[Encode] Add AV1 SCC Palette tuning for Xe3 LPM

* [Encode] Add AV1 SCC Palette tuning for Xe3 LPM
Added performance tuning for AV1 Screen Content Coding (SCC) when Palette mode is enabled and IBC is disabled for target usage levels 6 and 7 on Xe3 LPM platform. Configures vdencCmd2Par settings to optimize intra prediction candidate counts for different CU sizes (8x8, 16x16, 32x32) and chroma channels. Key frames receive more aggressive tuning with additional intra mode checks compared to non-key frames. Settings applied through both parameter structure and direct bit manipulation for hardware command configuration.

Author: Bossonor

media_softlet/agnostic/Xe3_M_plus/Xe3_LPM_base/codec/hal/enc/av1/features/encode_av1_scc_xe3_lpm_base.cpp

@@ -63,6 +63,32 @@ namespace encode
             params.vdencCmd2Par100 = 0;
         }
 
+        // Palette ON + IBC OFF tuning for TU6/TU7 using vdencCmd2Par settings
+        if (m_enablePalette && !m_enableIBC && (m_basicFeature->m_targetUsage == 6 || m_basicFeature->m_targetUsage == 7))
+        {
+            const auto frame_type = static_cast<Av1FrameType>(m_basicFeature->m_av1PicParams->PicFlags.fields.frame_type);
+            
+            if (AV1_KEY_OR_INRA_FRAME(frame_type))
+            {
+                // Key frame vdencCmd2Par settings
+                params.vdencCmd2Par149 = 3;
+                params.vdencCmd2Par138 = 3;
+                params.vdencCmd2Par150 = 3;
+                params.vdencCmd2Par153 = 4;
+                params.vdencCmd2Par139 = 3;
+                params.vdencCmd2Par147 = 1;
+            }
+            else
+            {
+                // Non-key frame vdencCmd2Par settings
+                params.vdencCmd2Par153 = 0;
+            }
+            
+            // All frames vdencCmd2Par settings
+            params.vdencCmd2Par146 = 1;
+            params.vdencCmd2Par100 = 3;
+        }
+
         if (m_IBCEnabledForCurrentTile)
         {
             if ((m_basicFeature->m_targetUsage == 2 || m_basicFeature->m_targetUsage == 1) && (params.vdencCmd2Par135[1] == vdencCmd2Par135Value1))
@@ -88,7 +114,29 @@ namespace encode
 
             if ((m_basicFeature->m_targetUsage == 7 || m_basicFeature->m_targetUsage == 6) && (m_enablePalette || m_enableIBC))
             {
-                data[54] &= 0xfffffff1;
+                data[54] &= 0xffffffE3;
+            }
+
+            // Palette ON + IBC OFF tuning for TU6/TU7 using data array bit manipulation
+            if (m_enablePalette && !m_enableIBC && (m_basicFeature->m_targetUsage == 6 || m_basicFeature->m_targetUsage == 7))
+            {
+                const auto frame_type = static_cast<Av1FrameType>(m_basicFeature->m_av1PicParams->PicFlags.fields.frame_type);
+                
+                if (AV1_KEY_OR_INRA_FRAME(frame_type))
+                {
+                    // Key frame vdencCmd2Par settings in DW62 and DW63
+                    data[62] = (data[62] & 0xF00F000F) | 0x03403330;
+                    data[63] = (data[63] & 0xF3FFFFFF) | 0x04000000;
+                }
+                else
+                {
+                    // Non-key frame vdencCmd2Par settings in DW62
+                    data[62] = (data[62] & 0xFF0FFFFF);
+                }
+                
+                // All frames vdencCmd2Par settings in DW63 and DW54
+                data[63] = (data[63] & 0xCFFFFFFF) | 0x10000000;
+                data[54] = (data[54] & 0xFFFFFFE3) | 0xC;
             }
 
             if (m_IBCEnabledForCurrentTile)