static av_always_inline void encode_mb_internal(MpegEncContext *s,

                                                int motion_x, int motion_y,

                                                int mb_block_height,

                                                int mb_block_width,

                                                int mb_block_count)

{

    int16_t weight[12][64];

    int16_t orig[12][64];

    const int mb_x = s->mb_x;

    const int mb_y = s->mb_y;

    int i;

    int skip_dct[12];

    int dct_offset = s->linesize * 8; // default for progressive frames

    int uv_dct_offset = s->uvlinesize * 8;

    uint8_t *ptr_y, *ptr_cb, *ptr_cr;

    int wrap_y, wrap_c;



    for (i = 0; i < mb_block_count; i++)

        skip_dct[i] = s->skipdct;



    if (s->adaptive_quant) {

        const int last_qp = s->qscale;

        const int mb_xy = mb_x + mb_y * s->mb_stride;



        s->lambda = s->lambda_table[mb_xy];

        update_qscale(s);



        if (!(s->mpv_flags & FF_MPV_FLAG_QP_RD)) {

            s->qscale = s->current_picture_ptr->qscale_table[mb_xy];

            s->dquant = s->qscale - last_qp;



            if (s->out_format == FMT_H263) {

                s->dquant = av_clip(s->dquant, -2, 2);



                if (s->codec_id == AV_CODEC_ID_MPEG4) {

                    if (!s->mb_intra) {

                        if (s->pict_type == AV_PICTURE_TYPE_B) {

                            if (s->dquant & 1 || s->mv_dir & MV_DIRECT)

                                s->dquant = 0;

                        }

                        if (s->mv_type == MV_TYPE_8X8)

                            s->dquant = 0;

                    }

                }

            }

        }

        ff_set_qscale(s, last_qp + s->dquant);

    } else if (s->mpv_flags & FF_MPV_FLAG_QP_RD)

        ff_set_qscale(s, s->qscale + s->dquant);



    wrap_y = s->linesize;

    wrap_c = s->uvlinesize;

    ptr_y  = s->new_picture.f.data[0] +

             (mb_y * 16 * wrap_y)              + mb_x * 16;

    ptr_cb = s->new_picture.f.data[1] +

             (mb_y * mb_block_height * wrap_c) + mb_x * mb_block_width;

    ptr_cr = s->new_picture.f.data[2] +

             (mb_y * mb_block_height * wrap_c) + mb_x * mb_block_width;



    if((mb_x*16+16 > s->width || mb_y*16+16 > s->height) && s->codec_id != AV_CODEC_ID_AMV){

        uint8_t *ebuf = s->edge_emu_buffer + 32;

        int cw = (s->width  + s->chroma_x_shift) >> s->chroma_x_shift;

        int ch = (s->height + s->chroma_y_shift) >> s->chroma_y_shift;

        s->vdsp.emulated_edge_mc(ebuf, ptr_y, wrap_y, 16, 16, mb_x * 16,

                                 mb_y * 16, s->width, s->height);

        ptr_y = ebuf;

        s->vdsp.emulated_edge_mc(ebuf + 18 * wrap_y, ptr_cb, wrap_c, mb_block_width,

                                 mb_block_height, mb_x * mb_block_width, mb_y * mb_block_height,

                                 cw, ch);

        ptr_cb = ebuf + 18 * wrap_y;

        s->vdsp.emulated_edge_mc(ebuf + 18 * wrap_y + 16, ptr_cr, wrap_c, mb_block_width,

                                 mb_block_height, mb_x * mb_block_width, mb_y * mb_block_height,

                                 cw, ch);

        ptr_cr = ebuf + 18 * wrap_y + 16;

    }



    if (s->mb_intra) {

        if (s->flags & CODEC_FLAG_INTERLACED_DCT) {

            int progressive_score, interlaced_score;



            s->interlaced_dct = 0;

            progressive_score = s->dsp.ildct_cmp[4](s, ptr_y,

                                                    NULL, wrap_y, 8) +

                                s->dsp.ildct_cmp[4](s, ptr_y + wrap_y * 8,

                                                    NULL, wrap_y, 8) - 400;



            if (progressive_score > 0) {

                interlaced_score = s->dsp.ildct_cmp[4](s, ptr_y,

                                                       NULL, wrap_y * 2, 8) +

                                   s->dsp.ildct_cmp[4](s, ptr_y + wrap_y,

                                                       NULL, wrap_y * 2, 8);

                if (progressive_score > interlaced_score) {

                    s->interlaced_dct = 1;



                    dct_offset = wrap_y;

                    uv_dct_offset = wrap_c;

                    wrap_y <<= 1;

                    if (s->chroma_format == CHROMA_422 ||

                        s->chroma_format == CHROMA_444)

                        wrap_c <<= 1;

                }

            }

        }



        s->dsp.get_pixels(s->block[0], ptr_y                  , wrap_y);

        s->dsp.get_pixels(s->block[1], ptr_y              + 8 , wrap_y);

        s->dsp.get_pixels(s->block[2], ptr_y + dct_offset     , wrap_y);

        s->dsp.get_pixels(s->block[3], ptr_y + dct_offset + 8 , wrap_y);



        if (s->flags & CODEC_FLAG_GRAY) {

            skip_dct[4] = 1;

            skip_dct[5] = 1;

        } else {

            s->dsp.get_pixels(s->block[4], ptr_cb, wrap_c);

            s->dsp.get_pixels(s->block[5], ptr_cr, wrap_c);

            if (!s->chroma_y_shift && s->chroma_x_shift) { /* 422 */

                s->dsp.get_pixels(s->block[6], ptr_cb + uv_dct_offset, wrap_c);

                s->dsp.get_pixels(s->block[7], ptr_cr + uv_dct_offset, wrap_c);

            } else if (!s->chroma_y_shift && !s->chroma_x_shift) { /* 444 */

                s->dsp.get_pixels(s->block[6], ptr_cb + 8, wrap_c);

                s->dsp.get_pixels(s->block[7], ptr_cr + 8, wrap_c);

                s->dsp.get_pixels(s->block[8], ptr_cb + uv_dct_offset, wrap_c);

                s->dsp.get_pixels(s->block[9], ptr_cr + uv_dct_offset, wrap_c);

                s->dsp.get_pixels(s->block[10], ptr_cb + uv_dct_offset + 8, wrap_c);

                s->dsp.get_pixels(s->block[11], ptr_cr + uv_dct_offset + 8, wrap_c);

            }

        }

    } else {

        op_pixels_func (*op_pix)[4];

        qpel_mc_func (*op_qpix)[16];

        uint8_t *dest_y, *dest_cb, *dest_cr;



        dest_y  = s->dest[0];

        dest_cb = s->dest[1];

        dest_cr = s->dest[2];



        if ((!s->no_rounding) || s->pict_type == AV_PICTURE_TYPE_B) {

            op_pix  = s->hdsp.put_pixels_tab;

            op_qpix = s->dsp.put_qpel_pixels_tab;

        } else {

            op_pix  = s->hdsp.put_no_rnd_pixels_tab;

            op_qpix = s->dsp.put_no_rnd_qpel_pixels_tab;

        }



        if (s->mv_dir & MV_DIR_FORWARD) {

            ff_MPV_motion(s, dest_y, dest_cb, dest_cr, 0,

                          s->last_picture.f.data,

                          op_pix, op_qpix);

            op_pix  = s->hdsp.avg_pixels_tab;

            op_qpix = s->dsp.avg_qpel_pixels_tab;

        }

        if (s->mv_dir & MV_DIR_BACKWARD) {

            ff_MPV_motion(s, dest_y, dest_cb, dest_cr, 1,

                          s->next_picture.f.data,

                          op_pix, op_qpix);

        }



        if (s->flags & CODEC_FLAG_INTERLACED_DCT) {

            int progressive_score, interlaced_score;



            s->interlaced_dct = 0;

            progressive_score = s->dsp.ildct_cmp[0](s, dest_y,

                                                    ptr_y,              wrap_y,

                                                    8) +

                                s->dsp.ildct_cmp[0](s, dest_y + wrap_y * 8,

                                                    ptr_y + wrap_y * 8, wrap_y,

                                                    8) - 400;



            if (s->avctx->ildct_cmp == FF_CMP_VSSE)

                progressive_score -= 400;



            if (progressive_score > 0) {

                interlaced_score = s->dsp.ildct_cmp[0](s, dest_y,

                                                       ptr_y,

                                                       wrap_y * 2, 8) +

                                   s->dsp.ildct_cmp[0](s, dest_y + wrap_y,

                                                       ptr_y + wrap_y,

                                                       wrap_y * 2, 8);



                if (progressive_score > interlaced_score) {

                    s->interlaced_dct = 1;



                    dct_offset = wrap_y;

                    uv_dct_offset = wrap_c;

                    wrap_y <<= 1;

                    if (s->chroma_format == CHROMA_422)

                        wrap_c <<= 1;

                }

            }

        }



        s->dsp.diff_pixels(s->block[0], ptr_y, dest_y, wrap_y);

        s->dsp.diff_pixels(s->block[1], ptr_y + 8, dest_y + 8, wrap_y);

        s->dsp.diff_pixels(s->block[2], ptr_y + dct_offset,

                           dest_y + dct_offset, wrap_y);

        s->dsp.diff_pixels(s->block[3], ptr_y + dct_offset + 8,

                           dest_y + dct_offset + 8, wrap_y);



        if (s->flags & CODEC_FLAG_GRAY) {

            skip_dct[4] = 1;

            skip_dct[5] = 1;

        } else {

            s->dsp.diff_pixels(s->block[4], ptr_cb, dest_cb, wrap_c);

            s->dsp.diff_pixels(s->block[5], ptr_cr, dest_cr, wrap_c);

            if (!s->chroma_y_shift) { /* 422 */

                s->dsp.diff_pixels(s->block[6], ptr_cb + uv_dct_offset,

                                   dest_cb + uv_dct_offset, wrap_c);

                s->dsp.diff_pixels(s->block[7], ptr_cr + uv_dct_offset,

                                   dest_cr + uv_dct_offset, wrap_c);

            }

        }

        /* pre quantization */

        if (s->current_picture.mc_mb_var[s->mb_stride * mb_y + mb_x] <

                2 * s->qscale * s->qscale) {

            // FIXME optimize

            if (s->dsp.sad[1](NULL, ptr_y , dest_y,

                              wrap_y, 8) < 20 * s->qscale)

                skip_dct[0] = 1;

            if (s->dsp.sad[1](NULL, ptr_y + 8,

                              dest_y + 8, wrap_y, 8) < 20 * s->qscale)

                skip_dct[1] = 1;

            if (s->dsp.sad[1](NULL, ptr_y + dct_offset,

                              dest_y + dct_offset, wrap_y, 8) < 20 * s->qscale)

                skip_dct[2] = 1;

            if (s->dsp.sad[1](NULL, ptr_y + dct_offset + 8,

                              dest_y + dct_offset + 8,

                              wrap_y, 8) < 20 * s->qscale)

                skip_dct[3] = 1;

            if (s->dsp.sad[1](NULL, ptr_cb, dest_cb,

                              wrap_c, 8) < 20 * s->qscale)

                skip_dct[4] = 1;

            if (s->dsp.sad[1](NULL, ptr_cr, dest_cr,

                              wrap_c, 8) < 20 * s->qscale)

                skip_dct[5] = 1;

            if (!s->chroma_y_shift) { /* 422 */

                if (s->dsp.sad[1](NULL, ptr_cb + uv_dct_offset,

                                  dest_cb + uv_dct_offset,

                                  wrap_c, 8) < 20 * s->qscale)

                    skip_dct[6] = 1;

                if (s->dsp.sad[1](NULL, ptr_cr + uv_dct_offset,

                                  dest_cr + uv_dct_offset,

                                  wrap_c, 8) < 20 * s->qscale)

                    skip_dct[7] = 1;

            }

        }

    }



    if (s->quantizer_noise_shaping) {

        if (!skip_dct[0])

            get_visual_weight(weight[0], ptr_y                 , wrap_y);

        if (!skip_dct[1])

            get_visual_weight(weight[1], ptr_y              + 8, wrap_y);

        if (!skip_dct[2])

            get_visual_weight(weight[2], ptr_y + dct_offset    , wrap_y);

        if (!skip_dct[3])

            get_visual_weight(weight[3], ptr_y + dct_offset + 8, wrap_y);

        if (!skip_dct[4])

            get_visual_weight(weight[4], ptr_cb                , wrap_c);

        if (!skip_dct[5])

            get_visual_weight(weight[5], ptr_cr                , wrap_c);

        if (!s->chroma_y_shift) { /* 422 */

            if (!skip_dct[6])

                get_visual_weight(weight[6], ptr_cb + uv_dct_offset,

                                  wrap_c);

            if (!skip_dct[7])

                get_visual_weight(weight[7], ptr_cr + uv_dct_offset,

                                  wrap_c);

        }

        memcpy(orig[0], s->block[0], sizeof(int16_t) * 64 * mb_block_count);

    }



    /* DCT & quantize */

    av_assert2(s->out_format != FMT_MJPEG || s->qscale == 8);

    {

        for (i = 0; i < mb_block_count; i++) {

            if (!skip_dct[i]) {

                int overflow;

                s->block_last_index[i] = s->dct_quantize(s, s->block[i], i, s->qscale, &overflow);

                // FIXME we could decide to change to quantizer instead of

                // clipping

                // JS: I don't think that would be a good idea it could lower

                //     quality instead of improve it. Just INTRADC clipping

                //     deserves changes in quantizer

                if (overflow)

                    clip_coeffs(s, s->block[i], s->block_last_index[i]);

            } else

                s->block_last_index[i] = -1;

        }

        if (s->quantizer_noise_shaping) {

            for (i = 0; i < mb_block_count; i++) {

                if (!skip_dct[i]) {

                    s->block_last_index[i] =

                        dct_quantize_refine(s, s->block[i], weight[i],

                                            orig[i], i, s->qscale);

                }

            }

        }



        if (s->luma_elim_threshold && !s->mb_intra)

            for (i = 0; i < 4; i++)

                dct_single_coeff_elimination(s, i, s->luma_elim_threshold);

        if (s->chroma_elim_threshold && !s->mb_intra)

            for (i = 4; i < mb_block_count; i++)

                dct_single_coeff_elimination(s, i, s->chroma_elim_threshold);



        if (s->mpv_flags & FF_MPV_FLAG_CBP_RD) {

            for (i = 0; i < mb_block_count; i++) {

                if (s->block_last_index[i] == -1)

                    s->coded_score[i] = INT_MAX / 256;

            }

        }

    }



    if ((s->flags & CODEC_FLAG_GRAY) && s->mb_intra) {

        s->block_last_index[4] =

        s->block_last_index[5] = 0;

        s->block[4][0] =

        s->block[5][0] = (1024 + s->c_dc_scale / 2) / s->c_dc_scale;

        if (!s->chroma_y_shift) { /* 422 / 444 */

            for (i=6; i<12; i++) {

                s->block_last_index[i] = 0;

                s->block[i][0] = s->block[4][0];

            }

        }

    }



    // non c quantize code returns incorrect block_last_index FIXME

    if (s->alternate_scan && s->dct_quantize != ff_dct_quantize_c) {

        for (i = 0; i < mb_block_count; i++) {

            int j;

            if (s->block_last_index[i] > 0) {

                for (j = 63; j > 0; j--) {

                    if (s->block[i][s->intra_scantable.permutated[j]])

                        break;

                }

                s->block_last_index[i] = j;

            }

        }

    }



    /* huffman encode */

    switch(s->codec_id){ //FIXME funct ptr could be slightly faster

    case AV_CODEC_ID_MPEG1VIDEO:

    case AV_CODEC_ID_MPEG2VIDEO:

        if (CONFIG_MPEG1VIDEO_ENCODER || CONFIG_MPEG2VIDEO_ENCODER)

            ff_mpeg1_encode_mb(s, s->block, motion_x, motion_y);

        break;

    case AV_CODEC_ID_MPEG4:

        if (CONFIG_MPEG4_ENCODER)

            ff_mpeg4_encode_mb(s, s->block, motion_x, motion_y);

        break;

    case AV_CODEC_ID_MSMPEG4V2:

    case AV_CODEC_ID_MSMPEG4V3:

    case AV_CODEC_ID_WMV1:

        if (CONFIG_MSMPEG4_ENCODER)

            ff_msmpeg4_encode_mb(s, s->block, motion_x, motion_y);

        break;

    case AV_CODEC_ID_WMV2:

        if (CONFIG_WMV2_ENCODER)

            ff_wmv2_encode_mb(s, s->block, motion_x, motion_y);

        break;

    case AV_CODEC_ID_H261:

        if (CONFIG_H261_ENCODER)

            ff_h261_encode_mb(s, s->block, motion_x, motion_y);

        break;

    case AV_CODEC_ID_H263:

    case AV_CODEC_ID_H263P:

    case AV_CODEC_ID_FLV1:

    case AV_CODEC_ID_RV10:

    case AV_CODEC_ID_RV20:

        if (CONFIG_H263_ENCODER)

            ff_h263_encode_mb(s, s->block, motion_x, motion_y);

        break;

    case AV_CODEC_ID_MJPEG:

    case AV_CODEC_ID_AMV:

        if (CONFIG_MJPEG_ENCODER)

            ff_mjpeg_encode_mb(s, s->block);

        break;

    default:

        av_assert1(0);

    }

}
