| /* |
| * 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 <assert.h> |
| #include <limits.h> |
| |
| #include "config/aom_scale_rtcd.h" |
| |
| #include "aom_dsp/aom_dsp_common.h" |
| #include "aom_dsp/psnr.h" |
| #include "aom_mem/aom_mem.h" |
| #include "aom_ports/mem.h" |
| |
| #include "av1/common/av1_loopfilter.h" |
| #include "av1/common/onyxc_int.h" |
| #include "av1/common/quant_common.h" |
| |
| #include "av1/encoder/av1_quantize.h" |
| #include "av1/encoder/encoder.h" |
| #include "av1/encoder/picklpf.h" |
| |
| static void yv12_copy_plane(const YV12_BUFFER_CONFIG *src_bc, |
| YV12_BUFFER_CONFIG *dst_bc, int plane) { |
| switch (plane) { |
| case 0: aom_yv12_copy_y(src_bc, dst_bc); break; |
| case 1: aom_yv12_copy_u(src_bc, dst_bc); break; |
| case 2: aom_yv12_copy_v(src_bc, dst_bc); break; |
| default: assert(plane >= 0 && plane <= 2); break; |
| } |
| } |
| |
| int av1_get_max_filter_level(const AV1_COMP *cpi) { |
| if (cpi->oxcf.pass == 2) { |
| return cpi->twopass.section_intra_rating > 8 ? MAX_LOOP_FILTER * 3 / 4 |
| : MAX_LOOP_FILTER; |
| } else { |
| return MAX_LOOP_FILTER; |
| } |
| } |
| |
| static int64_t try_filter_frame(const YV12_BUFFER_CONFIG *sd, |
| AV1_COMP *const cpi, int filt_level, |
| int partial_frame, int plane, int dir) { |
| AV1_COMMON *const cm = &cpi->common; |
| int64_t filt_err; |
| |
| assert(plane >= 0 && plane <= 2); |
| int filter_level[2] = { filt_level, filt_level }; |
| if (plane == 0 && dir == 0) filter_level[1] = cm->lf.filter_level[1]; |
| if (plane == 0 && dir == 1) filter_level[0] = cm->lf.filter_level[0]; |
| |
| // set base filters for use of get_filter_level when in DELTA_Q_LF mode |
| switch (plane) { |
| case 0: |
| cm->lf.filter_level[0] = filter_level[0]; |
| cm->lf.filter_level[1] = filter_level[1]; |
| break; |
| case 1: cm->lf.filter_level_u = filter_level[0]; break; |
| case 2: cm->lf.filter_level_v = filter_level[0]; break; |
| } |
| |
| // TODO(any): please enable multi-thread and remove the flag when loop |
| // filter mask is compatible with multi-thread. |
| if (cpi->num_workers > 1) |
| av1_loop_filter_frame_mt(cm->frame_to_show, cm, &cpi->td.mb.e_mbd, plane, |
| plane + 1, partial_frame, |
| #if LOOP_FILTER_BITMASK |
| 0, |
| #endif |
| cpi->workers, cpi->num_workers, &cpi->lf_row_sync); |
| else |
| av1_loop_filter_frame(cm->frame_to_show, cm, &cpi->td.mb.e_mbd, |
| #if LOOP_FILTER_BITMASK |
| 0, |
| #endif |
| plane, plane + 1, partial_frame); |
| |
| filt_err = aom_get_sse_plane(sd, cm->frame_to_show, plane, |
| cm->seq_params.use_highbitdepth); |
| |
| // Re-instate the unfiltered frame |
| yv12_copy_plane(&cpi->last_frame_uf, cm->frame_to_show, plane); |
| |
| return filt_err; |
| } |
| |
| static int search_filter_level(const YV12_BUFFER_CONFIG *sd, AV1_COMP *cpi, |
| int partial_frame, |
| const int *last_frame_filter_level, |
| double *best_cost_ret, int plane, int dir) { |
| const AV1_COMMON *const cm = &cpi->common; |
| const int min_filter_level = 0; |
| const int max_filter_level = av1_get_max_filter_level(cpi); |
| int filt_direction = 0; |
| int64_t best_err; |
| int filt_best; |
| MACROBLOCK *x = &cpi->td.mb; |
| |
| // Start the search at the previous frame filter level unless it is now out of |
| // range. |
| int lvl; |
| switch (plane) { |
| case 0: lvl = last_frame_filter_level[dir]; break; |
| case 1: lvl = last_frame_filter_level[2]; break; |
| case 2: lvl = last_frame_filter_level[3]; break; |
| default: assert(plane >= 0 && plane <= 2); return 0; |
| } |
| int filt_mid = clamp(lvl, min_filter_level, max_filter_level); |
| int filter_step = filt_mid < 16 ? 4 : filt_mid / 4; |
| // Sum squared error at each filter level |
| int64_t ss_err[MAX_LOOP_FILTER + 1]; |
| |
| // Set each entry to -1 |
| memset(ss_err, 0xFF, sizeof(ss_err)); |
| yv12_copy_plane(cm->frame_to_show, &cpi->last_frame_uf, plane); |
| best_err = try_filter_frame(sd, cpi, filt_mid, partial_frame, plane, dir); |
| filt_best = filt_mid; |
| ss_err[filt_mid] = best_err; |
| |
| while (filter_step > 0) { |
| const int filt_high = AOMMIN(filt_mid + filter_step, max_filter_level); |
| const int filt_low = AOMMAX(filt_mid - filter_step, min_filter_level); |
| |
| // Bias against raising loop filter in favor of lowering it. |
| int64_t bias = (best_err >> (15 - (filt_mid / 8))) * filter_step; |
| |
| if ((cpi->oxcf.pass == 2) && (cpi->twopass.section_intra_rating < 20)) |
| bias = (bias * cpi->twopass.section_intra_rating) / 20; |
| |
| // yx, bias less for large block size |
| if (cm->tx_mode != ONLY_4X4) bias >>= 1; |
| |
| if (filt_direction <= 0 && filt_low != filt_mid) { |
| // Get Low filter error score |
| if (ss_err[filt_low] < 0) { |
| ss_err[filt_low] = |
| try_filter_frame(sd, cpi, filt_low, partial_frame, plane, dir); |
| } |
| // If value is close to the best so far then bias towards a lower loop |
| // filter value. |
| if (ss_err[filt_low] < (best_err + bias)) { |
| // Was it actually better than the previous best? |
| if (ss_err[filt_low] < best_err) { |
| best_err = ss_err[filt_low]; |
| } |
| filt_best = filt_low; |
| } |
| } |
| |
| // Now look at filt_high |
| if (filt_direction >= 0 && filt_high != filt_mid) { |
| if (ss_err[filt_high] < 0) { |
| ss_err[filt_high] = |
| try_filter_frame(sd, cpi, filt_high, partial_frame, plane, dir); |
| } |
| // If value is significantly better than previous best, bias added against |
| // raising filter value |
| if (ss_err[filt_high] < (best_err - bias)) { |
| best_err = ss_err[filt_high]; |
| filt_best = filt_high; |
| } |
| } |
| |
| // Half the step distance if the best filter value was the same as last time |
| if (filt_best == filt_mid) { |
| filter_step /= 2; |
| filt_direction = 0; |
| } else { |
| filt_direction = (filt_best < filt_mid) ? -1 : 1; |
| filt_mid = filt_best; |
| } |
| } |
| |
| // Update best error |
| best_err = ss_err[filt_best]; |
| |
| if (best_cost_ret) *best_cost_ret = RDCOST_DBL(x->rdmult, 0, best_err); |
| return filt_best; |
| } |
| |
| void av1_pick_filter_level(const YV12_BUFFER_CONFIG *sd, AV1_COMP *cpi, |
| LPF_PICK_METHOD method) { |
| AV1_COMMON *const cm = &cpi->common; |
| const int num_planes = av1_num_planes(cm); |
| struct loopfilter *const lf = &cm->lf; |
| (void)sd; |
| |
| lf->sharpness_level = 0; |
| cpi->td.mb.rdmult = cpi->rd.RDMULT; |
| |
| if (method == LPF_PICK_MINIMAL_LPF) { |
| lf->filter_level[0] = 0; |
| lf->filter_level[1] = 0; |
| } else if (method >= LPF_PICK_FROM_Q) { |
| const int min_filter_level = 0; |
| const int max_filter_level = av1_get_max_filter_level(cpi); |
| const int q = av1_ac_quant_Q3(cm->base_qindex, 0, cm->seq_params.bit_depth); |
| // These values were determined by linear fitting the result of the |
| // searched level for 8 bit depth: |
| // Keyframes: filt_guess = q * 0.06699 - 1.60817 |
| // Other frames: filt_guess = q * 0.02295 + 2.48225 |
| // |
| // And high bit depth separately: |
| // filt_guess = q * 0.316206 + 3.87252 |
| int filt_guess; |
| switch (cm->seq_params.bit_depth) { |
| case AOM_BITS_8: |
| filt_guess = (cm->current_frame.frame_type == KEY_FRAME) |
| ? ROUND_POWER_OF_TWO(q * 17563 - 421574, 18) |
| : ROUND_POWER_OF_TWO(q * 6017 + 650707, 18); |
| break; |
| case AOM_BITS_10: |
| filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 4060632, 20); |
| break; |
| case AOM_BITS_12: |
| filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 16242526, 22); |
| break; |
| default: |
| assert(0 && |
| "bit_depth should be AOM_BITS_8, AOM_BITS_10 " |
| "or AOM_BITS_12"); |
| return; |
| } |
| if (cm->seq_params.bit_depth != AOM_BITS_8 && |
| cm->current_frame.frame_type == KEY_FRAME) |
| filt_guess -= 4; |
| // TODO(chengchen): retrain the model for Y, U, V filter levels |
| lf->filter_level[0] = clamp(filt_guess, min_filter_level, max_filter_level); |
| lf->filter_level[1] = clamp(filt_guess, min_filter_level, max_filter_level); |
| lf->filter_level_u = clamp(filt_guess, min_filter_level, max_filter_level); |
| lf->filter_level_v = clamp(filt_guess, min_filter_level, max_filter_level); |
| } else { |
| const int last_frame_filter_level[4] = { lf->filter_level[0], |
| lf->filter_level[1], |
| lf->filter_level_u, |
| lf->filter_level_v }; |
| |
| lf->filter_level[0] = lf->filter_level[1] = |
| search_filter_level(sd, cpi, method == LPF_PICK_FROM_SUBIMAGE, |
| last_frame_filter_level, NULL, 0, 2); |
| lf->filter_level[0] = |
| search_filter_level(sd, cpi, method == LPF_PICK_FROM_SUBIMAGE, |
| last_frame_filter_level, NULL, 0, 0); |
| lf->filter_level[1] = |
| search_filter_level(sd, cpi, method == LPF_PICK_FROM_SUBIMAGE, |
| last_frame_filter_level, NULL, 0, 1); |
| |
| if (num_planes > 1) { |
| lf->filter_level_u = |
| search_filter_level(sd, cpi, method == LPF_PICK_FROM_SUBIMAGE, |
| last_frame_filter_level, NULL, 1, 0); |
| lf->filter_level_v = |
| search_filter_level(sd, cpi, method == LPF_PICK_FROM_SUBIMAGE, |
| last_frame_filter_level, NULL, 2, 0); |
| } |
| } |
| } |
