/*

  * 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 "mpegvideo.h"
 #include "msmpeg4data.h"

 #include "simple_idct.h"

 #include "wmv2.h"

 av_cold void ff_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);

 }
 
 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:

         ff_simple_idct84_add(dst           , stride, block1);
         ff_simple_idct84_add(dst + 4*stride, stride, w->abt_block2[n]);

         s->dsp.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->dsp.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, 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;

     uint8_t *ptr;

     int dxy, offset, mx, my, src_x, src_y, v_edge_pos, linesize, uvlinesize;
     int emu=0;

     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 = av_clip(src_x, -16, s->width);
     src_y = av_clip(src_y, -16, s->height);

 
     if(src_x<=-16 || src_x >= s->width)
         dxy &= ~3;
     if(src_y<=-16 || src_y >= s->height)
         dxy &= ~4;
 

     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){

             s->dsp.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);
 
     if(s->flags&CODEC_FLAG_GRAY) return;
 
     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;
     }

     src_x = s->mb_x * 8 + mx;
     src_y = s->mb_y * 8 + my;

     src_x = av_clip(src_x, -8, s->width >> 1);

     if (src_x == (s->width >> 1))
         dxy &= ~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){

         s->dsp.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;
     }
     pix_op[1][dxy](dest_cb, ptr, uvlinesize, h >> 1);
 
     ptr = ref_picture[2] + offset;
     if(emu){

         s->dsp.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;
     }
     pix_op[1][dxy](dest_cr, ptr, uvlinesize, h >> 1);
 }