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