hevc_cabac.c 50 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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}

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static int cabac_reinit(HEVCLocalContext *lc)
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{
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    return skip_bytes(&lc->cc, 0) == NULL ? AVERROR_INVALIDDATA : 0;
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}

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static int cabac_init_decoder(HEVCContext *s)
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{
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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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    return 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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}

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int ff_hevc_cabac_init(HEVCContext *s, int ctb_addr_ts)
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{
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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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        int ret = cabac_init_decoder(s);
        if (ret < 0)
            return ret;
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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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            int ret;
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            if (s->threads_number == 1)
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                ret = cabac_reinit(s->HEVClc);
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            else {
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                ret = cabac_init_decoder(s);
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            }
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            if (ret < 0)
                return ret;
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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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                int ret;
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                get_cabac_terminate(&s->HEVClc->cc);
                if (s->threads_number == 1)
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                    ret = cabac_reinit(s->HEVClc);
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                else {
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                    ret = cabac_init_decoder(s);
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                }
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                if (ret < 0)
                    return ret;
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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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    return 0;
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}

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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)
{
620
    int min_cb_width = s->ps.sps->min_cb_width;
621
    int inc = 0;
622 623
    int x0b = av_mod_uintp2(x0, s->ps.sps->log2_ctb_size);
    int y0b = av_mod_uintp2(y0, s->ps.sps->log2_ctb_size);
624

625
    if (s->HEVClc->ctb_left_flag || x0b)
626
        inc = !!SAMPLE_CTB(s->skip_flag, x_cb - 1, y_cb);
627
    if (s->HEVClc->ctb_up_flag || y0b)
628
        inc += !!SAMPLE_CTB(s->skip_flag, x_cb, y_cb - 1);
629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644

    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;
645
        while (k < CABAC_MAX_BIN && get_cabac_bypass(&s->HEVClc->cc)) {
646 647 648 649 650 651 652
            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--)
653
            suffix_val += get_cabac_bypass(&s->HEVClc->cc) << k;
654 655 656 657 658 659
    }
    return prefix_val + suffix_val;
}

int ff_hevc_cu_qp_delta_sign_flag(HEVCContext *s)
{
660
    return get_cabac_bypass(&s->HEVClc->cc);
661 662
}

663 664 665 666 667 668 669
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)
{
670
    int c_max= FFMAX(5, s->ps.pps->chroma_qp_offset_list_len_minus1);
671 672 673 674 675 676 677 678
    int i = 0;

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

    return i;
}

679 680 681 682 683 684 685 686
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;
687 688
    int x0b  = av_mod_uintp2(x0, s->ps.sps->log2_ctb_size);
    int y0b  = av_mod_uintp2(y0, s->ps.sps->log2_ctb_size);
689 690
    int x_cb = x0 >> s->ps.sps->log2_min_cb_size;
    int y_cb = y0 >> s->ps.sps->log2_min_cb_size;
691

692
    if (s->HEVClc->ctb_left_flag || x0b)
693
        depth_left = s->tab_ct_depth[(y_cb) * s->ps.sps->min_cb_width + x_cb - 1];
694
    if (s->HEVClc->ctb_up_flag || y0b)
695
        depth_top = s->tab_ct_depth[(y_cb - 1) * s->ps.sps->min_cb_width + x_cb];
696 697

    inc += (depth_left > ct_depth);
698 699
    inc += (depth_top  > ct_depth);

700 701 702 703 704 705 706
    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;
707
    if (log2_cb_size == s->ps.sps->log2_min_cb_size) {
708
        if (s->HEVClc->cu.pred_mode == MODE_INTRA) // 0
709 710 711 712 713 714 715 716 717 718
            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
    }

719
    if (!s->ps.sps->amp_enabled_flag) {
720 721 722 723 724 725 726 727
        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;
728
        if (get_cabac_bypass(&s->HEVClc->cc)) // 0101
729 730 731 732 733 734
            return PART_2NxnD;
        return PART_2NxnU; // 0100
    }

    if (GET_CABAC(elem_offset[PART_MODE] + 3)) // 001
        return PART_Nx2N;
735
    if (get_cabac_bypass(&s->HEVClc->cc)) // 0001
736
        return PART_nRx2N;
737
    return PART_nLx2N;  // 0000
738 739 740 741
}

int ff_hevc_pcm_flag_decode(HEVCContext *s)
{
742
    return get_cabac_terminate(&s->HEVClc->cc);
743 744 745 746 747 748 749 750 751 752
}

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;
753
    while (i < 2 && get_cabac_bypass(&s->HEVClc->cc))
754 755 756 757 758 759 760
        i++;
    return i;
}

int ff_hevc_rem_intra_luma_pred_mode_decode(HEVCContext *s)
{
    int i;
761
    int value = get_cabac_bypass(&s->HEVClc->cc);
762 763

    for (i = 0; i < 4; i++)
764
        value = (value << 1) | get_cabac_bypass(&s->HEVClc->cc);
765 766 767 768 769 770 771 772 773
    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;

774
    ret  = get_cabac_bypass(&s->HEVClc->cc) << 1;
775
    ret |= get_cabac_bypass(&s->HEVClc->cc);
776 777 778 779 780 781 782 783
    return ret;
}

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

    if (i != 0) {
784
        while (i < s->sh.max_num_merge_cand-1 && get_cabac_bypass(&s->HEVClc->cc))
785 786 787 788 789 790 791 792 793 794 795 796 797 798
            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);
799
    if (GET_CABAC(elem_offset[INTER_PRED_IDC] + s->HEVClc->ct_depth))
800 801 802 803 804 805 806 807 808 809 810 811 812 813
        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) {
814
        while (i < max && get_cabac_bypass(&s->HEVClc->cc))
815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830
            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]);
}

831
static av_always_inline int abs_mvd_greater0_flag_decode(HEVCContext *s)
832 833 834 835
{
    return GET_CABAC(elem_offset[ABS_MVD_GREATER0_FLAG]);
}

836
static av_always_inline int abs_mvd_greater1_flag_decode(HEVCContext *s)
837 838 839 840
{
    return GET_CABAC(elem_offset[ABS_MVD_GREATER1_FLAG] + 1);
}

841
static av_always_inline int mvd_decode(HEVCContext *s)
842 843 844 845
{
    int ret = 2;
    int k = 1;

846
    while (k < CABAC_MAX_BIN && get_cabac_bypass(&s->HEVClc->cc)) {
847
        ret += 1U << k;
848 849
        k++;
    }
850
    if (k == CABAC_MAX_BIN) {
851
        av_log(s->avctx, AV_LOG_ERROR, "CABAC_MAX_BIN : %d\n", k);
852 853
        return 0;
    }
854
    while (k--)
855 856
        ret += get_cabac_bypass(&s->HEVClc->cc) << k;
    return get_cabac_bypass_sign(&s->HEVClc->cc, -ret);
857 858
}

859
static av_always_inline int mvd_sign_flag_decode(HEVCContext *s)
860
{
861
    return get_cabac_bypass_sign(&s->HEVClc->cc, -1);
862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878
}

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);
}

879
static int hevc_transform_skip_flag_decode(HEVCContext *s, int c_idx)
880 881 882 883
{
    return GET_CABAC(elem_offset[TRANSFORM_SKIP_FLAG] + !!c_idx);
}

884 885 886 887
static int explicit_rdpcm_flag_decode(HEVCContext *s, int c_idx)
{
    return GET_CABAC(elem_offset[EXPLICIT_RDPCM_FLAG] + !!c_idx);
}
888

889
static int explicit_rdpcm_dir_flag_decode(HEVCContext *s, int c_idx)
890
{
891 892 893 894 895 896 897 898 899 900
    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;
901 902
}

903 904 905 906 907 908
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)
909
{
910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930
    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;
931 932
}

933
static av_always_inline int last_significant_coeff_suffix_decode(HEVCContext *s,
934 935 936 937
                                                 int last_significant_coeff_prefix)
{
    int i;
    int length = (last_significant_coeff_prefix >> 1) - 1;
938
    int value = get_cabac_bypass(&s->HEVClc->cc);
939 940

    for (i = 1; i < length; i++)
941
        value = (value << 1) | get_cabac_bypass(&s->HEVClc->cc);
942 943 944
    return value;
}

945
static av_always_inline int significant_coeff_group_flag_decode(HEVCContext *s, int c_idx, int ctx_cg)
946 947 948 949 950 951 952
{
    int inc;

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

    return GET_CABAC(elem_offset[SIGNIFICANT_COEFF_GROUP_FLAG] + inc);
}
953 954
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)
955
{
956
    int inc = ctx_idx_map[(y_c << 2) + x_c] + offset;
957 958 959
    return GET_CABAC(elem_offset[SIGNIFICANT_COEFF_FLAG] + inc);
}

960 961 962 963 964
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);
}

965
static av_always_inline int coeff_abs_level_greater1_flag_decode(HEVCContext *s, int c_idx, int inc)
966 967 968 969 970
{

    if (c_idx > 0)
        inc += 16;

971
    return GET_CABAC(elem_offset[COEFF_ABS_LEVEL_GREATER1_FLAG] + inc);
972 973
}

974
static av_always_inline int coeff_abs_level_greater2_flag_decode(HEVCContext *s, int c_idx, int inc)
975 976 977 978 979 980 981
{
    if (c_idx > 0)
        inc += 4;

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

982
static av_always_inline int coeff_abs_level_remaining_decode(HEVCContext *s, int rc_rice_param)
983 984 985
{
    int prefix = 0;
    int suffix = 0;
986 987
    int last_coeff_abs_level_remaining;
    int i;
988

989
    while (prefix < CABAC_MAX_BIN && get_cabac_bypass(&s->HEVClc->cc))
990
        prefix++;
991
    if (prefix == CABAC_MAX_BIN) {
992
        av_log(s->avctx, AV_LOG_ERROR, "CABAC_MAX_BIN : %d\n", prefix);
993 994
        return 0;
    }
995
    if (prefix < 3) {
996
        for (i = 0; i < rc_rice_param; i++)
997
            suffix = (suffix << 1) | get_cabac_bypass(&s->HEVClc->cc);
998
        last_coeff_abs_level_remaining = (prefix << rc_rice_param) + suffix;
999
    } else {
1000 1001
        int prefix_minus3 = prefix - 3;
        for (i = 0; i < prefix_minus3 + rc_rice_param; i++)
1002
            suffix = (suffix << 1) | get_cabac_bypass(&s->HEVClc->cc);
1003 1004
        last_coeff_abs_level_remaining = (((1 << prefix_minus3) + 3 - 1)
                                              << rc_rice_param) + suffix;
1005
    }
1006
    return last_coeff_abs_level_remaining;
1007 1008
}

1009
static av_always_inline int coeff_sign_flag_decode(HEVCContext *s, uint8_t nb)
1010 1011 1012 1013 1014
{
    int i;
    int ret = 0;

    for (i = 0; i < nb; i++)
1015
        ret = (ret << 1) | get_cabac_bypass(&s->HEVClc->cc);
1016 1017
    return ret;
}
1018 1019 1020 1021 1022 1023 1024

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 {                                                        \
1025 1026
        x_c = (x_cg << 2) + scan_x_off[n];                      \
        y_c = (y_cg << 2) + scan_y_off[n];                      \
1027
    } while (0)
1028
    HEVCLocalContext *lc = s->HEVClc;
1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042
    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];
1043 1044
    int hshift = s->ps.sps->hshift[c_idx];
    int vshift = s->ps.sps->vshift[c_idx];
1045
    uint8_t *dst = &s->frame->data[c_idx][(y0 >> vshift) * stride +
1046
                                          ((x0 >> hshift) << s->ps.sps->pixel_shift)];
1047
    int16_t *coeffs = (int16_t*)(c_idx ? lc->edge_emu_buffer2 : lc->edge_emu_buffer);
1048 1049 1050
    uint8_t significant_coeff_group_flag[8][8] = {{0}};
    int explicit_rdpcm_flag = 0;
    int explicit_rdpcm_dir_flag;
1051 1052 1053 1054

    int trafo_size = 1 << log2_trafo_size;
    int i;
    int qp,shift,add,scale,scale_m;
1055
    static const uint8_t level_scale[] = { 40, 45, 51, 57, 64, 72 };
1056
    const uint8_t *scale_matrix = NULL;
1057
    uint8_t dc_scale;
1058 1059 1060 1061
    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));
1062 1063 1064 1065

    // 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 };
1066
        static const uint8_t rem6[51 + 4 * 6 + 1] = {
1067 1068 1069
            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,
1070
            4, 5, 0, 1, 2, 3, 4, 5, 0, 1
1071 1072
        };

1073
        static const uint8_t div6[51 + 4 * 6 + 1] = {
1074 1075 1076
            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,
1077
            10, 10, 11, 11, 11, 11, 11, 11, 12, 12
1078 1079 1080
        };
        int qp_y = lc->qp_y;

1081 1082
        if (s->ps.pps->transform_skip_enabled_flag &&
            log2_trafo_size <= s->ps.pps->log2_max_transform_skip_block_size) {
1083
            transform_skip_flag = hevc_transform_skip_flag_decode(s, c_idx);
1084 1085
        }

1086
        if (c_idx == 0) {
1087
            qp = qp_y + s->ps.sps->qp_bd_offset;
1088 1089 1090 1091
        } else {
            int qp_i, offset;

            if (c_idx == 1)
1092
                offset = s->ps.pps->cb_qp_offset + s->sh.slice_cb_qp_offset +
1093
                         lc->tu.cu_qp_offset_cb;
1094
            else
1095
                offset = s->ps.pps->cr_qp_offset + s->sh.slice_cr_qp_offset +
1096
                         lc->tu.cu_qp_offset_cr;
1097

1098 1099
            qp_i = av_clip(qp_y + offset, - s->ps.sps->qp_bd_offset, 57);
            if (s->ps.sps->chroma_format_idc == 1) {
1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111
                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;
            }
1112

1113
            qp += s->ps.sps->qp_bd_offset;
1114 1115
        }

1116
        shift    = s->ps.sps->bit_depth + log2_trafo_size - 5;
1117 1118 1119 1120 1121
        add      = 1 << (shift-1);
        scale    = level_scale[rem6[qp]] << (div6[qp]);
        scale_m  = 16; // default when no custom scaling lists.
        dc_scale = 16;

1122 1123 1124
        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;
1125 1126
            int matrix_id = lc->cu.pred_mode != MODE_INTRA;

1127
            matrix_id = 3 * matrix_id + c_idx;
1128 1129 1130 1131 1132

            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];
        }
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    } else {
        shift        = 0;
        add          = 0;
        scale        = 0;
        dc_scale     = 0;
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    }

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    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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    }
}