/*

  * 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 "h263.h"

 #include "mathops.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->f.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, 32);

 
     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(s->picture_number==0)
         decode_ext_header(w);
 
     s->pict_type = get_bits1(&s->gb) + 1;

     if(s->pict_type == AV_PICTURE_TYPE_I){

         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 == AV_PICTURE_TYPE_I) {

         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;
 
     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.f.motion_val[0][xy];

     A = s->current_picture.f.motion_val[0][xy - 1];
     B = s->current_picture.f.motion_val[0][xy - wrap];
     C = s->current_picture.f.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);
     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) ];
 
         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 == AV_PICTURE_TYPE_P) {

         if (IS_SKIP(s->current_picture.f.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;
         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==AV_PICTURE_TYPE_P)
             av_dlog(s->avctx, "%d%d ", s->inter_intra_pred, cbp);
         av_dlog(s->avctx, "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);

             av_dlog(s->avctx, "%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 av_cold 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_msmpeg4_decode_init(avctx) < 0)

         return -1;
 
     ff_wmv2_common_init(w);
 
     ff_intrax8_common_init(&w->x8,&w->s);
 
     return 0;
 }
 

 static av_cold int wmv2_decode_end(AVCodecContext *avctx)

 {
     Wmv2Context *w = avctx->priv_data;
 
     ff_intrax8_common_end(&w->x8);
     return ff_h263_decode_end(avctx);
 }
 

 AVCodec ff_wmv2_decoder = {

     .name           = "wmv2",
     .type           = AVMEDIA_TYPE_VIDEO,

     .id             = AV_CODEC_ID_WMV2,

     .priv_data_size = sizeof(Wmv2Context),
     .init           = wmv2_decode_init,
     .close          = wmv2_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 8"),
     .pix_fmts       = ff_pixfmt_list_420,

 };