From ae1455e4d6e429e9a443a03f9a2777031ee58d78 Mon Sep 17 00:00:00 2001
From: Josh Matthews <josh@joshmatthews.net>
Date: Thu, 7 Feb 2019 10:02:00 -0500
Subject: [PATCH] Return 0 for the mask of any negative GstAudioChannelPosition
 value.

---
 gstreamer-audio/src/audio_channel_position.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/gstreamer-audio/src/audio_channel_position.rs b/gstreamer-audio/src/audio_channel_position.rs
index ef3c54684..8fdd0d36d 100644
--- a/gstreamer-audio/src/audio_channel_position.rs
+++ b/gstreamer-audio/src/audio_channel_position.rs
@@ -20,8 +20,12 @@ use array_init;
 
 impl AudioChannelPosition {
     pub fn to_mask(self) -> u64 {
+        let pos = self.to_glib();
+        if pos < 0 {
+            return 0;
+        }
         unsafe {
-            let val = mem::transmute::<ffi::GstAudioChannelPosition, u32>(self.to_glib());
+            let val = mem::transmute::<ffi::GstAudioChannelPosition, u32>(pos);
             1 << val
         }
     }