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/*
* Copyright (c) 2014 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 <limits.h>
#include <math.h>
#include "vp9/common/vp9_seg_common.h"
#include "vp9/encoder/vp9_segmentation.h"
static const double in_frame_q_adj_ratio[MAX_SEGMENTS] =
{1.0, 2.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0};
void vp9_setup_in_frame_q_adj(VP9_COMP *cpi) {
VP9_COMMON *const cm = &cpi->common;
struct segmentation *const seg = &cm->seg;
// Make SURE use of floating point in this function is safe.
vp9_clear_system_state();
if (cm->frame_type == KEY_FRAME ||
cpi->refresh_alt_ref_frame ||
(cpi->refresh_golden_frame && !cpi->rc.is_src_frame_alt_ref)) {
int segment;
// Clear down the segment map.
vpx_memset(cpi->segmentation_map, 0, cm->mi_rows * cm->mi_cols);
// Clear down the complexity map used for rd.
vpx_memset(cpi->complexity_map, 0, cm->mi_rows * cm->mi_cols);
vp9_enable_segmentation(seg);
vp9_clearall_segfeatures(seg);
// Select delta coding method.
seg->abs_delta = SEGMENT_DELTADATA;
// Segment 0 "Q" feature is disabled so it defaults to the baseline Q.
vp9_disable_segfeature(seg, 0, SEG_LVL_ALT_Q);
// Use some of the segments for in frame Q adjustment.
for (segment = 1; segment < 2; segment++) {
const int qindex_delta =
vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type, cm->base_qindex,
in_frame_q_adj_ratio[segment]);
vp9_enable_segfeature(seg, segment, SEG_LVL_ALT_Q);
vp9_set_segdata(seg, segment, SEG_LVL_ALT_Q, qindex_delta);
}
}
}
// Select a segment for the current SB64
void vp9_select_in_frame_q_segment(VP9_COMP *cpi,
int mi_row, int mi_col,
int output_enabled, int projected_rate) {
VP9_COMMON *const cm = &cpi->common;
const int mi_offset = mi_row * cm->mi_cols + mi_col;
const int bw = num_8x8_blocks_wide_lookup[BLOCK_64X64];
const int bh = num_8x8_blocks_high_lookup[BLOCK_64X64];
const int xmis = MIN(cm->mi_cols - mi_col, bw);
const int ymis = MIN(cm->mi_rows - mi_row, bh);
int complexity_metric = 64;
int x, y;
unsigned char segment;
if (!output_enabled) {
segment = 0;
} else {
// Rate depends on fraction of a SB64 in frame (xmis * ymis / bw * bh).
// It is converted to bits * 256 units.
const int target_rate = (cpi->rc.sb64_target_rate * xmis * ymis * 256) /
(bw * bh);
if (projected_rate < (target_rate / 4)) {
segment = 1;
} else {
segment = 0;
}
if (target_rate > 0) {
complexity_metric =
clamp((int)((projected_rate * 64) / target_rate), 16, 255);
}
}
// Fill in the entires in the segment map corresponding to this SB64.
for (y = 0; y < ymis; y++) {
for (x = 0; x < xmis; x++) {
cpi->segmentation_map[mi_offset + y * cm->mi_cols + x] = segment;
cpi->complexity_map[mi_offset + y * cm->mi_cols + x] =
(unsigned char)complexity_metric;
}
}
}
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