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