->desc.media, &ID_AUDIO) == 0) {
si->type = PJMEDIA_TYPE_AUDIO;
} else if (pj_stricmp(&local_m->desc.media, &ID_VIDEO) == 0) {
si->type = PJMEDIA_TYPE_VIDEO;
} else {
si->type = PJMEDIA_TYPE_UNKNOWN;
/* Avoid rejecting call because of unrecognized media,
* just return PJ_SUCCESS, this media will be deactivated later.
*/
//return PJMEDIA_EINVALIMEDIATYPE;
return PJ_SUCCESS;
}
/* Transport protocol */
/* At this point, transport type must be compatible,
* the transport instance will do more validation later.
*/
status = pjmedia_sdp_transport_cmp(&rem_m->desc.transport,
&local_m->desc.transport);
if (status != PJ_SUCCESS)
return PJMEDIA_SDPNEG_EINVANSTP;
if (pj_stricmp(&local_m->desc.transport, &ID_RTP_AVP) == 0) {
si->proto = PJMEDIA_TP_PROTO_RTP_AVP;
} else if (pj_stricmp(&local_m->desc.transport, &ID_RTP_SAVP) == 0) {
si->proto = PJMEDIA_TP_PROTO_RTP_SAVP;
} else {
si->proto = PJMEDIA_TP_PROTO_UNKNOWN;
return PJ_SUCCESS;
}
/* Check address family in remote SDP */
rem_af = pj_AF_UNSPEC();
if (pj_stricmp(&rem_conn->net_type, &ID_IN)==0) {
if (pj_stricmp(&rem_conn->addr_type, &ID_IP4)==0) {
rem_af = pj_AF_INET();
} else if (pj_stricmp(&rem_conn->addr_type, &ID_IP6)==0) {
rem_af = pj_AF_INET6();
}
}
if (rem_af==pj_AF_UNSPEC()) {
/* Unsupported address family */
return PJ_EAFNOTSUP;
}
/* Set remote address: */
status = pj_sockaddr_init(rem_af, &si->rem_addr, &rem_conn->addr,
rem_m->desc.port);
if (status != PJ_SUCCESS) {
/* Invalid IP address. */
return PJMEDIA_EINVALIDIP;
}
/* Check address family of local info */
local_af = pj_AF_UNSPEC();
if (pj_stricmp(&local_conn->net_type, &ID_IN)==0) {
if (pj_stricmp(&local_conn->addr_type, &ID_IP4)==0) {
local_af = pj_AF_INET();
} else if (pj_stricmp(&local_conn->addr_type, &ID_IP6)==0) {
local_af = pj_AF_INET6();
}
}
if (local_af==pj_AF_UNSPEC()) {
/* Unsupported address family */
return PJ_SUCCESS;
}
/* Set remote address: */
status = pj_sockaddr_init(local_af, &local_addr, &local_conn->addr,
local_m->desc.port);
if (status != PJ_SUCCESS) {
/* Invalid IP address. */
return PJMEDIA_EINVALIDIP;
}
/* Local and remote address family must match */
if (local_af != rem_af)
return PJ_EAFNOTSUP;
/* Media direction: */
if (local_m->desc.port == 0 ||
pj_sockaddr_has_addr(&local_addr)==PJ_FALSE ||
pj_sockaddr_has_addr(&si->rem_addr)==PJ_FALSE ||
pjmedia_sdp_media_find_attr(local_m, &STR_INACTIVE, NULL)!=NULL)
{
/* Inactive stream. */
si->dir = PJMEDIA_DIR_NONE;
} else if (pjmedia_sdp_media_find_attr(local_m, &STR_SENDONLY, NULL)!=NULL) {
/* Send only stream. */
si->dir = PJMEDIA_DIR_ENCODING;
} else if (pjmedia_sdp_media_find_attr(local_m, &STR_RECVONLY, NULL)!=NULL) {
/* Recv only stream. */
si->dir = PJMEDIA_DIR_DECODING;
} else {
/* Send and receive stream. */
si->dir = PJMEDIA_DIR_ENCODING_DECODING;
}
/* No need to do anything else if stream is rejected */
if (local_m->desc.port == 0) {
return PJ_SUCCESS;
}
/* If "rtcp" attribute is present in the SDP, set the RTCP address
* from that attribute. Otherwise, calculate from RTP address.
*/
attr = pjmedia_sdp_attr_find2(rem_m->attr_count, rem_m->attr,
"rtcp", NULL);
if (attr) {
pjmedia_sdp_rtcp_attr rtcp;
status = pjmedia_sdp_attr_get_rtcp(attr, &rtcp);
if (status == PJ_SUCCESS) {
if (rtcp.addr.slen) {
status = pj_sockaddr_init(rem_af, &si->rem_rtcp, &rtcp.addr,
(pj_uint16_t)rtcp.port);
} else {
pj_sockaddr_init(rem_af, &si->rem_rtcp, NULL,
(pj_uint16_t)rtcp.port);
pj_memcpy(pj_sockaddr_get_addr(&si->rem_rtcp),
pj_sockaddr_get_addr(&si->rem_addr),
pj_sockaddr_get_addr_len(&si->rem_addr));
}
}
}
if (!pj_sockaddr_has_addr(&si->rem_rtcp)) {
int rtcp_port;
pj_memcpy(&si->rem_rtcp, &si->rem_addr, sizeof(pj_sockaddr));
rtcp_port = pj_sockaddr_get_port(&si->rem_addr) + 1;
pj_sockaddr_set_port(&si->rem_rtcp, (pj_uint16_t)rtcp_port);
}
/* Get the payload number for receive channel. */
/*
Previously we used to rely on fmt[0] being the selected codec,
but some UA sends telephone-event as fmt[0] and this would
cause assert failure below.
Thanks Chris Hamilton <chamilton .at. cs.dal.ca> for this patch.
// And codec must be numeric!
if (!pj_isdigit(*local_m->desc.fmt[0].ptr) ||
!pj_isdigit(*rem_m->desc.fmt[0].ptr))
{
return PJMEDIA_EINVALIDPT;
}
pt = pj_strtoul(&local_m->desc.fmt[0]);
pj_assert(PJMEDIA_RTP_PT_TELEPHONE_EVENTS==0 ||
pt != PJMEDIA_RTP_PT_TELEPHONE_EVENTS);
*/
/* This is to suppress MSVC warning about uninitialized var */
pt = 0;
/* Find the first codec which is not telephone-event */
for ( fmti = 0; fmti < local_m->desc.fmt_count; ++fmti ) {
if ( !pj_isdigit(*local_m->desc.fmt[fmti].ptr) )
return PJMEDIA_EINVALIDPT;
pt = pj_strtoul(&local_m->desc.fmt[fmti]);
if ( PJMEDIA_RTP_PT_TELEPHONE_EVENTS == 0 ||
pt != PJMEDIA_RTP_PT_TELEPHONE_EVENTS )
break;
}
if ( fmti >= local_m->desc.fmt_count )
return PJMEDIA_EINVALIDPT;
/* Get codec info.
* For static payload types, get the info from codec manager.
* For dynamic payload types, MUST get the rtpmap.
*/
if (pt < 96) {
pj_bool_t has_rtpmap;
rtpmap = NULL;
has_rtpmap = PJ_TRUE;
attr = pjmedia_sdp_media_find_attr(local_m, &ID_RTPMAP,
&local_m->desc.fmt[fmti]);
if (attr == NULL) {
has_rtpmap = PJ_FALSE;
}
if (attr != NULL) {
status = pjmedia_sdp_attr_to_rtpmap(pool, attr, &rtpmap);
if (status != PJ_SUCCESS)
has_rtpmap = PJ_FALSE;
}
/* Build codec format info: */
if (has_rtpmap) {
si->fmt.type = si->type;
si->fmt.pt = pj_strtoul(&local_m->desc.fmt[fmti]);
pj_strdup(pool, &si->fmt.encoding_name, &rtpmap->enc_name);
si->fmt.clock_rate = rtpmap->clock_rate;
#if defined(PJMEDIA_HANDLE_G722_MPEG_BUG) && (PJMEDIA_HANDLE_G722_MPEG_BUG != 0)
/* The session info should have the actual clock rate, because
* this info is used for calculationg buffer size, etc in stream
*/
if (si->fmt.pt == PJMEDIA_RTP_PT_G722)
si->fmt.clock_rate = 16000;
#endif
/* For audio codecs, rtpmap parameters denotes the number of
* channels.
*/
if (si->type == PJMEDIA_TYPE_AUDIO && rtpmap->param.slen) {
si->fmt.channel_cnt = (unsigned) pj_strtoul(&rtpmap->param);
} else {
si->fmt.channel_cnt = 1;
}
} else {
const pjmedia_codec_info *p_info;
status = pjmedia_codec_mgr_get_codec_info( mgr, pt, &p_info);
if (status != PJ_SUCCESS)
return status;
pj_memcpy(&si->fmt, p_info, sizeof(pjmedia_codec_info));
}
/* For static payload type, pt's are symetric */
si->tx_pt = pt;
} else {
attr = pjmedia_sdp_media_find_attr(local_m, &ID_RTPMAP,
&local_m->desc.fmt[fmti]);
if (attr == NULL)
return PJMEDIA_EMISSINGRTPMAP;
status = pjmedia_sdp_attr_to_rtpmap(pool, attr, &rtpmap);
if (status != PJ_SUCCESS)
return status;
/* Build codec format info: */
si->fmt.type = si->type;
si->fmt.pt = pj_strtoul(&local_m->desc.fmt[fmti]);
pj_strdup(pool, &si->fmt.encoding_name, &rtpmap->enc_name);
si->fmt.clock_rate = rtpmap->clock_rate;
/* For audio codecs, rtpmap parameters denotes the number of
* channels.
*/
if (si->type == PJMEDIA_TYPE_AUDIO && rtpmap->param.slen) {
si->fmt.channel_cnt = (unsigned) pj_strtoul(&rtpmap->param);
} else {
si->fmt.channel_cnt = 1;
}
/* Determine payload type for outgoing channel, by finding
* dynamic payload type in remote SDP that matches the answer.
*/
si->tx_pt = 0xFFFF;
for (i=0; i<rem_m->desc.fmt_count; ++i) {
unsigned rpt;
pjmedia_sdp_attr *r_attr;
pjmedia_sdp_rtpmap r_rtpmap;
rpt = pj_strtoul(&rem_m->desc.fmt[i]);
if (rpt < 96)
continue;
r_attr = pjmedia_sdp_media_find_attr(rem_m, &ID_RTPMAP,
&rem_m->desc.fmt[i]);
if (!r_attr)
continue;
if (pjmedia_sdp_attr_get_rtpmap(r_attr, &r_rtpmap) != PJ_SUCCESS)
continue;
if (!pj_stricmp(&rtpmap->enc_name, &r_rtpmap.enc_name) &&
rtpmap->clock_rate == r_rtpmap.clock_rate)
{
/* Found matched codec. */
si->tx_pt = rpt;
break;
}
}
if (si->tx_pt == 0xFFFF)
return PJMEDIA_EMISSINGRTPMAP;
}
/* Now that we have codec info, get the codec param. */
si->param = PJ_POOL_ALLOC_T(pool, pjmedia_codec_param);
status = pjmedia_codec_mgr_get_default_param(mgr, &si->fmt, si->param);
/* Get remote fmtp for our encoder. */
parse_fmtp(pool, rem_m, si->tx_pt, &si->param->setting.enc_fmtp);
/* Get local fmtp for our decoder. */
parse_fmtp(pool, local_m, si->fmt.pt, &si->param->setting.dec_fmtp);
/* Get remote maxptime for our encoder. */
attr = pjmedia_sdp_attr_find2(rem_m->attr_count, rem_m->attr,
"maxptime", NULL);
if (attr) {
pj_str_t tmp_val = attr->value;
pj_strltrim(&tmp_val);
si->tx_maxptime = pj_strtoul(&tmp_val);
}
/* When direction is NONE (it means SDP negotiation has failed) we don't
* need to return a failure here, as returning failure will cause
* the whole SDP to be rejected. See ticket #:
* http://
*
* Thanks Alain Totouom
*/
if (status != PJ_SUCCESS && si->dir != PJMEDIA_DIR_NONE)
return status;
/* Get incomming payload type for telephone-events */
si->rx_event_pt = -1;
for (i=0; i<local_m->attr_count; ++i) {
pjmedia_sdp_rtpmap r;
attr = local_m->attr[i];
if (pj_strcmp(&attr->name, &ID_RTPMAP) != 0)
continue;
if (pjmedia_sdp_attr_get_rtpmap(attr, &r) != PJ_SUCCESS)
continue;
if (pj_strcmp(&r.enc_name, &ID_TELEPHONE_EVENT) == 0) {
si->rx_event_pt = pj_strtoul(&r.pt);
break;
}
}
/* Get outgoing payload type for telephone-events */
si->tx_event_pt = -1;
for (i=0; i<rem_m->attr_count; ++i) {
pjmedia_sdp_rtpmap r;
attr = rem_m->attr[i];
if (pj_strcmp(&attr->name, &ID_RTPMAP) != 0)
continue;
if (pjmedia_sdp_attr_get_rtpmap(attr, &r) != PJ_SUCCESS)
continue;
if (pj_strcmp(&r.enc_name, &ID_TELEPHONE_EVENT) == 0) {
si->tx_event_pt = pj_strtoul(&r.pt);
break;
}
}
/* Leave SSRC to random. */
si->ssrc = pj_rand();
/* Set default jitter buffer parameter. */
si->jb_init = si->jb_max = si->jb_min_pre = si->jb_max_pre = -1;
return PJ_SUCCESS;
}
/* Update single local media description to after receiving answer
* from remote.
*/
static pj_status_t process_m_answer( pj_pool_t *pool,
pjmedia_sdp_media *offer,
pjmedia_sdp_media *answer,
pj_bool_t allow_asym)
{
unsigned i;
/* Check that the media type match our offer. */
if (pj_strcmp(&answer->desc.media, &offer->desc.media)!=0) {
/* The media type in the answer is different than the offer! */
return PJMEDIA_SDPNEG_EINVANSMEDIA;
}
/* Check that transport in the answer match our offer. */
/* At this point, transport type must be compatible,
* the transport instance will do more validation later.
*/
if (pjmedia_sdp_transport_cmp(&answer->desc.transport,
&offer->desc.transport)
!= PJ_SUCCESS)
{
return PJMEDIA_SDPNEG_EINVANSTP;
}
/* Check if remote has rejected our offer */
if (answer->desc.port == 0) {
/* Remote has rejected our offer.
* Deactivate our media too.
*/
pjmedia_sdp_media_deactivate(pool, offer);
/* Don't need to proceed */
return PJ_SUCCESS;
}
/* Ticket #1148: check if remote answer does not set port to zero when
* offered with port zero. Let's just tolerate it.
*/
if (offer->desc.port == 0) {
/* Don't need to proceed */
return PJ_SUCCESS;
}
/* Process direction attributes */
update_media_direction(pool, answer, offer);
/* If asymetric media is allowed, then just check that remote answer has
* codecs that are within the offer.
*
* Otherwise if asymetric media is not allowed, then we will choose only
* one codec in our initial offer to match the answer.
*/
if (allow_asym) {
for (i=0; i<answer->desc.fmt_count; ++i) {
unsigned j;
pj_str_t *rem_fmt = &answer->desc.fmt[i];
for (j=0; j<offer->desc.fmt_count; ++j) {
if (pj_strcmp(rem_fmt, &answer->desc.fmt[j])==0)
break;
}
if (j != offer->desc.fmt_count) {
/* Found at least one common codec. */
break;
}
}
if (i == answer->desc.fmt_count) {
/* No common codec in the answer! */
return PJMEDIA_SDPNEG_EANSNOMEDIA;
}
PJ_TODO(CHECK_SDP_NEGOTIATION_WHEN_ASYMETRIC_MEDIA_IS_ALLOWED);
} else {
/* Offer format priority based on answer format index/priority */
unsigned offer_fmt_prior[PJMEDIA_MAX_SDP_FMT];
/* Remove all format in the offer that has no matching answer */
for (i=0; i<offer->desc.fmt_count;) {
unsigned pt;
pj_uint32_t j;
pj_str_t *fmt = &offer->desc.fmt[i];
/* Find matching answer */
pt = pj_strtoul(fmt);
if (pt < 96) {
for (j=0; j<answer->desc.fmt_count; ++j) {
if (pj_strcmp(fmt, &answer->desc.fmt[j])==0)
break;
}
} else {
/* This is dynamic payload type.
* For dynamic payload type, we must look the rtpmap and
* compare the encoding name.
*/
const pjmedia_sdp_attr *a;
pjmedia_sdp_rtpmap or_;
/* Get the rtpmap for the payload type in the offer. */
a = pjmedia_sdp_media_find_attr2(offer, "rtpmap", fmt);
if (!a) {
pj_assert(!"Bug! Offer should have been validated");
return PJ_EBUG;
}
pjmedia_sdp_attr_get_rtpmap(a, &or_);
/* Find paylaod in answer SDP with matching
* encoding name and clock rate.
*/
for (j=0; j<answer->desc.fmt_count; ++j) {
a = pjmedia_sdp_media_find_attr2(answer, "rtpmap",
&answer->desc.fmt[j]);
if (a) {
pjmedia_sdp_rtpmap ar;
pjmedia_sdp_attr_get_rtpmap(a, &ar);
/* See if encoding name, clock rate, and channel
* count match
*/
if (!pj_stricmp(&or_.enc_name, &ar.enc_name) &&
or_.clock_rate == ar.clock_rate &&
(pj_stricmp(&or_.param, &ar.param)==0 ||
(ar.param.slen==1 && *ar.param.ptr=='1')))
{
/* Call custom format matching callbacks */
if (custom_fmt_match(pool, &or_.enc_name,
offer, i, answer, j, 0) ==
PJ_SUCCESS)
{
/* Match! */
break;
}
}
}
}
}
if (j == answer->desc.fmt_count) {
/* This format has no matching answer.
* Remove it from our offer.
*/
pjmedia_sdp_attr *a;
/* Remove rtpmap associated with this format */
a = pjmedia_sdp_media_find_attr2(offer, "rtpmap", fmt);
if (a)
pjmedia_sdp_media_remove_attr(offer, a);
/* Remove fmtp associated with this format */
a = pjmedia_sdp_media_find_attr2(offer, "fmtp", fmt);
if (a)
pjmedia_sdp_media_remove_attr(offer, a);
/* Remove this format from offer's array */
pj_array_erase(offer->desc.fmt, sizeof(offer->desc.fmt[0]),
offer->desc.fmt_count, i);
--offer->desc.fmt_count;
} else {
offer_fmt_prior[i] = j;
++i;
}
}
if (0 == offer->desc.fmt_count) {
/* No common codec in the answer! */
return PJMEDIA_SDPNEG_EANSNOMEDIA;
}
/* Post process:
* - Resort offer formats so the order match to the answer.
* - Remove answer formats that unmatches to the offer.
*/
/* Resort offer formats */
for (i=0; i<offer->desc.fmt_count; ++i) {
unsigned j;
for (j=i+1; j<offer->desc.fmt_count; ++j) {
if (offer_fmt_prior[i] > offer_fmt_prior[j]) {
unsigned tmp = offer_fmt_prior[i];
offer_fmt_prior[i] = offer_fmt_prior[j];
offer_fmt_prior[j] = tmp;
str_swap(&offer->desc.fmt[i], &offer->desc.fmt[j]);
}
}
}
/* Remove unmatched answer formats */
{
unsigned del_cnt = 0;
for (i=0; i<answer->desc.fmt_count;) {
/* The offer is ordered now, also the offer_fmt_prior */
if (i >= offer->desc.fmt_count ||
offer_fmt_prior[i]-del_cnt != i)
{
pj_str_t *fmt = &answer->desc.fmt[i];
pjmedia_sdp_attr *a;
/* Remove rtpmap associated with this format */
a = pjmedia_sdp_media_find_attr2(answer, "rtpmap", fmt);
if (a)
pjmedia_sdp_media_remove_attr(answer, a);
/* Remove fmtp associated with this format */
a = pjmedia_sdp_media_find_attr2(answer, "fmtp", fmt);
if (a)
pjmedia_sdp_media_remove_attr(answer, a);
/* Remove this format from answer's array */
pj_array_erase(answer->desc.fmt,
sizeof(answer->desc.fmt[0]),
answer->desc.fmt_count, i);
--answer->desc.fmt_count;
++del_cnt;
} else {
++i;
}
}
}
}
/* Looks okay */
return PJ_SUCCESS;
}
/*
* Create stream info from SDP media line.
*/
PJ_DEF(pj_status_t) pjmedia_stream_info_from_sdp(
pjmedia_stream_info *si,
pj_pool_t *pool,
pjmedia_endpt *endpt,
const pjmedia_sdp_session *local,
const pjmedia_sdp_session *remote,
unsigned stream_idx)
{
const pj_str_t STR_INACTIVE = { "inactive", 8 };
const pj_str_t STR_SENDONLY = { "sendonly", 8 };
const pj_str_t STR_RECVONLY = { "recvonly", 8 };
pjmedia_codec_mgr *mgr;
const pjmedia_sdp_attr *attr;
const pjmedia_sdp_media *local_m;
const pjmedia_sdp_media *rem_m;
const pjmedia_sdp_conn *local_conn;
const pjmedia_sdp_conn *rem_conn;
int rem_af, local_af;
pj_sockaddr local_addr;
pj_status_t status;
/* Validate arguments: */
PJ_ASSERT_RETURN(pool && si && local && remote, PJ_EINVAL);
PJ_ASSERT_RETURN(stream_idx < local->media_count, PJ_EINVAL);
PJ_ASSERT_RETURN(stream_idx < remote->media_count, PJ_EINVAL);
/* Keep SDP shortcuts */
local_m = local->media[stream_idx];
rem_m = remote->media[stream_idx];
local_conn = local_m->conn ? local_m->conn : local->conn;
if (local_conn == NULL)
return PJMEDIA_SDP_EMISSINGCONN;
rem_conn = rem_m->conn ? rem_m->conn : remote->conn;
if (rem_conn == NULL)
return PJMEDIA_SDP_EMISSINGCONN;
/* Media type must be audio */
if (pj_stricmp(&local_m->desc.media, &ID_AUDIO) != 0)
return PJMEDIA_EINVALIMEDIATYPE;
/* Get codec manager. */
mgr = pjmedia_endpt_get_codec_mgr(endpt);
/* Reset: */
pj_bzero(si, sizeof(*si));
#if PJMEDIA_HAS_RTCP_XR && PJMEDIA_STREAM_ENABLE_XR
/* Set default RTCP XR enabled/disabled */
si->rtcp_xr_enabled = PJ_TRUE;
#endif
/* Media type: */
si->type = PJMEDIA_TYPE_AUDIO;
/* Transport protocol */
/* At this point, transport type must be compatible,
* the transport instance will do more validation later.
*/
status = pjmedia_sdp_transport_cmp(&rem_m->desc.transport,
&local_m->desc.transport);
if (status != PJ_SUCCESS)
return PJMEDIA_SDPNEG_EINVANSTP;
if (pj_stricmp(&local_m->desc.transport, &ID_RTP_AVP) == 0) {
si->proto = PJMEDIA_TP_PROTO_RTP_AVP;
} else if (pj_stricmp(&local_m->desc.transport, &ID_RTP_SAVP) == 0) {
si->proto = PJMEDIA_TP_PROTO_RTP_SAVP;
} else {
si->proto = PJMEDIA_TP_PROTO_UNKNOWN;
return PJ_SUCCESS;
}
/* Check address family in remote SDP */
rem_af = pj_AF_UNSPEC();
if (pj_stricmp(&rem_conn->net_type, &ID_IN)==0) {
if (pj_stricmp(&rem_conn->addr_type, &ID_IP4)==0) {
rem_af = pj_AF_INET();
} else if (pj_stricmp(&rem_conn->addr_type, &ID_IP6)==0) {
rem_af = pj_AF_INET6();
}
}
if (rem_af==pj_AF_UNSPEC()) {
/* Unsupported address family */
return PJ_EAFNOTSUP;
}
/* Set remote address: */
status = pj_sockaddr_init(rem_af, &si->rem_addr, &rem_conn->addr,
rem_m->desc.port);
if (status != PJ_SUCCESS) {
/* Invalid IP address. */
return PJMEDIA_EINVALIDIP;
}
/* Check address family of local info */
local_af = pj_AF_UNSPEC();
if (pj_stricmp(&local_conn->net_type, &ID_IN)==0) {
if (pj_stricmp(&local_conn->addr_type, &ID_IP4)==0) {
local_af = pj_AF_INET();
} else if (pj_stricmp(&local_conn->addr_type, &ID_IP6)==0) {
local_af = pj_AF_INET6();
}
}
if (local_af==pj_AF_UNSPEC()) {
/* Unsupported address family */
return PJ_SUCCESS;
}
/* Set remote address: */
status = pj_sockaddr_init(local_af, &local_addr, &local_conn->addr,
local_m->desc.port);
if (status != PJ_SUCCESS) {
/* Invalid IP address. */
return PJMEDIA_EINVALIDIP;
}
/* Local and remote address family must match */
if (local_af != rem_af)
return PJ_EAFNOTSUP;
/* Media direction: */
if (local_m->desc.port == 0 ||
pj_sockaddr_has_addr(&local_addr)==PJ_FALSE ||
pj_sockaddr_has_addr(&si->rem_addr)==PJ_FALSE ||
pjmedia_sdp_media_find_attr(local_m, &STR_INACTIVE, NULL)!=NULL)
{
/* Inactive stream. */
si->dir = PJMEDIA_DIR_NONE;
} else if (pjmedia_sdp_media_find_attr(local_m, &STR_SENDONLY, NULL)!=NULL) {
/* Send only stream. */
si->dir = PJMEDIA_DIR_ENCODING;
} else if (pjmedia_sdp_media_find_attr(local_m, &STR_RECVONLY, NULL)!=NULL) {
/* Recv only stream. */
si->dir = PJMEDIA_DIR_DECODING;
} else {
/* Send and receive stream. */
si->dir = PJMEDIA_DIR_ENCODING_DECODING;
}
/* No need to do anything else if stream is rejected */
if (local_m->desc.port == 0) {
return PJ_SUCCESS;
}
/* If "rtcp" attribute is present in the SDP, set the RTCP address
* from that attribute. Otherwise, calculate from RTP address.
*/
attr = pjmedia_sdp_attr_find2(rem_m->attr_count, rem_m->attr,
"rtcp", NULL);
if (attr) {
pjmedia_sdp_rtcp_attr rtcp;
status = pjmedia_sdp_attr_get_rtcp(attr, &rtcp);
if (status == PJ_SUCCESS) {
if (rtcp.addr.slen) {
status = pj_sockaddr_init(rem_af, &si->rem_rtcp, &rtcp.addr,
(pj_uint16_t)rtcp.port);
} else {
pj_sockaddr_init(rem_af, &si->rem_rtcp, NULL,
(pj_uint16_t)rtcp.port);
pj_memcpy(pj_sockaddr_get_addr(&si->rem_rtcp),
pj_sockaddr_get_addr(&si->rem_addr),
pj_sockaddr_get_addr_len(&si->rem_addr));
}
}
}
if (!pj_sockaddr_has_addr(&si->rem_rtcp)) {
int rtcp_port;
pj_memcpy(&si->rem_rtcp, &si->rem_addr, sizeof(pj_sockaddr));
rtcp_port = pj_sockaddr_get_port(&si->rem_addr) + 1;
pj_sockaddr_set_port(&si->rem_rtcp, (pj_uint16_t)rtcp_port);
}
/* Get the payload number for receive channel. */
/*
Previously we used to rely on fmt[0] being the selected codec,
but some UA sends telephone-event as fmt[0] and this would
cause assert failure below.
Thanks Chris Hamilton <chamilton .at. cs.dal.ca> for this patch.
// And codec must be numeric!
if (!pj_isdigit(*local_m->desc.fmt[0].ptr) ||
!pj_isdigit(*rem_m->desc.fmt[0].ptr))
{
return PJMEDIA_EINVALIDPT;
}
pt = pj_strtoul(&local_m->desc.fmt[0]);
pj_assert(PJMEDIA_RTP_PT_TELEPHONE_EVENTS==0 ||
pt != PJMEDIA_RTP_PT_TELEPHONE_EVENTS);
*/
/* Get codec info and param */
status = get_audio_codec_info_param(si, pool, mgr, local_m, rem_m);
/* Leave SSRC to random. */
si->ssrc = pj_rand();
/* Set default jitter buffer parameter. */
si->jb_init = si->jb_max = si->jb_min_pre = si->jb_max_pre = -1;
return status;
}
/*
* Create stream info from SDP media line.
*/
PJ_DEF(pj_status_t) pjmedia_vid_stream_info_from_sdp(
pjmedia_vid_stream_info *si,
pj_pool_t *pool,
pjmedia_endpt *endpt,
const pjmedia_sdp_session *local,
const pjmedia_sdp_session *remote,
unsigned stream_idx)
{
const pjmedia_sdp_attr *attr;
const pjmedia_sdp_media *local_m;
const pjmedia_sdp_media *rem_m;
const pjmedia_sdp_conn *local_conn;
const pjmedia_sdp_conn *rem_conn;
int rem_af, local_af;
pj_sockaddr local_addr;
pj_status_t status;
PJ_UNUSED_ARG(endpt);
/* Validate arguments: */
PJ_ASSERT_RETURN(pool && si && local && remote, PJ_EINVAL);
PJ_ASSERT_RETURN(stream_idx < local->media_count, PJ_EINVAL);
PJ_ASSERT_RETURN(stream_idx < remote->media_count, PJ_EINVAL);
/* Keep SDP shortcuts */
local_m = local->media[stream_idx];
rem_m = remote->media[stream_idx];
local_conn = local_m->conn ? local_m->conn : local->conn;
if (local_conn == NULL)
return PJMEDIA_SDP_EMISSINGCONN;
rem_conn = rem_m->conn ? rem_m->conn : remote->conn;
if (rem_conn == NULL)
return PJMEDIA_SDP_EMISSINGCONN;
/* Media type must be video */
if (pj_stricmp(&local_m->desc.media, &ID_VIDEO) != 0)
return PJMEDIA_EINVALIMEDIATYPE;
/* Reset: */
pj_bzero(si, sizeof(*si));
/* Media type: */
si->type = PJMEDIA_TYPE_VIDEO;
/* Transport protocol */
/* At this point, transport type must be compatible,
* the transport instance will do more validation later.
*/
status = pjmedia_sdp_transport_cmp(&rem_m->desc.transport,
&local_m->desc.transport);
if (status != PJ_SUCCESS)
return PJMEDIA_SDPNEG_EINVANSTP;
if (pj_stricmp(&local_m->desc.transport, &ID_RTP_AVP) == 0) {
si->proto = PJMEDIA_TP_PROTO_RTP_AVP;
} else if (pj_stricmp(&local_m->desc.transport, &ID_RTP_SAVP) == 0) {
si->proto = PJMEDIA_TP_PROTO_RTP_SAVP;
} else {
si->proto = PJMEDIA_TP_PROTO_UNKNOWN;
return PJ_SUCCESS;
}
/* Check address family in remote SDP */
rem_af = pj_AF_UNSPEC();
if (pj_stricmp(&rem_conn->net_type, &ID_IN)==0) {
if (pj_stricmp(&rem_conn->addr_type, &ID_IP4)==0) {
rem_af = pj_AF_INET();
} else if (pj_stricmp(&rem_conn->addr_type, &ID_IP6)==0) {
rem_af = pj_AF_INET6();
}
}
if (rem_af==pj_AF_UNSPEC()) {
/* Unsupported address family */
return PJ_EAFNOTSUP;
}
/* Set remote address: */
status = pj_sockaddr_init(rem_af, &si->rem_addr, &rem_conn->addr,
rem_m->desc.port);
if (status != PJ_SUCCESS) {
/* Invalid IP address. */
return PJMEDIA_EINVALIDIP;
}
/* Check address family of local info */
local_af = pj_AF_UNSPEC();
if (pj_stricmp(&local_conn->net_type, &ID_IN)==0) {
if (pj_stricmp(&local_conn->addr_type, &ID_IP4)==0) {
local_af = pj_AF_INET();
} else if (pj_stricmp(&local_conn->addr_type, &ID_IP6)==0) {
local_af = pj_AF_INET6();
}
}
if (local_af==pj_AF_UNSPEC()) {
/* Unsupported address family */
return PJ_SUCCESS;
}
/* Set remote address: */
status = pj_sockaddr_init(local_af, &local_addr, &local_conn->addr,
local_m->desc.port);
if (status != PJ_SUCCESS) {
/* Invalid IP address. */
return PJMEDIA_EINVALIDIP;
}
/* Local and remote address family must match */
if (local_af != rem_af)
return PJ_EAFNOTSUP;
/* Media direction: */
if (local_m->desc.port == 0 ||
pj_sockaddr_has_addr(&local_addr)==PJ_FALSE ||
pj_sockaddr_has_addr(&si->rem_addr)==PJ_FALSE ||
pjmedia_sdp_media_find_attr(local_m, &STR_INACTIVE, NULL)!=NULL)
{
/* Inactive stream. */
si->dir = PJMEDIA_DIR_NONE;
} else if (pjmedia_sdp_media_find_attr(local_m, &STR_SENDONLY, NULL)!=NULL) {
/* Send only stream. */
si->dir = PJMEDIA_DIR_ENCODING;
} else if (pjmedia_sdp_media_find_attr(local_m, &STR_RECVONLY, NULL)!=NULL) {
/* Recv only stream. */
si->dir = PJMEDIA_DIR_DECODING;
} else {
/* Send and receive stream. */
si->dir = PJMEDIA_DIR_ENCODING_DECODING;
}
/* No need to do anything else if stream is rejected */
if (local_m->desc.port == 0) {
return PJ_SUCCESS;
}
/* If "rtcp" attribute is present in the SDP, set the RTCP address
* from that attribute. Otherwise, calculate from RTP address.
*/
attr = pjmedia_sdp_attr_find2(rem_m->attr_count, rem_m->attr,
"rtcp", NULL);
if (attr) {
pjmedia_sdp_rtcp_attr rtcp;
status = pjmedia_sdp_attr_get_rtcp(attr, &rtcp);
if (status == PJ_SUCCESS) {
if (rtcp.addr.slen) {
status = pj_sockaddr_init(rem_af, &si->rem_rtcp, &rtcp.addr,
(pj_uint16_t)rtcp.port);
} else {
pj_sockaddr_init(rem_af, &si->rem_rtcp, NULL,
(pj_uint16_t)rtcp.port);
pj_memcpy(pj_sockaddr_get_addr(&si->rem_rtcp),
pj_sockaddr_get_addr(&si->rem_addr),
pj_sockaddr_get_addr_len(&si->rem_addr));
}
}
}
if (!pj_sockaddr_has_addr(&si->rem_rtcp)) {
int rtcp_port;
pj_memcpy(&si->rem_rtcp, &si->rem_addr, sizeof(pj_sockaddr));
rtcp_port = pj_sockaddr_get_port(&si->rem_addr) + 1;
pj_sockaddr_set_port(&si->rem_rtcp, (pj_uint16_t)rtcp_port);
}
/* Get codec info and param */
status = get_video_codec_info_param(si, pool, NULL, local_m, rem_m);
/* Leave SSRC to random. */
si->ssrc = pj_rand();
/* Set default jitter buffer parameter. */
si->jb_init = si->jb_max = si->jb_min_pre = si->jb_max_pre = -1;
return status;
}
