codecparsers: vc1: fix calculation of ALTPQUANT.

Fix calculation of ALTPQUANT when DQUANT == 1. PQDIFF alters ALTPQUANT
in any case. See 7.1.1.31.6.

https://bugzilla.gnome.org/show_bug.cgi?id=692270

Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com>

diff --git a/gst-libs/gst/codecparsers/gstvc1parser.c b/gst-libs/gst/codecparsers/gstvc1parser.c
index 557cc06fb34f43ccc9db668ac3f0ebac71e89326..225a7c0ee14599f26ff7be3a987b62449e060347 100644 (file)
--- a/gst-libs/gst/codecparsers/gstvc1parser.c
+++ b/gst-libs/gst/codecparsers/gstvc1parser.c
@@ -659,8 +659,12 @@ parse_vopdquant (GstBitReader * br, GstVC1FrameHdr * framehdr, guint8 dquant)
         {
           READ_UINT8 (br, vopdquant->pqdiff, 3);
 
-          if (vopdquant->pqdiff == 7)
+          if (vopdquant->pqdiff != 7)
+            vopdquant->altpquant = framehdr->pquant + vopdquant->pqdiff + 1;
+          else {
             READ_UINT8 (br, vopdquant->abspq, 5);
+            vopdquant->altpquant = vopdquant->abspq;
+          }
         }
       }
     }