[Encode] Limit Avc DirectMode State Cmd to B frame only

I & P frame does not need  DirectMode State Cmd, so limit it to B frame only.

Change-Id: I36b04070216ee4f6efc7f6f4675dd653226e8a26

media_driver/agnostic/common/codec/hal/codechal_vdenc_avc.cpp

@@ -5793,17 +5793,20 @@ MOS_STATUS CodechalVdencAvcState::ExecutePictureLevel()
     CODECHAL_ENCODE_CHK_STATUS_RETURN(m_mfxInterface->AddMfxQmCmd(&cmdBuffer, &qmParams));
     CODECHAL_ENCODE_CHK_STATUS_RETURN(m_mfxInterface->AddMfxFqmCmd(&cmdBuffer, &fqmParams));
 
-    // Add AVC Direct Mode command
-    MHW_VDBOX_AVC_DIRECTMODE_PARAMS directmodeParams;
-    MOS_ZeroMemory(&directmodeParams, sizeof(directmodeParams));
-    directmodeParams.CurrPic = m_avcPicParam->CurrReconstructedPic;
-    directmodeParams.isEncode = true;
-    directmodeParams.uiUsedForReferenceFlags = 0xFFFFFFFF;
-    directmodeParams.pAvcPicIdx = &(m_picIdx[0]);
-    directmodeParams.avcRefList = (void**)m_refList;
-    directmodeParams.bPicIdRemappingInUse = false;
-    directmodeParams.bDisableDmvBuffers = true;
-    CODECHAL_ENCODE_CHK_STATUS_RETURN(m_mfxInterface->AddMfxAvcDirectmodeCmd(&cmdBuffer, &directmodeParams));
+    if (m_pictureCodingType == B_TYPE)
+    {
+        // Add AVC Direct Mode command
+        MHW_VDBOX_AVC_DIRECTMODE_PARAMS directmodeParams;
+        MOS_ZeroMemory(&directmodeParams, sizeof(directmodeParams));
+        directmodeParams.CurrPic = m_avcPicParam->CurrReconstructedPic;
+        directmodeParams.isEncode = true;
+        directmodeParams.uiUsedForReferenceFlags = 0xFFFFFFFF;
+        directmodeParams.pAvcPicIdx = &(m_picIdx[0]);
+        directmodeParams.avcRefList = (void**)m_refList;
+        directmodeParams.bPicIdRemappingInUse = false;
+        directmodeParams.bDisableDmvBuffers = true;
+        CODECHAL_ENCODE_CHK_STATUS_RETURN(m_mfxInterface->AddMfxAvcDirectmodeCmd(&cmdBuffer, &directmodeParams));
+    }
 
     m_osInterface->pfnReturnCommandBuffer(m_osInterface, &cmdBuffer, 0);