static int encode_picture(MpegEncContext *s, int picture_number)

{

    int i, ret;

    int bits;

    int context_count = s->slice_context_count;



    s->picture_number = picture_number;



    

    s->me.mb_var_sum_temp    =

    s->me.mc_mb_var_sum_temp = 0;



    

    

    if (s->codec_id == AV_CODEC_ID_MPEG1VIDEO || s->codec_id == AV_CODEC_ID_MPEG2VIDEO || (s->h263_pred && !s->msmpeg4_version))

        set_frame_distances(s);

    if(CONFIG_MPEG4_ENCODER && s->codec_id == AV_CODEC_ID_MPEG4)

        ff_set_mpeg4_time(s);



    s->me.scene_change_score=0;







    if(s->pict_type==AV_PICTURE_TYPE_I){

        if(s->msmpeg4_version >= 3) s->no_rounding=1;

        else                        s->no_rounding=0;

    }else if(s->pict_type!=AV_PICTURE_TYPE_B){

        if(s->flipflop_rounding || s->codec_id == AV_CODEC_ID_H263P || s->codec_id == AV_CODEC_ID_MPEG4)

            s->no_rounding ^= 1;

    }



    if(s->flags & CODEC_FLAG_PASS2){

        if (estimate_qp(s,1) < 0)

            return -1;

        ff_get_2pass_fcode(s);

    }else if(!(s->flags & CODEC_FLAG_QSCALE)){

        if(s->pict_type==AV_PICTURE_TYPE_B)

            s->lambda= s->last_lambda_for[s->pict_type];

        else

            s->lambda= s->last_lambda_for[s->last_non_b_pict_type];

        update_qscale(s);

    }



    if(s->codec_id != AV_CODEC_ID_AMV && s->codec_id != AV_CODEC_ID_MJPEG){

        if(s->q_chroma_intra_matrix   != s->q_intra_matrix  ) av_freep(&s->q_chroma_intra_matrix);

        if(s->q_chroma_intra_matrix16 != s->q_intra_matrix16) av_freep(&s->q_chroma_intra_matrix16);

        s->q_chroma_intra_matrix   = s->q_intra_matrix;

        s->q_chroma_intra_matrix16 = s->q_intra_matrix16;

    }



    s->mb_intra=0; 

    for(i=1; i<context_count; i++){

        ret = ff_update_duplicate_context(s->thread_context[i], s);

        if (ret < 0)

            return ret;

    }



    if(ff_init_me(s)<0)

        return -1;



    

    if(s->pict_type != AV_PICTURE_TYPE_I){

        s->lambda = (s->lambda * s->avctx->me_penalty_compensation + 128)>>8;

        s->lambda2= (s->lambda2* (int64_t)s->avctx->me_penalty_compensation + 128)>>8;

        if (s->pict_type != AV_PICTURE_TYPE_B) {

            if((s->avctx->pre_me && s->last_non_b_pict_type==AV_PICTURE_TYPE_I) || s->avctx->pre_me==2){

                s->avctx->execute(s->avctx, pre_estimate_motion_thread, &s->thread_context[0], NULL, context_count, sizeof(void*));

            }

        }



        s->avctx->execute(s->avctx, estimate_motion_thread, &s->thread_context[0], NULL, context_count, sizeof(void*));

    }else {

        

        for(i=0; i<s->mb_stride*s->mb_height; i++)

            s->mb_type[i]= CANDIDATE_MB_TYPE_INTRA;



        if(!s->fixed_qscale){

            

            s->avctx->execute(s->avctx, mb_var_thread, &s->thread_context[0], NULL, context_count, sizeof(void*));

        }

    }

    for(i=1; i<context_count; i++){

        merge_context_after_me(s, s->thread_context[i]);

    }

    s->current_picture.mc_mb_var_sum= s->current_picture_ptr->mc_mb_var_sum= s->me.mc_mb_var_sum_temp;

    s->current_picture.   mb_var_sum= s->current_picture_ptr->   mb_var_sum= s->me.   mb_var_sum_temp;

    emms_c();



    if(s->me.scene_change_score > s->avctx->scenechange_threshold && s->pict_type == AV_PICTURE_TYPE_P){

        s->pict_type= AV_PICTURE_TYPE_I;

        for(i=0; i<s->mb_stride*s->mb_height; i++)

            s->mb_type[i]= CANDIDATE_MB_TYPE_INTRA;

        if(s->msmpeg4_version >= 3)

            s->no_rounding=1;

        av_dlog(s, "Scene change detected, encoding as I Frame %d %d\n",

                s->current_picture.mb_var_sum, s->current_picture.mc_mb_var_sum);

    }



    if(!s->umvplus){

        if(s->pict_type==AV_PICTURE_TYPE_P || s->pict_type==AV_PICTURE_TYPE_S) {

            s->f_code= ff_get_best_fcode(s, s->p_mv_table, CANDIDATE_MB_TYPE_INTER);



            if(s->flags & CODEC_FLAG_INTERLACED_ME){

                int a,b;

                a= ff_get_best_fcode(s, s->p_field_mv_table[0][0], CANDIDATE_MB_TYPE_INTER_I); 

                b= ff_get_best_fcode(s, s->p_field_mv_table[1][1], CANDIDATE_MB_TYPE_INTER_I);

                s->f_code= FFMAX3(s->f_code, a, b);

            }



            ff_fix_long_p_mvs(s);

            ff_fix_long_mvs(s, NULL, 0, s->p_mv_table, s->f_code, CANDIDATE_MB_TYPE_INTER, 0);

            if(s->flags & CODEC_FLAG_INTERLACED_ME){

                int j;

                for(i=0; i<2; i++){

                    for(j=0; j<2; j++)

                        ff_fix_long_mvs(s, s->p_field_select_table[i], j,

                                        s->p_field_mv_table[i][j], s->f_code, CANDIDATE_MB_TYPE_INTER_I, 0);

                }

            }

        }



        if(s->pict_type==AV_PICTURE_TYPE_B){

            int a, b;



            a = ff_get_best_fcode(s, s->b_forw_mv_table, CANDIDATE_MB_TYPE_FORWARD);

            b = ff_get_best_fcode(s, s->b_bidir_forw_mv_table, CANDIDATE_MB_TYPE_BIDIR);

            s->f_code = FFMAX(a, b);



            a = ff_get_best_fcode(s, s->b_back_mv_table, CANDIDATE_MB_TYPE_BACKWARD);

            b = ff_get_best_fcode(s, s->b_bidir_back_mv_table, CANDIDATE_MB_TYPE_BIDIR);

            s->b_code = FFMAX(a, b);



            ff_fix_long_mvs(s, NULL, 0, s->b_forw_mv_table, s->f_code, CANDIDATE_MB_TYPE_FORWARD, 1);

            ff_fix_long_mvs(s, NULL, 0, s->b_back_mv_table, s->b_code, CANDIDATE_MB_TYPE_BACKWARD, 1);

            ff_fix_long_mvs(s, NULL, 0, s->b_bidir_forw_mv_table, s->f_code, CANDIDATE_MB_TYPE_BIDIR, 1);

            ff_fix_long_mvs(s, NULL, 0, s->b_bidir_back_mv_table, s->b_code, CANDIDATE_MB_TYPE_BIDIR, 1);

            if(s->flags & CODEC_FLAG_INTERLACED_ME){

                int dir, j;

                for(dir=0; dir<2; dir++){

                    for(i=0; i<2; i++){

                        for(j=0; j<2; j++){

                            int type= dir ? (CANDIDATE_MB_TYPE_BACKWARD_I|CANDIDATE_MB_TYPE_BIDIR_I)

                                          : (CANDIDATE_MB_TYPE_FORWARD_I |CANDIDATE_MB_TYPE_BIDIR_I);

                            ff_fix_long_mvs(s, s->b_field_select_table[dir][i], j,

                                            s->b_field_mv_table[dir][i][j], dir ? s->b_code : s->f_code, type, 1);

                        }

                    }

                }

            }

        }

    }



    if (estimate_qp(s, 0) < 0)

        return -1;



    if(s->qscale < 3 && s->max_qcoeff<=128 && s->pict_type==AV_PICTURE_TYPE_I && !(s->flags & CODEC_FLAG_QSCALE))

        s->qscale= 3; 



    if (s->out_format == FMT_MJPEG) {

        const uint16_t *  luma_matrix = ff_mpeg1_default_intra_matrix;

        const uint16_t *chroma_matrix = ff_mpeg1_default_intra_matrix;



        if (s->avctx->intra_matrix) {

            chroma_matrix =

            luma_matrix = s->avctx->intra_matrix;

        }

        if (s->avctx->chroma_intra_matrix)

            chroma_matrix = s->avctx->chroma_intra_matrix;



        

        for(i=1;i<64;i++){

            int j= s->dsp.idct_permutation[i];



            s->chroma_intra_matrix[j] = av_clip_uint8((chroma_matrix[i] * s->qscale) >> 3);

            s->       intra_matrix[j] = av_clip_uint8((  luma_matrix[i] * s->qscale) >> 3);

        }

        s->y_dc_scale_table=

        s->c_dc_scale_table= ff_mpeg2_dc_scale_table[s->intra_dc_precision];

        s->chroma_intra_matrix[0] =

        s->intra_matrix[0] = ff_mpeg2_dc_scale_table[s->intra_dc_precision][8];

        ff_convert_matrix(&s->dsp, s->q_intra_matrix, s->q_intra_matrix16,

                       s->intra_matrix, s->intra_quant_bias, 8, 8, 1);

        ff_convert_matrix(&s->dsp, s->q_chroma_intra_matrix, s->q_chroma_intra_matrix16,

                       s->chroma_intra_matrix, s->intra_quant_bias, 8, 8, 1);

        s->qscale= 8;

    }

    if(s->codec_id == AV_CODEC_ID_AMV){

        static const uint8_t y[32]={13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13};

        static const uint8_t c[32]={14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14};

        for(i=1;i<64;i++){

            int j= s->dsp.idct_permutation[ff_zigzag_direct[i]];



            s->intra_matrix[j] = sp5x_quant_table[5*2+0][i];

            s->chroma_intra_matrix[j] = sp5x_quant_table[5*2+1][i];

        }

        s->y_dc_scale_table= y;

        s->c_dc_scale_table= c;

        s->intra_matrix[0] = 13;

        s->chroma_intra_matrix[0] = 14;

        ff_convert_matrix(&s->dsp, s->q_intra_matrix, s->q_intra_matrix16,

                       s->intra_matrix, s->intra_quant_bias, 8, 8, 1);

        ff_convert_matrix(&s->dsp, s->q_chroma_intra_matrix, s->q_chroma_intra_matrix16,

                       s->chroma_intra_matrix, s->intra_quant_bias, 8, 8, 1);

        s->qscale= 8;

    }



    

    s->current_picture_ptr->f.key_frame =

    s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I; 

    s->current_picture_ptr->f.pict_type =

    s->current_picture.f.pict_type = s->pict_type;



    if (s->current_picture.f.key_frame)

        s->picture_in_gop_number=0;



    s->mb_x = s->mb_y = 0;

    s->last_bits= put_bits_count(&s->pb);

    switch(s->out_format) {

    case FMT_MJPEG:

        if (CONFIG_MJPEG_ENCODER)

            ff_mjpeg_encode_picture_header(s->avctx, &s->pb, &s->intra_scantable,

                                           s->intra_matrix, s->chroma_intra_matrix);

        break;

    case FMT_H261:

        if (CONFIG_H261_ENCODER)

            ff_h261_encode_picture_header(s, picture_number);

        break;

    case FMT_H263:

        if (CONFIG_WMV2_ENCODER && s->codec_id == AV_CODEC_ID_WMV2)

            ff_wmv2_encode_picture_header(s, picture_number);

        else if (CONFIG_MSMPEG4_ENCODER && s->msmpeg4_version)

            ff_msmpeg4_encode_picture_header(s, picture_number);

        else if (CONFIG_MPEG4_ENCODER && s->h263_pred)

            ff_mpeg4_encode_picture_header(s, picture_number);

        else if (CONFIG_RV10_ENCODER && s->codec_id == AV_CODEC_ID_RV10)

            ff_rv10_encode_picture_header(s, picture_number);

        else if (CONFIG_RV20_ENCODER && s->codec_id == AV_CODEC_ID_RV20)

            ff_rv20_encode_picture_header(s, picture_number);

        else if (CONFIG_FLV_ENCODER && s->codec_id == AV_CODEC_ID_FLV1)

            ff_flv_encode_picture_header(s, picture_number);

        else if (CONFIG_H263_ENCODER)

            ff_h263_encode_picture_header(s, picture_number);

        break;

    case FMT_MPEG1:

        if (CONFIG_MPEG1VIDEO_ENCODER || CONFIG_MPEG2VIDEO_ENCODER)

            ff_mpeg1_encode_picture_header(s, picture_number);

        break;

    default:

        av_assert0(0);

    }

    bits= put_bits_count(&s->pb);

    s->header_bits= bits - s->last_bits;



    for(i=1; i<context_count; i++){

        update_duplicate_context_after_me(s->thread_context[i], s);

    }

    s->avctx->execute(s->avctx, encode_thread, &s->thread_context[0], NULL, context_count, sizeof(void*));

    for(i=1; i<context_count; i++){

        merge_context_after_encode(s, s->thread_context[i]);

    }

    emms_c();

    return 0;

}
