1 files changed, 175 insertions, 0 deletions
diff --git a/third_party/aom/av1/encoder/aq_complexity.c b/third_party/aom/av1/encoder/aq_complexity.c
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+++ b/third_party/aom/av1/encoder/aq_complexity.c
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+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#include <limits.h>
+#include <math.h>
+
+#include "av1/encoder/aq_complexity.h"
+#include "av1/encoder/aq_variance.h"
+#include "av1/encoder/encodeframe.h"
+#include "av1/common/seg_common.h"
+#include "av1/encoder/segmentation.h"
+#include "aom_dsp/aom_dsp_common.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 }
+};
+
+static int get_aq_c_strength(int q_index, aom_bit_depth_t bit_depth) {
+  // Approximate base quatizer (truncated to int)
+  const int base_quant = av1_ac_quant_QTX(q_index, 0, bit_depth) / 4;
+  return (base_quant > 10) + (base_quant > 25);
+}
+
+static bool is_frame_aq_enabled(const AV1_COMP *const cpi) {
+  const AV1_COMMON *const cm = &cpi->common;
+  const RefreshFrameInfo *const refresh_frame = &cpi->refresh_frame;
+
+  return frame_is_intra_only(cm) || cm->features.error_resilient_mode ||
+         refresh_frame->alt_ref_frame ||
+         (refresh_frame->golden_frame && !cpi->rc.is_src_frame_alt_ref);
+}
+
+// Segmentation only makes sense if the target bits per SB is above a threshold.
+// Below this the overheads will usually outweigh any benefit.
+static bool is_sb_aq_enabled(const AV1_COMP *const cpi) {
+  return cpi->rc.sb64_target_rate >= 256;
+}
+
+void av1_setup_in_frame_q_adj(AV1_COMP *cpi) {
+  AV1_COMMON *const cm = &cpi->common;
+  const int base_qindex = cm->quant_params.base_qindex;
+  struct segmentation *const seg = &cm->seg;
+  const int resolution_change =
+      cm->prev_frame && (cm->width != cm->prev_frame->width ||
+                         cm->height != cm->prev_frame->height);
+
+  // Make SURE use of floating point in this function is safe.
+
+  if (resolution_change) {
+    memset(cpi->enc_seg.map, 0, cm->mi_params.mi_rows * cm->mi_params.mi_cols);
+    av1_clearall_segfeatures(seg);
+    av1_disable_segmentation(seg);
+    return;
+  }
+
+  if (is_frame_aq_enabled(cpi)) {
+    int segment;
+    const int aq_strength =
+        get_aq_c_strength(base_qindex, cm->seq_params->bit_depth);
+
+    // Clear down the segment map.
+    memset(cpi->enc_seg.map, DEFAULT_AQ2_SEG,
+           cm->mi_params.mi_rows * cm->mi_params.mi_cols);
+
+    av1_clearall_segfeatures(seg);
+
+    if (!is_sb_aq_enabled(cpi)) {
+      av1_disable_segmentation(seg);
+      return;
+    }
+
+    av1_enable_segmentation(seg);
+
+    // Default segment "Q" feature is disabled so it defaults to the baseline Q.
+    av1_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 = av1_compute_qdelta_by_rate(
+          cpi, cm->current_frame.frame_type, base_qindex,
+          aq_c_q_adj_factor[aq_strength][segment]);
+
+      // 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 ((base_qindex != 0) && ((base_qindex + qindex_delta) == 0)) {
+        qindex_delta = -base_qindex + 1;
+      }
+      if ((base_qindex + qindex_delta) > 0) {
+        av1_enable_segfeature(seg, segment, SEG_LVL_ALT_Q);
+        av1_set_segdata(seg, segment, SEG_LVL_ALT_Q, qindex_delta);
+      }
+    }
+  }
+}
+
+#define DEFAULT_LV_THRESH 10.0
+#define MIN_DEFAULT_LV_THRESH 8.0
+// 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 av1_caq_select_segment(const AV1_COMP *cpi, MACROBLOCK *mb, BLOCK_SIZE bs,
+                            int mi_row, int mi_col, int projected_rate) {
+  if ((!is_frame_aq_enabled(cpi)) || (!is_sb_aq_enabled(cpi))) return;
+  const AV1_COMMON *const cm = &cpi->common;
+  const int num_planes = av1_num_planes(cm);
+
+  const int mi_offset = mi_row * cm->mi_params.mi_cols + mi_col;
+  const int xmis = AOMMIN(cm->mi_params.mi_cols - mi_col, mi_size_wide[bs]);
+  const int ymis = AOMMIN(cm->mi_params.mi_rows - mi_row, mi_size_high[bs]);
+  int i;
+  unsigned char segment;
+
+  // Rate depends on fraction of a SB64 in frame (xmis * ymis / bw * bh).
+  // It is converted to bits << AV1_PROB_COST_SHIFT units.
+  const int64_t num = (int64_t)(cpi->rc.sb64_target_rate * xmis * ymis)
+                      << AV1_PROB_COST_SHIFT;
+  const int denom = cm->seq_params->mib_size * cm->seq_params->mib_size;
+  const int target_rate = (int)(num / denom);
+  double logvar;
+  double low_var_thresh;
+  const int aq_strength = get_aq_c_strength(cm->quant_params.base_qindex,
+                                            cm->seq_params->bit_depth);
+
+  low_var_thresh =
+      (is_stat_consumption_stage_twopass(cpi))
+          ? AOMMAX(exp(cpi->twopass_frame.mb_av_energy), MIN_DEFAULT_LV_THRESH)
+          : DEFAULT_LV_THRESH;
+
+  av1_setup_src_planes(mb, cpi->source, mi_row, mi_col, num_planes, bs);
+  logvar = av1_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.
+  const int mi_stride = cm->mi_params.mi_cols;
+  set_segment_id(cpi->enc_seg.map, mi_offset, xmis, ymis, mi_stride, segment);
+}