diff options
Diffstat (limited to 'media/libvpx/libvpx/vp9/encoder/vp9_aq_cyclicrefresh.c')
| -rw-r--r-- | media/libvpx/libvpx/vp9/encoder/vp9_aq_cyclicrefresh.c | 702 |
1 files changed, 702 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vp9/encoder/vp9_aq_cyclicrefresh.c b/media/libvpx/libvpx/vp9/encoder/vp9_aq_cyclicrefresh.c new file mode 100644 index 0000000000..28ab10a13b --- /dev/null +++ b/media/libvpx/libvpx/vp9/encoder/vp9_aq_cyclicrefresh.c @@ -0,0 +1,702 @@ +/* + * 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" + +static const uint8_t VP9_VAR_OFFS[64] = { + 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, + 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, + 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, + 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, + 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 +}; + +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); + cr->counter_encode_maxq_scene_change = 0; + cr->content_mode = 1; + return cr; +} + +void vp9_cyclic_refresh_free(CYCLIC_REFRESH *cr) { + if (cr != NULL) { + 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 (cpi->sf.use_nonrd_pick_mode && + 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 && + cr->content_mode) + rc->baseline_gf_interval = 10; +} + +static int is_superblock_flat_static(VP9_COMP *const cpi, int sb_row_index, + int sb_col_index) { + unsigned int source_variance; + const uint8_t *src_y = cpi->Source->y_buffer; + const int ystride = cpi->Source->y_stride; + unsigned int sse; + const BLOCK_SIZE bsize = BLOCK_64X64; + src_y += (sb_row_index << 6) * ystride + (sb_col_index << 6); + source_variance = + cpi->fn_ptr[bsize].vf(src_y, ystride, VP9_VAR_OFFS, 0, &sse); + if (source_variance == 0) { + uint64_t block_sad; + const uint8_t *last_src_y = cpi->Last_Source->y_buffer; + const int last_ystride = cpi->Last_Source->y_stride; + last_src_y += (sb_row_index << 6) * ystride + (sb_col_index << 6); + block_sad = + cpi->fn_ptr[bsize].sdf(src_y, ystride, last_src_y, last_ystride); + if (block_sad == 0) return 1; + } + return 0; +} + +// 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 && + cr->content_mode) { + 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; + int flat_static_blocks = 0; + int compute_content = 1; + assert(mi_row >= 0 && mi_row < cm->mi_rows); + assert(mi_col >= 0 && mi_col < cm->mi_cols); +#if CONFIG_VP9_HIGHBITDEPTH + if (cpi->common.use_highbitdepth) compute_content = 0; +#endif + if (cr->content_mode == 0 || cpi->Last_Source == NULL || + cpi->Last_Source->y_width != cpi->Source->y_width || + cpi->Last_Source->y_height != cpi->Source->y_height) + compute_content = 0; + 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->content_mode == 0 || + 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) { + // This superblock is a candidate for refresh: + // compute spatial variance and exclude blocks that are spatially flat + // and stationary. Note: this is currently only done for screne content + // mode. + if (compute_content && cr->skip_flat_static_blocks) + flat_static_blocks = + is_superblock_flat_static(cpi, sb_row_index, sb_col_index); + if (!flat_static_blocks) { + // Label this superblock as segment 1. + 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 (cpi->oxcf.content != VP9E_CONTENT_SCREEN) + 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 = 20; + int qp_thresh = VPXMIN((cpi->oxcf.content == VP9E_CONTENT_SCREEN) ? 35 : 20, + rc->best_quality << 1); + int qp_max_thresh = 117 * MAXQ >> 7; + cr->apply_cyclic_refresh = 1; + if (frame_is_intra_only(cm) || cpi->svc.temporal_layer_id > 0 || + is_lossless_requested(&cpi->oxcf) || + rc->avg_frame_qindex[INTER_FRAME] < qp_thresh || + (cpi->use_svc && + cpi->svc.layer_context[cpi->svc.temporal_layer_id].is_key_frame) || + (!cpi->use_svc && cr->content_mode && + rc->avg_frame_low_motion < thresh_low_motion && + rc->frames_since_key > 40) || + (!cpi->use_svc && rc->avg_frame_qindex[INTER_FRAME] > qp_max_thresh && + rc->frames_since_key > 20) || + (cpi->roi.enabled && cpi->roi.skip[BACKGROUND_SEG_SKIP_ID] && + rc->frames_since_key > FRAMES_NO_SKIPPING_AFTER_KEY)) { + 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 (cr->content_mode && 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; + } + } + // For screen-content: keep rate_ratio_qdelta to 2.0 (segment#1 boost) and + // percent_refresh (refresh rate) to 10. But reduce rate boost for segment#2 + // (rate_boost_fac = 10 disables segment#2). + if (cpi->oxcf.content == VP9E_CONTENT_SCREEN) { + // Only enable feature of skipping flat_static blocks for top layer + // under screen content mode. + if (cpi->svc.spatial_layer_id == cpi->svc.number_spatial_layers - 1) + cr->skip_flat_static_blocks = 1; + cr->percent_refresh = (cr->skip_flat_static_blocks) ? 5 : 10; + // Increase the amount of refresh on scene change that is encoded at max Q, + // increase for a few cycles of the refresh period (~100 / percent_refresh). + if (cr->content_mode && cr->counter_encode_maxq_scene_change < 30) + cr->percent_refresh = (cr->skip_flat_static_blocks) ? 10 : 15; + cr->rate_ratio_qdelta = 2.0; + cr->rate_boost_fac = 10; + } + // Adjust some parameters for low resolutions. + if (cm->width * cm->height <= 352 * 288) { + if (rc->avg_frame_bandwidth < 3000) { + cr->motion_thresh = 64; + 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 && !cpi->use_svc) { + 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; + // For screen-content: don't include target for the weight segment, + // since for all flat areas the segment is reset, so its more accurate + // to just use the previous actual number of seg blocks for the weight. + if (cpi->oxcf.content == VP9E_CONTENT_SCREEN) + weight_segment = + (double)(cr->actual_num_seg1_blocks + cr->actual_num_seg2_blocks) / + num8x8bl; + cr->weight_segment = weight_segment; + if (cr->content_mode == 0) { + cr->actual_num_seg1_blocks = + cr->percent_refresh * cm->mi_rows * cm->mi_cols / 100; + cr->actual_num_seg2_blocks = 0; + cr->weight_segment = (double)(cr->actual_num_seg1_blocks) / num8x8bl; + } +} + +// 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; + int scene_change_detected = + cpi->rc.high_source_sad || + (cpi->use_svc && cpi->svc.high_source_sad_superframe); + if (cm->current_video_frame == 0) cr->low_content_avg = 0.0; + // Reset if resoluton change has occurred. + if (cpi->resize_pending != 0) vp9_cyclic_refresh_reset_resize(cpi); + if (!cr->apply_cyclic_refresh || (cpi->force_update_segmentation) || + scene_change_detected) { + // 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 || scene_change_detected) { + 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; + cr->counter_encode_maxq_scene_change = 0; + } + return; + } else { + int qindex_delta = 0; + int qindex2; + const double q = vp9_convert_qindex_to_q(cm->base_qindex, cm->bit_depth); + cr->counter_encode_maxq_scene_change++; + 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); + + // 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 * sizeof(*cr->last_coded_q_map)); + cr->sb_index = 0; + cpi->refresh_golden_frame = 1; + cpi->refresh_alt_ref_frame = 1; + cr->counter_encode_maxq_scene_change = 0; +} + +void vp9_cyclic_refresh_limit_q(const VP9_COMP *cpi, int *q) { + CYCLIC_REFRESH *const cr = cpi->cyclic_refresh; + // For now apply hard limit to frame-level decrease in q, if the cyclic + // refresh is active (percent_refresh > 0). + if (cr->percent_refresh > 0 && cpi->rc.q_1_frame - *q > 8) { + *q = cpi->rc.q_1_frame - 8; + } +} |