[mutter] screen-cast-stream: Timestamp buffers

[Marge Bot <marge-bot src gnome org>]

commit b17a510309821867c5074970304f8c7b551945a9
Author: columbarius <co1umbarius protonmail com>
Date:   Fri Jul 15 09:34:00 2022 +0200

    screen-cast-stream: Timestamp buffers
    
    With spa_meta_header we can timestamp our buffers so clients can relate
    and synchronize media from different sources.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2516>

 src/backends/meta-screen-cast-stream-src.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/src/backends/meta-screen-cast-stream-src.c b/src/backends/meta-screen-cast-stream-src.c
index 8d0e449557..5f91b66028 100644
--- a/src/backends/meta-screen-cast-stream-src.c
+++ b/src/backends/meta-screen-cast-stream-src.c
@@ -710,7 +710,10 @@ meta_screen_cast_stream_src_maybe_record_frame (MetaScreenCastStreamSrc  *src,
   priv->last_frame_timestamp_us = now_us;
 
   if (header)
-    header->flags = 0;
+    {
+      header->pts = now_us * SPA_NSEC_PER_USEC;
+      header->flags = 0;
+    }
 
   pw_stream_queue_buffer (priv->pipewire_stream, buffer);
 }