avcodec/h264_slice: Fix overflow in slice offset
[ffmpeg.git] / libavcodec / wmv2.c
index 4708454..327c5bd 100644 (file)
 /*
- * Copyright (c) 2002 The FFmpeg Project.
+ * Copyright (c) 2002 The FFmpeg Project
  *
- * This library is free software; you can redistribute it and/or
+ * 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
  *
- * This library is distributed in the hope that it will be useful,
+ * 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- *
- */
-
-/**
- * @file wmv2.c
- * wmv2 codec.
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include "avcodec.h"
+#include "idctdsp.h"
+#include "mpegutils.h"
+#include "mpegvideo.h"
+#include "msmpeg4data.h"
 #include "simple_idct.h"
+#include "wmv2.h"
+#include "wmv2data.h"
 
-#define SKIP_TYPE_NONE 0
-#define SKIP_TYPE_MPEG 1
-#define SKIP_TYPE_ROW  2
-#define SKIP_TYPE_COL  3
-
-
-typedef struct Wmv2Context{
-    MpegEncContext s;
-    int j_type_bit;
-    int j_type;
-    int flag3;
-    int flag63;
-    int abt_flag;
-    int abt_type;
-    int abt_type_table[6];
-    int per_mb_abt;
-    int per_block_abt;
-    int mspel_bit;
-    int cbp_table_index;
-    int top_left_mv_flag;
-    int per_mb_rl_bit;
-    int skip_type;
-    int hshift;
-
-    ScanTable abt_scantable[2];
-    DCTELEM abt_block2[6][64] __align8;
-}Wmv2Context;
-
-static void wmv2_common_init(Wmv2Context * w){
-    MpegEncContext * const s= &w->s;
-
-    ff_init_scantable(s->dsp.idct_permutation, &w->abt_scantable[0], wmv2_scantableA);
-    ff_init_scantable(s->dsp.idct_permutation, &w->abt_scantable[1], wmv2_scantableB);
-}
-
-#ifdef CONFIG_ENCODERS
-
-static int encode_ext_header(Wmv2Context *w){
-    MpegEncContext * const s= &w->s;
-    PutBitContext pb;
-    int code;
-
-    init_put_bits(&pb, s->avctx->extradata, s->avctx->extradata_size);
-
-    put_bits(&pb, 5, s->avctx->time_base.den / s->avctx->time_base.num); //yes 29.97 -> 29
-    put_bits(&pb, 11, FFMIN(s->bit_rate/1024, 2047));
-
-    put_bits(&pb, 1, w->mspel_bit=1);
-    put_bits(&pb, 1, w->flag3=1);
-    put_bits(&pb, 1, w->abt_flag=1);
-    put_bits(&pb, 1, w->j_type_bit=1);
-    put_bits(&pb, 1, w->top_left_mv_flag=0);
-    put_bits(&pb, 1, w->per_mb_rl_bit=1);
-    put_bits(&pb, 3, code=1);
-
-    flush_put_bits(&pb);
-
-    s->slice_height = s->mb_height / code;
-
-    return 0;
-}
-
-static int wmv2_encode_init(AVCodecContext *avctx){
-    Wmv2Context * const w= avctx->priv_data;
-
-    if(MPV_encode_init(avctx) < 0)
-        return -1;
-
-    wmv2_common_init(w);
-
-    avctx->extradata_size= 4;
-    avctx->extradata= av_mallocz(avctx->extradata_size + 10);
-    encode_ext_header(w);
-
-    return 0;
-}
-
-#if 0 /* unused, remove? */
-static int wmv2_encode_end(AVCodecContext *avctx){
-
-    if(MPV_encode_end(avctx) < 0)
-        return -1;
 
-    avctx->extradata_size= 0;
-    av_freep(&avctx->extradata);
-
-    return 0;
-}
-#endif
-
-int ff_wmv2_encode_picture_header(MpegEncContext * s, int picture_number)
+av_cold void ff_wmv2_common_init(Wmv2Context *w)
 {
-    Wmv2Context * const w= (Wmv2Context*)s;
-
-    put_bits(&s->pb, 1, s->pict_type - 1);
-    if(s->pict_type == I_TYPE){
-        put_bits(&s->pb, 7, 0);
-    }
-    put_bits(&s->pb, 5, s->qscale);
-
-    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;
-    s->mspel= 0;
-    w->per_mb_abt=0;
-    w->abt_type=0;
-    w->j_type=0;
-
-    assert(s->flipflop_rounding);
-
-    if (s->pict_type == I_TYPE) {
-        assert(s->no_rounding==1);
-        if(w->j_type_bit) put_bits(&s->pb, 1, w->j_type);
-
-        if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);
-
-        if(!s->per_mb_rl_table){
-            code012(&s->pb, s->rl_chroma_table_index);
-            code012(&s->pb, s->rl_table_index);
-        }
-
-        put_bits(&s->pb, 1, s->dc_table_index);
-
-        s->inter_intra_pred= 0;
-    }else{
-        int cbp_index;
-
-        put_bits(&s->pb, 2, SKIP_TYPE_NONE);
-
-        code012(&s->pb, cbp_index=0);
-        if(s->qscale <= 10){
-            int map[3]= {0,2,1};
-            w->cbp_table_index= map[cbp_index];
-        }else if(s->qscale <= 20){
-            int map[3]= {1,0,2};
-            w->cbp_table_index= map[cbp_index];
-        }else{
-            int map[3]= {2,1,0};
-            w->cbp_table_index= map[cbp_index];
-        }
-
-        if(w->mspel_bit) put_bits(&s->pb, 1, s->mspel);
-
-        if(w->abt_flag){
-            put_bits(&s->pb, 1, w->per_mb_abt^1);
-            if(!w->per_mb_abt){
-                code012(&s->pb, w->abt_type);
-            }
-        }
-
-        if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);
-
-        if(!s->per_mb_rl_table){
-            code012(&s->pb, s->rl_table_index);
-            s->rl_chroma_table_index = s->rl_table_index;
-        }
-        put_bits(&s->pb, 1, s->dc_table_index);
-        put_bits(&s->pb, 1, s->mv_table_index);
-
-        s->inter_intra_pred= 0;//(s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
-    }
-    s->esc3_level_length= 0;
-    s->esc3_run_length= 0;
-
-    return 0;
-}
-
-// nearly idential to wmv1 but thats just because we dont use the useless M$ crap features
-// its duplicated here in case someone wants to add support for these carp features
-void ff_wmv2_encode_mb(MpegEncContext * s,
-                       DCTELEM block[6][64],
-                       int motion_x, int motion_y)
+    MpegEncContext *const s = &w->s;
+
+    ff_blockdsp_init(&s->bdsp, s->avctx);
+    ff_wmv2dsp_init(&w->wdsp);
+    s->idsp.perm_type = w->wdsp.idct_perm;
+    ff_init_scantable_permutation(s->idsp.idct_permutation,
+                                  w->wdsp.idct_perm);
+    ff_init_scantable(s->idsp.idct_permutation, &w->abt_scantable[0],
+                      ff_wmv2_scantableA);
+    ff_init_scantable(s->idsp.idct_permutation, &w->abt_scantable[1],
+                      ff_wmv2_scantableB);
+    ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable,
+                      ff_wmv1_scantable[1]);
+    ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable,
+                      ff_wmv1_scantable[2]);
+    ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable,
+                      ff_wmv1_scantable[3]);
+    ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable,
+                      ff_wmv1_scantable[0]);
+    s->idsp.idct_put = w->wdsp.idct_put;
+    s->idsp.idct_add = w->wdsp.idct_add;
+    s->idsp.idct     = NULL;
+}
+
+static void wmv2_add_block(Wmv2Context *w, int16_t *block1,
+                           uint8_t *dst, int stride, int n)
 {
-    Wmv2Context * const w= (Wmv2Context*)s;
-    int cbp, coded_cbp, i;
-    int pred_x, pred_y;
-    uint8_t *coded_block;
-
-    handle_slices(s);
-
-    if (!s->mb_intra) {
-       /* compute cbp */
-        set_stat(ST_INTER_MB);
-       cbp = 0;
-       for (i = 0; i < 6; i++) {
-           if (s->block_last_index[i] >= 0)
-               cbp |= 1 << (5 - i);
-       }
-
-        put_bits(&s->pb,
-                 wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
-                 wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);
-
-        /* motion vector */
-        h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
-        msmpeg4_encode_motion(s, motion_x - pred_x,
-                              motion_y - pred_y);
-    } 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 = coded_block_pred(s, i, &coded_block);
-                *coded_block = val;
-                val = val ^ pred;
-            }
-            coded_cbp |= val << (5 - i);
-       }
-#if 0
-        if (coded_cbp)
-            printf("cbp=%x %x\n", cbp, coded_cbp);
-#endif
-
-        if (s->pict_type == I_TYPE) {
-            set_stat(ST_INTRA_MB);
-            put_bits(&s->pb,
-                     ff_msmp4_mb_i_table[coded_cbp][1], ff_msmp4_mb_i_table[coded_cbp][0]);
-        } else {
-            put_bits(&s->pb,
-                     wmv2_inter_table[w->cbp_table_index][cbp][1],
-                     wmv2_inter_table[w->cbp_table_index][cbp][0]);
-        }
-        set_stat(ST_INTRA_MB);
-        put_bits(&s->pb, 1, 0);        /* no AC prediction yet */
-        if(s->inter_intra_pred){
-            s->h263_aic_dir=0;
-            put_bits(&s->pb, table_inter_intra[s->h263_aic_dir][1], table_inter_intra[s->h263_aic_dir][0]);
-        }
-    }
-
-    for (i = 0; i < 6; i++) {
-        msmpeg4_encode_block(s, block[i], i);
-    }
-}
-#endif //CONFIG_ENCODERS
-
-static void parse_mb_skip(Wmv2Context * w){
-    int mb_x, mb_y;
-    MpegEncContext * const s= &w->s;
-    uint32_t * const mb_type= s->current_picture_ptr->mb_type;
-
-    w->skip_type= get_bits(&s->gb, 2);
-    switch(w->skip_type){
-    case SKIP_TYPE_NONE:
-        for(mb_y=0; mb_y<s->mb_height; mb_y++){
-            for(mb_x=0; mb_x<s->mb_width; mb_x++){
-                mb_type[mb_y*s->mb_stride + mb_x]= MB_TYPE_16x16 | MB_TYPE_L0;
-            }
-        }
-        break;
-    case SKIP_TYPE_MPEG:
-        for(mb_y=0; mb_y<s->mb_height; mb_y++){
-            for(mb_x=0; mb_x<s->mb_width; mb_x++){
-                mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
-            }
-        }
-        break;
-    case SKIP_TYPE_ROW:
-        for(mb_y=0; mb_y<s->mb_height; mb_y++){
-            if(get_bits1(&s->gb)){
-                for(mb_x=0; mb_x<s->mb_width; mb_x++){
-                    mb_type[mb_y*s->mb_stride + mb_x]=  MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
-                }
-            }else{
-                for(mb_x=0; mb_x<s->mb_width; mb_x++){
-                    mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
-                }
-            }
-        }
-        break;
-    case SKIP_TYPE_COL:
-        for(mb_x=0; mb_x<s->mb_width; mb_x++){
-            if(get_bits1(&s->gb)){
-                for(mb_y=0; mb_y<s->mb_height; mb_y++){
-                    mb_type[mb_y*s->mb_stride + mb_x]=  MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
-                }
-            }else{
-                for(mb_y=0; mb_y<s->mb_height; mb_y++){
-                    mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
-                }
-            }
-        }
-        break;
-    }
-}
-
-static int decode_ext_header(Wmv2Context *w){
-    MpegEncContext * const s= &w->s;
-    GetBitContext gb;
-    int fps;
-    int code;
-
-    if(s->avctx->extradata_size<4) return -1;
-
-    init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
-
-    fps                = get_bits(&gb, 5);
-    s->bit_rate        = get_bits(&gb, 11)*1024;
-    w->mspel_bit       = get_bits1(&gb);
-    w->flag3           = get_bits1(&gb);
-    w->abt_flag        = get_bits1(&gb);
-    w->j_type_bit      = get_bits1(&gb);
-    w->top_left_mv_flag= get_bits1(&gb);
-    w->per_mb_rl_bit   = get_bits1(&gb);
-    code               = get_bits(&gb, 3);
-
-    if(code==0) return -1;
-
-    s->slice_height = s->mb_height / code;
-
-    if(s->avctx->debug&FF_DEBUG_PICT_INFO){
-        av_log(s->avctx, AV_LOG_DEBUG, "fps:%d, br:%d, qpbit:%d, abt_flag:%d, j_type_bit:%d, tl_mv_flag:%d, mbrl_bit:%d, code:%d, flag3:%d, slices:%d\n",
-        fps, s->bit_rate, w->mspel_bit, w->abt_flag, w->j_type_bit, w->top_left_mv_flag, w->per_mb_rl_bit, code, w->flag3,
-        code);
-    }
-    return 0;
-}
-
-int ff_wmv2_decode_picture_header(MpegEncContext * s)
+    MpegEncContext *const s = &w->s;
+
+    if (s->block_last_index[n] >= 0) {
+        switch (w->abt_type_table[n]) {
+        case 0:
+            w->wdsp.idct_add(dst, stride, block1);
+            break;
+        case 1:
+            ff_simple_idct84_add(dst, stride, block1);
+            ff_simple_idct84_add(dst + 4 * stride, stride, w->abt_block2[n]);
+            s->bdsp.clear_block(w->abt_block2[n]);
+            break;
+        case 2:
+            ff_simple_idct48_add(dst, stride, block1);
+            ff_simple_idct48_add(dst + 4, stride, w->abt_block2[n]);
+            s->bdsp.clear_block(w->abt_block2[n]);
+            break;
+        default:
+            av_log(s->avctx, AV_LOG_ERROR, "internal error in WMV2 abt\n");
+        }
+    }
+}
+
+void ff_wmv2_add_mb(MpegEncContext *s, int16_t block1[6][64],
+                    uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr)
 {
-    Wmv2Context * const w= (Wmv2Context*)s;
-    int code;
+    Wmv2Context *const w = (Wmv2Context *) s;
 
-#if 0
-{
-int i;
-for(i=0; i<s->gb.size*8; i++)
-    printf("%d", get_bits1(&s->gb));
-//    get_bits1(&s->gb);
-printf("END\n");
-return -1;
-}
-#endif
-    if(s->picture_number==0)
-        decode_ext_header(w);
+    wmv2_add_block(w, block1[0], dest_y,                       s->linesize, 0);
+    wmv2_add_block(w, block1[1], dest_y + 8,                   s->linesize, 1);
+    wmv2_add_block(w, block1[2], dest_y + 8 * s->linesize,     s->linesize, 2);
+    wmv2_add_block(w, block1[3], dest_y + 8 + 8 * s->linesize, s->linesize, 3);
 
-    s->pict_type = get_bits(&s->gb, 1) + 1;
-    if(s->pict_type == I_TYPE){
-        code = get_bits(&s->gb, 7);
-        av_log(s->avctx, AV_LOG_DEBUG, "I7:%X/\n", code);
-    }
-    s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
-    if(s->qscale < 0)
-       return -1;
+    if (s->avctx->flags & AV_CODEC_FLAG_GRAY)
+        return;
 
-    return 0;
+    wmv2_add_block(w, block1[4], dest_cb, s->uvlinesize, 4);
+    wmv2_add_block(w, block1[5], dest_cr, s->uvlinesize, 5);
 }
 
-int ff_wmv2_decode_secondary_picture_header(MpegEncContext * s)
+void ff_mspel_motion(MpegEncContext *s, uint8_t *dest_y,
+                     uint8_t *dest_cb, uint8_t *dest_cr,
+                     uint8_t **ref_picture, op_pixels_func (*pix_op)[4],
+                     int motion_x, int motion_y, int h)
 {
-    Wmv2Context * const w= (Wmv2Context*)s;
-
-    if (s->pict_type == I_TYPE) {
-        if(w->j_type_bit) w->j_type= get_bits1(&s->gb);
-        else              w->j_type= 0; //FIXME check
-
-        if(!w->j_type){
-            if(w->per_mb_rl_bit) 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;
-        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 j_type:%d \n",
-               s->qscale,
-               s->rl_chroma_table_index,
-               s->rl_table_index,
-               s->dc_table_index,
-                s->per_mb_rl_table,
-                w->j_type);
-        }
-    }else{
-        int cbp_index;
-        w->j_type=0;
-
-        parse_mb_skip(w);
-        cbp_index= decode012(&s->gb);
-        if(s->qscale <= 10){
-            int map[3]= {0,2,1};
-            w->cbp_table_index= map[cbp_index];
-        }else if(s->qscale <= 20){
-            int map[3]= {1,0,2};
-            w->cbp_table_index= map[cbp_index];
-        }else{
-            int map[3]= {2,1,0};
-            w->cbp_table_index= map[cbp_index];
-        }
-
-        if(w->mspel_bit) s->mspel= get_bits1(&s->gb);
-        else             s->mspel= 0; //FIXME check
-
-        if(w->abt_flag){
-            w->per_mb_abt= get_bits1(&s->gb)^1;
-            if(!w->per_mb_abt){
-                w->abt_type= decode012(&s->gb);
-            }
-        }
-
-        if(w->per_mb_rl_bit) 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= 0;//(s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
-        s->no_rounding ^= 1;
-
-        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
-            av_log(s->avctx, AV_LOG_DEBUG, "rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d mspel:%d per_mb_abt:%d abt_type:%d cbp:%d ii:%d\n",
-               s->rl_table_index,
-               s->rl_chroma_table_index,
-               s->dc_table_index,
-               s->mv_table_index,
-                s->per_mb_rl_table,
-                s->qscale,
-                s->mspel,
-                w->per_mb_abt,
-                w->abt_type,
-                w->cbp_table_index,
-                s->inter_intra_pred);
-        }
-    }
-    s->esc3_level_length= 0;
-    s->esc3_run_length= 0;
-
-s->picture_number++; //FIXME ?
-
-
-//    if(w->j_type)
-//        return wmv2_decode_j_picture(w); //FIXME
-
-    if(w->j_type){
-        av_log(s->avctx, AV_LOG_ERROR, "J-type picture is not supported\n");
-        return -1;
-    }
-
-    return 0;
-}
-
-static inline int wmv2_decode_motion(Wmv2Context *w, int *mx_ptr, int *my_ptr){
-    MpegEncContext * const s= &w->s;
-    int ret;
-
-    ret= msmpeg4_decode_motion(s, mx_ptr, my_ptr);
-
-    if(ret<0) return -1;
-
-    if((((*mx_ptr)|(*my_ptr)) & 1) && s->mspel)
-        w->hshift= get_bits1(&s->gb);
-    else
-        w->hshift= 0;
-
-//printf("%d %d  ", *mx_ptr, *my_ptr);
-
-    return 0;
-}
-
-static int16_t *wmv2_pred_motion(Wmv2Context *w, int *px, int *py){
-    MpegEncContext * const s= &w->s;
-    int xy, wrap, diff, type;
-    int16_t *A, *B, *C, *mot_val;
-
-    wrap = s->b8_stride;
-    xy = s->block_index[0];
-
-    mot_val = s->current_picture.motion_val[0][xy];
-
-    A = s->current_picture.motion_val[0][xy - 1];
-    B = s->current_picture.motion_val[0][xy - wrap];
-    C = s->current_picture.motion_val[0][xy + 2 - wrap];
-
-    if(s->mb_x && !s->first_slice_line && !s->mspel && w->top_left_mv_flag)
-        diff= FFMAX(ABS(A[0] - B[0]), ABS(A[1] - B[1]));
-    else
-        diff=0;
-
-    if(diff >= 8)
-        type= get_bits1(&s->gb);
-    else
-        type= 2;
-
-    if(type == 0){
-        *px= A[0];
-        *py= A[1];
-    }else if(type == 1){
-        *px= B[0];
-        *py= B[1];
-    }else{
-        /* special case for first (slice) line */
-        if (s->first_slice_line) {
-            *px = A[0];
-            *py = A[1];
-        } else {
-            *px = mid_pred(A[0], B[0], C[0]);
-            *py = mid_pred(A[1], B[1], C[1]);
-        }
-    }
-
-    return mot_val;
-}
-
-static inline int wmv2_decode_inter_block(Wmv2Context *w, DCTELEM *block, int n, int cbp){
-    MpegEncContext * const s= &w->s;
-    static const int sub_cbp_table[3]= {2,3,1};
-    int sub_cbp;
-
-    if(!cbp){
-        s->block_last_index[n] = -1;
-
-        return 0;
-    }
-
-    if(w->per_block_abt)
-        w->abt_type= decode012(&s->gb);
-#if 0
-    if(w->per_block_abt)
-        printf("B%d", w->abt_type);
-#endif
-    w->abt_type_table[n]= w->abt_type;
-
-    if(w->abt_type){
-//        const uint8_t *scantable= w->abt_scantable[w->abt_type-1].permutated;
-        const uint8_t *scantable= w->abt_scantable[w->abt_type-1].scantable;
-//        const uint8_t *scantable= w->abt_type-1 ? w->abt_scantable[1].permutated : w->abt_scantable[0].scantable;
-
-        sub_cbp= sub_cbp_table[ decode012(&s->gb) ];
-//        printf("S%d", sub_cbp);
-
-        if(sub_cbp&1){
-            if (msmpeg4_decode_block(s, block, n, 1, scantable) < 0)
-                return -1;
-        }
-
-        if(sub_cbp&2){
-            if (msmpeg4_decode_block(s, w->abt_block2[n], n, 1, scantable) < 0)
-                return -1;
-        }
-        s->block_last_index[n] = 63;
-
-        return 0;
-    }else{
-        return msmpeg4_decode_block(s, block, n, 1, s->inter_scantable.permutated);
-    }
-}
-
-static void wmv2_add_block(Wmv2Context *w, DCTELEM *block1, uint8_t *dst, int stride, int n){
-    MpegEncContext * const s= &w->s;
-
-  if (s->block_last_index[n] >= 0) {
-    switch(w->abt_type_table[n]){
-    case 0:
-        s->dsp.idct_add (dst, stride, block1);
-        break;
-    case 1:
-        simple_idct84_add(dst           , stride, block1);
-        simple_idct84_add(dst + 4*stride, stride, w->abt_block2[n]);
-        memset(w->abt_block2[n], 0, 64*sizeof(DCTELEM));
-        break;
-    case 2:
-        simple_idct48_add(dst           , stride, block1);
-        simple_idct48_add(dst + 4       , stride, w->abt_block2[n]);
-        memset(w->abt_block2[n], 0, 64*sizeof(DCTELEM));
-        break;
-    default:
-        av_log(s->avctx, AV_LOG_ERROR, "internal error in WMV2 abt\n");
-    }
-  }
-}
-
-void ff_wmv2_add_mb(MpegEncContext *s, DCTELEM block1[6][64], uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr){
-    Wmv2Context * const w= (Wmv2Context*)s;
-
-    wmv2_add_block(w, block1[0], dest_y                    , s->linesize, 0);
-    wmv2_add_block(w, block1[1], dest_y + 8                , s->linesize, 1);
-    wmv2_add_block(w, block1[2], dest_y +     8*s->linesize, s->linesize, 2);
-    wmv2_add_block(w, block1[3], dest_y + 8 + 8*s->linesize, s->linesize, 3);
-
-    if(s->flags&CODEC_FLAG_GRAY) return;
-
-    wmv2_add_block(w, block1[4], dest_cb                   , s->uvlinesize, 4);
-    wmv2_add_block(w, block1[5], dest_cr                   , s->uvlinesize, 5);
-}
-
-void ff_mspel_motion(MpegEncContext *s,
-                               uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,
-                               uint8_t **ref_picture, op_pixels_func (*pix_op)[4],
-                               int motion_x, int motion_y, int h)
-{
-    Wmv2Context * const w= (Wmv2Context*)s;
+    Wmv2Context *const w = (Wmv2Context *) s;
     uint8_t *ptr;
-    int dxy, offset, mx, my, src_x, src_y, v_edge_pos, linesize, uvlinesize;
-    int emu=0;
+    int dxy, mx, my, src_x, src_y, v_edge_pos;
+    ptrdiff_t offset, linesize, uvlinesize;
+    int emu = 0;
 
-    dxy = ((motion_y & 1) << 1) | (motion_x & 1);
-    dxy = 2*dxy + w->hshift;
+    dxy   = ((motion_y & 1) << 1) | (motion_x & 1);
+    dxy   = 2 * dxy + w->hshift;
     src_x = s->mb_x * 16 + (motion_x >> 1);
     src_y = s->mb_y * 16 + (motion_y >> 1);
 
     /* WARNING: do no forget half pels */
     v_edge_pos = s->v_edge_pos;
-    src_x = clip(src_x, -16, s->width);
-    src_y = clip(src_y, -16, s->height);
-    linesize   = s->linesize;
-    uvlinesize = s->uvlinesize;
-    ptr = ref_picture[0] + (src_y * linesize) + src_x;
-
-    if(s->flags&CODEC_FLAG_EMU_EDGE){
-        if(src_x<1 || src_y<1 || src_x + 17  >= s->h_edge_pos
-                              || src_y + h+1 >= v_edge_pos){
-            ff_emulated_edge_mc(s->edge_emu_buffer, ptr - 1 - s->linesize, s->linesize, 19, 19,
-                             src_x-1, src_y-1, s->h_edge_pos, s->v_edge_pos);
-            ptr= s->edge_emu_buffer + 1 + s->linesize;
-            emu=1;
-        }
-    }
-
-    s->dsp.put_mspel_pixels_tab[dxy](dest_y             , ptr             , linesize);
-    s->dsp.put_mspel_pixels_tab[dxy](dest_y+8           , ptr+8           , linesize);
-    s->dsp.put_mspel_pixels_tab[dxy](dest_y  +8*linesize, ptr  +8*linesize, linesize);
-    s->dsp.put_mspel_pixels_tab[dxy](dest_y+8+8*linesize, ptr+8+8*linesize, linesize);
+    src_x      = av_clip(src_x, -16, s->width);
+    src_y      = av_clip(src_y, -16, s->height);
 
-    if(s->flags&CODEC_FLAG_GRAY) return;
+    if (src_x <= -16 || src_x >= s->width)
+        dxy &= ~3;
+    if (src_y <= -16 || src_y >= s->height)
+        dxy &= ~4;
 
-    if (s->out_format == FMT_H263) {
-        dxy = 0;
-        if ((motion_x & 3) != 0)
-            dxy |= 1;
-        if ((motion_y & 3) != 0)
-            dxy |= 2;
-        mx = motion_x >> 2;
-        my = motion_y >> 2;
-    } else {
-        mx = motion_x / 2;
-        my = motion_y / 2;
-        dxy = ((my & 1) << 1) | (mx & 1);
-        mx >>= 1;
-        my >>= 1;
-    }
+    linesize   = s->linesize;
+    uvlinesize = s->uvlinesize;
+    ptr        = ref_picture[0] + (src_y * linesize) + src_x;
+
+    if (src_x < 1 || src_y < 1 || src_x + 17 >= s->h_edge_pos ||
+        src_y + h + 1 >= v_edge_pos) {
+        s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, ptr - 1 - s->linesize,
+                                 s->linesize, s->linesize, 19, 19,
+                                 src_x - 1, src_y - 1,
+                                 s->h_edge_pos, s->v_edge_pos);
+        ptr = s->sc.edge_emu_buffer + 1 + s->linesize;
+        emu = 1;
+    }
+
+    w->wdsp.put_mspel_pixels_tab[dxy](dest_y,                    ptr,                    linesize);
+    w->wdsp.put_mspel_pixels_tab[dxy](dest_y     + 8,            ptr     + 8,            linesize);
+    w->wdsp.put_mspel_pixels_tab[dxy](dest_y     + 8 * linesize, ptr     + 8 * linesize, linesize);
+    w->wdsp.put_mspel_pixels_tab[dxy](dest_y + 8 + 8 * linesize, ptr + 8 + 8 * linesize, linesize);
+
+    if (s->avctx->flags & AV_CODEC_FLAG_GRAY)
+        return;
+
+    dxy = 0;
+    if ((motion_x & 3) != 0)
+        dxy |= 1;
+    if ((motion_y & 3) != 0)
+        dxy |= 2;
+    mx = motion_x >> 2;
+    my = motion_y >> 2;
 
     src_x = s->mb_x * 8 + mx;
     src_y = s->mb_y * 8 + my;
-    src_x = clip(src_x, -8, s->width >> 1);
+    src_x = av_clip(src_x, -8, s->width >> 1);
     if (src_x == (s->width >> 1))
         dxy &= ~1;
-    src_y = clip(src_y, -8, s->height >> 1);
+    src_y = av_clip(src_y, -8, s->height >> 1);
     if (src_y == (s->height >> 1))
         dxy &= ~2;
     offset = (src_y * uvlinesize) + src_x;
-    ptr = ref_picture[1] + offset;
-    if(emu){
-        ff_emulated_edge_mc(s->edge_emu_buffer, ptr, s->uvlinesize, 9, 9,
-                         src_x, src_y, s->h_edge_pos>>1, s->v_edge_pos>>1);
-        ptr= s->edge_emu_buffer;
+    ptr    = ref_picture[1] + offset;
+    if (emu) {
+        s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, ptr,
+                                 s->uvlinesize, s->uvlinesize,
+                                 9, 9,
+                                 src_x, src_y,
+                                 s->h_edge_pos >> 1, s->v_edge_pos >> 1);
+        ptr = s->sc.edge_emu_buffer;
     }
     pix_op[1][dxy](dest_cb, ptr, uvlinesize, h >> 1);
 
     ptr = ref_picture[2] + offset;
-    if(emu){
-        ff_emulated_edge_mc(s->edge_emu_buffer, ptr, s->uvlinesize, 9, 9,
-                         src_x, src_y, s->h_edge_pos>>1, s->v_edge_pos>>1);
-        ptr= s->edge_emu_buffer;
+    if (emu) {
+        s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, ptr,
+                                 s->uvlinesize, s->uvlinesize,
+                                 9, 9,
+                                 src_x, src_y,
+                                 s->h_edge_pos >> 1, s->v_edge_pos >> 1);
+        ptr = s->sc.edge_emu_buffer;
     }
     pix_op[1][dxy](dest_cr, ptr, uvlinesize, h >> 1);
 }
-
-
-static int wmv2_decode_mb(MpegEncContext *s, DCTELEM block[6][64])
-{
-    Wmv2Context * const w= (Wmv2Context*)s;
-    int cbp, code, i;
-    uint8_t *coded_val;
-
-    if(w->j_type) return 0;
-
-    if (s->pict_type == P_TYPE) {
-        if(IS_SKIP(s->current_picture.mb_type[s->mb_y * s->mb_stride + s->mb_x])){
-            /* 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;
-            w->hshift=0;
-            return 0;
-        }
-
-        code = get_vlc2(&s->gb, mb_non_intra_vlc[w->cbp_table_index].table, MB_NON_INTRA_VLC_BITS, 3);
-        if (code < 0)
-            return -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){
-            av_log(s->avctx, AV_LOG_ERROR, "II-cbp illegal at %d %d\n", s->mb_x, s->mb_y);
-            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 = coded_block_pred(s, i, &coded_val);
-                val = val ^ pred;
-                *coded_val = val;
-            }
-            cbp |= val << (5 - i);
-        }
-    }
-
-    if (!s->mb_intra) {
-        int mx, my;
-//printf("P at %d %d\n", s->mb_x, s->mb_y);
-        wmv2_pred_motion(w, &mx, &my);
-
-        if(cbp){
-            s->dsp.clear_blocks(s->block[0]);
-            if(s->per_mb_rl_table){
-                s->rl_table_index = decode012(&s->gb);
-                s->rl_chroma_table_index = s->rl_table_index;
-            }
-
-            if(w->abt_flag && w->per_mb_abt){
-                w->per_block_abt= get_bits1(&s->gb);
-                if(!w->per_block_abt)
-                    w->abt_type= decode012(&s->gb);
-            }else
-                w->per_block_abt=0;
-        }
-
-        if (wmv2_decode_motion(w, &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;
-
-        for (i = 0; i < 6; i++) {
-            if (wmv2_decode_inter_block(w, block[i], i, (cbp >> (5 - i)) & 1) < 0)
-           {
-               av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding inter block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
-               return -1;
-           }
-        }
-    } else {
-//if(s->pict_type==P_TYPE)
-//   printf("%d%d ", s->inter_intra_pred, cbp);
-//printf("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);
-        if(s->inter_intra_pred){
-            s->h263_aic_dir= get_vlc2(&s->gb, inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1);
-//            printf("%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 (msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
-           {
-               av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding intra block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
-               return -1;
-           }
-        }
-    }
-
-    return 0;
-}
-
-static int wmv2_decode_init(AVCodecContext *avctx){
-    Wmv2Context * const w= avctx->priv_data;
-
-    if(ff_h263_decode_init(avctx) < 0)
-        return -1;
-
-    wmv2_common_init(w);
-
-    return 0;
-}
-
-AVCodec wmv2_decoder = {
-    "wmv2",
-    CODEC_TYPE_VIDEO,
-    CODEC_ID_WMV2,
-    sizeof(Wmv2Context),
-    wmv2_decode_init,
-    NULL,
-    ff_h263_decode_end,
-    ff_h263_decode_frame,
-    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
-};
-
-#ifdef CONFIG_ENCODERS
-AVCodec wmv2_encoder = {
-    "wmv2",
-    CODEC_TYPE_VIDEO,
-    CODEC_ID_WMV2,
-    sizeof(Wmv2Context),
-    wmv2_encode_init,
-    MPV_encode_picture,
-    MPV_encode_end,
-};
-#endif