Merge branch 'master' into Sync-weave

1 files changed, 244 insertions, 0 deletions

diff --git a/third_party/aom/av1/encoder/segmentation.c b/third_party/aom/av1/encoder/segmentation.c
new file mode 100644
index 000000000..2e9102745
--- /dev/null
+++ b/third_party/aom/av1/encoder/segmentation.c
@@ -0,0 +1,244 @@
+/*
+ * 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 "aom_mem/aom_mem.h"
+
+#include "av1/common/pred_common.h"
+#include "av1/common/tile_common.h"
+
+#include "av1/encoder/cost.h"
+#include "av1/encoder/segmentation.h"
+
+void av1_enable_segmentation(struct segmentation *seg) {
+  seg->enabled = 1;
+  seg->update_map = 1;
+  seg->update_data = 1;
+  seg->temporal_update = 0;
+}
+
+void av1_disable_segmentation(struct segmentation *seg) {
+  seg->enabled = 0;
+  seg->update_map = 0;
+  seg->update_data = 0;
+  seg->temporal_update = 0;
+}
+
+void av1_disable_segfeature(struct segmentation *seg, int segment_id,
+                            SEG_LVL_FEATURES feature_id) {
+  seg->feature_mask[segment_id] &= ~(1 << feature_id);
+}
+
+void av1_clear_segdata(struct segmentation *seg, int segment_id,
+                       SEG_LVL_FEATURES feature_id) {
+  seg->feature_data[segment_id][feature_id] = 0;
+}
+
+static void count_segs(const AV1_COMMON *cm, MACROBLOCKD *xd,
+                       const TileInfo *tile, MB_MODE_INFO **mi,
+                       unsigned *no_pred_segcounts,
+                       unsigned (*temporal_predictor_count)[2],
+                       unsigned *t_unpred_seg_counts, int bw, int bh,
+                       int mi_row, int mi_col) {
+  int segment_id;
+
+  if (mi_row >= cm->mi_rows || mi_col >= cm->mi_cols) return;
+
+  xd->mi = mi;
+  segment_id = xd->mi[0]->segment_id;
+
+  set_mi_row_col(xd, tile, mi_row, bh, mi_col, bw, cm->mi_rows, cm->mi_cols);
+
+  // Count the number of hits on each segment with no prediction
+  no_pred_segcounts[segment_id]++;
+
+  // Temporal prediction not allowed on key frames
+  if (cm->frame_type != KEY_FRAME) {
+    const BLOCK_SIZE bsize = xd->mi[0]->sb_type;
+    // Test to see if the segment id matches the predicted value.
+    const int pred_segment_id =
+        cm->last_frame_seg_map
+            ? get_segment_id(cm, cm->last_frame_seg_map, bsize, mi_row, mi_col)
+            : 0;
+    const int pred_flag = pred_segment_id == segment_id;
+    const int pred_context = av1_get_pred_context_seg_id(xd);
+
+    // Store the prediction status for this mb and update counts
+    // as appropriate
+    xd->mi[0]->seg_id_predicted = pred_flag;
+    temporal_predictor_count[pred_context][pred_flag]++;
+
+    // Update the "unpredicted" segment count
+    if (!pred_flag) t_unpred_seg_counts[segment_id]++;
+  }
+}
+
+static void count_segs_sb(const AV1_COMMON *cm, MACROBLOCKD *xd,
+                          const TileInfo *tile, MB_MODE_INFO **mi,
+                          unsigned *no_pred_segcounts,
+                          unsigned (*temporal_predictor_count)[2],
+                          unsigned *t_unpred_seg_counts, int mi_row, int mi_col,
+                          BLOCK_SIZE bsize) {
+  const int mis = cm->mi_stride;
+  const int bs = mi_size_wide[bsize], hbs = bs / 2;
+  PARTITION_TYPE partition;
+  const int qbs = bs / 4;
+
+  if (mi_row >= cm->mi_rows || mi_col >= cm->mi_cols) return;
+
+#define CSEGS(cs_bw, cs_bh, cs_rowoff, cs_coloff)                              \
+  count_segs(cm, xd, tile, mi + mis * (cs_rowoff) + (cs_coloff),               \
+             no_pred_segcounts, temporal_predictor_count, t_unpred_seg_counts, \
+             (cs_bw), (cs_bh), mi_row + (cs_rowoff), mi_col + (cs_coloff));
+
+  if (bsize == BLOCK_8X8)
+    partition = PARTITION_NONE;
+  else
+    partition = get_partition(cm, mi_row, mi_col, bsize);
+  switch (partition) {
+    case PARTITION_NONE: CSEGS(bs, bs, 0, 0); break;
+    case PARTITION_HORZ:
+      CSEGS(bs, hbs, 0, 0);
+      CSEGS(bs, hbs, hbs, 0);
+      break;
+    case PARTITION_VERT:
+      CSEGS(hbs, bs, 0, 0);
+      CSEGS(hbs, bs, 0, hbs);
+      break;
+    case PARTITION_HORZ_A:
+      CSEGS(hbs, hbs, 0, 0);
+      CSEGS(hbs, hbs, 0, hbs);
+      CSEGS(bs, hbs, hbs, 0);
+      break;
+    case PARTITION_HORZ_B:
+      CSEGS(bs, hbs, 0, 0);
+      CSEGS(hbs, hbs, hbs, 0);
+      CSEGS(hbs, hbs, hbs, hbs);
+      break;
+    case PARTITION_VERT_A:
+      CSEGS(hbs, hbs, 0, 0);
+      CSEGS(hbs, hbs, hbs, 0);
+      CSEGS(hbs, bs, 0, hbs);
+      break;
+    case PARTITION_VERT_B:
+      CSEGS(hbs, bs, 0, 0);
+      CSEGS(hbs, hbs, 0, hbs);
+      CSEGS(hbs, hbs, hbs, hbs);
+      break;
+    case PARTITION_HORZ_4:
+      CSEGS(bs, qbs, 0, 0);
+      CSEGS(bs, qbs, qbs, 0);
+      CSEGS(bs, qbs, 2 * qbs, 0);
+      if (mi_row + 3 * qbs < cm->mi_rows) CSEGS(bs, qbs, 3 * qbs, 0);
+      break;
+
+    case PARTITION_VERT_4:
+      CSEGS(qbs, bs, 0, 0);
+      CSEGS(qbs, bs, 0, qbs);
+      CSEGS(qbs, bs, 0, 2 * qbs);
+      if (mi_col + 3 * qbs < cm->mi_cols) CSEGS(qbs, bs, 0, 3 * qbs);
+      break;
+
+    case PARTITION_SPLIT: {
+      const BLOCK_SIZE subsize = get_partition_subsize(bsize, PARTITION_SPLIT);
+      int n;
+
+      for (n = 0; n < 4; n++) {
+        const int mi_dc = hbs * (n & 1);
+        const int mi_dr = hbs * (n >> 1);
+
+        count_segs_sb(cm, xd, tile, &mi[mi_dr * mis + mi_dc], no_pred_segcounts,
+                      temporal_predictor_count, t_unpred_seg_counts,
+                      mi_row + mi_dr, mi_col + mi_dc, subsize);
+      }
+    } break;
+    default: assert(0);
+  }
+
+#undef CSEGS
+}
+
+void av1_choose_segmap_coding_method(AV1_COMMON *cm, MACROBLOCKD *xd) {
+  struct segmentation *seg = &cm->seg;
+  struct segmentation_probs *segp = &cm->fc->seg;
+  int no_pred_cost;
+  int t_pred_cost = INT_MAX;
+  int tile_col, tile_row, mi_row, mi_col;
+  unsigned temporal_predictor_count[SEG_TEMPORAL_PRED_CTXS][2] = { { 0 } };
+  unsigned no_pred_segcounts[MAX_SEGMENTS] = { 0 };
+  unsigned t_unpred_seg_counts[MAX_SEGMENTS] = { 0 };
+  (void)xd;
+
+  // First of all generate stats regarding how well the last segment map
+  // predicts this one
+  for (tile_row = 0; tile_row < cm->tile_rows; tile_row++) {
+    TileInfo tile_info;
+    av1_tile_set_row(&tile_info, cm, tile_row);
+    for (tile_col = 0; tile_col < cm->tile_cols; tile_col++) {
+      MB_MODE_INFO **mi_ptr;
+      av1_tile_set_col(&tile_info, cm, tile_col);
+      mi_ptr = cm->mi_grid_visible + tile_info.mi_row_start * cm->mi_stride +
+               tile_info.mi_col_start;
+      for (mi_row = tile_info.mi_row_start; mi_row < tile_info.mi_row_end;
+           mi_row += cm->seq_params.mib_size,
+          mi_ptr += cm->seq_params.mib_size * cm->mi_stride) {
+        MB_MODE_INFO **mi = mi_ptr;
+        for (mi_col = tile_info.mi_col_start; mi_col < tile_info.mi_col_end;
+             mi_col += cm->seq_params.mib_size, mi += cm->seq_params.mib_size) {
+          count_segs_sb(cm, xd, &tile_info, mi, no_pred_segcounts,
+                        temporal_predictor_count, t_unpred_seg_counts, mi_row,
+                        mi_col, cm->seq_params.sb_size);
+        }
+      }
+    }
+  }
+
+  int seg_id_cost[MAX_SEGMENTS];
+  av1_cost_tokens_from_cdf(seg_id_cost, segp->tree_cdf, NULL);
+  no_pred_cost = 0;
+  for (int i = 0; i < MAX_SEGMENTS; ++i)
+    no_pred_cost += no_pred_segcounts[i] * seg_id_cost[i];
+
+  // Frames without past dependency cannot use temporal prediction
+  if (cm->primary_ref_frame != PRIMARY_REF_NONE) {
+    int pred_flag_cost[SEG_TEMPORAL_PRED_CTXS][2];
+    for (int i = 0; i < SEG_TEMPORAL_PRED_CTXS; ++i)
+      av1_cost_tokens_from_cdf(pred_flag_cost[i], segp->pred_cdf[i], NULL);
+    t_pred_cost = 0;
+    // Cost for signaling the prediction flag.
+    for (int i = 0; i < SEG_TEMPORAL_PRED_CTXS; ++i) {
+      for (int j = 0; j < 2; ++j)
+        t_pred_cost += temporal_predictor_count[i][j] * pred_flag_cost[i][j];
+    }
+    // Cost for signaling the unpredicted segment id.
+    for (int i = 0; i < MAX_SEGMENTS; ++i)
+      t_pred_cost += t_unpred_seg_counts[i] * seg_id_cost[i];
+  }
+
+  // Now choose which coding method to use.
+  if (t_pred_cost < no_pred_cost) {
+    assert(!cm->error_resilient_mode);
+    seg->temporal_update = 1;
+  } else {
+    seg->temporal_update = 0;
+  }
+}
+
+void av1_reset_segment_features(AV1_COMMON *cm) {
+  struct segmentation *seg = &cm->seg;
+
+  // Set up default state for MB feature flags
+  seg->enabled = 0;
+  seg->update_map = 0;
+  seg->update_data = 0;
+  av1_clearall_segfeatures(seg);
+}