msmpeg4: Split encoding backend code off from general backend code.

1 files changed, 692 insertions, 0 deletions

diff --git a/libavcodec/msmpeg4enc.c b/libavcodec/msmpeg4enc.c
new file mode 100644
index 0000000000..67490b53f6
--- /dev/null
+++ b/libavcodec/msmpeg4enc.c
@@ -0,0 +1,692 @@
+/*
+ * MSMPEG4 encoder backend
+ * Copyright (c) 2001 Fabrice Bellard
+ * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * msmpeg4v1 & v2 stuff by Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * MSMPEG4 encoder backend
+ */
+
+#include <stdint.h>
+#include <string.h>
+
+#include "libavutil/avutil.h"
+#include "libavutil/mem.h"
+#include "mpegvideo.h"
+#include "msmpeg4.h"
+#include "h263.h"
+#include "mpeg4video.h"
+#include "msmpeg4.h"
+#include "msmpeg4data.h"
+#include "put_bits.h"
+#include "rl.h"
+#include "vc1data.h"
+
+static uint8_t rl_length[NB_RL_TABLES][MAX_LEVEL+1][MAX_RUN+1][2];
+
+/* build the table which associate a (x,y) motion vector to a vlc */
+static void init_mv_table(MVTable *tab)
+{
+    int i, x, y;
+
+    tab->table_mv_index = av_malloc(sizeof(uint16_t) * 4096);
+    /* mark all entries as not used */
+    for(i=0;i<4096;i++)
+        tab->table_mv_index[i] = tab->n;
+
+    for(i=0;i<tab->n;i++) {
+        x = tab->table_mvx[i];
+        y = tab->table_mvy[i];
+        tab->table_mv_index[(x << 6) | y] = i;
+    }
+}
+
+void ff_msmpeg4_code012(PutBitContext *pb, int n)
+{
+    if (n == 0) {
+        put_bits(pb, 1, 0);
+    } else {
+        put_bits(pb, 1, 1);
+        put_bits(pb, 1, (n >= 2));
+    }
+}
+
+static int get_size_of_code(MpegEncContext * s, RLTable *rl, int last, int run, int level, int intra){
+    int size=0;
+    int code;
+    int run_diff= intra ? 0 : 1;
+
+    code = get_rl_index(rl, last, run, level);
+    size+= rl->table_vlc[code][1];
+    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:
+            size++;
+            if (level > MAX_LEVEL)
+                goto esc3;
+            run1 = run - rl->max_run[last][level] - run_diff;
+            if (run1 < 0)
+                goto esc3;
+            code = get_rl_index(rl, last, run1, level);
+            if (code == rl->n) {
+            esc3:
+                /* third escape */
+                size+=1+1+6+8;
+            } else {
+                /* second escape */
+                size+= 1+1+ rl->table_vlc[code][1];
+            }
+        } else {
+            /* first escape */
+            size+= 1+1+ rl->table_vlc[code][1];
+        }
+    } else {
+        size++;
+    }
+    return size;
+}
+
+av_cold void ff_msmpeg4_encode_init(MpegEncContext *s)
+{
+    static int init_done=0;
+    int i;
+
+    ff_msmpeg4_common_init(s);
+    if(s->msmpeg4_version>=4){
+        s->min_qcoeff= -255;
+        s->max_qcoeff=  255;
+    }
+
+    if (!init_done) {
+        /* init various encoding tables */
+        init_done = 1;
+        init_mv_table(&ff_mv_tables[0]);
+        init_mv_table(&ff_mv_tables[1]);
+        for(i=0;i<NB_RL_TABLES;i++)
+            ff_init_rl(&ff_rl_table[i], ff_static_rl_table_store[i]);
+
+        for(i=0; i<NB_RL_TABLES; i++){
+            int level;
+            for (level = 1; level <= MAX_LEVEL; level++) {
+                int run;
+                for(run=0; run<=MAX_RUN; run++){
+                    int last;
+                    for(last=0; last<2; last++){
+                        rl_length[i][level][run][last]= get_size_of_code(s, &ff_rl_table[  i], last, run, level, 0);
+                    }
+                }
+            }
+        }
+    }
+}
+
+static void find_best_tables(MpegEncContext * s)
+{
+    int i;
+    int best       =-1, best_size       =9999999;
+    int chroma_best=-1, best_chroma_size=9999999;
+
+    for(i=0; i<3; i++){
+        int level;
+        int chroma_size=0;
+        int size=0;
+
+        if(i>0){// ;)
+            size++;
+            chroma_size++;
+        }
+        for(level=0; level<=MAX_LEVEL; level++){
+            int run;
+            for(run=0; run<=MAX_RUN; run++){
+                int last;
+                const int last_size= size + chroma_size;
+                for(last=0; last<2; last++){
+                    int inter_count       = s->ac_stats[0][0][level][run][last] + s->ac_stats[0][1][level][run][last];
+                    int intra_luma_count  = s->ac_stats[1][0][level][run][last];
+                    int intra_chroma_count= s->ac_stats[1][1][level][run][last];
+
+                    if(s->pict_type==AV_PICTURE_TYPE_I){
+                        size       += intra_luma_count  *rl_length[i  ][level][run][last];
+                        chroma_size+= intra_chroma_count*rl_length[i+3][level][run][last];
+                    }else{
+                        size+=        intra_luma_count  *rl_length[i  ][level][run][last]
+                                     +intra_chroma_count*rl_length[i+3][level][run][last]
+                                     +inter_count       *rl_length[i+3][level][run][last];
+                    }
+                }
+                if(last_size == size+chroma_size) break;
+            }
+        }
+        if(size<best_size){
+            best_size= size;
+            best= i;
+        }
+        if(chroma_size<best_chroma_size){
+            best_chroma_size= chroma_size;
+            chroma_best= i;
+        }
+    }
+
+//    printf("type:%d, best:%d, qp:%d, var:%d, mcvar:%d, size:%d //\n",
+//           s->pict_type, best, s->qscale, s->mb_var_sum, s->mc_mb_var_sum, best_size);
+
+    if(s->pict_type==AV_PICTURE_TYPE_P) chroma_best= best;
+
+    memset(s->ac_stats, 0, sizeof(int)*(MAX_LEVEL+1)*(MAX_RUN+1)*2*2*2);
+
+    s->rl_table_index       =        best;
+    s->rl_chroma_table_index= chroma_best;
+
+    if(s->pict_type != s->last_non_b_pict_type){
+        s->rl_table_index= 2;
+        if(s->pict_type==AV_PICTURE_TYPE_I)
+            s->rl_chroma_table_index= 1;
+        else
+            s->rl_chroma_table_index= 2;
+    }
+
+}
+
+/* write MSMPEG4 compatible frame header */
+void ff_msmpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
+{
+    find_best_tables(s);
+
+    avpriv_align_put_bits(&s->pb);
+    put_bits(&s->pb, 2, s->pict_type - 1);
+
+    put_bits(&s->pb, 5, s->qscale);
+    if(s->msmpeg4_version<=2){
+        s->rl_table_index = 2;
+        s->rl_chroma_table_index = 2;
+    }
+
+    s->dc_table_index = 1;
+    s->mv_table_index = 1; /* only if P frame */
+    s->use_skip_mb_code = 1; /* only if P frame */
+    s->per_mb_rl_table = 0;
+    if(s->msmpeg4_version==4)
+        s->inter_intra_pred= (s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE && s->pict_type==AV_PICTURE_TYPE_P);
+//printf("%d %d %d %d %d\n", s->pict_type, s->bit_rate, s->inter_intra_pred, s->width, s->height);
+
+    if (s->pict_type == AV_PICTURE_TYPE_I) {
+        s->slice_height= s->mb_height/1;
+        put_bits(&s->pb, 5, 0x16 + s->mb_height/s->slice_height);
+
+        if(s->msmpeg4_version==4){
+            ff_msmpeg4_encode_ext_header(s);
+            if(s->bit_rate>MBAC_BITRATE)
+                put_bits(&s->pb, 1, s->per_mb_rl_table);
+        }
+
+        if(s->msmpeg4_version>2){
+            if(!s->per_mb_rl_table){
+                ff_msmpeg4_code012(&s->pb, s->rl_chroma_table_index);
+                ff_msmpeg4_code012(&s->pb, s->rl_table_index);
+            }
+
+            put_bits(&s->pb, 1, s->dc_table_index);
+        }
+    } else {
+        put_bits(&s->pb, 1, s->use_skip_mb_code);
+
+        if(s->msmpeg4_version==4 && s->bit_rate>MBAC_BITRATE)
+            put_bits(&s->pb, 1, s->per_mb_rl_table);
+
+        if(s->msmpeg4_version>2){
+            if(!s->per_mb_rl_table)
+                ff_msmpeg4_code012(&s->pb, s->rl_table_index);
+
+            put_bits(&s->pb, 1, s->dc_table_index);
+
+            put_bits(&s->pb, 1, s->mv_table_index);
+        }
+    }
+
+    s->esc3_level_length= 0;
+    s->esc3_run_length= 0;
+}
+
+void ff_msmpeg4_encode_ext_header(MpegEncContext * s)
+{
+        put_bits(&s->pb, 5, s->avctx->time_base.den / s->avctx->time_base.num); //yes 29.97 -> 29
+
+        put_bits(&s->pb, 11, FFMIN(s->bit_rate/1024, 2047));
+
+        if(s->msmpeg4_version>=3)
+            put_bits(&s->pb, 1, s->flipflop_rounding);
+        else
+            assert(s->flipflop_rounding==0);
+}
+
+void ff_msmpeg4_encode_motion(MpegEncContext * s,
+                                  int mx, int my)
+{
+    int code;
+    MVTable *mv;
+
+    /* modulo encoding */
+    /* WARNING : you cannot reach all the MVs even with the modulo
+       encoding. This is a somewhat strange compromise they took !!!  */
+    if (mx <= -64)
+        mx += 64;
+    else if (mx >= 64)
+        mx -= 64;
+    if (my <= -64)
+        my += 64;
+    else if (my >= 64)
+        my -= 64;
+
+    mx += 32;
+    my += 32;
+#if 0
+    if ((unsigned)mx >= 64 ||
+        (unsigned)my >= 64)
+        av_log(s->avctx, AV_LOG_ERROR, "error mx=%d my=%d\n", mx, my);
+#endif
+    mv = &ff_mv_tables[s->mv_table_index];
+
+    code = mv->table_mv_index[(mx << 6) | my];
+    put_bits(&s->pb,
+             mv->table_mv_bits[code],
+             mv->table_mv_code[code]);
+    if (code == mv->n) {
+        /* escape : code literally */
+        put_bits(&s->pb, 6, mx);
+        put_bits(&s->pb, 6, my);
+    }
+}
+
+void ff_msmpeg4_handle_slices(MpegEncContext *s){
+    if (s->mb_x == 0) {
+        if (s->slice_height && (s->mb_y % s->slice_height) == 0) {
+            if(s->msmpeg4_version < 4){
+                ff_mpeg4_clean_buffers(s);
+            }
+            s->first_slice_line = 1;
+        } else {
+            s->first_slice_line = 0;
+        }
+    }
+}
+
+static void msmpeg4v2_encode_motion(MpegEncContext * s, int val)
+{
+    int range, bit_size, sign, code, bits;
+
+    if (val == 0) {
+        /* zero vector */
+        code = 0;
+        put_bits(&s->pb, ff_mvtab[code][1], ff_mvtab[code][0]);
+    } else {
+        bit_size = s->f_code - 1;
+        range = 1 << bit_size;
+        if (val <= -64)
+            val += 64;
+        else if (val >= 64)
+            val -= 64;
+
+        if (val >= 0) {
+            sign = 0;
+        } else {
+            val = -val;
+            sign = 1;
+        }
+        val--;
+        code = (val >> bit_size) + 1;
+        bits = val & (range - 1);
+
+        put_bits(&s->pb, ff_mvtab[code][1] + 1, (ff_mvtab[code][0] << 1) | sign);
+        if (bit_size > 0) {
+            put_bits(&s->pb, bit_size, bits);
+        }
+    }
+}
+
+void ff_msmpeg4_encode_mb(MpegEncContext * s,
+                          DCTELEM block[6][64],
+                          int motion_x, int motion_y)
+{
+    int cbp, coded_cbp, i;
+    int pred_x, pred_y;
+    uint8_t *coded_block;
+
+    ff_msmpeg4_handle_slices(s);
+
+    if (!s->mb_intra) {
+        /* compute cbp */
+        cbp = 0;
+        for (i = 0; i < 6; i++) {
+            if (s->block_last_index[i] >= 0)
+                cbp |= 1 << (5 - i);
+        }
+        if (s->use_skip_mb_code && (cbp | motion_x | motion_y) == 0) {
+            /* skip macroblock */
+            put_bits(&s->pb, 1, 1);
+            s->last_bits++;
+            s->misc_bits++;
+            s->skip_count++;
+
+            return;
+        }
+        if (s->use_skip_mb_code)
+            put_bits(&s->pb, 1, 0);     /* mb coded */
+
+        if(s->msmpeg4_version<=2){
+            put_bits(&s->pb,
+                     ff_v2_mb_type[cbp&3][1],
+                     ff_v2_mb_type[cbp&3][0]);
+            if((cbp&3) != 3) coded_cbp= cbp ^ 0x3C;
+            else             coded_cbp= cbp;
+
+            put_bits(&s->pb,
+                     ff_h263_cbpy_tab[coded_cbp>>2][1],
+                     ff_h263_cbpy_tab[coded_cbp>>2][0]);
+
+            s->misc_bits += get_bits_diff(s);
+
+            ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
+            msmpeg4v2_encode_motion(s, motion_x - pred_x);
+            msmpeg4v2_encode_motion(s, motion_y - pred_y);
+        }else{
+            put_bits(&s->pb,
+                     ff_table_mb_non_intra[cbp + 64][1],
+                     ff_table_mb_non_intra[cbp + 64][0]);
+
+            s->misc_bits += get_bits_diff(s);
+
+            /* motion vector */
+            ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
+            ff_msmpeg4_encode_motion(s, motion_x - pred_x,
+                                  motion_y - pred_y);
+        }
+
+        s->mv_bits += get_bits_diff(s);
+
+        for (i = 0; i < 6; i++) {
+            ff_msmpeg4_encode_block(s, block[i], i);
+        }
+        s->p_tex_bits += get_bits_diff(s);
+    } else {
+        /* compute cbp */
+        cbp = 0;
+        coded_cbp = 0;
+        for (i = 0; i < 6; i++) {
+            int val, pred;
+            val = (s->block_last_index[i] >= 1);
+            cbp |= val << (5 - i);
+            if (i < 4) {
+                /* predict value for close blocks only for luma */
+                pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
+                *coded_block = val;
+                val = val ^ pred;
+            }
+            coded_cbp |= val << (5 - i);
+        }
+
+        if(s->msmpeg4_version<=2){
+            if (s->pict_type == AV_PICTURE_TYPE_I) {
+                put_bits(&s->pb,
+                         ff_v2_intra_cbpc[cbp&3][1], ff_v2_intra_cbpc[cbp&3][0]);
+            } else {
+                if (s->use_skip_mb_code)
+                    put_bits(&s->pb, 1, 0);     /* mb coded */
+                put_bits(&s->pb,
+                         ff_v2_mb_type[(cbp&3) + 4][1],
+                         ff_v2_mb_type[(cbp&3) + 4][0]);
+            }
+            put_bits(&s->pb, 1, 0);             /* no AC prediction yet */
+            put_bits(&s->pb,
+                     ff_h263_cbpy_tab[cbp>>2][1],
+                     ff_h263_cbpy_tab[cbp>>2][0]);
+        }else{
+            if (s->pict_type == AV_PICTURE_TYPE_I) {
+                put_bits(&s->pb,
+                         ff_msmp4_mb_i_table[coded_cbp][1], ff_msmp4_mb_i_table[coded_cbp][0]);
+            } else {
+                if (s->use_skip_mb_code)
+                    put_bits(&s->pb, 1, 0);     /* mb coded */
+                put_bits(&s->pb,
+                         ff_table_mb_non_intra[cbp][1],
+                         ff_table_mb_non_intra[cbp][0]);
+            }
+            put_bits(&s->pb, 1, 0);             /* no AC prediction yet */
+            if(s->inter_intra_pred){
+                s->h263_aic_dir=0;
+                put_bits(&s->pb, ff_table_inter_intra[s->h263_aic_dir][1], ff_table_inter_intra[s->h263_aic_dir][0]);
+            }
+        }
+        s->misc_bits += get_bits_diff(s);
+
+        for (i = 0; i < 6; i++) {
+            ff_msmpeg4_encode_block(s, block[i], i);
+        }
+        s->i_tex_bits += get_bits_diff(s);
+        s->i_count++;
+    }
+}
+
+static void msmpeg4_encode_dc(MpegEncContext * s, int level, int n, int *dir_ptr)
+{
+    int sign, code;
+    int pred, extquant;
+    int extrabits = 0;
+
+    int16_t *dc_val;
+    pred = ff_msmpeg4_pred_dc(s, n, &dc_val, dir_ptr);
+
+    /* update predictor */
+    if (n < 4) {
+        *dc_val = level * s->y_dc_scale;
+    } else {
+        *dc_val = level * s->c_dc_scale;
+    }
+
+    /* do the prediction */
+    level -= pred;
+
+    if(s->msmpeg4_version<=2){
+        if (n < 4) {
+            put_bits(&s->pb,
+                     ff_v2_dc_lum_table[level + 256][1],
+                     ff_v2_dc_lum_table[level + 256][0]);
+        }else{
+            put_bits(&s->pb,
+                     ff_v2_dc_chroma_table[level + 256][1],
+                     ff_v2_dc_chroma_table[level + 256][0]);
+        }
+    }else{
+        sign = 0;
+        if (level < 0) {
+            level = -level;
+            sign = 1;
+        }
+        code = level;
+        if (code > DC_MAX)
+            code = DC_MAX;
+        else if( s->msmpeg4_version>=6 ) {
+            if( s->qscale == 1 ) {
+                extquant = (level + 3) & 0x3;
+                code  = ((level+3)>>2);
+            } else if( s->qscale == 2 ) {
+                extquant = (level + 1) & 0x1;
+                code  = ((level+1)>>1);
+            }
+        }
+
+        if (s->dc_table_index == 0) {
+            if (n < 4) {
+                put_bits(&s->pb, ff_table0_dc_lum[code][1], ff_table0_dc_lum[code][0]);
+            } else {
+                put_bits(&s->pb, ff_table0_dc_chroma[code][1], ff_table0_dc_chroma[code][0]);
+            }
+        } else {
+            if (n < 4) {
+                put_bits(&s->pb, ff_table1_dc_lum[code][1], ff_table1_dc_lum[code][0]);
+            } else {
+                put_bits(&s->pb, ff_table1_dc_chroma[code][1], ff_table1_dc_chroma[code][0]);
+            }
+        }
+
+        if(s->msmpeg4_version>=6 && s->qscale<=2)
+            extrabits = 3 - s->qscale;
+
+        if (code == DC_MAX)
+            put_bits(&s->pb, 8 + extrabits, level);
+        else if(extrabits > 0)//== VC1 && s->qscale<=2
+            put_bits(&s->pb, extrabits, extquant);
+
+        if (level != 0) {
+            put_bits(&s->pb, 1, sign);
+        }
+    }
+}
+
+/* Encoding of a block. Very similar to MPEG4 except for a different
+   escape coding (same as H263) and more vlc tables.
+ */
+void ff_msmpeg4_encode_block(MpegEncContext * s, DCTELEM * block, int n)
+{
+    int level, run, last, i, j, last_index;
+    int last_non_zero, sign, slevel;
+    int code, run_diff, dc_pred_dir;
+    const RLTable *rl;
+    const uint8_t *scantable;
+
+    if (s->mb_intra) {
+        msmpeg4_encode_dc(s, block[0], n, &dc_pred_dir);
+        i = 1;
+        if (n < 4) {
+            rl = &ff_rl_table[s->rl_table_index];
+        } else {
+            rl = &ff_rl_table[3 + s->rl_chroma_table_index];
+        }
+        run_diff = s->msmpeg4_version>=4;
+        scantable= s->intra_scantable.permutated;
+    } else {
+        i = 0;
+        rl = &ff_rl_table[3 + s->rl_table_index];
+        if(s->msmpeg4_version<=2)
+            run_diff = 0;
+        else
+            run_diff = 1;
+        scantable= s->inter_scantable.permutated;
+    }
+
+    /* recalculate block_last_index for M$ wmv1 */
+    if(s->msmpeg4_version>=4 && s->msmpeg4_version<6 && s->block_last_index[n]>0){
+        for(last_index=63; last_index>=0; last_index--){
+            if(block[scantable[last_index]]) break;
+        }
+        s->block_last_index[n]= last_index;
+    }else
+        last_index = s->block_last_index[n];
+    /* AC coefs */
+    last_non_zero = i - 1;
+    for (; i <= last_index; i++) {
+        j = scantable[i];
+        level = block[j];
+        if (level) {
+            run = i - last_non_zero - 1;
+            last = (i == last_index);
+            sign = 0;
+            slevel = level;
+            if (level < 0) {
+                sign = 1;
+                level = -level;
+            }
+
+            if(level<=MAX_LEVEL && run<=MAX_RUN){
+                s->ac_stats[s->mb_intra][n>3][level][run][last]++;
+            }
+
+            s->ac_stats[s->mb_intra][n > 3][40][63][0]++; //esc3 like
+
+            code = get_rl_index(rl, last, run, level);
+            put_bits(&s->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(&s->pb, 1, 0);
+                    if (level > MAX_LEVEL)
+                        goto esc3;
+                    run1 = run - rl->max_run[last][level] - run_diff;
+                    if (run1 < 0)
+                        goto esc3;
+                    code = get_rl_index(rl, last, run1+1, level);
+                    if (s->msmpeg4_version == 4 && code == rl->n)
+                        goto esc3;
+                    code = get_rl_index(rl, last, run1, level);
+                    if (code == rl->n) {
+                    esc3:
+                        /* third escape */
+                        put_bits(&s->pb, 1, 0);
+                        put_bits(&s->pb, 1, last);
+                        if(s->msmpeg4_version>=4){
+                            if(s->esc3_level_length==0){
+                                s->esc3_level_length=8;
+                                s->esc3_run_length= 6;
+                                //ESCLVLSZ + ESCRUNSZ
+                                if(s->qscale<8)
+                                    put_bits(&s->pb, 6 + (s->msmpeg4_version>=6), 3);
+                                else
+                                    put_bits(&s->pb, 8, 3);
+                            }
+                            put_bits(&s->pb, s->esc3_run_length, run);
+                            put_bits(&s->pb, 1, sign);
+                            put_bits(&s->pb, s->esc3_level_length, level);
+                        }else{
+                            put_bits(&s->pb, 6, run);
+                            put_sbits(&s->pb, 8, slevel);
+                        }
+                    } else {
+                        /* second escape */
+                        put_bits(&s->pb, 1, 1);
+                        put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
+                        put_bits(&s->pb, 1, sign);
+                    }
+                } else {
+                    /* first escape */
+                    put_bits(&s->pb, 1, 1);
+                    put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
+                    put_bits(&s->pb, 1, sign);
+                }
+            } else {
+                put_bits(&s->pb, 1, sign);
+            }
+            last_non_zero = i;
+        }
+    }
+}