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webrtcbin: Try to match an existing transceiver on pad request

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This should avoid creating extra transceivers that are duplicated.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2104>
This commit is contained in:
Olivier Crête 2021-03-26 20:55:36 -04:00
parent 2ca4cea538
commit 5971a96109
2 changed files with 47 additions and 0 deletions
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46
ext/webrtc/gstwebrtcbin.c
View file

@ -6373,6 +6373,52 @@ gst_webrtc_bin_request_new_pad (GstElement * element, GstPadTemplate * templ,
}
}
/* Let's try to find a free transceiver that matches */
if (!trans) {
GstWebRTCKind kind = GST_WEBRTC_KIND_UNKNOWN;
guint i;
if (caps)
kind = _kind_from_caps (caps);
for (i = 0; i < webrtc->priv->transceivers->len; i++) {
GstWebRTCRTPTransceiver *tmptrans =
g_ptr_array_index (webrtc->priv->transceivers, i);
GstWebRTCBinPad *pad2;
/* Ignore transceivers with a non-matching kind */
if (tmptrans->kind != GST_WEBRTC_KIND_UNKNOWN &&
kind != GST_WEBRTC_KIND_UNKNOWN && tmptrans->kind != kind)
continue;
/* Ignore stopped transmitters */
if (tmptrans->stopped)
continue;
/* Ignore transceivers that are only for receiving ... */
if (tmptrans->direction == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_RECVONLY
|| tmptrans->direction ==
GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_INACTIVE)
continue;
/* Ignore transceivers that already have a pad allocated */
pad2 = _find_pad_for_transceiver (webrtc, GST_PAD_SINK, tmptrans);
if (pad2) {
gst_object_unref (pad2);
continue;
}
/* Ignore transceivers with non-matching caps */
if (caps && tmptrans->codec_preferences &&
!gst_caps_can_intersect (caps, tmptrans->codec_preferences)) {
continue;
}
trans = tmptrans;
break;
}
}
if (!trans) {
trans = GST_WEBRTC_RTP_TRANSCEIVER (_create_webrtc_transceiver (webrtc,
GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_SENDRECV, -1));

1
tests/check/elements/webrtcbin.c
View file

@ -1702,6 +1702,7 @@ GST_START_TEST (test_recvonly_sendonly)
t->harnesses = g_list_prepend (t->harnesses, h);
g_signal_emit_by_name (t->webrtc1, "get-transceivers", &transceivers);
fail_unless (transceivers != NULL);
fail_unless_equals_int (transceivers->len, 2);
trans = g_array_index (transceivers, GstWebRTCRTPTransceiver *, 1);
trans->direction = GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_SENDONLY;