msmpeg4: Split decoding related functions to a separate file

This fixes standalone compilation of the msmpeg4v2, msmpeg4v3
and wmv2 encoders, that previously failed to link due to the
decoder codepaths requiring error_resilience.

Signed-off-by: Martin Storsjö <martin@martin.st>

1 files changed, 0 insertions, 919 deletions

diff --git a/libavcodec/msmpeg4.c b/libavcodec/msmpeg4.c
index e22a8e40f5..3985f19ff2 100644
--- a/libavcodec/msmpeg4.c
+++ b/libavcodec/msmpeg4.c
@@ -46,15 +46,6 @@
  */
 //#define DEBUG
 
-#define DC_VLC_BITS 9
-#define V2_INTRA_CBPC_VLC_BITS 3
-#define V2_MB_TYPE_VLC_BITS 7
-#define MV_VLC_BITS 9
-#define V2_MV_VLC_BITS 9
-#define TEX_VLC_BITS 9
-
-#define DEFAULT_INTER_INDEX 3
-
 /* This table is practically identical to the one from h263
  * except that it is inverted. */
 static av_cold void init_h263_dc_for_msmpeg4(void)
@@ -187,21 +178,6 @@ int ff_msmpeg4_coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block
     return pred;
 }
 
-static inline int msmpeg4v1_pred_dc(MpegEncContext * s, int n,
-                                    int32_t **dc_val_ptr)
-{
-    int i;
-
-    if (n < 4) {
-        i= 0;
-    } else {
-        i= n-3;
-    }
-
-    *dc_val_ptr= &s->last_dc[i];
-    return s->last_dc[i];
-}
-
 static int get_dc(uint8_t *src, int stride, int scale)
 {
     int y;
@@ -363,898 +339,3 @@ int ff_msmpeg4_pred_dc(MpegEncContext *s, int n,
     return pred;
 }
 
-/****************************************/
-/* decoding stuff */
-
-VLC ff_mb_non_intra_vlc[4];
-static VLC v2_dc_lum_vlc;
-static VLC v2_dc_chroma_vlc;
-static VLC v2_intra_cbpc_vlc;
-static VLC v2_mb_type_vlc;
-static VLC v2_mv_vlc;
-VLC ff_inter_intra_vlc;
-
-/* This is identical to h263 except that its range is multiplied by 2. */
-static int msmpeg4v2_decode_motion(MpegEncContext * s, int pred, int f_code)
-{
-    int code, val, sign, shift;
-
-    code = get_vlc2(&s->gb, v2_mv_vlc.table, V2_MV_VLC_BITS, 2);
-    av_dlog(s, "MV code %d at %d %d pred: %d\n", code, s->mb_x,s->mb_y, pred);
-    if (code < 0)
-        return 0xffff;
-
-    if (code == 0)
-        return pred;
-    sign = get_bits1(&s->gb);
-    shift = f_code - 1;
-    val = code;
-    if (shift) {
-        val = (val - 1) << shift;
-        val |= get_bits(&s->gb, shift);
-        val++;
-    }
-    if (sign)
-        val = -val;
-
-    val += pred;
-    if (val <= -64)
-        val += 64;
-    else if (val >= 64)
-        val -= 64;
-
-    return val;
-}
-
-static int msmpeg4v12_decode_mb(MpegEncContext *s, int16_t block[6][64])
-{
-    int cbp, code, i;
-
-    if (s->pict_type == AV_PICTURE_TYPE_P) {
-        if (s->use_skip_mb_code) {
-            if (get_bits1(&s->gb)) {
-                /* skip mb */
-                s->mb_intra = 0;
-                for(i=0;i<6;i++)
-                    s->block_last_index[i] = -1;
-                s->mv_dir = MV_DIR_FORWARD;
-                s->mv_type = MV_TYPE_16X16;
-                s->mv[0][0][0] = 0;
-                s->mv[0][0][1] = 0;
-                s->mb_skipped = 1;
-                return 0;
-            }
-        }
-
-        if(s->msmpeg4_version==2)
-            code = get_vlc2(&s->gb, v2_mb_type_vlc.table, V2_MB_TYPE_VLC_BITS, 1);
-        else
-            code = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
-        if(code<0 || code>7){
-            av_log(s->avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n", code, s->mb_x, s->mb_y);
-            return -1;
-        }
-
-        s->mb_intra = code >>2;
-
-        cbp = code & 0x3;
-    } else {
-        s->mb_intra = 1;
-        if(s->msmpeg4_version==2)
-            cbp= get_vlc2(&s->gb, v2_intra_cbpc_vlc.table, V2_INTRA_CBPC_VLC_BITS, 1);
-        else
-            cbp= get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 1);
-        if(cbp<0 || cbp>3){
-            av_log(s->avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n", cbp, s->mb_x, s->mb_y);
-            return -1;
-        }
-    }
-
-    if (!s->mb_intra) {
-        int mx, my, cbpy;
-
-        cbpy= get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
-        if(cbpy<0){
-            av_log(s->avctx, AV_LOG_ERROR, "cbpy %d invalid at %d %d\n", cbp, s->mb_x, s->mb_y);
-            return -1;
-        }
-
-        cbp|= cbpy<<2;
-        if(s->msmpeg4_version==1 || (cbp&3) != 3) cbp^= 0x3C;
-
-        ff_h263_pred_motion(s, 0, 0, &mx, &my);
-        mx= msmpeg4v2_decode_motion(s, mx, 1);
-        my= msmpeg4v2_decode_motion(s, my, 1);
-
-        s->mv_dir = MV_DIR_FORWARD;
-        s->mv_type = MV_TYPE_16X16;
-        s->mv[0][0][0] = mx;
-        s->mv[0][0][1] = my;
-    } else {
-        if(s->msmpeg4_version==2){
-            s->ac_pred = get_bits1(&s->gb);
-            cbp|= get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1)<<2; //FIXME check errors
-        } else{
-            s->ac_pred = 0;
-            cbp|= get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1)<<2; //FIXME check errors
-            if(s->pict_type==AV_PICTURE_TYPE_P) cbp^=0x3C;
-        }
-    }
-
-    s->dsp.clear_blocks(s->block[0]);
-    for (i = 0; i < 6; i++) {
-        if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
-        {
-             av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
-             return -1;
-        }
-    }
-    return 0;
-}
-
-static int msmpeg4v34_decode_mb(MpegEncContext *s, int16_t block[6][64])
-{
-    int cbp, code, i;
-    uint8_t *coded_val;
-    uint32_t * const mb_type_ptr = &s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride];
-
-    if (s->pict_type == AV_PICTURE_TYPE_P) {
-        if (s->use_skip_mb_code) {
-            if (get_bits1(&s->gb)) {
-                /* skip mb */
-                s->mb_intra = 0;
-                for(i=0;i<6;i++)
-                    s->block_last_index[i] = -1;
-                s->mv_dir = MV_DIR_FORWARD;
-                s->mv_type = MV_TYPE_16X16;
-                s->mv[0][0][0] = 0;
-                s->mv[0][0][1] = 0;
-                s->mb_skipped = 1;
-                *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
-
-                return 0;
-            }
-        }
-
-        code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[DEFAULT_INTER_INDEX].table, MB_NON_INTRA_VLC_BITS, 3);
-        if (code < 0)
-            return -1;
-        //s->mb_intra = (code & 0x40) ? 0 : 1;
-        s->mb_intra = (~code & 0x40) >> 6;
-
-        cbp = code & 0x3f;
-    } else {
-        s->mb_intra = 1;
-        code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
-        if (code < 0)
-            return -1;
-        /* predict coded block pattern */
-        cbp = 0;
-        for(i=0;i<6;i++) {
-            int val = ((code >> (5 - i)) & 1);
-            if (i < 4) {
-                int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
-                val = val ^ pred;
-                *coded_val = val;
-            }
-            cbp |= val << (5 - i);
-        }
-    }
-
-    if (!s->mb_intra) {
-        int mx, my;
-        if(s->per_mb_rl_table && cbp){
-            s->rl_table_index = decode012(&s->gb);
-            s->rl_chroma_table_index = s->rl_table_index;
-        }
-        ff_h263_pred_motion(s, 0, 0, &mx, &my);
-        if (ff_msmpeg4_decode_motion(s, &mx, &my) < 0)
-            return -1;
-        s->mv_dir = MV_DIR_FORWARD;
-        s->mv_type = MV_TYPE_16X16;
-        s->mv[0][0][0] = mx;
-        s->mv[0][0][1] = my;
-        *mb_type_ptr = MB_TYPE_L0 | MB_TYPE_16x16;
-    } else {
-        av_dlog(s, "I at %d %d %d %06X\n", s->mb_x, s->mb_y,
-                ((cbp & 3) ? 1 : 0) +((cbp & 0x3C)? 2 : 0),
-                show_bits(&s->gb, 24));
-        s->ac_pred = get_bits1(&s->gb);
-        *mb_type_ptr = MB_TYPE_INTRA;
-        if(s->inter_intra_pred){
-            s->h263_aic_dir= get_vlc2(&s->gb, ff_inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1);
-            av_dlog(s, "%d%d %d %d/",
-                    s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
-        }
-        if(s->per_mb_rl_table && cbp){
-            s->rl_table_index = decode012(&s->gb);
-            s->rl_chroma_table_index = s->rl_table_index;
-        }
-    }
-
-    s->dsp.clear_blocks(s->block[0]);
-    for (i = 0; i < 6; i++) {
-        if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
-        {
-            av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
-            return -1;
-        }
-    }
-
-    return 0;
-}
-
-/* init all vlc decoding tables */
-av_cold int ff_msmpeg4_decode_init(AVCodecContext *avctx)
-{
-    MpegEncContext *s = avctx->priv_data;
-    static int done = 0;
-    int i;
-    MVTable *mv;
-
-    if (ff_h263_decode_init(avctx) < 0)
-        return -1;
-
-    ff_msmpeg4_common_init(s);
-
-    if (!done) {
-        done = 1;
-
-        for(i=0;i<NB_RL_TABLES;i++) {
-            ff_init_rl(&ff_rl_table[i], ff_static_rl_table_store[i]);
-        }
-        INIT_VLC_RL(ff_rl_table[0], 642);
-        INIT_VLC_RL(ff_rl_table[1], 1104);
-        INIT_VLC_RL(ff_rl_table[2], 554);
-        INIT_VLC_RL(ff_rl_table[3], 940);
-        INIT_VLC_RL(ff_rl_table[4], 962);
-        INIT_VLC_RL(ff_rl_table[5], 554);
-
-        mv = &ff_mv_tables[0];
-        INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, mv->n + 1,
-                    mv->table_mv_bits, 1, 1,
-                    mv->table_mv_code, 2, 2, 3714);
-        mv = &ff_mv_tables[1];
-        INIT_VLC_STATIC(&mv->vlc, MV_VLC_BITS, mv->n + 1,
-                    mv->table_mv_bits, 1, 1,
-                    mv->table_mv_code, 2, 2, 2694);
-
-        INIT_VLC_STATIC(&ff_msmp4_dc_luma_vlc[0], DC_VLC_BITS, 120,
-                 &ff_table0_dc_lum[0][1], 8, 4,
-                 &ff_table0_dc_lum[0][0], 8, 4, 1158);
-        INIT_VLC_STATIC(&ff_msmp4_dc_chroma_vlc[0], DC_VLC_BITS, 120,
-                 &ff_table0_dc_chroma[0][1], 8, 4,
-                 &ff_table0_dc_chroma[0][0], 8, 4, 1118);
-        INIT_VLC_STATIC(&ff_msmp4_dc_luma_vlc[1], DC_VLC_BITS, 120,
-                 &ff_table1_dc_lum[0][1], 8, 4,
-                 &ff_table1_dc_lum[0][0], 8, 4, 1476);
-        INIT_VLC_STATIC(&ff_msmp4_dc_chroma_vlc[1], DC_VLC_BITS, 120,
-                 &ff_table1_dc_chroma[0][1], 8, 4,
-                 &ff_table1_dc_chroma[0][0], 8, 4, 1216);
-
-        INIT_VLC_STATIC(&v2_dc_lum_vlc, DC_VLC_BITS, 512,
-                 &ff_v2_dc_lum_table[0][1], 8, 4,
-                 &ff_v2_dc_lum_table[0][0], 8, 4, 1472);
-        INIT_VLC_STATIC(&v2_dc_chroma_vlc, DC_VLC_BITS, 512,
-                 &ff_v2_dc_chroma_table[0][1], 8, 4,
-                 &ff_v2_dc_chroma_table[0][0], 8, 4, 1506);
-
-        INIT_VLC_STATIC(&v2_intra_cbpc_vlc, V2_INTRA_CBPC_VLC_BITS, 4,
-                 &ff_v2_intra_cbpc[0][1], 2, 1,
-                 &ff_v2_intra_cbpc[0][0], 2, 1, 8);
-        INIT_VLC_STATIC(&v2_mb_type_vlc, V2_MB_TYPE_VLC_BITS, 8,
-                 &ff_v2_mb_type[0][1], 2, 1,
-                 &ff_v2_mb_type[0][0], 2, 1, 128);
-        INIT_VLC_STATIC(&v2_mv_vlc, V2_MV_VLC_BITS, 33,
-                 &ff_mvtab[0][1], 2, 1,
-                 &ff_mvtab[0][0], 2, 1, 538);
-
-        INIT_VLC_STATIC(&ff_mb_non_intra_vlc[0], MB_NON_INTRA_VLC_BITS, 128,
-                     &ff_wmv2_inter_table[0][0][1], 8, 4,
-                     &ff_wmv2_inter_table[0][0][0], 8, 4, 1636);
-        INIT_VLC_STATIC(&ff_mb_non_intra_vlc[1], MB_NON_INTRA_VLC_BITS, 128,
-                     &ff_wmv2_inter_table[1][0][1], 8, 4,
-                     &ff_wmv2_inter_table[1][0][0], 8, 4, 2648);
-        INIT_VLC_STATIC(&ff_mb_non_intra_vlc[2], MB_NON_INTRA_VLC_BITS, 128,
-                     &ff_wmv2_inter_table[2][0][1], 8, 4,
-                     &ff_wmv2_inter_table[2][0][0], 8, 4, 1532);
-        INIT_VLC_STATIC(&ff_mb_non_intra_vlc[3], MB_NON_INTRA_VLC_BITS, 128,
-                     &ff_wmv2_inter_table[3][0][1], 8, 4,
-                     &ff_wmv2_inter_table[3][0][0], 8, 4, 2488);
-
-        INIT_VLC_STATIC(&ff_msmp4_mb_i_vlc, MB_INTRA_VLC_BITS, 64,
-                 &ff_msmp4_mb_i_table[0][1], 4, 2,
-                 &ff_msmp4_mb_i_table[0][0], 4, 2, 536);
-
-        INIT_VLC_STATIC(&ff_inter_intra_vlc, INTER_INTRA_VLC_BITS, 4,
-                 &ff_table_inter_intra[0][1], 2, 1,
-                 &ff_table_inter_intra[0][0], 2, 1, 8);
-    }
-
-    switch(s->msmpeg4_version){
-    case 1:
-    case 2:
-        s->decode_mb= msmpeg4v12_decode_mb;
-        break;
-    case 3:
-    case 4:
-        s->decode_mb= msmpeg4v34_decode_mb;
-        break;
-    case 5:
-        if (CONFIG_WMV2_DECODER)
-            s->decode_mb= ff_wmv2_decode_mb;
-    case 6:
-        //FIXME + TODO VC1 decode mb
-        break;
-    }
-
-    s->slice_height= s->mb_height; //to avoid 1/0 if the first frame is not a keyframe
-
-    return 0;
-}
-
-int ff_msmpeg4_decode_picture_header(MpegEncContext * s)
-{
-    int code;
-
-    if(s->msmpeg4_version==1){
-        int start_code = get_bits_long(&s->gb, 32);
-        if(start_code!=0x00000100){
-            av_log(s->avctx, AV_LOG_ERROR, "invalid startcode\n");
-            return -1;
-        }
-
-        skip_bits(&s->gb, 5); // frame number */
-    }
-
-    s->pict_type = get_bits(&s->gb, 2) + 1;
-    if (s->pict_type != AV_PICTURE_TYPE_I &&
-        s->pict_type != AV_PICTURE_TYPE_P){
-        av_log(s->avctx, AV_LOG_ERROR, "invalid picture type\n");
-        return -1;
-    }
-#if 0
-{
-    static int had_i=0;
-    if(s->pict_type == AV_PICTURE_TYPE_I) had_i=1;
-    if(!had_i) return -1;
-}
-#endif
-    s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
-    if(s->qscale==0){
-        av_log(s->avctx, AV_LOG_ERROR, "invalid qscale\n");
-        return -1;
-    }
-
-    if (s->pict_type == AV_PICTURE_TYPE_I) {
-        code = get_bits(&s->gb, 5);
-        if(s->msmpeg4_version==1){
-            if(code==0 || code>s->mb_height){
-                av_log(s->avctx, AV_LOG_ERROR, "invalid slice height %d\n", code);
-                return -1;
-            }
-
-            s->slice_height = code;
-        }else{
-            /* 0x17: one slice, 0x18: two slices, ... */
-            if (code < 0x17){
-                av_log(s->avctx, AV_LOG_ERROR, "error, slice code was %X\n", code);
-                return -1;
-            }
-
-            s->slice_height = s->mb_height / (code - 0x16);
-        }
-
-        switch(s->msmpeg4_version){
-        case 1:
-        case 2:
-            s->rl_chroma_table_index = 2;
-            s->rl_table_index = 2;
-
-            s->dc_table_index = 0; //not used
-            break;
-        case 3:
-            s->rl_chroma_table_index = decode012(&s->gb);
-            s->rl_table_index = decode012(&s->gb);
-
-            s->dc_table_index = get_bits1(&s->gb);
-            break;
-        case 4:
-            ff_msmpeg4_decode_ext_header(s, (2+5+5+17+7)/8);
-
-            if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb);
-            else                           s->per_mb_rl_table= 0;
-
-            if(!s->per_mb_rl_table){
-                s->rl_chroma_table_index = decode012(&s->gb);
-                s->rl_table_index = decode012(&s->gb);
-            }
-
-            s->dc_table_index = get_bits1(&s->gb);
-            s->inter_intra_pred= 0;
-            break;
-        }
-        s->no_rounding = 1;
-        if(s->avctx->debug&FF_DEBUG_PICT_INFO)
-            av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d slice:%d   \n",
-                s->qscale,
-                s->rl_chroma_table_index,
-                s->rl_table_index,
-                s->dc_table_index,
-                s->per_mb_rl_table,
-                s->slice_height);
-    } else {
-        switch(s->msmpeg4_version){
-        case 1:
-        case 2:
-            if(s->msmpeg4_version==1)
-                s->use_skip_mb_code = 1;
-            else
-                s->use_skip_mb_code = get_bits1(&s->gb);
-            s->rl_table_index = 2;
-            s->rl_chroma_table_index = s->rl_table_index;
-            s->dc_table_index = 0; //not used
-            s->mv_table_index = 0;
-            break;
-        case 3:
-            s->use_skip_mb_code = get_bits1(&s->gb);
-            s->rl_table_index = decode012(&s->gb);
-            s->rl_chroma_table_index = s->rl_table_index;
-
-            s->dc_table_index = get_bits1(&s->gb);
-
-            s->mv_table_index = get_bits1(&s->gb);
-            break;
-        case 4:
-            s->use_skip_mb_code = get_bits1(&s->gb);
-
-            if(s->bit_rate > MBAC_BITRATE) s->per_mb_rl_table= get_bits1(&s->gb);
-            else                           s->per_mb_rl_table= 0;
-
-            if(!s->per_mb_rl_table){
-                s->rl_table_index = decode012(&s->gb);
-                s->rl_chroma_table_index = s->rl_table_index;
-            }
-
-            s->dc_table_index = get_bits1(&s->gb);
-
-            s->mv_table_index = get_bits1(&s->gb);
-            s->inter_intra_pred= (s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
-            break;
-        }
-
-        if(s->avctx->debug&FF_DEBUG_PICT_INFO)
-            av_log(s->avctx, AV_LOG_DEBUG, "skip:%d rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d   \n",
-                s->use_skip_mb_code,
-                s->rl_table_index,
-                s->rl_chroma_table_index,
-                s->dc_table_index,
-                s->mv_table_index,
-                s->per_mb_rl_table,
-                s->qscale);
-
-        if(s->flipflop_rounding){
-            s->no_rounding ^= 1;
-        }else{
-            s->no_rounding = 0;
-        }
-    }
-    av_dlog(s->avctx, "%d %d %d %d %d\n", s->pict_type, s->bit_rate,
-            s->inter_intra_pred, s->width, s->height);
-
-    s->esc3_level_length= 0;
-    s->esc3_run_length= 0;
-
-    return 0;
-}
-
-int ff_msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size)
-{
-    int left= buf_size*8 - get_bits_count(&s->gb);
-    int length= s->msmpeg4_version>=3 ? 17 : 16;
-    /* the alt_bitstream reader could read over the end so we need to check it */
-    if(left>=length && left<length+8)
-    {
-        skip_bits(&s->gb, 5); /* fps */
-        s->bit_rate= get_bits(&s->gb, 11)*1024;
-        if(s->msmpeg4_version>=3)
-            s->flipflop_rounding= get_bits1(&s->gb);
-        else
-            s->flipflop_rounding= 0;
-    }
-    else if(left<length+8)
-    {
-        s->flipflop_rounding= 0;
-        if(s->msmpeg4_version != 2)
-            av_log(s->avctx, AV_LOG_ERROR, "ext header missing, %d left\n", left);
-    }
-    else
-    {
-        av_log(s->avctx, AV_LOG_ERROR, "I frame too long, ignoring ext header\n");
-    }
-
-    return 0;
-}
-
-static int msmpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
-{
-    int level, pred;
-
-    if(s->msmpeg4_version<=2){
-        if (n < 4) {
-            level = get_vlc2(&s->gb, v2_dc_lum_vlc.table, DC_VLC_BITS, 3);
-        } else {
-            level = get_vlc2(&s->gb, v2_dc_chroma_vlc.table, DC_VLC_BITS, 3);
-        }
-        if (level < 0)
-            return -1;
-        level-=256;
-    }else{  //FIXME optimize use unified tables & index
-        if (n < 4) {
-            level = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
-        } else {
-            level = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
-        }
-        if (level < 0){
-            av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
-            return -1;
-        }
-
-        if (level == DC_MAX) {
-            level = get_bits(&s->gb, 8);
-            if (get_bits1(&s->gb))
-                level = -level;
-        } else if (level != 0) {
-            if (get_bits1(&s->gb))
-                level = -level;
-        }
-    }
-
-    if(s->msmpeg4_version==1){
-        int32_t *dc_val;
-        pred = msmpeg4v1_pred_dc(s, n, &dc_val);
-        level += pred;
-
-        /* update predictor */
-        *dc_val= level;
-    }else{
-        int16_t *dc_val;
-        pred   = ff_msmpeg4_pred_dc(s, n, &dc_val, dir_ptr);
-        level += pred;
-
-        /* update predictor */
-        if (n < 4) {
-            *dc_val = level * s->y_dc_scale;
-        } else {
-            *dc_val = level * s->c_dc_scale;
-        }
-    }
-
-    return level;
-}
-
-//#define ERROR_DETAILS
-int ff_msmpeg4_decode_block(MpegEncContext * s, int16_t * block,
-                              int n, int coded, const uint8_t *scan_table)
-{
-    int level, i, last, run, run_diff;
-    int av_uninit(dc_pred_dir);
-    RLTable *rl;
-    RL_VLC_ELEM *rl_vlc;
-    int qmul, qadd;
-
-    if (s->mb_intra) {
-        qmul=1;
-        qadd=0;
-
-        /* DC coef */
-        level = msmpeg4_decode_dc(s, n, &dc_pred_dir);
-
-        if (level < 0){
-            av_log(s->avctx, AV_LOG_ERROR, "dc overflow- block: %d qscale: %d//\n", n, s->qscale);
-            if(s->inter_intra_pred) level=0;
-            else                    return -1;
-        }
-        if (n < 4) {
-            rl = &ff_rl_table[s->rl_table_index];
-            if(level > 256*s->y_dc_scale){
-                av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ L qscale: %d//\n", s->qscale);
-                if(!s->inter_intra_pred) return -1;
-            }
-        } else {
-            rl = &ff_rl_table[3 + s->rl_chroma_table_index];
-            if(level > 256*s->c_dc_scale){
-                av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ C qscale: %d//\n", s->qscale);
-                if(!s->inter_intra_pred) return -1;
-            }
-        }
-        block[0] = level;
-
-        run_diff = s->msmpeg4_version >= 4;
-        i = 0;
-        if (!coded) {
-            goto not_coded;
-        }
-        if (s->ac_pred) {
-            if (dc_pred_dir == 0)
-                scan_table = s->intra_v_scantable.permutated; /* left */
-            else
-                scan_table = s->intra_h_scantable.permutated; /* top */
-        } else {
-            scan_table = s->intra_scantable.permutated;
-        }
-        rl_vlc= rl->rl_vlc[0];
-    } else {
-        qmul = s->qscale << 1;
-        qadd = (s->qscale - 1) | 1;
-        i = -1;
-        rl = &ff_rl_table[3 + s->rl_table_index];
-
-        if(s->msmpeg4_version==2)
-            run_diff = 0;
-        else
-            run_diff = 1;
-
-        if (!coded) {
-            s->block_last_index[n] = i;
-            return 0;
-        }
-        if(!scan_table)
-            scan_table = s->inter_scantable.permutated;
-        rl_vlc= rl->rl_vlc[s->qscale];
-    }
-  {
-    OPEN_READER(re, &s->gb);
-    for(;;) {
-        UPDATE_CACHE(re, &s->gb);
-        GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
-        if (level==0) {
-            int cache;
-            cache= GET_CACHE(re, &s->gb);
-            /* escape */
-            if (s->msmpeg4_version==1 || (cache&0x80000000)==0) {
-                if (s->msmpeg4_version==1 || (cache&0x40000000)==0) {
-                    /* third escape */
-                    if(s->msmpeg4_version!=1) LAST_SKIP_BITS(re, &s->gb, 2);
-                    UPDATE_CACHE(re, &s->gb);
-                    if(s->msmpeg4_version<=3){
-                        last=  SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
-                        run=   SHOW_UBITS(re, &s->gb, 6); SKIP_CACHE(re, &s->gb, 6);
-                        level= SHOW_SBITS(re, &s->gb, 8);
-                        SKIP_COUNTER(re, &s->gb, 1+6+8);
-                    }else{
-                        int sign;
-                        last=  SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
-                        if(!s->esc3_level_length){
-                            int ll;
-                            av_dlog(s->avctx, "ESC-3 %X at %d %d\n",
-                                    show_bits(&s->gb, 24), s->mb_x, s->mb_y);
-                            if(s->qscale<8){
-                                ll= SHOW_UBITS(re, &s->gb, 3); SKIP_BITS(re, &s->gb, 3);
-                                if(ll==0){
-                                    ll= 8+SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
-                                }
-                            }else{
-                                ll=2;
-                                while(ll<8 && SHOW_UBITS(re, &s->gb, 1)==0){
-                                    ll++;
-                                    SKIP_BITS(re, &s->gb, 1);
-                                }
-                                if(ll<8) SKIP_BITS(re, &s->gb, 1);
-                            }
-
-                            s->esc3_level_length= ll;
-                            s->esc3_run_length= SHOW_UBITS(re, &s->gb, 2) + 3; SKIP_BITS(re, &s->gb, 2);
-                            UPDATE_CACHE(re, &s->gb);
-                        }
-                        run=   SHOW_UBITS(re, &s->gb, s->esc3_run_length);
-                        SKIP_BITS(re, &s->gb, s->esc3_run_length);
-
-                        sign=  SHOW_UBITS(re, &s->gb, 1);
-                        SKIP_BITS(re, &s->gb, 1);
-
-                        level= SHOW_UBITS(re, &s->gb, s->esc3_level_length);
-                        SKIP_BITS(re, &s->gb, s->esc3_level_length);
-                        if(sign) level= -level;
-                    }
-
-#if 0 // waste of time / this will detect very few errors
-                    {
-                        const int abs_level= FFABS(level);
-                        const int run1= run - rl->max_run[last][abs_level] - run_diff;
-                        if(abs_level<=MAX_LEVEL && run<=MAX_RUN){
-                            if(abs_level <= rl->max_level[last][run]){
-                                av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
-                                return DECODING_AC_LOST;
-                            }
-                            if(abs_level <= rl->max_level[last][run]*2){
-                                av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
-                                return DECODING_AC_LOST;
-                            }
-                            if(run1>=0 && abs_level <= rl->max_level[last][run1]){
-                                av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
-                                return DECODING_AC_LOST;
-                            }
-                        }
-                    }
-#endif
-                    //level = level * qmul + (level>0) * qadd - (level<=0) * qadd ;
-                    if (level>0) level= level * qmul + qadd;
-                    else         level= level * qmul - qadd;
-#if 0 // waste of time too :(
-                    if(level>2048 || level<-2048){
-                        av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc\n");
-                        return DECODING_AC_LOST;
-                    }
-#endif
-                    i+= run + 1;
-                    if(last) i+=192;
-#ifdef ERROR_DETAILS
-                if(run==66)
-                    av_log(s->avctx, AV_LOG_ERROR, "illegal vlc code in ESC3 level=%d\n", level);
-                else if((i>62 && i<192) || i>192+63)
-                    av_log(s->avctx, AV_LOG_ERROR, "run overflow in ESC3 i=%d run=%d level=%d\n", i, run, level);
-#endif
-                } else {
-                    /* second escape */
-                    SKIP_BITS(re, &s->gb, 2);
-                    GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
-                    i+= run + rl->max_run[run>>7][level/qmul] + run_diff; //FIXME opt indexing
-                    level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
-                    LAST_SKIP_BITS(re, &s->gb, 1);
-#ifdef ERROR_DETAILS
-                if(run==66)
-                    av_log(s->avctx, AV_LOG_ERROR, "illegal vlc code in ESC2 level=%d\n", level);
-                else if((i>62 && i<192) || i>192+63)
-                    av_log(s->avctx, AV_LOG_ERROR, "run overflow in ESC2 i=%d run=%d level=%d\n", i, run, level);
-#endif
-                }
-            } else {
-                /* first escape */
-                SKIP_BITS(re, &s->gb, 1);
-                GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
-                i+= run;
-                level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
-                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
-                LAST_SKIP_BITS(re, &s->gb, 1);
-#ifdef ERROR_DETAILS
-                if(run==66)
-                    av_log(s->avctx, AV_LOG_ERROR, "illegal vlc code in ESC1 level=%d\n", level);
-                else if((i>62 && i<192) || i>192+63)
-                    av_log(s->avctx, AV_LOG_ERROR, "run overflow in ESC1 i=%d run=%d level=%d\n", i, run, level);
-#endif
-            }
-        } else {
-            i+= run;
-            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
-            LAST_SKIP_BITS(re, &s->gb, 1);
-#ifdef ERROR_DETAILS
-                if(run==66)
-                    av_log(s->avctx, AV_LOG_ERROR, "illegal vlc code level=%d\n", level);
-                else if((i>62 && i<192) || i>192+63)
-                    av_log(s->avctx, AV_LOG_ERROR, "run overflow i=%d run=%d level=%d\n", i, run, level);
-#endif
-        }
-        if (i > 62){
-            i-= 192;
-            if(i&(~63)){
-                const int left= get_bits_left(&s->gb);
-                if(((i+192 == 64 && level/qmul==-1) || !(s->err_recognition&AV_EF_BITSTREAM)) && left>=0){
-                    av_log(s->avctx, AV_LOG_ERROR, "ignoring overflow at %d %d\n", s->mb_x, s->mb_y);
-                    break;
-                }else{
-                    av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
-                    return -1;
-                }
-            }
-
-            block[scan_table[i]] = level;
-            break;
-        }
-
-        block[scan_table[i]] = level;
-    }
-    CLOSE_READER(re, &s->gb);
-  }
- not_coded:
-    if (s->mb_intra) {
-        ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
-        if (s->ac_pred) {
-            i = 63; /* XXX: not optimal */
-        }
-    }
-    if(s->msmpeg4_version>=4 && i>0) i=63; //FIXME/XXX optimize
-    s->block_last_index[n] = i;
-
-    return 0;
-}
-
-int ff_msmpeg4_decode_motion(MpegEncContext * s,
-                                 int *mx_ptr, int *my_ptr)
-{
-    MVTable *mv;
-    int code, mx, my;
-
-    mv = &ff_mv_tables[s->mv_table_index];
-
-    code = get_vlc2(&s->gb, mv->vlc.table, MV_VLC_BITS, 2);
-    if (code < 0){
-        av_log(s->avctx, AV_LOG_ERROR, "illegal MV code at %d %d\n", s->mb_x, s->mb_y);
-        return -1;
-    }
-    if (code == mv->n) {
-        mx = get_bits(&s->gb, 6);
-        my = get_bits(&s->gb, 6);
-    } else {
-        mx = mv->table_mvx[code];
-        my = mv->table_mvy[code];
-    }
-
-    mx += *mx_ptr - 32;
-    my += *my_ptr - 32;
-    /* WARNING : they do not do exactly modulo encoding */
-    if (mx <= -64)
-        mx += 64;
-    else if (mx >= 64)
-        mx -= 64;
-
-    if (my <= -64)
-        my += 64;
-    else if (my >= 64)
-        my -= 64;
-    *mx_ptr = mx;
-    *my_ptr = my;
-    return 0;
-}
-
-AVCodec ff_msmpeg4v1_decoder = {
-    .name           = "msmpeg4v1",
-    .type           = AVMEDIA_TYPE_VIDEO,
-    .id             = AV_CODEC_ID_MSMPEG4V1,
-    .priv_data_size = sizeof(MpegEncContext),
-    .init           = ff_msmpeg4_decode_init,
-    .close          = ff_h263_decode_end,
-    .decode         = ff_h263_decode_frame,
-    .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
-    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 1"),
-    .pix_fmts       = ff_pixfmt_list_420,
-};
-
-AVCodec ff_msmpeg4v2_decoder = {
-    .name           = "msmpeg4v2",
-    .type           = AVMEDIA_TYPE_VIDEO,
-    .id             = AV_CODEC_ID_MSMPEG4V2,
-    .priv_data_size = sizeof(MpegEncContext),
-    .init           = ff_msmpeg4_decode_init,
-    .close          = ff_h263_decode_end,
-    .decode         = ff_h263_decode_frame,
-    .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
-    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 2"),
-    .pix_fmts       = ff_pixfmt_list_420,
-};
-
-AVCodec ff_msmpeg4v3_decoder = {
-    .name           = "msmpeg4",
-    .type           = AVMEDIA_TYPE_VIDEO,
-    .id             = AV_CODEC_ID_MSMPEG4V3,
-    .priv_data_size = sizeof(MpegEncContext),
-    .init           = ff_msmpeg4_decode_init,
-    .close          = ff_h263_decode_end,
-    .decode         = ff_h263_decode_frame,
-    .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
-    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 Microsoft variant version 3"),
-    .pix_fmts       = ff_pixfmt_list_420,
-};
-
-AVCodec ff_wmv1_decoder = {
-    .name           = "wmv1",
-    .type           = AVMEDIA_TYPE_VIDEO,
-    .id             = AV_CODEC_ID_WMV1,
-    .priv_data_size = sizeof(MpegEncContext),
-    .init           = ff_msmpeg4_decode_init,
-    .close          = ff_h263_decode_end,
-    .decode         = ff_h263_decode_frame,
-    .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
-    .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 7"),
-    .pix_fmts       = ff_pixfmt_list_420,
-};