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-rw-r--r--media/libvpx/vp9/encoder/vp9_aq_complexity.c163
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diff --git a/media/libvpx/vp9/encoder/vp9_aq_complexity.c b/media/libvpx/vp9/encoder/vp9_aq_complexity.c
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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/encoder/vp9_aq_complexity.h"
+#include "vp9/encoder/vp9_aq_variance.h"
+#include "vp9/encoder/vp9_encodeframe.h"
+#include "vp9/common/vp9_seg_common.h"
+#include "vp9/encoder/vp9_segmentation.h"
+
+#define AQ_C_SEGMENTS 5
+#define DEFAULT_AQ2_SEG 3 // Neutral Q segment
+#define AQ_C_STRENGTHS 3
+static const double aq_c_q_adj_factor[AQ_C_STRENGTHS][AQ_C_SEGMENTS] =
+ { {1.75, 1.25, 1.05, 1.00, 0.90},
+ {2.00, 1.50, 1.15, 1.00, 0.85},
+ {2.50, 1.75, 1.25, 1.00, 0.80} };
+static const double aq_c_transitions[AQ_C_STRENGTHS][AQ_C_SEGMENTS] =
+ { {0.15, 0.30, 0.55, 2.00, 100.0},
+ {0.20, 0.40, 0.65, 2.00, 100.0},
+ {0.25, 0.50, 0.75, 2.00, 100.0} };
+static const double aq_c_var_thresholds[AQ_C_STRENGTHS][AQ_C_SEGMENTS] =
+ { {-4.0, -3.0, -2.0, 100.00, 100.0},
+ {-3.5, -2.5, -1.5, 100.00, 100.0},
+ {-3.0, -2.0, -1.0, 100.00, 100.0} };
+
+#define DEFAULT_COMPLEXITY 64
+
+
+static int get_aq_c_strength(int q_index, vpx_bit_depth_t bit_depth) {
+ // Approximate base quatizer (truncated to int)
+ const int base_quant = vp9_ac_quant(q_index, 0, bit_depth) / 4;
+ return (base_quant > 10) + (base_quant > 25);
+}
+
+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;
+ const int aq_strength = get_aq_c_strength(cm->base_qindex, cm->bit_depth);
+
+ // Clear down the segment map.
+ memset(cpi->segmentation_map, DEFAULT_AQ2_SEG, cm->mi_rows * cm->mi_cols);
+
+ vp9_clearall_segfeatures(seg);
+
+ // Segmentation only makes sense if the target bits per SB is above a
+ // threshold. Below this the overheads will usually outweigh any benefit.
+ if (cpi->rc.sb64_target_rate < 256) {
+ vp9_disable_segmentation(seg);
+ return;
+ }
+
+ vp9_enable_segmentation(seg);
+
+ // Select delta coding method.
+ seg->abs_delta = SEGMENT_DELTADATA;
+
+ // Default segment "Q" feature is disabled so it defaults to the baseline Q.
+ vp9_disable_segfeature(seg, DEFAULT_AQ2_SEG, SEG_LVL_ALT_Q);
+
+ // Use some of the segments for in frame Q adjustment.
+ for (segment = 0; segment < AQ_C_SEGMENTS; ++segment) {
+ int qindex_delta;
+
+ if (segment == DEFAULT_AQ2_SEG)
+ continue;
+
+ qindex_delta =
+ vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type, cm->base_qindex,
+ aq_c_q_adj_factor[aq_strength][segment],
+ cm->bit_depth);
+
+
+ // For AQ complexity mode, we dont allow Q0 in a segment if the base
+ // Q is not 0. Q0 (lossless) implies 4x4 only and in AQ mode 2 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;
+ }
+ if ((cm->base_qindex + qindex_delta) > 0) {
+ vp9_enable_segfeature(seg, segment, SEG_LVL_ALT_Q);
+ vp9_set_segdata(seg, segment, SEG_LVL_ALT_Q, qindex_delta);
+ }
+ }
+ }
+}
+
+#define DEFAULT_LV_THRESH 10.0
+#define MIN_DEFAULT_LV_THRESH 8.0
+#define VAR_STRENGTH_STEP 0.25
+// Select a segment for the current block.
+// The choice of segment for a block depends on the ratio of the projected
+// bits for the block vs a target average and its spatial complexity.
+void vp9_caq_select_segment(VP9_COMP *cpi, MACROBLOCK *mb, BLOCK_SIZE bs,
+ int mi_row, int mi_col, 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, num_8x8_blocks_wide_lookup[bs]);
+ const int ymis = MIN(cm->mi_rows - mi_row, num_8x8_blocks_high_lookup[bs]);
+ int x, y;
+ int i;
+ unsigned char segment;
+
+ if (0) {
+ segment = DEFAULT_AQ2_SEG;
+ } 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);
+ double logvar;
+ double low_var_thresh;
+ const int aq_strength = get_aq_c_strength(cm->base_qindex, cm->bit_depth);
+
+ vp9_clear_system_state();
+ low_var_thresh = (cpi->oxcf.pass == 2)
+ ? MAX(cpi->twopass.mb_av_energy, MIN_DEFAULT_LV_THRESH)
+ : DEFAULT_LV_THRESH;
+
+ vp9_setup_src_planes(mb, cpi->Source, mi_row, mi_col);
+ logvar = vp9_log_block_var(cpi, mb, bs);
+
+ segment = AQ_C_SEGMENTS - 1; // Just in case no break out below.
+ for (i = 0; i < AQ_C_SEGMENTS; ++i) {
+ // Test rate against a threshold value and variance against a threshold.
+ // Increasing segment number (higher variance and complexity) = higher Q.
+ if ((projected_rate <
+ target_rate * aq_c_transitions[aq_strength][i]) &&
+ (logvar < (low_var_thresh + aq_c_var_thresholds[aq_strength][i]))) {
+ segment = i;
+ break;
+ }
+ }
+ }
+
+ // 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;
+ }
+ }
+}