codecparsers: h264: fix derivation of MaxPicNum variable.

The logic to compute the MaxPicNum variable was reversed. In paricular,
MaxPicNum is double MaxFrameNum only if field_pic_flag is set to 1.

https://bugzilla.gnome.org/show_bug.cgi?id=739291

diff --git a/gst-libs/gst/codecparsers/gsth264parser.c b/gst-libs/gst/codecparsers/gsth264parser.c
index 6b1f35a45242ea2cef6d950575af0826ad918057..4df2bad0d2c58e44d0ca06c35503ad04e3d8ecac 100644 (file)
--- a/gst-libs/gst/codecparsers/gsth264parser.c
+++ b/gst-libs/gst/codecparsers/gsth264parser.c
@@ -2176,9 +2176,9 @@ gst_h264_parser_parse_slice_hdr (GstH264NalParser * nalparser,
 
   /* calculate MaxPicNum */
   if (slice->field_pic_flag)
-    slice->max_pic_num = sps->max_frame_num;
-  else
     slice->max_pic_num = 2 * sps->max_frame_num;
+  else
+    slice->max_pic_num = sps->max_frame_num;
 
   if (nalu->idr_pic_flag)
     READ_UE_ALLOWED (&nr, slice->idr_pic_id, 0, G_MAXUINT16);