ref: ccaafeea44fae0b6cb77eba869ace1ba7e4ae63f
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 <math.h>
#include "vpx_mem/vpx_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_rdopt.h"
void vp9_quantize_b_c(const int16_t *coeff_ptr, intptr_t count,
int skip_block,
const int16_t *zbin_ptr, const int16_t *round_ptr,
const int16_t *quant_ptr, const int16_t *quant_shift_ptr,
int16_t *qcoeff_ptr, int16_t *dqcoeff_ptr,
const int16_t *dequant_ptr,
int zbin_oq_value, uint16_t *eob_ptr,
const int16_t *scan, const int16_t *iscan) {
int i, non_zero_count = (int)count, eob = -1;
const int zbins[2] = { zbin_ptr[0] + zbin_oq_value,
zbin_ptr[1] + zbin_oq_value };
const int nzbins[2] = { zbins[0] * -1,
zbins[1] * -1 };
vpx_memset(qcoeff_ptr, 0, count * sizeof(int16_t));
vpx_memset(dqcoeff_ptr, 0, count * sizeof(int16_t));
if (!skip_block) {
// Pre-scan pass
for (i = (int)count - 1; i >= 0; i--) {
const int rc = scan[i];
const int coeff = coeff_ptr[rc];
if (coeff < zbins[rc != 0] && coeff > nzbins[rc != 0])
non_zero_count--;
else
break;
}
// Quantization pass: All coefficients with index >= zero_flag are
// skippable. Note: zero_flag can be zero.
for (i = 0; i < non_zero_count; 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;
if (abs_coeff >= zbins[rc != 0]) {
int tmp = clamp(abs_coeff + round_ptr[rc != 0], INT16_MIN, INT16_MAX);
tmp = ((((tmp * quant_ptr[rc != 0]) >> 16) + tmp) *
quant_shift_ptr[rc != 0]) >> 16; // quantization
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;
}
void vp9_quantize_b_32x32_c(const int16_t *coeff_ptr, intptr_t n_coeffs,
int skip_block,
const int16_t *zbin_ptr, const int16_t *round_ptr,
const int16_t *quant_ptr,
const int16_t *quant_shift_ptr,
int16_t *qcoeff_ptr, int16_t *dqcoeff_ptr,
const int16_t *dequant_ptr,
int zbin_oq_value, uint16_t *eob_ptr,
const int16_t *scan, const int16_t *iscan) {
const int zbins[2] = { ROUND_POWER_OF_TWO(zbin_ptr[0] + zbin_oq_value, 1),
ROUND_POWER_OF_TWO(zbin_ptr[1] + zbin_oq_value, 1) };
const int nzbins[2] = {zbins[0] * -1, zbins[1] * -1};
int idx = 0;
int idx_arr[1024];
int i, eob = -1;
vpx_memset(qcoeff_ptr, 0, n_coeffs * sizeof(int16_t));
vpx_memset(dqcoeff_ptr, 0, n_coeffs * sizeof(int16_t));
if (!skip_block) {
// Pre-scan pass
for (i = 0; i < n_coeffs; i++) {
const int rc = scan[i];
const int coeff = coeff_ptr[rc];
// If the coefficient is out of the base ZBIN range, keep it for
// quantization.
if (coeff >= zbins[rc != 0] || coeff <= nzbins[rc != 0])
idx_arr[idx++] = i;
}
// Quantization pass: only process the coefficients selected in
// pre-scan pass. Note: idx can be zero.
for (i = 0; i < idx; i++) {
const int rc = scan[idx_arr[i]];
const int coeff = coeff_ptr[rc];
const int coeff_sign = (coeff >> 31);
int tmp;
int abs_coeff = (coeff ^ coeff_sign) - coeff_sign;
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]) >> 16) + abs_coeff) *
quant_shift_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 = idx_arr[i];
}
}
*eob_ptr = eob + 1;
}
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];
vp9_quantize_b(BLOCK_OFFSET(p->coeff, block),
16, x->skip_block,
p->zbin, p->round, p->quant, p->quant_shift,
BLOCK_OFFSET(p->qcoeff, block),
BLOCK_OFFSET(pd->dqcoeff, block),
pd->dequant, p->zbin_extra, &p->eobs[block], scan, iscan);
}
static void invert_quant(int16_t *quant, int16_t *shift, int d) {
unsigned t;
int l;
t = d;
for (l = 0; t > 1; l++)
t >>= 1;
t = 1 + (1 << (16 + l)) / d;
*quant = (int16_t)(t - (1 << 16));
*shift = 1 << (16 - l);
}
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++) {
const int qzbin_factor = q == 0 ? 64 : (vp9_dc_quant(q, 0) < 148 ? 84 : 80);
const int qrounding_factor = q == 0 ? 64 : 48;
for (i = 0; i < 2; ++i) {
// y
quant = i == 0 ? vp9_dc_quant(q, cm->y_dc_delta_q)
: vp9_ac_quant(q, 0);
invert_quant(&quants->y_quant[q][i], &quants->y_quant_shift[q][i], quant);
quants->y_zbin[q][i] = ROUND_POWER_OF_TWO(qzbin_factor * quant, 7);
quants->y_round[q][i] = (qrounding_factor * quant) >> 7;
cm->y_dequant[q][i] = quant;
// uv
quant = i == 0 ? vp9_dc_quant(q, cm->uv_dc_delta_q)
: vp9_ac_quant(q, cm->uv_ac_delta_q);
invert_quant(&quants->uv_quant[q][i],
&quants->uv_quant_shift[q][i], quant);
quants->uv_zbin[q][i] = ROUND_POWER_OF_TWO(qzbin_factor * quant, 7);
quants->uv_round[q][i] = (qrounding_factor * quant) >> 7;
cm->uv_dequant[q][i] = quant;
#if CONFIG_ALPHA
// alpha
quant = i == 0 ? vp9_dc_quant(q, cm->a_dc_delta_q)
: vp9_ac_quant(q, cm->a_ac_delta_q);
invert_quant(&quants->a_quant[q][i], &quants->a_quant_shift[q][i], quant);
quants->a_zbin[q][i] = ROUND_POWER_OF_TWO(qzbin_factor * quant, 7);
quants->a_round[q][i] = (qrounding_factor * quant) >> 7;
cm->a_dequant[q][i] = quant;
#endif
}
for (i = 2; i < 8; i++) {
quants->y_quant[q][i] = quants->y_quant[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];
cm->y_dequant[q][i] = cm->y_dequant[q][1];
quants->uv_quant[q][i] = quants->uv_quant[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];
cm->uv_dequant[q][i] = cm->uv_dequant[q][1];
#if CONFIG_ALPHA
quants->a_quant[q][i] = quants->a_quant[q][1];
quants->a_quant_shift[q][i] = quants->a_quant_shift[q][1];
quants->a_zbin[q][i] = quants->a_zbin[q][1];
quants->a_round[q][i] = quants->a_round[q][1];
cm->a_dequant[q][i] = cm->a_dequant[q][1];
#endif
}
}
}
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]->mbmi.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);
const int zbin = cpi->zbin_mode_boost;
int i;
// Y
x->plane[0].quant = quants->y_quant[qindex];
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];
x->plane[0].zbin_extra = (int16_t)((cm->y_dequant[qindex][1] * zbin) >> 7);
xd->plane[0].dequant = cm->y_dequant[qindex];
// UV
for (i = 1; i < 3; i++) {
x->plane[i].quant = quants->uv_quant[qindex];
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];
x->plane[i].zbin_extra = (int16_t)((cm->uv_dequant[qindex][1] * zbin) >> 7);
xd->plane[i].dequant = cm->uv_dequant[qindex];
}
#if CONFIG_ALPHA
x->plane[3].quant = quants->a_quant[qindex];
x->plane[3].quant_shift = quants->a_quant_shift[qindex];
x->plane[3].zbin = quants->a_zbin[qindex];
x->plane[3].round = quants->a_round[qindex];
x->plane[3].zbin_extra = (int16_t)((cm->a_dequant[qindex][1] * zbin) >> 7);
xd->plane[3].dequant = cm->a_dequant[qindex];
#endif
x->skip_block = vp9_segfeature_active(&cm->seg, segment_id, SEG_LVL_SKIP);
x->q_index = qindex;
x->errorperbit = rdmult >> 6;
x->errorperbit += (x->errorperbit == 0);
vp9_initialize_me_consts(cpi, x->q_index);
}
void vp9_update_zbin_extra(VP9_COMP *cpi, MACROBLOCK *x) {
const int qindex = x->q_index;
const int y_zbin_extra = (cpi->common.y_dequant[qindex][1] *
cpi->zbin_mode_boost) >> 7;
const int uv_zbin_extra = (cpi->common.uv_dequant[qindex][1] *
cpi->zbin_mode_boost) >> 7;
x->plane[0].zbin_extra = (int16_t)y_zbin_extra;
x->plane[1].zbin_extra = (int16_t)uv_zbin_extra;
x->plane[2].zbin_extra = (int16_t)uv_zbin_extra;
}
void vp9_frame_init_quantizer(VP9_COMP *cpi) {
cpi->zbin_mode_boost = 0;
vp9_init_plane_quantizers(cpi, &cpi->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;
}