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Diffstat (limited to 'third_party/aom/av1/encoder/temporal_filter.c')
| -rw-r--r-- | third_party/aom/av1/encoder/temporal_filter.c | 719 |
1 files changed, 719 insertions, 0 deletions
diff --git a/third_party/aom/av1/encoder/temporal_filter.c b/third_party/aom/av1/encoder/temporal_filter.c new file mode 100644 index 000000000..de962fe84 --- /dev/null +++ b/third_party/aom/av1/encoder/temporal_filter.c @@ -0,0 +1,719 @@ +/* + * Copyright (c) 2016, Alliance for Open Media. All rights reserved + * + * This source code is subject to the terms of the BSD 2 Clause License and + * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License + * was not distributed with this source code in the LICENSE file, you can + * obtain it at www.aomedia.org/license/software. 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 www.aomedia.org/license/patent. + */ + +#include <math.h> +#include <limits.h> + +#include "./aom_config.h" +#include "av1/common/alloccommon.h" +#include "av1/common/onyxc_int.h" +#include "av1/common/quant_common.h" +#include "av1/common/reconinter.h" +#include "av1/common/odintrin.h" +#include "av1/encoder/av1_quantize.h" +#include "av1/encoder/extend.h" +#include "av1/encoder/firstpass.h" +#include "av1/encoder/mcomp.h" +#include "av1/encoder/encoder.h" +#include "av1/encoder/ratectrl.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/mem.h" +#include "aom_ports/aom_timer.h" +#include "aom_scale/aom_scale.h" + +static void temporal_filter_predictors_mb_c( + MACROBLOCKD *xd, uint8_t *y_mb_ptr, uint8_t *u_mb_ptr, uint8_t *v_mb_ptr, + int stride, int uv_block_width, int uv_block_height, int mv_row, int mv_col, + uint8_t *pred, struct scale_factors *scale, int x, int y) { + const int which_mv = 0; + const MV mv = { mv_row, mv_col }; + enum mv_precision mv_precision_uv; + int uv_stride; + // TODO(angiebird): change plane setting accordingly + ConvolveParams conv_params = get_conv_params(which_mv, 0); + +#if USE_TEMPORALFILTER_12TAP +#if CONFIG_DUAL_FILTER + const InterpFilter interp_filter[4] = { TEMPORALFILTER_12TAP, + TEMPORALFILTER_12TAP, + TEMPORALFILTER_12TAP, + TEMPORALFILTER_12TAP }; +#else + const InterpFilter interp_filter = TEMPORALFILTER_12TAP; +#endif + (void)xd; +#else + const InterpFilter interp_filter = xd->mi[0]->mbmi.interp_filter; +#endif // USE_TEMPORALFILTER_12TAP +#if CONFIG_GLOBAL_MOTION || CONFIG_WARPED_MOTION + WarpTypesAllowed warp_types; + memset(&warp_types, 0, sizeof(WarpTypesAllowed)); +#endif // CONFIG_GLOBAL_MOTION || CONFIG_WARPED_MOTION + + if (uv_block_width == 8) { + uv_stride = (stride + 1) >> 1; + mv_precision_uv = MV_PRECISION_Q4; + } else { + uv_stride = stride; + mv_precision_uv = MV_PRECISION_Q3; + } + +#if CONFIG_HIGHBITDEPTH + if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) { + av1_highbd_build_inter_predictor(y_mb_ptr, stride, &pred[0], 16, &mv, scale, + 16, 16, which_mv, interp_filter, +#if CONFIG_GLOBAL_MOTION || CONFIG_WARPED_MOTION + &warp_types, x, y, +#endif // CONFIG_GLOBAL_MOTION || CONFIG_WARPED_MOTION + 0, MV_PRECISION_Q3, x, y, xd); + + av1_highbd_build_inter_predictor(u_mb_ptr, uv_stride, &pred[256], + uv_block_width, &mv, scale, uv_block_width, + uv_block_height, which_mv, interp_filter, +#if CONFIG_GLOBAL_MOTION || CONFIG_WARPED_MOTION + &warp_types, x, y, +#endif // CONFIG_GLOBAL_MOTION || CONFIG_WARPED_MOTION + 1, mv_precision_uv, x, y, xd); + + av1_highbd_build_inter_predictor(v_mb_ptr, uv_stride, &pred[512], + uv_block_width, &mv, scale, uv_block_width, + uv_block_height, which_mv, interp_filter, +#if CONFIG_GLOBAL_MOTION || CONFIG_WARPED_MOTION + &warp_types, x, y, +#endif // CONFIG_GLOBAL_MOTION || CONFIG_WARPED_MOTION + 2, mv_precision_uv, x, y, xd); + return; + } +#endif // CONFIG_HIGHBITDEPTH + av1_build_inter_predictor(y_mb_ptr, stride, &pred[0], 16, &mv, scale, 16, 16, + &conv_params, interp_filter, +#if CONFIG_GLOBAL_MOTION || CONFIG_WARPED_MOTION + &warp_types, x, y, 0, 0, +#endif // CONFIG_GLOBAL_MOTION || CONFIG_WARPED_MOTION + MV_PRECISION_Q3, x, y, xd); + + av1_build_inter_predictor(u_mb_ptr, uv_stride, &pred[256], uv_block_width, + &mv, scale, uv_block_width, uv_block_height, + &conv_params, interp_filter, +#if CONFIG_GLOBAL_MOTION || CONFIG_WARPED_MOTION + &warp_types, x, y, 1, 0, +#endif // CONFIG_GLOBAL_MOTION || CONFIG_WARPED_MOTION + mv_precision_uv, x, y, xd); + + av1_build_inter_predictor(v_mb_ptr, uv_stride, &pred[512], uv_block_width, + &mv, scale, uv_block_width, uv_block_height, + &conv_params, interp_filter, +#if CONFIG_GLOBAL_MOTION || CONFIG_WARPED_MOTION + &warp_types, x, y, 2, 0, +#endif // CONFIG_GLOBAL_MOTION || CONFIG_WARPED_MOTION + mv_precision_uv, x, y, xd); +} + +void av1_temporal_filter_apply_c(uint8_t *frame1, unsigned int stride, + uint8_t *frame2, unsigned int block_width, + unsigned int block_height, int strength, + int filter_weight, unsigned int *accumulator, + uint16_t *count) { + unsigned int i, j, k; + int modifier; + int byte = 0; + const int rounding = strength > 0 ? 1 << (strength - 1) : 0; + + for (i = 0, k = 0; i < block_height; i++) { + for (j = 0; j < block_width; j++, k++) { + int pixel_value = *frame2; + + // non-local mean approach + int diff_sse[9] = { 0 }; + int idx, idy, index = 0; + + for (idy = -1; idy <= 1; ++idy) { + for (idx = -1; idx <= 1; ++idx) { + int row = (int)i + idy; + int col = (int)j + idx; + + if (row >= 0 && row < (int)block_height && col >= 0 && + col < (int)block_width) { + int diff = frame1[byte + idy * (int)stride + idx] - + frame2[idy * (int)block_width + idx]; + diff_sse[index] = diff * diff; + ++index; + } + } + } + + assert(index > 0); + + modifier = 0; + for (idx = 0; idx < 9; ++idx) modifier += diff_sse[idx]; + + modifier *= 3; + modifier /= index; + + ++frame2; + + modifier += rounding; + modifier >>= strength; + + if (modifier > 16) modifier = 16; + + modifier = 16 - modifier; + modifier *= filter_weight; + + count[k] += modifier; + accumulator[k] += modifier * pixel_value; + + byte++; + } + + byte += stride - block_width; + } +} + +#if CONFIG_HIGHBITDEPTH +void av1_highbd_temporal_filter_apply_c( + uint8_t *frame1_8, unsigned int stride, uint8_t *frame2_8, + unsigned int block_width, unsigned int block_height, int strength, + int filter_weight, unsigned int *accumulator, uint16_t *count) { + uint16_t *frame1 = CONVERT_TO_SHORTPTR(frame1_8); + uint16_t *frame2 = CONVERT_TO_SHORTPTR(frame2_8); + unsigned int i, j, k; + int modifier; + int byte = 0; + const int rounding = strength > 0 ? 1 << (strength - 1) : 0; + + for (i = 0, k = 0; i < block_height; i++) { + for (j = 0; j < block_width; j++, k++) { + int pixel_value = *frame2; + + // non-local mean approach + int diff_sse[9] = { 0 }; + int idx, idy, index = 0; + + for (idy = -1; idy <= 1; ++idy) { + for (idx = -1; idx <= 1; ++idx) { + int row = (int)i + idy; + int col = (int)j + idx; + + if (row >= 0 && row < (int)block_height && col >= 0 && + col < (int)block_width) { + int diff = frame1[byte + idy * (int)stride + idx] - + frame2[idy * (int)block_width + idx]; + diff_sse[index] = diff * diff; + ++index; + } + } + } + + assert(index > 0); + + modifier = 0; + for (idx = 0; idx < 9; ++idx) modifier += diff_sse[idx]; + + modifier *= 3; + modifier /= index; + + ++frame2; + + modifier += rounding; + modifier >>= strength; + + if (modifier > 16) modifier = 16; + + modifier = 16 - modifier; + modifier *= filter_weight; + + count[k] += modifier; + accumulator[k] += modifier * pixel_value; + + byte++; + } + + byte += stride - block_width; + } +} +#endif // CONFIG_HIGHBITDEPTH + +static int temporal_filter_find_matching_mb_c(AV1_COMP *cpi, + uint8_t *arf_frame_buf, + uint8_t *frame_ptr_buf, + int stride) { + MACROBLOCK *const x = &cpi->td.mb; + MACROBLOCKD *const xd = &x->e_mbd; + const MV_SPEED_FEATURES *const mv_sf = &cpi->sf.mv; + int step_param; + int sadpb = x->sadperbit16; + int bestsme = INT_MAX; + int distortion; + unsigned int sse; + int cost_list[5]; + MvLimits tmp_mv_limits = x->mv_limits; + + MV best_ref_mv1 = { 0, 0 }; + MV best_ref_mv1_full; /* full-pixel value of best_ref_mv1 */ + + // Save input state + struct buf_2d src = x->plane[0].src; + struct buf_2d pre = xd->plane[0].pre[0]; + + best_ref_mv1_full.col = best_ref_mv1.col >> 3; + best_ref_mv1_full.row = best_ref_mv1.row >> 3; + + // Setup frame pointers + x->plane[0].src.buf = arf_frame_buf; + x->plane[0].src.stride = stride; + xd->plane[0].pre[0].buf = frame_ptr_buf; + xd->plane[0].pre[0].stride = stride; + + step_param = mv_sf->reduce_first_step_size; + step_param = AOMMIN(step_param, MAX_MVSEARCH_STEPS - 2); + + av1_set_mv_search_range(&x->mv_limits, &best_ref_mv1); + +#if CONFIG_REF_MV + x->mvcost = x->mv_cost_stack[0]; + x->nmvjointcost = x->nmv_vec_cost[0]; + x->mvsadcost = x->mvcost; + x->nmvjointsadcost = x->nmvjointcost; +#endif + + // Ignore mv costing by sending NULL pointer instead of cost arrays + av1_hex_search(x, &best_ref_mv1_full, step_param, sadpb, 1, + cond_cost_list(cpi, cost_list), &cpi->fn_ptr[BLOCK_16X16], 0, + &best_ref_mv1); + + x->mv_limits = tmp_mv_limits; + + // Ignore mv costing by sending NULL pointer instead of cost array + bestsme = cpi->find_fractional_mv_step( + x, &best_ref_mv1, cpi->common.allow_high_precision_mv, x->errorperbit, + &cpi->fn_ptr[BLOCK_16X16], 0, mv_sf->subpel_iters_per_step, + cond_cost_list(cpi, cost_list), NULL, NULL, &distortion, &sse, NULL, 0, 0, + 0); + + x->e_mbd.mi[0]->bmi[0].as_mv[0] = x->best_mv; + + // Restore input state + x->plane[0].src = src; + xd->plane[0].pre[0] = pre; + + return bestsme; +} + +static void temporal_filter_iterate_c(AV1_COMP *cpi, + YV12_BUFFER_CONFIG **frames, + int frame_count, int alt_ref_index, + int strength, + struct scale_factors *scale) { + int byte; + int frame; + int mb_col, mb_row; + unsigned int filter_weight; + int mb_cols = (frames[alt_ref_index]->y_crop_width + 15) >> 4; + int mb_rows = (frames[alt_ref_index]->y_crop_height + 15) >> 4; + int mb_y_offset = 0; + int mb_uv_offset = 0; + DECLARE_ALIGNED(16, unsigned int, accumulator[16 * 16 * 3]); + DECLARE_ALIGNED(16, uint16_t, count[16 * 16 * 3]); + MACROBLOCKD *mbd = &cpi->td.mb.e_mbd; + YV12_BUFFER_CONFIG *f = frames[alt_ref_index]; + uint8_t *dst1, *dst2; +#if CONFIG_HIGHBITDEPTH + DECLARE_ALIGNED(16, uint16_t, predictor16[16 * 16 * 3]); + DECLARE_ALIGNED(16, uint8_t, predictor8[16 * 16 * 3]); + uint8_t *predictor; +#else + DECLARE_ALIGNED(16, uint8_t, predictor[16 * 16 * 3]); +#endif + const int mb_uv_height = 16 >> mbd->plane[1].subsampling_y; + const int mb_uv_width = 16 >> mbd->plane[1].subsampling_x; + + // Save input state + uint8_t *input_buffer[MAX_MB_PLANE]; + int i; +#if CONFIG_HIGHBITDEPTH + if (mbd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) { + predictor = CONVERT_TO_BYTEPTR(predictor16); + } else { + predictor = predictor8; + } +#endif + + for (i = 0; i < MAX_MB_PLANE; i++) input_buffer[i] = mbd->plane[i].pre[0].buf; + + for (mb_row = 0; mb_row < mb_rows; mb_row++) { + // Source frames are extended to 16 pixels. This is different than + // L/A/G reference frames that have a border of 32 (AV1ENCBORDERINPIXELS) + // A 6/8 tap filter is used for motion search. This requires 2 pixels + // before and 3 pixels after. So the largest Y mv on a border would + // then be 16 - AOM_INTERP_EXTEND. The UV blocks are half the size of the + // Y and therefore only extended by 8. The largest mv that a UV block + // can support is 8 - AOM_INTERP_EXTEND. A UV mv is half of a Y mv. + // (16 - AOM_INTERP_EXTEND) >> 1 which is greater than + // 8 - AOM_INTERP_EXTEND. + // To keep the mv in play for both Y and UV planes the max that it + // can be on a border is therefore 16 - (2*AOM_INTERP_EXTEND+1). + cpi->td.mb.mv_limits.row_min = + -((mb_row * 16) + (17 - 2 * AOM_INTERP_EXTEND)); + cpi->td.mb.mv_limits.row_max = + ((mb_rows - 1 - mb_row) * 16) + (17 - 2 * AOM_INTERP_EXTEND); + + for (mb_col = 0; mb_col < mb_cols; mb_col++) { + int j, k; + int stride; + + memset(accumulator, 0, 16 * 16 * 3 * sizeof(accumulator[0])); + memset(count, 0, 16 * 16 * 3 * sizeof(count[0])); + + cpi->td.mb.mv_limits.col_min = + -((mb_col * 16) + (17 - 2 * AOM_INTERP_EXTEND)); + cpi->td.mb.mv_limits.col_max = + ((mb_cols - 1 - mb_col) * 16) + (17 - 2 * AOM_INTERP_EXTEND); + + for (frame = 0; frame < frame_count; frame++) { + const int thresh_low = 10000; + const int thresh_high = 20000; + + if (frames[frame] == NULL) continue; + + mbd->mi[0]->bmi[0].as_mv[0].as_mv.row = 0; + mbd->mi[0]->bmi[0].as_mv[0].as_mv.col = 0; + + if (frame == alt_ref_index) { + filter_weight = 2; + } else { + // Find best match in this frame by MC + int err = temporal_filter_find_matching_mb_c( + cpi, frames[alt_ref_index]->y_buffer + mb_y_offset, + frames[frame]->y_buffer + mb_y_offset, frames[frame]->y_stride); + + // Assign higher weight to matching MB if it's error + // score is lower. If not applying MC default behavior + // is to weight all MBs equal. + filter_weight = err < thresh_low ? 2 : err < thresh_high ? 1 : 0; + } + + if (filter_weight != 0) { + // Construct the predictors + temporal_filter_predictors_mb_c( + mbd, frames[frame]->y_buffer + mb_y_offset, + frames[frame]->u_buffer + mb_uv_offset, + frames[frame]->v_buffer + mb_uv_offset, frames[frame]->y_stride, + mb_uv_width, mb_uv_height, mbd->mi[0]->bmi[0].as_mv[0].as_mv.row, + mbd->mi[0]->bmi[0].as_mv[0].as_mv.col, predictor, scale, + mb_col * 16, mb_row * 16); + +#if CONFIG_HIGHBITDEPTH + if (mbd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) { + int adj_strength = strength + 2 * (mbd->bd - 8); + // Apply the filter (YUV) + av1_highbd_temporal_filter_apply( + f->y_buffer + mb_y_offset, f->y_stride, predictor, 16, 16, + adj_strength, filter_weight, accumulator, count); + av1_highbd_temporal_filter_apply( + f->u_buffer + mb_uv_offset, f->uv_stride, predictor + 256, + mb_uv_width, mb_uv_height, adj_strength, filter_weight, + accumulator + 256, count + 256); + av1_highbd_temporal_filter_apply( + f->v_buffer + mb_uv_offset, f->uv_stride, predictor + 512, + mb_uv_width, mb_uv_height, adj_strength, filter_weight, + accumulator + 512, count + 512); + } else { + // Apply the filter (YUV) + av1_temporal_filter_apply_c(f->y_buffer + mb_y_offset, f->y_stride, + predictor, 16, 16, strength, + filter_weight, accumulator, count); + av1_temporal_filter_apply_c( + f->u_buffer + mb_uv_offset, f->uv_stride, predictor + 256, + mb_uv_width, mb_uv_height, strength, filter_weight, + accumulator + 256, count + 256); + av1_temporal_filter_apply_c( + f->v_buffer + mb_uv_offset, f->uv_stride, predictor + 512, + mb_uv_width, mb_uv_height, strength, filter_weight, + accumulator + 512, count + 512); + } +#else + // Apply the filter (YUV) + av1_temporal_filter_apply_c(f->y_buffer + mb_y_offset, f->y_stride, + predictor, 16, 16, strength, + filter_weight, accumulator, count); + av1_temporal_filter_apply_c(f->u_buffer + mb_uv_offset, f->uv_stride, + predictor + 256, mb_uv_width, + mb_uv_height, strength, filter_weight, + accumulator + 256, count + 256); + av1_temporal_filter_apply_c(f->v_buffer + mb_uv_offset, f->uv_stride, + predictor + 512, mb_uv_width, + mb_uv_height, strength, filter_weight, + accumulator + 512, count + 512); +#endif // CONFIG_HIGHBITDEPTH + } + } + +#if CONFIG_HIGHBITDEPTH + if (mbd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) { + uint16_t *dst1_16; + uint16_t *dst2_16; + // Normalize filter output to produce AltRef frame + dst1 = cpi->alt_ref_buffer.y_buffer; + dst1_16 = CONVERT_TO_SHORTPTR(dst1); + stride = cpi->alt_ref_buffer.y_stride; + byte = mb_y_offset; + for (i = 0, k = 0; i < 16; i++) { + for (j = 0; j < 16; j++, k++) { + dst1_16[byte] = + (uint16_t)OD_DIVU(accumulator[k] + (count[k] >> 1), count[k]); + + // move to next pixel + byte++; + } + + byte += stride - 16; + } + + dst1 = cpi->alt_ref_buffer.u_buffer; + dst2 = cpi->alt_ref_buffer.v_buffer; + dst1_16 = CONVERT_TO_SHORTPTR(dst1); + dst2_16 = CONVERT_TO_SHORTPTR(dst2); + stride = cpi->alt_ref_buffer.uv_stride; + byte = mb_uv_offset; + for (i = 0, k = 256; i < mb_uv_height; i++) { + for (j = 0; j < mb_uv_width; j++, k++) { + int m = k + 256; + + // U + dst1_16[byte] = + (uint16_t)OD_DIVU(accumulator[k] + (count[k] >> 1), count[k]); + + // V + dst2_16[byte] = + (uint16_t)OD_DIVU(accumulator[m] + (count[m] >> 1), count[m]); + + // move to next pixel + byte++; + } + + byte += stride - mb_uv_width; + } + } else { + // Normalize filter output to produce AltRef frame + dst1 = cpi->alt_ref_buffer.y_buffer; + stride = cpi->alt_ref_buffer.y_stride; + byte = mb_y_offset; + for (i = 0, k = 0; i < 16; i++) { + for (j = 0; j < 16; j++, k++) { + dst1[byte] = + (uint8_t)OD_DIVU(accumulator[k] + (count[k] >> 1), count[k]); + + // move to next pixel + byte++; + } + byte += stride - 16; + } + + dst1 = cpi->alt_ref_buffer.u_buffer; + dst2 = cpi->alt_ref_buffer.v_buffer; + stride = cpi->alt_ref_buffer.uv_stride; + byte = mb_uv_offset; + for (i = 0, k = 256; i < mb_uv_height; i++) { + for (j = 0; j < mb_uv_width; j++, k++) { + int m = k + 256; + + // U + dst1[byte] = + (uint8_t)OD_DIVU(accumulator[k] + (count[k] >> 1), count[k]); + + // V + dst2[byte] = + (uint8_t)OD_DIVU(accumulator[m] + (count[m] >> 1), count[m]); + + // move to next pixel + byte++; + } + byte += stride - mb_uv_width; + } + } +#else + // Normalize filter output to produce AltRef frame + dst1 = cpi->alt_ref_buffer.y_buffer; + stride = cpi->alt_ref_buffer.y_stride; + byte = mb_y_offset; + for (i = 0, k = 0; i < 16; i++) { + for (j = 0; j < 16; j++, k++) { + dst1[byte] = + (uint8_t)OD_DIVU(accumulator[k] + (count[k] >> 1), count[k]); + + // move to next pixel + byte++; + } + byte += stride - 16; + } + + dst1 = cpi->alt_ref_buffer.u_buffer; + dst2 = cpi->alt_ref_buffer.v_buffer; + stride = cpi->alt_ref_buffer.uv_stride; + byte = mb_uv_offset; + for (i = 0, k = 256; i < mb_uv_height; i++) { + for (j = 0; j < mb_uv_width; j++, k++) { + int m = k + 256; + + // U + dst1[byte] = + (uint8_t)OD_DIVU(accumulator[k] + (count[k] >> 1), count[k]); + + // V + dst2[byte] = + (uint8_t)OD_DIVU(accumulator[m] + (count[m] >> 1), count[m]); + + // move to next pixel + byte++; + } + byte += stride - mb_uv_width; + } +#endif // CONFIG_HIGHBITDEPTH + mb_y_offset += 16; + mb_uv_offset += mb_uv_width; + } + mb_y_offset += 16 * (f->y_stride - mb_cols); + mb_uv_offset += mb_uv_height * f->uv_stride - mb_uv_width * mb_cols; + } + + // Restore input state + for (i = 0; i < MAX_MB_PLANE; i++) mbd->plane[i].pre[0].buf = input_buffer[i]; +} + +// Apply buffer limits and context specific adjustments to arnr filter. +static void adjust_arnr_filter(AV1_COMP *cpi, int distance, int group_boost, + int *arnr_frames, int *arnr_strength) { + const AV1EncoderConfig *const oxcf = &cpi->oxcf; + const int frames_after_arf = + av1_lookahead_depth(cpi->lookahead) - distance - 1; + int frames_fwd = (cpi->oxcf.arnr_max_frames - 1) >> 1; + int frames_bwd; + int q, frames, strength; + + // Define the forward and backwards filter limits for this arnr group. + if (frames_fwd > frames_after_arf) frames_fwd = frames_after_arf; + if (frames_fwd > distance) frames_fwd = distance; + + frames_bwd = frames_fwd; + + // For even length filter there is one more frame backward + // than forward: e.g. len=6 ==> bbbAff, len=7 ==> bbbAfff. + if (frames_bwd < distance) frames_bwd += (oxcf->arnr_max_frames + 1) & 0x1; + + // Set the baseline active filter size. + frames = frames_bwd + 1 + frames_fwd; + + // Adjust the strength based on active max q. + if (cpi->common.current_video_frame > 1) + q = ((int)av1_convert_qindex_to_q(cpi->rc.avg_frame_qindex[INTER_FRAME], + cpi->common.bit_depth)); + else + q = ((int)av1_convert_qindex_to_q(cpi->rc.avg_frame_qindex[KEY_FRAME], + cpi->common.bit_depth)); + if (q > 16) { + strength = oxcf->arnr_strength; + } else { + strength = oxcf->arnr_strength - ((16 - q) / 2); + if (strength < 0) strength = 0; + } + + // Adjust number of frames in filter and strength based on gf boost level. + if (frames > group_boost / 150) { + frames = group_boost / 150; + frames += !(frames & 1); + } + + if (strength > group_boost / 300) { + strength = group_boost / 300; + } + + // Adjustments for second level arf in multi arf case. + if (cpi->oxcf.pass == 2 && cpi->multi_arf_allowed) { + const GF_GROUP *const gf_group = &cpi->twopass.gf_group; + if (gf_group->rf_level[gf_group->index] != GF_ARF_STD) { + strength >>= 1; + } + } + + *arnr_frames = frames; + *arnr_strength = strength; +} + +void av1_temporal_filter(AV1_COMP *cpi, int distance) { + RATE_CONTROL *const rc = &cpi->rc; + int frame; + int frames_to_blur; + int start_frame; + int strength; + int frames_to_blur_backward; + int frames_to_blur_forward; + struct scale_factors sf; + YV12_BUFFER_CONFIG *frames[MAX_LAG_BUFFERS] = { NULL }; +#if CONFIG_EXT_REFS + const GF_GROUP *const gf_group = &cpi->twopass.gf_group; +#endif + + // Apply context specific adjustments to the arnr filter parameters. + adjust_arnr_filter(cpi, distance, rc->gfu_boost, &frames_to_blur, &strength); +// TODO(weitinglin): Currently, we enforce the filtering strength on +// extra ARFs' to be zeros. We should investigate in which +// case it is more beneficial to use non-zero strength +// filtering. +#if CONFIG_EXT_REFS + if (gf_group->rf_level[gf_group->index] == GF_ARF_LOW) { + strength = 0; + frames_to_blur = 1; + } +#endif + +#if CONFIG_EXT_REFS + if (strength == 0 && frames_to_blur == 1) { + cpi->is_arf_filter_off[gf_group->arf_update_idx[gf_group->index]] = 1; + } else { + cpi->is_arf_filter_off[gf_group->arf_update_idx[gf_group->index]] = 0; + } +#endif + + frames_to_blur_backward = (frames_to_blur / 2); + frames_to_blur_forward = ((frames_to_blur - 1) / 2); + start_frame = distance + frames_to_blur_forward; + + // Setup frame pointers, NULL indicates frame not included in filter. + for (frame = 0; frame < frames_to_blur; ++frame) { + const int which_buffer = start_frame - frame; + struct lookahead_entry *buf = + av1_lookahead_peek(cpi->lookahead, which_buffer); + frames[frames_to_blur - 1 - frame] = &buf->img; + } + + if (frames_to_blur > 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. +#if CONFIG_HIGHBITDEPTH + 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, + cpi->common.use_highbitdepth); +#else + 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); +#endif // CONFIG_HIGHBITDEPTH + } + + temporal_filter_iterate_c(cpi, frames, frames_to_blur, + frames_to_blur_backward, strength, &sf); +} |