1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libvpx/vp9/encoder/vp9_picklpf.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,205 @@
1.4 +/*
1.5 + * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
1.6 + *
1.7 + * Use of this source code is governed by a BSD-style license
1.8 + * that can be found in the LICENSE file in the root of the source
1.9 + * tree. An additional intellectual property rights grant can be found
1.10 + * in the file PATENTS. All contributing project authors may
1.11 + * be found in the AUTHORS file in the root of the source tree.
1.12 + */
1.13 +
1.14 +#include <assert.h>
1.15 +#include <limits.h>
1.16 +#include "vp9/common/vp9_onyxc_int.h"
1.17 +#include "vp9/encoder/vp9_onyx_int.h"
1.18 +#include "vp9/encoder/vp9_picklpf.h"
1.19 +#include "vp9/encoder/vp9_quantize.h"
1.20 +#include "vpx_mem/vpx_mem.h"
1.21 +#include "vpx_scale/vpx_scale.h"
1.22 +#include "vp9/common/vp9_alloccommon.h"
1.23 +#include "vp9/common/vp9_loopfilter.h"
1.24 +#include "./vpx_scale_rtcd.h"
1.25 +
1.26 +void vp9_yv12_copy_partial_frame_c(YV12_BUFFER_CONFIG *src_ybc,
1.27 + YV12_BUFFER_CONFIG *dst_ybc, int fraction) {
1.28 + const int height = src_ybc->y_height;
1.29 + const int stride = src_ybc->y_stride;
1.30 + const int offset = stride * ((height >> 5) * 16 - 8);
1.31 + const int lines_to_copy = MAX(height >> (fraction + 4), 1) << 4;
1.32 +
1.33 + assert(src_ybc->y_stride == dst_ybc->y_stride);
1.34 + vpx_memcpy(dst_ybc->y_buffer + offset, src_ybc->y_buffer + offset,
1.35 + stride * (lines_to_copy + 16));
1.36 +}
1.37 +
1.38 +static int calc_partial_ssl_err(YV12_BUFFER_CONFIG *source,
1.39 + YV12_BUFFER_CONFIG *dest, int Fraction) {
1.40 + int i, j;
1.41 + int Total = 0;
1.42 + int srcoffset, dstoffset;
1.43 + uint8_t *src = source->y_buffer;
1.44 + uint8_t *dst = dest->y_buffer;
1.45 +
1.46 + int linestocopy = (source->y_height >> (Fraction + 4));
1.47 +
1.48 + if (linestocopy < 1)
1.49 + linestocopy = 1;
1.50 +
1.51 + linestocopy <<= 4;
1.52 +
1.53 +
1.54 + srcoffset = source->y_stride * (dest->y_height >> 5) * 16;
1.55 + dstoffset = dest->y_stride * (dest->y_height >> 5) * 16;
1.56 +
1.57 + src += srcoffset;
1.58 + dst += dstoffset;
1.59 +
1.60 + // Loop through the raw Y plane and reconstruction data summing the square
1.61 + // differences.
1.62 + for (i = 0; i < linestocopy; i += 16) {
1.63 + for (j = 0; j < source->y_width; j += 16) {
1.64 + unsigned int sse;
1.65 + Total += vp9_mse16x16(src + j, source->y_stride, dst + j, dest->y_stride,
1.66 + &sse);
1.67 + }
1.68 +
1.69 + src += 16 * source->y_stride;
1.70 + dst += 16 * dest->y_stride;
1.71 + }
1.72 +
1.73 + return Total;
1.74 +}
1.75 +
1.76 +// Enforce a minimum filter level based upon baseline Q
1.77 +static int get_min_filter_level(VP9_COMP *cpi, int base_qindex) {
1.78 + int min_filter_level;
1.79 + min_filter_level = 0;
1.80 +
1.81 + return min_filter_level;
1.82 +}
1.83 +
1.84 +// Enforce a maximum filter level based upon baseline Q
1.85 +static int get_max_filter_level(VP9_COMP *cpi, int base_qindex) {
1.86 + int max_filter_level = MAX_LOOP_FILTER;
1.87 + (void)base_qindex;
1.88 +
1.89 + if (cpi->twopass.section_intra_rating > 8)
1.90 + max_filter_level = MAX_LOOP_FILTER * 3 / 4;
1.91 +
1.92 + return max_filter_level;
1.93 +}
1.94 +
1.95 +
1.96 +// Stub function for now Alt LF not used
1.97 +void vp9_set_alt_lf_level(VP9_COMP *cpi, int filt_val) {
1.98 +}
1.99 +
1.100 +void vp9_pick_filter_level(YV12_BUFFER_CONFIG *sd, VP9_COMP *cpi, int partial) {
1.101 + VP9_COMMON *const cm = &cpi->common;
1.102 + struct loopfilter *const lf = &cm->lf;
1.103 +
1.104 + int best_err = 0;
1.105 + int filt_err = 0;
1.106 + const int min_filter_level = get_min_filter_level(cpi, cm->base_qindex);
1.107 + const int max_filter_level = get_max_filter_level(cpi, cm->base_qindex);
1.108 +
1.109 + int filter_step;
1.110 + int filt_high = 0;
1.111 + // Start search at previous frame filter level
1.112 + int filt_mid = lf->filter_level;
1.113 + int filt_low = 0;
1.114 + int filt_best;
1.115 + int filt_direction = 0;
1.116 +
1.117 + int Bias = 0; // Bias against raising loop filter in favor of lowering it.
1.118 +
1.119 + // Make a copy of the unfiltered / processed recon buffer
1.120 + vpx_yv12_copy_y(cm->frame_to_show, &cpi->last_frame_uf);
1.121 +
1.122 + lf->sharpness_level = cm->frame_type == KEY_FRAME ? 0
1.123 + : cpi->oxcf.Sharpness;
1.124 +
1.125 + // Start the search at the previous frame filter level unless it is now out of
1.126 + // range.
1.127 + filt_mid = clamp(lf->filter_level, min_filter_level, max_filter_level);
1.128 +
1.129 + // Define the initial step size
1.130 + filter_step = filt_mid < 16 ? 4 : filt_mid / 4;
1.131 +
1.132 + // Get baseline error score
1.133 + vp9_set_alt_lf_level(cpi, filt_mid);
1.134 + vp9_loop_filter_frame(cm, &cpi->mb.e_mbd, filt_mid, 1, partial);
1.135 +
1.136 + best_err = vp9_calc_ss_err(sd, cm->frame_to_show);
1.137 + filt_best = filt_mid;
1.138 +
1.139 + // Re-instate the unfiltered frame
1.140 + vpx_yv12_copy_y(&cpi->last_frame_uf, cm->frame_to_show);
1.141 +
1.142 + while (filter_step > 0) {
1.143 + Bias = (best_err >> (15 - (filt_mid / 8))) * filter_step;
1.144 +
1.145 + if (cpi->twopass.section_intra_rating < 20)
1.146 + Bias = Bias * cpi->twopass.section_intra_rating / 20;
1.147 +
1.148 + // yx, bias less for large block size
1.149 + if (cpi->common.tx_mode != ONLY_4X4)
1.150 + Bias >>= 1;
1.151 +
1.152 + filt_high = ((filt_mid + filter_step) > max_filter_level)
1.153 + ? max_filter_level
1.154 + : (filt_mid + filter_step);
1.155 + filt_low = ((filt_mid - filter_step) < min_filter_level)
1.156 + ? min_filter_level
1.157 + : (filt_mid - filter_step);
1.158 +
1.159 + if ((filt_direction <= 0) && (filt_low != filt_mid)) {
1.160 + // Get Low filter error score
1.161 + vp9_set_alt_lf_level(cpi, filt_low);
1.162 + vp9_loop_filter_frame(cm, &cpi->mb.e_mbd, filt_low, 1, partial);
1.163 +
1.164 + filt_err = vp9_calc_ss_err(sd, cm->frame_to_show);
1.165 +
1.166 + // Re-instate the unfiltered frame
1.167 + vpx_yv12_copy_y(&cpi->last_frame_uf, cm->frame_to_show);
1.168 +
1.169 + // If value is close to the best so far then bias towards a lower loop
1.170 + // filter value.
1.171 + if ((filt_err - Bias) < best_err) {
1.172 + // Was it actually better than the previous best?
1.173 + if (filt_err < best_err)
1.174 + best_err = filt_err;
1.175 +
1.176 + filt_best = filt_low;
1.177 + }
1.178 + }
1.179 +
1.180 + // Now look at filt_high
1.181 + if ((filt_direction >= 0) && (filt_high != filt_mid)) {
1.182 + vp9_set_alt_lf_level(cpi, filt_high);
1.183 + vp9_loop_filter_frame(cm, &cpi->mb.e_mbd, filt_high, 1, partial);
1.184 +
1.185 + filt_err = vp9_calc_ss_err(sd, cm->frame_to_show);
1.186 +
1.187 + // Re-instate the unfiltered frame
1.188 + vpx_yv12_copy_y(&cpi->last_frame_uf, cm->frame_to_show);
1.189 +
1.190 + // Was it better than the previous best?
1.191 + if (filt_err < (best_err - Bias)) {
1.192 + best_err = filt_err;
1.193 + filt_best = filt_high;
1.194 + }
1.195 + }
1.196 +
1.197 + // Half the step distance if the best filter value was the same as last time
1.198 + if (filt_best == filt_mid) {
1.199 + filter_step = filter_step / 2;
1.200 + filt_direction = 0;
1.201 + } else {
1.202 + filt_direction = (filt_best < filt_mid) ? -1 : 1;
1.203 + filt_mid = filt_best;
1.204 + }
1.205 + }
1.206 +
1.207 + lf->filter_level = filt_best;
1.208 +}
