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WebRTC: Support non-trickle ICE candidates in the SDP

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Add any ICE candidates from the SDP before adding pending
trickle ICE candidates to support non-trickle peers

Fixes https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/issues/678
This commit is contained in:
Jan Schmidt 2020-01-13 02:30:07 +11:00
parent e188893963
commit 8e87fe42ad
1 changed files with 41 additions and 0 deletions
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41
ext/webrtc/gstwebrtcbin.c
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@ -3351,6 +3351,36 @@ _add_ice_candidate (GstWebRTCBin * webrtc, IceCandidateItem * item,
gst_webrtc_ice_add_candidate (webrtc->priv->ice, stream, item->candidate);
}
static void
_add_ice_candidates_from_sdp (GstWebRTCBin * webrtc, gint mlineindex,
const GstSDPMedia * media)
{
gint a;
GstWebRTCICEStream *stream = NULL;
for (a = 0; a < gst_sdp_media_attributes_len (media); a++) {
const GstSDPAttribute *attr = gst_sdp_media_get_attribute (media, a);
if (g_strcmp0 (attr->key, "candidate") == 0) {
gchar *candidate;
if (stream == NULL)
stream = _find_ice_stream_for_session (webrtc, mlineindex);
if (stream == NULL) {
GST_WARNING_OBJECT (webrtc,
"Unknown mline %u, dropping ICE candidates from SDP", mlineindex);
return;
}
candidate = g_strdup_printf ("a=candidate:%s", attr->value);
GST_LOG_OBJECT (webrtc, "adding ICE candidate with mline:%u, %s",
mlineindex, candidate);
gst_webrtc_ice_add_candidate (webrtc->priv->ice, stream, candidate);
g_free (candidate);
}
}
}
static gboolean
_filter_sdp_fields (GQuark field_id, const GValue * value,
GstStructure * new_structure)
@ -4181,9 +4211,20 @@ _set_description_task (GstWebRTCBin * webrtc, struct set_description *sd)
gst_webrtc_ice_gather_candidates (webrtc->priv->ice, item->stream);
}
/* Add any pending trickle ICE candidates if we have both offer and answer */
if (webrtc->current_local_description && webrtc->current_remote_description) {
int i;
GstWebRTCSessionDescription *remote_sdp =
webrtc->current_remote_description;
/* Add any remote ICE candidates from the remote description to
* support non-trickle peers first */
for (i = 0; i < gst_sdp_message_medias_len (remote_sdp->sdp); i++) {
const GstSDPMedia *media = gst_sdp_message_get_media (remote_sdp->sdp, i);
_add_ice_candidates_from_sdp (webrtc, i, media);
}
for (i = 0; i < webrtc->priv->pending_ice_candidates->len; i++) {
IceCandidateItem *item =
g_array_index (webrtc->priv->pending_ice_candidates,