ref: eb8226b903e105c6192b964ef732aac85b9fce94
dir: /vp9/encoder/vp9_aq_360.c/
/* * Copyright (c) 2013 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 <math.h> #include "vpx_ports/mem.h" #include "vpx_ports/system_state.h" #include "vp9/encoder/vp9_aq_360.h" #include "vp9/encoder/vp9_aq_variance.h" #include "vp9/common/vp9_seg_common.h" #include "vp9/encoder/vp9_ratectrl.h" #include "vp9/encoder/vp9_rd.h" #include "vp9/encoder/vp9_segmentation.h" static const double rate_ratio[MAX_SEGMENTS] = { 1.0, 0.75, 0.6, 0.5, 0.4, 0.3, 0.25 }; // Sets segment id 0 for the equatorial region, 1 for temperate region // and 2 for the polar regions unsigned int vp9_360aq_segment_id(int mi_row, int mi_rows) { if (mi_row < mi_rows / 8 || mi_row > mi_rows - mi_rows / 8) return 2; else if (mi_row < mi_rows / 4 || mi_row > mi_rows - mi_rows / 4) return 1; else return 0; } void vp9_360aq_frame_setup(VP9_COMP *cpi) { VP9_COMMON *cm = &cpi->common; struct segmentation *seg = &cm->seg; int i; if (frame_is_intra_only(cm) || cpi->force_update_segmentation || cm->error_resilient_mode) { vp9_enable_segmentation(seg); vp9_clearall_segfeatures(seg); seg->abs_delta = SEGMENT_DELTADATA; vpx_clear_system_state(); for (i = 0; i < MAX_SEGMENTS; ++i) { int qindex_delta = vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type, cm->base_qindex, rate_ratio[i], cm->bit_depth); // We don't allow qindex 0 in a segment if the base value is not 0. // Q index 0 (lossless) implies 4x4 encoding only and in AQ mode 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 ((cm->base_qindex != 0) && ((cm->base_qindex + qindex_delta) == 0)) { qindex_delta = -cm->base_qindex + 1; } // No need to enable SEG_LVL_ALT_Q for this segment. if (rate_ratio[i] == 1.0) { continue; } vp9_set_segdata(seg, i, SEG_LVL_ALT_Q, qindex_delta); vp9_enable_segfeature(seg, i, SEG_LVL_ALT_Q); } } }