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webrtcbin: Ensure that query caps method returns valid caps

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This means rejecting any caps that aren't fixed. Also, use a filter
that will create unfixed caps if the other side just returns ANY.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2104>
This commit is contained in:
Olivier Crête 2021-03-31 11:40:28 -04:00
parent 09c65fe534
commit c7107fd940
1 changed files with 25 additions and 3 deletions
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24
ext/webrtc/gstwebrtcbin.c
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@ -1511,9 +1511,28 @@ _find_codec_preferences (GstWebRTCBin * webrtc,
GST_LOG_OBJECT (webrtc, "Using current pad caps: %" GST_PTR_FORMAT,
caps);
} else {
if ((caps = gst_pad_peer_query_caps (GST_PAD (pad), NULL)))
static GstStaticCaps static_filter =
GST_STATIC_CAPS ("application/x-rtp, "
"media = (string) { audio, video }, payload = (int) [ 0, 127 ]");
GstCaps *filter = gst_static_caps_get (&static_filter);
filter = gst_caps_make_writable (filter);
if (rtp_trans->kind == GST_WEBRTC_KIND_AUDIO)
gst_caps_set_simple (filter, "media", G_TYPE_STRING, "audio", NULL);
else if (rtp_trans->kind == GST_WEBRTC_KIND_VIDEO)
gst_caps_set_simple (filter, "media", G_TYPE_STRING, "video", NULL);
caps = gst_pad_peer_query_caps (GST_PAD (pad), filter);
GST_LOG_OBJECT (webrtc, "Using peer query caps: %" GST_PTR_FORMAT,
caps);
if (!gst_caps_is_fixed (caps) || gst_caps_is_equal_fixed (caps, filter)
|| gst_caps_is_empty (caps) || gst_caps_is_any (caps)) {
gst_caps_unref (caps);
caps = NULL;
}
gst_caps_unref (filter);
}
if (caps) {
if (trans)
@ -1539,6 +1558,9 @@ _add_supported_attributes_to_caps (GstWebRTCBin * webrtc,
GstCaps *ret;
guint i;
if (caps == NULL)
return NULL;
ret = gst_caps_make_writable (caps);
for (i = 0; i < gst_caps_get_size (ret); i++) {