/*

  * 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 "idctdsp.h"

 #include "mpegutils.h"

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

 #include "simple_idct.h"

 #include "wmv2.h"

 #include "wmv2data.h"

 av_cold void ff_wmv2_common_init(Wmv2Context *w)
 {
     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)
 {
     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;

     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->avctx->flags & AV_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, 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;

     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 (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 = 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->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) {

         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);
 }