libavcodec/wmv2.c

   1 /*
   2  * Copyright (c) 2002 The Libav Project
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * Libav is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with Libav; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include "avcodec.h"
  22 #include "mpegvideo.h"
  23 #include "msmpeg4data.h"
  24 #include "simple_idct.h"
  25 #include "wmv2.h"
  26
  27
  28 av_cold void ff_wmv2_common_init(Wmv2Context * w){
  29     MpegEncContext * const s= &w->s;
  30
  31     ff_wmv2dsp_init(&w->wdsp);
  32     s->dsp.idct_permutation_type = w->wdsp.idct_perm;
  33     ff_init_scantable_permutation(s->dsp.idct_permutation,
  34                                   w->wdsp.idct_perm);
  35     ff_init_scantable(s->dsp.idct_permutation, &w->abt_scantable[0],
  36                       ff_wmv2_scantableA);
  37     ff_init_scantable(s->dsp.idct_permutation, &w->abt_scantable[1],
  38                       ff_wmv2_scantableB);
  39     ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable,
  40                       ff_wmv1_scantable[1]);
  41     ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable,
  42                       ff_wmv1_scantable[2]);
  43     ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable,
  44                       ff_wmv1_scantable[3]);
  45     ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable,
  46                       ff_wmv1_scantable[0]);
  47     s->dsp.idct_put = w->wdsp.idct_put;
  48     s->dsp.idct_add = w->wdsp.idct_add;
  49     s->dsp.idct     = NULL;
  50 }
  51
  52 static void wmv2_add_block(Wmv2Context *w, int16_t *block1, uint8_t *dst, int stride, int n){
  53     MpegEncContext * const s= &w->s;
  54
  55   if (s->block_last_index[n] >= 0) {
  56     switch(w->abt_type_table[n]){
  57     case 0:
  58         w->wdsp.idct_add(dst, stride, block1);
  59         break;
  60     case 1:
  61         ff_simple_idct84_add(dst           , stride, block1);
  62         ff_simple_idct84_add(dst + 4*stride, stride, w->abt_block2[n]);
  63         s->dsp.clear_block(w->abt_block2[n]);
  64         break;
  65     case 2:
  66         ff_simple_idct48_add(dst           , stride, block1);
  67         ff_simple_idct48_add(dst + 4       , stride, w->abt_block2[n]);
  68         s->dsp.clear_block(w->abt_block2[n]);
  69         break;
  70     default:
  71         av_log(s->avctx, AV_LOG_ERROR, "internal error in WMV2 abt\n");
  72     }
  73   }
  74 }
  75
  76 void ff_wmv2_add_mb(MpegEncContext *s, int16_t block1[6][64], uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr){
  77     Wmv2Context * const w= (Wmv2Context*)s;
  78
  79     wmv2_add_block(w, block1[0], dest_y                    , s->linesize, 0);
  80     wmv2_add_block(w, block1[1], dest_y + 8                , s->linesize, 1);
  81     wmv2_add_block(w, block1[2], dest_y +     8*s->linesize, s->linesize, 2);
  82     wmv2_add_block(w, block1[3], dest_y + 8 + 8*s->linesize, s->linesize, 3);
  83
  84     if(s->flags&CODEC_FLAG_GRAY) return;
  85
  86     wmv2_add_block(w, block1[4], dest_cb                   , s->uvlinesize, 4);
  87     wmv2_add_block(w, block1[5], dest_cr                   , s->uvlinesize, 5);
  88 }
  89
  90 void ff_mspel_motion(MpegEncContext *s,
  91                                uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,
  92                                uint8_t **ref_picture, op_pixels_func (*pix_op)[4],
  93                                int motion_x, int motion_y, int h)
  94 {
  95     Wmv2Context * const w= (Wmv2Context*)s;
  96     uint8_t *ptr;
  97     int dxy, offset, mx, my, src_x, src_y, v_edge_pos, linesize, uvlinesize;
  98     int emu=0;
  99
 100     dxy = ((motion_y & 1) << 1) | (motion_x & 1);
 101     dxy = 2*dxy + w->hshift;
 102     src_x = s->mb_x * 16 + (motion_x >> 1);
 103     src_y = s->mb_y * 16 + (motion_y >> 1);
 104
 105     /* WARNING: do no forget half pels */
 106     v_edge_pos = s->v_edge_pos;
 107     src_x = av_clip(src_x, -16, s->width);
 108     src_y = av_clip(src_y, -16, s->height);
 109
 110     if(src_x<=-16 || src_x >= s->width)
 111         dxy &= ~3;
 112     if(src_y<=-16 || src_y >= s->height)
 113         dxy &= ~4;
 114
 115     linesize   = s->linesize;
 116     uvlinesize = s->uvlinesize;
 117     ptr = ref_picture[0] + (src_y * linesize) + src_x;
 118
 119     if(s->flags&CODEC_FLAG_EMU_EDGE){
 120         if(src_x<1 || src_y<1 || src_x + 17  >= s->h_edge_pos
 121                               || src_y + h+1 >= v_edge_pos){
 122             s->vdsp.emulated_edge_mc(s->edge_emu_buffer, ptr - 1 - s->linesize, s->linesize, 19, 19,
 123                              src_x-1, src_y-1, s->h_edge_pos, s->v_edge_pos);
 124             ptr= s->edge_emu_buffer + 1 + s->linesize;
 125             emu=1;
 126         }
 127     }
 128
 129     s->dsp.put_mspel_pixels_tab[dxy](dest_y             , ptr             , linesize);
 130     s->dsp.put_mspel_pixels_tab[dxy](dest_y+8           , ptr+8           , linesize);
 131     s->dsp.put_mspel_pixels_tab[dxy](dest_y  +8*linesize, ptr  +8*linesize, linesize);
 132     s->dsp.put_mspel_pixels_tab[dxy](dest_y+8+8*linesize, ptr+8+8*linesize, linesize);
 133
 134     if(s->flags&CODEC_FLAG_GRAY) return;
 135
 136     if (s->out_format == FMT_H263) {
 137         dxy = 0;
 138         if ((motion_x & 3) != 0)
 139             dxy |= 1;
 140         if ((motion_y & 3) != 0)
 141             dxy |= 2;
 142         mx = motion_x >> 2;
 143         my = motion_y >> 2;
 144     } else {
 145         mx = motion_x / 2;
 146         my = motion_y / 2;
 147         dxy = ((my & 1) << 1) | (mx & 1);
 148         mx >>= 1;
 149         my >>= 1;
 150     }
 151
 152     src_x = s->mb_x * 8 + mx;
 153     src_y = s->mb_y * 8 + my;
 154     src_x = av_clip(src_x, -8, s->width >> 1);
 155     if (src_x == (s->width >> 1))
 156         dxy &= ~1;
 157     src_y = av_clip(src_y, -8, s->height >> 1);
 158     if (src_y == (s->height >> 1))
 159         dxy &= ~2;
 160     offset = (src_y * uvlinesize) + src_x;
 161     ptr = ref_picture[1] + offset;
 162     if(emu){
 163         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, ptr, s->uvlinesize, 9, 9,
 164                          src_x, src_y, s->h_edge_pos>>1, s->v_edge_pos>>1);
 165         ptr= s->edge_emu_buffer;
 166     }
 167     pix_op[1][dxy](dest_cb, ptr, uvlinesize, h >> 1);
 168
 169     ptr = ref_picture[2] + offset;
 170     if(emu){
 171         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, ptr, s->uvlinesize, 9, 9,
 172                          src_x, src_y, s->h_edge_pos>>1, s->v_edge_pos>>1);
 173         ptr= s->edge_emu_buffer;
 174     }
 175     pix_op[1][dxy](dest_cr, ptr, uvlinesize, h >> 1);
 176 }