vp9/encoder/vp9_quantize.c - aom - Git at Google

 /*
  *  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_onyx_int.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;
   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(&cpi->y_quant[q][i], &cpi->y_quant_shift[q][i], quant);
       cpi->y_zbin[q][i] = ROUND_POWER_OF_TWO(qzbin_factor * quant, 7);
       cpi->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(&cpi->uv_quant[q][i], &cpi->uv_quant_shift[q][i], quant);
       cpi->uv_zbin[q][i] = ROUND_POWER_OF_TWO(qzbin_factor * quant, 7);
       cpi->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(&cpi->a_quant[q][i], &cpi->a_quant_shift[q][i], quant);
       cpi->a_zbin[q][i] = ROUND_POWER_OF_TWO(qzbin_factor * quant, 7);
       cpi->a_round[q][i] = (qrounding_factor * quant) >> 7;
       cm->a_dequant[q][i] = quant;
 #endif
     }

     for (i = 2; i < 8; i++) {
       cpi->y_quant[q][i] = cpi->y_quant[q][1];
       cpi->y_quant_shift[q][i] = cpi->y_quant_shift[q][1];
       cpi->y_zbin[q][i] = cpi->y_zbin[q][1];
       cpi->y_round[q][i] = cpi->y_round[q][1];
       cm->y_dequant[q][i] = cm->y_dequant[q][1];

       cpi->uv_quant[q][i] = cpi->uv_quant[q][1];
       cpi->uv_quant_shift[q][i] = cpi->uv_quant_shift[q][1];
       cpi->uv_zbin[q][i] = cpi->uv_zbin[q][1];
       cpi->uv_round[q][i] = cpi->uv_round[q][1];
       cm->uv_dequant[q][i] = cm->uv_dequant[q][1];

 #if CONFIG_ALPHA
       cpi->a_quant[q][i] = cpi->a_quant[q][1];
       cpi->a_quant_shift[q][i] = cpi->a_quant_shift[q][1];
       cpi->a_zbin[q][i] = cpi->a_zbin[q][1];
       cpi->a_round[q][i] = cpi->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 *xd = &x->e_mbd;
   const int segment_id = xd->mi_8x8[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 + x->act_zbin_adj;
   int i;

   // Y
   x->plane[0].quant = cpi->y_quant[qindex];
   x->plane[0].quant_shift = cpi->y_quant_shift[qindex];
   x->plane[0].zbin = cpi->y_zbin[qindex];
   x->plane[0].round = cpi->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 = cpi->uv_quant[qindex];
     x->plane[i].quant_shift = cpi->uv_quant_shift[qindex];
     x->plane[i].zbin = cpi->uv_zbin[qindex];
     x->plane[i].round = cpi->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 = cpi->a_quant[qindex];
   x->plane[3].quant_shift = cpi->a_quant_shift[qindex];
   x->plane[3].zbin = cpi->a_zbin[qindex];
   x->plane[3].round = cpi->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 + x->act_zbin_adj)) >> 7;
   const int uv_zbin_extra = (cpi->common.uv_dequant[qindex][1] *
                   (cpi->zbin_mode_boost + x->act_zbin_adj)) >> 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(struct VP9_COMP *cpi, int q) {
   VP9_COMMON *const cm = &cpi->common;

   // 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;
 }
	/*
	* 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_onyx_int.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;
	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(&cpi->y_quant[q][i], &cpi->y_quant_shift[q][i], quant);
	cpi->y_zbin[q][i] = ROUND_POWER_OF_TWO(qzbin_factor * quant, 7);
	cpi->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(&cpi->uv_quant[q][i], &cpi->uv_quant_shift[q][i], quant);
	cpi->uv_zbin[q][i] = ROUND_POWER_OF_TWO(qzbin_factor * quant, 7);
	cpi->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(&cpi->a_quant[q][i], &cpi->a_quant_shift[q][i], quant);
	cpi->a_zbin[q][i] = ROUND_POWER_OF_TWO(qzbin_factor * quant, 7);
	cpi->a_round[q][i] = (qrounding_factor * quant) >> 7;
	cm->a_dequant[q][i] = quant;
	#endif
	}

	for (i = 2; i < 8; i++) {
	cpi->y_quant[q][i] = cpi->y_quant[q][1];
	cpi->y_quant_shift[q][i] = cpi->y_quant_shift[q][1];
	cpi->y_zbin[q][i] = cpi->y_zbin[q][1];
	cpi->y_round[q][i] = cpi->y_round[q][1];
	cm->y_dequant[q][i] = cm->y_dequant[q][1];

	cpi->uv_quant[q][i] = cpi->uv_quant[q][1];
	cpi->uv_quant_shift[q][i] = cpi->uv_quant_shift[q][1];
	cpi->uv_zbin[q][i] = cpi->uv_zbin[q][1];
	cpi->uv_round[q][i] = cpi->uv_round[q][1];
	cm->uv_dequant[q][i] = cm->uv_dequant[q][1];

	#if CONFIG_ALPHA
	cpi->a_quant[q][i] = cpi->a_quant[q][1];
	cpi->a_quant_shift[q][i] = cpi->a_quant_shift[q][1];
	cpi->a_zbin[q][i] = cpi->a_zbin[q][1];
	cpi->a_round[q][i] = cpi->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 *xd = &x->e_mbd;
	const int segment_id = xd->mi_8x8[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 + x->act_zbin_adj;
	int i;

	// Y
	x->plane[0].quant = cpi->y_quant[qindex];
	x->plane[0].quant_shift = cpi->y_quant_shift[qindex];
	x->plane[0].zbin = cpi->y_zbin[qindex];
	x->plane[0].round = cpi->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 = cpi->uv_quant[qindex];
	x->plane[i].quant_shift = cpi->uv_quant_shift[qindex];
	x->plane[i].zbin = cpi->uv_zbin[qindex];
	x->plane[i].round = cpi->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 = cpi->a_quant[qindex];
	x->plane[3].quant_shift = cpi->a_quant_shift[qindex];
	x->plane[3].zbin = cpi->a_zbin[qindex];
	x->plane[3].round = cpi->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 + x->act_zbin_adj)) >> 7;
	const int uv_zbin_extra = (cpi->common.uv_dequant[qindex][1] *
	(cpi->zbin_mode_boost + x->act_zbin_adj)) >> 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(struct VP9_COMP *cpi, int q) {
	VP9_COMMON *const cm = &cpi->common;

	// 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;
	}