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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         vpx_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 flag if it is currently set
41                 if ((this_mb_mode_info->mbmi.ref_frame == GOLDEN_FRAME) || (this_mb_mode_info->mbmi.ref_frame == ALTREF_FRAME))
42                 {
43                     if (*(x->gf_active_ptr) == 0)
44                     {
45                         *(x->gf_active_ptr) = 1;
46                         cpi->gf_active_count ++;
47                     }
48                 }
49                 else if ((this_mb_mode_info->mbmi.mode != ZEROMV) && *(x->gf_active_ptr))
50                 {
51                     *(x->gf_active_ptr) = 0;
52                     cpi->gf_active_count--;
53                 }
54 
55                 x->gf_active_ptr++;          // Step onto next entry
56                 this_mb_mode_info++;           // skip to next mb
57 
58             }
59 
60             // this is to account for the border
61             this_mb_mode_info++;
62         }
63     }
64 }
65