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find_codec_preferences: use received caps

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When negotiation is triggered by receiving caps on our sink pad
probes, we could encounter a race condition where need-negotiation
is emitted and the application requires the creation of an offer
before the current caps were actually updated.

This led to retrieving incomplete caps when creating the offer,
using find_codec_preferences -> pad_get_current_caps.

Instead, as we save the caps in the probe callback anyway, it is better
and thread safe to use these if they were set.

https://bugzilla.gnome.org/show_bug.cgi?id=796801
This commit is contained in:
Mathieu Duponchelle 2018-07-07 03:40:49 +02:00
parent e47cf9abe1
commit 6fd3e2a400
1 changed files with 5 additions and 2 deletions
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7
ext/webrtc/gstwebrtcbin.c
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@ -1259,8 +1259,11 @@ _find_codec_preferences (GstWebRTCBin * webrtc, GstWebRTCRTPTransceiver * trans,
} else {
GstWebRTCBinPad *pad = _find_pad_for_mline (webrtc, direction, media_idx);
if (pad) {
GstCaps *caps = gst_pad_get_current_caps (GST_PAD (pad));
if (caps) {
GstCaps *caps = NULL;
if (pad->received_caps) {
caps = gst_caps_ref (pad->received_caps);
} else if ((caps = gst_pad_get_current_caps (GST_PAD (pad)))) {
GST_LOG_OBJECT (webrtc, "Using current pad caps: %" GST_PTR_FORMAT,
caps);
} else {