| /* |
| * 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; |
| 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) |
| 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) { |
| 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 (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->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 && 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)) { |
| 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; |
| } |
| } |
| // 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->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) { |
| 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; |
| } |
| |
| // 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; |
| } |
| } |
