libavcodec/wmv2.c

   1 /*
   2  * Copyright (c) 2002 The FFmpeg Project
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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_init_scantable(s->dsp.idct_permutation, &w->abt_scantable[0], wmv2_scantableA);
  32     ff_init_scantable(s->dsp.idct_permutation, &w->abt_scantable[1], wmv2_scantableB);
  33 }
  34
  35 static void wmv2_add_block(Wmv2Context *w, DCTELEM *block1, uint8_t *dst, int stride, int n){
  36     MpegEncContext * const s= &w->s;
  37
  38   if (s->block_last_index[n] >= 0) {
  39     switch(w->abt_type_table[n]){
  40     case 0:
  41         s->dsp.idct_add (dst, stride, block1);
  42         break;
  43     case 1:
  44         ff_simple_idct84_add(dst           , stride, block1);
  45         ff_simple_idct84_add(dst + 4*stride, stride, w->abt_block2[n]);
  46         s->dsp.clear_block(w->abt_block2[n]);
  47         break;
  48     case 2:
  49         ff_simple_idct48_add(dst           , stride, block1);
  50         ff_simple_idct48_add(dst + 4       , stride, w->abt_block2[n]);
  51         s->dsp.clear_block(w->abt_block2[n]);
  52         break;
  53     default:
  54         av_log(s->avctx, AV_LOG_ERROR, "internal error in WMV2 abt\n");
  55     }
  56   }
  57 }
  58
  59 void ff_wmv2_add_mb(MpegEncContext *s, DCTELEM block1[6][64], uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr){
  60     Wmv2Context * const w= (Wmv2Context*)s;
  61
  62     wmv2_add_block(w, block1[0], dest_y                    , s->linesize, 0);
  63     wmv2_add_block(w, block1[1], dest_y + 8                , s->linesize, 1);
  64     wmv2_add_block(w, block1[2], dest_y +     8*s->linesize, s->linesize, 2);
  65     wmv2_add_block(w, block1[3], dest_y + 8 + 8*s->linesize, s->linesize, 3);
  66
  67     if(s->flags&CODEC_FLAG_GRAY) return;
  68
  69     wmv2_add_block(w, block1[4], dest_cb                   , s->uvlinesize, 4);
  70     wmv2_add_block(w, block1[5], dest_cr                   , s->uvlinesize, 5);
  71 }
  72
  73 void ff_mspel_motion(MpegEncContext *s,
  74                                uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,
  75                                uint8_t **ref_picture, op_pixels_func (*pix_op)[4],
  76                                int motion_x, int motion_y, int h)
  77 {
  78     Wmv2Context * const w= (Wmv2Context*)s;
  79     uint8_t *ptr;
  80     int dxy, offset, mx, my, src_x, src_y, v_edge_pos, linesize, uvlinesize;
  81     int emu=0;
  82
  83     dxy = ((motion_y & 1) << 1) | (motion_x & 1);
  84     dxy = 2*dxy + w->hshift;
  85     src_x = s->mb_x * 16 + (motion_x >> 1);
  86     src_y = s->mb_y * 16 + (motion_y >> 1);
  87
  88     /* WARNING: do no forget half pels */
  89     v_edge_pos = s->v_edge_pos;
  90     src_x = av_clip(src_x, -16, s->width);
  91     src_y = av_clip(src_y, -16, s->height);
  92
  93     if(src_x<=-16 || src_x >= s->width)
  94         dxy &= ~3;
  95     if(src_y<=-16 || src_y >= s->height)
  96         dxy &= ~4;
  97
  98     linesize   = s->linesize;
  99     uvlinesize = s->uvlinesize;
 100     ptr = ref_picture[0] + (src_y * linesize) + src_x;
 101
 102     if(s->flags&CODEC_FLAG_EMU_EDGE){
 103         if(src_x<1 || src_y<1 || src_x + 17  >= s->h_edge_pos
 104                               || src_y + h+1 >= v_edge_pos){
 105             ff_emulated_edge_mc(s->edge_emu_buffer, ptr - 1 - s->linesize, s->linesize, 19, 19,
 106                              src_x-1, src_y-1, s->h_edge_pos, s->v_edge_pos);
 107             ptr= s->edge_emu_buffer + 1 + s->linesize;
 108             emu=1;
 109         }
 110     }
 111
 112     s->dsp.put_mspel_pixels_tab[dxy](dest_y             , ptr             , linesize);
 113     s->dsp.put_mspel_pixels_tab[dxy](dest_y+8           , ptr+8           , linesize);
 114     s->dsp.put_mspel_pixels_tab[dxy](dest_y  +8*linesize, ptr  +8*linesize, linesize);
 115     s->dsp.put_mspel_pixels_tab[dxy](dest_y+8+8*linesize, ptr+8+8*linesize, linesize);
 116
 117     if(s->flags&CODEC_FLAG_GRAY) return;
 118
 119     if (s->out_format == FMT_H263) {
 120         dxy = 0;
 121         if ((motion_x & 3) != 0)
 122             dxy |= 1;
 123         if ((motion_y & 3) != 0)
 124             dxy |= 2;
 125         mx = motion_x >> 2;
 126         my = motion_y >> 2;
 127     } else {
 128         mx = motion_x / 2;
 129         my = motion_y / 2;
 130         dxy = ((my & 1) << 1) | (mx & 1);
 131         mx >>= 1;
 132         my >>= 1;
 133     }
 134
 135     src_x = s->mb_x * 8 + mx;
 136     src_y = s->mb_y * 8 + my;
 137     src_x = av_clip(src_x, -8, s->width >> 1);
 138     if (src_x == (s->width >> 1))
 139         dxy &= ~1;
 140     src_y = av_clip(src_y, -8, s->height >> 1);
 141     if (src_y == (s->height >> 1))
 142         dxy &= ~2;
 143     offset = (src_y * uvlinesize) + src_x;
 144     ptr = ref_picture[1] + offset;
 145     if(emu){
 146         ff_emulated_edge_mc(s->edge_emu_buffer, ptr, s->uvlinesize, 9, 9,
 147                          src_x, src_y, s->h_edge_pos>>1, s->v_edge_pos>>1);
 148         ptr= s->edge_emu_buffer;
 149     }
 150     pix_op[1][dxy](dest_cb, ptr, uvlinesize, h >> 1);
 151
 152     ptr = ref_picture[2] + offset;
 153     if(emu){
 154         ff_emulated_edge_mc(s->edge_emu_buffer, ptr, s->uvlinesize, 9, 9,
 155                          src_x, src_y, s->h_edge_pos>>1, s->v_edge_pos>>1);
 156         ptr= s->edge_emu_buffer;
 157     }
 158     pix_op[1][dxy](dest_cr, ptr, uvlinesize, h >> 1);
 159 }