Split the mpeg4 encoder and decoder off h263.c

Originally committed as revision 21079 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 1351 insertions, 0 deletions

diff --git a/libavcodec/mpeg4videoenc.c b/libavcodec/mpeg4videoenc.c
new file mode 100644
index 0000000000..64cbecba9a
--- /dev/null
+++ b/libavcodec/mpeg4videoenc.c
@@ -0,0 +1,1351 @@
+/*
+ * MPEG4 encoder.
+ * Copyright (c) 2000,2001 Fabrice Bellard
+ * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "mpegvideo.h"
+#include "h263.h"
+#include "mpeg4video.h"
+
+//The uni_DCtab_* tables below contain unified bits+length tables to encode DC
+//differences in mpeg4. Unified in the sense that the specification specifies
+//this encoding in several steps.
+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];
+
+//unified encoding tables for run length encoding of coefficients
+//unified in the sense that the specification specifies the encoding in several steps.
+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))
+//#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run) + (level)*64)
+#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run)*128 + (level))
+
+/* mpeg4
+inter
+max level: 24/6
+max run: 53/63
+
+intra
+max level: 53/16
+max run: 29/41
+*/
+
+
+/**
+ * Returns the number of bits that encoding the 8x8 block in block would need.
+ * @param[in]  block_last_index last index in scantable order that refers to a non zero element in block.
+ */
+static inline int get_block_rate(MpegEncContext * s, DCTELEM block[64], int block_last_index, uint8_t scantable[64]){
+    int last=0;
+    int j;
+    int rate=0;
+
+    for(j=1; j<=block_last_index; j++){
+        const int index= scantable[j];
+        int level= block[index];
+        if(level){
+            level+= 64;
+            if((level&(~127)) == 0){
+                if(j<block_last_index) rate+= s->intra_ac_vlc_length     [UNI_AC_ENC_INDEX(j-last-1, level)];
+                else                   rate+= s->intra_ac_vlc_last_length[UNI_AC_ENC_INDEX(j-last-1, level)];
+            }else
+                rate += s->ac_esc_length;
+
+            last= j;
+        }
+    }
+
+    return rate;
+}
+
+
+/**
+ * Restores the ac coefficients in block that have been changed by decide_ac_pred().
+ * This function also restores s->block_last_index.
+ * @param[in,out] block MB coefficients, these will be restored
+ * @param[in] dir ac prediction direction for each 8x8 block
+ * @param[out] st scantable for each 8x8 block
+ * @param[in] zigzag_last_index index refering to the last non zero coefficient in zigzag order
+ */
+static inline void restore_ac_coeffs(MpegEncContext * s, DCTELEM block[6][64], const int dir[6], uint8_t *st[6], const int zigzag_last_index[6])
+{
+    int i, n;
+    memcpy(s->block_last_index, zigzag_last_index, sizeof(int)*6);
+
+    for(n=0; n<6; n++){
+        int16_t *ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
+
+        st[n]= s->intra_scantable.permutated;
+        if(dir[n]){
+            /* top prediction */
+            for(i=1; i<8; i++){
+                block[n][s->dsp.idct_permutation[i   ]] = ac_val[i+8];
+            }
+        }else{
+            /* left prediction */
+            for(i=1; i<8; i++){
+                block[n][s->dsp.idct_permutation[i<<3]]= ac_val[i  ];
+            }
+        }
+    }
+}
+
+/**
+ * Returns the optimal value (0 or 1) for the ac_pred element for the given MB in mpeg4.
+ * This function will also update s->block_last_index and s->ac_val.
+ * @param[in,out] block MB coefficients, these will be updated if 1 is returned
+ * @param[in] dir ac prediction direction for each 8x8 block
+ * @param[out] st scantable for each 8x8 block
+ * @param[out] zigzag_last_index index refering to the last non zero coefficient in zigzag order
+ */
+static inline int decide_ac_pred(MpegEncContext * s, DCTELEM block[6][64], const int dir[6], uint8_t *st[6], int zigzag_last_index[6])
+{
+    int score= 0;
+    int i, n;
+    int8_t * const qscale_table= s->current_picture.qscale_table;
+
+    memcpy(zigzag_last_index, s->block_last_index, sizeof(int)*6);
+
+    for(n=0; n<6; n++){
+        int16_t *ac_val, *ac_val1;
+
+        score -= get_block_rate(s, block[n], s->block_last_index[n], s->intra_scantable.permutated);
+
+        ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
+        ac_val1= ac_val;
+        if(dir[n]){
+            const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride;
+            /* top prediction */
+            ac_val-= s->block_wrap[n]*16;
+            if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){
+                /* same qscale */
+                for(i=1; i<8; i++){
+                    const int level= block[n][s->dsp.idct_permutation[i   ]];
+                    block[n][s->dsp.idct_permutation[i   ]] = level - ac_val[i+8];
+                    ac_val1[i  ]=    block[n][s->dsp.idct_permutation[i<<3]];
+                    ac_val1[i+8]= level;
+                }
+            }else{
+                /* different qscale, we must rescale */
+                for(i=1; i<8; i++){
+                    const int level= block[n][s->dsp.idct_permutation[i   ]];
+                    block[n][s->dsp.idct_permutation[i   ]] = level - ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale);
+                    ac_val1[i  ]=    block[n][s->dsp.idct_permutation[i<<3]];
+                    ac_val1[i+8]= level;
+                }
+            }
+            st[n]= s->intra_h_scantable.permutated;
+        }else{
+            const int xy= s->mb_x-1 + s->mb_y*s->mb_stride;
+            /* left prediction */
+            ac_val-= 16;
+            if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){
+                /* same qscale */
+                for(i=1; i<8; i++){
+                    const int level= block[n][s->dsp.idct_permutation[i<<3]];
+                    block[n][s->dsp.idct_permutation[i<<3]]= level - ac_val[i];
+                    ac_val1[i  ]= level;
+                    ac_val1[i+8]=    block[n][s->dsp.idct_permutation[i   ]];
+                }
+            }else{
+                /* different qscale, we must rescale */
+                for(i=1; i<8; i++){
+                    const int level= block[n][s->dsp.idct_permutation[i<<3]];
+                    block[n][s->dsp.idct_permutation[i<<3]]= level - ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale);
+                    ac_val1[i  ]= level;
+                    ac_val1[i+8]=    block[n][s->dsp.idct_permutation[i   ]];
+                }
+            }
+            st[n]= s->intra_v_scantable.permutated;
+        }
+
+        for(i=63; i>0; i--) //FIXME optimize
+            if(block[n][ st[n][i] ]) break;
+        s->block_last_index[n]= i;
+
+        score += get_block_rate(s, block[n], s->block_last_index[n], st[n]);
+    }
+
+    if(score < 0){
+        return 1;
+    }else{
+        restore_ac_coeffs(s, block, dir, st, zigzag_last_index);
+        return 0;
+    }
+}
+
+/**
+ * modify mb_type & qscale so that encoding is acually possible in mpeg4
+ */
+void ff_clean_mpeg4_qscales(MpegEncContext *s){
+    int i;
+    int8_t * const qscale_table= s->current_picture.qscale_table;
+
+    ff_clean_h263_qscales(s);
+
+    if(s->pict_type== FF_B_TYPE){
+        int odd=0;
+        /* ok, come on, this isn't funny anymore, there's more code for handling this mpeg4 mess than for the actual adaptive quantization */
+
+        for(i=0; i<s->mb_num; i++){
+            int mb_xy= s->mb_index2xy[i];
+            odd += qscale_table[mb_xy]&1;
+        }
+
+        if(2*odd > s->mb_num) odd=1;
+        else                  odd=0;
+
+        for(i=0; i<s->mb_num; i++){
+            int mb_xy= s->mb_index2xy[i];
+            if((qscale_table[mb_xy]&1) != odd)
+                qscale_table[mb_xy]++;
+            if(qscale_table[mb_xy] > 31)
+                qscale_table[mb_xy]= 31;
+        }
+
+        for(i=1; i<s->mb_num; i++){
+            int mb_xy= s->mb_index2xy[i];
+            if(qscale_table[mb_xy] != qscale_table[s->mb_index2xy[i-1]] && (s->mb_type[mb_xy]&CANDIDATE_MB_TYPE_DIRECT)){
+                s->mb_type[mb_xy]|= CANDIDATE_MB_TYPE_BIDIR;
+            }
+        }
+    }
+}
+
+
+/**
+ * encodes the dc value.
+ * @param n block index (0-3 are luma, 4-5 are chroma)
+ */
+static inline void mpeg4_encode_dc(PutBitContext * s, int level, int n)
+{
+#if 1
+    level+=256;
+    if (n < 4) {
+        /* luminance */
+        put_bits(s, uni_DCtab_lum_len[level], uni_DCtab_lum_bits[level]);
+    } else {
+        /* chrominance */
+        put_bits(s, uni_DCtab_chrom_len[level], uni_DCtab_chrom_bits[level]);
+    }
+#else
+    int size, v;
+    /* find number of bits */
+    size = 0;
+    v = abs(level);
+    while (v) {
+        v >>= 1;
+        size++;
+    }
+
+    if (n < 4) {
+        /* luminance */
+        put_bits(&s->pb, DCtab_lum[size][1], DCtab_lum[size][0]);
+    } else {
+        /* chrominance */
+        put_bits(&s->pb, DCtab_chrom[size][1], DCtab_chrom[size][0]);
+    }
+
+    /* encode remaining bits */
+    if (size > 0) {
+        if (level < 0)
+            level = (-level) ^ ((1 << size) - 1);
+        put_bits(&s->pb, size, level);
+        if (size > 8)
+            put_bits(&s->pb, 1, 1);
+    }
+#endif
+}
+
+static inline int mpeg4_get_dc_length(int level, int n){
+    if (n < 4) {
+        return uni_DCtab_lum_len[level + 256];
+    } else {
+        return uni_DCtab_chrom_len[level + 256];
+    }
+}
+
+/**
+ * encodes a 8x8 block
+ * @param n block index (0-3 are luma, 4-5 are chroma)
+ */
+static inline void mpeg4_encode_block(MpegEncContext * s, DCTELEM * block, int n, int intra_dc,
+                               uint8_t *scan_table, PutBitContext *dc_pb, PutBitContext *ac_pb)
+{
+    int i, last_non_zero;
+#if 0 //variables for the outcommented version
+    int code, sign, last;
+#endif
+    const RLTable *rl;
+    uint32_t *bits_tab;
+    uint8_t *len_tab;
+    const int last_index = s->block_last_index[n];
+
+    if (s->mb_intra) { //Note gcc (3.2.1 at least) will optimize this away
+        /* mpeg4 based DC predictor */
+        mpeg4_encode_dc(dc_pb, intra_dc, n);
+        if(last_index<1) return;
+        i = 1;
+        rl = &rl_intra;
+        bits_tab= uni_mpeg4_intra_rl_bits;
+        len_tab = uni_mpeg4_intra_rl_len;
+    } else {
+        if(last_index<0) return;
+        i = 0;
+        rl = &rl_inter;
+        bits_tab= uni_mpeg4_inter_rl_bits;
+        len_tab = uni_mpeg4_inter_rl_len;
+    }
+
+    /* AC coefs */
+    last_non_zero = i - 1;
+#if 1
+    for (; i < last_index; i++) {
+        int level = block[ scan_table[i] ];
+        if (level) {
+            int run = i - last_non_zero - 1;
+            level+=64;
+            if((level&(~127)) == 0){
+                const int index= UNI_MPEG4_ENC_INDEX(0, run, level);
+                put_bits(ac_pb, len_tab[index], bits_tab[index]);
+            }else{ //ESC3
+                put_bits(ac_pb, 7+2+1+6+1+12+1, (3<<23)+(3<<21)+(0<<20)+(run<<14)+(1<<13)+(((level-64)&0xfff)<<1)+1);
+            }
+            last_non_zero = i;
+        }
+    }
+    /*if(i<=last_index)*/{
+        int level = block[ scan_table[i] ];
+        int run = i - last_non_zero - 1;
+        level+=64;
+        if((level&(~127)) == 0){
+            const int index= UNI_MPEG4_ENC_INDEX(1, run, level);
+            put_bits(ac_pb, len_tab[index], bits_tab[index]);
+        }else{ //ESC3
+            put_bits(ac_pb, 7+2+1+6+1+12+1, (3<<23)+(3<<21)+(1<<20)+(run<<14)+(1<<13)+(((level-64)&0xfff)<<1)+1);
+        }
+    }
+#else
+    for (; i <= last_index; i++) {
+        const int slevel = block[ scan_table[i] ];
+        if (slevel) {
+            int level;
+            int run = i - last_non_zero - 1;
+            last = (i == last_index);
+            sign = 0;
+            level = slevel;
+            if (level < 0) {
+                sign = 1;
+                level = -level;
+            }
+            code = get_rl_index(rl, last, run, level);
+            put_bits(ac_pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
+            if (code == rl->n) {
+                int level1, run1;
+                level1 = level - rl->max_level[last][run];
+                if (level1 < 1)
+                    goto esc2;
+                code = get_rl_index(rl, last, run, level1);
+                if (code == rl->n) {
+                esc2:
+                    put_bits(ac_pb, 1, 1);
+                    if (level > MAX_LEVEL)
+                        goto esc3;
+                    run1 = run - rl->max_run[last][level] - 1;
+                    if (run1 < 0)
+                        goto esc3;
+                    code = get_rl_index(rl, last, run1, level);
+                    if (code == rl->n) {
+                    esc3:
+                        /* third escape */
+                        put_bits(ac_pb, 1, 1);
+                        put_bits(ac_pb, 1, last);
+                        put_bits(ac_pb, 6, run);
+                        put_bits(ac_pb, 1, 1);
+                        put_sbits(ac_pb, 12, slevel);
+                        put_bits(ac_pb, 1, 1);
+                    } else {
+                        /* second escape */
+                        put_bits(ac_pb, 1, 0);
+                        put_bits(ac_pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
+                        put_bits(ac_pb, 1, sign);
+                    }
+                } else {
+                    /* first escape */
+                    put_bits(ac_pb, 1, 0);
+                    put_bits(ac_pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
+                    put_bits(ac_pb, 1, sign);
+                }
+            } else {
+                put_bits(ac_pb, 1, sign);
+            }
+            last_non_zero = i;
+        }
+    }
+#endif
+}
+
+static int mpeg4_get_block_length(MpegEncContext * s, DCTELEM * block, int n, int intra_dc,
+                               uint8_t *scan_table)
+{
+    int i, last_non_zero;
+    uint8_t *len_tab;
+    const int last_index = s->block_last_index[n];
+    int len=0;
+
+    if (s->mb_intra) { //Note gcc (3.2.1 at least) will optimize this away
+        /* mpeg4 based DC predictor */
+        len += mpeg4_get_dc_length(intra_dc, n);
+        if(last_index<1) return len;
+        i = 1;
+        len_tab = uni_mpeg4_intra_rl_len;
+    } else {
+        if(last_index<0) return 0;
+        i = 0;
+        len_tab = uni_mpeg4_inter_rl_len;
+    }
+
+    /* AC coefs */
+    last_non_zero = i - 1;
+    for (; i < last_index; i++) {
+        int level = block[ scan_table[i] ];
+        if (level) {
+            int run = i - last_non_zero - 1;
+            level+=64;
+            if((level&(~127)) == 0){
+                const int index= UNI_MPEG4_ENC_INDEX(0, run, level);
+                len += len_tab[index];
+            }else{ //ESC3
+                len += 7+2+1+6+1+12+1;
+            }
+            last_non_zero = i;
+        }
+    }
+    /*if(i<=last_index)*/{
+        int level = block[ scan_table[i] ];
+        int run = i - last_non_zero - 1;
+        level+=64;
+        if((level&(~127)) == 0){
+            const int index= UNI_MPEG4_ENC_INDEX(1, run, level);
+            len += len_tab[index];
+        }else{ //ESC3
+            len += 7+2+1+6+1+12+1;
+        }
+    }
+
+    return len;
+}
+
+static inline void mpeg4_encode_blocks(MpegEncContext * s, DCTELEM block[6][64], int intra_dc[6],
+                               uint8_t **scan_table, PutBitContext *dc_pb, PutBitContext *ac_pb){
+    int i;
+
+    if(scan_table){
+        if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
+            for (i = 0; i < 6; i++) {
+                skip_put_bits(&s->pb, mpeg4_get_block_length(s, block[i], i, intra_dc[i], scan_table[i]));
+            }
+        }else{
+            /* encode each block */
+            for (i = 0; i < 6; i++) {
+                mpeg4_encode_block(s, block[i], i, intra_dc[i], scan_table[i], dc_pb, ac_pb);
+            }
+        }
+    }else{
+        if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
+            for (i = 0; i < 6; i++) {
+                skip_put_bits(&s->pb, mpeg4_get_block_length(s, block[i], i, 0, s->intra_scantable.permutated));
+            }
+        }else{
+            /* encode each block */
+            for (i = 0; i < 6; i++) {
+                mpeg4_encode_block(s, block[i], i, 0, s->intra_scantable.permutated, dc_pb, ac_pb);
+            }
+        }
+    }
+}
+
+//FIXME this is duplicated to h263.c
+static const int dquant_code[5]= {1,0,9,2,3};
+
+void mpeg4_encode_mb(MpegEncContext * s,
+                    DCTELEM block[6][64],
+                    int motion_x, int motion_y)
+{
+    int cbpc, cbpy, pred_x, pred_y;
+    PutBitContext * const pb2    = s->data_partitioning                         ? &s->pb2    : &s->pb;
+    PutBitContext * const tex_pb = s->data_partitioning && s->pict_type!=FF_B_TYPE ? &s->tex_pb : &s->pb;
+    PutBitContext * const dc_pb  = s->data_partitioning && s->pict_type!=FF_I_TYPE ? &s->pb2    : &s->pb;
+    const int interleaved_stats= (s->flags&CODEC_FLAG_PASS1) && !s->data_partitioning ? 1 : 0;
+
+    if (!s->mb_intra) {
+        int i, cbp;
+
+        if(s->pict_type==FF_B_TYPE){
+            static const int mb_type_table[8]= {-1, 3, 2, 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){
+                for(i=0; i<2; i++){
+                    s->last_mv[i][0][0]=
+                    s->last_mv[i][0][1]=
+                    s->last_mv[i][1][0]=
+                    s->last_mv[i][1][1]= 0;
+                }
+            }
+
+            assert(s->dquant>=-2 && s->dquant<=2);
+            assert((s->dquant&1)==0);
+            assert(mb_type>=0);
+
+            /* nothing to do if this MB was skipped in the next P Frame */
+            if(s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]){ //FIXME avoid DCT & ...
+                s->skip_count++;
+                s->mv[0][0][0]=
+                s->mv[0][0][1]=
+                s->mv[1][0][0]=
+                s->mv[1][0][1]= 0;
+                s->mv_dir= MV_DIR_FORWARD; //doesn't matter
+                s->qscale -= s->dquant;
+//                s->mb_skipped=1;
+
+                return;
+            }
+
+            cbp= get_b_cbp(s, block, motion_x, motion_y, mb_type);
+
+            if ((cbp | motion_x | motion_y | mb_type) ==0) {
+                /* direct MB with MV={0,0} */
+                assert(s->dquant==0);
+
+                put_bits(&s->pb, 1, 1); /* mb not coded modb1=1 */
+
+                if(interleaved_stats){
+                    s->misc_bits++;
+                    s->last_bits++;
+                }
+                s->skip_count++;
+                return;
+            }
+
+            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 don't need it :)
+            if(cbp) put_bits(&s->pb, 6, cbp);
+
+            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;
+
+            if(!s->progressive_sequence){
+                if(cbp)
+                    put_bits(&s->pb, 1, s->interlaced_dct);
+                if(mb_type) // not direct mode
+                    put_bits(&s->pb, 1, s->mv_type == MV_TYPE_FIELD);
+            }
+
+            if(interleaved_stats){
+                s->misc_bits+= get_bits_diff(s);
+            }
+
+            if(mb_type == 0){
+                assert(s->mv_dir & MV_DIRECT);
+                ff_h263_encode_motion_vector(s, motion_x, motion_y, 1);
+                s->b_count++;
+                s->f_count++;
+            }else{
+                assert(mb_type > 0 && mb_type < 4);
+                if(s->mv_type != MV_TYPE_FIELD){
+                    if(s->mv_dir & MV_DIR_FORWARD){
+                        ff_h263_encode_motion_vector(s, s->mv[0][0][0] - s->last_mv[0][0][0],
+                                                        s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
+                        s->last_mv[0][0][0]= s->last_mv[0][1][0]= s->mv[0][0][0];
+                        s->last_mv[0][0][1]= s->last_mv[0][1][1]= s->mv[0][0][1];
+                        s->f_count++;
+                    }
+                    if(s->mv_dir & MV_DIR_BACKWARD){
+                        ff_h263_encode_motion_vector(s, s->mv[1][0][0] - s->last_mv[1][0][0],
+                                                        s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
+                        s->last_mv[1][0][0]= s->last_mv[1][1][0]= s->mv[1][0][0];
+                        s->last_mv[1][0][1]= s->last_mv[1][1][1]= s->mv[1][0][1];
+                        s->b_count++;
+                    }
+                }else{
+                    if(s->mv_dir & MV_DIR_FORWARD){
+                        put_bits(&s->pb, 1, s->field_select[0][0]);
+                        put_bits(&s->pb, 1, s->field_select[0][1]);
+                    }
+                    if(s->mv_dir & MV_DIR_BACKWARD){
+                        put_bits(&s->pb, 1, s->field_select[1][0]);
+                        put_bits(&s->pb, 1, s->field_select[1][1]);
+                    }
+                    if(s->mv_dir & MV_DIR_FORWARD){
+                        for(i=0; i<2; i++){
+                            ff_h263_encode_motion_vector(s, s->mv[0][i][0] - s->last_mv[0][i][0]  ,
+                                                            s->mv[0][i][1] - s->last_mv[0][i][1]/2, s->f_code);
+                            s->last_mv[0][i][0]= s->mv[0][i][0];
+                            s->last_mv[0][i][1]= s->mv[0][i][1]*2;
+                        }
+                        s->f_count++;
+                    }
+                    if(s->mv_dir & MV_DIR_BACKWARD){
+                        for(i=0; i<2; i++){
+                            ff_h263_encode_motion_vector(s, s->mv[1][i][0] - s->last_mv[1][i][0]  ,
+                                                            s->mv[1][i][1] - s->last_mv[1][i][1]/2, s->b_code);
+                            s->last_mv[1][i][0]= s->mv[1][i][0];
+                            s->last_mv[1][i][1]= s->mv[1][i][1]*2;
+                        }
+                        s->b_count++;
+                    }
+                }
+            }
+
+            if(interleaved_stats){
+                s->mv_bits+= get_bits_diff(s);
+            }
+
+            mpeg4_encode_blocks(s, block, NULL, NULL, NULL, &s->pb);
+
+            if(interleaved_stats){
+                s->p_tex_bits+= get_bits_diff(s);
+            }
+
+        }else{ /* s->pict_type==FF_B_TYPE */
+            cbp= get_p_cbp(s, block, motion_x, motion_y);
+
+            if ((cbp | motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16) {
+                /* check if the B frames can skip it too, as we must skip it if we skip here
+                   why didn't they just compress the skip-mb bits instead of reusing them ?! */
+                if(s->max_b_frames>0){
+                    int i;
+                    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;
+                    p_pic= s->new_picture.data[0] + offset;
+
+                    s->mb_skipped=1;
+                    for(i=0; i<s->max_b_frames; i++){
+                        uint8_t *b_pic;
+                        int diff;
+                        Picture *pic= s->reordered_input_picture[i+1];
+
+                        if(pic==NULL || pic->pict_type!=FF_B_TYPE) break;
+
+                        b_pic= pic->data[0] + offset;
+                        if(pic->type != FF_BUFFER_TYPE_SHARED)
+                            b_pic+= INPLACE_OFFSET;
+                        diff= s->dsp.sad[0](NULL, p_pic, b_pic, s->linesize, 16);
+                        if(diff>s->qscale*70){ //FIXME check that 70 is optimal
+                            s->mb_skipped=0;
+                            break;
+                        }
+                    }
+                }else
+                    s->mb_skipped=1;
+
+                if(s->mb_skipped==1){
+                    /* skip macroblock */
+                    put_bits(&s->pb, 1, 1);
+
+                    if(interleaved_stats){
+                        s->misc_bits++;
+                        s->last_bits++;
+                    }
+                    s->skip_count++;
+
+                    return;
+                }
+            }
+
+            put_bits(&s->pb, 1, 0);     /* mb coded */
+            cbpc = cbp & 3;
+            cbpy = cbp >> 2;
+            cbpy ^= 0xf;
+            if(s->mv_type==MV_TYPE_16X16){
+                if(s->dquant) cbpc+= 8;
+                put_bits(&s->pb,
+                        inter_MCBPC_bits[cbpc],
+                        inter_MCBPC_code[cbpc]);
+
+                put_bits(pb2, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
+                if(s->dquant)
+                    put_bits(pb2, 2, dquant_code[s->dquant+2]);
+
+                if(!s->progressive_sequence){
+                    if(cbp)
+                        put_bits(pb2, 1, s->interlaced_dct);
+                    put_bits(pb2, 1, 0);
+                }
+
+                if(interleaved_stats){
+                    s->misc_bits+= get_bits_diff(s);
+                }
+
+                /* motion vectors: 16x16 mode */
+                h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
+
+                ff_h263_encode_motion_vector(s, motion_x - pred_x,
+                                                motion_y - pred_y, s->f_code);
+            }else if(s->mv_type==MV_TYPE_FIELD){
+                if(s->dquant) cbpc+= 8;
+                put_bits(&s->pb,
+                        inter_MCBPC_bits[cbpc],
+                        inter_MCBPC_code[cbpc]);
+
+                put_bits(pb2, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
+                if(s->dquant)
+                    put_bits(pb2, 2, dquant_code[s->dquant+2]);
+
+                assert(!s->progressive_sequence);
+                if(cbp)
+                    put_bits(pb2, 1, s->interlaced_dct);
+                put_bits(pb2, 1, 1);
+
+                if(interleaved_stats){
+                    s->misc_bits+= get_bits_diff(s);
+                }
+
+                /* motion vectors: 16x8 interlaced mode */
+                h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
+                pred_y /=2;
+
+                put_bits(&s->pb, 1, s->field_select[0][0]);
+                put_bits(&s->pb, 1, s->field_select[0][1]);
+
+                ff_h263_encode_motion_vector(s, s->mv[0][0][0] - pred_x,
+                                                s->mv[0][0][1] - pred_y, s->f_code);
+                ff_h263_encode_motion_vector(s, s->mv[0][1][0] - pred_x,
+                                                s->mv[0][1][1] - pred_y, s->f_code);
+            }else{
+                assert(s->mv_type==MV_TYPE_8X8);
+                put_bits(&s->pb,
+                        inter_MCBPC_bits[cbpc+16],
+                        inter_MCBPC_code[cbpc+16]);
+                put_bits(pb2, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
+
+                if(!s->progressive_sequence){
+                    if(cbp)
+                        put_bits(pb2, 1, s->interlaced_dct);
+                }
+
+                if(interleaved_stats){
+                    s->misc_bits+= get_bits_diff(s);
+                }
+
+                for(i=0; i<4; i++){
+                    /* motion vectors: 8x8 mode*/
+                    h263_pred_motion(s, i, 0, &pred_x, &pred_y);
+
+                    ff_h263_encode_motion_vector(s, s->current_picture.motion_val[0][ s->block_index[i] ][0] - pred_x,
+                                                    s->current_picture.motion_val[0][ s->block_index[i] ][1] - pred_y, s->f_code);
+                }
+            }
+
+            if(interleaved_stats){
+                s->mv_bits+= get_bits_diff(s);
+            }
+
+            mpeg4_encode_blocks(s, block, NULL, NULL, NULL, tex_pb);
+
+            if(interleaved_stats){
+                s->p_tex_bits+= get_bits_diff(s);
+            }
+            s->f_count++;
+        }
+    } else {
+        int cbp;
+        int dc_diff[6];   //dc values with the dc prediction subtracted
+        int dir[6];  //prediction direction
+        int zigzag_last_index[6];
+        uint8_t *scan_table[6];
+        int i;
+
+        for(i=0; i<6; i++){
+            dc_diff[i]= ff_mpeg4_pred_dc(s, i, block[i][0], &dir[i], 1);
+        }
+
+        if(s->flags & CODEC_FLAG_AC_PRED){
+            s->ac_pred= decide_ac_pred(s, block, dir, scan_table, zigzag_last_index);
+        }else{
+            for(i=0; i<6; i++)
+                scan_table[i]= s->intra_scantable.permutated;
+        }
+
+        /* 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 == FF_I_TYPE) {
+            if(s->dquant) cbpc+=4;
+            put_bits(&s->pb,
+                intra_MCBPC_bits[cbpc],
+                intra_MCBPC_code[cbpc]);
+        } else {
+            if(s->dquant) cbpc+=8;
+            put_bits(&s->pb, 1, 0);     /* mb coded */
+            put_bits(&s->pb,
+                inter_MCBPC_bits[cbpc + 4],
+                inter_MCBPC_code[cbpc + 4]);
+        }
+        put_bits(pb2, 1, s->ac_pred);
+        cbpy = cbp >> 2;
+        put_bits(pb2, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
+        if(s->dquant)
+            put_bits(dc_pb, 2, dquant_code[s->dquant+2]);
+
+        if(!s->progressive_sequence){
+            put_bits(dc_pb, 1, s->interlaced_dct);
+        }
+
+        if(interleaved_stats){
+            s->misc_bits+= get_bits_diff(s);
+        }
+
+        mpeg4_encode_blocks(s, block, dc_diff, scan_table, dc_pb, tex_pb);
+
+        if(interleaved_stats){
+            s->i_tex_bits+= get_bits_diff(s);
+        }
+        s->i_count++;
+
+        /* restore ac coeffs & last_index stuff if we messed them up with the prediction */
+        if(s->ac_pred)
+            restore_ac_coeffs(s, block, dir, scan_table, zigzag_last_index);
+    }
+}
+
+/**
+ * add mpeg4 stuffing bits (01...1)
+ */
+void ff_mpeg4_stuffing(PutBitContext * pbc)
+{
+    int length;
+    put_bits(pbc, 1, 0);
+    length= (-put_bits_count(pbc))&7;
+    if(length) put_bits(pbc, length, (1<<length)-1);
+}
+
+/* must be called before writing the header */
+void ff_set_mpeg4_time(MpegEncContext * s){
+    if(s->pict_type==FF_B_TYPE){
+        ff_mpeg4_init_direct_mv(s);
+    }else{
+        s->last_time_base= s->time_base;
+        s->time_base= s->time/s->avctx->time_base.den;
+    }
+}
+
+static void mpeg4_encode_gop_header(MpegEncContext * s){
+    int hours, minutes, seconds;
+    int64_t time;
+
+    put_bits(&s->pb, 16, 0);
+    put_bits(&s->pb, 16, GOP_STARTCODE);
+
+    time= s->current_picture_ptr->pts;
+    if(s->reordered_input_picture[1])
+        time= FFMIN(time, s->reordered_input_picture[1]->pts);
+    time= time*s->avctx->time_base.num;
+
+    seconds= time/s->avctx->time_base.den;
+    minutes= seconds/60; seconds %= 60;
+    hours= minutes/60; minutes %= 60;
+    hours%=24;
+
+    put_bits(&s->pb, 5, hours);
+    put_bits(&s->pb, 6, minutes);
+    put_bits(&s->pb, 1, 1);
+    put_bits(&s->pb, 6, seconds);
+
+    put_bits(&s->pb, 1, !!(s->flags&CODEC_FLAG_CLOSED_GOP));
+    put_bits(&s->pb, 1, 0); //broken link == NO
+
+    s->last_time_base= time / s->avctx->time_base.den;
+
+    ff_mpeg4_stuffing(&s->pb);
+}
+
+static void mpeg4_encode_visual_object_header(MpegEncContext * s){
+    int profile_and_level_indication;
+    int vo_ver_id;
+
+    if(s->avctx->profile != FF_PROFILE_UNKNOWN){
+        profile_and_level_indication = s->avctx->profile << 4;
+    }else if(s->max_b_frames || s->quarter_sample){
+        profile_and_level_indication= 0xF0; // adv simple
+    }else{
+        profile_and_level_indication= 0x00; // simple
+    }
+
+    if(s->avctx->level != FF_LEVEL_UNKNOWN){
+        profile_and_level_indication |= s->avctx->level;
+    }else{
+        profile_and_level_indication |= 1; //level 1
+    }
+
+    if(profile_and_level_indication>>4 == 0xF){
+        vo_ver_id= 5;
+    }else{
+        vo_ver_id= 1;
+    }
+
+    //FIXME levels
+
+    put_bits(&s->pb, 16, 0);
+    put_bits(&s->pb, 16, VOS_STARTCODE);
+
+    put_bits(&s->pb, 8, profile_and_level_indication);
+
+    put_bits(&s->pb, 16, 0);
+    put_bits(&s->pb, 16, VISUAL_OBJ_STARTCODE);
+
+    put_bits(&s->pb, 1, 1);
+        put_bits(&s->pb, 4, vo_ver_id);
+        put_bits(&s->pb, 3, 1); //priority
+
+    put_bits(&s->pb, 4, 1); //visual obj type== video obj
+
+    put_bits(&s->pb, 1, 0); //video signal type == no clue //FIXME
+
+    ff_mpeg4_stuffing(&s->pb);
+}
+
+static void mpeg4_encode_vol_header(MpegEncContext * s, int vo_number, int vol_number)
+{
+    int vo_ver_id;
+
+    if (!CONFIG_MPEG4_ENCODER)  return;
+
+    if(s->max_b_frames || s->quarter_sample){
+        vo_ver_id= 5;
+        s->vo_type= ADV_SIMPLE_VO_TYPE;
+    }else{
+        vo_ver_id= 1;
+        s->vo_type= SIMPLE_VO_TYPE;
+    }
+
+    put_bits(&s->pb, 16, 0);
+    put_bits(&s->pb, 16, 0x100 + vo_number);        /* video obj */
+    put_bits(&s->pb, 16, 0);
+    put_bits(&s->pb, 16, 0x120 + vol_number);       /* video obj layer */
+
+    put_bits(&s->pb, 1, 0);             /* random access vol */
+    put_bits(&s->pb, 8, s->vo_type);    /* video obj type indication */
+    if(s->workaround_bugs & FF_BUG_MS) {
+        put_bits(&s->pb, 1, 0);         /* is obj layer id= no */
+    } else {
+        put_bits(&s->pb, 1, 1);         /* is obj layer id= yes */
+        put_bits(&s->pb, 4, vo_ver_id); /* is obj layer ver id */
+        put_bits(&s->pb, 3, 1);         /* is obj layer priority */
+    }
+
+    s->aspect_ratio_info= ff_h263_aspect_to_info(s->avctx->sample_aspect_ratio);
+
+    put_bits(&s->pb, 4, s->aspect_ratio_info);/* aspect ratio info */
+    if (s->aspect_ratio_info == FF_ASPECT_EXTENDED){
+        put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.num);
+        put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.den);
+    }
+
+    if(s->workaround_bugs & FF_BUG_MS) { //
+        put_bits(&s->pb, 1, 0);         /* vol control parameters= no @@@ */
+    } else {
+        put_bits(&s->pb, 1, 1);         /* vol control parameters= yes */
+        put_bits(&s->pb, 2, 1);         /* chroma format YUV 420/YV12 */
+        put_bits(&s->pb, 1, s->low_delay);
+        put_bits(&s->pb, 1, 0);         /* vbv parameters= no */
+    }
+
+    put_bits(&s->pb, 2, RECT_SHAPE);    /* vol shape= rectangle */
+    put_bits(&s->pb, 1, 1);             /* marker bit */
+
+    put_bits(&s->pb, 16, s->avctx->time_base.den);
+    if (s->time_increment_bits < 1)
+        s->time_increment_bits = 1;
+    put_bits(&s->pb, 1, 1);             /* marker bit */
+    put_bits(&s->pb, 1, 0);             /* fixed vop rate=no */
+    put_bits(&s->pb, 1, 1);             /* marker bit */
+    put_bits(&s->pb, 13, s->width);     /* vol width */
+    put_bits(&s->pb, 1, 1);             /* marker bit */
+    put_bits(&s->pb, 13, s->height);    /* vol height */
+    put_bits(&s->pb, 1, 1);             /* marker bit */
+    put_bits(&s->pb, 1, s->progressive_sequence ? 0 : 1);
+    put_bits(&s->pb, 1, 1);             /* obmc disable */
+    if (vo_ver_id == 1) {
+        put_bits(&s->pb, 1, s->vol_sprite_usage);       /* sprite enable */
+    }else{
+        put_bits(&s->pb, 2, s->vol_sprite_usage);       /* sprite enable */
+    }
+
+    put_bits(&s->pb, 1, 0);             /* not 8 bit == false */
+    put_bits(&s->pb, 1, s->mpeg_quant); /* quant type= (0=h263 style)*/
+
+    if(s->mpeg_quant){
+        ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix);
+        ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix);
+    }
+
+    if (vo_ver_id != 1)
+        put_bits(&s->pb, 1, s->quarter_sample);
+    put_bits(&s->pb, 1, 1);             /* complexity estimation disable */
+    s->resync_marker= s->rtp_mode;
+    put_bits(&s->pb, 1, s->resync_marker ? 0 : 1);/* resync marker disable */
+    put_bits(&s->pb, 1, s->data_partitioning ? 1 : 0);
+    if(s->data_partitioning){
+        put_bits(&s->pb, 1, 0);         /* no rvlc */
+    }
+
+    if (vo_ver_id != 1){
+        put_bits(&s->pb, 1, 0);         /* newpred */
+        put_bits(&s->pb, 1, 0);         /* reduced res vop */
+    }
+    put_bits(&s->pb, 1, 0);             /* scalability */
+
+    ff_mpeg4_stuffing(&s->pb);
+
+    /* user data */
+    if(!(s->flags & CODEC_FLAG_BITEXACT)){
+        put_bits(&s->pb, 16, 0);
+        put_bits(&s->pb, 16, 0x1B2);    /* user_data */
+        ff_put_string(&s->pb, LIBAVCODEC_IDENT, 0);
+    }
+}
+
+/* write mpeg4 VOP header */
+void mpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
+{
+    int time_incr;
+    int time_div, time_mod;
+
+    if(s->pict_type==FF_I_TYPE){
+        if(!(s->flags&CODEC_FLAG_GLOBAL_HEADER)){
+            if(s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT) //HACK, the reference sw is buggy
+                mpeg4_encode_visual_object_header(s);
+            if(s->strict_std_compliance < FF_COMPLIANCE_VERY_STRICT || picture_number==0) //HACK, the reference sw is buggy
+                mpeg4_encode_vol_header(s, 0, 0);
+        }
+        if(!(s->workaround_bugs & FF_BUG_MS))
+            mpeg4_encode_gop_header(s);
+    }
+
+    s->partitioned_frame= s->data_partitioning && s->pict_type!=FF_B_TYPE;
+
+    put_bits(&s->pb, 16, 0);                /* vop header */
+    put_bits(&s->pb, 16, VOP_STARTCODE);    /* vop header */
+    put_bits(&s->pb, 2, s->pict_type - 1);  /* pict type: I = 0 , P = 1 */
+
+    assert(s->time>=0);
+    time_div= s->time/s->avctx->time_base.den;
+    time_mod= s->time%s->avctx->time_base.den;
+    time_incr= time_div - s->last_time_base;
+    assert(time_incr >= 0);
+    while(time_incr--)
+        put_bits(&s->pb, 1, 1);
+
+    put_bits(&s->pb, 1, 0);
+
+    put_bits(&s->pb, 1, 1);                             /* marker */
+    put_bits(&s->pb, s->time_increment_bits, time_mod); /* time increment */
+    put_bits(&s->pb, 1, 1);                             /* marker */
+    put_bits(&s->pb, 1, 1);                             /* vop coded */
+    if (    s->pict_type == FF_P_TYPE
+        || (s->pict_type == FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE)) {
+        put_bits(&s->pb, 1, s->no_rounding);    /* rounding type */
+    }
+    put_bits(&s->pb, 3, 0);     /* intra dc VLC threshold */
+    if(!s->progressive_sequence){
+         put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first);
+         put_bits(&s->pb, 1, s->alternate_scan);
+    }
+    //FIXME sprite stuff
+
+    put_bits(&s->pb, 5, s->qscale);
+
+    if (s->pict_type != FF_I_TYPE)
+        put_bits(&s->pb, 3, s->f_code); /* fcode_for */
+    if (s->pict_type == FF_B_TYPE)
+        put_bits(&s->pb, 3, s->b_code); /* fcode_back */
+}
+
+
+static void init_uni_dc_tab(void)
+{
+    int level, uni_code, uni_len;
+
+    for(level=-256; level<256; level++){
+        int size, v, l;
+        /* find number of bits */
+        size = 0;
+        v = abs(level);
+        while (v) {
+            v >>= 1;
+            size++;
+        }
+
+        if (level < 0)
+            l= (-level) ^ ((1 << size) - 1);
+        else
+            l= level;
+
+        /* luminance */
+        uni_code= DCtab_lum[size][0];
+        uni_len = DCtab_lum[size][1];
+
+        if (size > 0) {
+            uni_code<<=size; uni_code|=l;
+            uni_len+=size;
+            if (size > 8){
+                uni_code<<=1; uni_code|=1;
+                uni_len++;
+            }
+        }
+        uni_DCtab_lum_bits[level+256]= uni_code;
+        uni_DCtab_lum_len [level+256]= uni_len;
+
+        /* chrominance */
+        uni_code= DCtab_chrom[size][0];
+        uni_len = DCtab_chrom[size][1];
+
+        if (size > 0) {
+            uni_code<<=size; uni_code|=l;
+            uni_len+=size;
+            if (size > 8){
+                uni_code<<=1; uni_code|=1;
+                uni_len++;
+            }
+        }
+        uni_DCtab_chrom_bits[level+256]= uni_code;
+        uni_DCtab_chrom_len [level+256]= uni_len;
+
+    }
+}
+
+static void init_uni_mpeg4_rl_tab(RLTable *rl, uint32_t *bits_tab, uint8_t *len_tab){
+    int slevel, run, last;
+
+    assert(MAX_LEVEL >= 64);
+    assert(MAX_RUN   >= 63);
+
+    for(slevel=-64; slevel<64; slevel++){
+        if(slevel==0) continue;
+        for(run=0; run<64; run++){
+            for(last=0; last<=1; last++){
+                const int index= UNI_MPEG4_ENC_INDEX(last, run, slevel+64);
+                int level= slevel < 0 ? -slevel : slevel;
+                int sign= slevel < 0 ? 1 : 0;
+                int bits, len, code;
+                int level1, run1;
+
+                len_tab[index]= 100;
+
+                /* ESC0 */
+                code= get_rl_index(rl, last, run, level);
+                bits= rl->table_vlc[code][0];
+                len=  rl->table_vlc[code][1];
+                bits=bits*2+sign; len++;
+
+                if(code!=rl->n && len < len_tab[index]){
+                    bits_tab[index]= bits;
+                    len_tab [index]= len;
+                }
+                /* ESC1 */
+                bits= rl->table_vlc[rl->n][0];
+                len=  rl->table_vlc[rl->n][1];
+                bits=bits*2;    len++; //esc1
+                level1= level - rl->max_level[last][run];
+                if(level1>0){
+                    code= get_rl_index(rl, last, run, level1);
+                    bits<<= rl->table_vlc[code][1];
+                    len  += rl->table_vlc[code][1];
+                    bits += rl->table_vlc[code][0];
+                    bits=bits*2+sign; len++;
+
+                    if(code!=rl->n && len < len_tab[index]){
+                        bits_tab[index]= bits;
+                        len_tab [index]= len;
+                    }
+                }
+                /* ESC2 */
+                bits= rl->table_vlc[rl->n][0];
+                len=  rl->table_vlc[rl->n][1];
+                bits=bits*4+2;    len+=2; //esc2
+                run1 = run - rl->max_run[last][level] - 1;
+                if(run1>=0){
+                    code= get_rl_index(rl, last, run1, level);
+                    bits<<= rl->table_vlc[code][1];
+                    len  += rl->table_vlc[code][1];
+                    bits += rl->table_vlc[code][0];
+                    bits=bits*2+sign; len++;
+
+                    if(code!=rl->n && len < len_tab[index]){
+                        bits_tab[index]= bits;
+                        len_tab [index]= len;
+                    }
+                }
+                /* ESC3 */
+                bits= rl->table_vlc[rl->n][0];
+                len = rl->table_vlc[rl->n][1];
+                bits=bits*4+3;    len+=2; //esc3
+                bits=bits*2+last; len++;
+                bits=bits*64+run; len+=6;
+                bits=bits*2+1;    len++;  //marker
+                bits=bits*4096+(slevel&0xfff); len+=12;
+                bits=bits*2+1;    len++;  //marker
+
+                if(len < len_tab[index]){
+                    bits_tab[index]= bits;
+                    len_tab [index]= len;
+                }
+            }
+        }
+    }
+}
+
+static av_cold int encode_init(AVCodecContext *avctx)
+{
+    MpegEncContext *s = avctx->priv_data;
+    int ret;
+    static int done = 0;
+
+    if((ret=MPV_encode_init(avctx)) < 0)
+        return ret;
+
+    if (!done) {
+        done = 1;
+
+        init_uni_dc_tab();
+
+        init_rl(&rl_intra, ff_mpeg4_static_rl_table_store[0]);
+
+        init_uni_mpeg4_rl_tab(&rl_intra, uni_mpeg4_intra_rl_bits, uni_mpeg4_intra_rl_len);
+        init_uni_mpeg4_rl_tab(&rl_inter, uni_mpeg4_inter_rl_bits, uni_mpeg4_inter_rl_len);
+    }
+
+    s->min_qcoeff= -2048;
+    s->max_qcoeff=  2047;
+    s->intra_ac_vlc_length     = uni_mpeg4_intra_rl_len;
+    s->intra_ac_vlc_last_length= uni_mpeg4_intra_rl_len + 128*64;
+    s->inter_ac_vlc_length     = uni_mpeg4_inter_rl_len;
+    s->inter_ac_vlc_last_length= uni_mpeg4_inter_rl_len + 128*64;
+    s->luma_dc_vlc_length= uni_DCtab_lum_len;
+    s->chroma_dc_vlc_length= uni_DCtab_chrom_len;
+    s->ac_esc_length= 7+2+1+6+1+12+1;
+    s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table;
+    s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
+
+    if(s->flags & CODEC_FLAG_GLOBAL_HEADER){
+
+        s->avctx->extradata= av_malloc(1024);
+        init_put_bits(&s->pb, s->avctx->extradata, 1024);
+
+        if(!(s->workaround_bugs & FF_BUG_MS))
+            mpeg4_encode_visual_object_header(s);
+        mpeg4_encode_vol_header(s, 0, 0);
+
+//            ff_mpeg4_stuffing(&s->pb); ?
+        flush_put_bits(&s->pb);
+        s->avctx->extradata_size= (put_bits_count(&s->pb)+7)>>3;
+    }
+    return 0;
+}
+
+void ff_mpeg4_init_partitions(MpegEncContext *s)
+{
+    uint8_t *start= put_bits_ptr(&s->pb);
+    uint8_t *end= s->pb.buf_end;
+    int size= end - start;
+    int pb_size = (((intptr_t)start + size/3)&(~3)) - (intptr_t)start;
+    int tex_size= (size - 2*pb_size)&(~3);
+
+    set_put_bits_buffer_size(&s->pb, pb_size);
+    init_put_bits(&s->tex_pb, start + pb_size           , tex_size);
+    init_put_bits(&s->pb2   , start + pb_size + tex_size, pb_size);
+}
+
+void ff_mpeg4_merge_partitions(MpegEncContext *s)
+{
+    const int pb2_len   = put_bits_count(&s->pb2   );
+    const int tex_pb_len= put_bits_count(&s->tex_pb);
+    const int bits= put_bits_count(&s->pb);
+
+    if(s->pict_type==FF_I_TYPE){
+        put_bits(&s->pb, 19, DC_MARKER);
+        s->misc_bits+=19 + pb2_len + bits - s->last_bits;
+        s->i_tex_bits+= tex_pb_len;
+    }else{
+        put_bits(&s->pb, 17, MOTION_MARKER);
+        s->misc_bits+=17 + pb2_len;
+        s->mv_bits+= bits - s->last_bits;
+        s->p_tex_bits+= tex_pb_len;
+    }
+
+    flush_put_bits(&s->pb2);
+    flush_put_bits(&s->tex_pb);
+
+    set_put_bits_buffer_size(&s->pb, s->pb2.buf_end - s->pb.buf);
+    ff_copy_bits(&s->pb, s->pb2.buf   , pb2_len);
+    ff_copy_bits(&s->pb, s->tex_pb.buf, tex_pb_len);
+    s->last_bits= put_bits_count(&s->pb);
+}
+
+
+void ff_mpeg4_encode_video_packet_header(MpegEncContext *s)
+{
+    int mb_num_bits= av_log2(s->mb_num - 1) + 1;
+
+    put_bits(&s->pb, ff_mpeg4_get_video_packet_prefix_length(s), 0);
+    put_bits(&s->pb, 1, 1);
+
+    put_bits(&s->pb, mb_num_bits, s->mb_x + s->mb_y*s->mb_width);
+    put_bits(&s->pb, s->quant_precision, s->qscale);
+    put_bits(&s->pb, 1, 0); /* no HEC */
+}
+
+AVCodec mpeg4_encoder = {
+    "mpeg4",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_MPEG4,
+    sizeof(MpegEncContext),
+    encode_init,
+    MPV_encode_picture,
+    MPV_encode_end,
+    .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
+    .capabilities= CODEC_CAP_DELAY,
+    .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
+};