/*

 * Copyright (c) 2016, Alliance for Open Media. All rights reserved.

 *

 * This source code is subject to the terms of the BSD 2 Clause License and

 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License

 * was not distributed with this source code in the LICENSE file, you can

 * obtain it at www.aomedia.org/license/software. If the Alliance for Open

 * Media Patent License 1.0 was not distributed with this source code in the

 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.

 */

#include "config/aom_config.h"

#include "config/av1_rtcd.h"

#include "config/aom_dsp_rtcd.h"

#include "aom_dsp/bitwriter.h"

#include "aom_dsp/quantize.h"

#include "aom_mem/aom_mem.h"

#include "aom_ports/mem.h"

#if CONFIG_BITSTREAM_DEBUG || CONFIG_MISMATCH_DEBUG

#include "aom_util/debug_util.h"

#endif  // CONFIG_BITSTREAM_DEBUG || CONFIG_MISMATCH_DEBUG

#include "av1/common/cfl.h"

#include "av1/common/idct.h"

#include "av1/common/reconinter.h"

#include "av1/common/reconintra.h"

#include "av1/common/scan.h"

#include "av1/encoder/av1_quantize.h"

#include "av1/encoder/encodemb.h"

#include "av1/encoder/hybrid_fwd_txfm.h"

#include "av1/encoder/txb_rdopt.h"

#include "av1/encoder/rd.h"

#include "av1/encoder/rdopt.h"

void av1_subtract_block(BitDepthInfo bd_info, int rows, int cols, int16_t *diff,

                        ptrdiff_t diff_stride, const uint8_t *src8,

                        ptrdiff_t src_stride, const uint8_t *pred8,

                        ptrdiff_t pred_stride) {

  assert(rows >= 4 && cols >= 4);

#if CONFIG_AV1_HIGHBITDEPTH

  if (bd_info.use_highbitdepth_buf) {

    aom_highbd_subtract_block(rows, cols, diff, diff_stride, src8, src_stride,

                              pred8, pred_stride);

    return;

  }

#endif

  (void)bd_info;

  aom_subtract_block(rows, cols, diff, diff_stride, src8, src_stride, pred8,

                     pred_stride);

}

void av1_subtract_txb(MACROBLOCK *x, int plane, BLOCK_SIZE plane_bsize,

                      int blk_col, int blk_row, TX_SIZE tx_size) {

  MACROBLOCKD *const xd = &x->e_mbd;

  const BitDepthInfo bd_info = get_bit_depth_info(xd);

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

  const struct macroblockd_plane *const pd = &x->e_mbd.plane[plane];

  const int diff_stride = block_size_wide[plane_bsize];

  const int src_stride = p->src.stride;

  const int dst_stride = pd->dst.stride;

  const int tx1d_width = tx_size_wide[tx_size];

  const int tx1d_height = tx_size_high[tx_size];

  uint8_t *dst = &pd->dst.buf[(blk_row * dst_stride + blk_col) << MI_SIZE_LOG2];

  uint8_t *src = &p->src.buf[(blk_row * src_stride + blk_col) << MI_SIZE_LOG2];

  int16_t *src_diff =

      &p->src_diff[(blk_row * diff_stride + blk_col) << MI_SIZE_LOG2];

  av1_subtract_block(bd_info, tx1d_height, tx1d_width, src_diff, diff_stride,

                     src, src_stride, dst, dst_stride);

}

void av1_subtract_plane(MACROBLOCK *x, BLOCK_SIZE plane_bsize, int plane) {

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

  const struct macroblockd_plane *const pd = &x->e_mbd.plane[plane];

  assert(plane_bsize < BLOCK_SIZES_ALL);

  const int bw = block_size_wide[plane_bsize];

  const int bh = block_size_high[plane_bsize];

  const MACROBLOCKD *xd = &x->e_mbd;

  const BitDepthInfo bd_info = get_bit_depth_info(xd);

  av1_subtract_block(bd_info, bh, bw, p->src_diff, bw, p->src.buf,

                     p->src.stride, pd->dst.buf, pd->dst.stride);

}

int av1_optimize_b(const struct AV1_COMP *cpi, MACROBLOCK *x, int plane,

                   int block, TX_SIZE tx_size, TX_TYPE tx_type,

                   const TXB_CTX *const txb_ctx, int *rate_cost) {

  MACROBLOCKD *const xd = &x->e_mbd;

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

  const int eob = p->eobs[block];

  const int segment_id = xd->mi[0]->segment_id;

  if (eob == 0 || !cpi->optimize_seg_arr[segment_id] ||

      xd->lossless[segment_id]) {

    *rate_cost = av1_cost_skip_txb(&x->coeff_costs, txb_ctx, plane, tx_size);

    return eob;

  }

  return av1_optimize_txb(cpi, x, plane, block, tx_size, tx_type, txb_ctx,

                          rate_cost, cpi->oxcf.algo_cfg.sharpness);

}

// Hyper-parameters for dropout optimization, based on following logics.

// TODO(yjshen): These settings are tuned by experiments. They may still be

// optimized for better performance.

// (1) Coefficients which are large enough will ALWAYS be kept.

static const tran_low_t DROPOUT_COEFF_MAX = 2;  // Max dropout-able coefficient.

// (2) Continuous coefficients will ALWAYS be kept. Here rigorous continuity is

//     NOT required. For example, `5 0 0 0 7` is treated as two continuous

//     coefficients if three zeros do not fulfill the dropout condition.

static const int DROPOUT_CONTINUITY_MAX =

    2;  // Max dropout-able continuous coeff.

// (3) Dropout operation is NOT applicable to blocks with large or small

//     quantization index.

static const int DROPOUT_Q_MAX = 128;

static const int DROPOUT_Q_MIN = 16;

// (4) Recall that dropout optimization will forcibly set some quantized

//     coefficients to zero. The key logic on determining whether a coefficient

//     should be dropped is to check the number of continuous zeros before AND

//     after this coefficient. The exact number of zeros for judgement depends

//     on block size and quantization index. More concretely, block size

//     determines the base number of zeros, while quantization index determines

//     the multiplier. Intuitively, larger block requires more zeros and larger

//     quantization index also requires more zeros (more information is lost

//     when using larger quantization index).

static const int DROPOUT_BEFORE_BASE_MAX =

    32;  // Max base number for leading zeros.

static const int DROPOUT_BEFORE_BASE_MIN =

    16;  // Min base number for leading zeros.

static const int DROPOUT_AFTER_BASE_MAX =

    32;  // Max base number for trailing zeros.

static const int DROPOUT_AFTER_BASE_MIN =

    16;  // Min base number for trailing zeros.

static const int DROPOUT_MULTIPLIER_MAX =

    8;  // Max multiplier on number of zeros.

static const int DROPOUT_MULTIPLIER_MIN =

    2;  // Min multiplier on number of zeros.

static const int DROPOUT_MULTIPLIER_Q_BASE =

    32;  // Base Q to compute multiplier.

void av1_dropout_qcoeff(MACROBLOCK *mb, int plane, int block, TX_SIZE tx_size,

                        TX_TYPE tx_type, int qindex) {

  const int tx_width = tx_size_wide[tx_size];

  const int tx_height = tx_size_high[tx_size];

  // Early return if `qindex` is out of range.

  if (qindex > DROPOUT_Q_MAX || qindex < DROPOUT_Q_MIN) {

    return;

  }

  // Compute number of zeros used for dropout judgement.

  const int base_size = AOMMAX(tx_width, tx_height);

  const int multiplier = CLIP(qindex / DROPOUT_MULTIPLIER_Q_BASE,

                              DROPOUT_MULTIPLIER_MIN, DROPOUT_MULTIPLIER_MAX);

  const int dropout_num_before =

      multiplier *

      CLIP(base_size, DROPOUT_BEFORE_BASE_MIN, DROPOUT_BEFORE_BASE_MAX);

  const int dropout_num_after =

      multiplier *

      CLIP(base_size, DROPOUT_AFTER_BASE_MIN, DROPOUT_AFTER_BASE_MAX);

  av1_dropout_qcoeff_num(mb, plane, block, tx_size, tx_type, dropout_num_before,

                         dropout_num_after);

}

void av1_dropout_qcoeff_num(MACROBLOCK *mb, int plane, int block,

                            TX_SIZE tx_size, TX_TYPE tx_type,

                            int dropout_num_before, int dropout_num_after) {

  const struct macroblock_plane *const p = &mb->plane[plane];

  tran_low_t *const qcoeff = p->qcoeff + BLOCK_OFFSET(block);

  tran_low_t *const dqcoeff = p->dqcoeff + BLOCK_OFFSET(block);

  const int max_eob = av1_get_max_eob(tx_size);

  const SCAN_ORDER *const scan_order = get_scan(tx_size, tx_type);

  // Early return if there are not enough non-zero coefficients.

  if (p->eobs[block] == 0 || p->eobs[block] <= dropout_num_before ||

      max_eob <= dropout_num_before + dropout_num_after) {

    return;

  }

  int count_zeros_before = 0;

  int count_zeros_after = 0;

  int count_nonzeros = 0;

  // Index of the first non-zero coefficient after sufficient number of

  // continuous zeros. If equals to `-1`, it means number of leading zeros

  // hasn't reach `dropout_num_before`.

  int idx = -1;

  int eob = 0;  // New end of block.

  for (int i = 0; i < p->eobs[block]; ++i) {

    const int scan_idx = scan_order->scan[i];

    if (abs(qcoeff[scan_idx]) > DROPOUT_COEFF_MAX) {

      // Keep large coefficients.

      count_zeros_before = 0;

      count_zeros_after = 0;

      idx = -1;

      eob = i + 1;

    } else if (qcoeff[scan_idx] == 0) {  // Count zeros.

      if (idx == -1) {

        ++count_zeros_before;

      } else {

        ++count_zeros_after;

      }

    } else {  // Count non-zeros.

      if (count_zeros_before >= dropout_num_before) {

        idx = (idx == -1) ? i : idx;

        ++count_nonzeros;

      } else {

        count_zeros_before = 0;

        eob = i + 1;

      }

    }

    // Handle continuity.

    if (count_nonzeros > DROPOUT_CONTINUITY_MAX) {

      count_zeros_before = 0;

      count_zeros_after = 0;

      count_nonzeros = 0;

      idx = -1;

      eob = i + 1;

    }

    // Handle the trailing zeros after original end of block.

    if (idx != -1 && i == p->eobs[block] - 1) {

      count_zeros_after += (max_eob - p->eobs[block]);

    }

    // Set redundant coefficients to zeros if needed.

    if (count_zeros_after >= dropout_num_after) {

      for (int j = idx; j <= i; ++j) {

        qcoeff[scan_order->scan[j]] = 0;

        dqcoeff[scan_order->scan[j]] = 0;

      }

      count_zeros_before += (i - idx + 1);

      count_zeros_after = 0;

      count_nonzeros = 0;

    } else if (i == p->eobs[block] - 1) {

      eob = i + 1;

    }

  }

  if (eob != p->eobs[block]) {

    p->eobs[block] = eob;

    p->txb_entropy_ctx[block] =

        av1_get_txb_entropy_context(qcoeff, scan_order, eob);

  }

}

enum {

  QUANT_FUNC_LOWBD = 0,

  QUANT_FUNC_HIGHBD = 1,

  QUANT_FUNC_TYPES = 2

} UENUM1BYTE(QUANT_FUNC);

#if CONFIG_AV1_HIGHBITDEPTH

static AV1_QUANT_FACADE

    quant_func_list[AV1_XFORM_QUANT_TYPES][QUANT_FUNC_TYPES] = {

      { av1_quantize_fp_facade, av1_highbd_quantize_fp_facade },

      { av1_quantize_b_facade, av1_highbd_quantize_b_facade },

      { av1_quantize_dc_facade, av1_highbd_quantize_dc_facade },

      { NULL, NULL }

    };

#else

static AV1_QUANT_FACADE quant_func_list[AV1_XFORM_QUANT_TYPES] = {

  av1_quantize_fp_facade, av1_quantize_b_facade, av1_quantize_dc_facade, NULL

};

#endif

// Computes the transform for DC only blocks

void av1_xform_dc_only(MACROBLOCK *x, int plane, int block,

                       TxfmParam *txfm_param, int64_t per_px_mean) {

  assert(per_px_mean != INT64_MAX);

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

  const int block_offset = BLOCK_OFFSET(block);

  tran_low_t *const coeff = p->coeff + block_offset;

  const int n_coeffs = av1_get_max_eob(txfm_param->tx_size);

  memset(coeff, 0, sizeof(*coeff) * n_coeffs);

  coeff[0] =

      (tran_low_t)((per_px_mean * dc_coeff_scale[txfm_param->tx_size]) >> 12);

}

void av1_xform_quant(MACROBLOCK *x, int plane, int block, int blk_row,

                     int blk_col, BLOCK_SIZE plane_bsize, TxfmParam *txfm_param,

                     const QUANT_PARAM *qparam) {

  av1_xform(x, plane, block, blk_row, blk_col, plane_bsize, txfm_param);

  av1_quant(x, plane, block, txfm_param, qparam);

}

void av1_xform(MACROBLOCK *x, int plane, int block, int blk_row, int blk_col,

               BLOCK_SIZE plane_bsize, TxfmParam *txfm_param) {

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

  const int block_offset = BLOCK_OFFSET(block);

  tran_low_t *const coeff = p->coeff + block_offset;

  const int diff_stride = block_size_wide[plane_bsize];

  const int src_offset = (blk_row * diff_stride + blk_col);

  const int16_t *src_diff = &p->src_diff[src_offset << MI_SIZE_LOG2];

  av1_fwd_txfm(src_diff, coeff, diff_stride, txfm_param);

}

void av1_quant(MACROBLOCK *x, int plane, int block, TxfmParam *txfm_param,

               const QUANT_PARAM *qparam) {

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

  const SCAN_ORDER *const scan_order =

      get_scan(txfm_param->tx_size, txfm_param->tx_type);

  const int block_offset = BLOCK_OFFSET(block);

  tran_low_t *const coeff = p->coeff + block_offset;

  tran_low_t *const qcoeff = p->qcoeff + block_offset;

  tran_low_t *const dqcoeff = p->dqcoeff + block_offset;

  uint16_t *const eob = &p->eobs[block];

  if (qparam->xform_quant_idx != AV1_XFORM_QUANT_SKIP_QUANT) {

    const int n_coeffs = av1_get_max_eob(txfm_param->tx_size);

    if (LIKELY(!x->seg_skip_block)) {

#if CONFIG_AV1_HIGHBITDEPTH

      quant_func_list[qparam->xform_quant_idx][txfm_param->is_hbd](

          coeff, n_coeffs, p, qcoeff, dqcoeff, eob, scan_order, qparam);

#else

      quant_func_list[qparam->xform_quant_idx](

          coeff, n_coeffs, p, qcoeff, dqcoeff, eob, scan_order, qparam);

#endif

    } else {

      av1_quantize_skip(n_coeffs, qcoeff, dqcoeff, eob);

    }

  }

  // use_optimize_b is true means av1_optimze_b will be called,

  // thus cannot update entropy ctx now (performed in optimize_b)

  if (qparam->use_optimize_b) {

    p->txb_entropy_ctx[block] = 0;

  } else {

    p->txb_entropy_ctx[block] =

        av1_get_txb_entropy_context(qcoeff, scan_order, *eob);

  }

}

void av1_setup_xform(const AV1_COMMON *cm, MACROBLOCK *x, TX_SIZE tx_size,

                     TX_TYPE tx_type, TxfmParam *txfm_param) {

  MACROBLOCKD *const xd = &x->e_mbd;

  MB_MODE_INFO *const mbmi = xd->mi[0];

  txfm_param->tx_type = tx_type;

  txfm_param->tx_size = tx_size;

  txfm_param->lossless = xd->lossless[mbmi->segment_id];

  txfm_param->tx_set_type = av1_get_ext_tx_set_type(

      tx_size, is_inter_block(mbmi), cm->features.reduced_tx_set_used);

  txfm_param->bd = xd->bd;

  txfm_param->is_hbd = is_cur_buf_hbd(xd);

}

void av1_setup_quant(TX_SIZE tx_size, int use_optimize_b, int xform_quant_idx,

                     int use_quant_b_adapt, QUANT_PARAM *qparam) {

  qparam->log_scale = av1_get_tx_scale(tx_size);

  qparam->tx_size = tx_size;

  qparam->use_quant_b_adapt = use_quant_b_adapt;

  // TODO(bohanli): optimize_b and quantization idx has relationship,

  // but is kind of buried and complicated in different encoding stages.

  // Should have a unified function to derive quant_idx, rather than

  // determine and pass in the quant_idx

  qparam->use_optimize_b = use_optimize_b;

  qparam->xform_quant_idx = xform_quant_idx;

  qparam->qmatrix = NULL;

  qparam->iqmatrix = NULL;

}

void av1_setup_qmatrix(const CommonQuantParams *quant_params,

                       const MACROBLOCKD *xd, int plane, TX_SIZE tx_size,

                       TX_TYPE tx_type, QUANT_PARAM *qparam) {

  qparam->qmatrix = av1_get_qmatrix(quant_params, xd, plane, tx_size, tx_type);

  qparam->iqmatrix =

      av1_get_iqmatrix(quant_params, xd, plane, tx_size, tx_type);

}

static void encode_block(int plane, int block, int blk_row, int blk_col,

                         BLOCK_SIZE plane_bsize, TX_SIZE tx_size, void *arg,

                         RUN_TYPE dry_run) {

  (void)dry_run;

  struct encode_b_args *const args = arg;

  const AV1_COMP *const cpi = args->cpi;

  const AV1_COMMON *const cm = &cpi->common;

  MACROBLOCK *const x = args->x;

  MACROBLOCKD *const xd = &x->e_mbd;

  MB_MODE_INFO *mbmi = xd->mi[0];

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

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

  tran_low_t *const dqcoeff = p->dqcoeff + BLOCK_OFFSET(block);

  uint8_t *dst;

  ENTROPY_CONTEXT *a, *l;

  int dummy_rate_cost = 0;

  dst = &pd->dst.buf[(blk_row * pd->dst.stride + blk_col) << MI_SIZE_LOG2];

  a = &args->ta[blk_col];

  l = &args->tl[blk_row];

  TX_TYPE tx_type = DCT_DCT;

  if (!mbmi->skip_mode) {

    tx_type = av1_get_tx_type(xd, pd->plane_type, blk_row, blk_col, tx_size,

                              cm->features.reduced_tx_set_used);

    TxfmParam txfm_param;

    QUANT_PARAM quant_param;

    const int use_trellis = is_trellis_used(args->enable_optimize_b, dry_run);

    int quant_idx;

    if (use_trellis)

      quant_idx = AV1_XFORM_QUANT_FP;

    else

      quant_idx =

          USE_B_QUANT_NO_TRELLIS ? AV1_XFORM_QUANT_B : AV1_XFORM_QUANT_FP;

    av1_setup_xform(cm, x, tx_size, tx_type, &txfm_param);

    av1_setup_quant(tx_size, use_trellis, quant_idx,

                    cpi->oxcf.q_cfg.quant_b_adapt, &quant_param);

    av1_setup_qmatrix(&cm->quant_params, xd, plane, tx_size, tx_type,

                      &quant_param);

    av1_xform_quant(x, plane, block, blk_row, blk_col, plane_bsize, &txfm_param,

                    &quant_param);

    if (use_trellis) {

      TXB_CTX txb_ctx;

      get_txb_ctx(plane_bsize, tx_size, plane, a, l, &txb_ctx);

      av1_optimize_b(args->cpi, x, plane, block, tx_size, tx_type, &txb_ctx,

                     &dummy_rate_cost);

    }

  } else {

    p->eobs[block] = 0;

    p->txb_entropy_ctx[block] = 0;

  }

  av1_set_txb_context(x, plane, block, tx_size, a, l);

  if (p->eobs[block]) {

    // As long as any YUV plane has non-zero quantized transform coefficients,

    // mbmi->skip_txfm flag is set to 0.

    mbmi->skip_txfm = 0;

    av1_inverse_transform_block(xd, dqcoeff, plane, tx_type, tx_size, dst,

                                pd->dst.stride, p->eobs[block],

                                cm->features.reduced_tx_set_used);

  } else {

    // Only when YUV planes all have zero quantized transform coefficients,

    // mbmi->skip_txfm flag is set to 1.

    mbmi->skip_txfm &= 1;

  }

  // TODO(debargha, jingning): Temporarily disable txk_type check for eob=0

  // case. It is possible that certain collision in hash index would cause

  // the assertion failure. To further optimize the rate-distortion

  // performance, we need to re-visit this part and enable this assert

  // again.

  if (p->eobs[block] == 0 && plane == 0) {

#if 0

    if (args->cpi->oxcf.q_cfg.aq_mode == NO_AQ &&

        args->cpi->oxcf.q_cfg.deltaq_mode == NO_DELTA_Q) {

      // TODO(jingning,angiebird,huisu@google.com): enable txk_check when

      // enable_optimize_b is true to detect potential RD bug.

      const uint8_t disable_txk_check = args->enable_optimize_b;

      if (!disable_txk_check) {

        assert(xd->tx_type_map[blk_row * xd->tx_type_map_stride + blk_col)] ==

            DCT_DCT);

      }

    }

#endif

    update_txk_array(xd, blk_row, blk_col, tx_size, DCT_DCT);

  }

#if CONFIG_MISMATCH_DEBUG

  if (dry_run == OUTPUT_ENABLED) {

    int pixel_c, pixel_r;

    BLOCK_SIZE bsize = txsize_to_bsize[tx_size];

    int blk_w = block_size_wide[bsize];

    int blk_h = block_size_high[bsize];

    mi_to_pixel_loc(&pixel_c, &pixel_r, xd->mi_col, xd->mi_row, blk_col,

                    blk_row, pd->subsampling_x, pd->subsampling_y);

    mismatch_record_block_tx(dst, pd->dst.stride, cm->current_frame.order_hint,

                             plane, pixel_c, pixel_r, blk_w, blk_h,

                             xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH);

  }

#endif

}

static void encode_block_inter(int plane, int block, int blk_row, int blk_col,

                               BLOCK_SIZE plane_bsize, TX_SIZE tx_size,

                               void *arg, RUN_TYPE dry_run) {

  struct encode_b_args *const args = arg;

  MACROBLOCK *const x = args->x;

  MACROBLOCKD *const xd = &x->e_mbd;

  MB_MODE_INFO *const mbmi = xd->mi[0];

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

  const int max_blocks_high = max_block_high(xd, plane_bsize, plane);

  const int max_blocks_wide = max_block_wide(xd, plane_bsize, plane);

  if (blk_row >= max_blocks_high || blk_col >= max_blocks_wide) return;

  const TX_SIZE plane_tx_size =

      plane ? av1_get_max_uv_txsize(mbmi->bsize, pd->subsampling_x,

                                    pd->subsampling_y)

            : mbmi->inter_tx_size[av1_get_txb_size_index(plane_bsize, blk_row,

                                                         blk_col)];

  if (!plane) {

    assert(tx_size_wide[tx_size] >= tx_size_wide[plane_tx_size] &&

           tx_size_high[tx_size] >= tx_size_high[plane_tx_size]);

  }

  if (tx_size == plane_tx_size || plane) {

    encode_block(plane, block, blk_row, blk_col, plane_bsize, tx_size, arg,

                 dry_run);

  } else {

    assert(tx_size < TX_SIZES_ALL);

    const TX_SIZE sub_txs = sub_tx_size_map[tx_size];

    assert(IMPLIES(tx_size <= TX_4X4, sub_txs == tx_size));

    assert(IMPLIES(tx_size > TX_4X4, sub_txs < tx_size));

    // This is the square transform block partition entry point.

    const int bsw = tx_size_wide_unit[sub_txs];

    const int bsh = tx_size_high_unit[sub_txs];

    const int step = bsh * bsw;

    const int row_end =

        AOMMIN(tx_size_high_unit[tx_size], max_blocks_high - blk_row);

    const int col_end =

        AOMMIN(tx_size_wide_unit[tx_size], max_blocks_wide - blk_col);

    assert(bsw > 0 && bsh > 0);

    for (int row = 0; row < row_end; row += bsh) {

      const int offsetr = blk_row + row;

      for (int col = 0; col < col_end; col += bsw) {

        const int offsetc = blk_col + col;

        encode_block_inter(plane, block, offsetr, offsetc, plane_bsize, sub_txs,

                           arg, dry_run);

        block += step;

      }

    }

  }

}

void av1_foreach_transformed_block_in_plane(

    const MACROBLOCKD *const xd, BLOCK_SIZE plane_bsize, int plane,

    foreach_transformed_block_visitor visit, void *arg) {

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

  // block and transform sizes, in number of 4x4 blocks log 2 ("*_b")

  // 4x4=0, 8x8=2, 16x16=4, 32x32=6, 64x64=8

  // transform size varies per plane, look it up in a common way.

  const TX_SIZE tx_size = av1_get_tx_size(plane, xd);

  const BLOCK_SIZE tx_bsize = txsize_to_bsize[tx_size];

  // Call visit() directly with zero offsets if the current block size is the

  // same as the transform block size.

  if (plane_bsize == tx_bsize) {

    visit(plane, 0, 0, 0, plane_bsize, tx_size, arg);

    return;

  }

  const uint8_t txw_unit = tx_size_wide_unit[tx_size];

  const uint8_t txh_unit = tx_size_high_unit[tx_size];

  const int step = txw_unit * txh_unit;

  // If mb_to_right_edge is < 0 we are in a situation in which

  // the current block size extends into the UMV and we won't

  // visit the sub blocks that are wholly within the UMV.

  const int max_blocks_wide = max_block_wide(xd, plane_bsize, plane);

  const int max_blocks_high = max_block_high(xd, plane_bsize, plane);

  const BLOCK_SIZE max_unit_bsize =

      get_plane_block_size(BLOCK_64X64, pd->subsampling_x, pd->subsampling_y);

  const int mu_blocks_wide =

      AOMMIN(mi_size_wide[max_unit_bsize], max_blocks_wide);

  const int mu_blocks_high =

      AOMMIN(mi_size_high[max_unit_bsize], max_blocks_high);

  // Keep track of the row and column of the blocks we use so that we know

  // if we are in the unrestricted motion border.

  int i = 0;

  for (int r = 0; r < max_blocks_high; r += mu_blocks_high) {

    const int unit_height = AOMMIN(mu_blocks_high + r, max_blocks_high);

    // Skip visiting the sub blocks that are wholly within the UMV.

    for (int c = 0; c < max_blocks_wide; c += mu_blocks_wide) {

      const int unit_width = AOMMIN(mu_blocks_wide + c, max_blocks_wide);

      for (int blk_row = r; blk_row < unit_height; blk_row += txh_unit) {

        for (int blk_col = c; blk_col < unit_width; blk_col += txw_unit) {

          visit(plane, i, blk_row, blk_col, plane_bsize, tx_size, arg);

          i += step;

        }

      }

    }

  }

  // Check if visit() is invoked at least once.

  assert(i >= 1);

}

typedef struct encode_block_pass1_args {

  AV1_COMP *cpi;

  MACROBLOCK *x;

} encode_block_pass1_args;

static void encode_block_pass1(int plane, int block, int blk_row, int blk_col,

                               BLOCK_SIZE plane_bsize, TX_SIZE tx_size,

                               void *arg) {

  encode_block_pass1_args *args = (encode_block_pass1_args *)arg;

  AV1_COMP *cpi = args->cpi;

  AV1_COMMON *cm = &cpi->common;

  MACROBLOCK *const x = args->x;

  MACROBLOCKD *const xd = &x->e_mbd;

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

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

  tran_low_t *const dqcoeff = p->dqcoeff + BLOCK_OFFSET(block);

  uint8_t *dst;

  dst = &pd->dst.buf[(blk_row * pd->dst.stride + blk_col) << MI_SIZE_LOG2];

  TxfmParam txfm_param;

  QUANT_PARAM quant_param;

  av1_setup_xform(cm, x, tx_size, DCT_DCT, &txfm_param);

  av1_setup_quant(tx_size, 0, AV1_XFORM_QUANT_B, cpi->oxcf.q_cfg.quant_b_adapt,

                  &quant_param);

  av1_setup_qmatrix(&cm->quant_params, xd, plane, tx_size, DCT_DCT,

                    &quant_param);

  av1_xform_quant(x, plane, block, blk_row, blk_col, plane_bsize, &txfm_param,

                  &quant_param);

  if (p->eobs[block] > 0) {

    txfm_param.eob = p->eobs[block];

    if (txfm_param.is_hbd) {

      av1_highbd_inv_txfm_add(dqcoeff, dst, pd->dst.stride, &txfm_param);

      return;

    }

    av1_inv_txfm_add(dqcoeff, dst, pd->dst.stride, &txfm_param);

  }

}

void av1_encode_sby_pass1(AV1_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bsize) {

  encode_block_pass1_args args = { cpi, x };

  av1_subtract_plane(x, bsize, 0);

  av1_foreach_transformed_block_in_plane(&x->e_mbd, bsize, 0,

                                         encode_block_pass1, &args);

}

void av1_encode_sb(const struct AV1_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bsize,

                   RUN_TYPE dry_run) {

  assert(bsize < BLOCK_SIZES_ALL);

  MACROBLOCKD *const xd = &x->e_mbd;

  MB_MODE_INFO *mbmi = xd->mi[0];

  // In the current encoder implementation, for inter blocks,

  // only when YUV planes all have zero quantized transform coefficients,

  // mbmi->skip_txfm flag is set to 1.

  // For intra blocks, this flag is set to 0 since skipped blocks are so rare

  // that transmitting skip_txfm = 1 is very expensive.

  // mbmi->skip_txfm is init to 1, and will be modified in encode_block() based

  // on transform, quantization, and (if exists) trellis optimization.

  mbmi->skip_txfm = 1;

  if (x->txfm_search_info.skip_txfm) return;

  struct optimize_ctx ctx;

  struct encode_b_args arg = {

    cpi, x, &ctx, NULL, NULL, dry_run, cpi->optimize_seg_arr[mbmi->segment_id]

  };

  const AV1_COMMON *const cm = &cpi->common;

  const int num_planes = av1_num_planes(cm);

  for (int plane = 0; plane < num_planes; ++plane) {

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

    const int subsampling_x = pd->subsampling_x;

    const int subsampling_y = pd->subsampling_y;

    if (plane && !xd->is_chroma_ref) break;

    const BLOCK_SIZE plane_bsize =

        get_plane_block_size(bsize, subsampling_x, subsampling_y);

    assert(plane_bsize < BLOCK_SIZES_ALL);

    const int mi_width = mi_size_wide[plane_bsize];

    const int mi_height = mi_size_high[plane_bsize];

    const TX_SIZE max_tx_size = get_vartx_max_txsize(xd, plane_bsize, plane);

    const BLOCK_SIZE txb_size = txsize_to_bsize[max_tx_size];

    const int bw = mi_size_wide[txb_size];

    const int bh = mi_size_high[txb_size];

    int block = 0;

    const int step =

        tx_size_wide_unit[max_tx_size] * tx_size_high_unit[max_tx_size];

    av1_get_entropy_contexts(plane_bsize, pd, ctx.ta[plane], ctx.tl[plane]);

    av1_subtract_plane(x, plane_bsize, plane);

    arg.ta = ctx.ta[plane];

    arg.tl = ctx.tl[plane];

    const BLOCK_SIZE max_unit_bsize =

        get_plane_block_size(BLOCK_64X64, subsampling_x, subsampling_y);

    int mu_blocks_wide = mi_size_wide[max_unit_bsize];

    int mu_blocks_high = mi_size_high[max_unit_bsize];

    mu_blocks_wide = AOMMIN(mi_width, mu_blocks_wide);

    mu_blocks_high = AOMMIN(mi_height, mu_blocks_high);

    for (int idy = 0; idy < mi_height; idy += mu_blocks_high) {

      for (int idx = 0; idx < mi_width; idx += mu_blocks_wide) {

        int blk_row, blk_col;

        const int unit_height = AOMMIN(mu_blocks_high + idy, mi_height);

        const int unit_width = AOMMIN(mu_blocks_wide + idx, mi_width);

        for (blk_row = idy; blk_row < unit_height; blk_row += bh) {

          for (blk_col = idx; blk_col < unit_width; blk_col += bw) {

            encode_block_inter(plane, block, blk_row, blk_col, plane_bsize,

                               max_tx_size, &arg, dry_run);

            block += step;

          }

        }

      }

    }

  }

}

static void encode_block_intra(int plane, int block, int blk_row, int blk_col,

                               BLOCK_SIZE plane_bsize, TX_SIZE tx_size,

                               void *arg) {

  struct encode_b_args *const args = arg;

  const AV1_COMP *const cpi = args->cpi;

  const AV1_COMMON *const cm = &cpi->common;

  MACROBLOCK *const x = args->x;

  MACROBLOCKD *const xd = &x->e_mbd;

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

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

  tran_low_t *dqcoeff = p->dqcoeff + BLOCK_OFFSET(block);

  PLANE_TYPE plane_type = get_plane_type(plane);

  uint16_t *eob = &p->eobs[block];

  const int dst_stride = pd->dst.stride;

  uint8_t *dst = &pd->dst.buf[(blk_row * dst_stride + blk_col) << MI_SIZE_LOG2];

  int dummy_rate_cost = 0;

  av1_predict_intra_block_facade(cm, xd, plane, blk_col, blk_row, tx_size);

  TX_TYPE tx_type = DCT_DCT;

  if (xd->mi[0]->skip_txfm) {

    *eob = 0;

    p->txb_entropy_ctx[block] = 0;

  } else {

    av1_subtract_txb(x, plane, plane_bsize, blk_col, blk_row, tx_size);

    const ENTROPY_CONTEXT *a = &args->ta[blk_col];

    const ENTROPY_CONTEXT *l = &args->tl[blk_row];

    tx_type = av1_get_tx_type(xd, plane_type, blk_row, blk_col, tx_size,

                              cm->features.reduced_tx_set_used);

    TxfmParam txfm_param;

    QUANT_PARAM quant_param;

    const int use_trellis =

        is_trellis_used(args->enable_optimize_b, args->dry_run);

    int quant_idx;

    if (use_trellis)

      quant_idx = AV1_XFORM_QUANT_FP;

    else

      quant_idx =

          USE_B_QUANT_NO_TRELLIS ? AV1_XFORM_QUANT_B : AV1_XFORM_QUANT_FP;

    av1_setup_xform(cm, x, tx_size, tx_type, &txfm_param);

    av1_setup_quant(tx_size, use_trellis, quant_idx,

                    cpi->oxcf.q_cfg.quant_b_adapt, &quant_param);

    av1_setup_qmatrix(&cm->quant_params, xd, plane, tx_size, tx_type,

                      &quant_param);

    av1_xform_quant(x, plane, block, blk_row, blk_col, plane_bsize, &txfm_param,

                    &quant_param);

    if (use_trellis) {

      TXB_CTX txb_ctx;

      get_txb_ctx(plane_bsize, tx_size, plane, a, l, &txb_ctx);

      av1_optimize_b(args->cpi, x, plane, block, tx_size, tx_type, &txb_ctx,

                     &dummy_rate_cost);

    }

  }

  if (*eob) {

    av1_inverse_transform_block(xd, dqcoeff, plane, tx_type, tx_size, dst,

                                dst_stride, *eob,

                                cm->features.reduced_tx_set_used);

  }

  // TODO(jingning): Temporarily disable txk_type check for eob=0 case.

  // It is possible that certain collision in hash index would cause

  // the assertion failure. To further optimize the rate-distortion

  // performance, we need to re-visit this part and enable this assert

  // again.

  if (*eob == 0 && plane == 0) {

#if 0

    if (args->cpi->oxcf.q_cfg.aq_mode == NO_AQ

        && args->cpi->oxcf.q_cfg.deltaq_mode == NO_DELTA_Q) {

      assert(xd->tx_type_map[blk_row * xd->tx_type_map_stride + blk_col)] ==

          DCT_DCT);

    }

#endif

    update_txk_array(xd, blk_row, blk_col, tx_size, DCT_DCT);

  }

#if !CONFIG_REALTIME_ONLY

  if (plane == AOM_PLANE_Y && xd->cfl.store_y) {

    cfl_store_tx(xd, blk_row, blk_col, tx_size, plane_bsize);

  }

#endif

}

static void encode_block_intra_and_set_context(int plane, int block,

                                               int blk_row, int blk_col,

                                               BLOCK_SIZE plane_bsize,

                                               TX_SIZE tx_size, void *arg) {

  encode_block_intra(plane, block, blk_row, blk_col, plane_bsize, tx_size, arg);

  struct encode_b_args *const args = arg;

  MACROBLOCK *x = args->x;

  ENTROPY_CONTEXT *a = &args->ta[blk_col];

  ENTROPY_CONTEXT *l = &args->tl[blk_row];

  av1_set_txb_context(x, plane, block, tx_size, a, l);

}

void av1_encode_intra_block_plane(const struct AV1_COMP *cpi, MACROBLOCK *x,

                                  BLOCK_SIZE bsize, int plane, RUN_TYPE dry_run,

                                  TRELLIS_OPT_TYPE enable_optimize_b) {

  assert(bsize < BLOCK_SIZES_ALL);

  const MACROBLOCKD *const xd = &x->e_mbd;

  if (plane && !xd->is_chroma_ref) return;

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

  const int ss_x = pd->subsampling_x;

  const int ss_y = pd->subsampling_y;

  ENTROPY_CONTEXT ta[MAX_MIB_SIZE] = { 0 };

  ENTROPY_CONTEXT tl[MAX_MIB_SIZE] = { 0 };

  struct encode_b_args arg = {

    cpi, x, NULL, ta, tl, dry_run, enable_optimize_b

  };

  const BLOCK_SIZE plane_bsize = get_plane_block_size(bsize, ss_x, ss_y);

  if (enable_optimize_b) {

    av1_get_entropy_contexts(plane_bsize, pd, ta, tl);

  }

  av1_foreach_transformed_block_in_plane(

      xd, plane_bsize, plane, encode_block_intra_and_set_context, &arg);

}