Line data    Source code

       1             : /*
       2             :  *  Copyright (c) 2013 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             : #include <math.h>
      12             : 
      13             : #include "vpx_ports/mem.h"
      14             : #include "vpx_ports/system_state.h"
      15             : 
      16             : #include "vp9/encoder/vp9_aq_360.h"
      17             : #include "vp9/encoder/vp9_aq_variance.h"
      18             : 
      19             : #include "vp9/common/vp9_seg_common.h"
      20             : 
      21             : #include "vp9/encoder/vp9_ratectrl.h"
      22             : #include "vp9/encoder/vp9_rd.h"
      23             : #include "vp9/encoder/vp9_segmentation.h"
      24             : 
      25             : static const double rate_ratio[MAX_SEGMENTS] = { 1.0, 0.75, 0.6, 0.5,
      26             :                                                  0.4, 0.3,  0.25 };
      27             : 
      28             : // Sets segment id 0 for the equatorial region, 1 for temperate region
      29             : // and 2 for the polar regions
      30           0 : unsigned int vp9_360aq_segment_id(int mi_row, int mi_rows) {
      31           0 :   if (mi_row < mi_rows / 8 || mi_row > mi_rows - mi_rows / 8)
      32           0 :     return 2;
      33           0 :   else if (mi_row < mi_rows / 4 || mi_row > mi_rows - mi_rows / 4)
      34           0 :     return 1;
      35             :   else
      36           0 :     return 0;
      37             : }
      38             : 
      39           0 : void vp9_360aq_frame_setup(VP9_COMP *cpi) {
      40           0 :   VP9_COMMON *cm = &cpi->common;
      41           0 :   struct segmentation *seg = &cm->seg;
      42             :   int i;
      43             : 
      44           0 :   if (frame_is_intra_only(cm) || cpi->force_update_segmentation ||
      45           0 :       cm->error_resilient_mode) {
      46           0 :     vp9_enable_segmentation(seg);
      47           0 :     vp9_clearall_segfeatures(seg);
      48             : 
      49           0 :     seg->abs_delta = SEGMENT_DELTADATA;
      50             : 
      51           0 :     vpx_clear_system_state();
      52             : 
      53           0 :     for (i = 0; i < MAX_SEGMENTS; ++i) {
      54           0 :       int qindex_delta =
      55           0 :           vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type, cm->base_qindex,
      56             :                                      rate_ratio[i], cm->bit_depth);
      57             : 
      58             :       // We don't allow qindex 0 in a segment if the base value is not 0.
      59             :       // Q index 0 (lossless) implies 4x4 encoding only and in AQ mode a segment
      60             :       // Q delta is sometimes applied without going back around the rd loop.
      61             :       // This could lead to an illegal combination of partition size and q.
      62           0 :       if ((cm->base_qindex != 0) && ((cm->base_qindex + qindex_delta) == 0)) {
      63           0 :         qindex_delta = -cm->base_qindex + 1;
      64             :       }
      65             : 
      66             :       // No need to enable SEG_LVL_ALT_Q for this segment.
      67           0 :       if (rate_ratio[i] == 1.0) {
      68           0 :         continue;
      69             :       }
      70             : 
      71           0 :       vp9_set_segdata(seg, i, SEG_LVL_ALT_Q, qindex_delta);
      72           0 :       vp9_enable_segfeature(seg, i, SEG_LVL_ALT_Q);
      73             :     }
      74             :   }
      75           0 : }