6906d218dd
Modified VP9_COMP struct to include MACROBLOCK *mb. This change makes it feasible in multi-thread case to allocate a mb for each thread. Change-Id: I624d6d1aa9c132362200753e5d90b581b1738d6e
184 lines
6.0 KiB
C
184 lines
6.0 KiB
C
/*
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* Copyright (c) 2010 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 <assert.h>
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#include <limits.h>
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#include "./vpx_scale_rtcd.h"
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#include "vpx_mem/vpx_mem.h"
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#include "vp9/common/vp9_loopfilter.h"
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#include "vp9/common/vp9_onyxc_int.h"
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#include "vp9/common/vp9_quant_common.h"
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#include "vp9/encoder/vp9_encoder.h"
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#include "vp9/encoder/vp9_picklpf.h"
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#include "vp9/encoder/vp9_quantize.h"
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static int get_max_filter_level(const VP9_COMP *cpi) {
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if (cpi->oxcf.pass == 2) {
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return cpi->twopass.section_intra_rating > 8 ? MAX_LOOP_FILTER * 3 / 4
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: MAX_LOOP_FILTER;
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} else {
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return MAX_LOOP_FILTER;
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}
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}
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static int try_filter_frame(const YV12_BUFFER_CONFIG *sd, VP9_COMP *const cpi,
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int filt_level, int partial_frame) {
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VP9_COMMON *const cm = &cpi->common;
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int filt_err;
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vp9_loop_filter_frame(cm->frame_to_show, cm, &cpi->mb->e_mbd, filt_level, 1,
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partial_frame);
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#if CONFIG_VP9_HIGHBITDEPTH
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if (cm->use_highbitdepth) {
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filt_err = vp9_highbd_get_y_sse(sd, cm->frame_to_show, cm->bit_depth);
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} else {
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filt_err = vp9_get_y_sse(sd, cm->frame_to_show);
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}
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#else
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filt_err = vp9_get_y_sse(sd, cm->frame_to_show);
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#endif // CONFIG_VP9_HIGHBITDEPTH
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// Re-instate the unfiltered frame
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vpx_yv12_copy_y(&cpi->last_frame_uf, cm->frame_to_show);
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return filt_err;
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}
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static int search_filter_level(const YV12_BUFFER_CONFIG *sd, VP9_COMP *cpi,
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int partial_frame) {
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const VP9_COMMON *const cm = &cpi->common;
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const struct loopfilter *const lf = &cm->lf;
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const int min_filter_level = 0;
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const int max_filter_level = get_max_filter_level(cpi);
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int filt_direction = 0;
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int best_err, filt_best;
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// Start the search at the previous frame filter level unless it is now out of
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// range.
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int filt_mid = clamp(lf->filter_level, min_filter_level, max_filter_level);
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int filter_step = filt_mid < 16 ? 4 : filt_mid / 4;
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// Sum squared error at each filter level
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int ss_err[MAX_LOOP_FILTER + 1];
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// Set each entry to -1
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vpx_memset(ss_err, 0xFF, sizeof(ss_err));
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// Make a copy of the unfiltered / processed recon buffer
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vpx_yv12_copy_y(cm->frame_to_show, &cpi->last_frame_uf);
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best_err = try_filter_frame(sd, cpi, filt_mid, partial_frame);
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filt_best = filt_mid;
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ss_err[filt_mid] = best_err;
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while (filter_step > 0) {
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const int filt_high = MIN(filt_mid + filter_step, max_filter_level);
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const int filt_low = MAX(filt_mid - filter_step, min_filter_level);
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// Bias against raising loop filter in favor of lowering it.
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int bias = (best_err >> (15 - (filt_mid / 8))) * filter_step;
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if ((cpi->oxcf.pass == 2) && (cpi->twopass.section_intra_rating < 20))
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bias = (bias * cpi->twopass.section_intra_rating) / 20;
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// yx, bias less for large block size
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if (cm->tx_mode != ONLY_4X4)
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bias >>= 1;
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if (filt_direction <= 0 && filt_low != filt_mid) {
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// Get Low filter error score
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if (ss_err[filt_low] < 0) {
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ss_err[filt_low] = try_filter_frame(sd, cpi, filt_low, partial_frame);
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}
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// If value is close to the best so far then bias towards a lower loop
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// filter value.
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if ((ss_err[filt_low] - bias) < best_err) {
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// Was it actually better than the previous best?
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if (ss_err[filt_low] < best_err)
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best_err = ss_err[filt_low];
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filt_best = filt_low;
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}
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}
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// Now look at filt_high
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if (filt_direction >= 0 && filt_high != filt_mid) {
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if (ss_err[filt_high] < 0) {
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ss_err[filt_high] = try_filter_frame(sd, cpi, filt_high, partial_frame);
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}
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// Was it better than the previous best?
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if (ss_err[filt_high] < (best_err - bias)) {
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best_err = ss_err[filt_high];
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filt_best = filt_high;
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}
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}
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// Half the step distance if the best filter value was the same as last time
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if (filt_best == filt_mid) {
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filter_step /= 2;
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filt_direction = 0;
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} else {
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filt_direction = (filt_best < filt_mid) ? -1 : 1;
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filt_mid = filt_best;
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}
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}
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return filt_best;
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}
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void vp9_pick_filter_level(const YV12_BUFFER_CONFIG *sd, VP9_COMP *cpi,
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LPF_PICK_METHOD method) {
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VP9_COMMON *const cm = &cpi->common;
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struct loopfilter *const lf = &cm->lf;
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lf->sharpness_level = cm->frame_type == KEY_FRAME ? 0
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: cpi->oxcf.sharpness;
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if (method == LPF_PICK_MINIMAL_LPF && lf->filter_level) {
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lf->filter_level = 0;
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} else if (method >= LPF_PICK_FROM_Q) {
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const int min_filter_level = 0;
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const int max_filter_level = get_max_filter_level(cpi);
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const int q = vp9_ac_quant(cm->base_qindex, 0, cm->bit_depth);
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// These values were determined by linear fitting the result of the
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// searched level, filt_guess = q * 0.316206 + 3.87252
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#if CONFIG_VP9_HIGHDEPTH
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int filt_guess;
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switch (cm->bit_depth) {
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case VPX_BITS_8:
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filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 1015158, 18);
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break;
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case VPX_BITS_10:
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filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 4060632, 20);
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break;
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case VPX_BITS_12:
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filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 16242526, 22);
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break;
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default:
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assert(0 && "bit_depth should be VPX_BITS_8, VPX_BITS_10 "
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"or VPX_BITS_12");
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return;
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}
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#else
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int filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 1015158, 18);
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#endif // CONFIG_VP9_HIGHBITDEPTH
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if (cm->frame_type == KEY_FRAME)
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filt_guess -= 4;
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lf->filter_level = clamp(filt_guess, min_filter_level, max_filter_level);
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} else {
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lf->filter_level = search_filter_level(sd, cpi,
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method == LPF_PICK_FROM_SUBIMAGE);
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}
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}
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