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uvg266/src/rdo.c
Pauli Oikkonen c3a6f3112a Add generic strategy group for encode_coding_tree
2018-12-18 19:41:09 +02:00

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/*****************************************************************************
* This file is part of Kvazaar HEVC encoder.
*
* Copyright (C) 2013-2015 Tampere University of Technology and others (see
* COPYING file).
*
* Kvazaar is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* Kvazaar is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with Kvazaar. If not, see <http://www.gnu.org/licenses/>.
****************************************************************************/
#include "rdo.h"
#include <stdlib.h>
#include <string.h>
#include "cabac.h"
#include "context.h"
#include "encode_coding_tree.h"
#include "encoder.h"
#include "imagelist.h"
#include "inter.h"
#include "scalinglist.h"
#include "strategyselector.h"
#include "tables.h"
#include "transform.h"
#include "strategies/strategies-quant.h"
#define QUANT_SHIFT 14
#define SCAN_SET_SIZE 16
#define LOG2_SCAN_SET_SIZE 4
#define SBH_THRESHOLD 4
static const double COEFF_COST_QP_FACTOR = 0.044407704;
static const double COEFF_COST_BIAS = 0.557323653;
const uint32_t kvz_g_go_rice_range[5] = { 7, 14, 26, 46, 78 };
const uint32_t kvz_g_go_rice_prefix_len[5] = { 8, 7, 6, 5, 4 };
/**
* Entropy bits to estimate coded bits in RDO / RDOQ (From HM 12.0)
*/
const uint32_t kvz_entropy_bits[128] =
{
0x08000, 0x08000, 0x076da, 0x089a0, 0x06e92, 0x09340, 0x0670a, 0x09cdf, 0x06029, 0x0a67f, 0x059dd, 0x0b01f, 0x05413, 0x0b9bf, 0x04ebf, 0x0c35f,
0x049d3, 0x0ccff, 0x04546, 0x0d69e, 0x0410d, 0x0e03e, 0x03d22, 0x0e9de, 0x0397d, 0x0f37e, 0x03619, 0x0fd1e, 0x032ee, 0x106be, 0x02ffa, 0x1105d,
0x02d37, 0x119fd, 0x02aa2, 0x1239d, 0x02836, 0x12d3d, 0x025f2, 0x136dd, 0x023d1, 0x1407c, 0x021d2, 0x14a1c, 0x01ff2, 0x153bc, 0x01e2f, 0x15d5c,
0x01c87, 0x166fc, 0x01af7, 0x1709b, 0x0197f, 0x17a3b, 0x0181d, 0x183db, 0x016d0, 0x18d7b, 0x01595, 0x1971b, 0x0146c, 0x1a0bb, 0x01354, 0x1aa5a,
0x0124c, 0x1b3fa, 0x01153, 0x1bd9a, 0x01067, 0x1c73a, 0x00f89, 0x1d0da, 0x00eb7, 0x1da79, 0x00df0, 0x1e419, 0x00d34, 0x1edb9, 0x00c82, 0x1f759,
0x00bda, 0x200f9, 0x00b3c, 0x20a99, 0x00aa5, 0x21438, 0x00a17, 0x21dd8, 0x00990, 0x22778, 0x00911, 0x23118, 0x00898, 0x23ab8, 0x00826, 0x24458,
0x007ba, 0x24df7, 0x00753, 0x25797, 0x006f2, 0x26137, 0x00696, 0x26ad7, 0x0063f, 0x27477, 0x005ed, 0x27e17, 0x0059f, 0x287b6, 0x00554, 0x29156,
0x0050e, 0x29af6, 0x004cc, 0x2a497, 0x0048d, 0x2ae35, 0x00451, 0x2b7d6, 0x00418, 0x2c176, 0x003e2, 0x2cb15, 0x003af, 0x2d4b5, 0x0037f, 0x2de55
};
// Entropy bits scaled so that 50% probability yields 1 bit.
const float kvz_f_entropy_bits[128] =
{
1.0, 1.0,
0.92852783203125, 1.0751953125,
0.86383056640625, 1.150390625,
0.80499267578125, 1.225555419921875,
0.751251220703125, 1.300750732421875,
0.702056884765625, 1.375946044921875,
0.656829833984375, 1.451141357421875,
0.615203857421875, 1.526336669921875,
0.576751708984375, 1.601531982421875,
0.54119873046875, 1.67669677734375,
0.508209228515625, 1.75189208984375,
0.47760009765625, 1.82708740234375,
0.449127197265625, 1.90228271484375,
0.422637939453125, 1.97747802734375,
0.39788818359375, 2.05267333984375,
0.37481689453125, 2.127838134765625,
0.353240966796875, 2.203033447265625,
0.33306884765625, 2.278228759765625,
0.31414794921875, 2.353424072265625,
0.29644775390625, 2.428619384765625,
0.279815673828125, 2.5037841796875,
0.26422119140625, 2.5789794921875,
0.24957275390625, 2.6541748046875,
0.235809326171875, 2.7293701171875,
0.222869873046875, 2.8045654296875,
0.210662841796875, 2.879730224609375,
0.199188232421875, 2.954925537109375,
0.188385009765625, 3.030120849609375,
0.17822265625, 3.105316162109375,
0.168609619140625, 3.180511474609375,
0.1595458984375, 3.255706787109375,
0.1510009765625, 3.33087158203125,
0.1429443359375, 3.40606689453125,
0.135345458984375, 3.48126220703125,
0.128143310546875, 3.55645751953125,
0.121368408203125, 3.63165283203125,
0.114959716796875, 3.706817626953125,
0.10888671875, 3.782012939453125,
0.1031494140625, 3.857208251953125,
0.09771728515625, 3.932403564453125,
0.09259033203125, 4.007598876953125,
0.0877685546875, 4.082794189453125,
0.083160400390625, 4.157958984375,
0.078826904296875, 4.233154296875,
0.07470703125, 4.308349609375,
0.070831298828125, 4.383544921875,
0.067138671875, 4.458740234375,
0.06365966796875, 4.533935546875,
0.06036376953125, 4.609100341796875,
0.057220458984375, 4.684295654296875,
0.05426025390625, 4.759490966796875,
0.05145263671875, 4.834686279296875,
0.048797607421875, 4.909881591796875,
0.046295166015625, 4.985076904296875,
0.043914794921875, 5.06024169921875,
0.0416259765625, 5.13543701171875,
0.03948974609375, 5.21063232421875,
0.0374755859375, 5.285858154296875,
0.035552978515625, 5.360992431640625,
0.033721923828125, 5.43621826171875,
0.031982421875, 5.51141357421875,
0.03033447265625, 5.586578369140625,
0.028778076171875, 5.661773681640625,
0.027313232421875, 5.736968994140625,
};
// This struct is for passing data to kvz_rdoq_sign_hiding
struct sh_rates_t {
// Bit cost of increasing rate by one.
int32_t inc[32 * 32];
// Bit cost of decreasing rate by one.
int32_t dec[32 * 32];
// Bit cost of going from zero to one.
int32_t sig_coeff_inc[32 * 32];
// Coeff minus quantized coeff.
int32_t quant_delta[32 * 32];
};
/**
* \brief Calculate actual (or really close to actual) bitcost for coding
* coefficients.
*
* \param coeff coefficient array
* \param width coeff block width
* \param type data type (0 == luma)
*
* \returns bits needed to code input coefficients
*/
static INLINE uint32_t get_coeff_cabac_cost(
const encoder_state_t * const state,
const coeff_t *coeff,
int32_t width,
int32_t type,
int8_t scan_mode)
{
// Make sure there are coeffs present
bool found = false;
for (int i = 0; i < width*width; i++) {
if (coeff[i] != 0) {
found = 1;
break;
}
}
if (!found) return 0;
// Take a copy of the CABAC so that we don't overwrite the contexts when
// counting the bits.
cabac_data_t cabac_copy;
memcpy(&cabac_copy, &state->cabac, sizeof(cabac_copy));
// Clear bytes and bits and set mode to "count"
cabac_copy.only_count = 1;
cabac_copy.num_buffered_bytes = 0;
cabac_copy.bits_left = 23;
// Execute the coding function.
// It is safe to drop the const modifier since state won't be modified
// when cabac.only_count is set.
kvz_encode_coeff_nxn((encoder_state_t*) state,
&cabac_copy,
coeff,
width,
type,
scan_mode,
0);
return (23 - cabac_copy.bits_left) + (cabac_copy.num_buffered_bytes << 3);
}
/**
* \brief Estimate bitcost for coding coefficients.
*
* \param coeff coefficient array
* \param width coeff block width
* \param type data type (0 == luma)
*
* \returns number of bits needed to code coefficients
*/
uint32_t kvz_get_coeff_cost(const encoder_state_t * const state,
const coeff_t *coeff,
int32_t width,
int32_t type,
int8_t scan_mode)
{
if (state->qp >= state->encoder_control->cfg.fast_residual_cost_limit) {
return get_coeff_cabac_cost(state, coeff, width, type, scan_mode);
} else {
// Estimate coeff coding cost based on QP and sum of absolute coeffs.
const uint32_t sum = kvz_coeff_abs_sum(coeff, width * width);
return (uint32_t)(sum * (state->qp * COEFF_COST_QP_FACTOR + COEFF_COST_BIAS) + 0.5);
}
}
#define COEF_REMAIN_BIN_REDUCTION 3
/** Calculates the cost for specific absolute transform level
* \param abs_level scaled quantized level
* \param ctx_num_one current ctxInc for coeff_abs_level_greater1 (1st bin of coeff_abs_level_minus1 in AVC)
* \param ctx_num_abs current ctxInc for coeff_abs_level_greater2 (remaining bins of coeff_abs_level_minus1 in AVC)
* \param abs_go_rice Rice parameter for coeff_abs_level_minus3
* \returns cost of given absolute transform level
* From HM 12.0
*/
INLINE int32_t kvz_get_ic_rate(encoder_state_t * const state,
uint32_t abs_level,
uint16_t ctx_num_one,
uint16_t ctx_num_abs,
uint16_t abs_go_rice,
uint32_t c1_idx,
uint32_t c2_idx,
int8_t type)
{
cabac_data_t * const cabac = &state->cabac;
int32_t rate = 1 << CTX_FRAC_BITS;
uint32_t base_level = (c1_idx < C1FLAG_NUMBER)? (2 + (c2_idx < C2FLAG_NUMBER)) : 1;
cabac_ctx_t *base_one_ctx = (type == 0) ? &(cabac->ctx.cu_one_model_luma[0]) : &(cabac->ctx.cu_one_model_chroma[0]);
cabac_ctx_t *base_abs_ctx = (type == 0) ? &(cabac->ctx.cu_abs_model_luma[0]) : &(cabac->ctx.cu_abs_model_chroma[0]);
if ( abs_level >= base_level ) {
int32_t symbol = abs_level - base_level;
int32_t length;
if (symbol < (COEF_REMAIN_BIN_REDUCTION << abs_go_rice)) {
length = symbol>>abs_go_rice;
rate += (length+1+abs_go_rice) * (1 << CTX_FRAC_BITS);
} else {
length = abs_go_rice;
symbol = symbol - ( COEF_REMAIN_BIN_REDUCTION << abs_go_rice);
while (symbol >= (1<<length)) {
symbol -= (1<<(length++));
}
rate += (COEF_REMAIN_BIN_REDUCTION+length+1-abs_go_rice+length) * (1 << CTX_FRAC_BITS);
}
if (c1_idx < C1FLAG_NUMBER) {
rate += CTX_ENTROPY_BITS(&base_one_ctx[ctx_num_one],1);
if (c2_idx < C2FLAG_NUMBER) {
rate += CTX_ENTROPY_BITS(&base_abs_ctx[ctx_num_abs],1);
}
}
}
else if( abs_level == 1 ) {
rate += CTX_ENTROPY_BITS(&base_one_ctx[ctx_num_one],0);
} else if( abs_level == 2 ) {
rate += CTX_ENTROPY_BITS(&base_one_ctx[ctx_num_one],1);
rate += CTX_ENTROPY_BITS(&base_abs_ctx[ctx_num_abs],0);
}
return rate;
}
/** Get the best level in RD sense
* \param coded_cost reference to coded cost
* \param coded_cost0 reference to cost when coefficient is 0
* \param coded_cost_sig reference to cost of significant coefficient
* \param level_double reference to unscaled quantized level
* \param max_abs_level scaled quantized level
* \param ctx_num_sig current ctxInc for coeff_abs_significant_flag
* \param ctx_num_one current ctxInc for coeff_abs_level_greater1 (1st bin of coeff_abs_level_minus1 in AVC)
* \param ctx_num_abs current ctxInc for coeff_abs_level_greater2 (remaining bins of coeff_abs_level_minus1 in AVC)
* \param abs_go_rice current Rice parameter for coeff_abs_level_minus3
* \param q_bits quantization step size
* \param temp correction factor
* \param last indicates if the coefficient is the last significant
* \returns best quantized transform level for given scan position
* This method calculates the best quantized transform level for a given scan position.
* From HM 12.0
*/
INLINE uint32_t kvz_get_coded_level ( encoder_state_t * const state, double *coded_cost, double *coded_cost0, double *coded_cost_sig,
int32_t level_double, uint32_t max_abs_level,
uint16_t ctx_num_sig, uint16_t ctx_num_one, uint16_t ctx_num_abs,
uint16_t abs_go_rice,
uint32_t c1_idx, uint32_t c2_idx,
int32_t q_bits,double temp, int8_t last, int8_t type)
{
cabac_data_t * const cabac = &state->cabac;
double cur_cost_sig = 0;
uint32_t best_abs_level = 0;
int32_t abs_level;
int32_t min_abs_level;
cabac_ctx_t* base_sig_model = type?(cabac->ctx.cu_sig_model_chroma):(cabac->ctx.cu_sig_model_luma);
if( !last && max_abs_level < 3 ) {
*coded_cost_sig = state->lambda * CTX_ENTROPY_BITS(&base_sig_model[ctx_num_sig], 0);
*coded_cost = *coded_cost0 + *coded_cost_sig;
if (max_abs_level == 0) return best_abs_level;
} else {
*coded_cost = MAX_DOUBLE;
}
if( !last ) {
cur_cost_sig = state->lambda * CTX_ENTROPY_BITS(&base_sig_model[ctx_num_sig], 1);
}
min_abs_level = ( max_abs_level > 1 ? max_abs_level - 1 : 1 );
for (abs_level = max_abs_level; abs_level >= min_abs_level ; abs_level-- ) {
double err = (double)(level_double - ( abs_level * (1 << q_bits) ) );
double cur_cost = err * err * temp + state->lambda *
kvz_get_ic_rate( state, abs_level, ctx_num_one, ctx_num_abs,
abs_go_rice, c1_idx, c2_idx, type);
cur_cost += cur_cost_sig;
if( cur_cost < *coded_cost ) {
best_abs_level = abs_level;
*coded_cost = cur_cost;
*coded_cost_sig = cur_cost_sig;
}
}
return best_abs_level;
}
/** Calculates the cost of signaling the last significant coefficient in the block
* \param pos_x X coordinate of the last significant coefficient
* \param pos_y Y coordinate of the last significant coefficient
* \returns cost of last significant coefficient
* \param uiWidth width of the transform unit (TU)
*
* From HM 12.0
*/
static double get_rate_last(const encoder_state_t * const state,
const uint32_t pos_x, const uint32_t pos_y,
int32_t* last_x_bits, int32_t* last_y_bits)
{
uint32_t ctx_x = g_group_idx[pos_x];
uint32_t ctx_y = g_group_idx[pos_y];
double uiCost = last_x_bits[ ctx_x ] + last_y_bits[ ctx_y ];
if( ctx_x > 3 ) {
uiCost += CTX_FRAC_ONE_BIT * ((ctx_x - 2) >> 1);
}
if( ctx_y > 3 ) {
uiCost += CTX_FRAC_ONE_BIT * ((ctx_y - 2) >> 1);
}
return state->lambda * uiCost;
}
static void calc_last_bits(encoder_state_t * const state, int32_t width, int32_t height, int8_t type,
int32_t* last_x_bits, int32_t* last_y_bits)
{
cabac_data_t * const cabac = &state->cabac;
int32_t bits_x = 0, bits_y = 0;
int32_t blk_size_offset_x, blk_size_offset_y, shiftX, shiftY;
int32_t ctx;
cabac_ctx_t *base_ctx_x = (type ? cabac->ctx.cu_ctx_last_x_chroma : cabac->ctx.cu_ctx_last_x_luma);
cabac_ctx_t *base_ctx_y = (type ? cabac->ctx.cu_ctx_last_y_chroma : cabac->ctx.cu_ctx_last_y_luma);
blk_size_offset_x = type ? 0: (kvz_g_convert_to_bit[ width ] *3 + ((kvz_g_convert_to_bit[ width ] +1)>>2));
blk_size_offset_y = type ? 0: (kvz_g_convert_to_bit[ height ]*3 + ((kvz_g_convert_to_bit[ height ]+1)>>2));
shiftX = type ? kvz_g_convert_to_bit[ width ] :((kvz_g_convert_to_bit[ width ]+3)>>2);
shiftY = type ? kvz_g_convert_to_bit[ height ] :((kvz_g_convert_to_bit[ height ]+3)>>2);
for (ctx = 0; ctx < g_group_idx[ width - 1 ]; ctx++) {
int32_t ctx_offset = blk_size_offset_x + (ctx >>shiftX);
last_x_bits[ ctx ] = bits_x + CTX_ENTROPY_BITS(&base_ctx_x[ ctx_offset ],0);
bits_x += CTX_ENTROPY_BITS(&base_ctx_x[ ctx_offset ],1);
}
last_x_bits[ctx] = bits_x;
for (ctx = 0; ctx < g_group_idx[ height - 1 ]; ctx++) {
int32_t ctx_offset = blk_size_offset_y + (ctx >>shiftY);
last_y_bits[ ctx ] = bits_y + CTX_ENTROPY_BITS(&base_ctx_y[ ctx_offset ],0);
bits_y += CTX_ENTROPY_BITS(&base_ctx_y[ ctx_offset ],1);
}
last_y_bits[ctx] = bits_y;
}
/**
* \brief Select which coefficient to change for sign hiding, and change it.
*
* When sign hiding is enabled, the last sign bit of the last coefficient is
* calculated from the parity of the other coefficients. If the parity is not
* correct, one coefficient has to be changed by one. This function uses
* tables generated during RDOQ to select the best coefficient to change.
*/
void kvz_rdoq_sign_hiding(
const encoder_state_t *const state,
const int32_t qp_scaled,
const uint32_t *const scan2raster,
const struct sh_rates_t *const sh_rates,
const int32_t last_pos,
const coeff_t *const coeffs,
coeff_t *const quant_coeffs)
{
const encoder_control_t * const ctrl = state->encoder_control;
int inv_quant = kvz_g_inv_quant_scales[qp_scaled % 6];
// This somehow scales quant_delta into fractional bits. Instead of the bits
// being multiplied by lambda, the residual is divided by it, or something
// like that.
const int64_t rd_factor = (inv_quant * inv_quant * (1 << (2 * (qp_scaled / 6)))
/ state->lambda / 16 / (1 << (2 * (ctrl->bitdepth - 8))) + 0.5);
const int last_cg = (last_pos - 1) >> LOG2_SCAN_SET_SIZE;
for (int32_t cg_scan = last_cg; cg_scan >= 0; cg_scan--) {
const int32_t cg_coeff_scan = cg_scan << LOG2_SCAN_SET_SIZE;
// Find positions of first and last non-zero coefficients in the CG.
int32_t last_nz_scan = -1;
for (int32_t coeff_i = SCAN_SET_SIZE - 1; coeff_i >= 0; --coeff_i) {
if (quant_coeffs[scan2raster[coeff_i + cg_coeff_scan]]) {
last_nz_scan = coeff_i;
break;
}
}
int32_t first_nz_scan = SCAN_SET_SIZE;
for (int32_t coeff_i = 0; coeff_i <= last_nz_scan; coeff_i++) {
if (quant_coeffs[scan2raster[coeff_i + cg_coeff_scan]]) {
first_nz_scan = coeff_i;
break;
}
}
if (last_nz_scan - first_nz_scan < SBH_THRESHOLD) {
continue;
}
const int32_t signbit = quant_coeffs[scan2raster[cg_coeff_scan + first_nz_scan]] <= 0;
unsigned abs_coeff_sum = 0;
for (int32_t coeff_scan = first_nz_scan; coeff_scan <= last_nz_scan; coeff_scan++) {
abs_coeff_sum += quant_coeffs[scan2raster[coeff_scan + cg_coeff_scan]];
}
if (signbit == (abs_coeff_sum & 0x1)) {
// Sign already matches with the parity, no need to modify coefficients.
continue;
}
// Otherwise, search for the best coeff to change by one and change it.
struct {
int64_t cost;
int pos;
int change;
} current, best = { MAX_INT64, 0, 0 };
const int last_coeff_scan = (cg_scan == last_cg ? last_nz_scan : SCAN_SET_SIZE - 1);
for (int coeff_scan = last_coeff_scan; coeff_scan >= 0; --coeff_scan) {
current.pos = scan2raster[coeff_scan + cg_coeff_scan];
// Shift the calculation back into original precision to avoid
// changing the bitstream.
# define PRECISION_INC (15 - CTX_FRAC_BITS)
int64_t quant_cost_in_bits = rd_factor * sh_rates->quant_delta[current.pos];
coeff_t abs_coeff = abs(quant_coeffs[current.pos]);
if (abs_coeff != 0) {
// Choose between incrementing and decrementing a non-zero coeff.
int64_t inc_bits = sh_rates->inc[current.pos];
int64_t dec_bits = sh_rates->dec[current.pos];
if (abs_coeff == 1) {
// We save sign bit and sig_coeff goes to zero.
dec_bits -= CTX_FRAC_ONE_BIT + sh_rates->sig_coeff_inc[current.pos];
}
if (cg_scan == last_cg && last_nz_scan == coeff_scan && abs_coeff == 1) {
// Changing the last non-zero bit in the last cg to zero.
// This might save a lot of bits if the next bits are already
// zeros, or just a coupple fractional bits if they are not.
// TODO: Check if calculating the real savings makes sense.
dec_bits -= 4 * CTX_FRAC_ONE_BIT;
}
inc_bits = -quant_cost_in_bits + inc_bits * (1 << PRECISION_INC);
dec_bits = quant_cost_in_bits + dec_bits * (1 << PRECISION_INC);
if (inc_bits < dec_bits) {
current.change = 1;
current.cost = inc_bits;
} else {
current.change = -1;
current.cost = dec_bits;
if (coeff_scan == first_nz_scan && abs_coeff == 1) {
// Don't turn first non-zero coeff into zero.
// Seems kind of arbitrary. It's probably because it could lead to
// breaking SBH_THRESHOLD.
current.cost = MAX_INT64;
}
}
} else {
// Try incrementing a zero coeff.
// Add sign bit, other bits and sig_coeff goes to one.
int bits = CTX_FRAC_ONE_BIT + sh_rates->inc[current.pos] + sh_rates->sig_coeff_inc[current.pos];
current.cost = -llabs(quant_cost_in_bits) + bits * (1 << PRECISION_INC);
current.change = 1;
if (coeff_scan < first_nz_scan) {
if (((coeffs[current.pos] >= 0) ? 0 : 1) != signbit) {
current.cost = MAX_INT64;
}
}
}
if (current.cost < best.cost) {
best = current;
}
}
if (quant_coeffs[best.pos] == 32767 || quant_coeffs[best.pos] == -32768) {
best.change = -1;
}
if (coeffs[best.pos] >= 0) {
quant_coeffs[best.pos] += best.change;
} else {
quant_coeffs[best.pos] -= best.change;
}
}
}
/** RDOQ with CABAC
* \returns void
* Rate distortion optimized quantization for entropy
* coding engines using probability models like CABAC
* From HM 12.0
*/
void kvz_rdoq(encoder_state_t * const state, coeff_t *coef, coeff_t *dest_coeff, int32_t width,
int32_t height, int8_t type, int8_t scan_mode, int8_t block_type, int8_t tr_depth)
{
const encoder_control_t * const encoder = state->encoder_control;
cabac_data_t * const cabac = &state->cabac;
uint32_t log2_tr_size = kvz_g_convert_to_bit[ width ] + 2;
int32_t transform_shift = MAX_TR_DYNAMIC_RANGE - encoder->bitdepth - log2_tr_size; // Represents scaling through forward transform
uint16_t go_rice_param = 0;
uint32_t log2_block_size = kvz_g_convert_to_bit[ width ] + 2;
int32_t scalinglist_type= (block_type == CU_INTRA ? 0 : 3) + (int8_t)("\0\3\1\2"[type]);
int32_t qp_scaled = kvz_get_scaled_qp(type, state->qp, (encoder->bitdepth - 8) * 6);
int32_t q_bits = QUANT_SHIFT + qp_scaled/6 + transform_shift;
const int32_t *quant_coeff = encoder->scaling_list.quant_coeff[log2_tr_size-2][scalinglist_type][qp_scaled%6];
const double *err_scale = encoder->scaling_list.error_scale[log2_tr_size-2][scalinglist_type][qp_scaled%6];
double block_uncoded_cost = 0;
double cost_coeff [ 32 * 32 ];
double cost_sig [ 32 * 32 ];
double cost_coeff0[ 32 * 32 ];
struct sh_rates_t sh_rates;
const uint32_t *scan_cg = g_sig_last_scan_cg[log2_block_size - 2][scan_mode];
const uint32_t cg_size = 16;
const int32_t shift = 4 >> 1;
const uint32_t num_blk_side = width >> shift;
double cost_coeffgroup_sig[ 64 ];
uint32_t sig_coeffgroup_flag[ 64 ];
uint16_t ctx_set = 0;
int16_t c1 = 1;
int16_t c2 = 0;
double base_cost = 0;
uint32_t c1_idx = 0;
uint32_t c2_idx = 0;
int32_t base_level;
const uint32_t *scan = kvz_g_sig_last_scan[ scan_mode ][ log2_block_size - 1 ];
int32_t cg_last_scanpos = -1;
int32_t last_scanpos = -1;
uint32_t cg_num = width * height >> 4;
// Explicitly tell the only possible numbers of elements to be zeroed.
// Hope the compiler is able to utilize this information.
switch (cg_num) {
case 1: FILL_ARRAY(sig_coeffgroup_flag, 0, 1); break;
case 4: FILL_ARRAY(sig_coeffgroup_flag, 0, 4); break;
case 16: FILL_ARRAY(sig_coeffgroup_flag, 0, 16); break;
case 64: FILL_ARRAY(sig_coeffgroup_flag, 0, 64); break;
default: assert(0 && "There should be 1, 4, 16 or 64 coefficient groups");
}
cabac_ctx_t *base_coeff_group_ctx = &(cabac->ctx.cu_sig_coeff_group_model[type]);
cabac_ctx_t *baseCtx = (type == 0) ? &(cabac->ctx.cu_sig_model_luma[0]) : &(cabac->ctx.cu_sig_model_chroma[0]);
cabac_ctx_t *base_one_ctx = (type == 0) ? &(cabac->ctx.cu_one_model_luma[0]) : &(cabac->ctx.cu_one_model_chroma[0]);
struct {
double coded_level_and_dist;
double uncoded_dist;
double sig_cost;
double sig_cost_0;
int32_t nnz_before_pos0;
} rd_stats;
//Find last cg and last scanpos
int32_t cg_scanpos;
for (cg_scanpos = (cg_num - 1); cg_scanpos >= 0; cg_scanpos--)
{
for (int32_t scanpos_in_cg = (cg_size - 1); scanpos_in_cg >= 0; scanpos_in_cg--)
{
int32_t scanpos = cg_scanpos*cg_size + scanpos_in_cg;
uint32_t blkpos = scan[scanpos];
int32_t q = quant_coeff[blkpos];
int32_t level_double = coef[blkpos];
level_double = MIN(abs(level_double) * q, MAX_INT - (1 << (q_bits - 1)));
uint32_t max_abs_level = (level_double + (1 << (q_bits - 1))) >> q_bits;
if (max_abs_level > 0) {
last_scanpos = scanpos;
ctx_set = (scanpos > 0 && type == 0) ? 2 : 0;
cg_last_scanpos = cg_scanpos;
sh_rates.sig_coeff_inc[blkpos] = 0;
break;
}
dest_coeff[blkpos] = 0;
}
if (last_scanpos != -1) break;
}
if (last_scanpos == -1) {
return;
}
for (; cg_scanpos >= 0; cg_scanpos--) cost_coeffgroup_sig[cg_scanpos] = 0;
int32_t last_x_bits[32], last_y_bits[32];
calc_last_bits(state, width, height, type, last_x_bits, last_y_bits);
for (int32_t cg_scanpos = cg_last_scanpos; cg_scanpos >= 0; cg_scanpos--) {
uint32_t cg_blkpos = scan_cg[cg_scanpos];
uint32_t cg_pos_y = cg_blkpos / num_blk_side;
uint32_t cg_pos_x = cg_blkpos - (cg_pos_y * num_blk_side);
int32_t pattern_sig_ctx = kvz_context_calc_pattern_sig_ctx(sig_coeffgroup_flag,
cg_pos_x, cg_pos_y, width);
FILL(rd_stats, 0);
for (int32_t scanpos_in_cg = cg_size - 1; scanpos_in_cg >= 0; scanpos_in_cg--) {
int32_t scanpos = cg_scanpos*cg_size + scanpos_in_cg;
if (scanpos > last_scanpos) continue;
uint32_t blkpos = scan[scanpos];
int32_t q = quant_coeff[blkpos];
double temp = err_scale[blkpos];
int32_t level_double = coef[blkpos];
level_double = MIN(abs(level_double) * q , MAX_INT - (1 << (q_bits - 1)));
uint32_t max_abs_level = (level_double + (1 << (q_bits - 1))) >> q_bits;
double err = (double)level_double;
cost_coeff0[scanpos] = err * err * temp;
block_uncoded_cost += cost_coeff0[ scanpos ];
//===== coefficient level estimation =====
int32_t level;
uint16_t one_ctx = 4 * ctx_set + c1;
uint16_t abs_ctx = ctx_set + c2;
if( scanpos == last_scanpos ) {
level = kvz_get_coded_level(state, &cost_coeff[ scanpos ], &cost_coeff0[ scanpos ], &cost_sig[ scanpos ],
level_double, max_abs_level, 0, one_ctx, abs_ctx, go_rice_param,
c1_idx, c2_idx, q_bits, temp, 1, type );
} else {
uint32_t pos_y = blkpos >> log2_block_size;
uint32_t pos_x = blkpos - ( pos_y << log2_block_size );
uint16_t ctx_sig = (uint16_t)kvz_context_get_sig_ctx_inc(pattern_sig_ctx, scan_mode, pos_x, pos_y,
log2_block_size, type);
level = kvz_get_coded_level(state, &cost_coeff[ scanpos ], &cost_coeff0[ scanpos ], &cost_sig[ scanpos ],
level_double, max_abs_level, ctx_sig, one_ctx, abs_ctx, go_rice_param,
c1_idx, c2_idx, q_bits, temp, 0, type );
if (encoder->cfg.signhide_enable) {
int greater_than_zero = CTX_ENTROPY_BITS(&baseCtx[ctx_sig], 1);
int zero = CTX_ENTROPY_BITS(&baseCtx[ctx_sig], 0);
sh_rates.sig_coeff_inc[blkpos] = greater_than_zero - zero;
}
}
if (encoder->cfg.signhide_enable) {
sh_rates.quant_delta[blkpos] = (level_double - level * (1 << q_bits)) >> (q_bits - 8);
if (level > 0) {
int32_t rate_now = kvz_get_ic_rate(state, level, one_ctx, abs_ctx, go_rice_param, c1_idx, c2_idx, type);
int32_t rate_up = kvz_get_ic_rate(state, level + 1, one_ctx, abs_ctx, go_rice_param, c1_idx, c2_idx, type);
int32_t rate_down = kvz_get_ic_rate(state, level - 1, one_ctx, abs_ctx, go_rice_param, c1_idx, c2_idx, type);
sh_rates.inc[blkpos] = rate_up - rate_now;
sh_rates.dec[blkpos] = rate_down - rate_now;
} else { // level == 0
sh_rates.inc[blkpos] = CTX_ENTROPY_BITS(&base_one_ctx[one_ctx], 0);
}
}
dest_coeff[blkpos] = (coeff_t)level;
base_cost += cost_coeff[scanpos];
base_level = (c1_idx < C1FLAG_NUMBER) ? (2 + (c2_idx < C2FLAG_NUMBER)) : 1;
if (level >= base_level) {
if(level > 3*(1<<go_rice_param)) {
go_rice_param = MIN(go_rice_param + 1, 4);
}
}
if (level >= 1) c1_idx ++;
//===== update bin model =====
if (level > 1) {
c1 = 0;
c2 += (c2 < 2);
c2_idx ++;
} else if( (c1 < 3) && (c1 > 0) && level) {
c1++;
}
//===== context set update =====
if ((scanpos % SCAN_SET_SIZE == 0) && scanpos > 0) {
c2 = 0;
go_rice_param = 0;
c1_idx = 0;
c2_idx = 0;
ctx_set = (scanpos == SCAN_SET_SIZE || type != 0) ? 0 : 2;
if( c1 == 0 ) {
ctx_set++;
}
c1 = 1;
}
rd_stats.sig_cost += cost_sig[scanpos];
if ( scanpos_in_cg == 0 ) {
rd_stats.sig_cost_0 = cost_sig[scanpos];
}
if ( dest_coeff[blkpos] ) {
sig_coeffgroup_flag[cg_blkpos] = 1;
rd_stats.coded_level_and_dist += cost_coeff[scanpos] - cost_sig[scanpos];
rd_stats.uncoded_dist += cost_coeff0[scanpos];
if ( scanpos_in_cg != 0 ) {
rd_stats.nnz_before_pos0++;
}
}
} //end for (scanpos_in_cg)
if( cg_scanpos ) {
if (sig_coeffgroup_flag[cg_blkpos] == 0) {
uint32_t ctx_sig = kvz_context_get_sig_coeff_group(sig_coeffgroup_flag, cg_pos_x,
cg_pos_y, width);
cost_coeffgroup_sig[cg_scanpos] = state->lambda *CTX_ENTROPY_BITS(&base_coeff_group_ctx[ctx_sig],0);
base_cost += cost_coeffgroup_sig[cg_scanpos] - rd_stats.sig_cost;
} else {
if (cg_scanpos < cg_last_scanpos){
double cost_zero_cg;
uint32_t ctx_sig;
if (rd_stats.nnz_before_pos0 == 0) {
base_cost -= rd_stats.sig_cost_0;
rd_stats.sig_cost -= rd_stats.sig_cost_0;
}
// rd-cost if SigCoeffGroupFlag = 0, initialization
cost_zero_cg = base_cost;
// add SigCoeffGroupFlag cost to total cost
ctx_sig = kvz_context_get_sig_coeff_group(sig_coeffgroup_flag, cg_pos_x,
cg_pos_y, width);
cost_coeffgroup_sig[cg_scanpos] = state->lambda * CTX_ENTROPY_BITS(&base_coeff_group_ctx[ctx_sig], 1);
base_cost += cost_coeffgroup_sig[cg_scanpos];
cost_zero_cg += state->lambda * CTX_ENTROPY_BITS(&base_coeff_group_ctx[ctx_sig], 0);
// try to convert the current coeff group from non-zero to all-zero
cost_zero_cg += rd_stats.uncoded_dist; // distortion for resetting non-zero levels to zero levels
cost_zero_cg -= rd_stats.coded_level_and_dist; // distortion and level cost for keeping all non-zero levels
cost_zero_cg -= rd_stats.sig_cost; // sig cost for all coeffs, including zero levels and non-zerl levels
// if we can save cost, change this block to all-zero block
if (cost_zero_cg < base_cost) {
sig_coeffgroup_flag[cg_blkpos] = 0;
base_cost = cost_zero_cg;
cost_coeffgroup_sig[cg_scanpos] = state->lambda * CTX_ENTROPY_BITS(&base_coeff_group_ctx[ctx_sig], 0);
// reset coeffs to 0 in this block
for (int32_t scanpos_in_cg = cg_size - 1; scanpos_in_cg >= 0; scanpos_in_cg--) {
int32_t scanpos = cg_scanpos*cg_size + scanpos_in_cg;
uint32_t blkpos = scan[scanpos];
if (dest_coeff[blkpos]){
dest_coeff[blkpos] = 0;
cost_coeff[scanpos] = cost_coeff0[scanpos];
cost_sig[scanpos] = 0;
}
}
} // end if ( cost_all_zeros < base_cost )
}
} // end if if (sig_coeffgroup_flag[ cg_blkpos ] == 0)
} else {
sig_coeffgroup_flag[cg_blkpos] = 1;
}
} //end for (cg_scanpos)
//===== estimate last position =====
double best_cost = 0;
int32_t ctx_cbf = 0;
int8_t found_last = 0;
int32_t best_last_idx_p1 = 0;
if( block_type != CU_INTRA && !type/* && pcCU->getTransformIdx( uiAbsPartIdx ) == 0*/ ) {
best_cost = block_uncoded_cost + state->lambda * CTX_ENTROPY_BITS(&(cabac->ctx.cu_qt_root_cbf_model),0);
base_cost += state->lambda * CTX_ENTROPY_BITS(&(cabac->ctx.cu_qt_root_cbf_model),1);
} else {
cabac_ctx_t* base_cbf_model = type?(cabac->ctx.qt_cbf_model_chroma):(cabac->ctx.qt_cbf_model_luma);
ctx_cbf = ( type ? tr_depth : !tr_depth);
best_cost = block_uncoded_cost + state->lambda * CTX_ENTROPY_BITS(&base_cbf_model[ctx_cbf],0);
base_cost += state->lambda * CTX_ENTROPY_BITS(&base_cbf_model[ctx_cbf],1);
}
for ( int32_t cg_scanpos = cg_last_scanpos; cg_scanpos >= 0; cg_scanpos--) {
uint32_t cg_blkpos = scan_cg[cg_scanpos];
base_cost -= cost_coeffgroup_sig[cg_scanpos];
if (sig_coeffgroup_flag[ cg_blkpos ]) {
for ( int32_t scanpos_in_cg = cg_size - 1; scanpos_in_cg >= 0; scanpos_in_cg--) {
int32_t scanpos = cg_scanpos*cg_size + scanpos_in_cg;
if (scanpos > last_scanpos) continue;
uint32_t blkpos = scan[scanpos];
if( dest_coeff[ blkpos ] ) {
uint32_t pos_y = blkpos >> log2_block_size;
uint32_t pos_x = blkpos - ( pos_y << log2_block_size );
double cost_last = (scan_mode == SCAN_VER) ? get_rate_last(state, pos_y, pos_x,last_x_bits,last_y_bits) : get_rate_last(state, pos_x, pos_y, last_x_bits,last_y_bits );
double totalCost = base_cost + cost_last - cost_sig[ scanpos ];
if( totalCost < best_cost ) {
best_last_idx_p1 = scanpos + 1;
best_cost = totalCost;
}
if( dest_coeff[ blkpos ] > 1 ) {
found_last = 1;
break;
}
base_cost -= cost_coeff[scanpos];
base_cost += cost_coeff0[scanpos];
} else {
base_cost -= cost_sig[scanpos];
}
} //end for
if (found_last) break;
} // end if (sig_coeffgroup_flag[ cg_blkpos ])
} // end for
uint32_t abs_sum = 0;
for ( int32_t scanpos = 0; scanpos < best_last_idx_p1; scanpos++) {
int32_t blkPos = scan[scanpos];
int32_t level = dest_coeff[blkPos];
abs_sum += level;
dest_coeff[blkPos] = (coeff_t)(( coef[blkPos] < 0 ) ? -level : level);
}
//===== clean uncoded coefficients =====
for ( int32_t scanpos = best_last_idx_p1; scanpos <= last_scanpos; scanpos++) {
dest_coeff[scan[scanpos]] = 0;
}
if (encoder->cfg.signhide_enable && abs_sum >= 2) {
kvz_rdoq_sign_hiding(state, qp_scaled, scan, &sh_rates, best_last_idx_p1, coef, dest_coeff);
}
}
/**
* Calculate cost of actual motion vectors using CABAC coding
*/
uint32_t kvz_get_mvd_coding_cost_cabac(const encoder_state_t *state,
const cabac_data_t* cabac,
const int32_t mvd_hor,
const int32_t mvd_ver)
{
cabac_data_t cabac_copy = *cabac;
cabac_copy.only_count = 1;
// It is safe to drop const here because cabac->only_count is set.
kvz_encode_mvd((encoder_state_t*) state, &cabac_copy, mvd_hor, mvd_ver);
uint32_t bitcost =
((23 - cabac_copy.bits_left) + (cabac_copy.num_buffered_bytes << 3)) -
((23 - cabac->bits_left) + (cabac->num_buffered_bytes << 3));
return bitcost;
}
/** MVD cost calculation with CABAC
* \returns int
* Calculates Motion Vector cost and related costs using CABAC coding
*/
uint32_t kvz_calc_mvd_cost_cabac(const encoder_state_t * state,
int x,
int y,
int mv_shift,
int16_t mv_cand[2][2],
inter_merge_cand_t merge_cand[MRG_MAX_NUM_CANDS],
int16_t num_cand,
int32_t ref_idx,
uint32_t *bitcost)
{
cabac_data_t state_cabac_copy;
cabac_data_t* cabac;
uint32_t merge_idx;
vector2d_t mvd = { 0, 0 };
int8_t merged = 0;
int8_t cur_mv_cand = 0;
x *= 1 << mv_shift;
y *= 1 << mv_shift;
// Check every candidate to find a match
for (merge_idx = 0; merge_idx < (uint32_t)num_cand; merge_idx++) {
if (merge_cand[merge_idx].dir == 3) continue;
if (merge_cand[merge_idx].mv[merge_cand[merge_idx].dir - 1][0] == x &&
merge_cand[merge_idx].mv[merge_cand[merge_idx].dir - 1][1] == y &&
state->frame->ref_LX[merge_cand[merge_idx].dir - 1][
merge_cand[merge_idx].ref[merge_cand[merge_idx].dir - 1]
] == ref_idx)
{
merged = 1;
break;
}
}
// Store cabac state and contexts
memcpy(&state_cabac_copy, &state->cabac, sizeof(cabac_data_t));
// Clear bytes and bits and set mode to "count"
state_cabac_copy.only_count = 1;
state_cabac_copy.num_buffered_bytes = 0;
state_cabac_copy.bits_left = 23;
cabac = &state_cabac_copy;
if (!merged) {
vector2d_t mvd1 = {
x - mv_cand[0][0],
y - mv_cand[0][1],
};
vector2d_t mvd2 = {
x - mv_cand[1][0],
y - mv_cand[1][1],
};
uint32_t cand1_cost = kvz_get_mvd_coding_cost_cabac(state, cabac, mvd1.x, mvd1.y);
uint32_t cand2_cost = kvz_get_mvd_coding_cost_cabac(state, cabac, mvd2.x, mvd2.y);
// Select candidate 1 if it has lower cost
if (cand2_cost < cand1_cost) {
cur_mv_cand = 1;
mvd = mvd2;
} else {
mvd = mvd1;
}
}
cabac->cur_ctx = &(cabac->ctx.cu_merge_flag_ext_model);
CABAC_BIN(cabac, merged, "MergeFlag");
num_cand = MRG_MAX_NUM_CANDS;
if (merged) {
if (num_cand > 1) {
int32_t ui;
for (ui = 0; ui < num_cand - 1; ui++) {
int32_t symbol = (ui != merge_idx);
if (ui == 0) {
cabac->cur_ctx = &(cabac->ctx.cu_merge_idx_ext_model);
CABAC_BIN(cabac, symbol, "MergeIndex");
} else {
CABAC_BIN_EP(cabac, symbol, "MergeIndex");
}
if (symbol == 0) break;
}
}
} else {
uint32_t ref_list_idx;
uint32_t j;
int ref_list[2] = { 0, 0 };
for (j = 0; j < state->frame->ref->used_size; j++) {
if (state->frame->ref->pocs[j] < state->frame->poc) {
ref_list[0]++;
} else {
ref_list[1]++;
}
}
//ToDo: bidir mv support
for (ref_list_idx = 0; ref_list_idx < 2; ref_list_idx++) {
if (/*cur_cu->inter.mv_dir*/ 1 & (1 << ref_list_idx)) {
if (ref_list[ref_list_idx] > 1) {
// parseRefFrmIdx
int32_t ref_frame = ref_idx;
cabac->cur_ctx = &(cabac->ctx.cu_ref_pic_model[0]);
CABAC_BIN(cabac, (ref_frame != 0), "ref_idx_lX");
if (ref_frame > 0) {
int32_t i;
int32_t ref_num = ref_list[ref_list_idx] - 2;
cabac->cur_ctx = &(cabac->ctx.cu_ref_pic_model[1]);
ref_frame--;
for (i = 0; i < ref_num; ++i) {
const uint32_t symbol = (i == ref_frame) ? 0 : 1;
if (i == 0) {
CABAC_BIN(cabac, symbol, "ref_idx_lX");
} else {
CABAC_BIN_EP(cabac, symbol, "ref_idx_lX");
}
if (symbol == 0) break;
}
}
}
// ToDo: Bidir vector support
if (!(state->frame->ref_list == REF_PIC_LIST_1 && /*cur_cu->inter.mv_dir == 3*/ 0)) {
// It is safe to drop const here because cabac->only_count is set.
kvz_encode_mvd((encoder_state_t*) state, cabac, mvd.x, mvd.y);
}
// Signal which candidate MV to use
kvz_cabac_write_unary_max_symbol(
cabac,
cabac->ctx.mvp_idx_model,
cur_mv_cand,
1,
AMVP_MAX_NUM_CANDS - 1);
}
}
}
*bitcost = (23 - state_cabac_copy.bits_left) + (state_cabac_copy.num_buffered_bytes << 3);
// Store bitcost before restoring cabac
return *bitcost * (uint32_t)(state->lambda_sqrt + 0.5);
}
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