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Diffstat (limited to '')
| -rw-r--r-- | third_party/aom/av1/encoder/segmentation.c | 244 |
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 0000000000..2e9102745c --- /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); +} |