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/*
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 * H263 internal header
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#ifndef AVCODEC_H263_H
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#define AVCODEC_H263_H
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#include <stdint.h>
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#include "libavutil/rational.h"
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#include "get_bits.h"
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#include "mpegvideo.h"
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#include "rl.h"
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// The defines below define the number of bits that are read at once for
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// reading vlc values. Changing these may improve speed and data cache needs
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// be aware though that decreasing them may need the number of stages that is
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// passed to get_vlc* to be increased.
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#define INTRA_MCBPC_VLC_BITS 6
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#define INTER_MCBPC_VLC_BITS 7
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#define CBPY_VLC_BITS 6
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#define TEX_VLC_BITS 9
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extern const AVRational ff_h263_pixel_aspect[16];
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extern const uint8_t ff_h263_cbpy_tab[16][2];
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extern const uint8_t cbpc_b_tab[4][2];
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extern const uint8_t mvtab[33][2];
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extern const uint8_t ff_h263_intra_MCBPC_code[9];
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extern const uint8_t ff_h263_intra_MCBPC_bits[9];
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extern const uint8_t ff_h263_inter_MCBPC_code[28];
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extern const uint8_t ff_h263_inter_MCBPC_bits[28];
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extern const uint8_t h263_mbtype_b_tab[15][2];
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extern VLC ff_h263_intra_MCBPC_vlc;
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extern VLC ff_h263_inter_MCBPC_vlc;
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extern VLC ff_h263_cbpy_vlc;
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extern RLTable ff_h263_rl_inter;
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extern RLTable rl_intra_aic;
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extern const uint16_t h263_format[8][2];
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extern const uint8_t modified_quant_tab[2][32];
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extern uint16_t ff_mba_max[6];
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extern uint8_t ff_mba_length[7];
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extern uint8_t ff_h263_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
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int h263_decode_motion(MpegEncContext * s, int pred, int f_code);
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av_const int ff_h263_aspect_to_info(AVRational aspect);
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int ff_h263_decode_init(AVCodecContext *avctx);
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int ff_h263_decode_frame(AVCodecContext *avctx,
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                             void *data, int *data_size,
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                             AVPacket *avpkt);
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int ff_h263_decode_end(AVCodecContext *avctx);
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void h263_encode_mb(MpegEncContext *s,
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                    DCTELEM block[6][64],
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                    int motion_x, int motion_y);
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void h263_encode_picture_header(MpegEncContext *s, int picture_number);
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void h263_encode_gob_header(MpegEncContext * s, int mb_line);
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int16_t *h263_pred_motion(MpegEncContext * s, int block, int dir,
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                        int *px, int *py);
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void h263_encode_init(MpegEncContext *s);
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void h263_decode_init_vlc(MpegEncContext *s);
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int h263_decode_picture_header(MpegEncContext *s);
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int ff_h263_decode_gob_header(MpegEncContext *s);
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void ff_h263_update_motion_val(MpegEncContext * s);
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void ff_h263_loop_filter(MpegEncContext * s);
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int ff_h263_decode_mba(MpegEncContext *s);
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void ff_h263_encode_mba(MpegEncContext *s);
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void ff_init_qscale_tab(MpegEncContext *s);
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int h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr);
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void h263_pred_acdc(MpegEncContext * s, DCTELEM *block, int n);
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/**
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 * Print picture info if FF_DEBUG_PICT_INFO is set.
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 */
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void ff_h263_show_pict_info(MpegEncContext *s);
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int ff_intel_h263_decode_picture_header(MpegEncContext *s);
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int ff_h263_decode_mb(MpegEncContext *s,
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                      DCTELEM block[6][64]);
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/**
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 * Return the value of the 3bit "source format" syntax element.
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 * This represents some standard picture dimensions or indicates that
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 * width&height are explicitly stored later.
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 */
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int av_const h263_get_picture_format(int width, int height);
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void ff_clean_h263_qscales(MpegEncContext *s);
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int ff_h263_resync(MpegEncContext *s);
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const uint8_t *ff_h263_find_resync_marker(const uint8_t *p, const uint8_t *end);
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int ff_h263_get_gob_height(MpegEncContext *s);
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void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code);
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static inline int h263_get_motion_length(MpegEncContext * s, int val, int f_code){
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    int l, bit_size, code;
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    if (val == 0) {
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        return mvtab[0][1];
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    } else {
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        bit_size = f_code - 1;
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        /* modulo encoding */
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        l= INT_BIT - 6 - bit_size;
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        val = (val<<l)>>l;
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        val--;
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        code = (val >> bit_size) + 1;
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        return mvtab[code][1] + 1 + bit_size;
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    }
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}
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static inline void ff_h263_encode_motion_vector(MpegEncContext * s, int x, int y, int f_code){
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    if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
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        skip_put_bits(&s->pb,
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            h263_get_motion_length(s, x, f_code)
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           +h263_get_motion_length(s, y, f_code));
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    }else{
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        ff_h263_encode_motion(s, x, f_code);
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        ff_h263_encode_motion(s, y, f_code);
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    }
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}
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static inline int get_p_cbp(MpegEncContext * s,
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                      DCTELEM block[6][64],
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                      int motion_x, int motion_y){
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    int cbp, i;
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    if(s->flags & CODEC_FLAG_CBP_RD){
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        int best_cbpy_score= INT_MAX;
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        int best_cbpc_score= INT_MAX;
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        int cbpc = (-1), cbpy= (-1);
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        const int offset= (s->mv_type==MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0);
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        const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
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        for(i=0; i<4; i++){
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            int score= ff_h263_inter_MCBPC_bits[i + offset] * lambda;
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            if(i&1) score += s->coded_score[5];
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            if(i&2) score += s->coded_score[4];
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            if(score < best_cbpc_score){
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                best_cbpc_score= score;
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                cbpc= i;
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            }
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        }
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        for(i=0; i<16; i++){
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            int score= ff_h263_cbpy_tab[i ^ 0xF][1] * lambda;
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            if(i&1) score += s->coded_score[3];
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            if(i&2) score += s->coded_score[2];
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            if(i&4) score += s->coded_score[1];
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            if(i&8) score += s->coded_score[0];
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            if(score < best_cbpy_score){
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                best_cbpy_score= score;
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                cbpy= i;
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            }
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        }
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        cbp= cbpc + 4*cbpy;
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        if ((motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16){
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            if(best_cbpy_score + best_cbpc_score + 2*lambda >= 0)
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                cbp= 0;
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        }
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        for (i = 0; i < 6; i++) {
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            if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
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                s->block_last_index[i]= -1;
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                s->dsp.clear_block(s->block[i]);
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            }
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        }
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    }else{
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        cbp= 0;
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        for (i = 0; i < 6; i++) {
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            if (s->block_last_index[i] >= 0)
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                cbp |= 1 << (5 - i);
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        }
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    }
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    return cbp;
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}
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static inline int get_b_cbp(MpegEncContext * s, DCTELEM block[6][64],
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                            int motion_x, int motion_y, int mb_type){
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    int cbp=0, i;
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    if(s->flags & CODEC_FLAG_CBP_RD){
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        int score=0;
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        const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
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        for(i=0; i<6; i++){
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            if(s->coded_score[i] < 0){
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                score += s->coded_score[i];
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                cbp |= 1 << (5 - i);
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            }
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        }
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        if(cbp){
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            int zero_score= -6;
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            if ((motion_x | motion_y | s->dquant | mb_type) == 0){
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                zero_score-= 4; //2*MV + mb_type + cbp bit
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            }
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            zero_score*= lambda;
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            if(zero_score <= score){
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                cbp=0;
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            }
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        }
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        for (i = 0; i < 6; i++) {
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            if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
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                s->block_last_index[i]= -1;
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                s->dsp.clear_block(s->block[i]);
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            }
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        }
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    }else{
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        for (i = 0; i < 6; i++) {
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            if (s->block_last_index[i] >= 0)
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                cbp |= 1 << (5 - i);
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        }
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    }
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    return cbp;
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}
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static inline void memsetw(short *tab, int val, int n)
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{
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    int i;
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    for(i=0;i<n;i++)
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        tab[i] = val;
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}
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#endif