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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_mem/vpx_mem.h"

 #include "vp9/encoder/vp9_onyx_int.h"

 #include "vp9/encoder/vp9_rdopt.h"

 #include "vp9/encoder/vp9_quantize.h"

 #include "vp9/common/vp9_quant_common.h"

 #include "vp9/common/vp9_seg_common.h"

 #ifdef ENC_DEBUG

 extern int enc_debug;

 #endif

 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 = 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 = 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) {

   int i, rc, eob;

   int zbins[2], nzbins[2];

   int x, y, z, sz;

   int idx = 0;

   int idx_arr[1024];

   vpx_memset(qcoeff_ptr, 0, n_coeffs*sizeof(int16_t));

   vpx_memset(dqcoeff_ptr, 0, n_coeffs*sizeof(int16_t));

   eob = -1;

   // Base ZBIN

   zbins[0] = ROUND_POWER_OF_TWO(zbin_ptr[0] + zbin_oq_value, 1);

   zbins[1] = ROUND_POWER_OF_TWO(zbin_ptr[1] + zbin_oq_value, 1);

   nzbins[0] = zbins[0] * -1;

   nzbins[1] = zbins[1] * -1;

   if (!skip_block) {

     // Pre-scan pass

     for (i = 0; i < n_coeffs; i++) {

       rc = scan[i];

       z = coeff_ptr[rc];

       // If the coefficient is out of the base ZBIN range, keep it for

       // quantization.

       if (z >= zbins[rc != 0] || z <= 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++) {

       rc = scan[idx_arr[i]];

       z = coeff_ptr[rc];

       sz = (z >> 31);                               // sign of z

       x  = (z ^ sz) - sz;                           // x = abs(z)

       x += ROUND_POWER_OF_TWO(round_ptr[rc != 0], 1);

       x  = clamp(x, INT16_MIN, INT16_MAX);

       y  = ((((x * quant_ptr[rc != 0]) >> 16) + x) *

             quant_shift_ptr[rc != 0]) >> 15;      // 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] / 2;  // dequantized value

       if (y)

         eob = idx_arr[i];                         // last nonzero coeffs

     }

   }

   *eob_ptr = eob + 1;

 }

 struct plane_block_idx {

   int plane;

   int block;

 };

 // TODO(jkoleszar): returning a struct so it can be used in a const context,

 // expect to refactor this further later.

 static INLINE struct plane_block_idx plane_block_idx(int y_blocks,

                                                      int b_idx) {

   const int v_offset = y_blocks * 5 / 4;

   struct plane_block_idx res;

   if (b_idx < y_blocks) {

     res.plane = 0;

     res.block = b_idx;

   } else if (b_idx < v_offset) {

     res.plane = 1;

     res.block = b_idx - y_blocks;

   } else {

     assert(b_idx < y_blocks * 3 / 2);

     res.plane = 2;

     res.block = b_idx - v_offset;

   }

   return res;

 }

 void vp9_regular_quantize_b_4x4(MACROBLOCK *x, int y_blocks, int b_idx,

                                 const int16_t *scan, const int16_t *iscan) {

   MACROBLOCKD *const xd = &x->e_mbd;

   const struct plane_block_idx pb_idx = plane_block_idx(y_blocks, b_idx);

   struct macroblock_plane* p = &x->plane[pb_idx.plane];

   struct macroblockd_plane* pd = &xd->plane[pb_idx.plane];

   vp9_quantize_b(BLOCK_OFFSET(p->coeff, pb_idx.block),

            16, x->skip_block,

            p->zbin, p->round, p->quant, p->quant_shift,

            BLOCK_OFFSET(pd->qcoeff, pb_idx.block),

            BLOCK_OFFSET(pd->dqcoeff, pb_idx.block),

            pd->dequant, p->zbin_extra, &pd->eobs[pb_idx.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) {

   int i, q;

   VP9_COMMON *const cm = &cpi->common;

   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;

     // y

     for (i = 0; i < 2; ++i) {

       const int 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

     for (i = 0; i < 2; ++i) {

       const int 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

     for (i = 0; i < 2; ++i) {

       const int 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_mb_init_quantizer(VP9_COMP *cpi, MACROBLOCK *x) {

   int i;

   VP9_COMMON *const cm = &cpi->common;

   MACROBLOCKD *xd = &x->e_mbd;

   int zbin_extra;

   int segment_id = xd->mi_8x8[0]->mbmi.segment_id;

   const int qindex = vp9_get_qindex(&cpi->common.seg, segment_id,

                                     cpi->common.base_qindex);

   int rdmult = vp9_compute_rd_mult(cpi, qindex + cm->y_dc_delta_q);

   // Y

   zbin_extra = (cpi->common.y_dequant[qindex][1] *

                  (cpi->zbin_mode_boost + x->act_zbin_adj)) >> 7;

   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)zbin_extra;

   x->e_mbd.plane[0].dequant = cpi->common.y_dequant[qindex];

   // UV

   zbin_extra = (cpi->common.uv_dequant[qindex][1] *

                 (cpi->zbin_mode_boost + x->act_zbin_adj)) >> 7;

   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)zbin_extra;

     x->e_mbd.plane[i].dequant = cpi->common.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)zbin_extra;

   x->e_mbd.plane[3].dequant = cpi->common.a_dequant[qindex];

 #endif

   x->skip_block = vp9_segfeature_active(&cpi->common.seg, segment_id,

                                         SEG_LVL_SKIP);

   /* save this macroblock QIndex for vp9_update_zbin_extra() */

   x->q_index = qindex;

   /* R/D setup */

   cpi->mb.errorperbit = rdmult >> 6;

   cpi->mb.errorperbit += (cpi->mb.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) {

   // Clear Zbin mode boost for default case

   cpi->zbin_mode_boost = 0;

   // MB level quantizer setup

   vp9_mb_init_quantizer(cpi, &cpi->mb);

 }

 void vp9_set_quantizer(struct VP9_COMP *cpi, int q) {

   VP9_COMMON *cm = &cpi->common;

   cm->base_qindex = q;

   // if any of the delta_q values are changing update flag will

   // have to be set.

   cm->y_dc_delta_q = 0;

   cm->uv_dc_delta_q = 0;

   cm->uv_ac_delta_q = 0;

   // quantizer has to be reinitialized if any delta_q changes.

   // As there are not any here for now this is inactive code.

   // if(update)

   //    vp9_init_quantizer(cpi);

 }