videodecoder: Output mono multiview caps if none specified

Always put multiview-caps onto the output caps, assuming
mono if we've got no other information. It's still easy for
downstream elements to override using a capssetter or event
probe if desired.

https://bugzilla.gnome.org/show_bug.cgi?id=776172

diff --git a/gst-libs/gst/video/gstvideodecoder.c b/gst-libs/gst/video/gstvideodecoder.c
index b91a32e..f748587 100644 (file)
--- a/gst-libs/gst/video/gstvideodecoder.c
+++ b/gst-libs/gst/video/gstvideodecoder.c
@@ -657,6 +657,10 @@ _new_output_state (GstVideoFormat fmt, guint width, guint height,
       GST_VIDEO_INFO_MULTIVIEW_MODE (tgt) = GST_VIDEO_INFO_MULTIVIEW_MODE (ref);
       GST_VIDEO_INFO_MULTIVIEW_FLAGS (tgt) =
           GST_VIDEO_INFO_MULTIVIEW_FLAGS (ref);
+    } else {
+      /* Default to MONO, overridden as needed by sub-classes */
+      GST_VIDEO_INFO_MULTIVIEW_MODE (tgt) = GST_VIDEO_MULTIVIEW_MODE_MONO;
+      GST_VIDEO_INFO_MULTIVIEW_FLAGS (tgt) = GST_VIDEO_MULTIVIEW_FLAGS_NONE;
     }
   }
 
@@ -3786,6 +3790,16 @@ gst_video_decoder_negotiate_default (GstVideoDecoder * decoder)
   g_return_val_if_fail (GST_VIDEO_INFO_WIDTH (&state->info) != 0, FALSE);
   g_return_val_if_fail (GST_VIDEO_INFO_HEIGHT (&state->info) != 0, FALSE);
 
+  /* If the base class didn't set any multiview params, assume mono
+   * now */
+  if (GST_VIDEO_INFO_MULTIVIEW_MODE (&state->info) ==
+      GST_VIDEO_MULTIVIEW_MODE_NONE) {
+    GST_VIDEO_INFO_MULTIVIEW_MODE (&state->info) =
+        GST_VIDEO_MULTIVIEW_MODE_MONO;
+    GST_VIDEO_INFO_MULTIVIEW_FLAGS (&state->info) =
+        GST_VIDEO_MULTIVIEW_FLAGS_NONE;
+  }
+
   GST_DEBUG_OBJECT (decoder, "output_state par %d/%d fps %d/%d",
       state->info.par_n, state->info.par_d,
       state->info.fps_n, state->info.fps_d);