1 /*
2  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 
12 #include "segmentation.h"
13 #include "vpx_mem/vpx_mem.h"
14 
vp8_update_gf_useage_maps(VP8_COMP * cpi,VP8_COMMON * cm,MACROBLOCK * x)15 void vp8_update_gf_useage_maps(VP8_COMP *cpi, VP8_COMMON *cm, MACROBLOCK *x)
16 {
17     int mb_row, mb_col;
18 
19     MODE_INFO *this_mb_mode_info = cm->mi;
20 
21     x->gf_active_ptr = (signed char *)cpi->gf_active_flags;
22 
23     if ((cm->frame_type == KEY_FRAME) || (cm->refresh_golden_frame))
24     {
25         /* Reset Gf useage monitors */
26         memset(cpi->gf_active_flags, 1, (cm->mb_rows * cm->mb_cols));
27         cpi->gf_active_count = cm->mb_rows * cm->mb_cols;
28     }
29     else
30     {
31         /* for each macroblock row in image */
32         for (mb_row = 0; mb_row < cm->mb_rows; mb_row++)
33         {
34             /* for each macroblock col in image */
35             for (mb_col = 0; mb_col < cm->mb_cols; mb_col++)
36             {
37 
38                 /* If using golden then set GF active flag if not already set.
39                  * If using last frame 0,0 mode then leave flag as it is
40                  * else if using non 0,0 motion or intra modes then clear
41                  * flag if it is currently set
42                  */
43                 if ((this_mb_mode_info->mbmi.ref_frame == GOLDEN_FRAME) || (this_mb_mode_info->mbmi.ref_frame == ALTREF_FRAME))
44                 {
45                     if (*(x->gf_active_ptr) == 0)
46                     {
47                         *(x->gf_active_ptr) = 1;
48                         cpi->gf_active_count ++;
49                     }
50                 }
51                 else if ((this_mb_mode_info->mbmi.mode != ZEROMV) && *(x->gf_active_ptr))
52                 {
53                     *(x->gf_active_ptr) = 0;
54                     cpi->gf_active_count--;
55                 }
56 
57                 x->gf_active_ptr++;          /* Step onto next entry */
58                 this_mb_mode_info++;         /* skip to next mb */
59 
60             }
61 
62             /* this is to account for the border */
63             this_mb_mode_info++;
64         }
65     }
66 }
67