From 8e038572cb727fdce62fac34b404951ba004cb31 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebastian@centricular.com>
Date: Mon, 9 Mar 2020 13:02:20 +0200
Subject: [PATCH] gstreamer/caps: Assert on ANY caps in fixate() and work
 around bug in handling EMPTY caps

See https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/388
---
 gstreamer/src/caps.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/gstreamer/src/caps.rs b/gstreamer/src/caps.rs
index 69e146c23..368a94e62 100644
--- a/gstreamer/src/caps.rs
+++ b/gstreamer/src/caps.rs
@@ -73,7 +73,13 @@ impl Caps {
     pub fn fixate(&mut self) {
         skip_assert_initialized!();
         unsafe {
-            let ptr = gst_sys::gst_caps_fixate(self.as_mut_ptr());
+            // See https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/388
+            assert!(!self.is_any());
+            let ptr = if self.is_empty() {
+                gst_sys::gst_caps_new_empty()
+            } else {
+                gst_sys::gst_caps_fixate(self.as_mut_ptr())
+            };
             self.replace_ptr(ptr);
         }
     }