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webrtcbin: Take PC_LOCK when requesting new pad

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This is needed to avoid having the state change under us.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2104>
This commit is contained in:
Olivier Crête 2021-03-31 11:49:36 -04:00
parent 4a48e291ff
commit 572c2b6783
1 changed files with 14 additions and 7 deletions
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21
ext/webrtc/gstwebrtcbin.c
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@ -6356,7 +6356,8 @@ gst_webrtc_bin_request_new_pad (GstElement * element, GstPadTemplate * templ,
return NULL;
}
GST_OBJECT_LOCK (webrtc);
PC_LOCK (webrtc);
if (name == NULL || strlen (name) < 6 || !g_str_has_prefix (name, "sink_")) {
/* no name given when requesting the pad, use next available int */
serial = webrtc->priv->max_sink_pad_serial++;
@ -6365,7 +6366,6 @@ gst_webrtc_bin_request_new_pad (GstElement * element, GstPadTemplate * templ,
serial = g_ascii_strtoull (&name[5], NULL, 10);
lock_mline = TRUE;
}
GST_OBJECT_UNLOCK (webrtc);
if (lock_mline) {
GstWebRTCBinPad *pad2;
@ -6383,7 +6383,7 @@ gst_webrtc_bin_request_new_pad (GstElement * element, GstPadTemplate * templ,
" existing m-line %d, but the transceiver's direction is %s",
name, serial, direction);
g_free (direction);
return NULL;
goto error_out;
}
/* Reject transceivers that already have a pad allocated */
@ -6393,7 +6393,7 @@ gst_webrtc_bin_request_new_pad (GstElement * element, GstPadTemplate * templ,
" but the transceiver associated with this m-line already has pad"
" %s", name, serial, GST_PAD_NAME (pad2));
gst_object_unref (pad2);
return NULL;
goto error_out;
}
if (caps) {
@ -6403,7 +6403,7 @@ gst_webrtc_bin_request_new_pad (GstElement * element, GstPadTemplate * templ,
" existing m-line %d, but requested caps %" GST_PTR_FORMAT
" don't match existing codec preferences %" GST_PTR_FORMAT,
name, serial, caps, trans->codec_preferences);
return NULL;
goto error_out;
}
if (trans->kind != GST_WEBRTC_KIND_UNKNOWN) {
@ -6414,7 +6414,7 @@ gst_webrtc_bin_request_new_pad (GstElement * element, GstPadTemplate * templ,
" existing m-line %d, but requested caps %" GST_PTR_FORMAT
" don't match transceiver kind %d",
name, serial, caps, trans->kind);
return NULL;
goto error_out;
}
}
}
@ -6486,7 +6486,6 @@ gst_webrtc_bin_request_new_pad (GstElement * element, GstPadTemplate * templ,
webrtc->priv->pending_sink_transceivers =
g_list_append (webrtc->priv->pending_sink_transceivers,
gst_object_ref (pad));
_add_pad (webrtc, pad);
if (lock_mline) {
WebRTCTransceiver *wtrans = WEBRTC_TRANSCEIVER (trans);
@ -6494,7 +6493,15 @@ gst_webrtc_bin_request_new_pad (GstElement * element, GstPadTemplate * templ,
trans->mline = serial;
}
PC_UNLOCK (webrtc);
_add_pad (webrtc, pad);
return GST_PAD (pad);
error_out:
PC_UNLOCK (webrtc);
return NULL;
}
static void