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/*
* Copyright (c) 2013 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <math.h>
#include "vpx_ports/mem.h"
#include "vpx_ports/system_state.h"
#include "vp9/encoder/vp9_aq_360.h"
#include "vp9/encoder/vp9_aq_variance.h"
#include "vp9/common/vp9_seg_common.h"
#include "vp9/encoder/vp9_ratectrl.h"
#include "vp9/encoder/vp9_rd.h"
#include "vp9/encoder/vp9_segmentation.h"
static const double rate_ratio[MAX_SEGMENTS] = { 1.0, 0.75, 0.6, 0.5,
0.4, 0.3, 0.25 };
// Sets segment id 0 for the equatorial region, 1 for temperate region
// and 2 for the polar regions
unsigned int vp9_360aq_segment_id(int mi_row, int mi_rows) {
if (mi_row < mi_rows / 8 || mi_row > mi_rows - mi_rows / 8)
return 2;
else if (mi_row < mi_rows / 4 || mi_row > mi_rows - mi_rows / 4)
return 1;
else
return 0;
}
void vp9_360aq_frame_setup(VP9_COMP *cpi) {
VP9_COMMON *cm = &cpi->common;
struct segmentation *seg = &cm->seg;
int i;
if (frame_is_intra_only(cm) || cpi->force_update_segmentation ||
cm->error_resilient_mode) {
vp9_enable_segmentation(seg);
vp9_clearall_segfeatures(seg);
seg->abs_delta = SEGMENT_DELTADATA;
vpx_clear_system_state();
for (i = 0; i < MAX_SEGMENTS; ++i) {
int qindex_delta =
vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type, cm->base_qindex,
rate_ratio[i], cm->bit_depth);
// We don't allow qindex 0 in a segment if the base value is not 0.
// Q index 0 (lossless) implies 4x4 encoding only and in AQ mode a segment
// Q delta is sometimes applied without going back around the rd loop.
// This could lead to an illegal combination of partition size and q.
if ((cm->base_qindex != 0) && ((cm->base_qindex + qindex_delta) == 0)) {
qindex_delta = -cm->base_qindex + 1;
}
// No need to enable SEG_LVL_ALT_Q for this segment.
if (rate_ratio[i] == 1.0) {
continue;
}
vp9_set_segdata(seg, i, SEG_LVL_ALT_Q, qindex_delta);
vp9_enable_segfeature(seg, i, SEG_LVL_ALT_Q);
}
}
}
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