1 files changed, 63 insertions, 0 deletions
diff --git a/vp8/common/segmentation_common.c b/vp8/common/segmentation_common.c
new file mode 100644
index 000000000..72b8c874b
--- /dev/null
+++ b/vp8/common/segmentation_common.c
@@ -0,0 +1,63 @@
+/*
+ *  Copyright (c) 2010 The VP8 project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license and patent
+ *  grant that can be found in the LICENSE file in the root of the source
+ *  tree. All contributing project authors may be found in the AUTHORS
+ *  file in the root of the source tree.
+ */
+
+
+#include "segmentation_common.h"
+#include "vpx_mem/vpx_mem.h"
+
+void vp8_update_gf_useage_maps(VP8_COMMON *cm, MACROBLOCKD *xd)
+{
+    int mb_row, mb_col;
+
+    MODE_INFO *this_mb_mode_info = cm->mi;
+
+    xd->gf_active_ptr = (signed char *)cm->gf_active_flags;
+
+    if ((cm->frame_type == KEY_FRAME) || (cm->refresh_golden_frame))
+    {
+        // Reset Gf useage monitors
+        vpx_memset(cm->gf_active_flags, 1, (cm->mb_rows * cm->mb_cols));
+        cm->gf_active_count = cm->mb_rows * cm->mb_cols;
+    }
+    else
+    {
+        // for each macroblock row in image
+        for (mb_row = 0; mb_row < cm->mb_rows; mb_row++)
+        {
+            // for each macroblock col in image
+            for (mb_col = 0; mb_col < cm->mb_cols; mb_col++)
+            {
+
+                // If using golden then set GF active flag if not already set.
+                // If using last frame 0,0 mode then leave flag as it is
+                // else if using non 0,0 motion or intra modes then clear flag if it is currently set
+                if ((this_mb_mode_info->mbmi.ref_frame == GOLDEN_FRAME) || (this_mb_mode_info->mbmi.ref_frame == ALTREF_FRAME))
+                {
+                    if (*(xd->gf_active_ptr) == 0)
+                    {
+                        *(xd->gf_active_ptr) = 1;
+                        cm->gf_active_count ++;
+                    }
+                }
+                else if ((this_mb_mode_info->mbmi.mode != ZEROMV) && *(xd->gf_active_ptr))
+                {
+                    *(xd->gf_active_ptr) = 0;
+                    cm->gf_active_count--;
+                }
+
+                xd->gf_active_ptr++;          // Step onto next entry
+                this_mb_mode_info++;           // skip to next mb
+
+            }
+
+            // this is to account for the border
+            this_mb_mode_info++;
+        }
+    }
+}