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aom/vp10/encoder/quantize.c

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/*
* 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_dsp_rtcd.h"
#include "vpx_dsp/quantize.h"
#include "vpx_mem/vpx_mem.h"
#include "vpx_ports/mem.h"
#include "vp10/common/quant_common.h"
#include "vp10/common/scan.h"
#include "vp10/common/seg_common.h"
#include "vp10/encoder/encoder.h"
#include "vp10/encoder/quantize.h"
#include "vp10/encoder/rd.h"
void vp10_quantize_skip(intptr_t n_coeffs, tran_low_t *qcoeff_ptr,
tran_low_t *dqcoeff_ptr, uint16_t *eob_ptr) {
memset(qcoeff_ptr, 0, n_coeffs * sizeof(*qcoeff_ptr));
memset(dqcoeff_ptr, 0, n_coeffs * sizeof(*dqcoeff_ptr));
*eob_ptr = 0;
}
void vp10_quantize_fp_facade(const tran_low_t *coeff_ptr, intptr_t n_coeffs,
const MACROBLOCK_PLANE *p, tran_low_t *qcoeff_ptr,
const MACROBLOCKD_PLANE *pd,
tran_low_t *dqcoeff_ptr, uint16_t *eob_ptr,
const scan_order *sc, const QUANT_PARAM *qparam) {
// obsolete skip_block
const int skip_block = 0;
if (qparam->log_scale == 0) {
vp10_quantize_fp(coeff_ptr, n_coeffs, skip_block, p->zbin, p->round_fp,
p->quant_fp, p->quant_shift, qcoeff_ptr, dqcoeff_ptr,
pd->dequant, eob_ptr, sc->scan, sc->iscan);
} else {
vp10_quantize_fp_32x32(coeff_ptr, n_coeffs, skip_block, p->zbin,
p->round_fp, p->quant_fp, p->quant_shift, qcoeff_ptr,
dqcoeff_ptr, pd->dequant, eob_ptr, sc->scan,
sc->iscan);
}
}
void vp10_quantize_b_facade(const tran_low_t *coeff_ptr, intptr_t n_coeffs,
const MACROBLOCK_PLANE *p, tran_low_t *qcoeff_ptr,
const MACROBLOCKD_PLANE *pd,
tran_low_t *dqcoeff_ptr, uint16_t *eob_ptr,
const scan_order *sc, const QUANT_PARAM *qparam) {
// obsolete skip_block
const int skip_block = 0;
if (qparam->log_scale == 0) {
vpx_quantize_b(coeff_ptr, n_coeffs, skip_block, p->zbin, p->round, p->quant,
p->quant_shift, qcoeff_ptr, dqcoeff_ptr, pd->dequant,
eob_ptr, sc->scan, sc->iscan);
} else {
vpx_quantize_b_32x32(coeff_ptr, n_coeffs, skip_block, p->zbin, p->round,
p->quant, p->quant_shift, qcoeff_ptr, dqcoeff_ptr,
pd->dequant, eob_ptr, sc->scan, sc->iscan);
}
}
void vp10_quantize_dc_facade(const tran_low_t *coeff_ptr, intptr_t n_coeffs,
const MACROBLOCK_PLANE *p, tran_low_t *qcoeff_ptr,
const MACROBLOCKD_PLANE *pd,
tran_low_t *dqcoeff_ptr, uint16_t *eob_ptr,
const scan_order *sc, const QUANT_PARAM *qparam) {
// obsolete skip_block
const int skip_block = 0;
(void)sc;
if (qparam->log_scale == 0) {
vpx_quantize_dc(coeff_ptr, (int)n_coeffs, skip_block, p->round,
p->quant_fp[0], qcoeff_ptr, dqcoeff_ptr, pd->dequant[0],
eob_ptr);
} else {
vpx_quantize_dc_32x32(coeff_ptr, skip_block, p->round, p->quant_fp[0],
qcoeff_ptr, dqcoeff_ptr, pd->dequant[0], eob_ptr);
}
}
#if CONFIG_VP9_HIGHBITDEPTH
void vp10_highbd_quantize_fp_facade(
const tran_low_t *coeff_ptr, intptr_t n_coeffs, const MACROBLOCK_PLANE *p,
tran_low_t *qcoeff_ptr, const MACROBLOCKD_PLANE *pd,
tran_low_t *dqcoeff_ptr, uint16_t *eob_ptr, const scan_order *sc,
const QUANT_PARAM *qparam) {
// obsolete skip_block
const int skip_block = 0;
vp10_highbd_quantize_fp(coeff_ptr, n_coeffs, skip_block, p->zbin,
p->round_fp, p->quant_fp, p->quant_shift,
qcoeff_ptr, dqcoeff_ptr, pd->dequant, eob_ptr,
sc->scan, sc->iscan, qparam->log_scale);
}
void vp10_highbd_quantize_b_facade(const tran_low_t *coeff_ptr,
intptr_t n_coeffs, const MACROBLOCK_PLANE *p,
tran_low_t *qcoeff_ptr,
const MACROBLOCKD_PLANE *pd,
tran_low_t *dqcoeff_ptr, uint16_t *eob_ptr,
const scan_order *sc,
const QUANT_PARAM *qparam) {
// obsolete skip_block
const int skip_block = 0;
vp10_highbd_quantize_b(coeff_ptr, n_coeffs, skip_block, p->zbin, p->round,
p->quant, p->quant_shift, qcoeff_ptr, dqcoeff_ptr,
pd->dequant, eob_ptr, sc->scan, sc->iscan,
qparam->log_scale);
}
void vp10_highbd_quantize_dc_facade(
const tran_low_t *coeff_ptr, intptr_t n_coeffs, const MACROBLOCK_PLANE *p,
tran_low_t *qcoeff_ptr, const MACROBLOCKD_PLANE *pd,
tran_low_t *dqcoeff_ptr, uint16_t *eob_ptr, const scan_order *sc,
const QUANT_PARAM *qparam) {
// obsolete skip_block
const int skip_block = 0;
(void)sc;
vp10_highbd_quantize_dc(coeff_ptr, (int)n_coeffs, skip_block, p->round,
p->quant_fp[0], qcoeff_ptr, dqcoeff_ptr,
pd->dequant[0], eob_ptr, qparam->log_scale);
}
#endif // CONFIG_VP9_HIGHBITDEPTH
void vp10_quantize_fp_c(const tran_low_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,
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;
// TODO(jingning) Decide the need of these arguments after the
// quantization process is completed.
(void)zbin_ptr;
(void)quant_shift_ptr;
(void)iscan;
memset(qcoeff_ptr, 0, n_coeffs * sizeof(*qcoeff_ptr));
memset(dqcoeff_ptr, 0, n_coeffs * sizeof(*dqcoeff_ptr));
if (!skip_block) {
// 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 vp10_highbd_quantize_fp_c(const tran_low_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,
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 log_scale) {
int i;
int eob = -1;
const int scale = 1 << log_scale;
const int shift = 16 - log_scale;
// TODO(jingning) Decide the need of these arguments after the
// quantization process is completed.
(void)zbin_ptr;
(void)quant_shift_ptr;
(void)iscan;
memset(qcoeff_ptr, 0, count * sizeof(*qcoeff_ptr));
memset(dqcoeff_ptr, 0, count * sizeof(*dqcoeff_ptr));
if (!skip_block) {
// Quantization pass: All coefficients with index >= zero_flag are
// skippable. Note: zero_flag can be zero.
for (i = 0; i < 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;
const int64_t tmp = abs_coeff + round_ptr[rc != 0];
const uint32_t abs_qcoeff =
(uint32_t)((tmp * quant_ptr[rc != 0]) >> shift);
qcoeff_ptr[rc] = (tran_low_t)((abs_qcoeff ^ coeff_sign) - coeff_sign);
dqcoeff_ptr[rc] = qcoeff_ptr[rc] * dequant_ptr[rc != 0] / scale;
if (abs_qcoeff)
eob = i;
}
}
*eob_ptr = eob + 1;
}
#endif
// TODO(jingning) Refactor this file and combine functions with similar
// operations.
void vp10_quantize_fp_32x32_c(const tran_low_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,
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)zbin_ptr;
(void)quant_shift_ptr;
(void)iscan;
memset(qcoeff_ptr, 0, n_coeffs * sizeof(*qcoeff_ptr));
memset(dqcoeff_ptr, 0, n_coeffs * sizeof(*dqcoeff_ptr));
if (!skip_block) {
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 vp10_highbd_quantize_b_c(const tran_low_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,
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 log_scale) {
int i, non_zero_count = (int)n_coeffs, eob = -1;
int zbins[2] = {zbin_ptr[0], zbin_ptr[1]};
int round[2] = {round_ptr[0], round_ptr[1]};
int nzbins[2];
int scale = 1;
int shift = 16;
(void)iscan;
if (log_scale > 0) {
zbins[0] = ROUND_POWER_OF_TWO(zbin_ptr[0], log_scale);
zbins[1] = ROUND_POWER_OF_TWO(zbin_ptr[1], log_scale);
round[0] = ROUND_POWER_OF_TWO(round_ptr[0], log_scale);
round[1] = ROUND_POWER_OF_TWO(round_ptr[1], log_scale);
scale = 1 << log_scale;
shift = 16 - log_scale;
}
nzbins[0] = zbins[0] * -1;
nzbins[1] = zbins[1] * -1;
memset(qcoeff_ptr, 0, n_coeffs * sizeof(*qcoeff_ptr));
memset(dqcoeff_ptr, 0, n_coeffs * sizeof(*dqcoeff_ptr));
if (!skip_block) {
// Pre-scan pass
for (i = (int)n_coeffs - 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]) {
const int64_t tmp1 = abs_coeff + round[rc != 0];
const int64_t tmp2 = ((tmp1 * quant_ptr[rc != 0]) >> 16) + tmp1;
const uint32_t abs_qcoeff =
(uint32_t)((tmp2 * quant_shift_ptr[rc != 0]) >> shift);
qcoeff_ptr[rc] = (tran_low_t)((abs_qcoeff ^ coeff_sign) - coeff_sign);
dqcoeff_ptr[rc] = qcoeff_ptr[rc] * dequant_ptr[rc != 0] / scale;
if (abs_qcoeff)
eob = i;
}
}
}
*eob_ptr = eob + 1;
}
#endif
#if CONFIG_VP9_HIGHBITDEPTH
void vp10_highbd_quantize_dc(const tran_low_t *coeff_ptr,
int n_coeffs, int skip_block,
const int16_t *round_ptr, const int16_t quant,
tran_low_t *qcoeff_ptr, tran_low_t *dqcoeff_ptr,
const int16_t dequant_ptr, uint16_t *eob_ptr,
const int log_scale) {
int eob = -1;
memset(qcoeff_ptr, 0, n_coeffs * sizeof(*qcoeff_ptr));
memset(dqcoeff_ptr, 0, n_coeffs * sizeof(*dqcoeff_ptr));
if (!skip_block) {
const int coeff = coeff_ptr[0];
const int coeff_sign = (coeff >> 31);
const int abs_coeff = (coeff ^ coeff_sign) - coeff_sign;
const int64_t tmp = abs_coeff + round_ptr[0];
const uint32_t abs_qcoeff = (uint32_t)((tmp * quant) >> (16 - log_scale));
qcoeff_ptr[0] = (tran_low_t)((abs_qcoeff ^ coeff_sign) - coeff_sign);
dqcoeff_ptr[0] = qcoeff_ptr[0] * dequant_ptr / (1 << log_scale);
if (abs_qcoeff)
eob = 0;
}
*eob_ptr = eob + 1;
}
#endif
void vp10_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];
#if CONFIG_VP9_HIGHBITDEPTH
if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
vpx_highbd_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->eobs[block],
scan, iscan);
return;
}
#endif
vpx_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->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);
}
static int get_qzbin_factor(int q, vpx_bit_depth_t bit_depth) {
const int quant = vp10_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);
case VPX_BITS_12:
return q == 0 ? 64 : (quant < 2368 ? 84 : 80);
default:
assert(0 && "bit_depth should be VPX_BITS_8, VPX_BITS_10 or VPX_BITS_12");
return -1;
}
#else
(void) bit_depth;
return q == 0 ? 64 : (quant < 148 ? 84 : 80);
#endif
}
void vp10_init_quantizer(VP10_COMP *cpi) {
VP10_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 = get_qzbin_factor(q, cm->bit_depth);
const int qrounding_factor = q == 0 ? 64 : 48;
for (i = 0; i < 2; ++i) {
int qrounding_factor_fp = i == 0 ? 48 : 42;
if (q == 0)
qrounding_factor_fp = 64;
// y
quant = i == 0 ? vp10_dc_quant(q, cm->y_dc_delta_q, cm->bit_depth)
: vp10_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 ? vp10_dc_quant(q, cm->uv_dc_delta_q, cm->bit_depth)
: vp10_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++) { // 8: SIMD width
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 vp10_init_plane_quantizers(VP10_COMP *cpi, MACROBLOCK *x) {
const VP10_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 = vp10_get_qindex(&cm->seg, segment_id, cm->base_qindex);
const int rdmult = vp10_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];
x->plane[0].round_fp = quants->y_round_fp[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];
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];
x->plane[i].round_fp = quants->uv_round_fp[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];
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);
vp10_initialize_me_consts(cpi, x, x->q_index);
}
void vp10_frame_init_quantizer(VP10_COMP *cpi) {
vp10_init_plane_quantizers(cpi, &cpi->td.mb);
}
void vp10_set_quantizer(VP10_COMMON *cm, int q) {
// quantizer has to be reinitialized with vp10_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 vp10_quantizer_to_qindex(int quantizer) {
return quantizer_to_qindex[quantizer];
}
int vp10_qindex_to_quantizer(int qindex) {
int quantizer;
for (quantizer = 0; quantizer < 64; ++quantizer)
if (quantizer_to_qindex[quantizer] >= qindex)
return quantizer;
return 63;
}
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