| /* |
| * 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 "./aom_scale_rtcd.h" |
| |
| #include "aom_dsp/psnr.h" |
| #include "aom_dsp/aom_dsp_common.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 |
| #if CONFIG_LOOPFILTER_LEVEL |
| , |
| int plane, int dir |
| #endif |
| ) { |
| AV1_COMMON *const cm = &cpi->common; |
| int64_t filt_err; |
| |
| #if CONFIG_VAR_TX || CONFIG_EXT_PARTITION || CONFIG_CB4X4 |
| #if CONFIG_LOOPFILTER_LEVEL |
| 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]; |
| |
| av1_loop_filter_frame(cm->frame_to_show, cm, &cpi->td.mb.e_mbd, |
| filter_level[0], filter_level[1], plane, partial_frame); |
| #else |
| av1_loop_filter_frame(cm->frame_to_show, cm, &cpi->td.mb.e_mbd, filt_level, 1, |
| partial_frame); |
| #endif // CONFIG_LOOPFILTER_LEVEL |
| #else |
| if (cpi->num_workers > 1) |
| av1_loop_filter_frame_mt(cm->frame_to_show, cm, cpi->td.mb.e_mbd.plane, |
| filt_level, 1, partial_frame, cpi->workers, |
| cpi->num_workers, &cpi->lf_row_sync); |
| else |
| av1_loop_filter_frame(cm->frame_to_show, cm, &cpi->td.mb.e_mbd, filt_level, |
| 1, partial_frame); |
| #endif |
| |
| int highbd = 0; |
| #if CONFIG_HIGHBITDEPTH |
| highbd = cm->use_highbitdepth; |
| #endif // CONFIG_HIGHBITDEPTH |
| |
| #if CONFIG_LOOPFILTER_LEVEL |
| filt_err = aom_get_sse_plane(sd, cm->frame_to_show, plane, highbd); |
| |
| // Re-instate the unfiltered frame |
| yv12_copy_plane(&cpi->last_frame_uf, cm->frame_to_show, plane); |
| #else |
| filt_err = aom_get_sse_plane(sd, cm->frame_to_show, 0, highbd); |
| |
| // Re-instate the unfiltered frame |
| yv12_copy_plane(&cpi->last_frame_uf, cm->frame_to_show, 0); |
| #endif // CONFIG_LOOPFILTER_LEVEL |
| |
| return filt_err; |
| } |
| |
| static int search_filter_level(const YV12_BUFFER_CONFIG *sd, AV1_COMP *cpi, |
| int partial_frame, double *best_cost_ret |
| #if CONFIG_LOOPFILTER_LEVEL |
| , |
| int plane, int dir |
| #endif |
| ) { |
| const AV1_COMMON *const cm = &cpi->common; |
| const struct loopfilter *const lf = &cm->lf; |
| 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. |
| #if CONFIG_LOOPFILTER_LEVEL |
| int lvl; |
| switch (plane) { |
| case 0: lvl = (dir == 1) ? lf->filter_level[1] : lf->filter_level[0]; break; |
| case 1: lvl = lf->filter_level_u; break; |
| case 2: lvl = lf->filter_level_v; break; |
| default: assert(plane >= 0 && plane <= 2); return 0; |
| } |
| int filt_mid = clamp(lvl, min_filter_level, max_filter_level); |
| #else |
| int filt_mid = clamp(lf->filter_level, min_filter_level, max_filter_level); |
| #endif // CONFIG_LOOPFILTER_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)); |
| |
| #if CONFIG_LOOPFILTER_LEVEL |
| yv12_copy_plane(cm->frame_to_show, &cpi->last_frame_uf, plane); |
| #else |
| // Make a copy of the unfiltered / processed recon buffer |
| aom_yv12_copy_y(cm->frame_to_show, &cpi->last_frame_uf); |
| #endif // CONFIG_LOOPFILTER_LEVEL |
| |
| #if CONFIG_LOOPFILTER_LEVEL |
| best_err = try_filter_frame(sd, cpi, filt_mid, partial_frame, plane, dir); |
| #else |
| best_err = try_filter_frame(sd, cpi, filt_mid, partial_frame); |
| #endif // CONFIG_LOOPFILTER_LEVEL |
| 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) { |
| #if CONFIG_LOOPFILTER_LEVEL |
| ss_err[filt_low] = |
| try_filter_frame(sd, cpi, filt_low, partial_frame, plane, dir); |
| #else |
| ss_err[filt_low] = try_filter_frame(sd, cpi, filt_low, partial_frame); |
| #endif // CONFIG_LOOPFILTER_LEVEL |
| } |
| // 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) { |
| #if CONFIG_LOOPFILTER_LEVEL |
| ss_err[filt_high] = |
| try_filter_frame(sd, cpi, filt_high, partial_frame, plane, dir); |
| #else |
| ss_err[filt_high] = try_filter_frame(sd, cpi, filt_high, partial_frame); |
| #endif // CONFIG_LOOPFILTER_LEVEL |
| } |
| // 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; |
| struct loopfilter *const lf = &cm->lf; |
| |
| lf->sharpness_level = cm->frame_type == KEY_FRAME ? 0 : cpi->oxcf.sharpness; |
| |
| if (method == LPF_PICK_MINIMAL_LPF) { |
| #if CONFIG_LOOPFILTER_LEVEL |
| lf->filter_level[0] = 0; |
| lf->filter_level[1] = 0; |
| #else |
| lf->filter_level = 0; |
| #endif |
| } 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(cm->base_qindex, 0, cm->bit_depth); |
| // These values were determined by linear fitting the result of the |
| // searched level, filt_guess = q * 0.316206 + 3.87252 |
| #if CONFIG_HIGHBITDEPTH |
| int filt_guess; |
| switch (cm->bit_depth) { |
| case AOM_BITS_8: |
| filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 1015158, 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; |
| } |
| #else |
| int filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 1015158, 18); |
| #endif // CONFIG_HIGHBITDEPTH |
| if (cm->frame_type == KEY_FRAME) filt_guess -= 4; |
| #if CONFIG_LOOPFILTER_LEVEL |
| 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); |
| #else |
| lf->filter_level = clamp(filt_guess, min_filter_level, max_filter_level); |
| #endif |
| } else { |
| #if CONFIG_LOOPFILTER_LEVEL |
| lf->filter_level[0] = lf->filter_level[1] = search_filter_level( |
| sd, cpi, method == LPF_PICK_FROM_SUBIMAGE, NULL, 0, 2); |
| lf->filter_level[0] = search_filter_level( |
| sd, cpi, method == LPF_PICK_FROM_SUBIMAGE, NULL, 0, 0); |
| lf->filter_level[1] = search_filter_level( |
| sd, cpi, method == LPF_PICK_FROM_SUBIMAGE, NULL, 0, 1); |
| |
| lf->filter_level_u = search_filter_level( |
| sd, cpi, method == LPF_PICK_FROM_SUBIMAGE, NULL, 1, 0); |
| lf->filter_level_v = search_filter_level( |
| sd, cpi, method == LPF_PICK_FROM_SUBIMAGE, NULL, 2, 0); |
| #else |
| lf->filter_level = |
| search_filter_level(sd, cpi, method == LPF_PICK_FROM_SUBIMAGE, NULL); |
| #endif // CONFIG_LOOPFILTER_LEVEL |
| } |
| } |
