fallbackswitch: Fix pad health calculation and notifies

Change the pad health calculation to consider a pad 'healthy'
if it has received data within the last 'timeout' window. Previously,
inactive pads were constantly flip-flopping between healthy and not
healthy depending on whether they were slightly ahead of or behind
the active pad running_time.

When the health status of a pad changes, make sure to always notify
the property, so that applications that are manually controlling
the active pad can make their switching decisions.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1285>

1 files changed, 3 insertions, 2 deletions

diff --git a/utils/fallbackswitch/tests/fallbackswitch.rs b/utils/fallbackswitch/tests/fallbackswitch.rs
index 8257c73d6..564f7af6e 100644
--- a/utils/fallbackswitch/tests/fallbackswitch.rs
+++ b/utils/fallbackswitch/tests/fallbackswitch.rs
@@ -279,12 +279,13 @@ fn test_long_drop_and_recover(live: bool) {
     let buffer = pull_buffer(&pipeline);
     assert_fallback_buffer!(buffer, Some(4.seconds()));
 
-    // Produce a sixth frame from the normal source
+    // Produce a sixth frame from the normal source, which
+    // will make it healthy again
     push_buffer(&pipeline, 5.seconds());
     set_time(&pipeline, 5.seconds() + 10.mseconds());
     let buffer = pull_buffer(&pipeline);
     assert_buffer!(buffer, Some(5.seconds()));
-    assert!(!mainsink.property::<bool>("is-healthy"));
+    assert!(mainsink.property::<bool>("is-healthy"));
     drop(mainsink);
     drop(switch);