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/*
 * HEVC video decoder
 *
 * Copyright (C) 2012 - 2013 Guillaume Martres
 * Copyright (C) 2012 - 2013 Mickael Raulet
 * Copyright (C) 2012 - 2013 Gildas Cocherel
 * Copyright (C) 2012 - 2013 Wassim Hamidouche
 *
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; 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 "libavutil/internal.h"
#include "libavutil/md5.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
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#include "libavutil/stereo3d.h"
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#include "bswapdsp.h"
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#include "bytestream.h"
#include "cabac_functions.h"
#include "golomb.h"
#include "hevc.h"

const uint8_t ff_hevc_qpel_extra_before[4] = { 0, 3, 3, 2 };
const uint8_t ff_hevc_qpel_extra_after[4]  = { 0, 3, 4, 4 };
const uint8_t ff_hevc_qpel_extra[4]        = { 0, 6, 7, 6 };

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, },
};

const uint8_t ff_hevc_diag_scan4x4_x[16] = {
    0, 0, 1, 0,
    1, 2, 0, 1,
    2, 3, 1, 2,
    3, 2, 3, 3,
};

const uint8_t ff_hevc_diag_scan4x4_y[16] = {
    0, 1, 0, 2,
    1, 0, 3, 2,
    1, 0, 3, 2,
    1, 3, 2, 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, },
};

const uint8_t ff_hevc_diag_scan8x8_x[64] = {
    0, 0, 1, 0,
    1, 2, 0, 1,
    2, 3, 0, 1,
    2, 3, 4, 0,
    1, 2, 3, 4,
    5, 0, 1, 2,
    3, 4, 5, 6,
    0, 1, 2, 3,
    4, 5, 6, 7,
    1, 2, 3, 4,
    5, 6, 7, 2,
    3, 4, 5, 6,
    7, 3, 4, 5,
    6, 7, 4, 5,
    6, 7, 5, 6,
    7, 6, 7, 7,
};

const uint8_t ff_hevc_diag_scan8x8_y[64] = {
    0, 1, 0, 2,
    1, 0, 3, 2,
    1, 0, 4, 3,
    2, 1, 0, 5,
    4, 3, 2, 1,
    0, 6, 5, 4,
    3, 2, 1, 0,
    7, 6, 5, 4,
    3, 2, 1, 0,
    7, 6, 5, 4,
    3, 2, 1, 7,
    6, 5, 4, 3,
    2, 7, 6, 5,
    4, 3, 7, 6,
    5, 4, 7, 6,
    5, 7, 6, 7,
};

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, },
};

/**
 * NOTE: Each function hls_foo correspond to the function foo in the
 * specification (HLS stands for High Level Syntax).
 */

/**
 * Section 5.7
 */

/* free everything allocated  by pic_arrays_init() */
static void pic_arrays_free(HEVCContext *s)
{
    av_freep(&s->sao);
    av_freep(&s->deblock);
    av_freep(&s->split_cu_flag);

    av_freep(&s->skip_flag);
    av_freep(&s->tab_ct_depth);

    av_freep(&s->tab_ipm);
    av_freep(&s->cbf_luma);
    av_freep(&s->is_pcm);

    av_freep(&s->qp_y_tab);
    av_freep(&s->tab_slice_address);
    av_freep(&s->filter_slice_edges);

    av_freep(&s->horizontal_bs);
    av_freep(&s->vertical_bs);

    av_buffer_pool_uninit(&s->tab_mvf_pool);
    av_buffer_pool_uninit(&s->rpl_tab_pool);
}

/* allocate arrays that depend on frame dimensions */
static int pic_arrays_init(HEVCContext *s, const HEVCSPS *sps)
{
    int log2_min_cb_size = sps->log2_min_cb_size;
    int width            = sps->width;
    int height           = sps->height;
    int pic_size         = width * height;
    int pic_size_in_ctb  = ((width  >> log2_min_cb_size) + 1) *
                           ((height >> log2_min_cb_size) + 1);
    int ctb_count        = sps->ctb_width * sps->ctb_height;
    int min_pu_size      = sps->min_pu_width * sps->min_pu_height;

    s->bs_width  = width  >> 3;
    s->bs_height = height >> 3;

    s->sao           = av_mallocz_array(ctb_count, sizeof(*s->sao));
    s->deblock       = av_mallocz_array(ctb_count, sizeof(*s->deblock));
    s->split_cu_flag = av_malloc(pic_size);
    if (!s->sao || !s->deblock || !s->split_cu_flag)
        goto fail;

    s->skip_flag    = av_malloc(pic_size_in_ctb);
    s->tab_ct_depth = av_malloc(sps->min_cb_height * sps->min_cb_width);
    if (!s->skip_flag || !s->tab_ct_depth)
        goto fail;

    s->cbf_luma = av_malloc(sps->min_tb_width * sps->min_tb_height);
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    s->tab_ipm  = av_mallocz(min_pu_size);
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    s->is_pcm   = av_malloc(min_pu_size);
    if (!s->tab_ipm || !s->cbf_luma || !s->is_pcm)
        goto fail;

    s->filter_slice_edges = av_malloc(ctb_count);
    s->tab_slice_address  = av_malloc(pic_size_in_ctb *
                                      sizeof(*s->tab_slice_address));
    s->qp_y_tab           = av_malloc(pic_size_in_ctb *
                                      sizeof(*s->qp_y_tab));
    if (!s->qp_y_tab || !s->filter_slice_edges || !s->tab_slice_address)
        goto fail;

    s->horizontal_bs = av_mallocz(2 * s->bs_width * (s->bs_height + 1));
    s->vertical_bs   = av_mallocz(2 * s->bs_width * (s->bs_height + 1));
    if (!s->horizontal_bs || !s->vertical_bs)
        goto fail;

    s->tab_mvf_pool = av_buffer_pool_init(min_pu_size * sizeof(MvField),
                                          av_buffer_alloc);
    s->rpl_tab_pool = av_buffer_pool_init(ctb_count * sizeof(RefPicListTab),
                                          av_buffer_allocz);
    if (!s->tab_mvf_pool || !s->rpl_tab_pool)
        goto fail;

    return 0;

fail:
    pic_arrays_free(s);
    return AVERROR(ENOMEM);
}

static void pred_weight_table(HEVCContext *s, GetBitContext *gb)
{
    int i = 0;
    int j = 0;
    uint8_t luma_weight_l0_flag[16];
    uint8_t chroma_weight_l0_flag[16];
    uint8_t luma_weight_l1_flag[16];
    uint8_t chroma_weight_l1_flag[16];

    s->sh.luma_log2_weight_denom = get_ue_golomb_long(gb);
    if (s->sps->chroma_format_idc != 0) {
        int delta = get_se_golomb(gb);
        s->sh.chroma_log2_weight_denom = av_clip_c(s->sh.luma_log2_weight_denom + delta, 0, 7);
    }

    for (i = 0; i < s->sh.nb_refs[L0]; i++) {
        luma_weight_l0_flag[i] = get_bits1(gb);
        if (!luma_weight_l0_flag[i]) {
            s->sh.luma_weight_l0[i] = 1 << s->sh.luma_log2_weight_denom;
            s->sh.luma_offset_l0[i] = 0;
        }
    }
    if (s->sps->chroma_format_idc != 0) { // FIXME: invert "if" and "for"
        for (i = 0; i < s->sh.nb_refs[L0]; i++)
            chroma_weight_l0_flag[i] = get_bits1(gb);
    } else {
        for (i = 0; i < s->sh.nb_refs[L0]; i++)
            chroma_weight_l0_flag[i] = 0;
    }
    for (i = 0; i < s->sh.nb_refs[L0]; i++) {
        if (luma_weight_l0_flag[i]) {
            int delta_luma_weight_l0 = get_se_golomb(gb);
            s->sh.luma_weight_l0[i] = (1 << s->sh.luma_log2_weight_denom) + delta_luma_weight_l0;
            s->sh.luma_offset_l0[i] = get_se_golomb(gb);
        }
        if (chroma_weight_l0_flag[i]) {
            for (j = 0; j < 2; j++) {
                int delta_chroma_weight_l0 = get_se_golomb(gb);
                int delta_chroma_offset_l0 = get_se_golomb(gb);
                s->sh.chroma_weight_l0[i][j] = (1 << s->sh.chroma_log2_weight_denom) + delta_chroma_weight_l0;
                s->sh.chroma_offset_l0[i][j] = av_clip_c((delta_chroma_offset_l0 - ((128 * s->sh.chroma_weight_l0[i][j])
                                                                                    >> s->sh.chroma_log2_weight_denom) + 128), -128, 127);
            }
        } else {
            s->sh.chroma_weight_l0[i][0] = 1 << s->sh.chroma_log2_weight_denom;
            s->sh.chroma_offset_l0[i][0] = 0;
            s->sh.chroma_weight_l0[i][1] = 1 << s->sh.chroma_log2_weight_denom;
            s->sh.chroma_offset_l0[i][1] = 0;
        }
    }
    if (s->sh.slice_type == B_SLICE) {
        for (i = 0; i < s->sh.nb_refs[L1]; i++) {
            luma_weight_l1_flag[i] = get_bits1(gb);
            if (!luma_weight_l1_flag[i]) {
                s->sh.luma_weight_l1[i] = 1 << s->sh.luma_log2_weight_denom;
                s->sh.luma_offset_l1[i] = 0;
            }
        }
        if (s->sps->chroma_format_idc != 0) {
            for (i = 0; i < s->sh.nb_refs[L1]; i++)
                chroma_weight_l1_flag[i] = get_bits1(gb);
        } else {
            for (i = 0; i < s->sh.nb_refs[L1]; i++)
                chroma_weight_l1_flag[i] = 0;
        }
        for (i = 0; i < s->sh.nb_refs[L1]; i++) {
            if (luma_weight_l1_flag[i]) {
                int delta_luma_weight_l1 = get_se_golomb(gb);
                s->sh.luma_weight_l1[i] = (1 << s->sh.luma_log2_weight_denom) + delta_luma_weight_l1;
                s->sh.luma_offset_l1[i] = get_se_golomb(gb);
            }
            if (chroma_weight_l1_flag[i]) {
                for (j = 0; j < 2; j++) {
                    int delta_chroma_weight_l1 = get_se_golomb(gb);
                    int delta_chroma_offset_l1 = get_se_golomb(gb);
                    s->sh.chroma_weight_l1[i][j] = (1 << s->sh.chroma_log2_weight_denom) + delta_chroma_weight_l1;
                    s->sh.chroma_offset_l1[i][j] = av_clip_c((delta_chroma_offset_l1 - ((128 * s->sh.chroma_weight_l1[i][j])
                                                                                        >> s->sh.chroma_log2_weight_denom) + 128), -128, 127);
                }
            } else {
                s->sh.chroma_weight_l1[i][0] = 1 << s->sh.chroma_log2_weight_denom;
                s->sh.chroma_offset_l1[i][0] = 0;
                s->sh.chroma_weight_l1[i][1] = 1 << s->sh.chroma_log2_weight_denom;
                s->sh.chroma_offset_l1[i][1] = 0;
            }
        }
    }
}

static int decode_lt_rps(HEVCContext *s, LongTermRPS *rps, GetBitContext *gb)
{
    const HEVCSPS *sps = s->sps;
    int max_poc_lsb    = 1 << sps->log2_max_poc_lsb;
    int prev_delta_msb = 0;
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    unsigned int nb_sps = 0, nb_sh;
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    int i;

    rps->nb_refs = 0;
    if (!sps->long_term_ref_pics_present_flag)
        return 0;

    if (sps->num_long_term_ref_pics_sps > 0)
        nb_sps = get_ue_golomb_long(gb);
    nb_sh = get_ue_golomb_long(gb);

    if (nb_sh + nb_sps > FF_ARRAY_ELEMS(rps->poc))
        return AVERROR_INVALIDDATA;

    rps->nb_refs = nb_sh + nb_sps;

    for (i = 0; i < rps->nb_refs; i++) {
        uint8_t delta_poc_msb_present;

        if (i < nb_sps) {
            uint8_t lt_idx_sps = 0;

            if (sps->num_long_term_ref_pics_sps > 1)
                lt_idx_sps = get_bits(gb, av_ceil_log2(sps->num_long_term_ref_pics_sps));

            rps->poc[i]  = sps->lt_ref_pic_poc_lsb_sps[lt_idx_sps];
            rps->used[i] = sps->used_by_curr_pic_lt_sps_flag[lt_idx_sps];
        } else {
            rps->poc[i]  = get_bits(gb, sps->log2_max_poc_lsb);
            rps->used[i] = get_bits1(gb);
        }

        delta_poc_msb_present = get_bits1(gb);
        if (delta_poc_msb_present) {
            int delta = get_ue_golomb_long(gb);

            if (i && i != nb_sps)
                delta += prev_delta_msb;

            rps->poc[i] += s->poc - delta * max_poc_lsb - s->sh.pic_order_cnt_lsb;
            prev_delta_msb = delta;
        }
    }

    return 0;
}

static int set_sps(HEVCContext *s, const HEVCSPS *sps)
{
    int ret;
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    unsigned int num = 0, den = 0;
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    pic_arrays_free(s);
    ret = pic_arrays_init(s, sps);
    if (ret < 0)
        goto fail;

    s->avctx->coded_width         = sps->width;
    s->avctx->coded_height        = sps->height;
    s->avctx->width               = sps->output_width;
    s->avctx->height              = sps->output_height;
    s->avctx->pix_fmt             = sps->pix_fmt;
    s->avctx->has_b_frames        = sps->temporal_layer[sps->max_sub_layers - 1].num_reorder_pics;

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    ff_set_sar(s->avctx, sps->vui.sar);

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    if (sps->vui.video_signal_type_present_flag)
        s->avctx->color_range = sps->vui.video_full_range_flag ? AVCOL_RANGE_JPEG
                                                               : AVCOL_RANGE_MPEG;
    else
        s->avctx->color_range = AVCOL_RANGE_MPEG;

    if (sps->vui.colour_description_present_flag) {
        s->avctx->color_primaries = sps->vui.colour_primaries;
        s->avctx->color_trc       = sps->vui.transfer_characteristic;
        s->avctx->colorspace      = sps->vui.matrix_coeffs;
    } else {
        s->avctx->color_primaries = AVCOL_PRI_UNSPECIFIED;
        s->avctx->color_trc       = AVCOL_TRC_UNSPECIFIED;
        s->avctx->colorspace      = AVCOL_SPC_UNSPECIFIED;
    }

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    ff_hevc_pred_init(&s->hpc,     sps->bit_depth);
    ff_hevc_dsp_init (&s->hevcdsp, sps->bit_depth);
    ff_videodsp_init (&s->vdsp,    sps->bit_depth);

    if (sps->sao_enabled) {
        av_frame_unref(s->tmp_frame);
        ret = ff_get_buffer(s->avctx, s->tmp_frame, AV_GET_BUFFER_FLAG_REF);
        if (ret < 0)
            goto fail;
        s->frame = s->tmp_frame;
    }

    s->sps = sps;
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    s->vps = (HEVCVPS*) s->vps_list[s->sps->vps_id]->data;
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    if (s->vps->vps_timing_info_present_flag) {
        num = s->vps->vps_num_units_in_tick;
        den = s->vps->vps_time_scale;
    } else if (sps->vui.vui_timing_info_present_flag) {
        num = sps->vui.vui_num_units_in_tick;
        den = sps->vui.vui_time_scale;
    }

    if (num != 0 && den != 0)
        av_reduce(&s->avctx->time_base.num, &s->avctx->time_base.den,
                  num, den, 1 << 30);

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    return 0;

fail:
    pic_arrays_free(s);
    s->sps = NULL;
    return ret;
}

static int hls_slice_header(HEVCContext *s)
{
    GetBitContext *gb = &s->HEVClc.gb;
    SliceHeader *sh   = &s->sh;
    int i, ret;

    // Coded parameters
    sh->first_slice_in_pic_flag = get_bits1(gb);
    if ((IS_IDR(s) || IS_BLA(s)) && sh->first_slice_in_pic_flag) {
        s->seq_decode = (s->seq_decode + 1) & 0xff;
        s->max_ra     = INT_MAX;
        if (IS_IDR(s))
            ff_hevc_clear_refs(s);
    }
    if (s->nal_unit_type >= 16 && s->nal_unit_type <= 23)
        sh->no_output_of_prior_pics_flag = get_bits1(gb);

    sh->pps_id = get_ue_golomb_long(gb);
    if (sh->pps_id >= MAX_PPS_COUNT || !s->pps_list[sh->pps_id]) {
        av_log(s->avctx, AV_LOG_ERROR, "PPS id out of range: %d\n", sh->pps_id);
        return AVERROR_INVALIDDATA;
    }
    if (!sh->first_slice_in_pic_flag &&
        s->pps != (HEVCPPS*)s->pps_list[sh->pps_id]->data) {
        av_log(s->avctx, AV_LOG_ERROR, "PPS changed between slices.\n");
        return AVERROR_INVALIDDATA;
    }
    s->pps = (HEVCPPS*)s->pps_list[sh->pps_id]->data;

    if (s->sps != (HEVCSPS*)s->sps_list[s->pps->sps_id]->data) {
        s->sps = (HEVCSPS*)s->sps_list[s->pps->sps_id]->data;

        ff_hevc_clear_refs(s);
        ret = set_sps(s, s->sps);
        if (ret < 0)
            return ret;

        s->seq_decode = (s->seq_decode + 1) & 0xff;
        s->max_ra     = INT_MAX;
    }

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    s->avctx->profile = s->sps->ptl.general_ptl.profile_idc;
    s->avctx->level   = s->sps->ptl.general_ptl.level_idc;

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    sh->dependent_slice_segment_flag = 0;
    if (!sh->first_slice_in_pic_flag) {
        int slice_address_length;

        if (s->pps->dependent_slice_segments_enabled_flag)
            sh->dependent_slice_segment_flag = get_bits1(gb);

        slice_address_length = av_ceil_log2(s->sps->ctb_width *
                                            s->sps->ctb_height);
        sh->slice_segment_addr = get_bits(gb, slice_address_length);
        if (sh->slice_segment_addr >= s->sps->ctb_width * s->sps->ctb_height) {
            av_log(s->avctx, AV_LOG_ERROR,
                   "Invalid slice segment address: %u.\n",
                   sh->slice_segment_addr);
            return AVERROR_INVALIDDATA;
        }

        if (!sh->dependent_slice_segment_flag) {
            sh->slice_addr = sh->slice_segment_addr;
            s->slice_idx++;
        }
    } else {
        sh->slice_segment_addr = sh->slice_addr = 0;
        s->slice_idx           = 0;
        s->slice_initialized   = 0;
    }

    if (!sh->dependent_slice_segment_flag) {
        s->slice_initialized = 0;

        for (i = 0; i < s->pps->num_extra_slice_header_bits; i++)
            skip_bits(gb, 1);  // slice_reserved_undetermined_flag[]

        sh->slice_type = get_ue_golomb_long(gb);
        if (!(sh->slice_type == I_SLICE ||
              sh->slice_type == P_SLICE ||
              sh->slice_type == B_SLICE)) {
            av_log(s->avctx, AV_LOG_ERROR, "Unknown slice type: %d.\n",
                   sh->slice_type);
            return AVERROR_INVALIDDATA;
        }
        if (IS_IRAP(s) && sh->slice_type != I_SLICE) {
            av_log(s->avctx, AV_LOG_ERROR, "Inter slices in an IRAP frame.\n");
            return AVERROR_INVALIDDATA;
        }

        if (s->pps->output_flag_present_flag)
            sh->pic_output_flag = get_bits1(gb);

        if (s->sps->separate_colour_plane_flag)
            sh->colour_plane_id = get_bits(gb, 2);

        if (!IS_IDR(s)) {
            int short_term_ref_pic_set_sps_flag, poc;

            sh->pic_order_cnt_lsb = get_bits(gb, s->sps->log2_max_poc_lsb);
            poc = ff_hevc_compute_poc(s, sh->pic_order_cnt_lsb);
            if (!sh->first_slice_in_pic_flag && poc != s->poc) {
                av_log(s->avctx, AV_LOG_WARNING,
                       "Ignoring POC change between slices: %d -> %d\n", s->poc, poc);
                if (s->avctx->err_recognition & AV_EF_EXPLODE)
                    return AVERROR_INVALIDDATA;
                poc = s->poc;
            }
            s->poc = poc;

            short_term_ref_pic_set_sps_flag = get_bits1(gb);
            if (!short_term_ref_pic_set_sps_flag) {
                ret = ff_hevc_decode_short_term_rps(s, &sh->slice_rps, s->sps, 1);
                if (ret < 0)
                    return ret;

                sh->short_term_rps = &sh->slice_rps;
            } else {
                int numbits, rps_idx;

                if (!s->sps->nb_st_rps) {
                    av_log(s->avctx, AV_LOG_ERROR, "No ref lists in the SPS.\n");
                    return AVERROR_INVALIDDATA;
                }

                numbits = av_ceil_log2(s->sps->nb_st_rps);
                rps_idx = numbits > 0 ? get_bits(gb, numbits) : 0;
                sh->short_term_rps = &s->sps->st_rps[rps_idx];
            }

            ret = decode_lt_rps(s, &sh->long_term_rps, gb);
            if (ret < 0) {
                av_log(s->avctx, AV_LOG_WARNING, "Invalid long term RPS.\n");
                if (s->avctx->err_recognition & AV_EF_EXPLODE)
                    return AVERROR_INVALIDDATA;
            }

            if (s->sps->sps_temporal_mvp_enabled_flag)
                sh->slice_temporal_mvp_enabled_flag = get_bits1(gb);
            else
                sh->slice_temporal_mvp_enabled_flag = 0;
        } else {
            s->sh.short_term_rps = NULL;
            s->poc               = 0;
        }

        /* 8.3.1 */
        if (s->temporal_id == 0 &&
            s->nal_unit_type != NAL_TRAIL_N &&
            s->nal_unit_type != NAL_TSA_N   &&
            s->nal_unit_type != NAL_STSA_N  &&
            s->nal_unit_type != NAL_RADL_N  &&
            s->nal_unit_type != NAL_RADL_R  &&
            s->nal_unit_type != NAL_RASL_N  &&
            s->nal_unit_type != NAL_RASL_R)
            s->pocTid0 = s->poc;

        if (s->sps->sao_enabled) {
            sh->slice_sample_adaptive_offset_flag[0] = get_bits1(gb);
            sh->slice_sample_adaptive_offset_flag[1] =
            sh->slice_sample_adaptive_offset_flag[2] = get_bits1(gb);
        } else {
            sh->slice_sample_adaptive_offset_flag[0] = 0;
            sh->slice_sample_adaptive_offset_flag[1] = 0;
            sh->slice_sample_adaptive_offset_flag[2] = 0;
        }

        sh->nb_refs[L0] = sh->nb_refs[L1] = 0;
        if (sh->slice_type == P_SLICE || sh->slice_type == B_SLICE) {
            int nb_refs;

            sh->nb_refs[L0] = s->pps->num_ref_idx_l0_default_active;
            if (sh->slice_type == B_SLICE)
                sh->nb_refs[L1] = s->pps->num_ref_idx_l1_default_active;

            if (get_bits1(gb)) { // num_ref_idx_active_override_flag
                sh->nb_refs[L0] = get_ue_golomb_long(gb) + 1;
                if (sh->slice_type == B_SLICE)
                    sh->nb_refs[L1] = get_ue_golomb_long(gb) + 1;
            }
            if (sh->nb_refs[L0] > MAX_REFS || sh->nb_refs[L1] > MAX_REFS) {
                av_log(s->avctx, AV_LOG_ERROR, "Too many refs: %d/%d.\n",
                       sh->nb_refs[L0], sh->nb_refs[L1]);
                return AVERROR_INVALIDDATA;
            }

            sh->rpl_modification_flag[0] = 0;
            sh->rpl_modification_flag[1] = 0;
            nb_refs = ff_hevc_frame_nb_refs(s);
            if (!nb_refs) {
                av_log(s->avctx, AV_LOG_ERROR, "Zero refs for a frame with P or B slices.\n");
                return AVERROR_INVALIDDATA;
            }

            if (s->pps->lists_modification_present_flag && nb_refs > 1) {
                sh->rpl_modification_flag[0] = get_bits1(gb);
                if (sh->rpl_modification_flag[0]) {
                    for (i = 0; i < sh->nb_refs[L0]; i++)
                        sh->list_entry_lx[0][i] = get_bits(gb, av_ceil_log2(nb_refs));
                }

                if (sh->slice_type == B_SLICE) {
                    sh->rpl_modification_flag[1] = get_bits1(gb);
                    if (sh->rpl_modification_flag[1] == 1)
                        for (i = 0; i < sh->nb_refs[L1]; i++)
                            sh->list_entry_lx[1][i] = get_bits(gb, av_ceil_log2(nb_refs));
                }
            }

            if (sh->slice_type == B_SLICE)
                sh->mvd_l1_zero_flag = get_bits1(gb);

            if (s->pps->cabac_init_present_flag)
                sh->cabac_init_flag = get_bits1(gb);
            else
                sh->cabac_init_flag = 0;

            sh->collocated_ref_idx = 0;
            if (sh->slice_temporal_mvp_enabled_flag) {
                sh->collocated_list = L0;
                if (sh->slice_type == B_SLICE)
                    sh->collocated_list = !get_bits1(gb);

                if (sh->nb_refs[sh->collocated_list] > 1) {
                    sh->collocated_ref_idx = get_ue_golomb_long(gb);
                    if (sh->collocated_ref_idx >= sh->nb_refs[sh->collocated_list]) {
                        av_log(s->avctx, AV_LOG_ERROR,
                               "Invalid collocated_ref_idx: %d.\n",
                               sh->collocated_ref_idx);
                        return AVERROR_INVALIDDATA;
                    }
                }
            }

            if ((s->pps->weighted_pred_flag   && sh->slice_type == P_SLICE) ||
                (s->pps->weighted_bipred_flag && sh->slice_type == B_SLICE)) {
                pred_weight_table(s, gb);
            }

            sh->max_num_merge_cand = 5 - get_ue_golomb_long(gb);
            if (sh->max_num_merge_cand < 1 || sh->max_num_merge_cand > 5) {
                av_log(s->avctx, AV_LOG_ERROR,
                       "Invalid number of merging MVP candidates: %d.\n",
                       sh->max_num_merge_cand);
                return AVERROR_INVALIDDATA;
            }
        }

        sh->slice_qp_delta = get_se_golomb(gb);
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        if (s->pps->pic_slice_level_chroma_qp_offsets_present_flag) {
            sh->slice_cb_qp_offset = get_se_golomb(gb);
            sh->slice_cr_qp_offset = get_se_golomb(gb);
        } else {
            sh->slice_cb_qp_offset = 0;
            sh->slice_cr_qp_offset = 0;
        }

        if (s->pps->deblocking_filter_control_present_flag) {
            int deblocking_filter_override_flag = 0;

            if (s->pps->deblocking_filter_override_enabled_flag)
                deblocking_filter_override_flag = get_bits1(gb);

            if (deblocking_filter_override_flag) {
                sh->disable_deblocking_filter_flag = get_bits1(gb);
                if (!sh->disable_deblocking_filter_flag) {
                    sh->beta_offset = get_se_golomb(gb) * 2;
                    sh->tc_offset   = get_se_golomb(gb) * 2;
                }
            } else {
                sh->disable_deblocking_filter_flag = s->pps->disable_dbf;
                sh->beta_offset                    = s->pps->beta_offset;
                sh->tc_offset                      = s->pps->tc_offset;
            }
        } else {
            sh->disable_deblocking_filter_flag = 0;
            sh->beta_offset                    = 0;
            sh->tc_offset                      = 0;
        }

        if (s->pps->seq_loop_filter_across_slices_enabled_flag &&
            (sh->slice_sample_adaptive_offset_flag[0] ||
             sh->slice_sample_adaptive_offset_flag[1] ||
             !sh->disable_deblocking_filter_flag)) {
            sh->slice_loop_filter_across_slices_enabled_flag = get_bits1(gb);
        } else {
            sh->slice_loop_filter_across_slices_enabled_flag = s->pps->seq_loop_filter_across_slices_enabled_flag;
        }
    } else if (!s->slice_initialized) {
        av_log(s->avctx, AV_LOG_ERROR, "Independent slice segment missing.\n");
        return AVERROR_INVALIDDATA;
    }

    sh->num_entry_point_offsets = 0;
    if (s->pps->tiles_enabled_flag || s->pps->entropy_coding_sync_enabled_flag) {
        sh->num_entry_point_offsets = get_ue_golomb_long(gb);
        if (sh->num_entry_point_offsets > 0) {
            int offset_len = get_ue_golomb_long(gb) + 1;

            for (i = 0; i < sh->num_entry_point_offsets; i++)
                skip_bits(gb, offset_len);
        }
    }

    if (s->pps->slice_header_extension_present_flag) {
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        unsigned int length = get_ue_golomb_long(gb);
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        for (i = 0; i < length; i++)
            skip_bits(gb, 8);  // slice_header_extension_data_byte
    }

    // Inferred parameters
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    sh->slice_qp = 26 + s->pps->pic_init_qp_minus26 + sh->slice_qp_delta;
    if (sh->slice_qp > 51 ||
        sh->slice_qp < -s->sps->qp_bd_offset) {
        av_log(s->avctx, AV_LOG_ERROR,
               "The slice_qp %d is outside the valid range "
               "[%d, 51].\n",
               sh->slice_qp,
               -s->sps->qp_bd_offset);
        return AVERROR_INVALIDDATA;
    }

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    sh->slice_ctb_addr_rs = sh->slice_segment_addr;

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    if (!s->sh.slice_ctb_addr_rs && s->sh.dependent_slice_segment_flag) {
        av_log(s->avctx, AV_LOG_ERROR, "Impossible slice segment.\n");
        return AVERROR_INVALIDDATA;
    }

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    s->HEVClc.first_qp_group = !s->sh.dependent_slice_segment_flag;

    if (!s->pps->cu_qp_delta_enabled_flag)
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        s->HEVClc.qp_y = FFUMOD(s->sh.slice_qp + 52 + 2 * s->sps->qp_bd_offset,
                                52 + s->sps->qp_bd_offset) - s->sps->qp_bd_offset;
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    s->slice_initialized = 1;

    return 0;
}

#define CTB(tab, x, y) ((tab)[(y) * s->sps->ctb_width + (x)])

#define SET_SAO(elem, value)                            \
do {                                                    \
    if (!sao_merge_up_flag && !sao_merge_left_flag)     \
        sao->elem = value;                              \
    else if (sao_merge_left_flag)                       \
        sao->elem = CTB(s->sao, rx-1, ry).elem;         \
    else if (sao_merge_up_flag)                         \
        sao->elem = CTB(s->sao, rx, ry-1).elem;         \
    else                                                \
        sao->elem = 0;                                  \
} while (0)

static void hls_sao_param(HEVCContext *s, int rx, int ry)
{
    HEVCLocalContext *lc    = &s->HEVClc;
    int sao_merge_left_flag = 0;
    int sao_merge_up_flag   = 0;
    int shift               = s->sps->bit_depth - FFMIN(s->sps->bit_depth, 10);
    SAOParams *sao          = &CTB(s->sao, rx, ry);
    int c_idx, i;

    if (s->sh.slice_sample_adaptive_offset_flag[0] ||
        s->sh.slice_sample_adaptive_offset_flag[1]) {
        if (rx > 0) {
            if (lc->ctb_left_flag)
                sao_merge_left_flag = ff_hevc_sao_merge_flag_decode(s);
        }
        if (ry > 0 && !sao_merge_left_flag) {
            if (lc->ctb_up_flag)
                sao_merge_up_flag = ff_hevc_sao_merge_flag_decode(s);
        }
    }

    for (c_idx = 0; c_idx < 3; c_idx++) {
        if (!s->sh.slice_sample_adaptive_offset_flag[c_idx]) {
            sao->type_idx[c_idx] = SAO_NOT_APPLIED;
            continue;
        }

        if (c_idx == 2) {
            sao->type_idx[2] = sao->type_idx[1];
            sao->eo_class[2] = sao->eo_class[1];
        } else {
            SET_SAO(type_idx[c_idx], ff_hevc_sao_type_idx_decode(s));
        }

        if (sao->type_idx[c_idx] == SAO_NOT_APPLIED)
            continue;

        for (i = 0; i < 4; i++)
            SET_SAO(offset_abs[c_idx][i], ff_hevc_sao_offset_abs_decode(s));

        if (sao->type_idx[c_idx] == SAO_BAND) {
            for (i = 0; i < 4; i++) {
                if (sao->offset_abs[c_idx][i]) {
                    SET_SAO(offset_sign[c_idx][i],
                            ff_hevc_sao_offset_sign_decode(s));
                } else {
                    sao->offset_sign[c_idx][i] = 0;
                }
            }
            SET_SAO(band_position[c_idx], ff_hevc_sao_band_position_decode(s));
        } else if (c_idx != 2) {
            SET_SAO(eo_class[c_idx], ff_hevc_sao_eo_class_decode(s));
        }

        // Inferred parameters
        sao->offset_val[c_idx][0] = 0;
        for (i = 0; i < 4; i++) {
            sao->offset_val[c_idx][i + 1] = sao->offset_abs[c_idx][i] << shift;
            if (sao->type_idx[c_idx] == SAO_EDGE) {
                if (i > 1)
                    sao->offset_val[c_idx][i + 1] = -sao->offset_val[c_idx][i + 1];
            } else if (sao->offset_sign[c_idx][i]) {
                sao->offset_val[c_idx][i + 1] = -sao->offset_val[c_idx][i + 1];
            }
        }
    }
}

#undef SET_SAO
#undef CTB

static void 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 {                                                        \
        x_c = (scan_x_cg[offset >> 4] << 2) + scan_x_off[n];    \
        y_c = (scan_y_cg[offset >> 4] << 2) + scan_y_off[n];    \
    } while (0)
    HEVCLocalContext *lc    = &s->HEVClc;
    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];
    int hshift       = s->sps->hshift[c_idx];
    int vshift       = s->sps->vshift[c_idx];
    uint8_t *dst     = &s->frame->data[c_idx][(y0 >> vshift) * stride +
                                              ((x0 >> hshift) << s->sps->pixel_shift)];
    DECLARE_ALIGNED(16, int16_t, coeffs[MAX_TB_SIZE * MAX_TB_SIZE]) = { 0 };
    DECLARE_ALIGNED(8, uint8_t, significant_coeff_group_flag[8][8]) = { { 0 } };

    int trafo_size = 1 << log2_trafo_size;
    int i, qp, shift, add, scale, scale_m;
    const uint8_t level_scale[] = { 40, 45, 51, 57, 64, 72 };
    const uint8_t *scale_matrix;
    uint8_t dc_scale;

    // 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
        };

        static const uint8_t rem6[51 + 2 * 6 + 1] = {
            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,
        };

        static const uint8_t div6[51 + 2 * 6 + 1] = {
            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,
        };
        int qp_y = lc->qp_y;

        if (c_idx == 0) {
            qp = qp_y + s->sps->qp_bd_offset;
        } else {
            int qp_i, offset;

            if (c_idx == 1)
                offset = s->pps->cb_qp_offset + s->sh.slice_cb_qp_offset;
            else
                offset = s->pps->cr_qp_offset + s->sh.slice_cr_qp_offset;

            qp_i = av_clip_c(qp_y + offset, -s->sps->qp_bd_offset, 57);
            if (qp_i < 30)
                qp = qp_i;
            else if (qp_i > 43)
                qp = qp_i - 6;
            else
                qp = qp_c[qp_i - 30];

            qp += s->sps->qp_bd_offset;
        }

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

        if (s->sps->scaling_list_enable_flag) {
            const ScalingList *sl = s->pps->scaling_list_data_present_flag ?
                                    &s->pps->scaling_list : &s->sps->scaling_list;
            int matrix_id = lc->cu.pred_mode != MODE_INTRA;

            if (log2_trafo_size != 5)
                matrix_id = 3 * matrix_id + c_idx;

            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];
        }
    }

    if (s->pps->transform_skip_enabled_flag &&
        !lc->cu.cu_transquant_bypass_flag   &&
        log2_trafo_size == 2) {
        transform_skip_flag = ff_hevc_transform_skip_flag_decode(s, c_idx);
    }

    last_significant_coeff_x =
        ff_hevc_last_significant_coeff_x_prefix_decode(s, c_idx, log2_trafo_size);
    last_significant_coeff_y =
        ff_hevc_last_significant_coeff_y_prefix_decode(s, c_idx, log2_trafo_size);

    if (last_significant_coeff_x > 3) {
        int suffix = ff_hevc_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 = ff_hevc_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;
        int implicit_non_zero_coeff = 0;
        int64_t trans_coeff_level;
        int prev_sig = 0;
        int offset   = i << 4;

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

        for (n = n_end; n >= 0; n--) {
            GET_COORD(offset, n);

            if (significant_coeff_group_flag[x_cg][y_cg] &&
                (n > 0 || implicit_non_zero_coeff == 0)) {
                if (ff_hevc_significant_coeff_flag_decode(s, c_idx, x_c, y_c,
                                                          log2_trafo_size,
                                                          scan_idx,
                                                          prev_sig) == 1) {
                    significant_coeff_flag_idx[nb_significant_coeff_flag] = n;
                    nb_significant_coeff_flag++;
                    implicit_non_zero_coeff = 0;
                }
            } else {
                int last_cg = (x_c == (x_cg << 2) && y_c == (y_cg << 2));
                if (last_cg && implicit_non_zero_coeff && significant_coeff_group_flag[x_cg][y_cg]) {
                    significant_coeff_flag_idx[nb_significant_coeff_flag] = n;
                    nb_significant_coeff_flag++;
                }
            }
        }

        n_end = nb_significant_coeff_flag;

        if (n_end) {
            int first_nz_pos_in_cg = 16;
            int last_nz_pos_in_cg = -1;
            int c_rice_param = 0;
            int first_greater1_coeff_idx = -1;
            uint8_t coeff_abs_level_greater1_flag[16] = { 0 };
            uint16_t coeff_sign_flag;
            int sum_abs = 0;
            int sign_hidden = 0;

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

            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 n_idx = significant_coeff_flag_idx[m];
                int inc   = (ctx_set << 2) + greater1_ctx;
                coeff_abs_level_greater1_flag[n_idx] =
                    ff_hevc_coeff_abs_level_greater1_flag_decode(s, c_idx, inc);
                if (coeff_abs_level_greater1_flag[n_idx]) {
                    greater1_ctx = 0;
                } else if (greater1_ctx > 0 && greater1_ctx < 3) {
                    greater1_ctx++;
                }

                if (coeff_abs_level_greater1_flag[n_idx] &&
                    first_greater1_coeff_idx == -1)
                    first_greater1_coeff_idx = n_idx;
            }
            first_nz_pos_in_cg = significant_coeff_flag_idx[n_end - 1];
            sign_hidden        = last_nz_pos_in_cg - first_nz_pos_in_cg >= 4 &&
                                 !lc->cu.cu_transquant_bypass_flag;

            if (first_greater1_coeff_idx != -1) {
                coeff_abs_level_greater1_flag[first_greater1_coeff_idx] += ff_hevc_coeff_abs_level_greater2_flag_decode(s, c_idx, ctx_set);
            }
            if (!s->pps->sign_data_hiding_flag || !sign_hidden) {
                coeff_sign_flag = ff_hevc_coeff_sign_flag(s, nb_significant_coeff_flag) << (16 - nb_significant_coeff_flag);
            } else {
                coeff_sign_flag = ff_hevc_coeff_sign_flag(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);
                trans_coeff_level = 1 + coeff_abs_level_greater1_flag[n];
                if (trans_coeff_level == ((m < 8) ?
                                          ((n == first_greater1_coeff_idx) ? 3 : 2) : 1)) {
                    int last_coeff_abs_level_remaining = ff_hevc_coeff_abs_level_remaining(s, trans_coeff_level, c_rice_param);

                    trans_coeff_level += last_coeff_abs_level_remaining;
                    if ((trans_coeff_level) > (3 * (1 << c_rice_param)))
                        c_rice_param = FFMIN(c_rice_param + 1, 4);
                }
                if (s->pps->sign_data_hiding_flag && sign_hidden) {
                    sum_abs += trans_coeff_level;
                    if (n == first_nz_pos_in_cg && ((sum_abs & 1) == 1))
                        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) {
                    if (s->sps->scaling_list_enable_flag) {
                        if (y_c || x_c || log2_trafo_size < 4) {
                            int pos;
                            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;
                            default: pos = (y_c        << 2) +  x_c;
                            }
                            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;
            }
        }
    }

    if (lc->cu.cu_transquant_bypass_flag) {
        s->hevcdsp.transquant_bypass[log2_trafo_size - 2](dst, coeffs, stride);
    } else {
        if (transform_skip_flag)
            s->hevcdsp.transform_skip(dst, coeffs, stride);
        else if (lc->cu.pred_mode == MODE_INTRA && c_idx == 0 &&
                 log2_trafo_size == 2)
            s->hevcdsp.transform_4x4_luma_add(dst, coeffs, stride);
        else
            s->hevcdsp.transform_add[log2_trafo_size - 2](dst, coeffs, stride);
    }
}

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static int hls_transform_unit(HEVCContext *s, int x0, int y0,
                              int xBase, int yBase, int cb_xBase, int cb_yBase,
                              int log2_cb_size, int log2_trafo_size,
                              int trafo_depth, int blk_idx)
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{
    HEVCLocalContext *lc = &s->HEVClc;

    if (lc->cu.pred_mode == MODE_INTRA) {
        int trafo_size = 1 << log2_trafo_size;
        ff_hevc_set_neighbour_available(s, x0, y0, trafo_size, trafo_size);

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        s->hpc.intra_pred[log2_trafo_size - 2](s, x0, y0, 0);
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        if (log2_trafo_size > 2) {
            trafo_size = trafo_size << (s->sps->hshift[1] - 1);
            ff_hevc_set_neighbour_available(s, x0, y0, trafo_size, trafo_size);
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            s->hpc.intra_pred[log2_trafo_size - 3](s, x0, y0, 1);
            s->hpc.intra_pred[log2_trafo_size - 3](s, x0, y0, 2);
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        } else if (blk_idx == 3) {
            trafo_size = trafo_size << s->sps->hshift[1];
            ff_hevc_set_neighbour_available(s, xBase, yBase,
                                            trafo_size, trafo_size);
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            s->hpc.intra_pred[log2_trafo_size - 2](s, xBase, yBase, 1);
            s->hpc.intra_pred[log2_trafo_size - 2](s, xBase, yBase, 2);
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        }
    }

    if (lc->tt.cbf_luma ||
        SAMPLE_CBF(lc->tt.cbf_cb[trafo_depth], x0, y0) ||
        SAMPLE_CBF(lc->tt.cbf_cr[trafo_depth], x0, y0)) {
        int scan_idx   = SCAN_DIAG;
        int scan_idx_c = SCAN_DIAG;

        if (s->pps->cu_qp_delta_enabled_flag && !lc->tu.is_cu_qp_delta_coded) {
            lc->tu.cu_qp_delta = ff_hevc_cu_qp_delta_abs(s);
            if (lc->tu.cu_qp_delta != 0)
                if (ff_hevc_cu_qp_delta_sign_flag(s) == 1)
                    lc->tu.cu_qp_delta = -lc->tu.cu_qp_delta;
            lc->tu.is_cu_qp_delta_coded = 1;
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            if (lc->tu.cu_qp_delta < -(26 + s->sps->qp_bd_offset / 2) ||
                lc->tu.cu_qp_delta >  (25 + s->sps->qp_bd_offset / 2)) {
                av_log(s->avctx, AV_LOG_ERROR,
                       "The cu_qp_delta %d is outside the valid range "
                       "[%d, %d].\n",
                       lc->tu.cu_qp_delta,
                       -(26 + s->sps->qp_bd_offset / 2),
                        (25 + s->sps->qp_bd_offset / 2));
                return AVERROR_INVALIDDATA;
            }

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            ff_hevc_set_qPy(s, x0, y0, cb_xBase, cb_yBase, log2_cb_size);
        }

        if (lc->cu.pred_mode == MODE_INTRA && log2_trafo_size < 4) {
            if (lc->tu.cur_intra_pred_mode >= 6 &&
                lc->tu.cur_intra_pred_mode <= 14) {
                scan_idx = SCAN_VERT;
            } else if (lc->tu.cur_intra_pred_mode >= 22 &&
                       lc->tu.cur_intra_pred_mode <= 30) {
                scan_idx = SCAN_HORIZ;
            }

            if (lc->pu.intra_pred_mode_c >=  6 &&
                lc->pu.intra_pred_mode_c <= 14) {
                scan_idx_c = SCAN_VERT;
            } else if (lc->pu.intra_pred_mode_c >= 22 &&
                       lc->pu.intra_pred_mode_c <= 30) {
                scan_idx_c = SCAN_HORIZ;
            }
        }

        if (lc->tt.cbf_luma)
            hls_residual_coding(s, x0, y0, log2_trafo_size, scan_idx, 0);
        if (log2_trafo_size > 2) {
            if (SAMPLE_CBF(lc->tt.cbf_cb[trafo_depth], x0, y0))
                hls_residual_coding(s, x0, y0, log2_trafo_size - 1, scan_idx_c, 1);
            if (SAMPLE_CBF(lc->tt.cbf_cr[trafo_depth], x0, y0))
                hls_residual_coding(s, x0, y0, log2_trafo_size - 1, scan_idx_c, 2);
        } else if (blk_idx == 3) {
            if (SAMPLE_CBF(lc->tt.cbf_cb[trafo_depth], xBase, yBase))
                hls_residual_coding(s, xBase, yBase, log2_trafo_size, scan_idx_c, 1);
            if (SAMPLE_CBF(lc->tt.cbf_cr[trafo_depth], xBase, yBase))
                hls_residual_coding(s, xBase, yBase, log2_trafo_size, scan_idx_c, 2);
        }
    }
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    return 0;
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}

static void set_deblocking_bypass(HEVCContext *s, int x0, int y0, int log2_cb_size)
{
    int cb_size          = 1 << log2_cb_size;
    int log2_min_pu_size = s->sps->log2_min_pu_size;

    int min_pu_width     = s->sps->min_pu_width;
    int x_end = FFMIN(x0 + cb_size, s->sps->width);
    int y_end = FFMIN(y0 + cb_size, s->sps->height);
    int i, j;

    for (j = (y0 >> log2_min_pu_size); j < (y_end >> log2_min_pu_size); j++)
        for (i = (x0 >> log2_min_pu_size); i < (x_end >> log2_min_pu_size); i++)
            s->is_pcm[i + j * min_pu_width] = 2;
}

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static int hls_transform_tree(HEVCContext *s, int x0, int y0,
                              int xBase, int yBase, int cb_xBase, int cb_yBase,
                              int log2_cb_size, int log2_trafo_size,
                              int trafo_depth, int blk_idx)
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{
    HEVCLocalContext *lc = &s->HEVClc;
    uint8_t split_transform_flag;
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    int ret;
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    if (trafo_depth > 0 && log2_trafo_size == 2) {
        SAMPLE_CBF(lc->tt.cbf_cb[trafo_depth], x0, y0) =
            SAMPLE_CBF(lc->tt.cbf_cb[trafo_depth - 1], xBase, yBase);
        SAMPLE_CBF(lc->tt.cbf_cr[trafo_depth], x0, y0) =
            SAMPLE_CBF(lc->tt.cbf_cr[trafo_depth - 1], xBase, yBase);
    } else {
        SAMPLE_CBF(lc->tt.cbf_cb[trafo_depth], x0, y0) =
        SAMPLE_CBF(lc->tt.cbf_cr[trafo_depth], x0, y0) = 0;
    }

    if (lc->cu.intra_split_flag) {
        if (trafo_depth == 1)
            lc->tu.cur_intra_pred_mode = lc->pu.intra_pred_mode[blk_idx];
    } else {
        lc->tu.cur_intra_pred_mode = lc->pu.intra_pred_mode[0];
    }

    lc->tt.cbf_luma = 1;

    lc->tt.inter_split_flag = s->sps->max_transform_hierarchy_depth_inter == 0 &&
                              lc->cu.pred_mode == MODE_INTER &&
                              lc->cu.part_mode != PART_2Nx2N &&
                              trafo_depth == 0;

    if (log2_trafo_size <= s->sps->log2_max_trafo_size &&
        log2_trafo_size >  s->sps->log2_min_tb_size    &&
        trafo_depth     < lc->cu.max_trafo_depth       &&
        !(lc->cu.intra_split_flag && trafo_depth == 0)) {
        split_transform_flag = ff_hevc_split_transform_flag_decode(s, log2_trafo_size);
    } else {
        split_transform_flag = log2_trafo_size > s->sps->log2_max_trafo_size ||
                               (lc->cu.intra_split_flag && trafo_depth == 0) ||
                               lc->tt.inter_split_flag;
    }

    if (log2_trafo_size > 2) {
        if (trafo_depth == 0 ||
            SAMPLE_CBF(lc->tt.cbf_cb[trafo_depth - 1], xBase, yBase)) {
            SAMPLE_CBF(lc->tt.cbf_cb[trafo_depth], x0, y0) =
                ff_hevc_cbf_cb_cr_decode(s, trafo_depth);
        }

        if (trafo_depth == 0 ||
            SAMPLE_CBF(lc->tt.cbf_cr[trafo_depth - 1], xBase, yBase)) {
            SAMPLE_CBF(lc->tt.cbf_cr[trafo_depth], x0, y0) =
                ff_hevc_cbf_cb_cr_decode(s, trafo_depth);
        }
    }

    if (split_transform_flag) {
        int x1 = x0 + ((1 << log2_trafo_size) >> 1);
        int y1 = y0 + ((1 << log2_trafo_size) >> 1);

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        ret = hls_transform_tree(s, x0, y0, x0, y0, cb_xBase, cb_yBase,
                                 log2_cb_size, log2_trafo_size - 1,
                                 trafo_depth + 1, 0);
        if (ret < 0)
            return ret;
        ret = hls_transform_tree(s, x1, y0, x0, y0, cb_xBase, cb_yBase,
                                 log2_cb_size, log2_trafo_size - 1,
                                 trafo_depth + 1, 1);
        if (ret < 0)
            return ret;
        ret = hls_transform_tree(s, x0, y1, x0, y0, cb_xBase, cb_yBase,
                                 log2_cb_size, log2_trafo_size - 1,
                                 trafo_depth + 1, 2);
        if (ret < 0)
            return ret;
        ret = hls_transform_tree(s, x1, y1, x0, y0, cb_xBase, cb_yBase,
                                 log2_cb_size, log2_trafo_size - 1,
                                 trafo_depth + 1, 3);
        if (ret < 0)
            return ret;
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    } else {
        int min_tu_size      = 1 << s->sps->log2_min_tb_size;
        int log2_min_tu_size = s->sps->log2_min_tb_size;
        int min_tu_width     = s->sps->min_tb_width;

        if (lc->cu.pred_mode == MODE_INTRA || trafo_depth != 0 ||
            SAMPLE_CBF(lc->tt.cbf_cb[trafo_depth], x0, y0) ||
            SAMPLE_CBF(lc->tt.cbf_cr[trafo_depth], x0, y0)) {
            lc->tt.cbf_luma = ff_hevc_cbf_luma_decode(s, trafo_depth);
        }

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        ret = hls_transform_unit(s, x0, y0, xBase, yBase, cb_xBase, cb_yBase,
                                 log2_cb_size, log2_trafo_size, trafo_depth,
                                 blk_idx);
        if (ret < 0)
            return ret;
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        // TODO: store cbf_luma somewhere else
        if (lc->tt.cbf_luma) {
            int i, j;
            for (i = 0; i < (1 << log2_trafo_size); i += min_tu_size)
                for (j = 0; j < (1 << log2_trafo_size); j += min_tu_size) {
                    int x_tu = (x0 + j) >> log2_min_tu_size;
                    int y_tu = (y0 + i) >> log2_min_tu_size;
                    s->cbf_luma[y_tu * min_tu_width + x_tu] = 1;
                }
        }
        if (!s->sh.disable_deblocking_filter_flag) {
            ff_hevc_deblocking_boundary_strengths(s, x0, y0, log2_trafo_size,
                                                  lc->slice_or_tiles_up_boundary,
                                                  lc->slice_or_tiles_left_boundary);
            if (s->pps->transquant_bypass_enable_flag &&
                lc->cu.cu_transquant_bypass_flag)
                set_deblocking_bypass(s, x0, y0, log2_trafo_size);
        }
    }
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    return 0;
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}

static int hls_pcm_sample(HEVCContext *s, int x0, int y0, int log2_cb_size)
{
    //TODO: non-4:2:0 support
    HEVCLocalContext *lc = &s->HEVClc;
    GetBitContext gb;
    int cb_size   = 1 << log2_cb_size;
    int stride0   = s->frame->linesize[0];
    uint8_t *dst0 = &s->frame->data[0][y0 * stride0 + (x0 << s->sps->pixel_shift)];
    int   stride1 = s->frame->linesize[1];
    uint8_t *dst1 = &s->frame->data[1][(y0 >> s->sps->vshift[1]) * stride1 + ((x0 >> s->sps->hshift[1]) << s->sps->pixel_shift)];
    int   stride2 = s->frame->linesize[2];
    uint8_t *dst2 = &s->frame->data[2][(y0 >> s->sps->vshift[2]) * stride2 + ((x0 >> s->sps->hshift[2]) << s->sps->pixel_shift)];

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    int length         = cb_size * cb_size * s->sps->pcm.bit_depth + ((cb_size * cb_size) >> 1) * s->sps->pcm.bit_depth_chroma;
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    const uint8_t *pcm = skip_bytes(&lc->cc, (length + 7) >> 3);
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    int ret;

    ff_hevc_deblocking_boundary_strengths(s, x0, y0, log2_cb_size,
                                          lc->slice_or_tiles_up_boundary,
                                          lc->slice_or_tiles_left_boundary);

    ret = init_get_bits(&gb, pcm, length);
    if (ret < 0)
        return ret;

    s->hevcdsp.put_pcm(dst0, stride0, cb_size,     &gb, s->sps->pcm.bit_depth);
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    s->hevcdsp.put_pcm(dst1, stride1, cb_size / 2, &gb, s->sps->pcm.bit_depth_chroma);
    s->hevcdsp.put_pcm(dst2, stride2, cb_size / 2, &gb, s->sps->pcm.bit_depth_chroma);
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    return 0;
}

static void hls_mvd_coding(HEVCContext *s, int x0, int y0, int log2_cb_size)
{
    HEVCLocalContext *lc = &s->HEVClc;
    int x = ff_hevc_abs_mvd_greater0_flag_decode(s);
    int y = ff_hevc_abs_mvd_greater0_flag_decode(s);

    if (x)
        x += ff_hevc_abs_mvd_greater1_flag_decode(s);
    if (y)
        y += ff_hevc_abs_mvd_greater1_flag_decode(s);

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

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

/**
 * 8.5.3.2.2.1 Luma sample interpolation process
 *
 * @param s HEVC decoding context
 * @param dst target buffer for block data at block position
 * @param dststride stride of the dst buffer
 * @param ref reference picture buffer at origin (0, 0)
 * @param mv motion vector (relative to block position) to get pixel data from
 * @param x_off horizontal position of block from origin (0, 0)
 * @param y_off vertical position of block from origin (0, 0)
 * @param block_w width of block
 * @param block_h height of block
 */
static void luma_mc(HEVCContext *s, int16_t *dst, ptrdiff_t dststride,
                    AVFrame *ref, const Mv *mv, int x_off, int y_off,
                    int block_w, int block_h)
{
    HEVCLocalContext *lc = &s->HEVClc;
    uint8_t *src         = ref->data[0];
    ptrdiff_t srcstride  = ref->linesize[0];
    int pic_width        = s->sps->width;
    int pic_height       = s->sps->height;

    int mx         = mv->x & 3;
    int my         = mv->y & 3;
    int extra_left = ff_hevc_qpel_extra_before[mx];
    int extra_top  = ff_hevc_qpel_extra_before[my];

    x_off += mv->x >> 2;
    y_off += mv->y >> 2;
    src   += y_off * srcstride + (x_off << s->sps->pixel_shift);

    if (x_off < extra_left || y_off < extra_top ||
        x_off >= pic_width - block_w - ff_hevc_qpel_extra_after[mx] ||
        y_off >= pic_height - block_h - ff_hevc_qpel_extra_after[my]) {
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        const int edge_emu_stride = EDGE_EMU_BUFFER_STRIDE << s->sps->pixel_shift;
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        int offset = extra_top * srcstride + (extra_left << s->sps->pixel_shift);
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        int buf_offset = extra_top *
                         edge_emu_stride + (extra_left << s->sps->pixel_shift);
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        s->vdsp.emulated_edge_mc(lc->edge_emu_buffer, src - offset,
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                                 edge_emu_stride, srcstride,
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                                 block_w + ff_hevc_qpel_extra[mx],
                                 block_h + ff_hevc_qpel_extra[my],
                                 x_off - extra_left, y_off - extra_top,
                                 pic_width, pic_height);
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        src = lc->edge_emu_buffer + buf_offset;
        srcstride = edge_emu_stride;
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    }
    s->hevcdsp.put_hevc_qpel[my][mx](dst, dststride, src, srcstride, block_w,
                                     block_h, lc->mc_buffer);
}

/**
 * 8.5.3.2.2.2 Chroma sample interpolation process
 *
 * @param s HEVC decoding context
 * @param dst1 target buffer for block data at block position (U plane)
 * @param dst2 target buffer for block data at block position (V plane)
 * @param dststride stride of the dst1 and dst2 buffers
 * @param ref reference picture buffer at origin (0, 0)
 * @param mv motion vector (relative to block position) to get pixel data from
 * @param x_off horizontal position of block from origin (0, 0)
 * @param y_off vertical position of block from origin (0, 0)
 * @param block_w width of block
 * @param block_h height of block
 */
static void chroma_mc(HEVCContext *s, int16_t *dst1, int16_t *dst2,
                      ptrdiff_t dststride, AVFrame *ref, const Mv *mv,
                      int x_off, int y_off, int block_w, int block_h)
{
    HEVCLocalContext *lc = &s->HEVClc;
    uint8_t *src1        = ref->data[1];
    uint8_t *src2        = ref->data[2];
    ptrdiff_t src1stride = ref->linesize[1];
    ptrdiff_t src2stride = ref->linesize[2];
    int pic_width        = s->sps->width >> 1;
    int pic_height       = s->sps->height >> 1;

    int mx = mv->x & 7;
    int my = mv->y & 7;

    x_off += mv->x >> 3;
    y_off += mv->y >> 3;
    src1  += y_off * src1stride + (x_off << s->sps->pixel_shift);
    src2  += y_off * src2stride + (x_off << s->sps->pixel_shift);

    if (x_off < EPEL_EXTRA_BEFORE || y_off < EPEL_EXTRA_AFTER ||
        x_off >= pic_width - block_w - EPEL_EXTRA_AFTER ||
        y_off >= pic_height - block_h - EPEL_EXTRA_AFTER) {
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        const int edge_emu_stride = EDGE_EMU_BUFFER_STRIDE << s->sps->pixel_shift;
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        int offset1 = EPEL_EXTRA_BEFORE * (src1stride + (1 << s->sps->pixel_shift));
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        int buf_offset1 = EPEL_EXTRA_BEFORE *
                          (edge_emu_stride + (1 << s->sps->pixel_shift));
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        int offset2 = EPEL_EXTRA_BEFORE * (src2stride + (1 << s->sps->pixel_shift));
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        int buf_offset2 = EPEL_EXTRA_BEFORE *
                          (edge_emu_stride + (1 << s->sps->pixel_shift));
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        s->vdsp.emulated_edge_mc(lc->edge_emu_buffer, src1 - offset1,
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                                 edge_emu_stride, src1stride,
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                                 block_w + EPEL_EXTRA, block_h + EPEL_EXTRA,
                                 x_off - EPEL_EXTRA_BEFORE,
                                 y_off - EPEL_EXTRA_BEFORE,
                                 pic_width, pic_height);

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        src1 = lc->edge_emu_buffer + buf_offset1;
        src1stride = edge_emu_stride;
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        s->hevcdsp.put_hevc_epel[!!my][!!mx](dst1, dststride, src1, src1stride,
                                             block_w, block_h, mx, my, lc->mc_buffer);

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        s->vdsp.emulated_edge_mc(lc->edge_emu_buffer, src2 - offset2,
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                                 edge_emu_stride, src2stride,
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