ffmpeg/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 "idctdsp.h"
  23 #include "mpegvideo.h"
  24 #include "msmpeg4data.h"
  25 #include "simple_idct.h"
  26 #include "wmv2.h"
  27
  28
  29 av_cold void ff_wmv2_common_init(Wmv2Context *w)
  30 {
  31     MpegEncContext *const s = &w->s;
  32
  33     ff_blockdsp_init(&s->bdsp, s->avctx);
  34     ff_wmv2dsp_init(&w->wdsp);
  35     s->idsp.perm_type = w->wdsp.idct_perm;
  36     ff_init_scantable_permutation(s->idsp.idct_permutation,
  37                                   w->wdsp.idct_perm);
  38     ff_init_scantable(s->idsp.idct_permutation, &w->abt_scantable[0],
  39                       ff_wmv2_scantableA);
  40     ff_init_scantable(s->idsp.idct_permutation, &w->abt_scantable[1],
  41                       ff_wmv2_scantableB);
  42     ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable,
  43                       ff_wmv1_scantable[1]);
  44     ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable,
  45                       ff_wmv1_scantable[2]);
  46     ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable,
  47                       ff_wmv1_scantable[3]);
  48     ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable,
  49                       ff_wmv1_scantable[0]);
  50     s->idsp.idct_put = w->wdsp.idct_put;
  51     s->idsp.idct_add = w->wdsp.idct_add;
  52     s->idsp.idct     = NULL;
  53 }
  54
  55 static void wmv2_add_block(Wmv2Context *w, int16_t *block1,
  56                            uint8_t *dst, int stride, int n)
  57 {
  58     MpegEncContext *const s = &w->s;
  59
  60     if (s->block_last_index[n] >= 0) {
  61         switch (w->abt_type_table[n]) {
  62         case 0:
  63             w->wdsp.idct_add(dst, stride, block1);
  64             break;
  65         case 1:
  66             ff_simple_idct84_add(dst, stride, block1);
  67             ff_simple_idct84_add(dst + 4 * stride, stride, w->abt_block2[n]);
  68             s->bdsp.clear_block(w->abt_block2[n]);
  69             break;
  70         case 2:
  71             ff_simple_idct48_add(dst, stride, block1);
  72             ff_simple_idct48_add(dst + 4, stride, w->abt_block2[n]);
  73             s->bdsp.clear_block(w->abt_block2[n]);
  74             break;
  75         default:
  76             av_log(s->avctx, AV_LOG_ERROR, "internal error in WMV2 abt\n");
  77         }
  78     }
  79 }
  80
  81 void ff_wmv2_add_mb(MpegEncContext *s, int16_t block1[6][64],
  82                     uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr)
  83 {
  84     Wmv2Context *const w = (Wmv2Context *) s;
  85
  86     wmv2_add_block(w, block1[0], dest_y,                       s->linesize, 0);
  87     wmv2_add_block(w, block1[1], dest_y + 8,                   s->linesize, 1);
  88     wmv2_add_block(w, block1[2], dest_y + 8 * s->linesize,     s->linesize, 2);
  89     wmv2_add_block(w, block1[3], dest_y + 8 + 8 * s->linesize, s->linesize, 3);
  90
  91     if (s->flags & CODEC_FLAG_GRAY)
  92         return;
  93
  94     wmv2_add_block(w, block1[4], dest_cb, s->uvlinesize, 4);
  95     wmv2_add_block(w, block1[5], dest_cr, s->uvlinesize, 5);
  96 }
  97
  98 void ff_mspel_motion(MpegEncContext *s, uint8_t *dest_y,
  99                      uint8_t *dest_cb, uint8_t *dest_cr,
 100                      uint8_t **ref_picture, op_pixels_func (*pix_op)[4],
 101                      int motion_x, int motion_y, int h)
 102 {
 103     Wmv2Context *const w = (Wmv2Context *) s;
 104     uint8_t *ptr;
 105     int dxy, mx, my, src_x, src_y, v_edge_pos;
 106     ptrdiff_t offset, linesize, uvlinesize;
 107     int emu = 0;
 108
 109     dxy   = ((motion_y & 1) << 1) | (motion_x & 1);
 110     dxy   = 2 * dxy + w->hshift;
 111     src_x = s->mb_x * 16 + (motion_x >> 1);
 112     src_y = s->mb_y * 16 + (motion_y >> 1);
 113
 114     /* WARNING: do no forget half pels */
 115     v_edge_pos = s->v_edge_pos;
 116     src_x      = av_clip(src_x, -16, s->width);
 117     src_y      = av_clip(src_y, -16, s->height);
 118
 119     if (src_x <= -16 || src_x >= s->width)
 120         dxy &= ~3;
 121     if (src_y <= -16 || src_y >= s->height)
 122         dxy &= ~4;
 123
 124     linesize   = s->linesize;
 125     uvlinesize = s->uvlinesize;
 126     ptr        = ref_picture[0] + (src_y * linesize) + src_x;
 127
 128     if (src_x < 1 || src_y < 1 || src_x + 17 >= s->h_edge_pos ||
 129         src_y + h + 1 >= v_edge_pos) {
 130         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, ptr - 1 - s->linesize,
 131                                  s->linesize, s->linesize, 19, 19,
 132                                  src_x - 1, src_y - 1,
 133                                  s->h_edge_pos, s->v_edge_pos);
 134         ptr = s->edge_emu_buffer + 1 + s->linesize;
 135         emu = 1;
 136     }
 137
 138     w->wdsp.put_mspel_pixels_tab[dxy](dest_y,                    ptr,                    linesize);
 139     w->wdsp.put_mspel_pixels_tab[dxy](dest_y     + 8,            ptr     + 8,            linesize);
 140     w->wdsp.put_mspel_pixels_tab[dxy](dest_y     + 8 * linesize, ptr     + 8 * linesize, linesize);
 141     w->wdsp.put_mspel_pixels_tab[dxy](dest_y + 8 + 8 * linesize, ptr + 8 + 8 * linesize, linesize);
 142
 143     if (s->flags & CODEC_FLAG_GRAY)
 144         return;
 145
 146     dxy = 0;
 147     if ((motion_x & 3) != 0)
 148         dxy |= 1;
 149     if ((motion_y & 3) != 0)
 150         dxy |= 2;
 151     mx = motion_x >> 2;
 152     my = motion_y >> 2;
 153
 154     src_x = s->mb_x * 8 + mx;
 155     src_y = s->mb_y * 8 + my;
 156     src_x = av_clip(src_x, -8, s->width >> 1);
 157     if (src_x == (s->width >> 1))
 158         dxy &= ~1;
 159     src_y = av_clip(src_y, -8, s->height >> 1);
 160     if (src_y == (s->height >> 1))
 161         dxy &= ~2;
 162     offset = (src_y * uvlinesize) + src_x;
 163     ptr    = ref_picture[1] + offset;
 164     if (emu) {
 165         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, ptr,
 166                                  s->uvlinesize, s->uvlinesize,
 167                                  9, 9,
 168                                  src_x, src_y,
 169                                  s->h_edge_pos >> 1, s->v_edge_pos >> 1);
 170         ptr = s->edge_emu_buffer;
 171     }
 172     pix_op[1][dxy](dest_cb, ptr, uvlinesize, h >> 1);
 173
 174     ptr = ref_picture[2] + offset;
 175     if (emu) {
 176         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, ptr,
 177                                  s->uvlinesize, s->uvlinesize,
 178                                  9, 9,
 179                                  src_x, src_y,
 180                                  s->h_edge_pos >> 1, s->v_edge_pos >> 1);
 181         ptr = s->edge_emu_buffer;
 182     }
 183     pix_op[1][dxy](dest_cr, ptr, uvlinesize, h >> 1);
 184 }