208 строки
6.7 KiB
C
208 строки
6.7 KiB
C
/*
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* Copyright (c) 2013 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <math.h>
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#include "vpx_ports/mem.h"
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#include "vpx_ports/system_state.h"
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#include "vp9/encoder/vp9_aq_variance.h"
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#include "vp9/common/vp9_seg_common.h"
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#include "vp9/encoder/vp9_ratectrl.h"
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#include "vp9/encoder/vp9_rd.h"
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#include "vp9/encoder/vp9_segmentation.h"
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#define ENERGY_MIN (-4)
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#define ENERGY_MAX (1)
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#define ENERGY_SPAN (ENERGY_MAX - ENERGY_MIN + 1)
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#define ENERGY_IN_BOUNDS(energy)\
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assert((energy) >= ENERGY_MIN && (energy) <= ENERGY_MAX)
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static const double rate_ratio[MAX_SEGMENTS] =
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{2.5, 2.0, 1.5, 1.0, 0.75, 1.0, 1.0, 1.0};
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static const int segment_id[ENERGY_SPAN] = {0, 1, 1, 2, 3, 4};
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#define SEGMENT_ID(i) segment_id[(i) - ENERGY_MIN]
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DECLARE_ALIGNED(16, static const uint8_t, vp9_64_zeros[64]) = {0};
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#if CONFIG_VP9_HIGHBITDEPTH
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DECLARE_ALIGNED(16, static const uint16_t, vp9_highbd_64_zeros[64]) = {0};
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#endif
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unsigned int vp9_vaq_segment_id(int energy) {
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ENERGY_IN_BOUNDS(energy);
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return SEGMENT_ID(energy);
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}
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void vp9_vaq_frame_setup(VP9_COMP *cpi) {
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VP9_COMMON *cm = &cpi->common;
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struct segmentation *seg = &cm->seg;
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int i;
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if (frame_is_intra_only(cm) || cm->error_resilient_mode ||
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cpi->refresh_alt_ref_frame ||
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(cpi->refresh_golden_frame && !cpi->rc.is_src_frame_alt_ref)) {
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vp9_enable_segmentation(seg);
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vp9_clearall_segfeatures(seg);
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seg->abs_delta = SEGMENT_DELTADATA;
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vpx_clear_system_state();
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for (i = 0; i < MAX_SEGMENTS; ++i) {
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int qindex_delta =
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vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type, cm->base_qindex,
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rate_ratio[i], cm->bit_depth);
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// We don't allow qindex 0 in a segment if the base value is not 0.
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// Q index 0 (lossless) implies 4x4 encoding only and in AQ mode a segment
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// Q delta is sometimes applied without going back around the rd loop.
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// This could lead to an illegal combination of partition size and q.
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if ((cm->base_qindex != 0) && ((cm->base_qindex + qindex_delta) == 0)) {
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qindex_delta = -cm->base_qindex + 1;
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}
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// No need to enable SEG_LVL_ALT_Q for this segment.
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if (rate_ratio[i] == 1.0) {
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continue;
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}
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vp9_set_segdata(seg, i, SEG_LVL_ALT_Q, qindex_delta);
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vp9_enable_segfeature(seg, i, SEG_LVL_ALT_Q);
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}
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}
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}
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/* TODO(agrange, paulwilkins): The block_variance calls the unoptimized versions
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* of variance() and highbd_8_variance(). It should not.
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*/
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static void aq_variance(const uint8_t *a, int a_stride,
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const uint8_t *b, int b_stride,
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int w, int h, unsigned int *sse, int *sum) {
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int i, j;
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*sum = 0;
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*sse = 0;
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for (i = 0; i < h; i++) {
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for (j = 0; j < w; j++) {
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const int diff = a[j] - b[j];
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*sum += diff;
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*sse += diff * diff;
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}
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a += a_stride;
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b += b_stride;
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}
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}
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#if CONFIG_VP9_HIGHBITDEPTH
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static void aq_highbd_variance64(const uint8_t *a8, int a_stride,
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const uint8_t *b8, int b_stride,
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int w, int h, uint64_t *sse, uint64_t *sum) {
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int i, j;
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uint16_t *a = CONVERT_TO_SHORTPTR(a8);
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uint16_t *b = CONVERT_TO_SHORTPTR(b8);
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*sum = 0;
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*sse = 0;
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for (i = 0; i < h; i++) {
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for (j = 0; j < w; j++) {
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const int diff = a[j] - b[j];
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*sum += diff;
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*sse += diff * diff;
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}
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a += a_stride;
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b += b_stride;
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}
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}
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static void aq_highbd_8_variance(const uint8_t *a8, int a_stride,
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const uint8_t *b8, int b_stride,
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int w, int h, unsigned int *sse, int *sum) {
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uint64_t sse_long = 0;
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uint64_t sum_long = 0;
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aq_highbd_variance64(a8, a_stride, b8, b_stride, w, h, &sse_long, &sum_long);
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*sse = (unsigned int)sse_long;
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*sum = (int)sum_long;
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}
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#endif // CONFIG_VP9_HIGHBITDEPTH
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static unsigned int block_variance(VP9_COMP *cpi, MACROBLOCK *x,
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BLOCK_SIZE bs) {
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MACROBLOCKD *xd = &x->e_mbd;
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unsigned int var, sse;
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int right_overflow = (xd->mb_to_right_edge < 0) ?
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((-xd->mb_to_right_edge) >> 3) : 0;
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int bottom_overflow = (xd->mb_to_bottom_edge < 0) ?
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((-xd->mb_to_bottom_edge) >> 3) : 0;
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if (right_overflow || bottom_overflow) {
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const int bw = 8 * num_8x8_blocks_wide_lookup[bs] - right_overflow;
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const int bh = 8 * num_8x8_blocks_high_lookup[bs] - bottom_overflow;
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int avg;
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#if CONFIG_VP9_HIGHBITDEPTH
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if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
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aq_highbd_8_variance(x->plane[0].src.buf, x->plane[0].src.stride,
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CONVERT_TO_BYTEPTR(vp9_highbd_64_zeros), 0, bw, bh,
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&sse, &avg);
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sse >>= 2 * (xd->bd - 8);
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avg >>= (xd->bd - 8);
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} else {
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aq_variance(x->plane[0].src.buf, x->plane[0].src.stride,
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vp9_64_zeros, 0, bw, bh, &sse, &avg);
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}
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#else
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aq_variance(x->plane[0].src.buf, x->plane[0].src.stride,
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vp9_64_zeros, 0, bw, bh, &sse, &avg);
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#endif // CONFIG_VP9_HIGHBITDEPTH
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var = sse - (((int64_t)avg * avg) / (bw * bh));
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return (256 * var) / (bw * bh);
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} else {
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#if CONFIG_VP9_HIGHBITDEPTH
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if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
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var = cpi->fn_ptr[bs].vf(x->plane[0].src.buf,
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x->plane[0].src.stride,
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CONVERT_TO_BYTEPTR(vp9_highbd_64_zeros),
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0, &sse);
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} else {
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var = cpi->fn_ptr[bs].vf(x->plane[0].src.buf,
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x->plane[0].src.stride,
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vp9_64_zeros, 0, &sse);
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}
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#else
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var = cpi->fn_ptr[bs].vf(x->plane[0].src.buf,
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x->plane[0].src.stride,
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vp9_64_zeros, 0, &sse);
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#endif // CONFIG_VP9_HIGHBITDEPTH
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return (256 * var) >> num_pels_log2_lookup[bs];
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}
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}
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double vp9_log_block_var(VP9_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bs) {
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unsigned int var = block_variance(cpi, x, bs);
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vpx_clear_system_state();
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return log(var + 1.0);
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}
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#define DEFAULT_E_MIDPOINT 10.0
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int vp9_block_energy(VP9_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bs) {
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double energy;
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double energy_midpoint;
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vpx_clear_system_state();
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energy_midpoint =
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(cpi->oxcf.pass == 2) ? cpi->twopass.mb_av_energy : DEFAULT_E_MIDPOINT;
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energy = vp9_log_block_var(cpi, x, bs) - energy_midpoint;
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return clamp((int)round(energy), ENERGY_MIN, ENERGY_MAX);
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}
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