Index: source/libvpx/vp9/encoder/vp9_aq_complexity.c |
=================================================================== |
--- source/libvpx/vp9/encoder/vp9_aq_complexity.c (revision 0) |
+++ source/libvpx/vp9/encoder/vp9_aq_complexity.c (revision 0) |
@@ -0,0 +1,103 @@ |
+/* |
+ * 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/common/vp9_seg_common.h" |
+ |
+#include "vp9/encoder/vp9_segmentation.h" |
+ |
+static const double in_frame_q_adj_ratio[MAX_SEGMENTS] = |
+ {1.0, 2.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0}; |
+ |
+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; |
+ |
+ // Clear down the segment map. |
+ vpx_memset(cpi->segmentation_map, 0, cm->mi_rows * cm->mi_cols); |
+ |
+ // Clear down the complexity map used for rd. |
+ vpx_memset(cpi->complexity_map, 0, cm->mi_rows * cm->mi_cols); |
+ |
+ vp9_enable_segmentation(seg); |
+ vp9_clearall_segfeatures(seg); |
+ |
+ // Select delta coding method. |
+ seg->abs_delta = SEGMENT_DELTADATA; |
+ |
+ // Segment 0 "Q" feature is disabled so it defaults to the baseline Q. |
+ vp9_disable_segfeature(seg, 0, SEG_LVL_ALT_Q); |
+ |
+ // Use some of the segments for in frame Q adjustment. |
+ for (segment = 1; segment < 2; segment++) { |
+ const int qindex_delta = |
+ vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type, cm->base_qindex, |
+ in_frame_q_adj_ratio[segment]); |
+ vp9_enable_segfeature(seg, segment, SEG_LVL_ALT_Q); |
+ vp9_set_segdata(seg, segment, SEG_LVL_ALT_Q, qindex_delta); |
+ } |
+ } |
+} |
+ |
+// Select a segment for the current SB64 |
+void vp9_select_in_frame_q_segment(VP9_COMP *cpi, |
+ int mi_row, int mi_col, |
+ int output_enabled, 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, bw); |
+ const int ymis = MIN(cm->mi_rows - mi_row, bh); |
+ int complexity_metric = 64; |
+ int x, y; |
+ |
+ unsigned char segment; |
+ |
+ if (!output_enabled) { |
+ segment = 0; |
+ } 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); |
+ |
+ if (projected_rate < (target_rate / 4)) { |
+ segment = 1; |
+ } else { |
+ segment = 0; |
+ } |
+ |
+ if (target_rate > 0) { |
+ complexity_metric = |
+ clamp((int)((projected_rate * 64) / target_rate), 16, 255); |
+ } |
+ } |
+ |
+ // 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; |
+ cpi->complexity_map[mi_offset + y * cm->mi_cols + x] = |
+ (unsigned char)complexity_metric; |
+ } |
+ } |
+} |