hevc_cabac.c 49.6 KB
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/*
 * HEVC CABAC decoding
 *
 * Copyright (C) 2012 - 2013 Guillaume Martres
 * Copyright (C) 2012 - 2013 Gildas Cocherel
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "libavutil/attributes.h"
#include "libavutil/common.h"

#include "cabac_functions.h"
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#include "hevc_data.h"
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#include "hevc.h"
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#include "hevcdec.h"
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#define CABAC_MAX_BIN 31
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/**
 * number of bin by SyntaxElement.
 */
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static const int8_t num_bins_in_se[] = {
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     1, // sao_merge_flag
     1, // sao_type_idx
     0, // sao_eo_class
     0, // sao_band_position
     0, // sao_offset_abs
     0, // sao_offset_sign
     0, // end_of_slice_flag
     3, // split_coding_unit_flag
     1, // cu_transquant_bypass_flag
     3, // skip_flag
     3, // cu_qp_delta
     1, // pred_mode
     4, // part_mode
     0, // pcm_flag
     1, // prev_intra_luma_pred_mode
     0, // mpm_idx
     0, // rem_intra_luma_pred_mode
     2, // intra_chroma_pred_mode
     1, // merge_flag
     1, // merge_idx
     5, // inter_pred_idc
     2, // ref_idx_l0
     2, // ref_idx_l1
     2, // abs_mvd_greater0_flag
     2, // abs_mvd_greater1_flag
     0, // abs_mvd_minus2
     0, // mvd_sign_flag
     1, // mvp_lx_flag
     1, // no_residual_data_flag
     3, // split_transform_flag
     2, // cbf_luma
     4, // cbf_cb, cbf_cr
     2, // transform_skip_flag[][]
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     2, // explicit_rdpcm_flag[][]
     2, // explicit_rdpcm_dir_flag[][]
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    18, // last_significant_coeff_x_prefix
    18, // last_significant_coeff_y_prefix
     0, // last_significant_coeff_x_suffix
     0, // last_significant_coeff_y_suffix
     4, // significant_coeff_group_flag
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    44, // significant_coeff_flag
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    24, // coeff_abs_level_greater1_flag
     6, // coeff_abs_level_greater2_flag
     0, // coeff_abs_level_remaining
     0, // coeff_sign_flag
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     8, // log2_res_scale_abs
     2, // res_scale_sign_flag
     1, // cu_chroma_qp_offset_flag
     1, // cu_chroma_qp_offset_idx
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};

/**
 * Offset to ctxIdx 0 in init_values and states, indexed by SyntaxElement.
 */
static const int elem_offset[sizeof(num_bins_in_se)] = {
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    0, // sao_merge_flag
    1, // sao_type_idx
    2, // sao_eo_class
    2, // sao_band_position
    2, // sao_offset_abs
    2, // sao_offset_sign
    2, // end_of_slice_flag
    2, // split_coding_unit_flag
    5, // cu_transquant_bypass_flag
    6, // skip_flag
    9, // cu_qp_delta
    12, // pred_mode
    13, // part_mode
    17, // pcm_flag
    17, // prev_intra_luma_pred_mode
    18, // mpm_idx
    18, // rem_intra_luma_pred_mode
    18, // intra_chroma_pred_mode
    20, // merge_flag
    21, // merge_idx
    22, // inter_pred_idc
    27, // ref_idx_l0
    29, // ref_idx_l1
    31, // abs_mvd_greater0_flag
    33, // abs_mvd_greater1_flag
    35, // abs_mvd_minus2
    35, // mvd_sign_flag
    35, // mvp_lx_flag
    36, // no_residual_data_flag
    37, // split_transform_flag
    40, // cbf_luma
    42, // cbf_cb, cbf_cr
    46, // transform_skip_flag[][]
    48, // explicit_rdpcm_flag[][]
    50, // explicit_rdpcm_dir_flag[][]
    52, // last_significant_coeff_x_prefix
    70, // last_significant_coeff_y_prefix
    88, // last_significant_coeff_x_suffix
    88, // last_significant_coeff_y_suffix
    88, // significant_coeff_group_flag
    92, // significant_coeff_flag
    136, // coeff_abs_level_greater1_flag
    160, // coeff_abs_level_greater2_flag
    166, // coeff_abs_level_remaining
    166, // coeff_sign_flag
    166, // log2_res_scale_abs
    174, // res_scale_sign_flag
    176, // cu_chroma_qp_offset_flag
    177, // cu_chroma_qp_offset_idx
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};

#define CNU 154
/**
 * Indexed by init_type
 */
static const uint8_t init_values[3][HEVC_CONTEXTS] = {
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    { // sao_merge_flag
      153,
      // sao_type_idx
      200,
      // split_coding_unit_flag
      139, 141, 157,
      // cu_transquant_bypass_flag
      154,
      // skip_flag
      CNU, CNU, CNU,
      // cu_qp_delta
      154, 154, 154,
      // pred_mode
      CNU,
      // part_mode
      184, CNU, CNU, CNU,
      // prev_intra_luma_pred_mode
      184,
      // intra_chroma_pred_mode
      63, 139,
      // merge_flag
      CNU,
      // merge_idx
      CNU,
      // inter_pred_idc
      CNU, CNU, CNU, CNU, CNU,
      // ref_idx_l0
      CNU, CNU,
      // ref_idx_l1
      CNU, CNU,
      // abs_mvd_greater1_flag
      CNU, CNU,
      // abs_mvd_greater1_flag
      CNU, CNU,
      // mvp_lx_flag
      CNU,
      // no_residual_data_flag
      CNU,
      // split_transform_flag
      153, 138, 138,
      // cbf_luma
      111, 141,
      // cbf_cb, cbf_cr
      94, 138, 182, 154,
      // transform_skip_flag
      139, 139,
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      // explicit_rdpcm_flag
      139, 139,
      // explicit_rdpcm_dir_flag
      139, 139,
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      // last_significant_coeff_x_prefix
      110, 110, 124, 125, 140, 153, 125, 127, 140, 109, 111, 143, 127, 111,
       79, 108, 123,  63,
      // last_significant_coeff_y_prefix
      110, 110, 124, 125, 140, 153, 125, 127, 140, 109, 111, 143, 127, 111,
       79, 108, 123,  63,
      // significant_coeff_group_flag
      91, 171, 134, 141,
      // significant_coeff_flag
      111, 111, 125, 110, 110,  94, 124, 108, 124, 107, 125, 141, 179, 153,
      125, 107, 125, 141, 179, 153, 125, 107, 125, 141, 179, 153, 125, 140,
      139, 182, 182, 152, 136, 152, 136, 153, 136, 139, 111, 136, 139, 111,
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      141, 111,
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      // coeff_abs_level_greater1_flag
      140,  92, 137, 138, 140, 152, 138, 139, 153,  74, 149,  92, 139, 107,
      122, 152, 140, 179, 166, 182, 140, 227, 122, 197,
      // coeff_abs_level_greater2_flag
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      138, 153, 136, 167, 152, 152,
      // log2_res_scale_abs
      154, 154, 154, 154, 154, 154, 154, 154,
      // res_scale_sign_flag
      154, 154,
      // cu_chroma_qp_offset_flag
      154,
      // cu_chroma_qp_offset_idx
      154,
    },
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    { // sao_merge_flag
      153,
      // sao_type_idx
      185,
      // split_coding_unit_flag
      107, 139, 126,
      // cu_transquant_bypass_flag
      154,
      // skip_flag
      197, 185, 201,
      // cu_qp_delta
      154, 154, 154,
      // pred_mode
      149,
      // part_mode
      154, 139, 154, 154,
      // prev_intra_luma_pred_mode
      154,
      // intra_chroma_pred_mode
      152, 139,
      // merge_flag
      110,
      // merge_idx
      122,
      // inter_pred_idc
      95, 79, 63, 31, 31,
      // ref_idx_l0
      153, 153,
      // ref_idx_l1
      153, 153,
      // abs_mvd_greater1_flag
      140, 198,
      // abs_mvd_greater1_flag
      140, 198,
      // mvp_lx_flag
      168,
      // no_residual_data_flag
      79,
      // split_transform_flag
      124, 138, 94,
      // cbf_luma
      153, 111,
      // cbf_cb, cbf_cr
      149, 107, 167, 154,
      // transform_skip_flag
      139, 139,
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      // explicit_rdpcm_flag
      139, 139,
      // explicit_rdpcm_dir_flag
      139, 139,
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      // last_significant_coeff_x_prefix
      125, 110,  94, 110,  95,  79, 125, 111, 110,  78, 110, 111, 111,  95,
       94, 108, 123, 108,
      // last_significant_coeff_y_prefix
      125, 110,  94, 110,  95,  79, 125, 111, 110,  78, 110, 111, 111,  95,
       94, 108, 123, 108,
      // significant_coeff_group_flag
      121, 140, 61, 154,
      // significant_coeff_flag
      155, 154, 139, 153, 139, 123, 123,  63, 153, 166, 183, 140, 136, 153,
      154, 166, 183, 140, 136, 153, 154, 166, 183, 140, 136, 153, 154, 170,
      153, 123, 123, 107, 121, 107, 121, 167, 151, 183, 140, 151, 183, 140,
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      140, 140,
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      // coeff_abs_level_greater1_flag
      154, 196, 196, 167, 154, 152, 167, 182, 182, 134, 149, 136, 153, 121,
      136, 137, 169, 194, 166, 167, 154, 167, 137, 182,
      // coeff_abs_level_greater2_flag
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      107, 167, 91, 122, 107, 167,
      // log2_res_scale_abs
      154, 154, 154, 154, 154, 154, 154, 154,
      // res_scale_sign_flag
      154, 154,
      // cu_chroma_qp_offset_flag
      154,
      // cu_chroma_qp_offset_idx
      154,
    },
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    { // sao_merge_flag
      153,
      // sao_type_idx
      160,
      // split_coding_unit_flag
      107, 139, 126,
      // cu_transquant_bypass_flag
      154,
      // skip_flag
      197, 185, 201,
      // cu_qp_delta
      154, 154, 154,
      // pred_mode
      134,
      // part_mode
      154, 139, 154, 154,
      // prev_intra_luma_pred_mode
      183,
      // intra_chroma_pred_mode
      152, 139,
      // merge_flag
      154,
      // merge_idx
      137,
      // inter_pred_idc
      95, 79, 63, 31, 31,
      // ref_idx_l0
      153, 153,
      // ref_idx_l1
      153, 153,
      // abs_mvd_greater1_flag
      169, 198,
      // abs_mvd_greater1_flag
      169, 198,
      // mvp_lx_flag
      168,
      // no_residual_data_flag
      79,
      // split_transform_flag
      224, 167, 122,
      // cbf_luma
      153, 111,
      // cbf_cb, cbf_cr
      149, 92, 167, 154,
      // transform_skip_flag
      139, 139,
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      // explicit_rdpcm_flag
      139, 139,
      // explicit_rdpcm_dir_flag
      139, 139,
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      // last_significant_coeff_x_prefix
      125, 110, 124, 110,  95,  94, 125, 111, 111,  79, 125, 126, 111, 111,
       79, 108, 123,  93,
      // last_significant_coeff_y_prefix
      125, 110, 124, 110,  95,  94, 125, 111, 111,  79, 125, 126, 111, 111,
       79, 108, 123,  93,
      // significant_coeff_group_flag
      121, 140, 61, 154,
      // significant_coeff_flag
      170, 154, 139, 153, 139, 123, 123,  63, 124, 166, 183, 140, 136, 153,
      154, 166, 183, 140, 136, 153, 154, 166, 183, 140, 136, 153, 154, 170,
      153, 138, 138, 122, 121, 122, 121, 167, 151, 183, 140, 151, 183, 140,
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      140, 140,
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      // coeff_abs_level_greater1_flag
      154, 196, 167, 167, 154, 152, 167, 182, 182, 134, 149, 136, 153, 121,
      136, 122, 169, 208, 166, 167, 154, 152, 167, 182,
      // coeff_abs_level_greater2_flag
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      107, 167, 91, 107, 107, 167,
      // log2_res_scale_abs
      154, 154, 154, 154, 154, 154, 154, 154,
      // res_scale_sign_flag
      154, 154,
      // cu_chroma_qp_offset_flag
      154,
      // cu_chroma_qp_offset_idx
      154,
    },
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};

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static const uint8_t scan_1x1[1] = {
    0,
};

static const uint8_t horiz_scan2x2_x[4] = {
    0, 1, 0, 1,
};

static const uint8_t horiz_scan2x2_y[4] = {
    0, 0, 1, 1
};

static const uint8_t horiz_scan4x4_x[16] = {
    0, 1, 2, 3,
    0, 1, 2, 3,
    0, 1, 2, 3,
    0, 1, 2, 3,
};

static const uint8_t horiz_scan4x4_y[16] = {
    0, 0, 0, 0,
    1, 1, 1, 1,
    2, 2, 2, 2,
    3, 3, 3, 3,
};

static const uint8_t horiz_scan8x8_inv[8][8] = {
    {  0,  1,  2,  3, 16, 17, 18, 19, },
    {  4,  5,  6,  7, 20, 21, 22, 23, },
    {  8,  9, 10, 11, 24, 25, 26, 27, },
    { 12, 13, 14, 15, 28, 29, 30, 31, },
    { 32, 33, 34, 35, 48, 49, 50, 51, },
    { 36, 37, 38, 39, 52, 53, 54, 55, },
    { 40, 41, 42, 43, 56, 57, 58, 59, },
    { 44, 45, 46, 47, 60, 61, 62, 63, },
};

static const uint8_t diag_scan2x2_x[4] = {
    0, 0, 1, 1,
};

static const uint8_t diag_scan2x2_y[4] = {
    0, 1, 0, 1,
};

static const uint8_t diag_scan2x2_inv[2][2] = {
    { 0, 2, },
    { 1, 3, },
};

static const uint8_t diag_scan4x4_inv[4][4] = {
    { 0,  2,  5,  9, },
    { 1,  4,  8, 12, },
    { 3,  7, 11, 14, },
    { 6, 10, 13, 15, },
};

static const uint8_t diag_scan8x8_inv[8][8] = {
    {  0,  2,  5,  9, 14, 20, 27, 35, },
    {  1,  4,  8, 13, 19, 26, 34, 42, },
    {  3,  7, 12, 18, 25, 33, 41, 48, },
    {  6, 11, 17, 24, 32, 40, 47, 53, },
    { 10, 16, 23, 31, 39, 46, 52, 57, },
    { 15, 22, 30, 38, 45, 51, 56, 60, },
    { 21, 29, 37, 44, 50, 55, 59, 62, },
    { 28, 36, 43, 49, 54, 58, 61, 63, },
};

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void ff_hevc_save_states(HEVCContext *s, int ctb_addr_ts)
{
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    if (s->ps.pps->entropy_coding_sync_enabled_flag &&
        (ctb_addr_ts % s->ps.sps->ctb_width == 2 ||
         (s->ps.sps->ctb_width == 2 &&
          ctb_addr_ts % s->ps.sps->ctb_width == 0))) {
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        memcpy(s->cabac_state, s->HEVClc->cabac_state, HEVC_CONTEXTS);
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    }
}

static void load_states(HEVCContext *s)
{
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    memcpy(s->HEVClc->cabac_state, s->cabac_state, HEVC_CONTEXTS);
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}

static void cabac_reinit(HEVCLocalContext *lc)
{
    skip_bytes(&lc->cc, 0);
}

static void cabac_init_decoder(HEVCContext *s)
{
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    GetBitContext *gb = &s->HEVClc->gb;
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    skip_bits(gb, 1);
    align_get_bits(gb);
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    ff_init_cabac_decoder(&s->HEVClc->cc,
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                          gb->buffer + get_bits_count(gb) / 8,
                          (get_bits_left(gb) + 7) / 8);
}

static void cabac_init_state(HEVCContext *s)
{
    int init_type = 2 - s->sh.slice_type;
    int i;

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    if (s->sh.cabac_init_flag && s->sh.slice_type != HEVC_SLICE_I)
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        init_type ^= 3;

    for (i = 0; i < HEVC_CONTEXTS; i++) {
        int init_value = init_values[init_type][i];
        int m = (init_value >> 4) * 5 - 45;
        int n = ((init_value & 15) << 3) - 16;
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        int pre = 2 * (((m * av_clip(s->sh.slice_qp, 0, 51)) >> 4) + n) - 127;
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        pre ^= pre >> 31;
        if (pre > 124)
            pre = 124 + (pre & 1);
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        s->HEVClc->cabac_state[i] = pre;
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    }
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    for (i = 0; i < 4; i++)
        s->HEVClc->stat_coeff[i] = 0;
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}

void ff_hevc_cabac_init(HEVCContext *s, int ctb_addr_ts)
{
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    if (ctb_addr_ts == s->ps.pps->ctb_addr_rs_to_ts[s->sh.slice_ctb_addr_rs]) {
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        cabac_init_decoder(s);
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        if (s->sh.dependent_slice_segment_flag == 0 ||
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            (s->ps.pps->tiles_enabled_flag &&
             s->ps.pps->tile_id[ctb_addr_ts] != s->ps.pps->tile_id[ctb_addr_ts - 1]))
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            cabac_init_state(s);

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        if (!s->sh.first_slice_in_pic_flag &&
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            s->ps.pps->entropy_coding_sync_enabled_flag) {
            if (ctb_addr_ts % s->ps.sps->ctb_width == 0) {
                if (s->ps.sps->ctb_width == 1)
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                    cabac_init_state(s);
                else if (s->sh.dependent_slice_segment_flag == 1)
                    load_states(s);
            }
        }
    } else {
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        if (s->ps.pps->tiles_enabled_flag &&
            s->ps.pps->tile_id[ctb_addr_ts] != s->ps.pps->tile_id[ctb_addr_ts - 1]) {
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            if (s->threads_number == 1)
                cabac_reinit(s->HEVClc);
            else
                cabac_init_decoder(s);
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            cabac_init_state(s);
        }
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        if (s->ps.pps->entropy_coding_sync_enabled_flag) {
            if (ctb_addr_ts % s->ps.sps->ctb_width == 0) {
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                get_cabac_terminate(&s->HEVClc->cc);
                if (s->threads_number == 1)
                    cabac_reinit(s->HEVClc);
                else
                    cabac_init_decoder(s);
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                if (s->ps.sps->ctb_width == 1)
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                    cabac_init_state(s);
                else
                    load_states(s);
            }
        }
    }
}

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#define GET_CABAC(ctx) get_cabac(&s->HEVClc->cc, &s->HEVClc->cabac_state[ctx])
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int ff_hevc_sao_merge_flag_decode(HEVCContext *s)
{
    return GET_CABAC(elem_offset[SAO_MERGE_FLAG]);
}

int ff_hevc_sao_type_idx_decode(HEVCContext *s)
{
    if (!GET_CABAC(elem_offset[SAO_TYPE_IDX]))
        return 0;

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    if (!get_cabac_bypass(&s->HEVClc->cc))
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        return SAO_BAND;
    return SAO_EDGE;
}

int ff_hevc_sao_band_position_decode(HEVCContext *s)
{
    int i;
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    int value = get_cabac_bypass(&s->HEVClc->cc);
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    for (i = 0; i < 4; i++)
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        value = (value << 1) | get_cabac_bypass(&s->HEVClc->cc);
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    return value;
}

int ff_hevc_sao_offset_abs_decode(HEVCContext *s)
{
    int i = 0;
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    int length = (1 << (FFMIN(s->ps.sps->bit_depth, 10) - 5)) - 1;
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    while (i < length && get_cabac_bypass(&s->HEVClc->cc))
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        i++;
    return i;
}

int ff_hevc_sao_offset_sign_decode(HEVCContext *s)
{
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    return get_cabac_bypass(&s->HEVClc->cc);
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}

int ff_hevc_sao_eo_class_decode(HEVCContext *s)
{
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    int ret = get_cabac_bypass(&s->HEVClc->cc) << 1;
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    ret    |= get_cabac_bypass(&s->HEVClc->cc);
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    return ret;
}

int ff_hevc_end_of_slice_flag_decode(HEVCContext *s)
{
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    return get_cabac_terminate(&s->HEVClc->cc);
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}

int ff_hevc_cu_transquant_bypass_flag_decode(HEVCContext *s)
{
    return GET_CABAC(elem_offset[CU_TRANSQUANT_BYPASS_FLAG]);
}

int ff_hevc_skip_flag_decode(HEVCContext *s, int x0, int y0, int x_cb, int y_cb)
{
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    int min_cb_width = s->ps.sps->min_cb_width;
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    int inc = 0;
611 612
    int x0b = av_mod_uintp2(x0, s->ps.sps->log2_ctb_size);
    int y0b = av_mod_uintp2(y0, s->ps.sps->log2_ctb_size);
613

614
    if (s->HEVClc->ctb_left_flag || x0b)
615
        inc = !!SAMPLE_CTB(s->skip_flag, x_cb - 1, y_cb);
616
    if (s->HEVClc->ctb_up_flag || y0b)
617
        inc += !!SAMPLE_CTB(s->skip_flag, x_cb, y_cb - 1);
618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633

    return GET_CABAC(elem_offset[SKIP_FLAG] + inc);
}

int ff_hevc_cu_qp_delta_abs(HEVCContext *s)
{
    int prefix_val = 0;
    int suffix_val = 0;
    int inc = 0;

    while (prefix_val < 5 && GET_CABAC(elem_offset[CU_QP_DELTA] + inc)) {
        prefix_val++;
        inc = 1;
    }
    if (prefix_val >= 5) {
        int k = 0;
634
        while (k < CABAC_MAX_BIN && get_cabac_bypass(&s->HEVClc->cc)) {
635 636 637 638 639 640 641
            suffix_val += 1 << k;
            k++;
        }
        if (k == CABAC_MAX_BIN)
            av_log(s->avctx, AV_LOG_ERROR, "CABAC_MAX_BIN : %d\n", k);

        while (k--)
642
            suffix_val += get_cabac_bypass(&s->HEVClc->cc) << k;
643 644 645 646 647 648
    }
    return prefix_val + suffix_val;
}

int ff_hevc_cu_qp_delta_sign_flag(HEVCContext *s)
{
649
    return get_cabac_bypass(&s->HEVClc->cc);
650 651
}

652 653 654 655 656 657 658
int ff_hevc_cu_chroma_qp_offset_flag(HEVCContext *s)
{
    return GET_CABAC(elem_offset[CU_CHROMA_QP_OFFSET_FLAG]);
}

int ff_hevc_cu_chroma_qp_offset_idx(HEVCContext *s)
{
659
    int c_max= FFMAX(5, s->ps.pps->chroma_qp_offset_list_len_minus1);
660 661 662 663 664 665 666 667
    int i = 0;

    while (i < c_max && GET_CABAC(elem_offset[CU_CHROMA_QP_OFFSET_IDX]))
        i++;

    return i;
}

668 669 670 671 672 673 674 675
int ff_hevc_pred_mode_decode(HEVCContext *s)
{
    return GET_CABAC(elem_offset[PRED_MODE_FLAG]);
}

int ff_hevc_split_coding_unit_flag_decode(HEVCContext *s, int ct_depth, int x0, int y0)
{
    int inc = 0, depth_left = 0, depth_top = 0;
676 677
    int x0b  = av_mod_uintp2(x0, s->ps.sps->log2_ctb_size);
    int y0b  = av_mod_uintp2(y0, s->ps.sps->log2_ctb_size);
678 679
    int x_cb = x0 >> s->ps.sps->log2_min_cb_size;
    int y_cb = y0 >> s->ps.sps->log2_min_cb_size;
680

681
    if (s->HEVClc->ctb_left_flag || x0b)
682
        depth_left = s->tab_ct_depth[(y_cb) * s->ps.sps->min_cb_width + x_cb - 1];
683
    if (s->HEVClc->ctb_up_flag || y0b)
684
        depth_top = s->tab_ct_depth[(y_cb - 1) * s->ps.sps->min_cb_width + x_cb];
685 686

    inc += (depth_left > ct_depth);
687 688
    inc += (depth_top  > ct_depth);

689 690 691 692 693 694 695
    return GET_CABAC(elem_offset[SPLIT_CODING_UNIT_FLAG] + inc);
}

int ff_hevc_part_mode_decode(HEVCContext *s, int log2_cb_size)
{
    if (GET_CABAC(elem_offset[PART_MODE])) // 1
        return PART_2Nx2N;
696
    if (log2_cb_size == s->ps.sps->log2_min_cb_size) {
697
        if (s->HEVClc->cu.pred_mode == MODE_INTRA) // 0
698 699 700 701 702 703 704 705 706 707
            return PART_NxN;
        if (GET_CABAC(elem_offset[PART_MODE] + 1)) // 01
            return PART_2NxN;
        if (log2_cb_size == 3) // 00
            return PART_Nx2N;
        if (GET_CABAC(elem_offset[PART_MODE] + 2)) // 001
            return PART_Nx2N;
        return PART_NxN; // 000
    }

708
    if (!s->ps.sps->amp_enabled_flag) {
709 710 711 712 713 714 715 716
        if (GET_CABAC(elem_offset[PART_MODE] + 1)) // 01
            return PART_2NxN;
        return PART_Nx2N;
    }

    if (GET_CABAC(elem_offset[PART_MODE] + 1)) { // 01X, 01XX
        if (GET_CABAC(elem_offset[PART_MODE] + 3)) // 011
            return PART_2NxN;
717
        if (get_cabac_bypass(&s->HEVClc->cc)) // 0101
718 719 720 721 722 723
            return PART_2NxnD;
        return PART_2NxnU; // 0100
    }

    if (GET_CABAC(elem_offset[PART_MODE] + 3)) // 001
        return PART_Nx2N;
724
    if (get_cabac_bypass(&s->HEVClc->cc)) // 0001
725
        return PART_nRx2N;
726
    return PART_nLx2N;  // 0000
727 728 729 730
}

int ff_hevc_pcm_flag_decode(HEVCContext *s)
{
731
    return get_cabac_terminate(&s->HEVClc->cc);
732 733 734 735 736 737 738 739 740 741
}

int ff_hevc_prev_intra_luma_pred_flag_decode(HEVCContext *s)
{
    return GET_CABAC(elem_offset[PREV_INTRA_LUMA_PRED_FLAG]);
}

int ff_hevc_mpm_idx_decode(HEVCContext *s)
{
    int i = 0;
742
    while (i < 2 && get_cabac_bypass(&s->HEVClc->cc))
743 744 745 746 747 748 749
        i++;
    return i;
}

int ff_hevc_rem_intra_luma_pred_mode_decode(HEVCContext *s)
{
    int i;
750
    int value = get_cabac_bypass(&s->HEVClc->cc);
751 752

    for (i = 0; i < 4; i++)
753
        value = (value << 1) | get_cabac_bypass(&s->HEVClc->cc);
754 755 756 757 758 759 760 761 762
    return value;
}

int ff_hevc_intra_chroma_pred_mode_decode(HEVCContext *s)
{
    int ret;
    if (!GET_CABAC(elem_offset[INTRA_CHROMA_PRED_MODE]))
        return 4;

763
    ret  = get_cabac_bypass(&s->HEVClc->cc) << 1;
764
    ret |= get_cabac_bypass(&s->HEVClc->cc);
765 766 767 768 769 770 771 772
    return ret;
}

int ff_hevc_merge_idx_decode(HEVCContext *s)
{
    int i = GET_CABAC(elem_offset[MERGE_IDX]);

    if (i != 0) {
773
        while (i < s->sh.max_num_merge_cand-1 && get_cabac_bypass(&s->HEVClc->cc))
774 775 776 777 778 779 780 781 782 783 784 785 786 787
            i++;
    }
    return i;
}

int ff_hevc_merge_flag_decode(HEVCContext *s)
{
    return GET_CABAC(elem_offset[MERGE_FLAG]);
}

int ff_hevc_inter_pred_idc_decode(HEVCContext *s, int nPbW, int nPbH)
{
    if (nPbW + nPbH == 12)
        return GET_CABAC(elem_offset[INTER_PRED_IDC] + 4);
788
    if (GET_CABAC(elem_offset[INTER_PRED_IDC] + s->HEVClc->ct_depth))
789 790 791 792 793 794 795 796 797 798 799 800 801 802
        return PRED_BI;

    return GET_CABAC(elem_offset[INTER_PRED_IDC] + 4);
}

int ff_hevc_ref_idx_lx_decode(HEVCContext *s, int num_ref_idx_lx)
{
    int i = 0;
    int max = num_ref_idx_lx - 1;
    int max_ctx = FFMIN(max, 2);

    while (i < max_ctx && GET_CABAC(elem_offset[REF_IDX_L0] + i))
        i++;
    if (i == 2) {
803
        while (i < max && get_cabac_bypass(&s->HEVClc->cc))
804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819
            i++;
    }

    return i;
}

int ff_hevc_mvp_lx_flag_decode(HEVCContext *s)
{
    return GET_CABAC(elem_offset[MVP_LX_FLAG]);
}

int ff_hevc_no_residual_syntax_flag_decode(HEVCContext *s)
{
    return GET_CABAC(elem_offset[NO_RESIDUAL_DATA_FLAG]);
}

820
static av_always_inline int abs_mvd_greater0_flag_decode(HEVCContext *s)
821 822 823 824
{
    return GET_CABAC(elem_offset[ABS_MVD_GREATER0_FLAG]);
}

825
static av_always_inline int abs_mvd_greater1_flag_decode(HEVCContext *s)
826 827 828 829
{
    return GET_CABAC(elem_offset[ABS_MVD_GREATER1_FLAG] + 1);
}

830
static av_always_inline int mvd_decode(HEVCContext *s)
831 832 833 834
{
    int ret = 2;
    int k = 1;

835
    while (k < CABAC_MAX_BIN && get_cabac_bypass(&s->HEVClc->cc)) {
836
        ret += 1U << k;
837 838
        k++;
    }
839
    if (k == CABAC_MAX_BIN) {
840
        av_log(s->avctx, AV_LOG_ERROR, "CABAC_MAX_BIN : %d\n", k);
841 842
        return 0;
    }
843
    while (k--)
844 845
        ret += get_cabac_bypass(&s->HEVClc->cc) << k;
    return get_cabac_bypass_sign(&s->HEVClc->cc, -ret);
846 847
}

848
static av_always_inline int mvd_sign_flag_decode(HEVCContext *s)
849
{
850
    return get_cabac_bypass_sign(&s->HEVClc->cc, -1);
851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867
}

int ff_hevc_split_transform_flag_decode(HEVCContext *s, int log2_trafo_size)
{
    return GET_CABAC(elem_offset[SPLIT_TRANSFORM_FLAG] + 5 - log2_trafo_size);
}

int ff_hevc_cbf_cb_cr_decode(HEVCContext *s, int trafo_depth)
{
    return GET_CABAC(elem_offset[CBF_CB_CR] + trafo_depth);
}

int ff_hevc_cbf_luma_decode(HEVCContext *s, int trafo_depth)
{
    return GET_CABAC(elem_offset[CBF_LUMA] + !trafo_depth);
}

868
static int hevc_transform_skip_flag_decode(HEVCContext *s, int c_idx)
869 870 871 872
{
    return GET_CABAC(elem_offset[TRANSFORM_SKIP_FLAG] + !!c_idx);
}

873 874 875 876
static int explicit_rdpcm_flag_decode(HEVCContext *s, int c_idx)
{
    return GET_CABAC(elem_offset[EXPLICIT_RDPCM_FLAG] + !!c_idx);
}
877

878
static int explicit_rdpcm_dir_flag_decode(HEVCContext *s, int c_idx)
879
{
880 881 882 883 884 885 886 887 888 889
    return GET_CABAC(elem_offset[EXPLICIT_RDPCM_DIR_FLAG] + !!c_idx);
}

int ff_hevc_log2_res_scale_abs(HEVCContext *s, int idx) {
    int i =0;

    while (i < 4 && GET_CABAC(elem_offset[LOG2_RES_SCALE_ABS] + 4 * idx + i))
        i++;

    return i;
890 891
}

892 893 894 895 896 897
int ff_hevc_res_scale_sign_flag(HEVCContext *s, int idx) {
    return GET_CABAC(elem_offset[RES_SCALE_SIGN_FLAG] + idx);
}

static av_always_inline void last_significant_coeff_xy_prefix_decode(HEVCContext *s, int c_idx,
                                                   int log2_size, int *last_scx_prefix, int *last_scy_prefix)
898
{
899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919
    int i = 0;
    int max = (log2_size << 1) - 1;
    int ctx_offset, ctx_shift;

    if (!c_idx) {
        ctx_offset = 3 * (log2_size - 2)  + ((log2_size - 1) >> 2);
        ctx_shift = (log2_size + 1) >> 2;
    } else {
        ctx_offset = 15;
        ctx_shift = log2_size - 2;
    }
    while (i < max &&
           GET_CABAC(elem_offset[LAST_SIGNIFICANT_COEFF_X_PREFIX] + (i >> ctx_shift) + ctx_offset))
        i++;
    *last_scx_prefix = i;

    i = 0;
    while (i < max &&
           GET_CABAC(elem_offset[LAST_SIGNIFICANT_COEFF_Y_PREFIX] + (i >> ctx_shift) + ctx_offset))
        i++;
    *last_scy_prefix = i;
920 921
}

922
static av_always_inline int last_significant_coeff_suffix_decode(HEVCContext *s,
923 924 925 926
                                                 int last_significant_coeff_prefix)
{
    int i;
    int length = (last_significant_coeff_prefix >> 1) - 1;
927
    int value = get_cabac_bypass(&s->HEVClc->cc);
928 929

    for (i = 1; i < length; i++)
930
        value = (value << 1) | get_cabac_bypass(&s->HEVClc->cc);
931 932 933
    return value;
}

934
static av_always_inline int significant_coeff_group_flag_decode(HEVCContext *s, int c_idx, int ctx_cg)
935 936 937 938 939 940 941
{
    int inc;

    inc = FFMIN(ctx_cg, 1) + (c_idx>0 ? 2 : 0);

    return GET_CABAC(elem_offset[SIGNIFICANT_COEFF_GROUP_FLAG] + inc);
}
942 943
static av_always_inline int significant_coeff_flag_decode(HEVCContext *s, int x_c, int y_c,
                                           int offset, const uint8_t *ctx_idx_map)
944
{
945
    int inc = ctx_idx_map[(y_c << 2) + x_c] + offset;
946 947 948
    return GET_CABAC(elem_offset[SIGNIFICANT_COEFF_FLAG] + inc);
}

949 950 951 952 953
static av_always_inline int significant_coeff_flag_decode_0(HEVCContext *s, int c_idx, int offset)
{
    return GET_CABAC(elem_offset[SIGNIFICANT_COEFF_FLAG] + offset);
}

954
static av_always_inline int coeff_abs_level_greater1_flag_decode(HEVCContext *s, int c_idx, int inc)
955 956 957 958 959
{

    if (c_idx > 0)
        inc += 16;

960
    return GET_CABAC(elem_offset[COEFF_ABS_LEVEL_GREATER1_FLAG] + inc);
961 962
}

963
static av_always_inline int coeff_abs_level_greater2_flag_decode(HEVCContext *s, int c_idx, int inc)
964 965 966 967 968 969 970
{
    if (c_idx > 0)
        inc += 4;

    return GET_CABAC(elem_offset[COEFF_ABS_LEVEL_GREATER2_FLAG] + inc);
}

971
static av_always_inline int coeff_abs_level_remaining_decode(HEVCContext *s, int rc_rice_param)
972 973 974
{
    int prefix = 0;
    int suffix = 0;
975 976
    int last_coeff_abs_level_remaining;
    int i;
977

978
    while (prefix < CABAC_MAX_BIN && get_cabac_bypass(&s->HEVClc->cc))
979
        prefix++;
980
    if (prefix == CABAC_MAX_BIN) {
981
        av_log(s->avctx, AV_LOG_ERROR, "CABAC_MAX_BIN : %d\n", prefix);
982 983
        return 0;
    }
984
    if (prefix < 3) {
985
        for (i = 0; i < rc_rice_param; i++)
986
            suffix = (suffix << 1) | get_cabac_bypass(&s->HEVClc->cc);
987
        last_coeff_abs_level_remaining = (prefix << rc_rice_param) + suffix;
988
    } else {
989 990
        int prefix_minus3 = prefix - 3;
        for (i = 0; i < prefix_minus3 + rc_rice_param; i++)
991
            suffix = (suffix << 1) | get_cabac_bypass(&s->HEVClc->cc);
992 993
        last_coeff_abs_level_remaining = (((1 << prefix_minus3) + 3 - 1)
                                              << rc_rice_param) + suffix;
994
    }
995
    return last_coeff_abs_level_remaining;
996 997
}

998
static av_always_inline int coeff_sign_flag_decode(HEVCContext *s, uint8_t nb)
999 1000 1001 1002 1003
{
    int i;
    int ret = 0;

    for (i = 0; i < nb; i++)
1004
        ret = (ret << 1) | get_cabac_bypass(&s->HEVClc->cc);
1005 1006
    return ret;
}
1007 1008 1009 1010 1011 1012 1013

void ff_hevc_hls_residual_coding(HEVCContext *s, int x0, int y0,
                                int log2_trafo_size, enum ScanType scan_idx,
                                int c_idx)
{
#define GET_COORD(offset, n)                                    \
    do {                                                        \
1014 1015
        x_c = (x_cg << 2) + scan_x_off[n];                      \
        y_c = (y_cg << 2) + scan_y_off[n];                      \
1016
    } while (0)
1017
    HEVCLocalContext *lc = s->HEVClc;
1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031
    int transform_skip_flag = 0;

    int last_significant_coeff_x, last_significant_coeff_y;
    int last_scan_pos;
    int n_end;
    int num_coeff = 0;
    int greater1_ctx = 1;

    int num_last_subset;
    int x_cg_last_sig, y_cg_last_sig;

    const uint8_t *scan_x_cg, *scan_y_cg, *scan_x_off, *scan_y_off;

    ptrdiff_t stride = s->frame->linesize[c_idx];
1032 1033
    int hshift = s->ps.sps->hshift[c_idx];
    int vshift = s->ps.sps->vshift[c_idx];
1034
    uint8_t *dst = &s->frame->data[c_idx][(y0 >> vshift) * stride +
1035
                                          ((x0 >> hshift) << s->ps.sps->pixel_shift)];
1036
    int16_t *coeffs = (int16_t*)(c_idx ? lc->edge_emu_buffer2 : lc->edge_emu_buffer);
1037 1038 1039
    uint8_t significant_coeff_group_flag[8][8] = {{0}};
    int explicit_rdpcm_flag = 0;
    int explicit_rdpcm_dir_flag;
1040 1041 1042 1043

    int trafo_size = 1 << log2_trafo_size;
    int i;
    int qp,shift,add,scale,scale_m;
1044
    static const uint8_t level_scale[] = { 40, 45, 51, 57, 64, 72 };
1045
    const uint8_t *scale_matrix = NULL;
1046
    uint8_t dc_scale;
1047 1048 1049 1050
    int pred_mode_intra = (c_idx == 0) ? lc->tu.intra_pred_mode :
                                         lc->tu.intra_pred_mode_c;

    memset(coeffs, 0, trafo_size * trafo_size * sizeof(int16_t));
1051 1052 1053 1054

    // Derive QP for dequant
    if (!lc->cu.cu_transquant_bypass_flag) {
        static const int qp_c[] = { 29, 30, 31, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37 };
1055
        static const uint8_t rem6[51 + 4 * 6 + 1] = {
1056 1057 1058
            0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2,
            3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5,
            0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3,
1059
            4, 5, 0, 1, 2, 3, 4, 5, 0, 1
1060 1061
        };

1062
        static const uint8_t div6[51 + 4 * 6 + 1] = {
1063 1064 1065
            0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3,  3,  3,
            3, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6,  6,  6,
            7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10,
1066
            10, 10, 11, 11, 11, 11, 11, 11, 12, 12
1067 1068 1069
        };
        int qp_y = lc->qp_y;

1070 1071
        if (s->ps.pps->transform_skip_enabled_flag &&
            log2_trafo_size <= s->ps.pps->log2_max_transform_skip_block_size) {
1072
            transform_skip_flag = hevc_transform_skip_flag_decode(s, c_idx);
1073 1074
        }

1075
        if (c_idx == 0) {
1076
            qp = qp_y + s->ps.sps->qp_bd_offset;
1077 1078 1079 1080
        } else {
            int qp_i, offset;

            if (c_idx == 1)
1081
                offset = s->ps.pps->cb_qp_offset + s->sh.slice_cb_qp_offset +
1082
                         lc->tu.cu_qp_offset_cb;
1083
            else
1084
                offset = s->ps.pps->cr_qp_offset + s->sh.slice_cr_qp_offset +
1085
                         lc->tu.cu_qp_offset_cr;
1086

1087 1088
            qp_i = av_clip(qp_y + offset, - s->ps.sps->qp_bd_offset, 57);
            if (s->ps.sps->chroma_format_idc == 1) {
1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100
                if (qp_i < 30)
                    qp = qp_i;
                else if (qp_i > 43)
                    qp = qp_i - 6;
                else
                    qp = qp_c[qp_i - 30];
            } else {
                if (qp_i > 51)
                    qp = 51;
                else
                    qp = qp_i;
            }
1101

1102
            qp += s->ps.sps->qp_bd_offset;
1103 1104
        }

1105
        shift    = s->ps.sps->bit_depth + log2_trafo_size - 5;
1106 1107 1108 1109 1110
        add      = 1 << (shift-1);
        scale    = level_scale[rem6[qp]] << (div6[qp]);
        scale_m  = 16; // default when no custom scaling lists.
        dc_scale = 16;

1111 1112 1113
        if (s->ps.sps->scaling_list_enable_flag && !(transform_skip_flag && log2_trafo_size > 2)) {
            const ScalingList *sl = s->ps.pps->scaling_list_data_present_flag ?
            &s->ps.pps->scaling_list : &s->ps.sps->scaling_list;
1114 1115
            int matrix_id = lc->cu.pred_mode != MODE_INTRA;

1116
            matrix_id = 3 * matrix_id + c_idx;
1117 1118 1119 1120 1121

            scale_matrix = sl->sl[log2_trafo_size - 2][matrix_id];
            if (log2_trafo_size >= 4)
                dc_scale = sl->sl_dc[log2_trafo_size - 4][matrix_id];
        }
1122 1123 1124 1125 1126
    } else {
        shift        = 0;
        add          = 0;
        scale        = 0;
        dc_scale     = 0;
1127 1128
    }

1129
    if (lc->cu.pred_mode == MODE_INTER && s->ps.sps->explicit_rdpcm_enabled_flag &&
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        (transform_skip_flag || lc->cu.cu_transquant_bypass_flag)) {
        explicit_rdpcm_flag = explicit_rdpcm_flag_decode(s, c_idx);
        if (explicit_rdpcm_flag) {
            explicit_rdpcm_dir_flag = explicit_rdpcm_dir_flag_decode(s, c_idx);
        }
    }

    last_significant_coeff_xy_prefix_decode(s, c_idx, log2_trafo_size,
                                           &last_significant_coeff_x, &last_significant_coeff_y);
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    if (last_significant_coeff_x > 3) {
        int suffix = last_significant_coeff_suffix_decode(s, last_significant_coeff_x);
        last_significant_coeff_x = (1 << ((last_significant_coeff_x >> 1) - 1)) *
        (2 + (last_significant_coeff_x & 1)) +
        suffix;
    }

    if (last_significant_coeff_y > 3) {
        int suffix = last_significant_coeff_suffix_decode(s, last_significant_coeff_y);
        last_significant_coeff_y = (1 << ((last_significant_coeff_y >> 1) - 1)) *
        (2 + (last_significant_coeff_y & 1)) +
        suffix;
    }

    if (scan_idx == SCAN_VERT)
        FFSWAP(int, last_significant_coeff_x, last_significant_coeff_y);

    x_cg_last_sig = last_significant_coeff_x >> 2;
    y_cg_last_sig = last_significant_coeff_y >> 2;

    switch (scan_idx) {
    case SCAN_DIAG: {
        int last_x_c = last_significant_coeff_x & 3;
        int last_y_c = last_significant_coeff_y & 3;

        scan_x_off = ff_hevc_diag_scan4x4_x;
        scan_y_off = ff_hevc_diag_scan4x4_y;
        num_coeff = diag_scan4x4_inv[last_y_c][last_x_c];
        if (trafo_size == 4) {
            scan_x_cg = scan_1x1;
            scan_y_cg = scan_1x1;
        } else if (trafo_size == 8) {
            num_coeff += diag_scan2x2_inv[y_cg_last_sig][x_cg_last_sig] << 4;
            scan_x_cg = diag_scan2x2_x;
            scan_y_cg = diag_scan2x2_y;
        } else if (trafo_size == 16) {
            num_coeff += diag_scan4x4_inv[y_cg_last_sig][x_cg_last_sig] << 4;
            scan_x_cg = ff_hevc_diag_scan4x4_x;
            scan_y_cg = ff_hevc_diag_scan4x4_y;
        } else { // trafo_size == 32
            num_coeff += diag_scan8x8_inv[y_cg_last_sig][x_cg_last_sig] << 4;
            scan_x_cg = ff_hevc_diag_scan8x8_x;
            scan_y_cg = ff_hevc_diag_scan8x8_y;
        }
        break;
    }
    case SCAN_HORIZ:
        scan_x_cg = horiz_scan2x2_x;
        scan_y_cg = horiz_scan2x2_y;
        scan_x_off = horiz_scan4x4_x;
        scan_y_off = horiz_scan4x4_y;
        num_coeff = horiz_scan8x8_inv[last_significant_coeff_y][last_significant_coeff_x];
        break;
    default: //SCAN_VERT
        scan_x_cg = horiz_scan2x2_y;
        scan_y_cg = horiz_scan2x2_x;
        scan_x_off = horiz_scan4x4_y;
        scan_y_off = horiz_scan4x4_x;
        num_coeff = horiz_scan8x8_inv[last_significant_coeff_x][last_significant_coeff_y];
        break;
    }
    num_coeff++;
    num_last_subset = (num_coeff - 1) >> 4;

    for (i = num_last_subset; i >= 0; i--) {
        int n, m;
        int x_cg, y_cg, x_c, y_c, pos;
        int implicit_non_zero_coeff = 0;
        int64_t trans_coeff_level;
        int prev_sig = 0;
        int offset = i << 4;
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        int rice_init = 0;
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        uint8_t significant_coeff_flag_idx[16];
        uint8_t nb_significant_coeff_flag = 0;

        x_cg = scan_x_cg[i];
        y_cg = scan_y_cg[i];

        if ((i < num_last_subset) && (i > 0)) {
            int ctx_cg = 0;
            if (x_cg < (1 << (log2_trafo_size - 2)) - 1)
                ctx_cg += significant_coeff_group_flag[x_cg + 1][y_cg];
            if (y_cg < (1 << (log2_trafo_size - 2)) - 1)
                ctx_cg += significant_coeff_group_flag[x_cg][y_cg + 1];

            significant_coeff_group_flag[x_cg][y_cg] =
                significant_coeff_group_flag_decode(s, c_idx, ctx_cg);
            implicit_non_zero_coeff = 1;
        } else {
            significant_coeff_group_flag[x_cg][y_cg] =
            ((x_cg == x_cg_last_sig && y_cg == y_cg_last_sig) ||
             (x_cg == 0 && y_cg == 0));
        }

        last_scan_pos = num_coeff - offset - 1;

        if (i == num_last_subset) {
            n_end = last_scan_pos - 1;
            significant_coeff_flag_idx[0] = last_scan_pos;
            nb_significant_coeff_flag = 1;
        } else {
            n_end = 15;
        }

        if (x_cg < ((1 << log2_trafo_size) - 1) >> 2)
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            prev_sig = !!significant_coeff_group_flag[x_cg + 1][y_cg];
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        if (y_cg < ((1 << log2_trafo_size) - 1) >> 2)
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            prev_sig += (!!significant_coeff_group_flag[x_cg][y_cg + 1] << 1);

        if (significant_coeff_group_flag[x_cg][y_cg] && n_end >= 0) {
            static const uint8_t ctx_idx_map[] = {
                0, 1, 4, 5, 2, 3, 4, 5, 6, 6, 8, 8, 7, 7, 8, 8, // log2_trafo_size == 2
                1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, // prev_sig == 0
                2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, // prev_sig == 1
                2, 1, 0, 0, 2, 1, 0, 0, 2, 1, 0, 0, 2, 1, 0, 0, // prev_sig == 2
                2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2  // default
            };
            const uint8_t *ctx_idx_map_p;
            int scf_offset = 0;
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            if (s->ps.sps->transform_skip_context_enabled_flag &&
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                (transform_skip_flag || lc->cu.cu_transquant_bypass_flag)) {
                ctx_idx_map_p = (uint8_t*) &ctx_idx_map[4 * 16];
                if (c_idx == 0) {
                    scf_offset = 40;
                } else {
                    scf_offset = 14 + 27;
                }
            } else {
                if (c_idx != 0)
                    scf_offset = 27;
                if (log2_trafo_size == 2) {
                    ctx_idx_map_p = (uint8_t*) &ctx_idx_map[0];
                } else {
                    ctx_idx_map_p = (uint8_t*) &ctx_idx_map[(prev_sig + 1) << 4];
                    if (c_idx == 0) {
                        if ((x_cg > 0 || y_cg > 0))
                            scf_offset += 3;
                        if (log2_trafo_size == 3) {
                            scf_offset += (scan_idx == SCAN_DIAG) ? 9 : 15;
                        } else {
                            scf_offset += 21;
                        }
                    } else {
                        if (log2_trafo_size == 3)
                            scf_offset += 9;
                        else
                            scf_offset += 12;
                    }
                }
            }
            for (n = n_end; n > 0; n--) {
                x_c = scan_x_off[n];
                y_c = scan_y_off[n];
                if (significant_coeff_flag_decode(s, x_c, y_c, scf_offset, ctx_idx_map_p)) {
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                    significant_coeff_flag_idx[nb_significant_coeff_flag] = n;
                    nb_significant_coeff_flag++;
                    implicit_non_zero_coeff = 0;
                }
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            }
            if (implicit_non_zero_coeff == 0) {
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                if (s->ps.sps->transform_skip_context_enabled_flag &&
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                    (transform_skip_flag || lc->cu.cu_transquant_bypass_flag)) {
                    if (c_idx == 0) {
                        scf_offset = 42;
                    } else {
                        scf_offset = 16 + 27;
                    }
                } else {
                    if (i == 0) {
                        if (c_idx == 0)
                            scf_offset = 0;
                        else
                            scf_offset = 27;
                    } else {
                        scf_offset = 2 + scf_offset;
                    }
                }
                if (significant_coeff_flag_decode_0(s, c_idx, scf_offset) == 1) {
                    significant_coeff_flag_idx[nb_significant_coeff_flag] = 0;
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                    nb_significant_coeff_flag++;
                }
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            } else {
                significant_coeff_flag_idx[nb_significant_coeff_flag] = 0;
                nb_significant_coeff_flag++;
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            }
        }

        n_end = nb_significant_coeff_flag;


        if (n_end) {
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            int first_nz_pos_in_cg;
            int last_nz_pos_in_cg;
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            int c_rice_param = 0;
            int first_greater1_coeff_idx = -1;
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            uint8_t coeff_abs_level_greater1_flag[8];
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            uint16_t coeff_sign_flag;
            int sum_abs = 0;
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            int sign_hidden;
            int sb_type;

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            // initialize first elem of coeff_bas_level_greater1_flag
            int ctx_set = (i > 0 && c_idx == 0) ? 2 : 0;

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            if (s->ps.sps->persistent_rice_adaptation_enabled_flag) {
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                if (!transform_skip_flag && !lc->cu.cu_transquant_bypass_flag)
                    sb_type = 2 * (c_idx == 0 ? 1 : 0);
                else
                    sb_type = 2 * (c_idx == 0 ? 1 : 0) + 1;
                c_rice_param = lc->stat_coeff[sb_type] / 4;
            }

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            if (!(i == num_last_subset) && greater1_ctx == 0)
                ctx_set++;
            greater1_ctx = 1;
            last_nz_pos_in_cg = significant_coeff_flag_idx[0];

            for (m = 0; m < (n_end > 8 ? 8 : n_end); m++) {
                int inc = (ctx_set << 2) + greater1_ctx;
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                coeff_abs_level_greater1_flag[m] =
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                    coeff_abs_level_greater1_flag_decode(s, c_idx, inc);
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                if (coeff_abs_level_greater1_flag[m]) {
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                    greater1_ctx = 0;
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                    if (first_greater1_coeff_idx == -1)
                        first_greater1_coeff_idx = m;
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                } else if (greater1_ctx > 0 && greater1_ctx < 3) {
                    greater1_ctx++;
                }
            }
            first_nz_pos_in_cg = significant_coeff_flag_idx[n_end - 1];
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            if (lc->cu.cu_transquant_bypass_flag ||
                (lc->cu.pred_mode ==  MODE_INTRA  &&
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                 s->ps.sps->implicit_rdpcm_enabled_flag  &&  transform_skip_flag  &&
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                 (pred_mode_intra == 10 || pred_mode_intra  ==  26 )) ||
                 explicit_rdpcm_flag)
                sign_hidden = 0;
            else
                sign_hidden = (last_nz_pos_in_cg - first_nz_pos_in_cg >= 4);
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            if (first_greater1_coeff_idx != -1) {
                coeff_abs_level_greater1_flag[first_greater1_coeff_idx] += coeff_abs_level_greater2_flag_decode(s, c_idx, ctx_set);
            }
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            if (!s->ps.pps->sign_data_hiding_flag || !sign_hidden ) {
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                coeff_sign_flag = coeff_sign_flag_decode(s, nb_significant_coeff_flag) << (16 - nb_significant_coeff_flag);
            } else {
                coeff_sign_flag = coeff_sign_flag_decode(s, nb_significant_coeff_flag - 1) << (16 - (nb_significant_coeff_flag - 1));
            }

            for (m = 0; m < n_end; m++) {
                n = significant_coeff_flag_idx[m];
                GET_COORD(offset, n);
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                if (m < 8) {
                    trans_coeff_level = 1 + coeff_abs_level_greater1_flag[m];
                    if (trans_coeff_level == ((m == first_greater1_coeff_idx) ? 3 : 2)) {
                        int last_coeff_abs_level_remaining = coeff_abs_level_remaining_decode(s, c_rice_param);

                        trans_coeff_level += last_coeff_abs_level_remaining;
                        if (trans_coeff_level > (3 << c_rice_param))
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                            c_rice_param = s->ps.sps->persistent_rice_adaptation_enabled_flag ? c_rice_param + 1 : FFMIN(c_rice_param + 1, 4);
                        if (s->ps.sps->persistent_rice_adaptation_enabled_flag && !rice_init) {
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                            int c_rice_p_init = lc->stat_coeff[sb_type] / 4;
                            if (last_coeff_abs_level_remaining >= (3 << c_rice_p_init))
                                lc->stat_coeff[sb_type]++;
                            else if (2 * last_coeff_abs_level_remaining < (1 << c_rice_p_init))
                                if (lc->stat_coeff[sb_type] > 0)
                                    lc->stat_coeff[sb_type]--;
                            rice_init = 1;
                        }
                    }
                } else {
                    int last_coeff_abs_level_remaining = coeff_abs_level_remaining_decode(s, c_rice_param);
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                    trans_coeff_level = 1 + last_coeff_abs_level_remaining;
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                    if (trans_coeff_level > (3 << c_rice_param))
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                        c_rice_param = s->ps.sps->persistent_rice_adaptation_enabled_flag ? c_rice_param + 1 : FFMIN(c_rice_param + 1, 4);
                    if (s->ps.sps->persistent_rice_adaptation_enabled_flag && !rice_init) {
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                        int c_rice_p_init = lc->stat_coeff[sb_type] / 4;
                        if (last_coeff_abs_level_remaining >= (3 << c_rice_p_init))
                            lc->stat_coeff[sb_type]++;
                        else if (2 * last_coeff_abs_level_remaining < (1 << c_rice_p_init))
                            if (lc->stat_coeff[sb_type] > 0)
                                lc->stat_coeff[sb_type]--;
                        rice_init = 1;
                    }
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                }
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                if (s->ps.pps->sign_data_hiding_flag && sign_hidden) {
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                    sum_abs += trans_coeff_level;
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                    if (n == first_nz_pos_in_cg && (sum_abs&1))
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                        trans_coeff_level = -trans_coeff_level;
                }
                if (coeff_sign_flag >> 15)
                    trans_coeff_level = -trans_coeff_level;
                coeff_sign_flag <<= 1;
                if(!lc->cu.cu_transquant_bypass_flag) {
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                    if (s->ps.sps->scaling_list_enable_flag && !(transform_skip_flag && log2_trafo_size > 2)) {
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                        if(y_c || x_c || log2_trafo_size < 4) {
                            switch(log2_trafo_size) {
                                case 3: pos = (y_c << 3) + x_c; break;
                                case 4: pos = ((y_c >> 1) << 3) + (x_c >> 1); break;
                                case 5: pos = ((y_c >> 2) << 3) + (x_c >> 2); break;
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                                default: pos = (y_c << 2) + x_c; break;
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                            }
                            scale_m = scale_matrix[pos];
                        } else {
                            scale_m = dc_scale;
                        }
                    }
                    trans_coeff_level = (trans_coeff_level * (int64_t)scale * (int64_t)scale_m + add) >> shift;
                    if(trans_coeff_level < 0) {
                        if((~trans_coeff_level) & 0xFffffffffff8000)
                            trans_coeff_level = -32768;
                    } else {
                        if(trans_coeff_level & 0xffffffffffff8000)
                            trans_coeff_level = 32767;
                    }
                }
                coeffs[y_c * trafo_size + x_c] = trans_coeff_level;
            }
        }
    }

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    if (lc->cu.cu_transquant_bypass_flag) {
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        if (explicit_rdpcm_flag || (s->ps.sps->implicit_rdpcm_enabled_flag &&
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                                    (pred_mode_intra == 10 || pred_mode_intra == 26))) {
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            int mode = s->ps.sps->implicit_rdpcm_enabled_flag ? (pred_mode_intra == 26) : explicit_rdpcm_dir_flag;
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            s->hevcdsp.transform_rdpcm(coeffs, log2_trafo_size, mode);
        }
    } else {
        if (transform_skip_flag) {
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            int rot = s->ps.sps->transform_skip_rotation_enabled_flag &&
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                      log2_trafo_size == 2 &&
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                      lc->cu.pred_mode == MODE_INTRA;
            if (rot) {
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                for (i = 0; i < 8; i++)
                    FFSWAP(int16_t, coeffs[i], coeffs[16 - i - 1]);
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            }

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            s->hevcdsp.dequant(coeffs, log2_trafo_size);
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            if (explicit_rdpcm_flag || (s->ps.sps->implicit_rdpcm_enabled_flag &&
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                                        lc->cu.pred_mode == MODE_INTRA &&
                                        (pred_mode_intra == 10 || pred_mode_intra == 26))) {
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                int mode = explicit_rdpcm_flag ? explicit_rdpcm_dir_flag : (pred_mode_intra == 26);
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                s->hevcdsp.transform_rdpcm(coeffs, log2_trafo_size, mode);
            }
        } else if (lc->cu.pred_mode == MODE_INTRA && c_idx == 0 && log2_trafo_size == 2) {
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            s->hevcdsp.transform_4x4_luma(coeffs);
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        } else {
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            int max_xy = FFMAX(last_significant_coeff_x, last_significant_coeff_y);
            if (max_xy == 0)
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                s->hevcdsp.idct_dc[log2_trafo_size - 2](coeffs);
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            else {
                int col_limit = last_significant_coeff_x + last_significant_coeff_y + 4;
                if (max_xy < 4)
                    col_limit = FFMIN(4, col_limit);
                else if (max_xy < 8)
                    col_limit = FFMIN(8, col_limit);
                else if (max_xy < 12)
                    col_limit = FFMIN(24, col_limit);
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                s->hevcdsp.idct[log2_trafo_size - 2](coeffs, col_limit);
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            }
        }
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    }
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    if (lc->tu.cross_pf) {
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        int16_t *coeffs_y = (int16_t*)lc->edge_emu_buffer;
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        for (i = 0; i < (trafo_size * trafo_size); i++) {
            coeffs[i] = coeffs[i] + ((lc->tu.res_scale_val * coeffs_y[i]) >> 3);
        }
    }
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    s->hevcdsp.add_residual[log2_trafo_size-2](dst, coeffs, stride);
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}

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void ff_hevc_hls_mvd_coding(HEVCContext *s, int x0, int y0, int log2_cb_size)
{
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    HEVCLocalContext *lc = s->HEVClc;
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    int x = abs_mvd_greater0_flag_decode(s);
    int y = abs_mvd_greater0_flag_decode(s);

    if (x)
        x += abs_mvd_greater1_flag_decode(s);
    if (y)
        y += abs_mvd_greater1_flag_decode(s);

    switch (x) {
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    case 2: lc->pu.mvd.x = mvd_decode(s);           break;
    case 1: lc->pu.mvd.x = mvd_sign_flag_decode(s); break;
    case 0: lc->pu.mvd.x = 0;                       break;
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    }

    switch (y) {
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    case 2: lc->pu.mvd.y = mvd_decode(s);           break;
    case 1: lc->pu.mvd.y = mvd_sign_flag_decode(s); break;
    case 0: lc->pu.mvd.y = 0;                       break;
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    }
}