ref: d8afecef715277a59841607dde01e8af79f7c7f2
dir: /vp8/encoder/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 "onyx_int.h"
#include "quantize.h"
#include "vp8/common/quant_common.h"
//#if CONFIG_SEGFEATURES
#include "vp8/common/seg_common.h"
#ifdef ENC_DEBUG
extern int enc_debug;
#endif
#define EXACT_QUANT
#ifdef EXACT_FASTQUANT
void vp8_fast_quantize_b_c(BLOCK *b, BLOCKD *d)
{
int i, rc, eob;
int zbin;
int x, y, z, sz;
short *coeff_ptr = b->coeff;
short *zbin_ptr = b->zbin;
short *round_ptr = b->round;
short *quant_ptr = b->quant_fast;
unsigned char *quant_shift_ptr = b->quant_shift;
short *qcoeff_ptr = d->qcoeff;
short *dqcoeff_ptr = d->dqcoeff;
short *dequant_ptr = d->dequant;
vpx_memset(qcoeff_ptr, 0, 32);
vpx_memset(dqcoeff_ptr, 0, 32);
eob = -1;
for (i = 0; i < 16; i++)
{
rc = vp8_default_zig_zag1d[i];
z = coeff_ptr[rc];
zbin = zbin_ptr[rc] ;
sz = (z >> 31); // sign of z
x = (z ^ sz) - sz; // x = abs(z)
if (x >= zbin)
{
x += round_ptr[rc];
y = (((x * quant_ptr[rc]) >> 16) + x)
>> quant_shift_ptr[rc]; // quantize (x)
x = (y ^ sz) - sz; // get the sign back
qcoeff_ptr[rc] = x; // write to destination
dqcoeff_ptr[rc] = x * dequant_ptr[rc]; // dequantized value
if (y)
{
eob = i; // last nonzero coeffs
}
}
}
d->eob = eob + 1;
}
#else
void vp8_fast_quantize_b_c(BLOCK *b, BLOCKD *d)
{
int i, rc, eob;
int x, y, z, sz;
short *coeff_ptr = b->coeff;
short *round_ptr = b->round;
short *quant_ptr = b->quant_fast;
short *qcoeff_ptr = d->qcoeff;
short *dqcoeff_ptr = d->dqcoeff;
short *dequant_ptr = d->dequant;
#if CONFIG_T8X8
vpx_memset(qcoeff_ptr, 0, 32);
vpx_memset(dqcoeff_ptr, 0, 32);
#endif
eob = -1;
for (i = 0; i < 16; i++)
{
rc = vp8_default_zig_zag1d[i];
z = coeff_ptr[rc];
sz = (z >> 31); // sign of z
x = (z ^ sz) - sz; // x = abs(z)
y = ((x + round_ptr[rc]) * quant_ptr[rc]) >> 16; // quantize (x)
x = (y ^ sz) - sz; // get the sign back
qcoeff_ptr[rc] = x; // write to destination
dqcoeff_ptr[rc] = x * dequant_ptr[rc]; // dequantized value
if (y)
{
eob = i; // last nonzero coeffs
}
}
d->eob = eob + 1;
}
#endif
#ifdef EXACT_QUANT
void vp8_regular_quantize_b(BLOCK *b, BLOCKD *d)
{
int i, rc, eob;
int zbin;
int x, y, z, sz;
short *zbin_boost_ptr = b->zrun_zbin_boost;
short *coeff_ptr = b->coeff;
short *zbin_ptr = b->zbin;
short *round_ptr = b->round;
short *quant_ptr = b->quant;
unsigned char *quant_shift_ptr = b->quant_shift;
short *qcoeff_ptr = d->qcoeff;
short *dqcoeff_ptr = d->dqcoeff;
short *dequant_ptr = d->dequant;
short zbin_oq_value = b->zbin_extra;
vpx_memset(qcoeff_ptr, 0, 32);
vpx_memset(dqcoeff_ptr, 0, 32);
eob = -1;
//#if CONFIG_SEGFEATURES
for (i = 0; i < b->eob_max_offset; i++)
{
rc = vp8_default_zig_zag1d[i];
z = coeff_ptr[rc];
zbin = zbin_ptr[rc] + *zbin_boost_ptr + zbin_oq_value;
zbin_boost_ptr ++;
sz = (z >> 31); // sign of z
x = (z ^ sz) - sz; // x = abs(z)
if (x >= zbin)
{
x += round_ptr[rc];
y = (((x * quant_ptr[rc]) >> 16) + x)
>> quant_shift_ptr[rc]; // quantize (x)
x = (y ^ sz) - sz; // get the sign back
qcoeff_ptr[rc] = x; // write to destination
dqcoeff_ptr[rc] = x * dequant_ptr[rc]; // dequantized value
if (y)
{
eob = i; // last nonzero coeffs
zbin_boost_ptr = b->zrun_zbin_boost; // reset zero runlength
}
}
}
d->eob = eob + 1;
}
/* Perform regular quantization, with unbiased rounding and no zero bin. */
void vp8_strict_quantize_b(BLOCK *b, BLOCKD *d)
{
int i;
int rc;
int eob;
int x;
int y;
int z;
int sz;
short *coeff_ptr;
short *quant_ptr;
unsigned char *quant_shift_ptr;
short *qcoeff_ptr;
short *dqcoeff_ptr;
short *dequant_ptr;
coeff_ptr = b->coeff;
quant_ptr = b->quant;
quant_shift_ptr = b->quant_shift;
qcoeff_ptr = d->qcoeff;
dqcoeff_ptr = d->dqcoeff;
dequant_ptr = d->dequant;
eob = - 1;
vpx_memset(qcoeff_ptr, 0, 32);
vpx_memset(dqcoeff_ptr, 0, 32);
for (i = 0; i < 16; i++)
{
int dq;
int round;
/*TODO: These arrays should be stored in zig-zag order.*/
rc = vp8_default_zig_zag1d[i];
z = coeff_ptr[rc];
dq = dequant_ptr[rc];
round = dq >> 1;
/* Sign of z. */
sz = -(z < 0);
x = (z + sz) ^ sz;
x += round;
if (x >= dq)
{
/* Quantize x. */
y = (((x * quant_ptr[rc]) >> 16) + x) >> quant_shift_ptr[rc];
/* Put the sign back. */
x = (y + sz) ^ sz;
/* Save the coefficient and its dequantized value. */
qcoeff_ptr[rc] = x;
dqcoeff_ptr[rc] = x * dq;
/* Remember the last non-zero coefficient. */
if (y)
eob = i;
}
}
d->eob = eob + 1;
}
#else
void vp8_regular_quantize_b(BLOCK *b, BLOCKD *d)
{
int i, rc, eob;
int zbin;
int x, y, z, sz;
short *zbin_boost_ptr = b->zrun_zbin_boost;
short *coeff_ptr = b->coeff;
short *zbin_ptr = b->zbin;
short *round_ptr = b->round;
short *quant_ptr = b->quant;
short *qcoeff_ptr = d->qcoeff;
short *dqcoeff_ptr = d->dqcoeff;
short *dequant_ptr = d->dequant;
short zbin_oq_value = b->zbin_extra;
vpx_memset(qcoeff_ptr, 0, 32);
vpx_memset(dqcoeff_ptr, 0, 32);
eob = -1;
for (i = 0; i < 16; i++)
{
rc = vp8_default_zig_zag1d[i];
z = coeff_ptr[rc];
//if ( i == 0 )
// zbin = zbin_ptr[rc] + *zbin_boost_ptr + zbin_oq_value/2;
//else
zbin = zbin_ptr[rc] + *zbin_boost_ptr + zbin_oq_value;
zbin_boost_ptr ++;
sz = (z >> 31); // sign of z
x = (z ^ sz) - sz; // x = abs(z)
if (x >= zbin)
{
y = ((x + round_ptr[rc]) * quant_ptr[rc]) >> 16; // quantize (x)
x = (y ^ sz) - sz; // get the sign back
qcoeff_ptr[rc] = x; // write to destination
dqcoeff_ptr[rc] = x * dequant_ptr[rc]; // dequantized value
if (y)
{
eob = i; // last nonzero coeffs
zbin_boost_ptr = &b->zrun_zbin_boost[0]; // reset zero runlength
}
}
}
d->eob = eob + 1;
}
#endif //EXACT_QUANT
void vp8_quantize_mby_c(MACROBLOCK *x)
{
int i;
int has_2nd_order = (x->e_mbd.mode_info_context->mbmi.mode != B_PRED
&& x->e_mbd.mode_info_context->mbmi.mode != SPLITMV);
for (i = 0; i < 16; i++)
x->quantize_b(&x->block[i], &x->e_mbd.block[i]);
if(has_2nd_order)
x->quantize_b(&x->block[24], &x->e_mbd.block[24]);
}
void vp8_quantize_mb_c(MACROBLOCK *x)
{
int i;
int has_2nd_order=(x->e_mbd.mode_info_context->mbmi.mode != B_PRED
&& x->e_mbd.mode_info_context->mbmi.mode != SPLITMV);
for (i = 0; i < 24+has_2nd_order; i++)
x->quantize_b(&x->block[i], &x->e_mbd.block[i]);
}
void vp8_quantize_mbuv_c(MACROBLOCK *x)
{
int i;
for (i = 16; i < 24; i++)
x->quantize_b(&x->block[i], &x->e_mbd.block[i]);
}
#if CONFIG_T8X8
#ifdef EXACT_FASTQUANT
void vp8_fast_quantize_b_2x2_c(BLOCK *b, BLOCKD *d)
{
int i, rc, eob;
int zbin;
int x, y, z, sz;
short *coeff_ptr = b->coeff;
short *zbin_ptr = b->zbin;
short *round_ptr = b->round;
short *quant_ptr = b->quant;
short *quant_shift_ptr = b->quant_shift;
short *qcoeff_ptr = d->qcoeff;
short *dqcoeff_ptr = d->dqcoeff;
short *dequant_ptr = d->dequant;
//double q2nd = 4;
vpx_memset(qcoeff_ptr, 0, 32);
vpx_memset(dqcoeff_ptr, 0, 32);
eob = -1;
for (i = 0; i < 4; i++)
{
rc = vp8_default_zig_zag1d[i];
z = coeff_ptr[rc];
//zbin = zbin_ptr[rc]/q2nd ;
zbin = zbin_ptr[rc] ;
sz = (z >> 31); // sign of z
x = (z ^ sz) - sz; // x = abs(z)
if (x >= zbin)
{
//x += (round_ptr[rc]/q2nd);
x += (round_ptr[rc]);
//y = ((int)((int)(x * quant_ptr[rc] * q2nd) >> 16) + x)
// >> quant_shift_ptr[rc]; // quantize (x)
y = ((int)((int)(x * quant_ptr[rc]) >> 16) + x)
>> quant_shift_ptr[rc]; // quantize (x)
x = (y ^ sz) - sz; // get the sign back
qcoeff_ptr[rc] = x; // write to destination
dqcoeff_ptr[rc] = x * dequant_ptr[rc]; // dequantized value
if (y)
{
eob = i; // last nonzero coeffs
}
}
}
d->eob = eob + 1;
}
void vp8_fast_quantize_b_8x8_c(BLOCK *b, BLOCKD *d)// only ac and dc difference, no difference among ac
{
int i, rc, eob;
int zbin;
int x, y, z, sz;
short *coeff_ptr = b->coeff;
short *zbin_ptr = b->zbin;
short *round_ptr = b->round;
short *quant_ptr = b->quant;
short *quant_shift_ptr = b->quant_shift;
short *qcoeff_ptr = d->qcoeff;
short *dqcoeff_ptr = d->dqcoeff;
short *dequant_ptr = d->dequant;
//double q1st = 2;
vpx_memset(qcoeff_ptr, 0, 64*sizeof(short));
vpx_memset(dqcoeff_ptr, 0, 64*sizeof(short));
eob = -1;
for (i = 0; i < 64; i++)
{
rc = vp8_default_zig_zag1d_8x8[i];
z = coeff_ptr[rc];
//zbin = zbin_ptr[rc!=0]/q1st ;
zbin = zbin_ptr[rc!=0] ;
sz = (z >> 31); // sign of z
x = (z ^ sz) - sz; // x = abs(z)
if (x >= zbin)
{
//x += round_ptr[rc]/q1st;
//y = ((int)(((int)((x * quant_ptr[rc!=0] * q1st)) >> 16) + x))
// >> quant_shift_ptr[rc!=0]; // quantize (x)
x += round_ptr[rc];
y = ((int)(((int)((x * quant_ptr[rc!=0])) >> 16) + x))
>> quant_shift_ptr[rc!=0]; // quantize (x)
x = (y ^ sz) - sz; // get the sign back
qcoeff_ptr[rc] = x; // write to destination
//dqcoeff_ptr[rc] = x * dequant_ptr[rc!=0] / q1st; // dequantized value
dqcoeff_ptr[rc] = x * dequant_ptr[rc!=0]; // dequantized value
if (y)
{
eob = i; // last nonzero coeffs
}
}
}
d->eob = eob + 1;
}
#else
void vp8_fast_quantize_b_2x2_c(BLOCK *b, BLOCKD *d)
{
int i, rc, eob;
int zbin;
int x, y, z, sz;
short *coeff_ptr = b->coeff;
short *zbin_ptr = b->zbin;
short *round_ptr = b->round;
short *quant_ptr = b->quant;
short *qcoeff_ptr = d->qcoeff;
short *dqcoeff_ptr = d->dqcoeff;
short *dequant_ptr = d->dequant;
//double q2nd = 4;
vpx_memset(qcoeff_ptr, 0, 32);
vpx_memset(dqcoeff_ptr, 0, 32);
eob = -1;
for (i = 0; i < 4; i++)
{
rc = vp8_default_zig_zag1d[i];
z = coeff_ptr[rc];
//zbin = zbin_ptr[rc]/q2nd;
zbin = zbin_ptr[rc];
sz = (z >> 31); // sign of z
x = (z ^ sz) - sz; // x = abs(z)
if (x >= zbin)
{
//y = ((int)((x + round_ptr[rc]/q2nd) * quant_ptr[rc] * q2nd)) >> 16; // quantize (x)
y = ((int)((x + round_ptr[rc]) * quant_ptr[rc])) >> 16; // quantize (x)
x = (y ^ sz) - sz; // get the sign back
qcoeff_ptr[rc] = x; // write to destination
//dqcoeff_ptr[rc] = x * dequant_ptr[rc] / q2nd; // dequantized value
dqcoeff_ptr[rc] = x * dequant_ptr[rc]; // dequantized value
if (y)
{
eob = i; // last nonzero coeffs
}
}
}
d->eob = eob + 1;
//if (d->eob > 4) printf("Flag Fast 2 (%d)\n", d->eob);
}
void vp8_fast_quantize_b_8x8_c(BLOCK *b, BLOCKD *d)
{
int i, rc, eob;
int zbin;
int x, y, z, sz;
short *coeff_ptr = b->coeff;
short *zbin_ptr = b->zbin;
short *round_ptr = b->round;
short *quant_ptr = b->quant;
short *qcoeff_ptr = d->qcoeff;
short *dqcoeff_ptr = d->dqcoeff;
short *dequant_ptr = d->dequant;
//double q1st = 2;
vpx_memset(qcoeff_ptr, 0, 64*sizeof(short));
vpx_memset(dqcoeff_ptr, 0, 64*sizeof(short));
eob = -1;
for (i = 0; i < 64; i++)
{
rc = vp8_default_zig_zag1d_8x8[i];
z = coeff_ptr[rc];
//zbin = zbin_ptr[rc!=0]/q1st ;
zbin = zbin_ptr[rc!=0] ;
sz = (z >> 31); // sign of z
x = (z ^ sz) - sz; // x = abs(z)
if (x >= zbin)
{
//y = ((int)((x + round_ptr[rc!=0] / q1st) * quant_ptr[rc!=0] * q1st)) >> 16;
y = ((int)((x + round_ptr[rc!=0]) * quant_ptr[rc!=0])) >> 16;
x = (y ^ sz) - sz; // get the sign back
qcoeff_ptr[rc] = x; // write to destination
//dqcoeff_ptr[rc] = x * dequant_ptr[rc!=0] / q1st; // dequantized value
dqcoeff_ptr[rc] = x * dequant_ptr[rc!=0]; // dequantized value
if (y)
{
eob = i; // last nonzero coeffs
}
}
}
d->eob = eob + 1;
}
#endif //EXACT_FASTQUANT
#ifdef EXACT_QUANT
void vp8_regular_quantize_b_2x2(BLOCK *b, BLOCKD *d)
{
int i, rc, eob;
int zbin;
int x, y, z, sz;
short *zbin_boost_ptr = b->zrun_zbin_boost;
short *coeff_ptr = b->coeff;
short *zbin_ptr = b->zbin;
short *round_ptr = b->round;
short *quant_ptr = b->quant;
unsigned char *quant_shift_ptr = b->quant_shift;
short *qcoeff_ptr = d->qcoeff;
short *dqcoeff_ptr = d->dqcoeff;
short *dequant_ptr = d->dequant;
short zbin_oq_value = b->zbin_extra;
//double q2nd = 4;
vpx_memset(qcoeff_ptr, 0, 32);
vpx_memset(dqcoeff_ptr, 0, 32);
eob = -1;
for (i = 0; i < 4; i++)
{
rc = vp8_default_zig_zag1d[i];
z = coeff_ptr[rc];
//zbin = (zbin_ptr[rc] + *zbin_boost_ptr + zbin_oq_value)/q2nd;
zbin = (zbin_ptr[rc] + *zbin_boost_ptr + zbin_oq_value);
zbin_boost_ptr ++;
sz = (z >> 31); // sign of z
x = (z ^ sz) - sz; // x = abs(z)
if (x >= zbin)
{
//x += (round_ptr[rc]/q2nd);
x += (round_ptr[rc]);
y = ((int)((int)(x * quant_ptr[rc]) >> 16) + x)
>> quant_shift_ptr[rc]; // quantize (x)
x = (y ^ sz) - sz; // get the sign back
qcoeff_ptr[rc] = x; // write to destination
//dqcoeff_ptr[rc] = x * dequant_ptr[rc]/q2nd; // dequantized value
dqcoeff_ptr[rc] = x * dequant_ptr[rc]; // dequantized value
if (y)
{
eob = i; // last nonzero coeffs
zbin_boost_ptr = &b->zrun_zbin_boost[0]; // reset zero runlength
}
}
}
d->eob = eob + 1;
}
void vp8_regular_quantize_b_8x8(BLOCK *b, BLOCKD *d)
{
int i, rc, eob;
int zbin;
int x, y, z, sz;
short *zbin_boost_ptr = b->zrun_zbin_boost;
short *coeff_ptr = b->coeff;
short *zbin_ptr = b->zbin;
short *round_ptr = b->round;
short *quant_ptr = b->quant;
unsigned char *quant_shift_ptr = b->quant_shift;
short *qcoeff_ptr = d->qcoeff;
short *dqcoeff_ptr = d->dqcoeff;
short *dequant_ptr = d->dequant;
short zbin_oq_value = b->zbin_extra;
//double q1st = 2;
vpx_memset(qcoeff_ptr, 0, 64*sizeof(short));
vpx_memset(dqcoeff_ptr, 0, 64*sizeof(short));
eob = -1;
for (i = 0; i < 64; i++)
{
rc = vp8_default_zig_zag1d_8x8[i];
z = coeff_ptr[rc];
//zbin = (zbin_ptr[rc!=0] + *zbin_boost_ptr + zbin_oq_value)/q1st;
zbin = (zbin_ptr[rc!=0] + *zbin_boost_ptr + zbin_oq_value);
zbin_boost_ptr ++;
sz = (z >> 31); // sign of z
x = (z ^ sz) - sz; // x = abs(z)
if (x >= zbin)
{
//x += (round_ptr[rc!=0]/q1st);
//y = ((int)(((int)(x * quant_ptr[rc!=0] * q1st) >> 16) + x))
// >> quant_shift_ptr[rc!=0]; // quantize (x)
x += (round_ptr[rc!=0]);
y = ((int)(((int)(x * quant_ptr[rc!=0]) >> 16) + x))
>> quant_shift_ptr[rc!=0]; // quantize (x)
x = (y ^ sz) - sz; // get the sign back
qcoeff_ptr[rc] = x; // write to destination
//dqcoeff_ptr[rc] = x * dequant_ptr[rc!=0] / q1st; // dequantized value
dqcoeff_ptr[rc] = x * dequant_ptr[rc!=0]; // dequantized value
if (y)
{
eob = i; // last nonzero coeffs
zbin_boost_ptr = &b->zrun_zbin_boost[0]; // reset zero runlength
}
}
}
d->eob = eob + 1;
}
void vp8_strict_quantize_b_2x2(BLOCK *b, BLOCKD *d)
{
int i;
int rc;
int eob;
int x;
int y;
int z;
int sz;
short *coeff_ptr;
short *quant_ptr;
unsigned char *quant_shift_ptr;
short *qcoeff_ptr;
short *dqcoeff_ptr;
short *dequant_ptr;
//double q2nd = 4;
coeff_ptr = b->coeff;
quant_ptr = b->quant;
quant_shift_ptr = b->quant_shift;
qcoeff_ptr = d->qcoeff;
dqcoeff_ptr = d->dqcoeff;
dequant_ptr = d->dequant;
eob = - 1;
vpx_memset(qcoeff_ptr, 0, 32);
vpx_memset(dqcoeff_ptr, 0, 32);
for (i = 0; i < 4; i++)
{
int dq;
int round;
/*TODO: These arrays should be stored in zig-zag order.*/
rc = vp8_default_zig_zag1d[i];
z = coeff_ptr[rc];
//z = z * q2nd;
//dq = dequant_ptr[rc]/q2nd;
dq = dequant_ptr[rc];
round = dq >> 1;
/* Sign of z. */
sz = -(z < 0);
x = (z + sz) ^ sz;
x += round;
if (x >= dq)
{
/* Quantize x */
y = (((x * quant_ptr[rc]) >> 16) + x) >> quant_shift_ptr[rc];
/* Put the sign back. */
x = (y + sz) ^ sz;
/* Save * the * coefficient and its dequantized value. */
qcoeff_ptr[rc] = x;
dqcoeff_ptr[rc] = x * dq;
/* Remember the last non-zero coefficient. */
if (y)
eob = i;
}
}
d->eob = eob + 1;
}
void vp8_strict_quantize_b_8x8(BLOCK *b, BLOCKD *d)
{
int i;
int rc;
int eob;
int x;
int y;
int z;
int sz;
short *coeff_ptr;
short *quant_ptr;
unsigned char *quant_shift_ptr;
short *qcoeff_ptr;
short *dqcoeff_ptr;
short *dequant_ptr;
//double q1st = 2;
printf("call strict quantizer\n");
coeff_ptr = b->coeff;
quant_ptr = b->quant;
quant_shift_ptr = b->quant_shift;
qcoeff_ptr = d->qcoeff;
dqcoeff_ptr = d->dqcoeff;
dequant_ptr = d->dequant;
eob = - 1;
vpx_memset(qcoeff_ptr, 0, 64*sizeof(short));
vpx_memset(dqcoeff_ptr, 0, 64*sizeof(short));
for (i = 0; i < 64; i++)
{
int dq;
int round;
/*TODO: These arrays should be stored in zig-zag order.*/
rc = vp8_default_zig_zag1d_8x8[i];
z = coeff_ptr[rc];
//z = z * q1st;
//dq = dequant_ptr[rc!=0]/q1st;
dq = dequant_ptr[rc!=0];
round = dq >> 1;
/* Sign of z. */
sz = -(z < 0);
x = (z + sz) ^ sz;
x += round;
if (x >= dq)
{
/* Quantize x. */
y = ((int)(((int)((x * quant_ptr[rc!=0])) >> 16) + x)) >> quant_shift_ptr[rc!=0];
/* Put the sign back. */
x = (y + sz) ^ sz;
/* Save the coefficient and its dequantized value. * */
qcoeff_ptr[rc] = x;
dqcoeff_ptr[rc] = x * dq;
/* Remember the last non-zero coefficient. */
if (y)
eob = i;
}
}
d->eob = eob + 1;
}
#else
void vp8_regular_quantize_b_2x2(BLOCK *b, BLOCKD *d)
{
int i, rc, eob;
int zbin;
int x, y, z, sz;
short *zbin_boost_ptr = b->zrun_zbin_boost;
short *coeff_ptr = b->coeff;
short *zbin_ptr = b->zbin;
short *round_ptr = b->round;
short *quant_ptr = b->quant;
short *qcoeff_ptr = d->qcoeff;
short *dqcoeff_ptr = d->dqcoeff;
short *dequant_ptr = d->dequant;
short zbin_oq_value = b->zbin_extra;
//double q2nd = 4;
vpx_memset(qcoeff_ptr, 0, 32);
vpx_memset(dqcoeff_ptr, 0, 32);
eob = -1;
for (i = 0; i < 4; i++)
{
rc = vp8_default_zig_zag1d[i];
z = coeff_ptr[rc];
//zbin = (zbin_ptr[rc] + *zbin_boost_ptr + zbin_oq_value)/q2nd;
zbin = (zbin_ptr[rc] + *zbin_boost_ptr + zbin_oq_value);
zbin_boost_ptr ++;
sz = (z >> 31); // sign of z
x = (z ^ sz) - sz; // x = abs(z)
if (x >= zbin)
{
//y = (((x + round_ptr[rc]/q2nd) * quant_ptr[rc]*q2nd)) >> 16; // quantize (x)
y = (((x + round_ptr[rc]) * quant_ptr[rc])) >> 16; // quantize (x)
x = (y ^ sz) - sz; // get the sign back
qcoeff_ptr[rc] = x; // write to destination
//dqcoeff_ptr[rc] = x * dequant_ptr[rc]/q2nd; // dequantized value
dqcoeff_ptr[rc] = x * dequant_ptr[rc]; // dequantized value
if (y)
{
eob = i; // last nonzero coeffs
zbin_boost_ptr = &b->zrun_zbin_boost[0]; // reset zero runlength
}
}
}
d->eob = eob + 1;
}
void vp8_regular_quantize_b_8x8(BLOCK *b, BLOCKD *d)
{
int i, rc, eob;
int zbin;
int x, y, z, sz;
short *zbin_boost_ptr = b->zrun_zbin_boost;
short *coeff_ptr = b->coeff;
short *zbin_ptr = b->zbin;
short *round_ptr = b->round;
short *quant_ptr = b->quant;
short *qcoeff_ptr = d->qcoeff;
short *dqcoeff_ptr = d->dqcoeff;
short *dequant_ptr = d->dequant;
short zbin_oq_value = b->zbin_extra;
//double q1st = 2;
vpx_memset(qcoeff_ptr, 0, 64*sizeof(short));
vpx_memset(dqcoeff_ptr, 0, 64*sizeof(short));
eob = -1;
for (i = 0; i < 64; i++)
{
rc = vp8_default_zig_zag1d_8x8[i];
z = coeff_ptr[rc];
//zbin = (zbin_ptr[rc!=0] + *zbin_boost_ptr + zbin_oq_value)/q1st;
zbin = (zbin_ptr[rc!=0] + *zbin_boost_ptr + zbin_oq_value);
zbin_boost_ptr ++;
sz = (z >> 31); // sign of z
x = (z ^ sz) - sz; // x = abs(z)
if (x >= zbin)
{
//y = ((x + round_ptr[rc!=0]/q1st) * quant_ptr[rc!=0] * q1st) >> 16;
y = ((x + round_ptr[rc!=0]) * quant_ptr[rc!=0]) >> 16;
x = (y ^ sz) - sz; // get the sign back
qcoeff_ptr[rc] = x; // write to destination
//dqcoeff_ptr[rc] = x * dequant_ptr[rc!=0]/q1st; // dequantized value
dqcoeff_ptr[rc] = x * dequant_ptr[rc!=0]; // dequantized value
if (y)
{
eob = i; // last nonzero coeffs
zbin_boost_ptr = &b->zrun_zbin_boost[0]; // reset zero runlength
}
}
}
d->eob = eob + 1;
}
#endif //EXACT_QUANT
void vp8_quantize_mby_8x8(MACROBLOCK *x)
{
int i;
int has_2nd_order=(x->e_mbd.mode_info_context->mbmi.mode != B_PRED
&& x->e_mbd.mode_info_context->mbmi.mode != SPLITMV);
for(i = 0; i < 16; i ++)
{
x->e_mbd.block[i].eob = 0;
}
x->e_mbd.block[24].eob = 0;
for (i = 0; i < 16; i+=4)
x->quantize_b_8x8(&x->block[i], &x->e_mbd.block[i]);
if (has_2nd_order)
x->quantize_b_2x2(&x->block[24], &x->e_mbd.block[24]);
}
void vp8_quantize_mb_8x8(MACROBLOCK *x)
{
int i;
int has_2nd_order=(x->e_mbd.mode_info_context->mbmi.mode != B_PRED
&& x->e_mbd.mode_info_context->mbmi.mode != SPLITMV);
for(i = 0; i < 25; i ++)
{
x->e_mbd.block[i].eob = 0;
}
for (i = 0; i < 24; i+=4)
x->quantize_b_8x8(&x->block[i], &x->e_mbd.block[i]);
if (has_2nd_order)
x->quantize_b_2x2(&x->block[24], &x->e_mbd.block[24]);
}
void vp8_quantize_mbuv_8x8(MACROBLOCK *x)
{
int i;
for(i = 16; i < 24; i ++)
{
x->e_mbd.block[i].eob = 0;
}
for (i = 16; i < 24; i+=4)
x->quantize_b_8x8(&x->block[i], &x->e_mbd.block[i]);
}
#endif //CONFIG_T8X8
/* quantize_b_pair function pointer in MACROBLOCK structure is set to one of
* these two C functions if corresponding optimized routine is not available.
* NEON optimized version implements currently the fast quantization for pair
* of blocks. */
void vp8_regular_quantize_b_pair(BLOCK *b1, BLOCK *b2, BLOCKD *d1, BLOCKD *d2)
{
vp8_regular_quantize_b(b1, d1);
vp8_regular_quantize_b(b2, d2);
}
void vp8_fast_quantize_b_pair_c(BLOCK *b1, BLOCK *b2, BLOCKD *d1, BLOCKD *d2)
{
vp8_fast_quantize_b_c(b1, d1);
vp8_fast_quantize_b_c(b2, d2);
}
static const int qrounding_factors[129] =
{
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48
};
static const int qzbin_factors[129] =
{
84, 84, 84, 84, 84, 84, 84, 84,
84, 84, 84, 84, 84, 84, 84, 84,
84, 84, 84, 84, 84, 84, 84, 84,
84, 84, 84, 84, 84, 84, 84, 84,
84, 84, 84, 84, 84, 84, 84, 84,
84, 84, 84, 84, 84, 84, 84, 84,
80, 80, 80, 80, 80, 80, 80, 80,
80, 80, 80, 80, 80, 80, 80, 80,
80, 80, 80, 80, 80, 80, 80, 80,
80, 80, 80, 80, 80, 80, 80, 80,
80, 80, 80, 80, 80, 80, 80, 80,
80, 80, 80, 80, 80, 80, 80, 80,
80, 80, 80, 80, 80, 80, 80, 80,
80, 80, 80, 80, 80, 80, 80, 80,
80, 80, 80, 80, 80, 80, 80, 80,
80, 80, 80, 80, 80, 80, 80, 80,
80
};
static const int qrounding_factors_y2[129] =
{
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48,
48
};
static const int qzbin_factors_y2[129] =
{
84, 84, 84, 84, 84, 84, 84, 84,
84, 84, 84, 84, 84, 84, 84, 84,
84, 84, 84, 84, 84, 84, 84, 84,
84, 84, 84, 84, 84, 84, 84, 84,
84, 84, 84, 84, 84, 84, 84, 84,
84, 84, 84, 84, 84, 84, 84, 84,
80, 80, 80, 80, 80, 80, 80, 80,
80, 80, 80, 80, 80, 80, 80, 80,
80, 80, 80, 80, 80, 80, 80, 80,
80, 80, 80, 80, 80, 80, 80, 80,
80, 80, 80, 80, 80, 80, 80, 80,
80, 80, 80, 80, 80, 80, 80, 80,
80, 80, 80, 80, 80, 80, 80, 80,
80, 80, 80, 80, 80, 80, 80, 80,
80, 80, 80, 80, 80, 80, 80, 80,
80, 80, 80, 80, 80, 80, 80, 80,
80
};
#define EXACT_QUANT
#ifdef EXACT_QUANT
static void invert_quant(int improved_quant, short *quant,
unsigned char *shift, short d)
{
if(improved_quant)
{
unsigned t;
int l;
t = d;
for(l = 0; t > 1; l++)
t>>=1;
t = 1 + (1<<(16+l))/d;
*quant = (short)(t - (1<<16));
*shift = l;
}
else
{
*quant = (1 << 16) / d;
*shift = 0;
}
}
void vp8cx_init_quantizer(VP8_COMP *cpi)
{
int i;
int quant_val;
int Q;
int zbin_boost[16] = {0, 0, 8, 10, 12, 14, 16, 20, 24, 28, 32, 36, 40, 44, 44, 44};
for (Q = 0; Q < QINDEX_RANGE; Q++)
{
// dc values
quant_val = vp8_dc_quant(Q, cpi->common.y1dc_delta_q);
cpi->Y1quant_fast[Q][0] = (1 << 16) / quant_val;
invert_quant(cpi->sf.improved_quant, cpi->Y1quant[Q] + 0,
cpi->Y1quant_shift[Q] + 0, quant_val);
cpi->Y1zbin[Q][0] = ((qzbin_factors[Q] * quant_val) + 64) >> 7;
cpi->Y1round[Q][0] = (qrounding_factors[Q] * quant_val) >> 7;
cpi->common.Y1dequant[Q][0] = quant_val;
cpi->zrun_zbin_boost_y1[Q][0] = (quant_val * zbin_boost[0]) >> 7;
quant_val = vp8_dc2quant(Q, cpi->common.y2dc_delta_q);
cpi->Y2quant_fast[Q][0] = (1 << 16) / quant_val;
invert_quant(cpi->sf.improved_quant, cpi->Y2quant[Q] + 0,
cpi->Y2quant_shift[Q] + 0, quant_val);
cpi->Y2zbin[Q][0] = ((qzbin_factors_y2[Q] * quant_val) + 64) >> 7;
cpi->Y2round[Q][0] = (qrounding_factors_y2[Q] * quant_val) >> 7;
cpi->common.Y2dequant[Q][0] = quant_val;
cpi->zrun_zbin_boost_y2[Q][0] = (quant_val * zbin_boost[0]) >> 7;
quant_val = vp8_dc_uv_quant(Q, cpi->common.uvdc_delta_q);
cpi->UVquant_fast[Q][0] = (1 << 16) / quant_val;
invert_quant(cpi->sf.improved_quant, cpi->UVquant[Q] + 0,
cpi->UVquant_shift[Q] + 0, quant_val);
cpi->UVzbin[Q][0] = ((qzbin_factors[Q] * quant_val) + 64) >> 7;;
cpi->UVround[Q][0] = (qrounding_factors[Q] * quant_val) >> 7;
cpi->common.UVdequant[Q][0] = quant_val;
cpi->zrun_zbin_boost_uv[Q][0] = (quant_val * zbin_boost[0]) >> 7;
// all the ac values = ;
for (i = 1; i < 16; i++)
{
int rc = vp8_default_zig_zag1d[i];
quant_val = vp8_ac_yquant(Q);
cpi->Y1quant_fast[Q][rc] = (1 << 16) / quant_val;
invert_quant(cpi->sf.improved_quant, cpi->Y1quant[Q] + rc,
cpi->Y1quant_shift[Q] + rc, quant_val);
cpi->Y1zbin[Q][rc] = ((qzbin_factors[Q] * quant_val) + 64) >> 7;
cpi->Y1round[Q][rc] = (qrounding_factors[Q] * quant_val) >> 7;
cpi->common.Y1dequant[Q][rc] = quant_val;
cpi->zrun_zbin_boost_y1[Q][i] = (quant_val * zbin_boost[i]) >> 7;
quant_val = vp8_ac2quant(Q, cpi->common.y2ac_delta_q);
cpi->Y2quant_fast[Q][rc] = (1 << 16) / quant_val;
invert_quant(cpi->sf.improved_quant, cpi->Y2quant[Q] + rc,
cpi->Y2quant_shift[Q] + rc, quant_val);
cpi->Y2zbin[Q][rc] = ((qzbin_factors_y2[Q] * quant_val) + 64) >> 7;
cpi->Y2round[Q][rc] = (qrounding_factors_y2[Q] * quant_val) >> 7;
cpi->common.Y2dequant[Q][rc] = quant_val;
cpi->zrun_zbin_boost_y2[Q][i] = (quant_val * zbin_boost[i]) >> 7;
quant_val = vp8_ac_uv_quant(Q, cpi->common.uvac_delta_q);
cpi->UVquant_fast[Q][rc] = (1 << 16) / quant_val;
invert_quant(cpi->sf.improved_quant, cpi->UVquant[Q] + rc,
cpi->UVquant_shift[Q] + rc, quant_val);
cpi->UVzbin[Q][rc] = ((qzbin_factors[Q] * quant_val) + 64) >> 7;
cpi->UVround[Q][rc] = (qrounding_factors[Q] * quant_val) >> 7;
cpi->common.UVdequant[Q][rc] = quant_val;
cpi->zrun_zbin_boost_uv[Q][i] = (quant_val * zbin_boost[i]) >> 7;
}
}
}
#else
void vp8cx_init_quantizer(VP8_COMP *cpi)
{
int i;
int quant_val;
int Q;
int zbin_boost[16] = {0, 0, 8, 10, 12, 14, 16, 20, 24, 28, 32, 36, 40, 44, 44, 44};
for (Q = 0; Q < QINDEX_RANGE; Q++)
{
// dc values
quant_val = vp8_dc_quant(Q, cpi->common.y1dc_delta_q);
cpi->Y1quant[Q][0] = (1 << 16) / quant_val;
cpi->Y1zbin[Q][0] = ((qzbin_factors[Q] * quant_val) + 64) >> 7;
cpi->Y1round[Q][0] = (qrounding_factors[Q] * quant_val) >> 7;
cpi->common.Y1dequant[Q][0] = quant_val;
cpi->zrun_zbin_boost_y1[Q][0] = (quant_val * zbin_boost[0]) >> 7;
quant_val = vp8_dc2quant(Q, cpi->common.y2dc_delta_q);
cpi->Y2quant[Q][0] = (1 << 16) / quant_val;
cpi->Y2zbin[Q][0] = ((qzbin_factors_y2[Q] * quant_val) + 64) >> 7;
cpi->Y2round[Q][0] = (qrounding_factors_y2[Q] * quant_val) >> 7;
cpi->common.Y2dequant[Q][0] = quant_val;
cpi->zrun_zbin_boost_y2[Q][0] = (quant_val * zbin_boost[0]) >> 7;
quant_val = vp8_dc_uv_quant(Q, cpi->common.uvdc_delta_q);
cpi->UVquant[Q][0] = (1 << 16) / quant_val;
cpi->UVzbin[Q][0] = ((qzbin_factors[Q] * quant_val) + 64) >> 7;;
cpi->UVround[Q][0] = (qrounding_factors[Q] * quant_val) >> 7;
cpi->common.UVdequant[Q][0] = quant_val;
cpi->zrun_zbin_boost_uv[Q][0] = (quant_val * zbin_boost[0]) >> 7;
// all the ac values = ;
for (i = 1; i < 16; i++)
{
int rc = vp8_default_zig_zag1d[i];
quant_val = vp8_ac_yquant(Q);
cpi->Y1quant[Q][rc] = (1 << 16) / quant_val;
cpi->Y1zbin[Q][rc] = ((qzbin_factors[Q] * quant_val) + 64) >> 7;
cpi->Y1round[Q][rc] = (qrounding_factors[Q] * quant_val) >> 7;
cpi->common.Y1dequant[Q][rc] = quant_val;
cpi->zrun_zbin_boost_y1[Q][i] = (quant_val * zbin_boost[i]) >> 7;
quant_val = vp8_ac2quant(Q, cpi->common.y2ac_delta_q);
cpi->Y2quant[Q][rc] = (1 << 16) / quant_val;
cpi->Y2zbin[Q][rc] = ((qzbin_factors_y2[Q] * quant_val) + 64) >> 7;
cpi->Y2round[Q][rc] = (qrounding_factors_y2[Q] * quant_val) >> 7;
cpi->common.Y2dequant[Q][rc] = quant_val;
cpi->zrun_zbin_boost_y2[Q][i] = (quant_val * zbin_boost[i]) >> 7;
quant_val = vp8_ac_uv_quant(Q, cpi->common.uvac_delta_q);
cpi->UVquant[Q][rc] = (1 << 16) / quant_val;
cpi->UVzbin[Q][rc] = ((qzbin_factors[Q] * quant_val) + 64) >> 7;
cpi->UVround[Q][rc] = (qrounding_factors[Q] * quant_val) >> 7;
cpi->common.UVdequant[Q][rc] = quant_val;
cpi->zrun_zbin_boost_uv[Q][i] = (quant_val * zbin_boost[i]) >> 7;
}
}
}
#endif
void vp8cx_mb_init_quantizer(VP8_COMP *cpi, MACROBLOCK *x)
{
int i;
int QIndex;
MACROBLOCKD *xd = &x->e_mbd;
int zbin_extra;
int segment_id = xd->mode_info_context->mbmi.segment_id;
// Select the baseline MB Q index allowing for any segment level change.
//#if CONFIG_SEGFEATURES
if ( segfeature_active( xd, segment_id, SEG_LVL_ALT_Q ) )
{
// Abs Value
if (xd->mb_segement_abs_delta == SEGMENT_ABSDATA)
QIndex = xd->segment_feature_data[segment_id][SEG_LVL_ALT_Q];
// Delta Value
else
{
QIndex = cpi->common.base_qindex +
xd->segment_feature_data[segment_id][SEG_LVL_ALT_Q];
// Clamp to valid range
QIndex = (QIndex >= 0) ? ((QIndex <= MAXQ) ? QIndex : MAXQ) : 0;
}
}
else
QIndex = cpi->common.base_qindex;
// Y
zbin_extra = ( cpi->common.Y1dequant[QIndex][1] *
( cpi->zbin_over_quant +
cpi->zbin_mode_boost +
x->act_zbin_adj ) ) >> 7;
for (i = 0; i < 16; i++)
{
x->block[i].quant = cpi->Y1quant[QIndex];
x->block[i].quant_fast = cpi->Y1quant_fast[QIndex];
x->block[i].quant_shift = cpi->Y1quant_shift[QIndex];
x->block[i].zbin = cpi->Y1zbin[QIndex];
x->block[i].round = cpi->Y1round[QIndex];
x->e_mbd.block[i].dequant = cpi->common.Y1dequant[QIndex];
x->block[i].zrun_zbin_boost = cpi->zrun_zbin_boost_y1[QIndex];
x->block[i].zbin_extra = (short)zbin_extra;
//#if CONFIG_SEGFEATURES
// Segment max eob offset feature.
if ( segfeature_active( xd, segment_id, SEG_LVL_EOB ) )
{
x->block[i].eob_max_offset =
xd->segment_feature_data[segment_id][SEG_LVL_EOB];
}
else
x->block[i].eob_max_offset = 16;
}
// UV
zbin_extra = ( cpi->common.UVdequant[QIndex][1] *
( cpi->zbin_over_quant +
cpi->zbin_mode_boost +
x->act_zbin_adj ) ) >> 7;
for (i = 16; i < 24; i++)
{
x->block[i].quant = cpi->UVquant[QIndex];
x->block[i].quant_fast = cpi->UVquant_fast[QIndex];
x->block[i].quant_shift = cpi->UVquant_shift[QIndex];
x->block[i].zbin = cpi->UVzbin[QIndex];
x->block[i].round = cpi->UVround[QIndex];
x->e_mbd.block[i].dequant = cpi->common.UVdequant[QIndex];
x->block[i].zrun_zbin_boost = cpi->zrun_zbin_boost_uv[QIndex];
x->block[i].zbin_extra = (short)zbin_extra;
//#if CONFIG_SEGFEATURES
// Segment max eob offset feature.
if ( segfeature_active( xd, segment_id, SEG_LVL_EOB ) )
{
x->block[i].eob_max_offset =
xd->segment_feature_data[segment_id][SEG_LVL_EOB];
}
else
x->block[i].eob_max_offset = 16;
}
// Y2
zbin_extra = ( cpi->common.Y2dequant[QIndex][1] *
( (cpi->zbin_over_quant / 2) +
cpi->zbin_mode_boost +
x->act_zbin_adj ) ) >> 7;
x->block[24].quant_fast = cpi->Y2quant_fast[QIndex];
x->block[24].quant = cpi->Y2quant[QIndex];
x->block[24].quant_shift = cpi->Y2quant_shift[QIndex];
x->block[24].zbin = cpi->Y2zbin[QIndex];
x->block[24].round = cpi->Y2round[QIndex];
x->e_mbd.block[24].dequant = cpi->common.Y2dequant[QIndex];
x->block[24].zrun_zbin_boost = cpi->zrun_zbin_boost_y2[QIndex];
x->block[24].zbin_extra = (short)zbin_extra;
//#if CONFIG_SEGFEATURES
// TBD perhaps not use for Y2
// Segment max eob offset feature.
if ( segfeature_active( xd, segment_id, SEG_LVL_EOB ) )
{
x->block[24].eob_max_offset =
xd->segment_feature_data[segment_id][SEG_LVL_EOB];
}
else
x->block[24].eob_max_offset = 16;
/* save this macroblock QIndex for vp8_update_zbin_extra() */
x->q_index = QIndex;
}
void vp8_update_zbin_extra(VP8_COMP *cpi, MACROBLOCK *x)
{
int i;
int QIndex = x->q_index;
int zbin_extra;
// Y
zbin_extra = ( cpi->common.Y1dequant[QIndex][1] *
( cpi->zbin_over_quant +
cpi->zbin_mode_boost +
x->act_zbin_adj ) ) >> 7;
for (i = 0; i < 16; i++)
{
x->block[i].zbin_extra = (short)zbin_extra;
}
// UV
zbin_extra = ( cpi->common.UVdequant[QIndex][1] *
( cpi->zbin_over_quant +
cpi->zbin_mode_boost +
x->act_zbin_adj ) ) >> 7;
for (i = 16; i < 24; i++)
{
x->block[i].zbin_extra = (short)zbin_extra;
}
// Y2
zbin_extra = ( cpi->common.Y2dequant[QIndex][1] *
( (cpi->zbin_over_quant / 2) +
cpi->zbin_mode_boost +
x->act_zbin_adj ) ) >> 7;
x->block[24].zbin_extra = (short)zbin_extra;
}
void vp8cx_frame_init_quantizer(VP8_COMP *cpi)
{
// Clear Zbin mode boost for default case
cpi->zbin_mode_boost = 0;
// MB level quantizer setup
vp8cx_mb_init_quantizer(cpi, &cpi->mb);
}
void vp8_set_quantizer(struct VP8_COMP *cpi, int Q)
{
VP8_COMMON *cm = &cpi->common;
MACROBLOCKD *mbd = &cpi->mb.e_mbd;
int update = 0;
int new_delta_q;
int i;
cm->base_qindex = Q;
/* if any of the delta_q values are changing update flag has to be set */
/* currently only y2dc_delta_q may change */
cm->y1dc_delta_q = 0;
cm->y2ac_delta_q = 0;
cm->uvdc_delta_q = 0;
cm->uvac_delta_q = 0;
if (Q < 4)
{
new_delta_q = 4-Q;
}
else
new_delta_q = 0;
update |= cm->y2dc_delta_q != new_delta_q;
cm->y2dc_delta_q = new_delta_q;
/* quantizer has to be reinitialized for any delta_q changes */
if(update)
vp8cx_init_quantizer(cpi);
}