| /* |
| * Copyright (c) 2021, Alliance for Open Media. All rights reserved |
| * |
| * This source code is subject to the terms of the BSD 3-Clause Clear License |
| * and the Alliance for Open Media Patent License 1.0. If the BSD 3-Clause Clear |
| * License was not distributed with this source code in the LICENSE file, you |
| * can obtain it at aomedia.org/license/software-license/bsd-3-c-c/. If the |
| * Alliance for Open Media Patent License 1.0 was not distributed with this |
| * source code in the PATENTS file, you can obtain it at |
| * aomedia.org/license/patent-license/. |
| */ |
| |
| #include <math.h> |
| #include <limits.h> |
| |
| #include "config/aom_config.h" |
| |
| #include "av1/common/alloccommon.h" |
| #include "av1/common/av1_common_int.h" |
| #include "av1/common/odintrin.h" |
| #include "av1/common/quant_common.h" |
| #include "av1/common/reconinter.h" |
| #include "av1/encoder/av1_quantize.h" |
| #include "av1/encoder/encoder.h" |
| #include "av1/encoder/extend.h" |
| #include "av1/encoder/firstpass.h" |
| #include "av1/encoder/mcomp.h" |
| #include "av1/encoder/ratectrl.h" |
| #include "av1/encoder/reconinter_enc.h" |
| #include "av1/encoder/segmentation.h" |
| #include "av1/encoder/temporal_filter.h" |
| #include "aom_dsp/aom_dsp_common.h" |
| #include "aom_mem/aom_mem.h" |
| #include "aom_ports/aom_timer.h" |
| #include "aom_ports/mem.h" |
| #include "aom_ports/system_state.h" |
| #include "aom_scale/aom_scale.h" |
| |
| /*!\cond */ |
| |
| // NOTE: All `tf` in this file means `temporal filtering`. |
| |
| // Forward Declaration. |
| static void tf_determine_block_partition(const MV block_mv, const int block_mse, |
| MV *subblock_mvs, int *subblock_mses); |
| |
| /*!\endcond */ |
| /*!\brief Does motion search for blocks in temporal filtering. This is |
| * the first step for temporal filtering. More specifically, given a frame to |
| * be filtered and another frame as reference, this function searches the |
| * reference frame to find out the most similar block as that from the frame |
| * to be filtered. This found block will be further used for weighted |
| * averaging. |
| * |
| * NOTE: Besides doing motion search for the entire block, this function will |
| * also do motion search for each 1/4 sub-block to get more precise |
| * predictions. Then, this function will determines whether to use 4 |
| * sub-blocks to replace the entire block. If we do need to split the |
| * entire block, 4 elements in `subblock_mvs` and `subblock_mses` refer to |
| * the searched motion vector and search error (MSE) w.r.t. each sub-block |
| * respectively. Otherwise, the 4 elements will be the same, all of which |
| * are assigned as the searched motion vector and search error (MSE) for |
| * the entire block. |
| * |
| * \ingroup src_frame_proc |
| * \param[in] cpi Top level encoder instance structure |
| * \param[in] frame_to_filter Pointer to the frame to be filtered |
| * \param[in] ref_frame Pointer to the reference frame |
| * \param[in] block_size Block size used for motion search |
| * \param[in] mb_row Row index of the block in the frame |
| * \param[in] mb_col Column index of the block in the frame |
| * \param[in] ref_mv Reference motion vector, which is commonly |
| * inherited from the motion search result of |
| * previous frame. |
| * \param[out] subblock_mvs Pointer to the motion vectors for 4 sub-blocks |
| * \param[out] subblock_mses Pointer to the search errors (MSE) for 4 |
| * sub-blocks |
| * |
| * Nothing returned. Results are saved in subblock_mvs and subblock_mses. |
| */ |
| static void tf_motion_search(AV1_COMP *cpi, |
| const YV12_BUFFER_CONFIG *frame_to_filter, |
| const YV12_BUFFER_CONFIG *ref_frame, |
| const BLOCK_SIZE block_size, const int mb_row, |
| const int mb_col, MV *ref_mv, MV *subblock_mvs, |
| int *subblock_mses) { |
| // Frame information |
| const int min_frame_size = AOMMIN(cpi->common.width, cpi->common.height); |
| |
| // Block information (ONLY Y-plane is used for motion search). |
| const int mb_height = block_size_high[block_size]; |
| const int mb_width = block_size_wide[block_size]; |
| const int mb_pels = mb_height * mb_width; |
| const int y_stride = frame_to_filter->y_stride; |
| assert(y_stride == ref_frame->y_stride); |
| const int y_offset = mb_row * mb_height * y_stride + mb_col * mb_width; |
| |
| // Save input state. |
| #if CONFIG_FLEX_MVRES |
| const AV1_COMMON *cm = &cpi->common; |
| #if CONFIG_BVCOST_UPDATE |
| const int is_ibc_cost = 0; |
| #endif |
| #endif |
| MACROBLOCK *const mb = &cpi->td.mb; |
| MACROBLOCKD *const mbd = &mb->e_mbd; |
| const struct buf_2d ori_src_buf = mb->plane[0].src; |
| const struct buf_2d ori_pre_buf = mbd->plane[0].pre[0]; |
| |
| // Parameters used for motion search. |
| FULLPEL_MOTION_SEARCH_PARAMS full_ms_params; |
| SUBPEL_MOTION_SEARCH_PARAMS ms_params; |
| const SEARCH_METHODS search_method = NSTEP; |
| const search_site_config *search_site_cfg = |
| cpi->mv_search_params.search_site_cfg[SS_CFG_LOOKAHEAD]; |
| const int step_param = av1_init_search_range( |
| AOMMAX(frame_to_filter->y_crop_width, frame_to_filter->y_crop_height)); |
| const SUBPEL_SEARCH_TYPE subpel_search_type = USE_8_TAPS; |
| const int force_integer_mv = cpi->common.features.cur_frame_force_integer_mv; |
| const MV_COST_TYPE mv_cost_type = |
| min_frame_size >= 720 |
| ? MV_COST_L1_HDRES |
| : (min_frame_size >= 480 ? MV_COST_L1_MIDRES : MV_COST_L1_LOWRES); |
| #if CONFIG_FLEX_MVRES |
| assert(cm->features.fr_mv_precision == MV_PRECISION_ONE_EIGHTH_PEL); |
| const MvSubpelPrecision pb_mv_precision = MV_PRECISION_ONE_EIGHTH_PEL; |
| #endif |
| |
| // Starting position for motion search. |
| FULLPEL_MV start_mv = get_fullmv_from_mv(ref_mv); |
| // Baseline position for motion search (used for rate distortion comparison). |
| #if CONFIG_FLEX_MVRES |
| full_pel_lower_mv_precision(&start_mv, pb_mv_precision); |
| #endif |
| const MV baseline_mv = kZeroMv; |
| |
| // Setup. |
| mb->plane[0].src.buf = frame_to_filter->y_buffer + y_offset; |
| mb->plane[0].src.stride = y_stride; |
| mbd->plane[0].pre[0].buf = ref_frame->y_buffer + y_offset; |
| mbd->plane[0].pre[0].stride = y_stride; |
| // Unused intermediate results for motion search. |
| unsigned int sse, error; |
| int distortion; |
| int cost_list[5]; |
| |
| // Do motion search. |
| int_mv best_mv; // Searched motion vector. |
| int block_mse = INT_MAX; |
| MV block_mv = kZeroMv; |
| |
| av1_make_default_fullpel_ms_params(&full_ms_params, cpi, mb, block_size, |
| &baseline_mv, |
| #if CONFIG_FLEX_MVRES |
| pb_mv_precision, |
| #if CONFIG_BVCOST_UPDATE |
| is_ibc_cost, |
| #endif |
| #endif |
| search_site_cfg, |
| /*fine_search_interval=*/0); |
| av1_set_mv_search_method(&full_ms_params, search_site_cfg, search_method); |
| full_ms_params.run_mesh_search = 1; |
| full_ms_params.mv_cost_params.mv_cost_type = mv_cost_type; |
| |
| av1_full_pixel_search(start_mv, &full_ms_params, step_param, |
| cond_cost_list(cpi, cost_list), &best_mv.as_fullmv, |
| NULL); |
| |
| if (force_integer_mv == 1) { // Only do full search on the entire block. |
| const int mv_row = best_mv.as_mv.row; |
| const int mv_col = best_mv.as_mv.col; |
| best_mv.as_mv.row = GET_MV_SUBPEL(mv_row); |
| best_mv.as_mv.col = GET_MV_SUBPEL(mv_col); |
| const int mv_offset = mv_row * y_stride + mv_col; |
| error = cpi->fn_ptr[block_size].vf( |
| ref_frame->y_buffer + y_offset + mv_offset, y_stride, |
| frame_to_filter->y_buffer + y_offset, y_stride, &sse); |
| block_mse = DIVIDE_AND_ROUND(error, mb_pels); |
| block_mv = best_mv.as_mv; |
| } else { // Do fractional search on the entire block and all sub-blocks. |
| av1_make_default_subpel_ms_params(&ms_params, cpi, mb, block_size, |
| &baseline_mv, |
| #if CONFIG_FLEX_MVRES |
| pb_mv_precision, |
| #endif |
| cost_list); |
| ms_params.forced_stop = EIGHTH_PEL; |
| ms_params.var_params.subpel_search_type = subpel_search_type; |
| // Since we are merely refining the result from full pixel search, we don't |
| // need regularization for subpel search |
| ms_params.mv_cost_params.mv_cost_type = MV_COST_NONE; |
| |
| MV subpel_start_mv = get_mv_from_fullmv(&best_mv.as_fullmv); |
| assert(av1_is_subpelmv_in_range(&ms_params.mv_limits, subpel_start_mv)); |
| #if CONFIG_FLEX_MVRES |
| error = cpi->mv_search_params.find_fractional_mv_step( |
| &mb->e_mbd, cm, &ms_params, subpel_start_mv, &best_mv.as_mv, |
| &distortion, &sse, NULL); |
| #else |
| error = cpi->mv_search_params.find_fractional_mv_step( |
| &mb->e_mbd, &cpi->common, &ms_params, subpel_start_mv, &best_mv.as_mv, |
| &distortion, &sse, NULL); |
| #endif |
| block_mse = DIVIDE_AND_ROUND(error, mb_pels); |
| block_mv = best_mv.as_mv; |
| *ref_mv = best_mv.as_mv; |
| // On 4 sub-blocks. |
| const BLOCK_SIZE subblock_size = ss_size_lookup[block_size][1][1]; |
| const int subblock_height = block_size_high[subblock_size]; |
| const int subblock_width = block_size_wide[subblock_size]; |
| const int subblock_pels = subblock_height * subblock_width; |
| start_mv = get_fullmv_from_mv(ref_mv); |
| |
| #if CONFIG_FLEX_MVRES |
| full_pel_lower_mv_precision(&start_mv, pb_mv_precision); |
| #endif |
| |
| int subblock_idx = 0; |
| for (int i = 0; i < mb_height; i += subblock_height) { |
| for (int j = 0; j < mb_width; j += subblock_width) { |
| const int offset = i * y_stride + j; |
| mb->plane[0].src.buf = frame_to_filter->y_buffer + y_offset + offset; |
| mbd->plane[0].pre[0].buf = ref_frame->y_buffer + y_offset + offset; |
| av1_make_default_fullpel_ms_params(&full_ms_params, cpi, mb, |
| subblock_size, &baseline_mv, |
| #if CONFIG_FLEX_MVRES |
| pb_mv_precision, |
| #if CONFIG_BVCOST_UPDATE |
| is_ibc_cost, |
| #endif |
| #endif |
| search_site_cfg, |
| /*fine_search_interval=*/0); |
| av1_set_mv_search_method(&full_ms_params, search_site_cfg, |
| search_method); |
| full_ms_params.run_mesh_search = 1; |
| full_ms_params.mv_cost_params.mv_cost_type = mv_cost_type; |
| |
| av1_full_pixel_search(start_mv, &full_ms_params, step_param, |
| cond_cost_list(cpi, cost_list), |
| &best_mv.as_fullmv, NULL); |
| |
| av1_make_default_subpel_ms_params(&ms_params, cpi, mb, subblock_size, |
| &baseline_mv, |
| #if CONFIG_FLEX_MVRES |
| pb_mv_precision, |
| #endif |
| cost_list); |
| ms_params.forced_stop = EIGHTH_PEL; |
| ms_params.var_params.subpel_search_type = subpel_search_type; |
| // Since we are merely refining the result from full pixel search, we |
| // don't need regularization for subpel search |
| ms_params.mv_cost_params.mv_cost_type = MV_COST_NONE; |
| |
| subpel_start_mv = get_mv_from_fullmv(&best_mv.as_fullmv); |
| #if CONFIG_FLEX_MVRES |
| error = cpi->mv_search_params.find_fractional_mv_step( |
| &mb->e_mbd, cm, &ms_params, subpel_start_mv, &best_mv.as_mv, |
| &distortion, &sse, NULL); |
| #else |
| error = cpi->mv_search_params.find_fractional_mv_step( |
| &mb->e_mbd, &cpi->common, &ms_params, subpel_start_mv, |
| &best_mv.as_mv, &distortion, &sse, NULL); |
| #endif |
| subblock_mses[subblock_idx] = DIVIDE_AND_ROUND(error, subblock_pels); |
| subblock_mvs[subblock_idx] = best_mv.as_mv; |
| ++subblock_idx; |
| } |
| } |
| } |
| |
| // Restore input state. |
| mb->plane[0].src = ori_src_buf; |
| mbd->plane[0].pre[0] = ori_pre_buf; |
| |
| // Make partition decision. |
| tf_determine_block_partition(block_mv, block_mse, subblock_mvs, |
| subblock_mses); |
| |
| // Do not pass down the reference motion vector if error is too large. |
| const int thresh = (min_frame_size >= 720) ? 12 : 3; |
| if (block_mse > (thresh << (mbd->bd - 8))) { |
| *ref_mv = kZeroMv; |
| } |
| } |
| /*!\cond */ |
| |
| // Determines whether to split the entire block to 4 sub-blocks for filtering. |
| // In particular, this decision is made based on the comparison between the |
| // motion search error of the entire block and the errors of all sub-blocks. |
| // Inputs: |
| // block_mv: Motion vector for the entire block (ONLY as reference). |
| // block_mse: Motion search error (MSE) for the entire block (ONLY as |
| // reference). |
| // subblock_mvs: Pointer to the motion vectors for 4 sub-blocks (will be |
| // modified based on the partition decision). |
| // subblock_mses: Pointer to the search errors (MSE) for 4 sub-blocks (will |
| // be modified based on the partition decision). |
| // Returns: |
| // Nothing will be returned. Results are saved in `subblock_mvs` and |
| // `subblock_mses`. |
| static void tf_determine_block_partition(const MV block_mv, const int block_mse, |
| MV *subblock_mvs, int *subblock_mses) { |
| int min_subblock_mse = INT_MAX; |
| int max_subblock_mse = INT_MIN; |
| int64_t sum_subblock_mse = 0; |
| for (int i = 0; i < 4; ++i) { |
| sum_subblock_mse += subblock_mses[i]; |
| min_subblock_mse = AOMMIN(min_subblock_mse, subblock_mses[i]); |
| max_subblock_mse = AOMMAX(max_subblock_mse, subblock_mses[i]); |
| } |
| |
| // TODO(any): The following magic numbers may be tuned to improve the |
| // performance OR find a way to get rid of these magic numbers. |
| if (((block_mse * 15 < sum_subblock_mse * 4) && |
| max_subblock_mse - min_subblock_mse < 48) || |
| ((block_mse * 14 < sum_subblock_mse * 4) && |
| max_subblock_mse - min_subblock_mse < 24)) { // No split. |
| for (int i = 0; i < 4; ++i) { |
| subblock_mvs[i] = block_mv; |
| subblock_mses[i] = block_mse; |
| } |
| } |
| } |
| |
| /*!\endcond */ |
| /*!\brief Builds predictor for blocks in temporal filtering. This is the |
| * second step for temporal filtering, which is to construct predictions from |
| * all reference frames INCLUDING the frame to be filtered itself. These |
| * predictors are built based on the motion search results (motion vector is |
| * set as 0 for the frame to be filtered), and will be futher used for |
| * weighted averaging. |
| * |
| * \ingroup src_frame_proc |
| * \param[in] ref_frame Pointer to the reference frame (or the frame |
| * to be filtered) |
| * \param[in] mbd Pointer to the block for filtering. Besides |
| * containing the subsampling information of all |
| * planes, this field also gives the searched |
| * motion vector for the entire block, i.e., |
| * `mbd->mi[0]->mv[0]`. This vector should be 0 |
| * if the `ref_frame` itself is the frame to be |
| * filtered. |
| * \param[in] block_size Size of the block |
| * \param[in] mb_row Row index of the block in the frame |
| * \param[in] mb_col Column index of the block in the frame |
| * \param[in] num_planes Number of planes in the frame |
| * \param[in] scale Scaling factor |
| * \param[in] subblock_mvs The motion vectors for each sub-block (row-major |
| * order) |
| * \param[out] pred Pointer to the predictor to be built |
| * |
| * Nothing returned, But the contents of `pred` will be modified. |
| */ |
| static void tf_build_predictor(const YV12_BUFFER_CONFIG *ref_frame, |
| const MACROBLOCKD *mbd, |
| const BLOCK_SIZE block_size, const int mb_row, |
| const int mb_col, const int num_planes, |
| const struct scale_factors *scale, |
| const MV *subblock_mvs, uint16_t *pred) { |
| // Information of the entire block. |
| const int mb_height = block_size_high[block_size]; // Height. |
| const int mb_width = block_size_wide[block_size]; // Width. |
| const int mb_pels = mb_height * mb_width; // Number of pixels. |
| const int mb_y = mb_height * mb_row; // Y-coord (Top-left). |
| const int mb_x = mb_width * mb_col; // X-coord (Top-left). |
| const int bit_depth = mbd->bd; // Bit depth. |
| const int is_intrabc = 0; // Is intra-copied? |
| |
| // Default interpolation filters. |
| const InterpFilter interp_filters = MULTITAP_SHARP2; |
| |
| // Handle Y-plane, U-plane and V-plane (if needed) in sequence. |
| int plane_offset = 0; |
| for (int plane = 0; plane < num_planes; ++plane) { |
| const int subsampling_y = mbd->plane[plane].subsampling_y; |
| const int subsampling_x = mbd->plane[plane].subsampling_x; |
| // Information of each sub-block in current plane. |
| const int plane_h = mb_height >> subsampling_y; // Plane height. |
| const int plane_w = mb_width >> subsampling_x; // Plane width. |
| const int plane_y = mb_y >> subsampling_y; // Y-coord (Top-left). |
| const int plane_x = mb_x >> subsampling_x; // X-coord (Top-left). |
| const int h = plane_h >> 1; // Sub-block height. |
| const int w = plane_w >> 1; // Sub-block width. |
| const int is_y_plane = (plane == 0); // Is Y-plane? |
| |
| const struct buf_2d ref_buf = { NULL, ref_frame->buffers[plane], |
| ref_frame->widths[is_y_plane ? 0 : 1], |
| ref_frame->heights[is_y_plane ? 0 : 1], |
| ref_frame->strides[is_y_plane ? 0 : 1] }; |
| |
| // Handle each subblock. |
| int subblock_idx = 0; |
| for (int i = 0; i < plane_h; i += h) { |
| for (int j = 0; j < plane_w; j += w) { |
| // Choose proper motion vector. |
| const MV mv = subblock_mvs[subblock_idx++]; |
| assert(mv.row >= INT16_MIN && mv.row <= INT16_MAX && |
| mv.col >= INT16_MIN && mv.col <= INT16_MAX); |
| |
| const int y = plane_y + i; |
| const int x = plane_x + j; |
| |
| // Build predictior for each sub-block on current plane. |
| InterPredParams inter_pred_params; |
| av1_init_inter_params(&inter_pred_params, w, h, y, x, subsampling_x, |
| subsampling_y, bit_depth, is_intrabc, scale, |
| &ref_buf, interp_filters); |
| inter_pred_params.conv_params = get_conv_params(0, plane, bit_depth); |
| av1_enc_build_one_inter_predictor(&pred[plane_offset + i * plane_w + j], |
| plane_w, &mv, &inter_pred_params); |
| } |
| } |
| plane_offset += mb_pels; |
| } |
| } |
| /*!\cond */ |
| |
| // Computes temporal filter weights and accumulators for the frame to be |
| // filtered. More concretely, the filter weights for all pixels are the same. |
| // Inputs: |
| // mbd: Pointer to the block for filtering, which is ONLY used to get |
| // subsampling information of all planes as well as the bit-depth. |
| // block_size: Size of the block. |
| // num_planes: Number of planes in the frame. |
| // pred: Pointer to the well-built predictors. |
| // accum: Pointer to the pixel-wise accumulator for filtering. |
| // count: Pointer to the pixel-wise counter fot filtering. |
| // Returns: |
| // Nothing will be returned. But the content to which `accum` and `pred` |
| // point will be modified. |
| void tf_apply_temporal_filter_self(const MACROBLOCKD *mbd, |
| const BLOCK_SIZE block_size, |
| const int num_planes, const uint16_t *pred, |
| uint32_t *accum, uint16_t *count) { |
| // Block information. |
| const int mb_height = block_size_high[block_size]; |
| const int mb_width = block_size_wide[block_size]; |
| const int mb_pels = mb_height * mb_width; |
| |
| int plane_offset = 0; |
| for (int plane = 0; plane < num_planes; ++plane) { |
| const int subsampling_y = mbd->plane[plane].subsampling_y; |
| const int subsampling_x = mbd->plane[plane].subsampling_x; |
| const int h = mb_height >> subsampling_y; // Plane height. |
| const int w = mb_width >> subsampling_x; // Plane width. |
| |
| int pred_idx = 0; |
| for (int i = 0; i < h; ++i) { |
| for (int j = 0; j < w; ++j) { |
| const int idx = plane_offset + pred_idx; // Index with plane shift. |
| const int pred_value = pred[idx]; |
| accum[idx] += TF_WEIGHT_SCALE * pred_value; |
| count[idx] += TF_WEIGHT_SCALE; |
| ++pred_idx; |
| } |
| } |
| plane_offset += mb_pels; |
| } |
| } |
| |
| // Function to compute pixel-wise squared difference between two buffers. |
| // Inputs: |
| // ref: Pointer to reference buffer. |
| // ref_offset: Start position of reference buffer for computation. |
| // ref_stride: Stride for reference buffer. |
| // tgt: Pointer to target buffer. |
| // tgt_offset: Start position of target buffer for computation. |
| // tgt_stride: Stride for target buffer. |
| // height: Height of block for computation. |
| // width: Width of block for computation. |
| // square_diff: Pointer to save the squared differces. |
| // Returns: |
| // Nothing will be returned. But the content to which `square_diff` points |
| // will be modified. |
| static INLINE void compute_square_diff( |
| const uint16_t *ref, const int ref_offset, const int ref_stride, |
| const uint16_t *tgt, const int tgt_offset, const int tgt_stride, |
| const int height, const int width, uint32_t *square_diff) { |
| int ref_idx = 0; |
| int tgt_idx = 0; |
| int idx = 0; |
| for (int i = 0; i < height; ++i) { |
| for (int j = 0; j < width; ++j) { |
| const uint16_t ref_value = ref[ref_offset + ref_idx]; |
| const uint16_t tgt_value = tgt[tgt_offset + tgt_idx]; |
| const uint32_t diff = (ref_value > tgt_value) ? (ref_value - tgt_value) |
| : (tgt_value - ref_value); |
| square_diff[idx] = diff * diff; |
| |
| ++ref_idx; |
| ++tgt_idx; |
| ++idx; |
| } |
| ref_idx += (ref_stride - width); |
| tgt_idx += (tgt_stride - width); |
| } |
| } |
| |
| /*!\endcond */ |
| /*!\brief Applies temporal filtering. NOTE that there are various optimised |
| * versions of this function called where the appropriate instruction set is |
| * supported. |
| * |
| * \ingroup src_frame_proc |
| * \param[in] frame_to_filter Pointer to the frame to be filtered, which is |
| * used as reference to compute squared |
| * difference from the predictor. |
| * \param[in] mbd Pointer to the block for filtering, ONLY used |
| * to get subsampling information for the planes |
| * \param[in] block_size Size of the block |
| * \param[in] mb_row Row index of the block in the frame |
| * \param[in] mb_col Column index of the block in the frame |
| * \param[in] num_planes Number of planes in the frame |
| * \param[in] noise_levels Estimated noise levels for each plane |
| * in the frame (Y,U,V) |
| * \param[in] subblock_mvs Pointer to the motion vectors for 4 sub-blocks |
| * \param[in] subblock_mses Pointer to the search errors (MSE) for 4 |
| * sub-blocks |
| * \param[in] q_factor Quantization factor. This is actually the `q` |
| * defined in libaom, converted from `qindex` |
| * \param[in] filter_strength Filtering strength. This value lies in range |
| * [0, 6] where 6 is the maximum strength. |
| * \param[out] pred Pointer to the well-built predictors |
| * \param[out] accum Pointer to the pixel-wise accumulator for |
| * filtering |
| * \param[out] count Pointer to the pixel-wise counter for |
| * filtering |
| * |
| * Nothing returned, But the contents of `accum`, `pred` and 'count' |
| * will be modified. |
| */ |
| void av1_highbd_apply_temporal_filter_c( |
| const YV12_BUFFER_CONFIG *frame_to_filter, const MACROBLOCKD *mbd, |
| const BLOCK_SIZE block_size, const int mb_row, const int mb_col, |
| const int num_planes, const double *noise_levels, const MV *subblock_mvs, |
| const int *subblock_mses, const int q_factor, const int filter_strength, |
| const uint16_t *pred, uint32_t *accum, uint16_t *count) { |
| // Block information. |
| const int mb_height = block_size_high[block_size]; |
| const int mb_width = block_size_wide[block_size]; |
| const int mb_pels = mb_height * mb_width; |
| // Frame information. |
| const int frame_height = frame_to_filter->y_crop_height; |
| const int frame_width = frame_to_filter->y_crop_width; |
| const int min_frame_size = AOMMIN(frame_height, frame_width); |
| |
| // Allocate memory for pixel-wise squared differences for all planes. They, |
| // regardless of the subsampling, are assigned with memory of size `mb_pels`. |
| uint32_t *square_diff = |
| aom_memalign(16, num_planes * mb_pels * sizeof(uint32_t)); |
| memset(square_diff, 0, num_planes * mb_pels * sizeof(square_diff[0])); |
| |
| int plane_offset = 0; |
| for (int plane = 0; plane < num_planes; ++plane) { |
| // Locate pixel on reference frame. |
| const int plane_h = mb_height >> mbd->plane[plane].subsampling_y; |
| const int plane_w = mb_width >> mbd->plane[plane].subsampling_x; |
| const int frame_stride = frame_to_filter->strides[plane == 0 ? 0 : 1]; |
| const int frame_offset = mb_row * plane_h * frame_stride + mb_col * plane_w; |
| const uint16_t *ref = frame_to_filter->buffers[plane]; |
| compute_square_diff(ref, frame_offset, frame_stride, pred, plane_offset, |
| plane_w, plane_h, plane_w, square_diff + plane_offset); |
| plane_offset += mb_pels; |
| } |
| |
| // Get window size for pixel-wise filtering. |
| assert(TF_WINDOW_LENGTH % 2 == 1); |
| const int half_window = TF_WINDOW_LENGTH >> 1; |
| |
| // Handle planes in sequence. |
| plane_offset = 0; |
| for (int plane = 0; plane < num_planes; ++plane) { |
| const int subsampling_y = mbd->plane[plane].subsampling_y; |
| const int subsampling_x = mbd->plane[plane].subsampling_x; |
| const int h = mb_height >> subsampling_y; // Plane height. |
| const int w = mb_width >> subsampling_x; // Plane width. |
| |
| // Perform filtering. |
| int pred_idx = 0; |
| for (int i = 0; i < h; ++i) { |
| for (int j = 0; j < w; ++j) { |
| // non-local mean approach |
| uint64_t sum_square_diff = 0; |
| int num_ref_pixels = 0; |
| |
| for (int wi = -half_window; wi <= half_window; ++wi) { |
| for (int wj = -half_window; wj <= half_window; ++wj) { |
| const int y = CLIP(i + wi, 0, h - 1); // Y-coord on current plane. |
| const int x = CLIP(j + wj, 0, w - 1); // X-coord on current plane. |
| sum_square_diff += square_diff[plane_offset + y * w + x]; |
| ++num_ref_pixels; |
| } |
| } |
| |
| // Filter U-plane and V-plane using Y-plane. This is because motion |
| // search is only done on Y-plane, so the information from Y-plane will |
| // be more accurate. |
| if (plane != 0) { |
| const int ss_y_shift = subsampling_y - mbd->plane[0].subsampling_y; |
| const int ss_x_shift = subsampling_x - mbd->plane[0].subsampling_x; |
| for (int ii = 0; ii < (1 << ss_y_shift); ++ii) { |
| for (int jj = 0; jj < (1 << ss_x_shift); ++jj) { |
| const int yy = (i << ss_y_shift) + ii; // Y-coord on Y-plane. |
| const int xx = (j << ss_x_shift) + jj; // X-coord on Y-plane. |
| const int ww = w << ss_x_shift; // Width of Y-plane. |
| sum_square_diff += square_diff[yy * ww + xx]; |
| ++num_ref_pixels; |
| } |
| } |
| } |
| |
| // Scale down the difference for high bit depth input. |
| if (mbd->bd > 8) sum_square_diff >>= ((mbd->bd - 8) * 2); |
| |
| // Combine window error and block error, and normalize it. |
| const double window_error = (double)sum_square_diff / num_ref_pixels; |
| const int subblock_idx = (i >= h / 2) * 2 + (j >= w / 2); |
| const double block_error = (double)subblock_mses[subblock_idx]; |
| const double combined_error = |
| (TF_WINDOW_BLOCK_BALANCE_WEIGHT * window_error + block_error) / |
| (TF_WINDOW_BLOCK_BALANCE_WEIGHT + 1) / TF_SEARCH_ERROR_NORM_WEIGHT; |
| |
| // Decay factors for non-local mean approach. |
| // Larger noise -> larger filtering weight. |
| const double n_decay = 0.5 + log(2 * noise_levels[plane] + 5.0); |
| // Smaller q -> smaller filtering weight. |
| const double q_decay = |
| CLIP(pow((double)q_factor / TF_Q_DECAY_THRESHOLD, 2), 1e-5, 1); |
| // Smaller strength -> smaller filtering weight. |
| const double s_decay = CLIP( |
| pow((double)filter_strength / TF_STRENGTH_THRESHOLD, 2), 1e-5, 1); |
| // Larger motion vector -> smaller filtering weight. |
| const MV mv = subblock_mvs[subblock_idx]; |
| const double distance = sqrt(pow(mv.row, 2) + pow(mv.col, 2)); |
| const double distance_threshold = |
| (double)AOMMAX(min_frame_size * TF_SEARCH_DISTANCE_THRESHOLD, 1); |
| const double d_factor = AOMMAX(distance / distance_threshold, 1); |
| |
| // Compute filter weight. |
| const double scaled_error = |
| AOMMIN(combined_error * d_factor / n_decay / q_decay / s_decay, 7); |
| const int weight = (int)(exp(-scaled_error) * TF_WEIGHT_SCALE); |
| |
| const int idx = plane_offset + pred_idx; // Index with plane shift. |
| const int pred_value = pred[idx]; |
| accum[idx] += weight * pred_value; |
| count[idx] += weight; |
| |
| ++pred_idx; |
| } |
| } |
| plane_offset += mb_pels; |
| } |
| |
| aom_free(square_diff); |
| } |
| |
| /*!\brief Normalizes the accumulated filtering result to produce the filtered |
| * frame |
| * |
| * \ingroup src_frame_proc |
| * \param[in] mbd Pointer to the block for filtering, which is |
| * ONLY used to get subsampling information for |
| * all the planes |
| * \param[in] block_size Size of the block |
| * \param[in] mb_row Row index of the block in the frame |
| * \param[in] mb_col Column index of the block in the frame |
| * \param[in] num_planes Number of planes in the frame |
| * \param[in] accum Pointer to the pre-computed accumulator |
| * \param[in] count Pointer to the pre-computed count |
| * \param[out] result_buffer Pointer to result buffer |
| * |
| * Nothing returned, but the content to which `result_buffer` pointer |
| * will be modified. |
| */ |
| static void tf_normalize_filtered_frame( |
| const MACROBLOCKD *mbd, const BLOCK_SIZE block_size, const int mb_row, |
| const int mb_col, const int num_planes, const uint32_t *accum, |
| const uint16_t *count, YV12_BUFFER_CONFIG *result_buffer) { |
| // Block information. |
| const int mb_height = block_size_high[block_size]; |
| const int mb_width = block_size_wide[block_size]; |
| const int mb_pels = mb_height * mb_width; |
| |
| int plane_offset = 0; |
| for (int plane = 0; plane < num_planes; ++plane) { |
| const int plane_h = mb_height >> mbd->plane[plane].subsampling_y; |
| const int plane_w = mb_width >> mbd->plane[plane].subsampling_x; |
| const int frame_stride = result_buffer->strides[plane == 0 ? 0 : 1]; |
| const int frame_offset = mb_row * plane_h * frame_stride + mb_col * plane_w; |
| uint16_t *const buf = result_buffer->buffers[plane]; |
| |
| int plane_idx = 0; // Pixel index on current plane (block-base). |
| int frame_idx = frame_offset; // Pixel index on the entire frame. |
| for (int i = 0; i < plane_h; ++i) { |
| for (int j = 0; j < plane_w; ++j) { |
| const int idx = plane_idx + plane_offset; |
| const uint16_t rounding = count[idx] >> 1; |
| buf[frame_idx] = (uint16_t)OD_DIVU(accum[idx] + rounding, count[idx]); |
| ++plane_idx; |
| ++frame_idx; |
| } |
| frame_idx += (frame_stride - plane_w); |
| } |
| plane_offset += mb_pels; |
| } |
| } |
| /*!\cond */ |
| |
| // Helper function to compute number of blocks on either side of the frame. |
| static INLINE int get_num_blocks(const int frame_length, const int mb_length) { |
| return (frame_length + mb_length - 1) / mb_length; |
| } |
| |
| // Helper function to get `q` used for encoding. |
| static INLINE int get_q(const AV1_COMP *cpi) { |
| const FRAME_TYPE frame_type = |
| (cpi->common.current_frame.frame_number > 1) ? INTER_FRAME : KEY_FRAME; |
| const int q = (int)av1_convert_qindex_to_q( |
| cpi->rc.avg_frame_qindex[frame_type], cpi->common.seq_params.bit_depth); |
| return q; |
| } |
| |
| /*!\endcond */ |
| /*! |
| * \brief Sum and SSE source vs filtered framee difference returned by |
| * temporal filter. |
| */ |
| typedef struct { |
| /*!\cond */ |
| int64_t sum; |
| int64_t sse; |
| /*!\endcond */ |
| } FRAME_DIFF; |
| |
| /*!\brief Does temporal filter for a given frame. |
| * |
| * \ingroup src_frame_proc |
| * \param[in] cpi Top level encoder instance structure |
| * \param[in] frames Frame buffers used for temporal filtering |
| * \param[in] num_frames Number of frames in the frame buffer |
| * \param[in] filter_frame_idx Index of the frame to be filtered |
| * \param[in] is_key_frame Is the to-filter is a key frame |
| * \param[in] block_size Block size used for temporal filtering |
| * \param[in] scale Frame scaling factor |
| * \param[in] noise_levels Estimated noise levels for each plane |
| * in the frame (Y,U,V) |
| * |
| * \return Difference between filtered frame and the original frame |
| * (sum and sse) |
| */ |
| static FRAME_DIFF tf_do_filtering(AV1_COMP *cpi, YV12_BUFFER_CONFIG **frames, |
| const int num_frames, |
| const int filter_frame_idx, |
| const int is_key_frame, |
| const BLOCK_SIZE block_size, |
| const struct scale_factors *scale, |
| const double *noise_levels) { |
| // Basic information. |
| const YV12_BUFFER_CONFIG *const frame_to_filter = frames[filter_frame_idx]; |
| const int frame_height = frame_to_filter->y_crop_height; |
| const int frame_width = frame_to_filter->y_crop_width; |
| const int mb_height = block_size_high[block_size]; |
| const int mb_width = block_size_wide[block_size]; |
| const int mb_pels = mb_height * mb_width; |
| const int mb_rows = get_num_blocks(frame_height, mb_height); |
| const int mb_cols = get_num_blocks(frame_width, mb_width); |
| const int num_planes = av1_num_planes(&cpi->common); |
| const int mi_h = mi_size_high_log2[block_size]; |
| const int mi_w = mi_size_wide_log2[block_size]; |
| assert(num_planes >= 1 && num_planes <= MAX_MB_PLANE); |
| |
| // Quantization factor used in temporal filtering. |
| const int q_factor = get_q(cpi); |
| // Factor to control the filering strength. |
| const int filter_strength = cpi->oxcf.algo_cfg.arnr_strength; |
| |
| // Save input state. |
| MACROBLOCK *const mb = &cpi->td.mb; |
| MACROBLOCKD *const mbd = &mb->e_mbd; |
| uint16_t *input_buffer[MAX_MB_PLANE]; |
| for (int i = 0; i < num_planes; i++) { |
| input_buffer[i] = mbd->plane[i].pre[0].buf; |
| } |
| MB_MODE_INFO **input_mb_mode_info = mbd->mi; |
| |
| // Determine whether the video is with `YUV 4:2:2` format, since the avx2/sse2 |
| // function only supports square block size. We will use C function instead |
| // for videos with `YUV 4:2:2` format. |
| int is_yuv422_format = 0; |
| for (int plane = 1; plane < num_planes; ++plane) { |
| if (mbd->plane[plane].subsampling_x != mbd->plane[plane].subsampling_y) { |
| is_yuv422_format = 1; |
| break; |
| } |
| } |
| |
| // Setup. |
| mbd->block_ref_scale_factors[0] = scale; |
| mbd->block_ref_scale_factors[1] = scale; |
| // A temporary block info used to store state in temporal filtering process. |
| MB_MODE_INFO *tmp_mb_mode_info = (MB_MODE_INFO *)malloc(sizeof(MB_MODE_INFO)); |
| memset(tmp_mb_mode_info, 0, sizeof(MB_MODE_INFO)); |
| mbd->mi = &tmp_mb_mode_info; |
| mbd->mi[0]->motion_mode = SIMPLE_TRANSLATION; |
| // Allocate memory for predictor, accumulator and count. |
| uint16_t *pred = aom_memalign(32, num_planes * mb_pels * sizeof(uint16_t)); |
| uint32_t *accum = aom_memalign(16, num_planes * mb_pels * sizeof(uint32_t)); |
| uint16_t *count = aom_memalign(16, num_planes * mb_pels * sizeof(uint16_t)); |
| memset(pred, 0, num_planes * mb_pels * sizeof(pred[0])); |
| |
| // Do filtering. |
| FRAME_DIFF diff = { 0, 0 }; |
| // Perform temporal filtering block by block. |
| for (int mb_row = 0; mb_row < mb_rows; mb_row++) { |
| av1_set_mv_row_limits(&cpi->common.mi_params, &mb->mv_limits, |
| (mb_row << mi_h), (mb_height >> MI_SIZE_LOG2), |
| cpi->oxcf.border_in_pixels); |
| for (int mb_col = 0; mb_col < mb_cols; mb_col++) { |
| av1_set_mv_col_limits(&cpi->common.mi_params, &mb->mv_limits, |
| (mb_col << mi_w), (mb_width >> MI_SIZE_LOG2), |
| cpi->oxcf.border_in_pixels); |
| memset(accum, 0, num_planes * mb_pels * sizeof(accum[0])); |
| memset(count, 0, num_planes * mb_pels * sizeof(count[0])); |
| MV ref_mv = kZeroMv; // Reference motion vector passed down along frames. |
| // Perform temporal filtering frame by frame. |
| for (int frame = 0; frame < num_frames; frame++) { |
| if (frames[frame] == NULL) continue; |
| |
| // Motion search. |
| MV subblock_mvs[4] = { kZeroMv, kZeroMv, kZeroMv, kZeroMv }; |
| int subblock_mses[4] = { INT_MAX, INT_MAX, INT_MAX, INT_MAX }; |
| if (frame == filter_frame_idx) { // Frame to be filtered. |
| // Change ref_mv sign for following frames. |
| ref_mv.row *= -1; |
| ref_mv.col *= -1; |
| } else { // Other reference frames. |
| tf_motion_search(cpi, frame_to_filter, frames[frame], block_size, |
| mb_row, mb_col, &ref_mv, subblock_mvs, |
| subblock_mses); |
| } |
| tf_build_predictor(frames[frame], mbd, block_size, mb_row, mb_col, |
| num_planes, scale, subblock_mvs, pred); |
| |
| // Perform weighted averaging. |
| if (frame == filter_frame_idx) { // Frame to be filtered. |
| tf_apply_temporal_filter_self(mbd, block_size, num_planes, pred, |
| accum, count); |
| } else { // Other reference frames. |
| // TODO(any): avx2/sse2 version should be changed to align with C |
| // function before using. In particular, current avx2/sse2 function |
| // only supports 32x32 block size, 5x5 filtering window, 8-bit |
| // encoding, and the case when the video is not with `YUV 4:2:2` |
| // format. |
| if (TF_BLOCK_SIZE == BLOCK_32X32 && TF_WINDOW_LENGTH == 5 && |
| !is_yuv422_format) { |
| av1_highbd_apply_temporal_filter( |
| frame_to_filter, mbd, block_size, mb_row, mb_col, num_planes, |
| noise_levels, subblock_mvs, subblock_mses, q_factor, |
| filter_strength, pred, accum, count); |
| } else { |
| av1_highbd_apply_temporal_filter_c( |
| frame_to_filter, mbd, block_size, mb_row, mb_col, num_planes, |
| noise_levels, subblock_mvs, subblock_mses, q_factor, |
| filter_strength, pred, accum, count); |
| } |
| } |
| } |
| tf_normalize_filtered_frame(mbd, block_size, mb_row, mb_col, num_planes, |
| accum, count, &cpi->alt_ref_buffer); |
| |
| if (!is_key_frame) { |
| const int y_height = mb_height >> mbd->plane[0].subsampling_y; |
| const int y_width = mb_width >> mbd->plane[0].subsampling_x; |
| const int source_y_stride = frame_to_filter->y_stride; |
| const int filter_y_stride = cpi->alt_ref_buffer.y_stride; |
| const int source_offset = |
| mb_row * y_height * source_y_stride + mb_col * y_width; |
| const int filter_offset = |
| mb_row * y_height * filter_y_stride + mb_col * y_width; |
| unsigned int sse = 0; |
| cpi->fn_ptr[block_size].vf(frame_to_filter->y_buffer + source_offset, |
| source_y_stride, |
| cpi->alt_ref_buffer.y_buffer + filter_offset, |
| filter_y_stride, &sse); |
| diff.sum += sse; |
| diff.sse += sse * sse; |
| } |
| } |
| } |
| |
| // Restore input state |
| for (int i = 0; i < num_planes; i++) { |
| mbd->plane[i].pre[0].buf = input_buffer[i]; |
| } |
| mbd->mi = input_mb_mode_info; |
| |
| free(tmp_mb_mode_info); |
| aom_free(pred); |
| aom_free(accum); |
| aom_free(count); |
| |
| return diff; |
| } |
| |
| /*!\brief Setups the frame buffer for temporal filtering. This fuction |
| * determines how many frames will be used for temporal filtering and then |
| * groups them into a buffer. This function will also estimate the noise level |
| * of the to-filter frame. |
| * |
| * \ingroup src_frame_proc |
| * \param[in] cpi Top level encoder instance structure |
| * \param[in] filter_frame_lookahead_idx The index of the to-filter frame |
| * in the lookahead buffer cpi->lookahead |
| * \param[in] is_second_arf Whether the to-filter frame is the second ARF. |
| * This field will affect the number of frames |
| * used for filtering. |
| * \param[in,out] frames Pointer to the frame buffer to setup |
| * \param[in,out] num_frames_for_filtering Number of frames used for filtering |
| * \param[in,out] filter_frame_idx Index of the to-filter frame in the setup |
| * frame buffer. |
| * \param[out] noise_levels Pointer to the noise levels of the to-filter |
| * frame, estimated with each plane (in Y, U, V |
| * order). |
| * |
| * Nothing will be returned. But the frame buffer `frames`, number of |
| * frames in the buffer `num_frames_for_filtering`, and the index of |
| * the to-filter frame in the buffer `filter_frame_idx` will be updated |
| * in this function. Estimated noise levels for YUV planes will be |
| * saved in `noise_levels`. |
| */ |
| static void tf_setup_filtering_buffer(const AV1_COMP *cpi, |
| const int filter_frame_lookahead_idx, |
| const int is_second_arf, |
| YV12_BUFFER_CONFIG **frames, |
| int *num_frames_for_filtering, |
| int *filter_frame_idx, |
| double *noise_levels) { |
| // Number of frames used for filtering. Set `arnr_max_frames` as 1 to disable |
| // temporal filtering. |
| int num_frames = AOMMAX(cpi->oxcf.algo_cfg.arnr_max_frames, 1); |
| int num_before = 0; // Number of filtering frames before the to-filter frame. |
| int num_after = 0; // Number of filtering frames after the to-filer frame. |
| const int lookahead_depth = |
| av1_lookahead_depth(cpi->lookahead, cpi->compressor_stage); |
| |
| // Temporal filtering should not go beyond key frames |
| const int key_to_curframe = |
| AOMMAX(cpi->rc.frames_since_key + |
| cpi->gf_group.arf_src_offset[cpi->gf_group.index], |
| 0); |
| const int curframe_to_key = |
| AOMMAX(cpi->rc.frames_to_key - |
| cpi->gf_group.arf_src_offset[cpi->gf_group.index] - 1, |
| 0); |
| |
| // Number of buffered frames before the to-filter frame. |
| const int max_before = |
| AOMMIN(filter_frame_lookahead_idx < -1 ? -filter_frame_lookahead_idx + 1 |
| : filter_frame_lookahead_idx + 1, |
| key_to_curframe); |
| // Number of buffered frames after the to-filter frame. |
| const int max_after = AOMMIN(lookahead_depth - max_before, curframe_to_key); |
| const int lookahead_depth_to_kf = max_before + max_after; |
| |
| const int filter_frame_offset = filter_frame_lookahead_idx < -1 |
| ? -filter_frame_lookahead_idx |
| : filter_frame_lookahead_idx; |
| |
| // Estimate noises for each plane. |
| const struct lookahead_entry *to_filter_buf = av1_lookahead_peek( |
| cpi->lookahead, filter_frame_offset, cpi->compressor_stage); |
| assert(to_filter_buf != NULL); |
| const YV12_BUFFER_CONFIG *to_filter_frame = &to_filter_buf->img; |
| const int num_planes = av1_num_planes(&cpi->common); |
| for (int plane = 0; plane < num_planes; ++plane) { |
| noise_levels[plane] = av1_estimate_noise_from_single_plane( |
| to_filter_frame, plane, cpi->common.seq_params.bit_depth); |
| } |
| // Get quantization factor. |
| const int q = get_q(cpi); |
| |
| // Adjust number of filtering frames based on noise and quantization factor. |
| // Basically, we would like to use more frames to filter low-noise frame such |
| // that the filtered frame can provide better predictions for more frames. |
| // Also, when the quantization factor is small enough (lossless compression), |
| // we will not change the number of frames for key frame filtering, which is |
| // to avoid visual quality drop. |
| int adjust_num = 0; |
| if (num_frames == 1) { // `arnr_max_frames = 1` is used to disable filtering. |
| adjust_num = 0; |
| } else if (filter_frame_lookahead_idx < 0 && q <= 10) { |
| adjust_num = 0; |
| } else if (noise_levels[0] < 0.5) { |
| adjust_num = 6; |
| } else if (noise_levels[0] < 1.0) { |
| adjust_num = 4; |
| } else if (noise_levels[0] < 2.0) { |
| adjust_num = 2; |
| } |
| num_frames = AOMMIN(num_frames + adjust_num, lookahead_depth_to_kf + 1); |
| |
| if (filter_frame_lookahead_idx == -1 || |
| filter_frame_lookahead_idx == 0) { // Key frame. |
| num_before = 0; |
| num_after = AOMMIN(num_frames - 1, max_after); |
| } else if (filter_frame_lookahead_idx < -1) { // Key frame in one-pass mode. |
| num_before = AOMMIN(num_frames - 1, max_before); |
| num_after = 0; |
| } else { |
| num_frames = AOMMIN(num_frames, cpi->rc.gfu_boost / 150); |
| num_frames += !(num_frames & 1); // Make the number odd. |
| // Only use 2 neighbours for the second ARF. |
| if (is_second_arf) num_frames = AOMMIN(num_frames, 3); |
| num_before = AOMMIN(num_frames >> 1, max_before); |
| num_after = AOMMIN(num_frames >> 1, max_after); |
| } |
| num_frames = num_before + 1 + num_after; |
| |
| // Setup the frame buffer. |
| for (int frame = 0; frame < num_frames; ++frame) { |
| const int lookahead_idx = frame - num_before + filter_frame_offset; |
| struct lookahead_entry *buf = av1_lookahead_peek( |
| cpi->lookahead, lookahead_idx, cpi->compressor_stage); |
| assert(buf != NULL); |
| frames[frame] = &buf->img; |
| } |
| *num_frames_for_filtering = num_frames; |
| *filter_frame_idx = num_before; |
| assert(frames[*filter_frame_idx] == to_filter_frame); |
| } |
| |
| /*!\cond */ |
| |
| // A constant number, sqrt(pi / 2), used for noise estimation. |
| static const double SQRT_PI_BY_2 = 1.25331413732; |
| |
| double av1_estimate_noise_from_single_plane(const YV12_BUFFER_CONFIG *frame, |
| const int plane, |
| const int bit_depth) { |
| const int is_y_plane = (plane == 0); |
| const int height = frame->crop_heights[is_y_plane ? 0 : 1]; |
| const int width = frame->crop_widths[is_y_plane ? 0 : 1]; |
| const int stride = frame->strides[is_y_plane ? 0 : 1]; |
| const uint16_t *src16 = frame->buffers[plane]; |
| |
| int64_t accum = 0; |
| int count = 0; |
| for (int i = 1; i < height - 1; ++i) { |
| for (int j = 1; j < width - 1; ++j) { |
| // Setup a small 3x3 matrix. |
| const int center_idx = i * stride + j; |
| int mat[3][3]; |
| for (int ii = -1; ii <= 1; ++ii) { |
| for (int jj = -1; jj <= 1; ++jj) { |
| const int idx = center_idx + ii * stride + jj; |
| mat[ii + 1][jj + 1] = src16[idx]; |
| } |
| } |
| // Compute sobel gradients. |
| const int Gx = (mat[0][0] - mat[0][2]) + (mat[2][0] - mat[2][2]) + |
| 2 * (mat[1][0] - mat[1][2]); |
| const int Gy = (mat[0][0] - mat[2][0]) + (mat[0][2] - mat[2][2]) + |
| 2 * (mat[0][1] - mat[2][1]); |
| const int Ga = ROUND_POWER_OF_TWO(abs(Gx) + abs(Gy), bit_depth - 8); |
| // Accumulate Laplacian. |
| if (Ga < NOISE_ESTIMATION_EDGE_THRESHOLD) { // Only count smooth pixels. |
| const int v = 4 * mat[1][1] - |
| 2 * (mat[0][1] + mat[2][1] + mat[1][0] + mat[1][2]) + |
| (mat[0][0] + mat[0][2] + mat[2][0] + mat[2][2]); |
| accum += ROUND_POWER_OF_TWO(abs(v), bit_depth - 8); |
| ++count; |
| } |
| } |
| } |
| |
| // Return -1.0 (unreliable estimation) if there are too few smooth pixels. |
| return (count < 16) ? -1.0 : (double)accum / (6 * count) * SQRT_PI_BY_2; |
| } |
| |
| int av1_temporal_filter(AV1_COMP *cpi, const int filter_frame_lookahead_idx, |
| int *show_existing_arf) { |
| // Basic informaton of the current frame. |
| const GF_GROUP *const gf_group = &cpi->gf_group; |
| const uint8_t group_idx = gf_group->index; |
| const FRAME_UPDATE_TYPE update_type = gf_group->update_type[group_idx]; |
| // Filter one more ARF if the lookahead index is leq 7 (w.r.t. 9-th frame). |
| // This frame is ALWAYS a show existing frame. |
| const int is_second_arf = |
| (update_type == INTNL_ARF_UPDATE) && |
| (filter_frame_lookahead_idx >= (cpi->gf_group.is_user_specified ? 5 : 7)); |
| // TODO(anyone): Currently, we enforce the filtering strength on internal |
| // ARFs except the second ARF to be zero. We should investigate in which case |
| // it is more beneficial to use non-zero strength filtering. |
| if (update_type == INTNL_ARF_UPDATE && !is_second_arf) { |
| return 0; |
| } |
| |
| // Setup frame buffer for filtering. |
| YV12_BUFFER_CONFIG *frames[MAX_LAG_BUFFERS] = { NULL }; |
| int num_frames_for_filtering = 0; |
| int filter_frame_idx = -1; |
| double noise_levels[MAX_MB_PLANE] = { 0 }; |
| tf_setup_filtering_buffer(cpi, filter_frame_lookahead_idx, is_second_arf, |
| frames, &num_frames_for_filtering, |
| &filter_frame_idx, noise_levels); |
| assert(num_frames_for_filtering > 0); |
| assert(filter_frame_idx < num_frames_for_filtering); |
| |
| // Set showable frame. |
| if (filter_frame_lookahead_idx >= 0) { |
| cpi->common.showable_frame = num_frames_for_filtering == 1 || |
| is_second_arf || |
| (cpi->oxcf.algo_cfg.enable_overlay == 0); |
| } |
| |
| // Do filtering. |
| const int is_key_frame = (filter_frame_lookahead_idx <= 0); |
| // Setup scaling factors. Scaling on each of the arnr frames is not |
| // supported. |
| // ARF is produced at the native frame size and resized when coded. |
| struct scale_factors sf; |
| av1_setup_scale_factors_for_frame( |
| &sf, frames[0]->y_crop_width, frames[0]->y_crop_height, |
| frames[0]->y_crop_width, frames[0]->y_crop_height); |
| const FRAME_DIFF diff = |
| tf_do_filtering(cpi, frames, num_frames_for_filtering, filter_frame_idx, |
| is_key_frame, TF_BLOCK_SIZE, &sf, noise_levels); |
| |
| if (is_key_frame) { // Key frame should always be filtered. |
| return 1; |
| } |
| |
| if (show_existing_arf != NULL || is_second_arf) { |
| const int frame_height = frames[filter_frame_idx]->y_crop_height; |
| const int frame_width = frames[filter_frame_idx]->y_crop_width; |
| const int block_height = block_size_high[TF_BLOCK_SIZE]; |
| const int block_width = block_size_wide[TF_BLOCK_SIZE]; |
| const int mb_rows = get_num_blocks(frame_height, block_height); |
| const int mb_cols = get_num_blocks(frame_width, block_width); |
| const int num_mbs = AOMMAX(1, mb_rows * mb_cols); |
| const float mean = (float)diff.sum / num_mbs; |
| const float std = (float)sqrt((float)diff.sse / num_mbs - mean * mean); |
| |
| aom_clear_system_state(); |
| // TODO(yunqing): This can be combined with TPL q calculation later. |
| cpi->rc.base_frame_target = gf_group->bit_allocation[group_idx]; |
| av1_set_target_rate(cpi, cpi->common.width, cpi->common.height); |
| int top_index = 0; |
| int bottom_index = 0; |
| const int q = av1_rc_pick_q_and_bounds( |
| cpi, &cpi->rc, cpi->oxcf.frm_dim_cfg.width, |
| cpi->oxcf.frm_dim_cfg.height, group_idx, &bottom_index, &top_index); |
| |
| const int ac_q = ROUND_POWER_OF_TWO( |
| av1_ac_quant_QTX(q, 0, cpi->common.seq_params.bit_depth), |
| QUANT_TABLE_BITS); |
| |
| const float threshold = 0.7f * ac_q * ac_q; |
| |
| if (!is_second_arf) { |
| *show_existing_arf = 0; |
| if (mean < threshold && std < mean * 1.2) { |
| *show_existing_arf = 1; |
| } |
| cpi->common.showable_frame |= *show_existing_arf; |
| } else { |
| // Use source frame if the filtered frame becomes very different. |
| if (!(mean < threshold && std < mean * 1.2)) { |
| return 0; |
| } |
| } |
| } |
| |
| return 1; |
| } |
| /*!\endcond */ |