vpx/vp9/encoder/vp9_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 "vp9/encoder/vp9_onyx_int.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

static INLINE int plane_idx(int plane) {
  return plane == 0 ? 0 :
         plane == 1 ? 16 : 20;
}

void vp9_ht_quantize_b_4x4(MACROBLOCK *mb, int b_idx, TX_TYPE tx_type) {
  MACROBLOCKD *const xd = &mb->e_mbd;
  BLOCK *const b = &mb->block[0];
  BLOCKD *const d = &xd->block[0];
  int i, rc, eob;
  int zbin;
  int x, y, z, sz;
  int16_t *coeff_ptr       = mb->coeff + b_idx * 16;
  // ht is luma-only
  int16_t *qcoeff_ptr      = BLOCK_OFFSET(xd->plane[0].qcoeff, b_idx, 16);
  int16_t *dqcoeff_ptr     = BLOCK_OFFSET(xd->plane[0].dqcoeff, b_idx, 16);
  int16_t *zbin_boost_ptr  = b->zrun_zbin_boost;
  int16_t *zbin_ptr        = b->zbin;
  int16_t *round_ptr       = b->round;
  int16_t *quant_ptr       = b->quant;
  uint8_t *quant_shift_ptr = b->quant_shift;
  int16_t *dequant_ptr     = d->dequant;
  int zbin_oq_value        = b->zbin_extra;
  const int *pt_scan;
#if CONFIG_CODE_NONZEROCOUNT
  int nzc = 0;
#endif

  switch (tx_type) {
    case ADST_DCT:
      pt_scan = vp9_row_scan_4x4;
      break;
    case DCT_ADST:
      pt_scan = vp9_col_scan_4x4;
      break;
    default:
      pt_scan = vp9_default_zig_zag1d_4x4;
      break;
  }

  vpx_memset(qcoeff_ptr, 0, 32);
  vpx_memset(dqcoeff_ptr, 0, 32);

  eob = -1;

  if (!b->skip_block) {
    for (i = 0; i < 16; i++) {
      rc   = pt_scan[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
#if CONFIG_CODE_NONZEROCOUNT
          ++nzc;                                  // number of nonzero coeffs
#endif
          zbin_boost_ptr = b->zrun_zbin_boost;    // reset zero runlength
        }
      }
    }
  }

  xd->plane[0].eobs[b_idx] = eob + 1;
#if CONFIG_CODE_NONZEROCOUNT
  xd->nzcs[b_idx] = nzc;
#endif
}

void vp9_regular_quantize_b_4x4(MACROBLOCK *mb, int b_idx, int y_blocks) {
  MACROBLOCKD *const xd = &mb->e_mbd;
  const struct plane_block_idx pb_idx = plane_block_idx(y_blocks, b_idx);
  const int c_idx = plane_idx(pb_idx.plane);
  BLOCK *const b = &mb->block[c_idx];
  BLOCKD *const d = &xd->block[c_idx];
  int i, rc, eob;
  int zbin;
  int x, y, z, sz;
  int16_t *coeff_ptr       = mb->coeff + b_idx * 16;
  int16_t *qcoeff_ptr      = BLOCK_OFFSET(xd->plane[pb_idx.plane].qcoeff,
                                          pb_idx.block, 16);
  int16_t *dqcoeff_ptr     = BLOCK_OFFSET(xd->plane[pb_idx.plane].dqcoeff,
                                          pb_idx.block, 16);
  int16_t *zbin_boost_ptr  = b->zrun_zbin_boost;
  int16_t *zbin_ptr        = b->zbin;
  int16_t *round_ptr       = b->round;
  int16_t *quant_ptr       = b->quant;
  uint8_t *quant_shift_ptr = b->quant_shift;
  int16_t *dequant_ptr     = d->dequant;
  int zbin_oq_value        = b->zbin_extra;
#if CONFIG_CODE_NONZEROCOUNT
  int nzc = 0;
#endif

  if (c_idx == 0) assert(pb_idx.plane == 0);
  if (c_idx == 16) assert(pb_idx.plane == 1);
  if (c_idx == 20) assert(pb_idx.plane == 2);
  vpx_memset(qcoeff_ptr, 0, 32);
  vpx_memset(dqcoeff_ptr, 0, 32);

  eob = -1;

  if (!b->skip_block) {
    for (i = 0; i < 16; i++) {
      rc   = vp9_default_zig_zag1d_4x4[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
#if CONFIG_CODE_NONZEROCOUNT
          ++nzc;                                  // number of nonzero coeffs
#endif
          zbin_boost_ptr = b->zrun_zbin_boost;    // reset zero runlength
        }
      }
    }
  }

  xd->plane[pb_idx.plane].eobs[pb_idx.block] = eob + 1;
#if CONFIG_CODE_NONZEROCOUNT
  xd->nzcs[b_idx] = nzc;
#endif
}

void vp9_quantize_mby_4x4(MACROBLOCK *x) {
  int i;

  for (i = 0; i < 16; i++) {
    TX_TYPE tx_type = get_tx_type_4x4(&x->e_mbd, i);
    if (tx_type != DCT_DCT) {
      vp9_ht_quantize_b_4x4(x, i, tx_type);
    } else {
      x->quantize_b_4x4(x, i, 16);
    }
  }
}

void vp9_quantize_mbuv_4x4(MACROBLOCK *x) {
  int i;
  const MACROBLOCKD * const xd = &x->e_mbd;
  const BLOCK_SIZE_TYPE real_sb_type = xd->mode_info_context->mbmi.sb_type;
  xd->mode_info_context->mbmi.sb_type = BLOCK_SIZE_MB16X16;

  for (i = 16; i < 24; i++)
    x->quantize_b_4x4(x, i, 16);
  xd->mode_info_context->mbmi.sb_type = real_sb_type;
}

void vp9_quantize_mb_4x4(MACROBLOCK *x) {
  vp9_quantize_mby_4x4(x);
  vp9_quantize_mbuv_4x4(x);
}

void vp9_regular_quantize_b_8x8(MACROBLOCK *mb, int b_idx, TX_TYPE tx_type,
                                int y_blocks) {
  MACROBLOCKD *const xd = &mb->e_mbd;
  const struct plane_block_idx pb_idx = plane_block_idx(y_blocks, b_idx);
  const int c_idx = plane_idx(pb_idx.plane);
  int16_t *qcoeff_ptr = BLOCK_OFFSET(xd->plane[pb_idx.plane].qcoeff,
                                     pb_idx.block, 16);
  int16_t *dqcoeff_ptr = BLOCK_OFFSET(xd->plane[pb_idx.plane].dqcoeff,
                                      pb_idx.block, 16);
  BLOCK *const b = &mb->block[c_idx];
  BLOCKD *const d = &xd->block[c_idx];
  const int *pt_scan;

  switch (tx_type) {
    case ADST_DCT:
      pt_scan = vp9_row_scan_8x8;
      break;
    case DCT_ADST:
      pt_scan = vp9_col_scan_8x8;
      break;
    default:
      pt_scan = vp9_default_zig_zag1d_8x8;
      break;
  }

  if (c_idx == 0) assert(pb_idx.plane == 0);
  if (c_idx == 16) assert(pb_idx.plane == 1);
  if (c_idx == 20) assert(pb_idx.plane == 2);
  vpx_memset(qcoeff_ptr, 0, 64 * sizeof(int16_t));
  vpx_memset(dqcoeff_ptr, 0, 64 * sizeof(int16_t));

  if (!b->skip_block) {
    int i, rc, eob;
    int zbin;
    int x, y, z, sz;
    int zero_run;
    int16_t *zbin_boost_ptr = b->zrun_zbin_boost;
    int16_t *coeff_ptr  = mb->coeff + 16 * b_idx;
    int16_t *zbin_ptr   = b->zbin;
    int16_t *round_ptr  = b->round;
    int16_t *quant_ptr  = b->quant;
    uint8_t *quant_shift_ptr = b->quant_shift;
    int16_t *dequant_ptr = d->dequant;
    int zbin_oq_value = b->zbin_extra;
#if CONFIG_CODE_NONZEROCOUNT
    int nzc = 0;
#endif

    eob = -1;

    // Special case for DC as it is the one triggering access in various
    // tables: {zbin, quant, quant_shift, dequant}_ptr[rc != 0]
    {
      z    = coeff_ptr[0];
      zbin = (zbin_ptr[0] + zbin_boost_ptr[0] + zbin_oq_value);
      zero_run = 1;

      sz = (z >> 31);                                // sign of z
      x  = (z ^ sz) - sz;                            // x = abs(z)

      if (x >= zbin) {
        x += (round_ptr[0]);
        y  = ((int)(((int)(x * quant_ptr[0]) >> 16) + x))
             >> quant_shift_ptr[0];                  // quantize (x)
        x  = (y ^ sz) - sz;                          // get the sign back
        qcoeff_ptr[0]  = x;                          // write to destination
        dqcoeff_ptr[0] = x * dequant_ptr[0];         // dequantized value

        if (y) {
          eob = 0;                                   // last nonzero coeffs
#if CONFIG_CODE_NONZEROCOUNT
          ++nzc;                                  // number of nonzero coeffs
#endif
          zero_run = 0;
        }
      }
    }
    for (i = 1; i < 64; i++) {
      rc   = pt_scan[i];
      z    = coeff_ptr[rc];
      zbin = (zbin_ptr[1] + zbin_boost_ptr[zero_run] + zbin_oq_value);
      // The original code was incrementing zero_run while keeping it at
      // maximum 15 by adding "(zero_run < 15)". The same is achieved by
      // removing the opposite of the sign mask of "(zero_run - 15)".
      zero_run -= (zero_run - 15) >> 31;

      sz = (z >> 31);                                // sign of z
      x  = (z ^ sz) - sz;                            // x = abs(z)

      if (x >= zbin) {
        x += (round_ptr[rc != 0]);
        y  = ((int)(((int)(x * quant_ptr[1]) >> 16) + x))
             >> quant_shift_ptr[1];                  // quantize (x)
        x  = (y ^ sz) - sz;                          // get the sign back
        qcoeff_ptr[rc]  = x;                         // write to destination
        dqcoeff_ptr[rc] = x * dequant_ptr[1];        // dequantized value

        if (y) {
          eob = i;                                   // last nonzero coeffs
#if CONFIG_CODE_NONZEROCOUNT
          ++nzc;                                     // number of nonzero coeffs
#endif
          zero_run = 0;
        }
      }
    }
    xd->plane[pb_idx.plane].eobs[pb_idx.block] = eob + 1;
#if CONFIG_CODE_NONZEROCOUNT
    xd->nzcs[b_idx] = nzc;
#endif
  } else {
    xd->plane[pb_idx.plane].eobs[pb_idx.block] = 0;
#if CONFIG_CODE_NONZEROCOUNT
    xd->nzcs[b_idx] = 0;
#endif
  }
}

void vp9_quantize_mby_8x8(MACROBLOCK *x) {
  int i;

#if CONFIG_CODE_NONZEROCOUNT
  for (i = 0; i < 16; i ++) {
    x->e_mbd.nzcs[i] = 0;
  }
#endif
  for (i = 0; i < 16; i += 4) {
    TX_TYPE tx_type = get_tx_type_8x8(&x->e_mbd, (i & 8) + ((i & 4) >> 1));
    x->quantize_b_8x8(x, i, tx_type, 16);
  }
}

void vp9_quantize_mbuv_8x8(MACROBLOCK *x) {
  int i;
  const MACROBLOCKD * const xd = &x->e_mbd;
  const BLOCK_SIZE_TYPE real_sb_type = xd->mode_info_context->mbmi.sb_type;
  xd->mode_info_context->mbmi.sb_type = BLOCK_SIZE_MB16X16;

#if CONFIG_CODE_NONZEROCOUNT
  for (i = 16; i < 24; i ++) {
    x->e_mbd.nzcs[i] = 0;
  }
#endif
  for (i = 16; i < 24; i += 4)
    x->quantize_b_8x8(x, i, DCT_DCT, 16);
  xd->mode_info_context->mbmi.sb_type = real_sb_type;
}

void vp9_quantize_mb_8x8(MACROBLOCK *x) {
  vp9_quantize_mby_8x8(x);
  vp9_quantize_mbuv_8x8(x);
}

void vp9_quantize_mby_16x16(MACROBLOCK *x) {
  TX_TYPE tx_type = get_tx_type_16x16(&x->e_mbd, 0);
#if CONFIG_CODE_NONZEROCOUNT
  int i;
  for (i = 0; i < 16; i++) {
    x->e_mbd.nzcs[i] = 0;
  }
#endif
  x->quantize_b_16x16(x, 0, tx_type, 16);
}

void vp9_quantize_mb_16x16(MACROBLOCK *x) {
  vp9_quantize_mby_16x16(x);
  vp9_quantize_mbuv_8x8(x);
}

static void quantize(int16_t *zbin_boost_orig_ptr,
                     int16_t *coeff_ptr, int n_coeffs, int skip_block,
                     int16_t *zbin_ptr, int16_t *round_ptr, int16_t *quant_ptr,
                     uint8_t *quant_shift_ptr,
                     int16_t *qcoeff_ptr, int16_t *dqcoeff_ptr,
                     int16_t *dequant_ptr, int zbin_oq_value,
                     uint16_t *eob_ptr,
#if CONFIG_CODE_NONZEROCOUNT
                     uint16_t *nzc_ptr,
#endif
                     const int *scan, int mul) {
  int i, rc, eob;
  int zbin;
  int x, y, z, sz;
  int zero_run = 0;
  int16_t *zbin_boost_ptr = zbin_boost_orig_ptr;
#if CONFIG_CODE_NONZEROCOUNT
  int nzc = 0;
#endif

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

  eob = -1;

  if (!skip_block) {
    for (i = 0; i < n_coeffs; i++) {
      rc   = scan[i];
      z    = coeff_ptr[rc] * mul;

      zbin = (zbin_ptr[rc != 0] + zbin_boost_ptr[zero_run] + zbin_oq_value);
      zero_run += (zero_run < 15);

      sz = (z >> 31);                               // sign of z
      x  = (z ^ sz) - sz;                           // x = abs(z)

      if (x >= zbin) {
        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] / mul;  // dequantized value

        if (y) {
          eob = i;                                  // last nonzero coeffs
          zero_run = 0;
#if CONFIG_CODE_NONZEROCOUNT
          ++nzc;                                    // number of nonzero coeffs
#endif
        }
      }
    }
  }

  *eob_ptr = eob + 1;
#if CONFIG_CODE_NONZEROCOUNT
  *nzc_ptr = nzc;
#endif
}

void vp9_regular_quantize_b_16x16(MACROBLOCK *mb, int b_idx, TX_TYPE tx_type,
                                  int y_blocks) {
  MACROBLOCKD *const xd = &mb->e_mbd;
  const struct plane_block_idx pb_idx = plane_block_idx(y_blocks, b_idx);
  const int c_idx = plane_idx(pb_idx.plane);
  BLOCK *const b = &mb->block[c_idx];
  BLOCKD *const d = &xd->block[c_idx];
  const int *pt_scan;

  switch (tx_type) {
    case ADST_DCT:
      pt_scan = vp9_row_scan_16x16;
      break;
    case DCT_ADST:
      pt_scan = vp9_col_scan_16x16;
      break;
    default:
      pt_scan = vp9_default_zig_zag1d_16x16;
      break;
  }

  if (c_idx == 0) assert(pb_idx.plane == 0);
  if (c_idx == 16) assert(pb_idx.plane == 1);
  if (c_idx == 20) assert(pb_idx.plane == 2);
  quantize(b->zrun_zbin_boost,
           mb->coeff + 16 * b_idx,
           256, b->skip_block,
           b->zbin, b->round, b->quant, b->quant_shift,
           BLOCK_OFFSET(xd->plane[pb_idx.plane].qcoeff, pb_idx.block, 16),
           BLOCK_OFFSET(xd->plane[pb_idx.plane].dqcoeff, pb_idx.block, 16),
           d->dequant,
           b->zbin_extra,
           &xd->plane[pb_idx.plane].eobs[pb_idx.block],
#if CONFIG_CODE_NONZEROCOUNT
           &xd->nzcs[b_idx],
#endif
           pt_scan, 1);
}

void vp9_regular_quantize_b_32x32(MACROBLOCK *mb, int b_idx, int y_blocks) {
  MACROBLOCKD *const xd = &mb->e_mbd;
  const struct plane_block_idx pb_idx = plane_block_idx(y_blocks, b_idx);
  const int c_idx = plane_idx(pb_idx.plane);
  BLOCK *const b = &mb->block[c_idx];
  BLOCKD *const d = &xd->block[c_idx];

  if (c_idx == 0) assert(pb_idx.plane == 0);
  if (c_idx == 16) assert(pb_idx.plane == 1);
  if (c_idx == 20) assert(pb_idx.plane == 2);
  quantize(b->zrun_zbin_boost,
           mb->coeff + b_idx * 16,
           1024, b->skip_block,
           b->zbin,
           b->round, b->quant, b->quant_shift,
           BLOCK_OFFSET(xd->plane[pb_idx.plane].qcoeff, pb_idx.block, 16),
           BLOCK_OFFSET(xd->plane[pb_idx.plane].dqcoeff, pb_idx.block, 16),
           d->dequant,
           b->zbin_extra,
           &xd->plane[pb_idx.plane].eobs[pb_idx.block],
#if CONFIG_CODE_NONZEROCOUNT
           &xd->nzcs[b_idx],
#endif
           vp9_default_zig_zag1d_32x32, 2);
}

void vp9_quantize_sby_32x32(MACROBLOCK *x, BLOCK_SIZE_TYPE bsize) {
  const int bw = 1 << (mb_width_log2(bsize) - 1);
  const int bh = 1 << (mb_height_log2(bsize) - 1);
  int n;

  for (n = 0; n < bw * bh; n++)
    vp9_regular_quantize_b_32x32(x, n * 64, bw * bh * 64);
}

void vp9_quantize_sby_16x16(MACROBLOCK *x, BLOCK_SIZE_TYPE bsize) {
  const int bwl = mb_width_log2(bsize), bw = 1 << bwl;
  const int bh = 1 << mb_height_log2(bsize);
  const int bstride = 16 << bwl;
  int n;

  for (n = 0; n < bw * bh; n++) {
    const int x_idx = n & (bw - 1), y_idx = n >> bwl;
    TX_TYPE tx_type = get_tx_type_16x16(&x->e_mbd,
                                        4 * x_idx + y_idx * bstride);
    x->quantize_b_16x16(x, n * 16, tx_type, 16 * bw * bh);
  }
}

void vp9_quantize_sby_8x8(MACROBLOCK *x, BLOCK_SIZE_TYPE bsize) {
  const int bwl = mb_width_log2(bsize) + 1, bw = 1 << bwl;
  const int bh = 1 << (mb_height_log2(bsize) + 1);
  const int bstride = 4 << bwl;
  int n;

  for (n = 0; n < bw * bh; n++) {
    const int x_idx = n & (bw - 1), y_idx = n >> bwl;
    TX_TYPE tx_type = get_tx_type_8x8(&x->e_mbd,
                                      2 * x_idx + y_idx * bstride);
    x->quantize_b_8x8(x, n * 4, tx_type, 4 * bw * bh);
  }
}

void vp9_quantize_sby_4x4(MACROBLOCK *x, BLOCK_SIZE_TYPE bsize) {
  const int bwl = mb_width_log2(bsize) + 2, bw = 1 << bwl;
  const int bh = 1 << (mb_height_log2(bsize) + 2);
  MACROBLOCKD *const xd = &x->e_mbd;
  int n;

  for (n = 0; n < bw * bh; n++) {
    const TX_TYPE tx_type = get_tx_type_4x4(xd, n);
    if (tx_type != DCT_DCT) {
      vp9_ht_quantize_b_4x4(x, n, tx_type);
    } else {
      x->quantize_b_4x4(x, n, bw * bh);
    }
  }
}

void vp9_quantize_sbuv_32x32(MACROBLOCK *x, BLOCK_SIZE_TYPE bsize) {
  assert(bsize == BLOCK_SIZE_SB64X64);
  vp9_regular_quantize_b_32x32(x, 256, 256);
  vp9_regular_quantize_b_32x32(x, 320, 256);
}

void vp9_quantize_sbuv_16x16(MACROBLOCK *x, BLOCK_SIZE_TYPE bsize) {
  const int bwl = mb_width_log2(bsize);
  const int bhl = mb_width_log2(bsize);
  const int uoff = 16 << (bhl + bwl);
  int i;

  for (i = uoff; i < ((uoff * 3) >> 1); i += 16)
    x->quantize_b_16x16(x, i, DCT_DCT, uoff);
}

void vp9_quantize_sbuv_8x8(MACROBLOCK *x, BLOCK_SIZE_TYPE bsize) {
  const int bwl = mb_width_log2(bsize);
  const int bhl = mb_width_log2(bsize);
  const int uoff = 16 << (bhl + bwl);
  int i;

  for (i = uoff; i < ((uoff * 3) >> 1); i += 4)
    x->quantize_b_8x8(x, i, DCT_DCT, uoff);
}

void vp9_quantize_sbuv_4x4(MACROBLOCK *x, BLOCK_SIZE_TYPE bsize) {
  const int bwl = mb_width_log2(bsize);
  const int bhl = mb_width_log2(bsize);
  const int uoff = 16 << (bhl + bwl);
  int i;

  for (i = uoff; i < ((uoff * 3) >> 1); i++)
    x->quantize_b_4x4(x, i, uoff);
}

/* 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 vp9_regular_quantize_b_4x4_pair(MACROBLOCK *x, int b_idx1, int b_idx2,
                                     int y_blocks) {
  vp9_regular_quantize_b_4x4(x, b_idx1, y_blocks);
  vp9_regular_quantize_b_4x4(x, b_idx2, y_blocks);
}

static void invert_quant(int16_t *quant, uint8_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 = l;
}

void vp9_init_quantizer(VP9_COMP *cpi) {
  int i;
  int quant_val;
  int q;

  static const int zbin_boost[16] = { 0,  0,  0,  8,  8,  8, 10, 12,
                                     14, 16, 20, 24, 28, 32, 36, 40 };

  for (q = 0; q < QINDEX_RANGE; q++) {
    int qzbin_factor = (vp9_dc_quant(q, 0) < 148) ? 84 : 80;
    int qrounding_factor = 48;
    if (q == 0) {
      qzbin_factor = 64;
      qrounding_factor = 64;
    }
    // dc values
    quant_val = vp9_dc_quant(q, cpi->common.y1dc_delta_q);
    invert_quant(cpi->Y1quant[q] + 0, cpi->Y1quant_shift[q] + 0, quant_val);
    cpi->Y1zbin[q][0] = ROUND_POWER_OF_TWO(qzbin_factor * quant_val, 7);
    cpi->Y1round[q][0] = (qrounding_factor * quant_val) >> 7;
    cpi->common.y_dequant[q][0] = quant_val;
    cpi->zrun_zbin_boost_y1[q][0] = (quant_val * zbin_boost[0]) >> 7;

    quant_val = vp9_dc_uv_quant(q, cpi->common.uvdc_delta_q);
    invert_quant(cpi->UVquant[q] + 0, cpi->UVquant_shift[q] + 0, quant_val);
    cpi->UVzbin[q][0] = ROUND_POWER_OF_TWO(qzbin_factor * quant_val, 7);
    cpi->UVround[q][0] = (qrounding_factor * quant_val) >> 7;
    cpi->common.uv_dequant[q][0] = quant_val;
    cpi->zrun_zbin_boost_uv[q][0] = (quant_val * zbin_boost[0]) >> 7;

    // all the 4x4 ac values =;
    for (i = 1; i < 16; i++) {
      int rc = vp9_default_zig_zag1d_4x4[i];

      quant_val = vp9_ac_yquant(q);
      invert_quant(cpi->Y1quant[q] + rc, cpi->Y1quant_shift[q] + rc, quant_val);
      cpi->Y1zbin[q][rc] = ROUND_POWER_OF_TWO(qzbin_factor * quant_val, 7);
      cpi->Y1round[q][rc] = (qrounding_factor * quant_val) >> 7;
      cpi->common.y_dequant[q][rc] = quant_val;
      cpi->zrun_zbin_boost_y1[q][i] =
          ROUND_POWER_OF_TWO(quant_val * zbin_boost[i], 7);

      quant_val = vp9_ac_uv_quant(q, cpi->common.uvac_delta_q);
      invert_quant(cpi->UVquant[q] + rc, cpi->UVquant_shift[q] + rc, quant_val);
      cpi->UVzbin[q][rc] = ROUND_POWER_OF_TWO(qzbin_factor * quant_val, 7);
      cpi->UVround[q][rc] = (qrounding_factor * quant_val) >> 7;
      cpi->common.uv_dequant[q][rc] = quant_val;
      cpi->zrun_zbin_boost_uv[q][i] =
          ROUND_POWER_OF_TWO(quant_val * zbin_boost[i], 7);
    }
  }
}

void vp9_mb_init_quantizer(VP9_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 (vp9_segfeature_active(xd, segment_id, SEG_LVL_ALT_Q)) {
    if (xd->mb_segment_abs_delta == SEGMENT_ABSDATA) {
      // Abs Value
      qindex = vp9_get_segdata(xd, segment_id, SEG_LVL_ALT_Q);
    } else {
      // Delta Value
      qindex = cpi->common.base_qindex +
                 vp9_get_segdata(xd, segment_id, SEG_LVL_ALT_Q);

      // Clamp to valid range
      qindex = clamp(qindex, 0, MAXQ);
    }
  } else {
    qindex = cpi->common.base_qindex;
  }

  // Y
  zbin_extra = (cpi->common.y_dequant[qindex][1] *
                 (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_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.y_dequant[qindex];
    x->block[i].zrun_zbin_boost = cpi->zrun_zbin_boost_y1[qindex];
    x->block[i].zbin_extra = (int16_t)zbin_extra;

    // Segment skip feature.
    x->block[i].skip_block =
      vp9_segfeature_active(xd, segment_id, SEG_LVL_SKIP);
  }

  // UV
  zbin_extra = (cpi->common.uv_dequant[qindex][1] *
                (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_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.uv_dequant[qindex];
    x->block[i].zrun_zbin_boost = cpi->zrun_zbin_boost_uv[qindex];
    x->block[i].zbin_extra = (int16_t)zbin_extra;

    // Segment skip feature.
    x->block[i].skip_block =
        vp9_segfeature_active(xd, segment_id, SEG_LVL_SKIP);
  }

  /* save this macroblock QIndex for vp9_update_zbin_extra() */
  x->e_mbd.q_index = qindex;
}

void vp9_update_zbin_extra(VP9_COMP *cpi, MACROBLOCK *x) {
  int i;
  const int qindex = x->e_mbd.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;

  for (i = 0; i < 16; i++)
    x->block[i].zbin_extra = (int16_t)y_zbin_extra;

  for (i = 16; i < 24; i++)
    x->block[i].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;

  // Set lossless mode
  if (cm->base_qindex <= 4)
    cm->base_qindex = 0;

  // if any of the delta_q values are changing update flag will
  // have to be set.
  cm->y1dc_delta_q = 0;
  cm->uvdc_delta_q = 0;
  cm->uvac_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);
}