static void chroma_mc_bi(HEVCContext *s, uint8_t *dst0, ptrdiff_t dststride, AVFrame *ref0, AVFrame *ref1,
                         int x_off, int y_off, int block_w, int block_h, struct MvField *current_mv, int cidx)
{
    HEVCLocalContext *lc = s->HEVClc;
    uint8_t *src1        = ref0->data[cidx+1];
    uint8_t *src2        = ref1->data[cidx+1];
    ptrdiff_t src1stride = ref0->linesize[cidx+1];
    ptrdiff_t src2stride = ref1->linesize[cidx+1];
    int weight_flag      = (s->sh.slice_type == HEVC_SLICE_P && s->ps.pps->weighted_pred_flag) ||
                           (s->sh.slice_type == HEVC_SLICE_B && s->ps.pps->weighted_bipred_flag);
    int pic_width        = s->ps.sps->width >> s->ps.sps->hshift[1];
    int pic_height       = s->ps.sps->height >> s->ps.sps->vshift[1];
    Mv *mv0              = &current_mv->mv[0];
    Mv *mv1              = &current_mv->mv[1];
    int hshift = s->ps.sps->hshift[1];
    int vshift = s->ps.sps->vshift[1];

    intptr_t mx0 = av_mod_uintp2(mv0->x, 2 + hshift);
    intptr_t my0 = av_mod_uintp2(mv0->y, 2 + vshift);
    intptr_t mx1 = av_mod_uintp2(mv1->x, 2 + hshift);
    intptr_t my1 = av_mod_uintp2(mv1->y, 2 + vshift);
    intptr_t _mx0 = mx0 << (1 - hshift);
    intptr_t _my0 = my0 << (1 - vshift);
    intptr_t _mx1 = mx1 << (1 - hshift);
    intptr_t _my1 = my1 << (1 - vshift);

    int x_off0 = x_off + (mv0->x >> (2 + hshift));
    int y_off0 = y_off + (mv0->y >> (2 + vshift));
    int x_off1 = x_off + (mv1->x >> (2 + hshift));
    int y_off1 = y_off + (mv1->y >> (2 + vshift));
    int idx = ff_hevc_pel_weight[block_w];
    src1  += y_off0 * src1stride + (int)((unsigned)x_off0 << s->ps.sps->pixel_shift);
    src2  += y_off1 * src2stride + (int)((unsigned)x_off1 << s->ps.sps->pixel_shift);

    if (x_off0 < EPEL_EXTRA_BEFORE || y_off0 < EPEL_EXTRA_AFTER ||
        x_off0 >= pic_width - block_w - EPEL_EXTRA_AFTER ||
        y_off0 >= pic_height - block_h - EPEL_EXTRA_AFTER) {
        const int edge_emu_stride = EDGE_EMU_BUFFER_STRIDE << s->ps.sps->pixel_shift;
        int offset1 = EPEL_EXTRA_BEFORE * (src1stride + (1 << s->ps.sps->pixel_shift));
        int buf_offset1 = EPEL_EXTRA_BEFORE *
                          (edge_emu_stride + (1 << s->ps.sps->pixel_shift));

        s->vdsp.emulated_edge_mc(lc->edge_emu_buffer, src1 - offset1,
                                 edge_emu_stride, src1stride,
                                 block_w + EPEL_EXTRA, block_h + EPEL_EXTRA,
                                 x_off0 - EPEL_EXTRA_BEFORE,
                                 y_off0 - EPEL_EXTRA_BEFORE,
                                 pic_width, pic_height);

        src1 = lc->edge_emu_buffer + buf_offset1;
        src1stride = edge_emu_stride;
    }

    if (x_off1 < EPEL_EXTRA_BEFORE || y_off1 < EPEL_EXTRA_AFTER ||
        x_off1 >= pic_width - block_w - EPEL_EXTRA_AFTER ||
        y_off1 >= pic_height - block_h - EPEL_EXTRA_AFTER) {
        const int edge_emu_stride = EDGE_EMU_BUFFER_STRIDE << s->ps.sps->pixel_shift;
        int offset1 = EPEL_EXTRA_BEFORE * (src2stride + (1 << s->ps.sps->pixel_shift));
        int buf_offset1 = EPEL_EXTRA_BEFORE *
                          (edge_emu_stride + (1 << s->ps.sps->pixel_shift));

        s->vdsp.emulated_edge_mc(lc->edge_emu_buffer2, src2 - offset1,
                                 edge_emu_stride, src2stride,
                                 block_w + EPEL_EXTRA, block_h + EPEL_EXTRA,
                                 x_off1 - EPEL_EXTRA_BEFORE,
                                 y_off1 - EPEL_EXTRA_BEFORE,
                                 pic_width, pic_height);

        src2 = lc->edge_emu_buffer2 + buf_offset1;
        src2stride = edge_emu_stride;
    }

    s->hevcdsp.put_hevc_epel[idx][!!my0][!!mx0](lc->tmp, src1, src1stride,
                                                block_h, _mx0, _my0, block_w);
    if (!weight_flag)
        s->hevcdsp.put_hevc_epel_bi[idx][!!my1][!!mx1](dst0, s->frame->linesize[cidx+1],
                                                       src2, src2stride, lc->tmp,
                                                       block_h, _mx1, _my1, block_w);
    else
        s->hevcdsp.put_hevc_epel_bi_w[idx][!!my1][!!mx1](dst0, s->frame->linesize[cidx+1],
                                                         src2, src2stride, lc->tmp,
                                                         block_h,
                                                         s->sh.chroma_log2_weight_denom,
                                                         s->sh.chroma_weight_l0[current_mv->ref_idx[0]][cidx],
                                                         s->sh.chroma_weight_l1[current_mv->ref_idx[1]][cidx],
                                                         s->sh.chroma_offset_l0[current_mv->ref_idx[0]][cidx],
                                                         s->sh.chroma_offset_l1[current_mv->ref_idx[1]][cidx],
                                                         _mx1, _my1, block_w);
}