h263.c 163 KB
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/*
 * H263/MPEG4 backend for ffmpeg encoder and decoder
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 * Copyright (c) 2000,2001 Fabrice Bellard.
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 * H263+ support.
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 * Copyright (c) 2001 Juan J. Sierralta P.
 *
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 * This library 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 of the License, or (at your option) any later version.
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 *
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 * This library 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
 * 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
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *
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 * ac prediction encoding, b-frame support, error resilience, optimizations,
 * qpel decoding, gmc decoding, interlaced decoding, 
 * by Michael Niedermayer <michaelni@gmx.at>
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 */
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/**
 * @file h263.c
 * @brief h263/mpeg4 codec
 *
 */
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//#define DEBUG
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#include "common.h"
#include "dsputil.h"
#include "avcodec.h"
#include "mpegvideo.h"
#include "h263data.h"
#include "mpeg4data.h"

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//#undef NDEBUG
//#include <assert.h>

#if 1
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#define PRINT_MB_TYPE(a) {}
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#else
#define PRINT_MB_TYPE(a) printf(a)
#endif
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#define INTRA_MCBPC_VLC_BITS 6
#define INTER_MCBPC_VLC_BITS 6
#define CBPY_VLC_BITS 6
#define MV_VLC_BITS 9
#define DC_VLC_BITS 9
#define SPRITE_TRAJ_VLC_BITS 6
#define MB_TYPE_B_VLC_BITS 4
#define TEX_VLC_BITS 9

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#ifdef CONFIG_ENCODERS
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static void h263_encode_block(MpegEncContext * s, DCTELEM * block,
			      int n);
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static void h263_encode_motion(MpegEncContext * s, int val, int fcode);
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static void h263p_encode_umotion(MpegEncContext * s, int val);
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static inline void mpeg4_encode_block(MpegEncContext * s, DCTELEM * block,
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			       int n, int dc, uint8_t *scan_table, 
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                               PutBitContext *dc_pb, PutBitContext *ac_pb);
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#endif

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static int h263_decode_motion(MpegEncContext * s, int pred, int fcode);
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static int h263p_decode_umotion(MpegEncContext * s, int pred);
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static int h263_decode_block(MpegEncContext * s, DCTELEM * block,
                             int n, int coded);
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static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr);
static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
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                              int n, int coded, int intra);
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static int h263_pred_dc(MpegEncContext * s, int n, uint16_t **dc_val_ptr);
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#ifdef CONFIG_ENCODERS
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static void mpeg4_inv_pred_ac(MpegEncContext * s, DCTELEM *block, int n,
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                              int dir);
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#endif //CONFIG_ENCODERS
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static void mpeg4_decode_sprite_trajectory(MpegEncContext * s);
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static inline int ff_mpeg4_pred_dc(MpegEncContext * s, int n, uint16_t **dc_val_ptr, int *dir_ptr);
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extern uint32_t inverse[256];
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#ifdef CONFIG_ENCODERS
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static uint8_t uni_DCtab_lum_len[512];
static uint8_t uni_DCtab_chrom_len[512];
static uint16_t uni_DCtab_lum_bits[512];
static uint16_t uni_DCtab_chrom_bits[512];
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static uint16_t (*mv_penalty)[MAX_MV*2+1]= NULL;
static uint8_t fcode_tab[MAX_MV*2+1];
static uint8_t umv_fcode_tab[MAX_MV*2+1];
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static uint32_t uni_mpeg4_intra_rl_bits[64*64*2*2];
static uint8_t  uni_mpeg4_intra_rl_len [64*64*2*2];
static uint32_t uni_mpeg4_inter_rl_bits[64*64*2*2];
static uint8_t  uni_mpeg4_inter_rl_len [64*64*2*2];
//#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128 + (run)*256 + (level))
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//#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run) + (level)*64)
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#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run)*128 + (level))
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/* mpeg4
inter
max level: 24/6
max run: 53/63

intra
max level: 53/16
max run: 29/41
*/
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#endif

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int h263_get_picture_format(int width, int height)
{
    int format;

    if (width == 128 && height == 96)
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        format = 1;
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    else if (width == 176 && height == 144)
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        format = 2;
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    else if (width == 352 && height == 288)
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        format = 3;
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    else if (width == 704 && height == 576)
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        format = 4;
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    else if (width == 1408 && height == 1152)
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        format = 5;
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    else
        format = 7;
    return format;
}

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#ifdef CONFIG_ENCODERS

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static void float_aspect_to_info(MpegEncContext * s, float aspect){
    int i;

    aspect*= s->height/(double)s->width;
//printf("%f\n", aspect);
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    if(aspect==0) aspect= 1.0;

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    ff_float2fraction(&s->aspected_width, &s->aspected_height, aspect, 255);
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//printf("%d %d\n", s->aspected_width, s->aspected_height);
    for(i=1; i<6; i++){
        if(s->aspected_width == pixel_aspect[i][0] && s->aspected_height== pixel_aspect[i][1]){
            s->aspect_ratio_info=i;
            return;
        }
    }
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    s->aspect_ratio_info= FF_ASPECT_EXTENDED;
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}

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void h263_encode_picture_header(MpegEncContext * s, int picture_number)
{
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    int format;
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    align_put_bits(&s->pb);
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    /* Update the pointer to last GOB */
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    s->ptr_lastgob = pbBufPtr(&s->pb);
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    s->gob_number = 0;

    put_bits(&s->pb, 22, 0x20); /* PSC */
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    put_bits(&s->pb, 8, (((int64_t)s->picture_number * 30 * FRAME_RATE_BASE) / 
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                         s->frame_rate) & 0xff);

    put_bits(&s->pb, 1, 1);	/* marker */
    put_bits(&s->pb, 1, 0);	/* h263 id */
    put_bits(&s->pb, 1, 0);	/* split screen off */
    put_bits(&s->pb, 1, 0);	/* camera  off */
    put_bits(&s->pb, 1, 0);	/* freeze picture release off */
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    format = h263_get_picture_format(s->width, s->height);
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    if (!s->h263_plus) {
        /* H.263v1 */
        put_bits(&s->pb, 3, format);
        put_bits(&s->pb, 1, (s->pict_type == P_TYPE));
        /* By now UMV IS DISABLED ON H.263v1, since the restrictions
        of H.263v1 UMV implies to check the predicted MV after
        calculation of the current MB to see if we're on the limits */
        put_bits(&s->pb, 1, 0);	/* unrestricted motion vector: off */
        put_bits(&s->pb, 1, 0);	/* SAC: off */
        put_bits(&s->pb, 1, 0);	/* advanced prediction mode: off */
        put_bits(&s->pb, 1, 0);	/* not PB frame */
        put_bits(&s->pb, 5, s->qscale);
        put_bits(&s->pb, 1, 0);	/* Continuous Presence Multipoint mode: off */
    } else {
        /* H.263v2 */
        /* H.263 Plus PTYPE */
        put_bits(&s->pb, 3, 7);
        put_bits(&s->pb,3,1); /* Update Full Extended PTYPE */
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        if (format == 7)
            put_bits(&s->pb,3,6); /* Custom Source Format */
        else
            put_bits(&s->pb, 3, format);
            
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        put_bits(&s->pb,1,0); /* Custom PCF: off */
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        s->umvplus = s->unrestricted_mv;
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        put_bits(&s->pb, 1, s->umvplus); /* Unrestricted Motion Vector */
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        put_bits(&s->pb,1,0); /* SAC: off */
        put_bits(&s->pb,1,0); /* Advanced Prediction Mode: off */
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        put_bits(&s->pb,1,s->h263_aic); /* Advanced Intra Coding */
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        put_bits(&s->pb,1,0); /* Deblocking Filter: off */
        put_bits(&s->pb,1,0); /* Slice Structured: off */
        put_bits(&s->pb,1,0); /* Reference Picture Selection: off */
        put_bits(&s->pb,1,0); /* Independent Segment Decoding: off */
        put_bits(&s->pb,1,0); /* Alternative Inter VLC: off */
        put_bits(&s->pb,1,0); /* Modified Quantization: off */
        put_bits(&s->pb,1,1); /* "1" to prevent start code emulation */
        put_bits(&s->pb,3,0); /* Reserved */
		
        put_bits(&s->pb, 3, s->pict_type == P_TYPE);
		
        put_bits(&s->pb,1,0); /* Reference Picture Resampling: off */
        put_bits(&s->pb,1,0); /* Reduced-Resolution Update: off */
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        put_bits(&s->pb,1,s->no_rounding); /* Rounding Type */
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        put_bits(&s->pb,2,0); /* Reserved */
        put_bits(&s->pb,1,1); /* "1" to prevent start code emulation */
		
        /* This should be here if PLUSPTYPE */
        put_bits(&s->pb, 1, 0);	/* Continuous Presence Multipoint mode: off */
		
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		if (format == 7) {
            /* Custom Picture Format (CPFMT) */
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            float_aspect_to_info(s, s->avctx->aspect_ratio);
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            put_bits(&s->pb,4,s->aspect_ratio_info);
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            put_bits(&s->pb,9,(s->width >> 2) - 1);
            put_bits(&s->pb,1,1); /* "1" to prevent start code emulation */
            put_bits(&s->pb,9,(s->height >> 2));
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	    if (s->aspect_ratio_info == FF_ASPECT_EXTENDED)
	    {
		put_bits(&s->pb, 8, s->aspected_width);
		put_bits(&s->pb, 8, s->aspected_height);
	    }
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        }
        
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        /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */
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        if (s->umvplus)
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//            put_bits(&s->pb,1,1); /* Limited according tables of Annex D */
            put_bits(&s->pb,2,1); /* unlimited */

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        put_bits(&s->pb, 5, s->qscale);
    }

    put_bits(&s->pb, 1, 0);	/* no PEI */
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    if(s->h263_aic){
         s->y_dc_scale_table= 
         s->c_dc_scale_table= h263_aic_dc_scale_table;
    }else{
        s->y_dc_scale_table=
        s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
    }
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}

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/**
 * Encodes a group of blocks header.
 */
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int h263_encode_gob_header(MpegEncContext * s, int mb_line)
{
           align_put_bits(&s->pb);
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           flush_put_bits(&s->pb);
           /* Call the RTP callback to send the last GOB */
           if (s->rtp_callback) {
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               int pdif = pbBufPtr(&s->pb) - s->ptr_lastgob;
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               s->rtp_callback(s->ptr_lastgob, pdif, s->gob_number);
           }
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           put_bits(&s->pb, 17, 1); /* GBSC */
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           s->gob_number = mb_line / s->gob_index;
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           put_bits(&s->pb, 5, s->gob_number); /* GN */
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           put_bits(&s->pb, 2, s->pict_type == I_TYPE); /* GFID */
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           put_bits(&s->pb, 5, s->qscale); /* GQUANT */
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           //fprintf(stderr,"\nGOB: %2d size: %d", s->gob_number - 1, pdif);
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    return 0;
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}
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static inline int decide_ac_pred(MpegEncContext * s, DCTELEM block[6][64], int dir[6])
{
    int score0=0, score1=0;
    int i, n;
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    int8_t * const qscale_table= s->current_picture.qscale_table;
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    for(n=0; n<6; n++){
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        int16_t *ac_val, *ac_val1;
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        ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
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        ac_val1= ac_val;
        if(dir[n]){
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            const int xy= s->mb_x + s->mb_y*s->mb_width - s->mb_width;
            /* top prediction */
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            ac_val-= s->block_wrap[n]*16;
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            if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){
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                /* same qscale */
                for(i=1; i<8; i++){
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                    const int level= block[n][s->idct_permutation[i   ]];
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                    score0+= ABS(level);
                    score1+= ABS(level - ac_val[i+8]);
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                    ac_val1[i  ]=    block[n][s->idct_permutation[i<<3]];
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                    ac_val1[i+8]= level;
                }
            }else{
                /* different qscale, we must rescale */
                for(i=1; i<8; i++){
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                    const int level= block[n][s->idct_permutation[i   ]];
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                    score0+= ABS(level);
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                    score1+= ABS(level - ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale));
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                    ac_val1[i  ]=    block[n][s->idct_permutation[i<<3]];
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                    ac_val1[i+8]= level;
                }
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            }
        }else{
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            const int xy= s->mb_x-1 + s->mb_y*s->mb_width;
            /* left prediction */
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            ac_val-= 16;
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            if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){
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                /* same qscale */
                for(i=1; i<8; i++){
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                    const int level= block[n][s->idct_permutation[i<<3]];
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                    score0+= ABS(level);
                    score1+= ABS(level - ac_val[i]);
                    ac_val1[i  ]= level;
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                    ac_val1[i+8]=    block[n][s->idct_permutation[i   ]];
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                }
            }else{
                /* different qscale, we must rescale */
                for(i=1; i<8; i++){
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                    const int level= block[n][s->idct_permutation[i<<3]];
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                    score0+= ABS(level);
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                    score1+= ABS(level - ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale));
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                    ac_val1[i  ]= level;
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                    ac_val1[i+8]=    block[n][s->idct_permutation[i   ]];
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                }
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            }
        }
    }

    return score0 > score1 ? 1 : 0;    
}

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/**
 * modify qscale so that encoding is acually possible in h263 (limit difference to -2..2)
 */
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void ff_clean_h263_qscales(MpegEncContext *s){
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    int i;
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    int8_t * const qscale_table= s->current_picture.qscale_table;
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    for(i=1; i<s->mb_num; i++){
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        if(qscale_table[i] - qscale_table[i-1] >2)
            qscale_table[i]= qscale_table[i-1]+2;
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    }
    for(i=s->mb_num-2; i>=0; i--){
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        if(qscale_table[i] - qscale_table[i+1] >2)
            qscale_table[i]= qscale_table[i+1]+2;
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    }
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}

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/**
 * modify mb_type & qscale so that encoding is acually possible in mpeg4
 */
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void ff_clean_mpeg4_qscales(MpegEncContext *s){
    int i;
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    int8_t * const qscale_table= s->current_picture.qscale_table;

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    ff_clean_h263_qscales(s);
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    for(i=1; i<s->mb_num; i++){
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        if(qscale_table[i] != qscale_table[i-1] && (s->mb_type[i]&MB_TYPE_INTER4V)){
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            s->mb_type[i]&= ~MB_TYPE_INTER4V;
            s->mb_type[i]|= MB_TYPE_INTER;
        }
    }

    if(s->pict_type== B_TYPE){
        int odd=0;
        /* ok, come on, this isnt funny anymore, theres more code for handling this mpeg4 mess than
           for the actual adaptive quantization */
        
        for(i=0; i<s->mb_num; i++){
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            odd += qscale_table[i]&1;
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        }
        
        if(2*odd > s->mb_num) odd=1;
        else                  odd=0;
        
        for(i=0; i<s->mb_num; i++){
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            if((qscale_table[i]&1) != odd)
                qscale_table[i]++;
            if(qscale_table[i] > 31)
                qscale_table[i]= 31;
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        }            
    
        for(i=1; i<s->mb_num; i++){
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            if(qscale_table[i] != qscale_table[i-1] && (s->mb_type[i]&MB_TYPE_DIRECT)){
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                s->mb_type[i]&= ~MB_TYPE_DIRECT;
                s->mb_type[i]|= MB_TYPE_BIDIR;
            }
        }
    }
}

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#endif //CONFIG_ENCODERS

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void ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my){
    const int mb_index= s->mb_x + s->mb_y*s->mb_width;
    int xy= s->block_index[0];
    uint16_t time_pp= s->pp_time;
    uint16_t time_pb= s->pb_time;
    int i;
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    //FIXME avoid divides
    switch(s->co_located_type_table[mb_index]){
    case 0:
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        s->mv[0][0][0] = s->mv[0][1][0] = s->mv[0][2][0] = s->mv[0][3][0] = s->motion_val[xy][0]*time_pb/time_pp + mx;
        s->mv[0][0][1] = s->mv[0][1][1] = s->mv[0][2][1] = s->mv[0][3][1] = s->motion_val[xy][1]*time_pb/time_pp + my;
        s->mv[1][0][0] = s->mv[1][1][0] = s->mv[1][2][0] = s->mv[1][3][0] = mx ? s->mv[0][0][0] - s->motion_val[xy][0]
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                            : s->motion_val[xy][0]*(time_pb - time_pp)/time_pp;
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        s->mv[1][0][1] = s->mv[1][1][1] = s->mv[1][2][1] = s->mv[1][3][1] = my ? s->mv[0][0][1] - s->motion_val[xy][1] 
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                            : s->motion_val[xy][1]*(time_pb - time_pp)/time_pp;
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        if((s->avctx->workaround_bugs & FF_BUG_DIRECT_BLOCKSIZE) || !s->quarter_sample)
            s->mv_type= MV_TYPE_16X16;
        else
            s->mv_type= MV_TYPE_8X8;
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        break;
    case CO_LOCATED_TYPE_4MV:
        s->mv_type = MV_TYPE_8X8;
        for(i=0; i<4; i++){
            xy= s->block_index[i];
            s->mv[0][i][0] = s->motion_val[xy][0]*time_pb/time_pp + mx;
            s->mv[0][i][1] = s->motion_val[xy][1]*time_pb/time_pp + my;
            s->mv[1][i][0] = mx ? s->mv[0][i][0] - s->motion_val[xy][0]
                                : s->motion_val[xy][0]*(time_pb - time_pp)/time_pp;
            s->mv[1][i][1] = my ? s->mv[0][i][1] - s->motion_val[xy][1] 
                                : s->motion_val[xy][1]*(time_pb - time_pp)/time_pp;
        }
        break;
    case CO_LOCATED_TYPE_FIELDMV:
        s->mv_type = MV_TYPE_FIELD;
        for(i=0; i<2; i++){
            if(s->top_field_first){
                time_pp= s->pp_field_time - s->field_select_table[mb_index][i] + i;
                time_pb= s->pb_field_time - s->field_select_table[mb_index][i] + i;
            }else{
                time_pp= s->pp_field_time + s->field_select_table[mb_index][i] - i;
                time_pb= s->pb_field_time + s->field_select_table[mb_index][i] - i;
            }
            s->mv[0][i][0] = s->field_mv_table[mb_index][i][0]*time_pb/time_pp + mx;
            s->mv[0][i][1] = s->field_mv_table[mb_index][i][1]*time_pb/time_pp + my;
            s->mv[1][i][0] = mx ? s->mv[0][i][0] - s->field_mv_table[mb_index][i][0]
                                : s->field_mv_table[mb_index][i][0]*(time_pb - time_pp)/time_pp;
            s->mv[1][i][1] = my ? s->mv[0][i][1] - s->field_mv_table[mb_index][i][1] 
                                : s->field_mv_table[mb_index][i][1]*(time_pb - time_pp)/time_pp;
        }
        break;
    }
}

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#ifdef CONFIG_ENCODERS
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void mpeg4_encode_mb(MpegEncContext * s,
		    DCTELEM block[6][64],
		    int motion_x, int motion_y)
{
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    int cbpc, cbpy, pred_x, pred_y;
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    int bits;
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    PutBitContext * const pb2    = s->data_partitioning                         ? &s->pb2    : &s->pb;
    PutBitContext * const tex_pb = s->data_partitioning && s->pict_type!=B_TYPE ? &s->tex_pb : &s->pb;
    PutBitContext * const dc_pb  = s->data_partitioning && s->pict_type!=I_TYPE ? &s->pb2    : &s->pb;
    const int interleaved_stats= (s->flags&CODEC_FLAG_PASS1) && !s->data_partitioning ? 1 : 0;
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    const int dquant_code[5]= {1,0,9,2,3};
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    //    printf("**mb x=%d y=%d\n", s->mb_x, s->mb_y);
    if (!s->mb_intra) {
        /* compute cbp */
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        int i, cbp = 0;
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        for (i = 0; i < 6; i++) {
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            if (s->block_last_index[i] >= 0)
                cbp |= 1 << (5 - i);
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        }
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        if(s->pict_type==B_TYPE){
            static const int mb_type_table[8]= {-1, 2, 3, 1,-1,-1,-1, 0}; /* convert from mv_dir to type */
            int mb_type=  mb_type_table[s->mv_dir];
            
            if(s->mb_x==0){
                s->last_mv[0][0][0]= 
                s->last_mv[0][0][1]= 
                s->last_mv[1][0][0]= 
                s->last_mv[1][0][1]= 0;
            }
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            assert(s->dquant>=-2 && s->dquant<=2);
            assert((s->dquant&1)==0);
            assert(mb_type>=0);
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            /* nothing to do if this MB was skiped in the next P Frame */
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            if(s->next_picture.mbskip_table[s->mb_y * s->mb_width + s->mb_x]){ //FIXME avoid DCT & ...
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                s->skip_count++;
                s->mv[0][0][0]= 
                s->mv[0][0][1]= 
                s->mv[1][0][0]= 
                s->mv[1][0][1]= 0;
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                s->mv_dir= MV_DIR_FORWARD; //doesnt matter
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                s->qscale -= s->dquant;
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//                s->mb_skiped=1;

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                return;
            }
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            if ((cbp | motion_x | motion_y | mb_type) ==0) {
                /* direct MB with MV={0,0} */
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                assert(s->dquant==0);
                
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                put_bits(&s->pb, 1, 1); /* mb not coded modb1=1 */
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                if(interleaved_stats){
                    s->misc_bits++;
                    s->last_bits++;
                }
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                s->skip_count++;
                return;
            }
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            put_bits(&s->pb, 1, 0);	/* mb coded modb1=0 */
            put_bits(&s->pb, 1, cbp ? 0 : 1); /* modb2 */ //FIXME merge
            put_bits(&s->pb, mb_type+1, 1); // this table is so simple that we dont need it :)
            if(cbp) put_bits(&s->pb, 6, cbp);
            
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            if(cbp && mb_type){
                if(s->dquant)
                    put_bits(&s->pb, 2, (s->dquant>>2)+3);
                else
                    put_bits(&s->pb, 1, 0);
            }else
                s->qscale -= s->dquant;
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            if(!s->progressive_sequence){
                if(cbp)
                    put_bits(&s->pb, 1, s->interlaced_dct);
                if(mb_type) // not diect mode
                    put_bits(&s->pb, 1, 0); // no interlaced ME yet
            }
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            if(interleaved_stats){
                bits= get_bit_count(&s->pb);
                s->misc_bits+= bits - s->last_bits;
                s->last_bits=bits;
            }
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            switch(mb_type)
            {
            case 0: /* direct */
                h263_encode_motion(s, motion_x, 1);
                h263_encode_motion(s, motion_y, 1);                
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                s->b_count++;
                s->f_count++;
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                break;
            case 1: /* bidir */
                h263_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
                h263_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
                h263_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
                h263_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
                s->last_mv[0][0][0]= s->mv[0][0][0];
                s->last_mv[0][0][1]= s->mv[0][0][1];
                s->last_mv[1][0][0]= s->mv[1][0][0];
                s->last_mv[1][0][1]= s->mv[1][0][1];
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                s->b_count++;
                s->f_count++;
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                break;
            case 2: /* backward */
                h263_encode_motion(s, motion_x - s->last_mv[1][0][0], s->b_code);
                h263_encode_motion(s, motion_y - s->last_mv[1][0][1], s->b_code);
                s->last_mv[1][0][0]= motion_x;
                s->last_mv[1][0][1]= motion_y;
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                s->b_count++;
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                break;
            case 3: /* forward */
                h263_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);
                h263_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);
                s->last_mv[0][0][0]= motion_x;
                s->last_mv[0][0][1]= motion_y;
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                s->f_count++;
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                break;
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            default:
                printf("unknown mb type\n");
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                return;
            }
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            if(interleaved_stats){
                bits= get_bit_count(&s->pb);
                s->mv_bits+= bits - s->last_bits;
                s->last_bits=bits;
            }
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            /* encode each block */
            for (i = 0; i < 6; i++) {
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                mpeg4_encode_block(s, block[i], i, 0, s->intra_scantable.permutated, NULL, &s->pb);
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            }

            if(interleaved_stats){
                bits= get_bit_count(&s->pb);
                s->p_tex_bits+= bits - s->last_bits;
                s->last_bits=bits;
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            }
        }else{ /* s->pict_type==B_TYPE */
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            if ((cbp | motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16) {
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                /* check if the B frames can skip it too, as we must skip it if we skip here 
                   why didnt they just compress the skip-mb bits instead of reusing them ?! */
                if(s->max_b_frames>0){
                    int i;
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                    int x,y, offset;
                    uint8_t *p_pic;

                    x= s->mb_x*16;
                    y= s->mb_y*16;
                    if(x+16 > s->width)  x= s->width-16;
                    if(y+16 > s->height) y= s->height-16;

                    offset= x + y*s->linesize;
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                    p_pic= s->new_picture.data[0] + offset;
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                    s->mb_skiped=1;
                    for(i=0; i<s->max_b_frames; i++){
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                        uint8_t *b_pic;
                        int diff;
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                        Picture *pic= s->reordered_input_picture[i+1];
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                        if(pic==NULL || pic->pict_type!=B_TYPE) break;
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                        b_pic= pic->data[0] + offset + 16; //FIXME +16
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			diff= s->dsp.pix_abs16x16(p_pic, b_pic, s->linesize);
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                        if(diff>s->qscale*70){ //FIXME check that 70 is optimal
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                            s->mb_skiped=0;
                            break;
                        }
                    }
                }else
                    s->mb_skiped=1; 

                if(s->mb_skiped==1){
                    /* skip macroblock */
                    put_bits(&s->pb, 1, 1);
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                    if(interleaved_stats){
                        s->misc_bits++;
                        s->last_bits++;
                    }
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                    s->skip_count++;
                    return;
                }
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            }
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            put_bits(&s->pb, 1, 0);	/* mb coded */
            if(s->mv_type==MV_TYPE_16X16){
                cbpc = cbp & 3;
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                if(s->dquant) cbpc+= 8;
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                put_bits(&s->pb,
                        inter_MCBPC_bits[cbpc],
                        inter_MCBPC_code[cbpc]);
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                cbpy = cbp >> 2;
                cbpy ^= 0xf;
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                put_bits(pb2, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
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                if(s->dquant)
                    put_bits(pb2, 2, dquant_code[s->dquant+2]);
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                if(!s->progressive_sequence){
                    if(cbp)
                        put_bits(pb2, 1, s->interlaced_dct);
                    put_bits(pb2, 1, 0); // no interlaced ME yet
                }
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                if(interleaved_stats){
                    bits= get_bit_count(&s->pb);
                    s->misc_bits+= bits - s->last_bits;
                    s->last_bits=bits;
                }
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                /* motion vectors: 16x16 mode */
                h263_pred_motion(s, 0, &pred_x, &pred_y);
            
                h263_encode_motion(s, motion_x - pred_x, s->f_code);
                h263_encode_motion(s, motion_y - pred_y, s->f_code);
            }else{
                cbpc = (cbp & 3)+16;
                put_bits(&s->pb,
                        inter_MCBPC_bits[cbpc],
                        inter_MCBPC_code[cbpc]);
                cbpy = cbp >> 2;
                cbpy ^= 0xf;
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                put_bits(pb2, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
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                if(!s->progressive_sequence){
                    if(cbp)
                        put_bits(pb2, 1, s->interlaced_dct);
                }
    
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                if(interleaved_stats){
                    bits= get_bit_count(&s->pb);
                    s->misc_bits+= bits - s->last_bits;
                    s->last_bits=bits;
                }
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                for(i=0; i<4; i++){
                    /* motion vectors: 8x8 mode*/
                    h263_pred_motion(s, i, &pred_x, &pred_y);

                    h263_encode_motion(s, s->motion_val[ s->block_index[i] ][0] - pred_x, s->f_code);
                    h263_encode_motion(s, s->motion_val[ s->block_index[i] ][1] - pred_y, s->f_code);
                }
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            }
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            if(interleaved_stats){ 
                bits= get_bit_count(&s->pb);
                s->mv_bits+= bits - s->last_bits;
                s->last_bits=bits;
            }
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            /* encode each block */
            for (i = 0; i < 6; i++) {
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                mpeg4_encode_block(s, block[i], i, 0, s->intra_scantable.permutated, NULL, tex_pb);
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            }

            if(interleaved_stats){
                bits= get_bit_count(&s->pb);
                s->p_tex_bits+= bits - s->last_bits;
                s->last_bits=bits;
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            }
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            s->f_count++;
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        }
    } else {
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        int cbp;
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        int dc_diff[6];   //dc values with the dc prediction subtracted 
        int dir[6];  //prediction direction
        int zigzag_last_index[6];
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	uint8_t *scan_table[6];
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        int i;
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        for(i=0; i<6; i++){
            const int level= block[i][0];
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            uint16_t *dc_ptr;
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            dc_diff[i]= level - ff_mpeg4_pred_dc(s, i, &dc_ptr, &dir[i]);
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            if (i < 4) {
                *dc_ptr = level * s->y_dc_scale;
            } else {
                *dc_ptr = level * s->c_dc_scale;
            }
        }

        s->ac_pred= decide_ac_pred(s, block, dir);

        if(s->ac_pred){
            for(i=0; i<6; i++){
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                uint8_t *st;
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                int last_index;

                mpeg4_inv_pred_ac(s, block[i], i, dir[i]);
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                if (dir[i]==0) st = s->intra_v_scantable.permutated; /* left */
                else           st = s->intra_h_scantable.permutated; /* top */
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                for(last_index=63; last_index>=0; last_index--) //FIXME optimize
                    if(block[i][st[last_index]]) break;
                zigzag_last_index[i]= s->block_last_index[i];
                s->block_last_index[i]= last_index;
                scan_table[i]= st;
            }
        }else{
            for(i=0; i<6; i++)
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                scan_table[i]= s->intra_scantable.permutated;
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        }

        /* compute cbp */
        cbp = 0;
        for (i = 0; i < 6; i++) {
            if (s->block_last_index[i] >= 1)
                cbp |= 1 << (5 - i);
        }

        cbpc = cbp & 3;
        if (s->pict_type == I_TYPE) {
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            if(s->dquant) cbpc+=4;
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            put_bits(&s->pb,
                intra_MCBPC_bits[cbpc],
                intra_MCBPC_code[cbpc]);
        } else {
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            if(s->dquant) cbpc+=8;
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            put_bits(&s->pb, 1, 0);	/* mb coded */
            put_bits(&s->pb,
                inter_MCBPC_bits[cbpc + 4],
                inter_MCBPC_code[cbpc + 4]);
        }
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        put_bits(pb2, 1, s->ac_pred);
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        cbpy = cbp >> 2;
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        put_bits(pb2, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
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        if(s->dquant)
            put_bits(dc_pb, 2, dquant_code[s->dquant+2]);
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        if(!s->progressive_sequence){
            put_bits(dc_pb, 1, s->interlaced_dct);
        }

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        if(interleaved_stats){
            bits= get_bit_count(&s->pb);
            s->misc_bits+= bits - s->last_bits;
            s->last_bits=bits;
        }
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        /* encode each block */
        for (i = 0; i < 6; i++) {
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            mpeg4_encode_block(s, block[i], i, dc_diff[i], scan_table[i], dc_pb, tex_pb);
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        }

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        if(interleaved_stats){
            bits= get_bit_count(&s->pb);
            s->i_tex_bits+= bits - s->last_bits;
            s->last_bits=bits;
        }
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        s->i_count++;

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        /* restore ac coeffs & last_index stuff if we messed them up with the prediction */
        if(s->ac_pred){
            for(i=0; i<6; i++){
                int j;    
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                int16_t *ac_val;
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                ac_val = s->ac_val[0][0] + s->block_index[i] * 16;
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                if(dir[i]){
                    for(j=1; j<8; j++) 
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                        block[i][s->idct_permutation[j   ]]= ac_val[j+8];
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                }else{
                    for(j=1; j<8; j++) 
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                        block[i][s->idct_permutation[j<<3]]= ac_val[j  ];
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                }
                s->block_last_index[i]= zigzag_last_index[i];
            }
        }
    }
}

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void h263_encode_mb(MpegEncContext * s,
		    DCTELEM block[6][64],
		    int motion_x, int motion_y)
{
    int cbpc, cbpy, i, cbp, pred_x, pred_y;
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    int16_t pred_dc;
    int16_t rec_intradc[6];
    uint16_t *dc_ptr[6];
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    const int dquant_code[5]= {1,0,9,2,3};
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    //printf("**mb x=%d y=%d\n", s->mb_x, s->mb_y);
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    if (!s->mb_intra) {
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        /* compute cbp */
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        cbp = 0;
        for (i = 0; i < 6; i++) {
            if (s->block_last_index[i] >= 0)
                cbp |= 1 << (5 - i);
        }
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        if ((cbp | motion_x | motion_y | s->dquant) == 0) {
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            /* skip macroblock */
            put_bits(&s->pb, 1, 1);
            return;
        }
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        put_bits(&s->pb, 1, 0);	/* mb coded */
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        cbpc = cbp & 3;
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        if(s->dquant) cbpc+= 8;
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        put_bits(&s->pb,