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-rw-r--r--third_party/aom/av1/encoder/picklpf.c263
1 files changed, 263 insertions, 0 deletions
diff --git a/third_party/aom/av1/encoder/picklpf.c b/third_party/aom/av1/encoder/picklpf.c
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+/*
+ * 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 LOOP_FILTER_BITMASK
+ av1_loop_filter_frame(cm->frame_to_show, cm, &cpi->td.mb.e_mbd, 0, plane,
+ plane + 1, partial_frame);
+#else
+ 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, cpi->workers,
+ cpi->num_workers, &cpi->lf_row_sync);
+ else
+ av1_loop_filter_frame(cm->frame_to_show, cm, &cpi->td.mb.e_mbd, plane,
+ plane + 1, partial_frame);
+#endif
+
+ 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->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->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);
+ }
+ }
+}
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