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| 1 /* |
| 2 * Copyright (c) 2014 The WebM project authors. All Rights Reserved. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license |
| 5 * that can be found in the LICENSE file in the root of the source |
| 6 * tree. An additional intellectual property rights grant can be found |
| 7 * in the file PATENTS. All contributing project authors may |
| 8 * be found in the AUTHORS file in the root of the source tree. |
| 9 */ |
| 10 |
| 11 #include <limits.h> |
| 12 #include <math.h> |
| 13 |
| 14 #include "vp9/common/vp9_seg_common.h" |
| 15 |
| 16 #include "vp9/encoder/vp9_segmentation.h" |
| 17 |
| 18 static const double in_frame_q_adj_ratio[MAX_SEGMENTS] = |
| 19 {1.0, 2.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0}; |
| 20 |
| 21 void vp9_setup_in_frame_q_adj(VP9_COMP *cpi) { |
| 22 VP9_COMMON *const cm = &cpi->common; |
| 23 struct segmentation *const seg = &cm->seg; |
| 24 |
| 25 // Make SURE use of floating point in this function is safe. |
| 26 vp9_clear_system_state(); |
| 27 |
| 28 if (cm->frame_type == KEY_FRAME || |
| 29 cpi->refresh_alt_ref_frame || |
| 30 (cpi->refresh_golden_frame && !cpi->rc.is_src_frame_alt_ref)) { |
| 31 int segment; |
| 32 |
| 33 // Clear down the segment map. |
| 34 vpx_memset(cpi->segmentation_map, 0, cm->mi_rows * cm->mi_cols); |
| 35 |
| 36 // Clear down the complexity map used for rd. |
| 37 vpx_memset(cpi->complexity_map, 0, cm->mi_rows * cm->mi_cols); |
| 38 |
| 39 vp9_enable_segmentation(seg); |
| 40 vp9_clearall_segfeatures(seg); |
| 41 |
| 42 // Select delta coding method. |
| 43 seg->abs_delta = SEGMENT_DELTADATA; |
| 44 |
| 45 // Segment 0 "Q" feature is disabled so it defaults to the baseline Q. |
| 46 vp9_disable_segfeature(seg, 0, SEG_LVL_ALT_Q); |
| 47 |
| 48 // Use some of the segments for in frame Q adjustment. |
| 49 for (segment = 1; segment < 2; segment++) { |
| 50 const int qindex_delta = |
| 51 vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type, cm->base_qindex, |
| 52 in_frame_q_adj_ratio[segment]); |
| 53 vp9_enable_segfeature(seg, segment, SEG_LVL_ALT_Q); |
| 54 vp9_set_segdata(seg, segment, SEG_LVL_ALT_Q, qindex_delta); |
| 55 } |
| 56 } |
| 57 } |
| 58 |
| 59 // Select a segment for the current SB64 |
| 60 void vp9_select_in_frame_q_segment(VP9_COMP *cpi, |
| 61 int mi_row, int mi_col, |
| 62 int output_enabled, int projected_rate) { |
| 63 VP9_COMMON *const cm = &cpi->common; |
| 64 |
| 65 const int mi_offset = mi_row * cm->mi_cols + mi_col; |
| 66 const int bw = num_8x8_blocks_wide_lookup[BLOCK_64X64]; |
| 67 const int bh = num_8x8_blocks_high_lookup[BLOCK_64X64]; |
| 68 const int xmis = MIN(cm->mi_cols - mi_col, bw); |
| 69 const int ymis = MIN(cm->mi_rows - mi_row, bh); |
| 70 int complexity_metric = 64; |
| 71 int x, y; |
| 72 |
| 73 unsigned char segment; |
| 74 |
| 75 if (!output_enabled) { |
| 76 segment = 0; |
| 77 } else { |
| 78 // Rate depends on fraction of a SB64 in frame (xmis * ymis / bw * bh). |
| 79 // It is converted to bits * 256 units. |
| 80 const int target_rate = (cpi->rc.sb64_target_rate * xmis * ymis * 256) / |
| 81 (bw * bh); |
| 82 |
| 83 if (projected_rate < (target_rate / 4)) { |
| 84 segment = 1; |
| 85 } else { |
| 86 segment = 0; |
| 87 } |
| 88 |
| 89 if (target_rate > 0) { |
| 90 complexity_metric = |
| 91 clamp((int)((projected_rate * 64) / target_rate), 16, 255); |
| 92 } |
| 93 } |
| 94 |
| 95 // Fill in the entires in the segment map corresponding to this SB64. |
| 96 for (y = 0; y < ymis; y++) { |
| 97 for (x = 0; x < xmis; x++) { |
| 98 cpi->segmentation_map[mi_offset + y * cm->mi_cols + x] = segment; |
| 99 cpi->complexity_map[mi_offset + y * cm->mi_cols + x] = |
| 100 (unsigned char)complexity_metric; |
| 101 } |
| 102 } |
| 103 } |
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