ref: 2157d613c56095de9ec442376b6386ba9fc0e584
dir: libvpx/vp8/encoder/vp8_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 "vp8/encoder/quantize.h"
#include "vp8/common/quant_common.h"
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;
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 = (char)(eob + 1);
}
void vp8_regular_quantize_b_c(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 *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;
memset(qcoeff_ptr, 0, 32);
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] + *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]) >>
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; /* reset zero runlength */
}
}
}
*d->eob = (char)(eob + 1);
}
void vp8_quantize_mby(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(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(MACROBLOCK *x) {
int i;
for (i = 16; i < 24; ++i) x->quantize_b(&x->block[i], &x->e_mbd.block[i]);
}
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
};
static void invert_quant(int improved_quant, short *quant, short *shift,
short d) {
if (improved_quant) {
unsigned t;
int l, m;
t = d;
for (l = 0; t > 1; ++l) t >>= 1;
m = 1 + (1 << (16 + l)) / d;
*quant = (short)(m - (1 << 16));
*shift = l;
/* use multiplication and constant shift by 16 */
*shift = 1 << (16 - *shift);
} 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 = ; */
quant_val = vp8_ac_yquant(Q);
cpi->Y1quant_fast[Q][1] = (1 << 16) / quant_val;
invert_quant(cpi->sf.improved_quant, cpi->Y1quant[Q] + 1,
cpi->Y1quant_shift[Q] + 1, quant_val);
cpi->Y1zbin[Q][1] = ((qzbin_factors[Q] * quant_val) + 64) >> 7;
cpi->Y1round[Q][1] = (qrounding_factors[Q] * quant_val) >> 7;
cpi->common.Y1dequant[Q][1] = quant_val;
cpi->zrun_zbin_boost_y1[Q][1] = (quant_val * zbin_boost[1]) >> 7;
quant_val = vp8_ac2quant(Q, cpi->common.y2ac_delta_q);
cpi->Y2quant_fast[Q][1] = (1 << 16) / quant_val;
invert_quant(cpi->sf.improved_quant, cpi->Y2quant[Q] + 1,
cpi->Y2quant_shift[Q] + 1, quant_val);
cpi->Y2zbin[Q][1] = ((qzbin_factors_y2[Q] * quant_val) + 64) >> 7;
cpi->Y2round[Q][1] = (qrounding_factors_y2[Q] * quant_val) >> 7;
cpi->common.Y2dequant[Q][1] = quant_val;
cpi->zrun_zbin_boost_y2[Q][1] = (quant_val * zbin_boost[1]) >> 7;
quant_val = vp8_ac_uv_quant(Q, cpi->common.uvac_delta_q);
cpi->UVquant_fast[Q][1] = (1 << 16) / quant_val;
invert_quant(cpi->sf.improved_quant, cpi->UVquant[Q] + 1,
cpi->UVquant_shift[Q] + 1, quant_val);
cpi->UVzbin[Q][1] = ((qzbin_factors[Q] * quant_val) + 64) >> 7;
cpi->UVround[Q][1] = (qrounding_factors[Q] * quant_val) >> 7;
cpi->common.UVdequant[Q][1] = quant_val;
cpi->zrun_zbin_boost_uv[Q][1] = (quant_val * zbin_boost[1]) >> 7;
for (i = 2; i < 16; ++i) {
cpi->Y1quant_fast[Q][i] = cpi->Y1quant_fast[Q][1];
cpi->Y1quant[Q][i] = cpi->Y1quant[Q][1];
cpi->Y1quant_shift[Q][i] = cpi->Y1quant_shift[Q][1];
cpi->Y1zbin[Q][i] = cpi->Y1zbin[Q][1];
cpi->Y1round[Q][i] = cpi->Y1round[Q][1];
cpi->zrun_zbin_boost_y1[Q][i] =
(cpi->common.Y1dequant[Q][1] * zbin_boost[i]) >> 7;
cpi->Y2quant_fast[Q][i] = cpi->Y2quant_fast[Q][1];
cpi->Y2quant[Q][i] = cpi->Y2quant[Q][1];
cpi->Y2quant_shift[Q][i] = cpi->Y2quant_shift[Q][1];
cpi->Y2zbin[Q][i] = cpi->Y2zbin[Q][1];
cpi->Y2round[Q][i] = cpi->Y2round[Q][1];
cpi->zrun_zbin_boost_y2[Q][i] =
(cpi->common.Y2dequant[Q][1] * zbin_boost[i]) >> 7;
cpi->UVquant_fast[Q][i] = cpi->UVquant_fast[Q][1];
cpi->UVquant[Q][i] = cpi->UVquant[Q][1];
cpi->UVquant_shift[Q][i] = cpi->UVquant_shift[Q][1];
cpi->UVzbin[Q][i] = cpi->UVzbin[Q][1];
cpi->UVround[Q][i] = cpi->UVround[Q][1];
cpi->zrun_zbin_boost_uv[Q][i] =
(cpi->common.UVdequant[Q][1] * zbin_boost[i]) >> 7;
}
}
}
#define ZBIN_EXTRA_Y \
((cpi->common.Y1dequant[QIndex][1] * \
(x->zbin_over_quant + x->zbin_mode_boost + x->act_zbin_adj)) >> \
7)
#define ZBIN_EXTRA_UV \
((cpi->common.UVdequant[QIndex][1] * \
(x->zbin_over_quant + x->zbin_mode_boost + x->act_zbin_adj)) >> \
7)
#define ZBIN_EXTRA_Y2 \
((cpi->common.Y2dequant[QIndex][1] * \
((x->zbin_over_quant / 2) + x->zbin_mode_boost + x->act_zbin_adj)) >> \
7)
void vp8cx_mb_init_quantizer(VP8_COMP *cpi, MACROBLOCK *x, int ok_to_skip) {
int i;
int QIndex;
MACROBLOCKD *xd = &x->e_mbd;
int zbin_extra;
/* Select the baseline MB Q index. */
if (xd->segmentation_enabled) {
/* Abs Value */
if (xd->mb_segement_abs_delta == SEGMENT_ABSDATA) {
QIndex = xd->segment_feature_data[MB_LVL_ALT_Q]
[xd->mode_info_context->mbmi.segment_id];
/* Delta Value */
} else {
QIndex = cpi->common.base_qindex +
xd->segment_feature_data[MB_LVL_ALT_Q]
[xd->mode_info_context->mbmi.segment_id];
/* Clamp to valid range */
QIndex = (QIndex >= 0) ? ((QIndex <= MAXQ) ? QIndex : MAXQ) : 0;
}
} else {
QIndex = cpi->common.base_qindex;
}
/* This initialization should be called at least once. Use ok_to_skip to
* decide if it is ok to skip.
* Before encoding a frame, this function is always called with ok_to_skip
* =0, which means no skiping of calculations. The "last" values are
* initialized at that time.
*/
if (!ok_to_skip || QIndex != x->q_index) {
xd->dequant_y1_dc[0] = 1;
xd->dequant_y1[0] = cpi->common.Y1dequant[QIndex][0];
xd->dequant_y2[0] = cpi->common.Y2dequant[QIndex][0];
xd->dequant_uv[0] = cpi->common.UVdequant[QIndex][0];
for (i = 1; i < 16; ++i) {
xd->dequant_y1_dc[i] = xd->dequant_y1[i] =
cpi->common.Y1dequant[QIndex][1];
xd->dequant_y2[i] = cpi->common.Y2dequant[QIndex][1];
xd->dequant_uv[i] = cpi->common.UVdequant[QIndex][1];
}
#if 1
/*TODO: Remove dequant from BLOCKD. This is a temporary solution until
* the quantizer code uses a passed in pointer to the dequant constants.
* This will also require modifications to the x86 and neon assembly.
* */
for (i = 0; i < 16; ++i) x->e_mbd.block[i].dequant = xd->dequant_y1;
for (i = 16; i < 24; ++i) x->e_mbd.block[i].dequant = xd->dequant_uv;
x->e_mbd.block[24].dequant = xd->dequant_y2;
#endif
/* Y */
zbin_extra = ZBIN_EXTRA_Y;
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->block[i].zrun_zbin_boost = cpi->zrun_zbin_boost_y1[QIndex];
x->block[i].zbin_extra = (short)zbin_extra;
}
/* UV */
zbin_extra = ZBIN_EXTRA_UV;
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->block[i].zrun_zbin_boost = cpi->zrun_zbin_boost_uv[QIndex];
x->block[i].zbin_extra = (short)zbin_extra;
}
/* Y2 */
zbin_extra = ZBIN_EXTRA_Y2;
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->block[24].zrun_zbin_boost = cpi->zrun_zbin_boost_y2[QIndex];
x->block[24].zbin_extra = (short)zbin_extra;
/* save this macroblock QIndex for vp8_update_zbin_extra() */
x->q_index = QIndex;
x->last_zbin_over_quant = x->zbin_over_quant;
x->last_zbin_mode_boost = x->zbin_mode_boost;
x->last_act_zbin_adj = x->act_zbin_adj;
} else if (x->last_zbin_over_quant != x->zbin_over_quant ||
x->last_zbin_mode_boost != x->zbin_mode_boost ||
x->last_act_zbin_adj != x->act_zbin_adj) {
/* Y */
zbin_extra = ZBIN_EXTRA_Y;
for (i = 0; i < 16; ++i) x->block[i].zbin_extra = (short)zbin_extra;
/* UV */
zbin_extra = ZBIN_EXTRA_UV;
for (i = 16; i < 24; ++i) x->block[i].zbin_extra = (short)zbin_extra;
/* Y2 */
zbin_extra = ZBIN_EXTRA_Y2;
x->block[24].zbin_extra = (short)zbin_extra;
x->last_zbin_over_quant = x->zbin_over_quant;
x->last_zbin_mode_boost = x->zbin_mode_boost;
x->last_act_zbin_adj = x->act_zbin_adj;
}
}
void vp8_update_zbin_extra(VP8_COMP *cpi, MACROBLOCK *x) {
int i;
int QIndex = x->q_index;
int zbin_extra;
/* Y */
zbin_extra = ZBIN_EXTRA_Y;
for (i = 0; i < 16; ++i) x->block[i].zbin_extra = (short)zbin_extra;
/* UV */
zbin_extra = ZBIN_EXTRA_UV;
for (i = 16; i < 24; ++i) x->block[i].zbin_extra = (short)zbin_extra;
/* Y2 */
zbin_extra = ZBIN_EXTRA_Y2;
x->block[24].zbin_extra = (short)zbin_extra;
}
#undef ZBIN_EXTRA_Y
#undef ZBIN_EXTRA_UV
#undef ZBIN_EXTRA_Y2
void vp8cx_frame_init_quantizer(VP8_COMP *cpi) {
/* Clear Zbin mode boost for default case */
cpi->mb.zbin_mode_boost = 0;
/* MB level quantizer setup */
vp8cx_mb_init_quantizer(cpi, &cpi->mb, 0);
}
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 new_uv_delta_q;
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;
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;
new_uv_delta_q = 0;
// For screen content, lower the q value for UV channel. For now, select
// conservative delta; same delta for dc and ac, and decrease it with lower
// Q, and set to 0 below some threshold. May want to condition this in
// future on the variance/energy in UV channel.
if (cpi->oxcf.screen_content_mode && Q > 40) {
new_uv_delta_q = -(int)(0.15 * Q);
// Check range: magnitude of delta is 4 bits.
if (new_uv_delta_q < -15) {
new_uv_delta_q = -15;
}
}
update |= cm->uvdc_delta_q != new_uv_delta_q;
cm->uvdc_delta_q = new_uv_delta_q;
cm->uvac_delta_q = new_uv_delta_q;
/* Set Segment specific quatizers */
mbd->segment_feature_data[MB_LVL_ALT_Q][0] =
cpi->segment_feature_data[MB_LVL_ALT_Q][0];
mbd->segment_feature_data[MB_LVL_ALT_Q][1] =
cpi->segment_feature_data[MB_LVL_ALT_Q][1];
mbd->segment_feature_data[MB_LVL_ALT_Q][2] =
cpi->segment_feature_data[MB_LVL_ALT_Q][2];
mbd->segment_feature_data[MB_LVL_ALT_Q][3] =
cpi->segment_feature_data[MB_LVL_ALT_Q][3];
/* quantizer has to be reinitialized for any delta_q changes */
if (update) vp8cx_init_quantizer(cpi);
}