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vpx/vp9/encoder/vp9_aq_cyclicrefresh.c
Marco 7c69136494 vp9-svc: Re-adjust some aq-mode=3 control parameters. 
Remove an adjustment to two cyclic refresh (aq-mode= 3)
parameters for SVC. The adjustment was to reduce the
delta-qp on second segment, and reduce the motion threshold.
This was done early on in the SVC encoder development,
in the latest codebase removing this adjustment yields
some improvements in metrics.

The avgPSNR/SSIM metrics increase on average by ~1%
(most clip positive gain), for 3 and 2 layer SVC.

Change-Id: I7a4d5114f16b2a1df383dbe6b3fe02940e29e6cc
2018-01-23 20:14:00 -08:00

587 lines
25 KiB
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/*
* 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 "vpx_dsp/vpx_dsp_common.h"
#include "vpx_ports/system_state.h"
#include "vp9/encoder/vp9_aq_cyclicrefresh.h"
#include "vp9/common/vp9_seg_common.h"
#include "vp9/encoder/vp9_ratectrl.h"
#include "vp9/encoder/vp9_segmentation.h"
CYCLIC_REFRESH *vp9_cyclic_refresh_alloc(int mi_rows, int mi_cols) {
size_t last_coded_q_map_size;
CYCLIC_REFRESH *const cr = vpx_calloc(1, sizeof(*cr));
if (cr == NULL) return NULL;
cr->map = vpx_calloc(mi_rows * mi_cols, sizeof(*cr->map));
if (cr->map == NULL) {
vp9_cyclic_refresh_free(cr);
return NULL;
}
last_coded_q_map_size = mi_rows * mi_cols * sizeof(*cr->last_coded_q_map);
cr->last_coded_q_map = vpx_malloc(last_coded_q_map_size);
if (cr->last_coded_q_map == NULL) {
vp9_cyclic_refresh_free(cr);
return NULL;
}
assert(MAXQ <= 255);
memset(cr->last_coded_q_map, MAXQ, last_coded_q_map_size);
return cr;
}
void vp9_cyclic_refresh_free(CYCLIC_REFRESH *cr) {
vpx_free(cr->map);
vpx_free(cr->last_coded_q_map);
vpx_free(cr);
}
// Check if this coding block, of size bsize, should be considered for refresh
// (lower-qp coding). Decision can be based on various factors, such as
// size of the coding block (i.e., below min_block size rejected), coding
// mode, and rate/distortion.
static int candidate_refresh_aq(const CYCLIC_REFRESH *cr, const MODE_INFO *mi,
int64_t rate, int64_t dist, int bsize) {
MV mv = mi->mv[0].as_mv;
// Reject the block for lower-qp coding if projected distortion
// is above the threshold, and any of the following is true:
// 1) mode uses large mv
// 2) mode is an intra-mode
// Otherwise accept for refresh.
if (dist > cr->thresh_dist_sb &&
(mv.row > cr->motion_thresh || mv.row < -cr->motion_thresh ||
mv.col > cr->motion_thresh || mv.col < -cr->motion_thresh ||
!is_inter_block(mi)))
return CR_SEGMENT_ID_BASE;
else if (bsize >= BLOCK_16X16 && rate < cr->thresh_rate_sb &&
is_inter_block(mi) && mi->mv[0].as_int == 0 &&
cr->rate_boost_fac > 10)
// More aggressive delta-q for bigger blocks with zero motion.
return CR_SEGMENT_ID_BOOST2;
else
return CR_SEGMENT_ID_BOOST1;
}
// Compute delta-q for the segment.
static int compute_deltaq(const VP9_COMP *cpi, int q, double rate_factor) {
const CYCLIC_REFRESH *const cr = cpi->cyclic_refresh;
const RATE_CONTROL *const rc = &cpi->rc;
int deltaq = vp9_compute_qdelta_by_rate(rc, cpi->common.frame_type, q,
rate_factor, cpi->common.bit_depth);
if ((-deltaq) > cr->max_qdelta_perc * q / 100) {
deltaq = -cr->max_qdelta_perc * q / 100;
}
return deltaq;
}
// For the just encoded frame, estimate the bits, incorporating the delta-q
// from non-base segment. For now ignore effect of multiple segments
// (with different delta-q). Note this function is called in the postencode
// (called from rc_update_rate_correction_factors()).
int vp9_cyclic_refresh_estimate_bits_at_q(const VP9_COMP *cpi,
double correction_factor) {
const VP9_COMMON *const cm = &cpi->common;
const CYCLIC_REFRESH *const cr = cpi->cyclic_refresh;
int estimated_bits;
int mbs = cm->MBs;
int num8x8bl = mbs << 2;
// Weight for non-base segments: use actual number of blocks refreshed in
// previous/just encoded frame. Note number of blocks here is in 8x8 units.
double weight_segment1 = (double)cr->actual_num_seg1_blocks / num8x8bl;
double weight_segment2 = (double)cr->actual_num_seg2_blocks / num8x8bl;
// Take segment weighted average for estimated bits.
estimated_bits =
(int)((1.0 - weight_segment1 - weight_segment2) *
vp9_estimate_bits_at_q(cm->frame_type, cm->base_qindex, mbs,
correction_factor, cm->bit_depth) +
weight_segment1 *
vp9_estimate_bits_at_q(cm->frame_type,
cm->base_qindex + cr->qindex_delta[1],
mbs, correction_factor, cm->bit_depth) +
weight_segment2 *
vp9_estimate_bits_at_q(cm->frame_type,
cm->base_qindex + cr->qindex_delta[2],
mbs, correction_factor, cm->bit_depth));
return estimated_bits;
}
// Prior to encoding the frame, estimate the bits per mb, for a given q = i and
// a corresponding delta-q (for segment 1). This function is called in the
// rc_regulate_q() to set the base qp index.
// Note: the segment map is set to either 0/CR_SEGMENT_ID_BASE (no refresh) or
// to 1/CR_SEGMENT_ID_BOOST1 (refresh) for each superblock, prior to encoding.
int vp9_cyclic_refresh_rc_bits_per_mb(const VP9_COMP *cpi, int i,
double correction_factor) {
const VP9_COMMON *const cm = &cpi->common;
CYCLIC_REFRESH *const cr = cpi->cyclic_refresh;
int bits_per_mb;
int deltaq = 0;
if (cpi->oxcf.speed < 8)
deltaq = compute_deltaq(cpi, i, cr->rate_ratio_qdelta);
else
deltaq = -(cr->max_qdelta_perc * i) / 200;
// Take segment weighted average for bits per mb.
bits_per_mb = (int)((1.0 - cr->weight_segment) *
vp9_rc_bits_per_mb(cm->frame_type, i,
correction_factor, cm->bit_depth) +
cr->weight_segment *
vp9_rc_bits_per_mb(cm->frame_type, i + deltaq,
correction_factor, cm->bit_depth));
return bits_per_mb;
}
// Prior to coding a given prediction block, of size bsize at (mi_row, mi_col),
// check if we should reset the segment_id, and update the cyclic_refresh map
// and segmentation map.
void vp9_cyclic_refresh_update_segment(VP9_COMP *const cpi, MODE_INFO *const mi,
int mi_row, int mi_col, BLOCK_SIZE bsize,
int64_t rate, int64_t dist, int skip,
struct macroblock_plane *const p) {
const VP9_COMMON *const cm = &cpi->common;
CYCLIC_REFRESH *const cr = cpi->cyclic_refresh;
const int bw = num_8x8_blocks_wide_lookup[bsize];
const int bh = num_8x8_blocks_high_lookup[bsize];
const int xmis = VPXMIN(cm->mi_cols - mi_col, bw);
const int ymis = VPXMIN(cm->mi_rows - mi_row, bh);
const int block_index = mi_row * cm->mi_cols + mi_col;
int refresh_this_block = candidate_refresh_aq(cr, mi, rate, dist, bsize);
// Default is to not update the refresh map.
int new_map_value = cr->map[block_index];
int x = 0;
int y = 0;
int is_skin = 0;
if (refresh_this_block == 0 && bsize <= BLOCK_16X16 &&
cpi->use_skin_detection) {
is_skin =
vp9_compute_skin_block(p[0].src.buf, p[1].src.buf, p[2].src.buf,
p[0].src.stride, p[1].src.stride, bsize, 0, 0);
if (is_skin) refresh_this_block = 1;
}
if (cpi->oxcf.rc_mode == VPX_VBR && mi->ref_frame[0] == GOLDEN_FRAME)
refresh_this_block = 0;
// If this block is labeled for refresh, check if we should reset the
// segment_id.
if (cyclic_refresh_segment_id_boosted(mi->segment_id)) {
mi->segment_id = refresh_this_block;
// Reset segment_id if it will be skipped.
if (skip) mi->segment_id = CR_SEGMENT_ID_BASE;
}
// Update the cyclic refresh map, to be used for setting segmentation map
// for the next frame. If the block will be refreshed this frame, mark it
// as clean. The magnitude of the -ve influences how long before we consider
// it for refresh again.
if (cyclic_refresh_segment_id_boosted(mi->segment_id)) {
new_map_value = -cr->time_for_refresh;
} else if (refresh_this_block) {
// Else if it is accepted as candidate for refresh, and has not already
// been refreshed (marked as 1) then mark it as a candidate for cleanup
// for future time (marked as 0), otherwise don't update it.
if (cr->map[block_index] == 1) new_map_value = 0;
} else {
// Leave it marked as block that is not candidate for refresh.
new_map_value = 1;
}
// Update entries in the cyclic refresh map with new_map_value, and
// copy mbmi->segment_id into global segmentation map.
for (y = 0; y < ymis; y++)
for (x = 0; x < xmis; x++) {
int map_offset = block_index + y * cm->mi_cols + x;
cr->map[map_offset] = new_map_value;
cpi->segmentation_map[map_offset] = mi->segment_id;
}
}
void vp9_cyclic_refresh_update_sb_postencode(VP9_COMP *const cpi,
const MODE_INFO *const mi,
int mi_row, int mi_col,
BLOCK_SIZE bsize) {
const VP9_COMMON *const cm = &cpi->common;
CYCLIC_REFRESH *const cr = cpi->cyclic_refresh;
const int bw = num_8x8_blocks_wide_lookup[bsize];
const int bh = num_8x8_blocks_high_lookup[bsize];
const int xmis = VPXMIN(cm->mi_cols - mi_col, bw);
const int ymis = VPXMIN(cm->mi_rows - mi_row, bh);
const int block_index = mi_row * cm->mi_cols + mi_col;
int x, y;
for (y = 0; y < ymis; y++)
for (x = 0; x < xmis; x++) {
int map_offset = block_index + y * cm->mi_cols + x;
// Inter skip blocks were clearly not coded at the current qindex, so
// don't update the map for them. For cases where motion is non-zero or
// the reference frame isn't the previous frame, the previous value in
// the map for this spatial location is not entirely correct.
if ((!is_inter_block(mi) || !mi->skip) &&
mi->segment_id <= CR_SEGMENT_ID_BOOST2) {
cr->last_coded_q_map[map_offset] =
clamp(cm->base_qindex + cr->qindex_delta[mi->segment_id], 0, MAXQ);
} else if (is_inter_block(mi) && mi->skip &&
mi->segment_id <= CR_SEGMENT_ID_BOOST2) {
cr->last_coded_q_map[map_offset] = VPXMIN(
clamp(cm->base_qindex + cr->qindex_delta[mi->segment_id], 0, MAXQ),
cr->last_coded_q_map[map_offset]);
}
}
}
// From the just encoded frame: update the actual number of blocks that were
// applied the segment delta q, and the amount of low motion in the frame.
// Also check conditions for forcing golden update, or preventing golden
// update if the period is up.
void vp9_cyclic_refresh_postencode(VP9_COMP *const cpi) {
VP9_COMMON *const cm = &cpi->common;
MODE_INFO **mi = cm->mi_grid_visible;
CYCLIC_REFRESH *const cr = cpi->cyclic_refresh;
RATE_CONTROL *const rc = &cpi->rc;
unsigned char *const seg_map = cpi->segmentation_map;
double fraction_low = 0.0;
int force_gf_refresh = 0;
int low_content_frame = 0;
int mi_row, mi_col;
cr->actual_num_seg1_blocks = 0;
cr->actual_num_seg2_blocks = 0;
for (mi_row = 0; mi_row < cm->mi_rows; mi_row++) {
for (mi_col = 0; mi_col < cm->mi_cols; mi_col++) {
MV mv = mi[0]->mv[0].as_mv;
int map_index = mi_row * cm->mi_cols + mi_col;
if (cyclic_refresh_segment_id(seg_map[map_index]) == CR_SEGMENT_ID_BOOST1)
cr->actual_num_seg1_blocks++;
else if (cyclic_refresh_segment_id(seg_map[map_index]) ==
CR_SEGMENT_ID_BOOST2)
cr->actual_num_seg2_blocks++;
// Accumulate low_content_frame.
if (is_inter_block(mi[0]) && abs(mv.row) < 16 && abs(mv.col) < 16)
low_content_frame++;
mi++;
}
mi += 8;
}
// Check for golden frame update: only for non-SVC and non-golden boost.
if (!cpi->use_svc && cpi->ext_refresh_frame_flags_pending == 0 &&
!cpi->oxcf.gf_cbr_boost_pct) {
// Force this frame as a golden update frame if this frame changes the
// resolution (resize_pending != 0).
if (cpi->resize_pending != 0) {
vp9_cyclic_refresh_set_golden_update(cpi);
rc->frames_till_gf_update_due = rc->baseline_gf_interval;
if (rc->frames_till_gf_update_due > rc->frames_to_key)
rc->frames_till_gf_update_due = rc->frames_to_key;
cpi->refresh_golden_frame = 1;
force_gf_refresh = 1;
}
// Update average of low content/motion in the frame.
fraction_low = (double)low_content_frame / (cm->mi_rows * cm->mi_cols);
cr->low_content_avg = (fraction_low + 3 * cr->low_content_avg) / 4;
if (!force_gf_refresh && cpi->refresh_golden_frame == 1 &&
rc->frames_since_key > rc->frames_since_golden + 1) {
// Don't update golden reference if the amount of low_content for the
// current encoded frame is small, or if the recursive average of the
// low_content over the update interval window falls below threshold.
if (fraction_low < 0.65 || cr->low_content_avg < 0.6) {
cpi->refresh_golden_frame = 0;
}
// Reset for next internal.
cr->low_content_avg = fraction_low;
}
}
}
// Set golden frame update interval, for non-svc 1 pass CBR mode.
void vp9_cyclic_refresh_set_golden_update(VP9_COMP *const cpi) {
RATE_CONTROL *const rc = &cpi->rc;
CYCLIC_REFRESH *const cr = cpi->cyclic_refresh;
// Set minimum gf_interval for GF update to a multiple of the refresh period,
// with some max limit. Depending on past encoding stats, GF flag may be
// reset and update may not occur until next baseline_gf_interval.
if (cr->percent_refresh > 0)
rc->baseline_gf_interval = VPXMIN(4 * (100 / cr->percent_refresh), 40);
else
rc->baseline_gf_interval = 40;
if (cpi->oxcf.rc_mode == VPX_VBR) rc->baseline_gf_interval = 20;
if (rc->avg_frame_low_motion < 50 && rc->frames_since_key > 40)
rc->baseline_gf_interval = 10;
}
// Update the segmentation map, and related quantities: cyclic refresh map,
// refresh sb_index, and target number of blocks to be refreshed.
// The map is set to either 0/CR_SEGMENT_ID_BASE (no refresh) or to
// 1/CR_SEGMENT_ID_BOOST1 (refresh) for each superblock.
// Blocks labeled as BOOST1 may later get set to BOOST2 (during the
// encoding of the superblock).
static void cyclic_refresh_update_map(VP9_COMP *const cpi) {
VP9_COMMON *const cm = &cpi->common;
CYCLIC_REFRESH *const cr = cpi->cyclic_refresh;
unsigned char *const seg_map = cpi->segmentation_map;
int i, block_count, bl_index, sb_rows, sb_cols, sbs_in_frame;
int xmis, ymis, x, y;
int consec_zero_mv_thresh = 0;
int qindex_thresh = 0;
int count_sel = 0;
int count_tot = 0;
memset(seg_map, CR_SEGMENT_ID_BASE, cm->mi_rows * cm->mi_cols);
sb_cols = (cm->mi_cols + MI_BLOCK_SIZE - 1) / MI_BLOCK_SIZE;
sb_rows = (cm->mi_rows + MI_BLOCK_SIZE - 1) / MI_BLOCK_SIZE;
sbs_in_frame = sb_cols * sb_rows;
// Number of target blocks to get the q delta (segment 1).
block_count = cr->percent_refresh * cm->mi_rows * cm->mi_cols / 100;
// Set the segmentation map: cycle through the superblocks, starting at
// cr->mb_index, and stopping when either block_count blocks have been found
// to be refreshed, or we have passed through whole frame.
assert(cr->sb_index < sbs_in_frame);
i = cr->sb_index;
cr->target_num_seg_blocks = 0;
if (cpi->oxcf.content != VP9E_CONTENT_SCREEN) {
consec_zero_mv_thresh = 100;
}
qindex_thresh =
cpi->oxcf.content == VP9E_CONTENT_SCREEN
? vp9_get_qindex(&cm->seg, CR_SEGMENT_ID_BOOST2, cm->base_qindex)
: vp9_get_qindex(&cm->seg, CR_SEGMENT_ID_BOOST1, cm->base_qindex);
// More aggressive settings for noisy content.
if (cpi->noise_estimate.enabled && cpi->noise_estimate.level >= kMedium) {
consec_zero_mv_thresh = 60;
qindex_thresh =
VPXMAX(vp9_get_qindex(&cm->seg, CR_SEGMENT_ID_BOOST1, cm->base_qindex),
cm->base_qindex);
}
do {
int sum_map = 0;
int consec_zero_mv_thresh_block = consec_zero_mv_thresh;
// Get the mi_row/mi_col corresponding to superblock index i.
int sb_row_index = (i / sb_cols);
int sb_col_index = i - sb_row_index * sb_cols;
int mi_row = sb_row_index * MI_BLOCK_SIZE;
int mi_col = sb_col_index * MI_BLOCK_SIZE;
assert(mi_row >= 0 && mi_row < cm->mi_rows);
assert(mi_col >= 0 && mi_col < cm->mi_cols);
bl_index = mi_row * cm->mi_cols + mi_col;
// Loop through all 8x8 blocks in superblock and update map.
xmis =
VPXMIN(cm->mi_cols - mi_col, num_8x8_blocks_wide_lookup[BLOCK_64X64]);
ymis =
VPXMIN(cm->mi_rows - mi_row, num_8x8_blocks_high_lookup[BLOCK_64X64]);
if (cpi->noise_estimate.enabled && cpi->noise_estimate.level >= kMedium &&
(xmis <= 2 || ymis <= 2))
consec_zero_mv_thresh_block = 4;
for (y = 0; y < ymis; y++) {
for (x = 0; x < xmis; x++) {
const int bl_index2 = bl_index + y * cm->mi_cols + x;
// If the block is as a candidate for clean up then mark it
// for possible boost/refresh (segment 1). The segment id may get
// reset to 0 later depending on the coding mode.
if (cr->map[bl_index2] == 0) {
count_tot++;
if (cr->last_coded_q_map[bl_index2] > qindex_thresh ||
cpi->consec_zero_mv[bl_index2] < consec_zero_mv_thresh_block) {
sum_map++;
count_sel++;
}
} else if (cr->map[bl_index2] < 0) {
cr->map[bl_index2]++;
}
}
}
// Enforce constant segment over superblock.
// If segment is at least half of superblock, set to 1.
if (sum_map >= xmis * ymis / 2) {
for (y = 0; y < ymis; y++)
for (x = 0; x < xmis; x++) {
seg_map[bl_index + y * cm->mi_cols + x] = CR_SEGMENT_ID_BOOST1;
}
cr->target_num_seg_blocks += xmis * ymis;
}
i++;
if (i == sbs_in_frame) {
i = 0;
}
} while (cr->target_num_seg_blocks < block_count && i != cr->sb_index);
cr->sb_index = i;
cr->reduce_refresh = 0;
if (count_sel<(3 * count_tot)>> 2) cr->reduce_refresh = 1;
}
// Set cyclic refresh parameters.
void vp9_cyclic_refresh_update_parameters(VP9_COMP *const cpi) {
const RATE_CONTROL *const rc = &cpi->rc;
const VP9_COMMON *const cm = &cpi->common;
CYCLIC_REFRESH *const cr = cpi->cyclic_refresh;
int num8x8bl = cm->MBs << 2;
int target_refresh = 0;
double weight_segment_target = 0;
double weight_segment = 0;
int thresh_low_motion = (cm->width < 720) ? 55 : 20;
cr->apply_cyclic_refresh = 1;
if (cm->frame_type == KEY_FRAME || cpi->svc.temporal_layer_id > 0 ||
(!cpi->use_svc && rc->avg_frame_low_motion < thresh_low_motion &&
rc->frames_since_key > 40)) {
cr->apply_cyclic_refresh = 0;
return;
}
cr->percent_refresh = 10;
if (cr->reduce_refresh) cr->percent_refresh = 5;
cr->max_qdelta_perc = 60;
cr->time_for_refresh = 0;
cr->motion_thresh = 32;
cr->rate_boost_fac = 15;
// Use larger delta-qp (increase rate_ratio_qdelta) for first few (~4)
// periods of the refresh cycle, after a key frame.
// Account for larger interval on base layer for temporal layers.
if (cr->percent_refresh > 0 &&
rc->frames_since_key <
(4 * cpi->svc.number_temporal_layers) * (100 / cr->percent_refresh)) {
cr->rate_ratio_qdelta = 3.0;
} else {
cr->rate_ratio_qdelta = 2.0;
if (cpi->noise_estimate.enabled && cpi->noise_estimate.level >= kMedium) {
// Reduce the delta-qp if the estimated source noise is above threshold.
cr->rate_ratio_qdelta = 1.7;
cr->rate_boost_fac = 13;
}
}
// Adjust some parameters for low resolutions.
if (cm->width <= 352 && cm->height <= 288) {
if (rc->avg_frame_bandwidth < 3000) {
cr->motion_thresh = 16;
cr->rate_boost_fac = 13;
} else {
cr->max_qdelta_perc = 70;
cr->rate_ratio_qdelta = VPXMAX(cr->rate_ratio_qdelta, 2.5);
}
}
if (cpi->oxcf.rc_mode == VPX_VBR) {
// To be adjusted for VBR mode, e.g., based on gf period and boost.
// For now use smaller qp-delta (than CBR), no second boosted seg, and
// turn-off (no refresh) on golden refresh (since it's already boosted).
cr->percent_refresh = 10;
cr->rate_ratio_qdelta = 1.5;
cr->rate_boost_fac = 10;
if (cpi->refresh_golden_frame == 1) {
cr->percent_refresh = 0;
cr->rate_ratio_qdelta = 1.0;
}
}
// Weight for segment prior to encoding: take the average of the target
// number for the frame to be encoded and the actual from the previous frame.
// Use the target if its less. To be used for setting the base qp for the
// frame in vp9_rc_regulate_q.
target_refresh = cr->percent_refresh * cm->mi_rows * cm->mi_cols / 100;
weight_segment_target = (double)(target_refresh) / num8x8bl;
weight_segment = (double)((target_refresh + cr->actual_num_seg1_blocks +
cr->actual_num_seg2_blocks) >>
1) /
num8x8bl;
if (weight_segment_target < 7 * weight_segment / 8)
weight_segment = weight_segment_target;
cr->weight_segment = weight_segment;
}
// Setup cyclic background refresh: set delta q and segmentation map.
void vp9_cyclic_refresh_setup(VP9_COMP *const cpi) {
VP9_COMMON *const cm = &cpi->common;
const RATE_CONTROL *const rc = &cpi->rc;
CYCLIC_REFRESH *const cr = cpi->cyclic_refresh;
struct segmentation *const seg = &cm->seg;
if (cm->current_video_frame == 0) cr->low_content_avg = 0.0;
if (!cr->apply_cyclic_refresh || (cpi->force_update_segmentation)) {
// Set segmentation map to 0 and disable.
unsigned char *const seg_map = cpi->segmentation_map;
memset(seg_map, 0, cm->mi_rows * cm->mi_cols);
vp9_disable_segmentation(&cm->seg);
if (cm->frame_type == KEY_FRAME) {
memset(cr->last_coded_q_map, MAXQ,
cm->mi_rows * cm->mi_cols * sizeof(*cr->last_coded_q_map));
cr->sb_index = 0;
cr->reduce_refresh = 0;
}
return;
} else {
int qindex_delta = 0;
int qindex2;
const double q = vp9_convert_qindex_to_q(cm->base_qindex, cm->bit_depth);
vpx_clear_system_state();
// Set rate threshold to some multiple (set to 2 for now) of the target
// rate (target is given by sb64_target_rate and scaled by 256).
cr->thresh_rate_sb = ((int64_t)(rc->sb64_target_rate) << 8) << 2;
// Distortion threshold, quadratic in Q, scale factor to be adjusted.
// q will not exceed 457, so (q * q) is within 32bit; see:
// vp9_convert_qindex_to_q(), vp9_ac_quant(), ac_qlookup*[].
cr->thresh_dist_sb = ((int64_t)(q * q)) << 2;
// Set up segmentation.
// Clear down the segment map.
vp9_enable_segmentation(&cm->seg);
vp9_clearall_segfeatures(seg);
// Select delta coding method.
seg->abs_delta = SEGMENT_DELTADATA;
// Note: setting temporal_update has no effect, as the seg-map coding method
// (temporal or spatial) is determined in vp9_choose_segmap_coding_method(),
// based on the coding cost of each method. For error_resilient mode on the
// last_frame_seg_map is set to 0, so if temporal coding is used, it is
// relative to 0 previous map.
// seg->temporal_update = 0;
// Segment BASE "Q" feature is disabled so it defaults to the baseline Q.
vp9_disable_segfeature(seg, CR_SEGMENT_ID_BASE, SEG_LVL_ALT_Q);
// Use segment BOOST1 for in-frame Q adjustment.
vp9_enable_segfeature(seg, CR_SEGMENT_ID_BOOST1, SEG_LVL_ALT_Q);
// Use segment BOOST2 for more aggressive in-frame Q adjustment.
vp9_enable_segfeature(seg, CR_SEGMENT_ID_BOOST2, SEG_LVL_ALT_Q);
// Set the q delta for segment BOOST1.
qindex_delta = compute_deltaq(cpi, cm->base_qindex, cr->rate_ratio_qdelta);
cr->qindex_delta[1] = qindex_delta;
// Compute rd-mult for segment BOOST1.
qindex2 = clamp(cm->base_qindex + cm->y_dc_delta_q + qindex_delta, 0, MAXQ);
cr->rdmult = vp9_compute_rd_mult(cpi, qindex2);
vp9_set_segdata(seg, CR_SEGMENT_ID_BOOST1, SEG_LVL_ALT_Q, qindex_delta);
// Set a more aggressive (higher) q delta for segment BOOST2.
qindex_delta = compute_deltaq(
cpi, cm->base_qindex,
VPXMIN(CR_MAX_RATE_TARGET_RATIO,
0.1 * cr->rate_boost_fac * cr->rate_ratio_qdelta));
cr->qindex_delta[2] = qindex_delta;
vp9_set_segdata(seg, CR_SEGMENT_ID_BOOST2, SEG_LVL_ALT_Q, qindex_delta);
// Reset if resoluton change has occurred.
if (cpi->resize_pending != 0) vp9_cyclic_refresh_reset_resize(cpi);
// Update the segmentation and refresh map.
cyclic_refresh_update_map(cpi);
}
}
int vp9_cyclic_refresh_get_rdmult(const CYCLIC_REFRESH *cr) {
return cr->rdmult;
}
void vp9_cyclic_refresh_reset_resize(VP9_COMP *const cpi) {
const VP9_COMMON *const cm = &cpi->common;
CYCLIC_REFRESH *const cr = cpi->cyclic_refresh;
memset(cr->map, 0, cm->mi_rows * cm->mi_cols);
memset(cr->last_coded_q_map, MAXQ, cm->mi_rows * cm->mi_cols);
cr->sb_index = 0;
cpi->refresh_golden_frame = 1;
cpi->refresh_alt_ref_frame = 1;
}
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