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Diffstat (limited to 'third_party/aom/av1/encoder/pvq_encoder.c')
| -rw-r--r-- | third_party/aom/av1/encoder/pvq_encoder.c | 988 |
1 files changed, 0 insertions, 988 deletions
diff --git a/third_party/aom/av1/encoder/pvq_encoder.c b/third_party/aom/av1/encoder/pvq_encoder.c deleted file mode 100644 index 9d5133012..000000000 --- a/third_party/aom/av1/encoder/pvq_encoder.c +++ /dev/null @@ -1,988 +0,0 @@ -/* - * Copyright (c) 2001-2016, 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. - */ - -/* clang-format off */ - -#ifdef HAVE_CONFIG_H -# include "config.h" -#endif - -#include <math.h> -#include <stdio.h> -#include <stdlib.h> -#include "aom_dsp/entcode.h" -#include "aom_dsp/entenc.h" -#include "av1/common/blockd.h" -#include "av1/common/odintrin.h" -#include "av1/common/partition.h" -#include "av1/common/pvq_state.h" -#include "av1/encoder/encodemb.h" -#include "av1/encoder/pvq_encoder.h" -#include "aom_ports/system_state.h" - -/*Shift to ensure that the upper bound (i.e. for the max blocksize) of the - dot-product of the 1st band of chroma with the luma ref doesn't overflow.*/ -#define OD_CFL_FLIP_SHIFT (OD_LIMIT_BSIZE_MAX + 0) - -void aom_write_symbol_pvq(aom_writer *w, int symb, aom_cdf_prob *cdf, - int nsymbs) { - if (cdf[0] == 0) - aom_cdf_init_q15_1D(cdf, nsymbs, CDF_SIZE(nsymbs)); - aom_write_symbol(w, symb, cdf, nsymbs); -} - -static void aom_encode_pvq_codeword(aom_writer *w, od_pvq_codeword_ctx *adapt, - const od_coeff *in, int n, int k) { - int i; - aom_encode_band_pvq_splits(w, adapt, in, n, k, 0); - for (i = 0; i < n; i++) if (in[i]) aom_write_bit(w, in[i] < 0); -} - -/* Computes 1/sqrt(i) using a table for small values. */ -static double od_rsqrt_table(int i) { - static double table[16] = { - 1.000000, 0.707107, 0.577350, 0.500000, - 0.447214, 0.408248, 0.377964, 0.353553, - 0.333333, 0.316228, 0.301511, 0.288675, - 0.277350, 0.267261, 0.258199, 0.250000}; - if (i <= 16) return table[i-1]; - else return 1./sqrt(i); -} - -/*Computes 1/sqrt(start+2*i+1) using a lookup table containing the results - where 0 <= i < table_size.*/ -static double od_custom_rsqrt_dynamic_table(const double* table, - const int table_size, const double start, const int i) { - if (i < table_size) return table[i]; - else return od_rsqrt_table((int)(start + 2*i + 1)); -} - -/*Fills tables used in od_custom_rsqrt_dynamic_table for a given start.*/ -static void od_fill_dynamic_rsqrt_table(double *table, const int table_size, - const double start) { - int i; - for (i = 0; i < table_size; i++) - table[i] = od_rsqrt_table((int)(start + 2*i + 1)); -} - -/** Find the codepoint on the given PSphere closest to the desired - * vector. Double-precision PVQ search just to make sure our tests - * aren't limited by numerical accuracy. - * - * @param [in] xcoeff input vector to quantize (x in the math doc) - * @param [in] n number of dimensions - * @param [in] k number of pulses - * @param [out] ypulse optimal codevector found (y in the math doc) - * @param [out] g2 multiplier for the distortion (typically squared - * gain units) - * @param [in] pvq_norm_lambda enc->pvq_norm_lambda for quantized RDO - * @param [in] prev_k number of pulses already in ypulse that we should - * reuse for the search (or 0 for a new search) - * @return cosine distance between x and y (between 0 and 1) - */ -double pvq_search_rdo_double_c(const od_val16 *xcoeff, int n, int k, - od_coeff *ypulse, double g2, double pvq_norm_lambda, int prev_k) { - int i, j; - double xy; - double yy; - /* TODO - This blows our 8kB stack space budget and should be fixed when - converting PVQ to fixed point. */ - double x[MAXN]; - double xx; - double lambda; - double norm_1; - int rdo_pulses; - double delta_rate; - xx = xy = yy = 0; - for (j = 0; j < n; j++) { - x[j] = fabs((float)xcoeff[j]); - xx += x[j]*x[j]; - } - norm_1 = 1./sqrt(1e-30 + xx); - lambda = pvq_norm_lambda/(1e-30 + g2); - i = 0; - if (prev_k > 0 && prev_k <= k) { - /* We reuse pulses from a previous search so we don't have to search them - again. */ - for (j = 0; j < n; j++) { - ypulse[j] = abs(ypulse[j]); - xy += x[j]*ypulse[j]; - yy += ypulse[j]*ypulse[j]; - i += ypulse[j]; - } - } - else if (k > 2) { - double l1_norm; - double l1_inv; - l1_norm = 0; - for (j = 0; j < n; j++) l1_norm += x[j]; - l1_inv = 1./OD_MAXF(l1_norm, 1e-100); - for (j = 0; j < n; j++) { - double tmp; - tmp = k*x[j]*l1_inv; - ypulse[j] = OD_MAXI(0, (int)floor(tmp)); - xy += x[j]*ypulse[j]; - yy += ypulse[j]*ypulse[j]; - i += ypulse[j]; - } - } - else OD_CLEAR(ypulse, n); - - /* Only use RDO on the last few pulses. This not only saves CPU, but using - RDO on all pulses actually makes the results worse for reasons I don't - fully understand. */ - rdo_pulses = 1 + k/4; - /* Rough assumption for now, the last position costs about 3 bits more than - the first. */ - delta_rate = 3./n; - /* Search one pulse at a time */ - for (; i < k - rdo_pulses; i++) { - int pos; - double best_xy; - double best_yy; - pos = 0; - best_xy = -10; - best_yy = 1; - for (j = 0; j < n; j++) { - double tmp_xy; - double tmp_yy; - tmp_xy = xy + x[j]; - tmp_yy = yy + 2*ypulse[j] + 1; - tmp_xy *= tmp_xy; - if (j == 0 || tmp_xy*best_yy > best_xy*tmp_yy) { - best_xy = tmp_xy; - best_yy = tmp_yy; - pos = j; - } - } - xy = xy + x[pos]; - yy = yy + 2*ypulse[pos] + 1; - ypulse[pos]++; - } - /* Search last pulses with RDO. Distortion is D = (x-y)^2 = x^2 - 2*x*y + y^2 - and since x^2 and y^2 are constant, we just maximize x*y, plus a - lambda*rate term. Note that since x and y aren't normalized here, - we need to divide by sqrt(x^2)*sqrt(y^2). */ - for (; i < k; i++) { - double rsqrt_table[4]; - int rsqrt_table_size = 4; - int pos; - double best_cost; - pos = 0; - best_cost = -1e5; - /*Fill the small rsqrt lookup table with inputs relative to yy. - Specifically, the table of n values is filled with - rsqrt(yy + 1), rsqrt(yy + 2 + 1) .. rsqrt(yy + 2*(n-1) + 1).*/ - od_fill_dynamic_rsqrt_table(rsqrt_table, rsqrt_table_size, yy); - for (j = 0; j < n; j++) { - double tmp_xy; - double tmp_yy; - tmp_xy = xy + x[j]; - /*Calculate rsqrt(yy + 2*ypulse[j] + 1) using an optimized method.*/ - tmp_yy = od_custom_rsqrt_dynamic_table(rsqrt_table, rsqrt_table_size, - yy, ypulse[j]); - tmp_xy = 2*tmp_xy*norm_1*tmp_yy - lambda*j*delta_rate; - if (j == 0 || tmp_xy > best_cost) { - best_cost = tmp_xy; - pos = j; - } - } - xy = xy + x[pos]; - yy = yy + 2*ypulse[pos] + 1; - ypulse[pos]++; - } - for (i = 0; i < n; i++) { - if (xcoeff[i] < 0) ypulse[i] = -ypulse[i]; - } - return xy/(1e-100 + sqrt(xx*yy)); -} - -/** Encodes the gain so that the return value increases with the - * distance |x-ref|, so that we can encode a zero when x=ref. The - * value x=0 is not covered because it is only allowed in the noref - * case. - * - * @param [in] x quantized gain to encode - * @param [in] ref quantized gain of the reference - * @return interleave-encoded quantized gain value - */ -static int neg_interleave(int x, int ref) { - if (x < ref) return -2*(x - ref) - 1; - else if (x < 2*ref) return 2*(x - ref); - else return x-1; -} - -int od_vector_is_null(const od_coeff *x, int len) { - int i; - for (i = 0; i < len; i++) if (x[i]) return 0; - return 1; -} - -static double od_pvq_rate(int qg, int icgr, int theta, int ts, - const od_adapt_ctx *adapt, const od_coeff *y0, int k, int n, int speed) { - double rate; - if (k == 0) rate = 0; - else if (speed > 0) { - int i; - int sum; - double f; - /* Compute "center of mass" of the pulse vector. */ - sum = 0; - for (i = 0; i < n - (theta != -1); i++) sum += i*abs(y0[i]); - f = sum/(double)(k*n); - /* Estimates the number of bits it will cost to encode K pulses in - N dimensions based on hand-tuned fit for bitrate vs K, N and - "center of mass". */ - rate = (1 + .4*f)*n*OD_LOG2(1 + OD_MAXF(0, log(n*2*(1*f + .025))*k/n)) + 3; - } - else { - aom_writer w; - od_pvq_codeword_ctx cd; - int tell; -#if !CONFIG_ANS - od_ec_enc_init(&w.ec, 1000); -#else -# error "CONFIG_PVQ currently requires !CONFIG_ANS." -#endif - OD_COPY(&cd, &adapt->pvq.pvq_codeword_ctx, 1); -#if !CONFIG_ANS - tell = od_ec_enc_tell_frac(&w.ec); -#else -# error "CONFIG_PVQ currently requires !CONFIG_ANS." -#endif - aom_encode_pvq_codeword(&w, &cd, y0, n - (theta != -1), k); -#if !CONFIG_ANS - rate = (od_ec_enc_tell_frac(&w.ec)-tell)/8.; - od_ec_enc_clear(&w.ec); -#else -# error "CONFIG_PVQ currently requires !CONFIG_ANS." -#endif - } - if (qg > 0 && theta >= 0) { - /* Approximate cost of entropy-coding theta */ - rate += .9*OD_LOG2(ts); - if (qg == icgr) rate -= .5; - } - return rate; -} - -#define MAX_PVQ_ITEMS (20) -/* This stores the information about a PVQ search candidate, so we can sort - based on K. */ -typedef struct { - int gain; - int k; - od_val32 qtheta; - int theta; - int ts; - od_val32 qcg; -} pvq_search_item; - -int items_compare(pvq_search_item *a, pvq_search_item *b) { - /* Break ties in K with gain to ensure a stable sort. - Otherwise, the order depends on qsort implementation. */ - return a->k == b->k ? a->gain - b->gain : a->k - b->k; -} - -/** Perform PVQ quantization with prediction, trying several - * possible gains and angles. See draft-valin-videocodec-pvq and - * http://jmvalin.ca/slides/pvq.pdf for more details. - * - * @param [out] out coefficients after quantization - * @param [in] x0 coefficients before quantization - * @param [in] r0 reference, aka predicted coefficients - * @param [in] n number of dimensions - * @param [in] q0 quantization step size - * @param [out] y pulse vector (i.e. selected PVQ codevector) - * @param [out] itheta angle between input and reference (-1 if noref) - * @param [out] vk total number of pulses - * @param [in] beta per-band activity masking beta param - * @param [out] skip_diff distortion cost of skipping this block - * (accumulated) - * @param [in] is_keyframe whether we're encoding a keyframe - * @param [in] pli plane index - * @param [in] adapt probability adaptation context - * @param [in] qm QM with magnitude compensation - * @param [in] qm_inv Inverse of QM with magnitude compensation - * @param [in] pvq_norm_lambda enc->pvq_norm_lambda for quantized RDO - * @param [in] speed Make search faster by making approximations - * @return gain index of the quatized gain -*/ -static int pvq_theta(od_coeff *out, const od_coeff *x0, const od_coeff *r0, - int n, int q0, od_coeff *y, int *itheta, int *vk, - od_val16 beta, double *skip_diff, int is_keyframe, int pli, - const od_adapt_ctx *adapt, const int16_t *qm, const int16_t *qm_inv, - double pvq_norm_lambda, int speed) { - od_val32 g; - od_val32 gr; - od_coeff y_tmp[MAXN + 3]; - int i; - /* Number of pulses. */ - int k; - /* Companded gain of x and reference, normalized to q. */ - od_val32 cg; - od_val32 cgr; - int icgr; - int qg; - /* Best RDO cost (D + lamdba*R) so far. */ - double best_cost; - double dist0; - /* Distortion (D) that corresponds to the best RDO cost. */ - double best_dist; - double dist; - /* Sign of Householder reflection. */ - int s; - /* Dimension on which Householder reflects. */ - int m; - od_val32 theta; - double corr; - int best_k; - od_val32 best_qtheta; - od_val32 gain_offset; - int noref; - double skip_dist; - int cfl_enabled; - int skip; - double gain_weight; - od_val16 x16[MAXN]; - od_val16 r16[MAXN]; - int xshift; - int rshift; - /* Give more weight to gain error when calculating the total distortion. */ - gain_weight = 1.0; - OD_ASSERT(n > 1); - corr = 0; -#if !defined(OD_FLOAT_PVQ) - /* Shift needed to make x fit in 16 bits even after rotation. - This shift value is not normative (it can be changed without breaking - the bitstream) */ - xshift = OD_MAXI(0, od_vector_log_mag(x0, n) - 15); - /* Shift needed to make the reference fit in 15 bits, so that the Householder - vector can fit in 16 bits. - This shift value *is* normative, and has to match the decoder. */ - rshift = OD_MAXI(0, od_vector_log_mag(r0, n) - 14); -#else - xshift = 0; - rshift = 0; -#endif - for (i = 0; i < n; i++) { -#if defined(OD_FLOAT_PVQ) - /*This is slightly different from the original float PVQ code, - where the qm was applied in the accumulation in od_pvq_compute_gain and - the vectors were od_coeffs, not od_val16 (i.e. double).*/ - x16[i] = x0[i]*(double)qm[i]*OD_QM_SCALE_1; - r16[i] = r0[i]*(double)qm[i]*OD_QM_SCALE_1; -#else - x16[i] = OD_SHR_ROUND(x0[i]*qm[i], OD_QM_SHIFT + xshift); - r16[i] = OD_SHR_ROUND(r0[i]*qm[i], OD_QM_SHIFT + rshift); -#endif - corr += OD_MULT16_16(x16[i], r16[i]); - } - cfl_enabled = is_keyframe && pli != 0 && !OD_DISABLE_CFL; - cg = od_pvq_compute_gain(x16, n, q0, &g, beta, xshift); - cgr = od_pvq_compute_gain(r16, n, q0, &gr, beta, rshift); - if (cfl_enabled) cgr = OD_CGAIN_SCALE; - /* gain_offset is meant to make sure one of the quantized gains has - exactly the same gain as the reference. */ -#if defined(OD_FLOAT_PVQ) - icgr = (int)floor(.5 + cgr); -#else - icgr = OD_SHR_ROUND(cgr, OD_CGAIN_SHIFT); -#endif - gain_offset = cgr - OD_SHL(icgr, OD_CGAIN_SHIFT); - /* Start search with null case: gain=0, no pulse. */ - qg = 0; - dist = gain_weight*cg*cg*OD_CGAIN_SCALE_2; - best_dist = dist; - best_cost = dist + pvq_norm_lambda*od_pvq_rate(0, 0, -1, 0, adapt, NULL, 0, - n, speed); - noref = 1; - best_k = 0; - *itheta = -1; - OD_CLEAR(y, n); - best_qtheta = 0; - m = 0; - s = 1; - corr = corr/(1e-100 + g*(double)gr/OD_SHL(1, xshift + rshift)); - corr = OD_MAXF(OD_MINF(corr, 1.), -1.); - if (is_keyframe) skip_dist = gain_weight*cg*cg*OD_CGAIN_SCALE_2; - else { - skip_dist = gain_weight*(cg - cgr)*(cg - cgr) - + cgr*(double)cg*(2 - 2*corr); - skip_dist *= OD_CGAIN_SCALE_2; - } - if (!is_keyframe) { - /* noref, gain=0 isn't allowed, but skip is allowed. */ - od_val32 scgr; - scgr = OD_MAXF(0,gain_offset); - if (icgr == 0) { - best_dist = gain_weight*(cg - scgr)*(cg - scgr) - + scgr*(double)cg*(2 - 2*corr); - best_dist *= OD_CGAIN_SCALE_2; - } - best_cost = best_dist + pvq_norm_lambda*od_pvq_rate(0, icgr, 0, 0, adapt, - NULL, 0, n, speed); - best_qtheta = 0; - *itheta = 0; - noref = 0; - } - dist0 = best_dist; - if (n <= OD_MAX_PVQ_SIZE && !od_vector_is_null(r0, n) && corr > 0) { - od_val16 xr[MAXN]; - int gain_bound; - int prev_k; - pvq_search_item items[MAX_PVQ_ITEMS]; - int idx; - int nitems; - double cos_dist; - idx = 0; - gain_bound = OD_SHR(cg - gain_offset, OD_CGAIN_SHIFT); - /* Perform theta search only if prediction is useful. */ - theta = OD_ROUND32(OD_THETA_SCALE*acos(corr)); - m = od_compute_householder(r16, n, gr, &s, rshift); - od_apply_householder(xr, x16, r16, n); - prev_k = 0; - for (i = m; i < n - 1; i++) xr[i] = xr[i + 1]; - /* Compute all candidate PVQ searches within a reasonable range of gain - and theta. */ - for (i = OD_MAXI(1, gain_bound - 1); i <= gain_bound + 1; i++) { - int j; - od_val32 qcg; - int ts; - int theta_lower; - int theta_upper; - /* Quantized companded gain */ - qcg = OD_SHL(i, OD_CGAIN_SHIFT) + gain_offset; - /* Set angular resolution (in ra) to match the encoded gain */ - ts = od_pvq_compute_max_theta(qcg, beta); - theta_lower = OD_MAXI(0, (int)floor(.5 + - theta*OD_THETA_SCALE_1*2/M_PI*ts) - 2); - theta_upper = OD_MINI(ts - 1, (int)ceil(theta*OD_THETA_SCALE_1*2/M_PI*ts)); - /* Include the angles within a reasonable range. */ - for (j = theta_lower; j <= theta_upper; j++) { - od_val32 qtheta; - qtheta = od_pvq_compute_theta(j, ts); - k = od_pvq_compute_k(qcg, j, 0, n, beta); - items[idx].gain = i; - items[idx].theta = j; - items[idx].k = k; - items[idx].qcg = qcg; - items[idx].qtheta = qtheta; - items[idx].ts = ts; - idx++; - OD_ASSERT(idx < MAX_PVQ_ITEMS); - } - } - nitems = idx; - cos_dist = 0; - /* Sort PVQ search candidates in ascending order of pulses K so that - we can reuse all the previously searched pulses across searches. */ - qsort(items, nitems, sizeof(items[0]), - (int (*)(const void *, const void *))items_compare); - /* Search for the best gain/theta in order. */ - for (idx = 0; idx < nitems; idx++) { - int j; - od_val32 qcg; - int ts; - double cost; - double dist_theta; - double sin_prod; - od_val32 qtheta; - /* Quantized companded gain */ - qcg = items[idx].qcg; - i = items[idx].gain; - j = items[idx].theta; - /* Set angular resolution (in ra) to match the encoded gain */ - ts = items[idx].ts; - /* Search for the best angle within a reasonable range. */ - qtheta = items[idx].qtheta; - k = items[idx].k; - /* Compute the minimal possible distortion by not taking the PVQ - cos_dist into account. */ - dist_theta = 2 - 2.*od_pvq_cos(theta - qtheta)*OD_TRIG_SCALE_1; - dist = gain_weight*(qcg - cg)*(qcg - cg) + qcg*(double)cg*dist_theta; - dist *= OD_CGAIN_SCALE_2; - /* If we have no hope of beating skip (including a 1-bit worst-case - penalty), stop now. */ - if (dist > dist0 + 1.0*pvq_norm_lambda && k != 0) continue; - sin_prod = od_pvq_sin(theta)*OD_TRIG_SCALE_1*od_pvq_sin(qtheta)* - OD_TRIG_SCALE_1; - /* PVQ search, using a gain of qcg*cg*sin(theta)*sin(qtheta) since - that's the factor by which cos_dist is multiplied to get the - distortion metric. */ - if (k == 0) { - cos_dist = 0; - OD_CLEAR(y_tmp, n-1); - } - else if (k != prev_k) { - cos_dist = pvq_search_rdo_double(xr, n - 1, k, y_tmp, - qcg*(double)cg*sin_prod*OD_CGAIN_SCALE_2, pvq_norm_lambda, prev_k); - } - prev_k = k; - /* See Jmspeex' Journal of Dubious Theoretical Results. */ - dist_theta = 2 - 2.*od_pvq_cos(theta - qtheta)*OD_TRIG_SCALE_1 - + sin_prod*(2 - 2*cos_dist); - dist = gain_weight*(qcg - cg)*(qcg - cg) + qcg*(double)cg*dist_theta; - dist *= OD_CGAIN_SCALE_2; - /* Do approximate RDO. */ - cost = dist + pvq_norm_lambda*od_pvq_rate(i, icgr, j, ts, adapt, y_tmp, - k, n, speed); - if (cost < best_cost) { - best_cost = cost; - best_dist = dist; - qg = i; - best_k = k; - best_qtheta = qtheta; - *itheta = j; - noref = 0; - OD_COPY(y, y_tmp, n - 1); - } - } - } - /* Don't bother with no-reference version if there's a reasonable - correlation. */ - if (n <= OD_MAX_PVQ_SIZE && (corr < .5 - || cg < (od_val32)(OD_SHL(2, OD_CGAIN_SHIFT)))) { - int gain_bound; - int prev_k; - gain_bound = OD_SHR(cg, OD_CGAIN_SHIFT); - prev_k = 0; - /* Search for the best gain (haven't determined reasonable range yet). */ - for (i = OD_MAXI(1, gain_bound); i <= gain_bound + 1; i++) { - double cos_dist; - double cost; - od_val32 qcg; - qcg = OD_SHL(i, OD_CGAIN_SHIFT); - k = od_pvq_compute_k(qcg, -1, 1, n, beta); - /* Compute the minimal possible distortion by not taking the PVQ - cos_dist into account. */ - dist = gain_weight*(qcg - cg)*(qcg - cg); - dist *= OD_CGAIN_SCALE_2; - if (dist > dist0 && k != 0) continue; - cos_dist = pvq_search_rdo_double(x16, n, k, y_tmp, - qcg*(double)cg*OD_CGAIN_SCALE_2, pvq_norm_lambda, prev_k); - prev_k = k; - /* See Jmspeex' Journal of Dubious Theoretical Results. */ - dist = gain_weight*(qcg - cg)*(qcg - cg) - + qcg*(double)cg*(2 - 2*cos_dist); - dist *= OD_CGAIN_SCALE_2; - /* Do approximate RDO. */ - cost = dist + pvq_norm_lambda*od_pvq_rate(i, 0, -1, 0, adapt, y_tmp, k, - n, speed); - if (cost <= best_cost) { - best_cost = cost; - best_dist = dist; - qg = i; - noref = 1; - best_k = k; - *itheta = -1; - OD_COPY(y, y_tmp, n); - } - } - } - k = best_k; - theta = best_qtheta; - skip = 0; - if (noref) { - if (qg == 0) skip = OD_PVQ_SKIP_ZERO; - } - else { - if (!is_keyframe && qg == 0) { - skip = (icgr ? OD_PVQ_SKIP_ZERO : OD_PVQ_SKIP_COPY); - } - if (qg == icgr && *itheta == 0 && !cfl_enabled) skip = OD_PVQ_SKIP_COPY; - } - /* Synthesize like the decoder would. */ - if (skip) { - if (skip == OD_PVQ_SKIP_COPY) OD_COPY(out, r0, n); - else OD_CLEAR(out, n); - } - else { - if (noref) gain_offset = 0; - g = od_gain_expand(OD_SHL(qg, OD_CGAIN_SHIFT) + gain_offset, q0, beta); - od_pvq_synthesis_partial(out, y, r16, n, noref, g, theta, m, s, - qm_inv); - } - *vk = k; - *skip_diff += skip_dist - best_dist; - /* Encode gain differently depending on whether we use prediction or not. - Special encoding on inter frames where qg=0 is allowed for noref=0 - but not noref=1.*/ - if (is_keyframe) return noref ? qg : neg_interleave(qg, icgr); - else return noref ? qg - 1 : neg_interleave(qg + 1, icgr + 1); -} - -/** Encodes a single vector of integers (eg, a partition within a - * coefficient block) using PVQ - * - * @param [in,out] w multi-symbol entropy encoder - * @param [in] qg quantized gain - * @param [in] theta quantized post-prediction theta - * @param [in] in coefficient vector to code - * @param [in] n number of coefficients in partition - * @param [in] k number of pulses in partition - * @param [in,out] model entropy encoder state - * @param [in,out] adapt adaptation context - * @param [in,out] exg ExQ16 expectation of gain value - * @param [in,out] ext ExQ16 expectation of theta value - * @param [in] cdf_ctx selects which cdf context to use - * @param [in] is_keyframe whether we're encoding a keyframe - * @param [in] code_skip whether the "skip rest" flag is allowed - * @param [in] skip_rest when set, we skip all higher bands - * @param [in] encode_flip whether we need to encode the CfL flip flag now - * @param [in] flip value of the CfL flip flag - */ -void pvq_encode_partition(aom_writer *w, - int qg, - int theta, - const od_coeff *in, - int n, - int k, - generic_encoder model[3], - od_adapt_ctx *adapt, - int *exg, - int *ext, - int cdf_ctx, - int is_keyframe, - int code_skip, - int skip_rest, - int encode_flip, - int flip) { - int noref; - int id; - noref = (theta == -1); - id = (qg > 0) + 2*OD_MINI(theta + 1,3) + 8*code_skip*skip_rest; - if (is_keyframe) { - OD_ASSERT(id != 8); - if (id >= 8) id--; - } - else { - OD_ASSERT(id != 10); - if (id >= 10) id--; - } - /* Jointly code gain, theta and noref for small values. Then we handle - larger gain and theta values. For noref, theta = -1. */ - aom_write_symbol_pvq(w, id, &adapt->pvq.pvq_gaintheta_cdf[cdf_ctx][0], - 8 + 7*code_skip); - if (encode_flip) { - /* We could eventually do some smarter entropy coding here, but it would - have to be good enough to overcome the overhead of the entropy coder. - An early attempt using a "toogle" flag with simple adaptation wasn't - worth the trouble. */ - aom_write_bit(w, flip); - } - if (qg > 0) { - int tmp; - tmp = *exg; - generic_encode(w, &model[!noref], qg - 1, &tmp, 2); - OD_IIR_DIADIC(*exg, qg << 16, 2); - } - if (theta > 1) { - int tmp; - tmp = *ext; - generic_encode(w, &model[2], theta - 2, &tmp, 2); - OD_IIR_DIADIC(*ext, theta << 16, 2); - } - aom_encode_pvq_codeword(w, &adapt->pvq.pvq_codeword_ctx, in, - n - (theta != -1), k); -} - -/** Quantizes a scalar with rate-distortion optimization (RDO) - * @param [in] x unquantized value - * @param [in] q quantization step size - * @param [in] delta0 rate increase for encoding a 1 instead of a 0 - * @param [in] pvq_norm_lambda enc->pvq_norm_lambda for quantized RDO - * @retval quantized value - */ -int od_rdo_quant(od_coeff x, int q, double delta0, double pvq_norm_lambda) { - int n; - /* Optimal quantization threshold is 1/2 + lambda*delta_rate/2. See - Jmspeex' Journal of Dubious Theoretical Results for details. */ - n = OD_DIV_R0(abs(x), q); - if ((double)abs(x)/q < (double)n/2 + pvq_norm_lambda*delta0/(2*n)) { - return 0; - } - else { - return OD_DIV_R0(x, q); - } -} - -/** Encode a coefficient block (excepting DC) using PVQ - * - * @param [in,out] enc daala encoder context - * @param [in] ref 'reference' (prediction) vector - * @param [in] in coefficient block to quantize and encode - * @param [out] out quantized coefficient block - * @param [in] q0 scale/quantizer - * @param [in] pli plane index - * @param [in] bs log of the block size minus two - * @param [in] beta per-band activity masking beta param - * @param [in] is_keyframe whether we're encoding a keyframe - * @param [in] qm QM with magnitude compensation - * @param [in] qm_inv Inverse of QM with magnitude compensation - * @param [in] speed Make search faster by making approximations - * @param [in] pvq_info If null, conisdered as RDO search mode - * @return Returns block skip info indicating whether DC/AC are coded. - * bit0: DC is coded, bit1: AC is coded (1 means coded) - * - */ -PVQ_SKIP_TYPE od_pvq_encode(daala_enc_ctx *enc, - od_coeff *ref, - const od_coeff *in, - od_coeff *out, - int q_dc, - int q_ac, - int pli, - int bs, - const od_val16 *beta, - int is_keyframe, - const int16_t *qm, - const int16_t *qm_inv, - int speed, - PVQ_INFO *pvq_info){ - int theta[PVQ_MAX_PARTITIONS]; - int qg[PVQ_MAX_PARTITIONS]; - int k[PVQ_MAX_PARTITIONS]; - od_coeff y[OD_TXSIZE_MAX*OD_TXSIZE_MAX]; - int *exg; - int *ext; - int nb_bands; - int i; - const int *off; - int size[PVQ_MAX_PARTITIONS]; - generic_encoder *model; - double skip_diff; - int tell; - uint16_t *skip_cdf; - od_rollback_buffer buf; - int dc_quant; - int flip; - int cfl_encoded; - int skip_rest; - int skip_dir; - int skip_theta_value; - const unsigned char *pvq_qm; - double dc_rate; - int use_masking; - PVQ_SKIP_TYPE ac_dc_coded; - - aom_clear_system_state(); - - use_masking = enc->use_activity_masking; - - if (use_masking) - pvq_qm = &enc->state.pvq_qm_q4[pli][0]; - else - pvq_qm = 0; - - exg = &enc->state.adapt->pvq.pvq_exg[pli][bs][0]; - ext = enc->state.adapt->pvq.pvq_ext + bs*PVQ_MAX_PARTITIONS; - skip_cdf = enc->state.adapt->skip_cdf[2*bs + (pli != 0)]; - model = enc->state.adapt->pvq.pvq_param_model; - nb_bands = OD_BAND_OFFSETS[bs][0]; - off = &OD_BAND_OFFSETS[bs][1]; - - if (use_masking) - dc_quant = OD_MAXI(1, q_dc * pvq_qm[od_qm_get_index(bs, 0)] >> 4); - else - dc_quant = OD_MAXI(1, q_dc); - - tell = 0; - for (i = 0; i < nb_bands; i++) size[i] = off[i+1] - off[i]; - skip_diff = 0; - flip = 0; - /*If we are coding a chroma block of a keyframe, we are doing CfL.*/ - if (pli != 0 && is_keyframe) { - od_val32 xy; - xy = 0; - /*Compute the dot-product of the first band of chroma with the luma ref.*/ - for (i = off[0]; i < off[1]; i++) { -#if defined(OD_FLOAT_PVQ) - xy += ref[i]*(double)qm[i]*OD_QM_SCALE_1* - (double)in[i]*(double)qm[i]*OD_QM_SCALE_1; -#else - od_val32 rq; - od_val32 inq; - rq = ref[i]*qm[i]; - inq = in[i]*qm[i]; - xy += OD_SHR(rq*(int64_t)inq, OD_SHL(OD_QM_SHIFT + OD_CFL_FLIP_SHIFT, - 1)); -#endif - } - /*If cos(theta) < 0, then |theta| > pi/2 and we should negate the ref.*/ - if (xy < 0) { - flip = 1; - for(i = off[0]; i < off[nb_bands]; i++) ref[i] = -ref[i]; - } - } - for (i = 0; i < nb_bands; i++) { - int q; - - if (use_masking) - q = OD_MAXI(1, q_ac * pvq_qm[od_qm_get_index(bs, i + 1)] >> 4); - else - q = OD_MAXI(1, q_ac); - - qg[i] = pvq_theta(out + off[i], in + off[i], ref + off[i], size[i], - q, y + off[i], &theta[i], &k[i], beta[i], &skip_diff, is_keyframe, - pli, enc->state.adapt, qm + off[i], qm_inv + off[i], - enc->pvq_norm_lambda, speed); - } - od_encode_checkpoint(enc, &buf); - if (is_keyframe) out[0] = 0; - else { - int n; - n = OD_DIV_R0(abs(in[0] - ref[0]), dc_quant); - if (n == 0) { - out[0] = 0; - } else { - int tell2; - od_rollback_buffer dc_buf; - - dc_rate = -OD_LOG2((double)(OD_ICDF(skip_cdf[3]) - OD_ICDF(skip_cdf[2]))/ - (double)(OD_ICDF(skip_cdf[2]) - OD_ICDF(skip_cdf[1]))); - dc_rate += 1; - -#if !CONFIG_ANS - tell2 = od_ec_enc_tell_frac(&enc->w.ec); -#else -#error "CONFIG_PVQ currently requires !CONFIG_ANS." -#endif - od_encode_checkpoint(enc, &dc_buf); - generic_encode(&enc->w, &enc->state.adapt->model_dc[pli], - n - 1, &enc->state.adapt->ex_dc[pli][bs][0], 2); -#if !CONFIG_ANS - tell2 = od_ec_enc_tell_frac(&enc->w.ec) - tell2; -#else -#error "CONFIG_PVQ currently requires !CONFIG_ANS." -#endif - dc_rate += tell2/8.0; - od_encode_rollback(enc, &dc_buf); - - out[0] = od_rdo_quant(in[0] - ref[0], dc_quant, dc_rate, - enc->pvq_norm_lambda); - } - } -#if !CONFIG_ANS - tell = od_ec_enc_tell_frac(&enc->w.ec); -#else -#error "CONFIG_PVQ currently requires !CONFIG_ANS." -#endif - /* Code as if we're not skipping. */ - aom_write_symbol(&enc->w, 2 + (out[0] != 0), skip_cdf, 4); - ac_dc_coded = AC_CODED + (out[0] != 0); - cfl_encoded = 0; - skip_rest = 1; - skip_theta_value = is_keyframe ? -1 : 0; - for (i = 1; i < nb_bands; i++) { - if (theta[i] != skip_theta_value || qg[i]) skip_rest = 0; - } - skip_dir = 0; - if (nb_bands > 1) { - for (i = 0; i < 3; i++) { - int j; - int tmp; - tmp = 1; - // ToDo(yaowu): figure out better stop condition without gcc warning. - for (j = i + 1; j < nb_bands && j < PVQ_MAX_PARTITIONS; j += 3) { - if (theta[j] != skip_theta_value || qg[j]) tmp = 0; - } - skip_dir |= tmp << i; - } - } - if (theta[0] == skip_theta_value && qg[0] == 0 && skip_rest) nb_bands = 0; - - /* NOTE: There was no other better place to put this function. */ - if (pvq_info) - av1_store_pvq_enc_info(pvq_info, qg, theta, k, y, nb_bands, off, size, - skip_rest, skip_dir, bs); - - for (i = 0; i < nb_bands; i++) { - int encode_flip; - /* Encode CFL flip bit just after the first time it's used. */ - encode_flip = pli != 0 && is_keyframe && theta[i] != -1 && !cfl_encoded; - if (i == 0 || (!skip_rest && !(skip_dir & (1 << ((i - 1)%3))))) { - pvq_encode_partition(&enc->w, qg[i], theta[i], y + off[i], - size[i], k[i], model, enc->state.adapt, exg + i, ext + i, - (pli != 0)*OD_TXSIZES*PVQ_MAX_PARTITIONS + bs*PVQ_MAX_PARTITIONS + i, - is_keyframe, i == 0 && (i < nb_bands - 1), skip_rest, encode_flip, flip); - } - if (i == 0 && !skip_rest && bs > 0) { - aom_write_symbol(&enc->w, skip_dir, - &enc->state.adapt->pvq.pvq_skip_dir_cdf[(pli != 0) + 2*(bs - 1)][0], 7); - } - if (encode_flip) cfl_encoded = 1; - } -#if !CONFIG_ANS - tell = od_ec_enc_tell_frac(&enc->w.ec) - tell; -#else -#error "CONFIG_PVQ currently requires !CONFIG_ANS." -#endif - /* Account for the rate of skipping the AC, based on the same DC decision - we made when trying to not skip AC. */ - { - double skip_rate; - if (out[0] != 0) { - skip_rate = -OD_LOG2((OD_ICDF(skip_cdf[1]) - OD_ICDF(skip_cdf[0]))/ - (double)OD_ICDF(skip_cdf[3])); - } - else { - skip_rate = -OD_LOG2(OD_ICDF(skip_cdf[0])/ - (double)OD_ICDF(skip_cdf[3])); - } - tell -= (int)floor(.5+8*skip_rate); - } - if (nb_bands == 0 || skip_diff <= enc->pvq_norm_lambda/8*tell) { - if (is_keyframe) out[0] = 0; - else { - int n; - n = OD_DIV_R0(abs(in[0] - ref[0]), dc_quant); - if (n == 0) { - out[0] = 0; - } else { - int tell2; - od_rollback_buffer dc_buf; - - dc_rate = -OD_LOG2((double)(OD_ICDF(skip_cdf[1]) - OD_ICDF(skip_cdf[0]))/ - (double)OD_ICDF(skip_cdf[0])); - dc_rate += 1; - -#if !CONFIG_ANS - tell2 = od_ec_enc_tell_frac(&enc->w.ec); -#else -#error "CONFIG_PVQ currently requires !CONFIG_ANS." -#endif - od_encode_checkpoint(enc, &dc_buf); - generic_encode(&enc->w, &enc->state.adapt->model_dc[pli], - n - 1, &enc->state.adapt->ex_dc[pli][bs][0], 2); -#if !CONFIG_ANS - tell2 = od_ec_enc_tell_frac(&enc->w.ec) - tell2; -#else -#error "CONFIG_PVQ currently requires !CONFIG_ANS." -#endif - dc_rate += tell2/8.0; - od_encode_rollback(enc, &dc_buf); - - out[0] = od_rdo_quant(in[0] - ref[0], dc_quant, dc_rate, - enc->pvq_norm_lambda); - } - } - /* We decide to skip, roll back everything as it was before. */ - od_encode_rollback(enc, &buf); - aom_write_symbol(&enc->w, out[0] != 0, skip_cdf, 4); - ac_dc_coded = (out[0] != 0); - if (is_keyframe) for (i = 1; i < 1 << (2*bs + 4); i++) out[i] = 0; - else for (i = 1; i < 1 << (2*bs + 4); i++) out[i] = ref[i]; - } - if (pvq_info) - pvq_info->ac_dc_coded = ac_dc_coded; - return ac_dc_coded; -} |