split wmv2 encoder and decoder in their own files

Originally committed as revision 11091 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/Makefile

@@ -210,8 +210,8 @@ OBJS-$(CONFIG_WMAV1_ENCODER)           += wmaenc.o wma.o mdct.o fft.o
 OBJS-$(CONFIG_WMAV2_ENCODER)           += wmaenc.o wma.o mdct.o fft.o
 OBJS-$(CONFIG_WMV1_DECODER)            += h263dec.o h263.o
 OBJS-$(CONFIG_WMV1_ENCODER)            += mpegvideo_enc.o motion_est.o ratecontrol.o h263.o
-OBJS-$(CONFIG_WMV2_DECODER)            += wmv2.o msmpeg4.o msmpeg4data.o h263dec.o h263.o intrax8.o intrax8dsp.o
-OBJS-$(CONFIG_WMV2_ENCODER)            += wmv2.o msmpeg4.o msmpeg4data.o mpegvideo_enc.o motion_est.o ratecontrol.o h263.o intrax8.o intrax8dsp.o
+OBJS-$(CONFIG_WMV2_DECODER)            += wmv2dec.o wmv2.o msmpeg4.o msmpeg4data.o h263dec.o h263.o intrax8.o intrax8dsp.o
+OBJS-$(CONFIG_WMV2_ENCODER)            += wmv2enc.o wmv2.o msmpeg4.o msmpeg4data.o mpegvideo_enc.o motion_est.o ratecontrol.o h263.o
 OBJS-$(CONFIG_WMV3_DECODER)            += vc1.o vc1data.o vc1dsp.o
 OBJS-$(CONFIG_WNV1_DECODER)            += wnv1.o
 OBJS-$(CONFIG_WS_SND1_DECODER)         += ws-snd1.o

libavcodec/wmv2.h

+/*
+ * Copyright (c) 2002 The FFmpeg Project.
+ *
+ * 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
+ */
+
+#ifndef FFMPEG_WMV2_H
+#define FFMPEG_WMV2_H
+
+#include "avcodec.h"
+#include "dsputil.h"
+#include "mpegvideo.h"
+#include "intrax8.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;
+    IntraX8Context x8;
+    int j_type_bit;
+    int j_type;
+    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];
+    DECLARE_ALIGNED_8(DCTELEM, abt_block2[6][64]);
+}Wmv2Context;
+
+void ff_wmv2_common_init(Wmv2Context * w);
+
+#endif /* FFMPEG_WMV2_H */

libavcodec/wmv2dec.c

+/*
+ * Copyright (c) 2002 The FFmpeg Project.
+ *
+ * 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 "avcodec.h"
+#include "dsputil.h"
+#include "mpegvideo.h"
+#include "msmpeg4.h"
+#include "msmpeg4data.h"
+#include "intrax8.h"
+#include "wmv2.h"
+
+
+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);
+    s->loop_filter     = 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, loop_filter:%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, s->loop_filter,
+        code);
+    }
+    return 0;
+}
+
+int ff_wmv2_decode_picture_header(MpegEncContext * s)
+{
+    Wmv2Context * const w= (Wmv2Context*)s;
+    int code;
+
+#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);
+
+    s->pict_type = get_bits1(&s->gb) + 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;
+
+    return 0;
+}
+
+int ff_wmv2_decode_secondary_picture_header(MpegEncContext * s)
+{
+    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){
+        ff_intrax8_decode_picture(&w->x8, 2*s->qscale, (s->qscale-1)|1 );
+        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= ff_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(FFABS(A[0] - B[0]), FFABS(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 (ff_msmpeg4_decode_block(s, block, n, 1, scantable) < 0)
+                return -1;
+        }
+
+        if(sub_cbp&2){
+            if (ff_msmpeg4_decode_block(s, w->abt_block2[n], n, 1, scantable) < 0)
+                return -1;
+        }
+        s->block_last_index[n] = 63;
+
+        return 0;
+    }else{
+        return ff_msmpeg4_decode_block(s, block, n, 1, s->inter_scantable.permutated);
+    }
+}
+
+
+int ff_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, ff_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 = 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;
+//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, ff_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 (ff_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(avctx->idct_algo==FF_IDCT_AUTO){
+        avctx->idct_algo=FF_IDCT_WMV2;
+    }
+
+    if(ff_h263_decode_init(avctx) < 0)
+        return -1;
+
+    ff_wmv2_common_init(w);
+
+    ff_intrax8_common_init(&w->x8,&w->s);
+
+    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,
+};

libavcodec/wmv2enc.c

+/*
+ * Copyright (c) 2002 The FFmpeg Project.
+ *
+ * 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 "avcodec.h"
+#include "dsputil.h"
+#include "mpegvideo.h"
+#include "msmpeg4.h"
+#include "msmpeg4data.h"
+#include "wmv2.h"
+
+
+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, s->loop_filter);
+    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;
+
+    ff_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)
+{
+    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){
+            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);
+
+        s->inter_intra_pred= 0;
+    }else{
+        int cbp_index;
+
+        put_bits(&s->pb, 2, SKIP_TYPE_NONE);
+
+        ff_msmpeg4_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){
+                ff_msmpeg4_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){
+            ff_msmpeg4_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 identical to wmv1 but that is just because we do not use the
+ * useless M$ crap features. It is duplicated here in case someone wants
+ * to add support for these crap features. */
+void ff_wmv2_encode_mb(MpegEncContext * s,
+                       DCTELEM block[6][64],
+                       int motion_x, int motion_y)
+{
+    Wmv2Context * const w= (Wmv2Context*)s;
+    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);
+        }
+
+        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);
+        ff_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 = ff_msmpeg4_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) {
+            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]);
+        }
+        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++) {
+        ff_msmpeg4_encode_block(s, block[i], i);
+    }
+}
+
+AVCodec wmv2_encoder = {
+    "wmv2",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_WMV2,
+    sizeof(Wmv2Context),
+    wmv2_encode_init,
+    MPV_encode_picture,
+    MPV_encode_end,
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
+};