decoder: H265: Enable cu_qp_delta_enabled_flag when ROI

If ROI is enabled, the CUs within the ROI region may have different
QP from the other part of the picture. This needs us to enable the
cu_qp_delta_enabled_flag even in the CQP mode.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-vaapi/-/merge_requests/419>

gst-libs/gst/vaapi/gstvaapiencoder.c

@@ -193,6 +193,8 @@ gst_vaapi_encoder_ensure_param_roi_regions (GstVaapiEncoder * encoder,
         g_quark_to_string (roi->roi_type), roi->id, roi->x, roi->y, roi->w,
         roi->h);
 
+    picture->has_roi = TRUE;
+
     region_roi[i].roi_rectangle.x = roi->x;
     region_roi[i].roi_rectangle.y = roi->y;
     region_roi[i].roi_rectangle.width = roi->w;
@@ -214,7 +216,9 @@ gst_vaapi_encoder_ensure_param_roi_regions (GstVaapiEncoder * encoder,
     }
   }
 
-  gst_vaapi_enc_picture_add_misc_param (picture, misc);
+  if (picture->has_roi)
+    gst_vaapi_enc_picture_add_misc_param (picture, misc);
+
   gst_vaapi_codec_object_replace (&misc, NULL);
 #endif
   return TRUE;

gst-libs/gst/vaapi/gstvaapiencoder_h265.c

@@ -2033,6 +2033,7 @@ fill_picture (GstVaapiEncoderH265 * encoder, GstVaapiEncPicture * picture,
   /* it seems driver requires enablement of cu_qp_delta_enabled_flag
    * to modifiy QP values in CBR mode or low power encoding */
   if (GST_VAAPI_ENCODER_RATE_CONTROL (encoder) != GST_VAAPI_RATECONTROL_CQP
+      || picture->has_roi
       || encoder->entrypoint == GST_VAAPI_ENTRYPOINT_SLICE_ENCODE_LP)
     pic_param->pic_fields.bits.cu_qp_delta_enabled_flag = 1;
 

gst-libs/gst/vaapi/gstvaapiencoder_objects.h

@@ -266,6 +266,7 @@ struct _GstVaapiEncPicture
   guint frame_num;
   guint poc;
   guint temporal_id;
+  gboolean has_roi;
 };
 
 G_GNUC_INTERNAL