ref: 67aa6c8c23bc6ca90cfde756015f0aae61fe20f7
dir: /vp9/encoder/vp9_quantize.c/
/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <assert.h>
#include <math.h>
#include "./vpx_dsp_rtcd.h"
#include "vpx_mem/vpx_mem.h"
#include "vpx_ports/mem.h"
#include "vp9/common/vp9_quant_common.h"
#include "vp9/common/vp9_seg_common.h"
#include "vp9/encoder/vp9_encoder.h"
#include "vp9/encoder/vp9_quantize.h"
#include "vp9/encoder/vp9_rd.h"
void vp9_quantize_fp_c(const tran_low_t *coeff_ptr, intptr_t n_coeffs,
int skip_block, const int16_t *round_ptr,
const int16_t *quant_ptr, tran_low_t *qcoeff_ptr,
tran_low_t *dqcoeff_ptr, const int16_t *dequant_ptr,
uint16_t *eob_ptr, const int16_t *scan,
const int16_t *iscan) {
int i, eob = -1;
(void)iscan;
(void)skip_block;
assert(!skip_block);
memset(qcoeff_ptr, 0, n_coeffs * sizeof(*qcoeff_ptr));
memset(dqcoeff_ptr, 0, n_coeffs * sizeof(*dqcoeff_ptr));
// Quantization pass: All coefficients with index >= zero_flag are
// skippable. Note: zero_flag can be zero.
for (i = 0; i < n_coeffs; i++) {
const int rc = scan[i];
const int coeff = coeff_ptr[rc];
const int coeff_sign = (coeff >> 31);
const int abs_coeff = (coeff ^ coeff_sign) - coeff_sign;
int tmp = clamp(abs_coeff + round_ptr[rc != 0], INT16_MIN, INT16_MAX);
tmp = (tmp * quant_ptr[rc != 0]) >> 16;
qcoeff_ptr[rc] = (tmp ^ coeff_sign) - coeff_sign;
dqcoeff_ptr[rc] = qcoeff_ptr[rc] * dequant_ptr[rc != 0];
if (tmp) eob = i;
}
*eob_ptr = eob + 1;
}
#if CONFIG_VP9_HIGHBITDEPTH
void vp9_highbd_quantize_fp_c(const tran_low_t *coeff_ptr, intptr_t n_coeffs,
int skip_block, const int16_t *round_ptr,
const int16_t *quant_ptr, tran_low_t *qcoeff_ptr,
tran_low_t *dqcoeff_ptr,
const int16_t *dequant_ptr, uint16_t *eob_ptr,
const int16_t *scan, const int16_t *iscan) {
int i;
int eob = -1;
(void)iscan;
(void)skip_block;
assert(!skip_block);
memset(qcoeff_ptr, 0, n_coeffs * sizeof(*qcoeff_ptr));
memset(dqcoeff_ptr, 0, n_coeffs * sizeof(*dqcoeff_ptr));
// Quantization pass: All coefficients with index >= zero_flag are
// skippable. Note: zero_flag can be zero.
for (i = 0; i < n_coeffs; i++) {
const int rc = scan[i];
const int coeff = coeff_ptr[rc];
const int coeff_sign = (coeff >> 31);
const int abs_coeff = (coeff ^ coeff_sign) - coeff_sign;
const int64_t tmp = abs_coeff + round_ptr[rc != 0];
const int abs_qcoeff = (int)((tmp * quant_ptr[rc != 0]) >> 16);
qcoeff_ptr[rc] = (tran_low_t)(abs_qcoeff ^ coeff_sign) - coeff_sign;
dqcoeff_ptr[rc] = qcoeff_ptr[rc] * dequant_ptr[rc != 0];
if (abs_qcoeff) eob = i;
}
*eob_ptr = eob + 1;
}
#endif
// TODO(jingning) Refactor this file and combine functions with similar
// operations.
void vp9_quantize_fp_32x32_c(const tran_low_t *coeff_ptr, intptr_t n_coeffs,
int skip_block, const int16_t *round_ptr,
const int16_t *quant_ptr, tran_low_t *qcoeff_ptr,
tran_low_t *dqcoeff_ptr,
const int16_t *dequant_ptr, uint16_t *eob_ptr,
const int16_t *scan, const int16_t *iscan) {
int i, eob = -1;
(void)iscan;
(void)skip_block;
assert(!skip_block);
memset(qcoeff_ptr, 0, n_coeffs * sizeof(*qcoeff_ptr));
memset(dqcoeff_ptr, 0, n_coeffs * sizeof(*dqcoeff_ptr));
for (i = 0; i < n_coeffs; i++) {
const int rc = scan[i];
const int coeff = coeff_ptr[rc];
const int coeff_sign = (coeff >> 31);
int tmp = 0;
int abs_coeff = (coeff ^ coeff_sign) - coeff_sign;
if (abs_coeff >= (dequant_ptr[rc != 0] >> 2)) {
abs_coeff += ROUND_POWER_OF_TWO(round_ptr[rc != 0], 1);
abs_coeff = clamp(abs_coeff, INT16_MIN, INT16_MAX);
tmp = (abs_coeff * quant_ptr[rc != 0]) >> 15;
qcoeff_ptr[rc] = (tmp ^ coeff_sign) - coeff_sign;
dqcoeff_ptr[rc] = qcoeff_ptr[rc] * dequant_ptr[rc != 0] / 2;
}
if (tmp) eob = i;
}
*eob_ptr = eob + 1;
}
#if CONFIG_VP9_HIGHBITDEPTH
void vp9_highbd_quantize_fp_32x32_c(
const tran_low_t *coeff_ptr, intptr_t n_coeffs, int skip_block,
const int16_t *round_ptr, const int16_t *quant_ptr, tran_low_t *qcoeff_ptr,
tran_low_t *dqcoeff_ptr, const int16_t *dequant_ptr, uint16_t *eob_ptr,
const int16_t *scan, const int16_t *iscan) {
int i, eob = -1;
(void)iscan;
(void)skip_block;
assert(!skip_block);
memset(qcoeff_ptr, 0, n_coeffs * sizeof(*qcoeff_ptr));
memset(dqcoeff_ptr, 0, n_coeffs * sizeof(*dqcoeff_ptr));
for (i = 0; i < n_coeffs; i++) {
int abs_qcoeff = 0;
const int rc = scan[i];
const int coeff = coeff_ptr[rc];
const int coeff_sign = (coeff >> 31);
const int abs_coeff = (coeff ^ coeff_sign) - coeff_sign;
if (abs_coeff >= (dequant_ptr[rc != 0] >> 2)) {
const int64_t tmp = abs_coeff + ROUND_POWER_OF_TWO(round_ptr[rc != 0], 1);
abs_qcoeff = (int)((tmp * quant_ptr[rc != 0]) >> 15);
qcoeff_ptr[rc] = (tran_low_t)((abs_qcoeff ^ coeff_sign) - coeff_sign);
dqcoeff_ptr[rc] = qcoeff_ptr[rc] * dequant_ptr[rc != 0] / 2;
}
if (abs_qcoeff) eob = i;
}
*eob_ptr = eob + 1;
}
#endif
void vp9_regular_quantize_b_4x4(MACROBLOCK *x, int plane, int block,
const int16_t *scan, const int16_t *iscan) {
MACROBLOCKD *const xd = &x->e_mbd;
struct macroblock_plane *p = &x->plane[plane];
struct macroblockd_plane *pd = &xd->plane[plane];
tran_low_t *qcoeff = BLOCK_OFFSET(p->qcoeff, block),
*dqcoeff = BLOCK_OFFSET(pd->dqcoeff, block);
const int n_coeffs = 4 * 4;
if (x->skip_block) {
memset(qcoeff, 0, n_coeffs * sizeof(*qcoeff));
memset(dqcoeff, 0, n_coeffs * sizeof(*dqcoeff));
return;
}
#if CONFIG_VP9_HIGHBITDEPTH
if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
vpx_highbd_quantize_b(BLOCK_OFFSET(p->coeff, block), n_coeffs,
x->skip_block, p->zbin, p->round, p->quant,
p->quant_shift, qcoeff, dqcoeff, pd->dequant,
&p->eobs[block], scan, iscan);
return;
}
#endif
vpx_quantize_b(BLOCK_OFFSET(p->coeff, block), n_coeffs, x->skip_block,
p->zbin, p->round, p->quant, p->quant_shift, qcoeff, dqcoeff,
pd->dequant, &p->eobs[block], scan, iscan);
}
static void invert_quant(int16_t *quant, int16_t *shift, int d) {
unsigned t;
int l, m;
t = d;
for (l = 0; t > 1; l++) t >>= 1;
m = 1 + (1 << (16 + l)) / d;
*quant = (int16_t)(m - (1 << 16));
*shift = 1 << (16 - l);
}
static int get_qzbin_factor(int q, vpx_bit_depth_t bit_depth) {
const int quant = vp9_dc_quant(q, 0, bit_depth);
#if CONFIG_VP9_HIGHBITDEPTH
switch (bit_depth) {
case VPX_BITS_8: return q == 0 ? 64 : (quant < 148 ? 84 : 80);
case VPX_BITS_10: return q == 0 ? 64 : (quant < 592 ? 84 : 80);
default:
assert(bit_depth == VPX_BITS_12);
return q == 0 ? 64 : (quant < 2368 ? 84 : 80);
}
#else
(void)bit_depth;
return q == 0 ? 64 : (quant < 148 ? 84 : 80);
#endif
}
void vp9_init_quantizer(VP9_COMP *cpi) {
VP9_COMMON *const cm = &cpi->common;
QUANTS *const quants = &cpi->quants;
int i, q, quant;
for (q = 0; q < QINDEX_RANGE; q++) {
int qzbin_factor = get_qzbin_factor(q, cm->bit_depth);
int qrounding_factor = q == 0 ? 64 : 48;
const int sharpness_adjustment = 16 * (7 - cpi->oxcf.sharpness) / 7;
if (cpi->oxcf.sharpness > 0 && q > 0) {
qzbin_factor = 64 + sharpness_adjustment;
qrounding_factor = 64 - sharpness_adjustment;
}
for (i = 0; i < 2; ++i) {
int qrounding_factor_fp = i == 0 ? 48 : 42;
if (q == 0) qrounding_factor_fp = 64;
if (cpi->oxcf.sharpness > 0)
qrounding_factor_fp = 64 - sharpness_adjustment;
// y
quant = i == 0 ? vp9_dc_quant(q, cm->y_dc_delta_q, cm->bit_depth)
: vp9_ac_quant(q, 0, cm->bit_depth);
invert_quant(&quants->y_quant[q][i], &quants->y_quant_shift[q][i], quant);
quants->y_quant_fp[q][i] = (1 << 16) / quant;
quants->y_round_fp[q][i] = (qrounding_factor_fp * quant) >> 7;
quants->y_zbin[q][i] = ROUND_POWER_OF_TWO(qzbin_factor * quant, 7);
quants->y_round[q][i] = (qrounding_factor * quant) >> 7;
cpi->y_dequant[q][i] = quant;
// uv
quant = i == 0 ? vp9_dc_quant(q, cm->uv_dc_delta_q, cm->bit_depth)
: vp9_ac_quant(q, cm->uv_ac_delta_q, cm->bit_depth);
invert_quant(&quants->uv_quant[q][i], &quants->uv_quant_shift[q][i],
quant);
quants->uv_quant_fp[q][i] = (1 << 16) / quant;
quants->uv_round_fp[q][i] = (qrounding_factor_fp * quant) >> 7;
quants->uv_zbin[q][i] = ROUND_POWER_OF_TWO(qzbin_factor * quant, 7);
quants->uv_round[q][i] = (qrounding_factor * quant) >> 7;
cpi->uv_dequant[q][i] = quant;
}
for (i = 2; i < 8; i++) {
quants->y_quant[q][i] = quants->y_quant[q][1];
quants->y_quant_fp[q][i] = quants->y_quant_fp[q][1];
quants->y_round_fp[q][i] = quants->y_round_fp[q][1];
quants->y_quant_shift[q][i] = quants->y_quant_shift[q][1];
quants->y_zbin[q][i] = quants->y_zbin[q][1];
quants->y_round[q][i] = quants->y_round[q][1];
cpi->y_dequant[q][i] = cpi->y_dequant[q][1];
quants->uv_quant[q][i] = quants->uv_quant[q][1];
quants->uv_quant_fp[q][i] = quants->uv_quant_fp[q][1];
quants->uv_round_fp[q][i] = quants->uv_round_fp[q][1];
quants->uv_quant_shift[q][i] = quants->uv_quant_shift[q][1];
quants->uv_zbin[q][i] = quants->uv_zbin[q][1];
quants->uv_round[q][i] = quants->uv_round[q][1];
cpi->uv_dequant[q][i] = cpi->uv_dequant[q][1];
}
}
}
void vp9_init_plane_quantizers(VP9_COMP *cpi, MACROBLOCK *x) {
const VP9_COMMON *const cm = &cpi->common;
MACROBLOCKD *const xd = &x->e_mbd;
QUANTS *const quants = &cpi->quants;
const int segment_id = xd->mi[0]->segment_id;
const int qindex = vp9_get_qindex(&cm->seg, segment_id, cm->base_qindex);
const int rdmult = vp9_compute_rd_mult(cpi, qindex + cm->y_dc_delta_q);
int i;
// Y
x->plane[0].quant = quants->y_quant[qindex];
x->plane[0].quant_fp = quants->y_quant_fp[qindex];
memcpy(x->plane[0].round_fp, quants->y_round_fp[qindex],
8 * sizeof(*(x->plane[0].round_fp)));
x->plane[0].quant_shift = quants->y_quant_shift[qindex];
x->plane[0].zbin = quants->y_zbin[qindex];
x->plane[0].round = quants->y_round[qindex];
xd->plane[0].dequant = cpi->y_dequant[qindex];
x->plane[0].quant_thred[0] = x->plane[0].zbin[0] * x->plane[0].zbin[0];
x->plane[0].quant_thred[1] = x->plane[0].zbin[1] * x->plane[0].zbin[1];
// UV
for (i = 1; i < 3; i++) {
x->plane[i].quant = quants->uv_quant[qindex];
x->plane[i].quant_fp = quants->uv_quant_fp[qindex];
memcpy(x->plane[i].round_fp, quants->uv_round_fp[qindex],
8 * sizeof(*(x->plane[i].round_fp)));
x->plane[i].quant_shift = quants->uv_quant_shift[qindex];
x->plane[i].zbin = quants->uv_zbin[qindex];
x->plane[i].round = quants->uv_round[qindex];
xd->plane[i].dequant = cpi->uv_dequant[qindex];
x->plane[i].quant_thred[0] = x->plane[i].zbin[0] * x->plane[i].zbin[0];
x->plane[i].quant_thred[1] = x->plane[i].zbin[1] * x->plane[i].zbin[1];
}
x->skip_block = segfeature_active(&cm->seg, segment_id, SEG_LVL_SKIP);
x->q_index = qindex;
set_error_per_bit(x, rdmult);
vp9_initialize_me_consts(cpi, x, x->q_index);
}
void vp9_frame_init_quantizer(VP9_COMP *cpi) {
vp9_init_plane_quantizers(cpi, &cpi->td.mb);
}
void vp9_set_quantizer(VP9_COMMON *cm, int q) {
// quantizer has to be reinitialized with vp9_init_quantizer() if any
// delta_q changes.
cm->base_qindex = q;
cm->y_dc_delta_q = 0;
cm->uv_dc_delta_q = 0;
cm->uv_ac_delta_q = 0;
}
// Table that converts 0-63 Q-range values passed in outside to the Qindex
// range used internally.
static const int quantizer_to_qindex[] = {
0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48,
52, 56, 60, 64, 68, 72, 76, 80, 84, 88, 92, 96, 100,
104, 108, 112, 116, 120, 124, 128, 132, 136, 140, 144, 148, 152,
156, 160, 164, 168, 172, 176, 180, 184, 188, 192, 196, 200, 204,
208, 212, 216, 220, 224, 228, 232, 236, 240, 244, 249, 255,
};
int vp9_quantizer_to_qindex(int quantizer) {
return quantizer_to_qindex[quantizer];
}
int vp9_qindex_to_quantizer(int qindex) {
int quantizer;
for (quantizer = 0; quantizer < 64; ++quantizer)
if (quantizer_to_qindex[quantizer] >= qindex) return quantizer;
return 63;
}