FFmpeg
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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 
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 }
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