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webrtc: handle an ice-lite remote offer

Browse source 
When the remote peer offers an ice-lite SDP, we need to configure our
ICE negotiation to be in controlling mode as the peer will not be.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1304>
This commit is contained in:
Matthew Waters 2020-05-25 13:10:20 +10:00
parent 06f3a0ed2c
commit 67ae885d4c
3 changed files with 25 additions and 7 deletions
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23
ext/webrtc/gstwebrtcbin.c
View file

@ -2756,9 +2756,6 @@ _create_offer_task (GstWebRTCBin * webrtc, const GstStructure * options)
/* FIXME: pre-emptively setup receiving elements when needed */
/* XXX: only true for the initial offerer */
g_object_set (webrtc->priv->ice, "controller", TRUE, NULL);
g_list_free (seen_transceivers);
if (webrtc->priv->last_generated_answer)
@ -4465,7 +4462,25 @@ _set_description_task (GstWebRTCBin * webrtc, struct set_description *sd)
signalling_state_changed = TRUE;
}
if (webrtc->signaling_state == GST_WEBRTC_SIGNALING_STATE_STABLE) {
{
gboolean ice_controller = FALSE;
/* we control ice negotiation if we send the initial offer */
ice_controller |=
new_signaling_state == GST_WEBRTC_SIGNALING_STATE_HAVE_REMOTE_OFFER
&& webrtc->current_remote_description == NULL;
/* or, if the remote is an ice-lite peer */
ice_controller |= new_signaling_state == GST_WEBRTC_SIGNALING_STATE_STABLE
&& webrtc->current_remote_description->type == GST_WEBRTC_SDP_TYPE_OFFER
&& _message_has_attribute_key (webrtc->current_remote_description->sdp,
"ice-lite");
GST_DEBUG_OBJECT (webrtc, "we are in ice controlling mode: %s",
ice_controller ? "true" : "false");
g_object_set (webrtc->priv->ice, "controller", ice_controller, NULL);
}
if (new_signaling_state == GST_WEBRTC_SIGNALING_STATE_STABLE) {
GList *tmp;
/* media modifications */

6
ext/webrtc/webrtcsdp.c
View file

@ -144,9 +144,8 @@ _check_sdp_crypto (SDPSource source, GstWebRTCSessionDescription * sdp,
return TRUE;
}
#if 0
static gboolean
_session_has_attribute_key (const GstSDPMessage * msg, const gchar * key)
gboolean
_message_has_attribute_key (const GstSDPMessage * msg, const gchar * key)
{
int i;
for (i = 0; i < gst_sdp_message_attributes_len (msg); i++) {
@ -159,6 +158,7 @@ _session_has_attribute_key (const GstSDPMessage * msg, const gchar * key)
return FALSE;
}
#if 0
static gboolean
_session_has_attribute_key_value (const GstSDPMessage * msg, const gchar * key,
const gchar * value)

3
ext/webrtc/webrtcsdp.h
View file

@ -91,6 +91,9 @@ gboolean _message_media_is_datachannel (con
guint media_id);
G_GNUC_INTERNAL
guint _message_get_datachannel_index (const GstSDPMessage * msg);
G_GNUC_INTERNAL
gboolean _message_has_attribute_key (const GstSDPMessage * msg,
const gchar * key);
G_GNUC_INTERNAL
gboolean _get_bundle_index (GstSDPMessage * sdp,