FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
wmv2.c
Go to the documentation of this file.
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_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, mx, my, src_x, src_y, v_edge_pos;
98  ptrdiff_t offset, linesize, uvlinesize;
99  int emu=0;
100 
101  dxy = ((motion_y & 1) << 1) | (motion_x & 1);
102  dxy = 2*dxy + w->hshift;
103  src_x = s->mb_x * 16 + (motion_x >> 1);
104  src_y = s->mb_y * 16 + (motion_y >> 1);
105 
106  /* WARNING: do no forget half pels */
107  v_edge_pos = s->v_edge_pos;
108  src_x = av_clip(src_x, -16, s->width);
109  src_y = av_clip(src_y, -16, s->height);
110 
111  if(src_x<=-16 || src_x >= s->width)
112  dxy &= ~3;
113  if(src_y<=-16 || src_y >= s->height)
114  dxy &= ~4;
115 
116  linesize = s->linesize;
117  uvlinesize = s->uvlinesize;
118  ptr = ref_picture[0] + (src_y * linesize) + src_x;
119 
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,
123  ptr - 1 - s->linesize,
124  s->linesize, s->linesize,
125  19, 19,
126  src_x - 1, src_y - 1,
127  s->h_edge_pos, s->v_edge_pos);
128  ptr= s->edge_emu_buffer + 1 + s->linesize;
129  emu=1;
130  }
131 
132  s->dsp.put_mspel_pixels_tab[dxy](dest_y , ptr , linesize);
133  s->dsp.put_mspel_pixels_tab[dxy](dest_y+8 , ptr+8 , linesize);
134  s->dsp.put_mspel_pixels_tab[dxy](dest_y +8*linesize, ptr +8*linesize, linesize);
135  s->dsp.put_mspel_pixels_tab[dxy](dest_y+8+8*linesize, ptr+8+8*linesize, linesize);
136 
137  if(s->flags&CODEC_FLAG_GRAY) return;
138 
139  if (s->out_format == FMT_H263) {
140  dxy = 0;
141  if ((motion_x & 3) != 0)
142  dxy |= 1;
143  if ((motion_y & 3) != 0)
144  dxy |= 2;
145  mx = motion_x >> 2;
146  my = motion_y >> 2;
147  } else {
148  mx = motion_x / 2;
149  my = motion_y / 2;
150  dxy = ((my & 1) << 1) | (mx & 1);
151  mx >>= 1;
152  my >>= 1;
153  }
154 
155  src_x = s->mb_x * 8 + mx;
156  src_y = s->mb_y * 8 + my;
157  src_x = av_clip(src_x, -8, s->width >> 1);
158  if (src_x == (s->width >> 1))
159  dxy &= ~1;
160  src_y = av_clip(src_y, -8, s->height >> 1);
161  if (src_y == (s->height >> 1))
162  dxy &= ~2;
163  offset = (src_y * uvlinesize) + src_x;
164  ptr = ref_picture[1] + offset;
165  if(emu){
166  s->vdsp.emulated_edge_mc(s->edge_emu_buffer, ptr,
167  s->uvlinesize, s->uvlinesize,
168  9, 9,
169  src_x, src_y,
170  s->h_edge_pos >> 1, s->v_edge_pos >> 1);
171  ptr= s->edge_emu_buffer;
172  }
173  pix_op[1][dxy](dest_cb, ptr, uvlinesize, h >> 1);
174 
175  ptr = ref_picture[2] + offset;
176  if(emu){
177  s->vdsp.emulated_edge_mc(s->edge_emu_buffer, ptr,
178  s->uvlinesize, s->uvlinesize,
179  9, 9,
180  src_x, src_y,
181  s->h_edge_pos >> 1, s->v_edge_pos >> 1);
182  ptr= s->edge_emu_buffer;
183  }
184  pix_op[1][dxy](dest_cr, ptr, uvlinesize, h >> 1);
185 }
Generated on Sun Mar 23 2014 23:50:06 for FFmpeg by   doxygen 1.8.2