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webrtcbin: Reject creating an offer if a locked mline has no caps

Browse source 
This avoids getting in a bunch of corner cases. We'd have to insert
a "rejected" line from the start as a place-holder to get around this,
but the rest of the code just becomes more complicated, so just
disallow it for now.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2439>
This commit is contained in:
Olivier Crête 2022-05-16 18:05:25 -04:00
parent 3503599e0a
commit 0930c467d4
2 changed files with 41 additions and 2 deletions
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12
subprojects/gst-plugins-bad/ext/webrtc/gstwebrtcbin.c
View file

@ -3257,8 +3257,16 @@ sdp_media_from_transceiver (GstWebRTCBin * webrtc, GstSDPMedia * media,
}
if (!caps) {
GST_WARNING_OBJECT (webrtc, "no caps available for transceiver %"
GST_PTR_FORMAT ", skipping", trans);
if (WEBRTC_TRANSCEIVER (trans)->mline_locked) {
g_set_error (error, GST_WEBRTC_ERROR,
GST_WEBRTC_ERROR_INTERNAL_FAILURE,
"Transceiver <%s> with mid %s has locked mline %u, but no caps. "
"Can't produce offer.", GST_OBJECT_NAME (trans), trans->mid,
trans->mline);
} else {
GST_WARNING_OBJECT (webrtc, "no caps available for transceiver %"
GST_PTR_FORMAT ", skipping", trans);
}
return FALSE;
}
}

31
subprojects/gst-plugins-bad/tests/check/elements/webrtcbin.c
View file

@ -4067,6 +4067,36 @@ GST_START_TEST (test_reject_create_offer)
GST_END_TEST;
GST_START_TEST (test_reject_create_offer_mline_locked_no_caps)
{
GstHarness *h;
GstPromise *promise;
const GstStructure *s;
GstPromiseResult res;
GError *error = NULL;
h = gst_harness_new_with_padnames ("webrtcbin", "sink_0", NULL);
promise = gst_promise_new ();
g_signal_emit_by_name (h->element, "create-offer", NULL, promise);
res = gst_promise_wait (promise);
fail_unless_equals_int (res, GST_PROMISE_RESULT_REPLIED);
s = gst_promise_get_reply (promise);
fail_unless (s != NULL);
gst_structure_get (s, "error", G_TYPE_ERROR, &error, NULL);
fail_unless (g_error_matches (error, GST_WEBRTC_ERROR,
GST_WEBRTC_ERROR_INTERNAL_FAILURE));
fail_unless_equals_string (error->message,
"Transceiver <webrtctransceiver0> with mid (null) has locked mline 0,"
" but no caps. Can't produce offer.");
g_clear_error (&error);
gst_promise_unref (promise);
gst_harness_teardown (h);
}
GST_END_TEST;
GST_START_TEST (test_reject_set_description)
{
struct test_webrtc *t = test_webrtc_new ();
@ -5514,6 +5544,7 @@ webrtcbin_suite (void)
test_bundle_codec_preferences_rtx_no_duplicate_payloads);
tcase_add_test (tc, test_reject_request_pad);
tcase_add_test (tc, test_reject_create_offer);
tcase_add_test (tc, test_reject_create_offer_mline_locked_no_caps);
tcase_add_test (tc, test_reject_set_description);
tcase_add_test (tc, test_force_second_media);
tcase_add_test (tc, test_codec_preferences_caps);